Underlined papers can be downloaded as PDF-files.

- K.A. Schouhamer Immink and J.H. Weber,
'Minimum Pearson distance detection in the presence of low-frequency colored noise and interference', Submitted to
*IEEE Trans. on Communications,*March 2021.**Abstract**- Communications systems can be hampered by unwanted low-frequency signals of unknown amplitude and frequency added to the sent signal. Traditionally, high-pass filtering and/or balanced codes have been applied in order to attenuate the effects of spurious low-frequency disturbances. High-pass filtering may lead to inter-symbol interference, which, in turn, may lead to a serious degradation of the error performance, and balanced codes are expensive in terms of required redundancy. We investigate and present alternative coding and detection methods for the channel hampered by additive low-frequency colored noise or jamming signals of unknown amplitude and frequency. We show that Pearson-distance-based detection instead of prior art Euclidean-distance-based detection may significantly improve the error performance when the channel is perturbed by slowly varying disturbances of unknown amplitude and wave shape. - T.T. Nguyen, K. Cai, and K.A. Schouhamer Immink,
'Efficient Design of Subblock Energy-Constrained Codes and Sliding Window-Constrained Codes', Submitted to
*IEEE Trans. on Inform. Theory,*July 2020.**Abstract**- The subblock energy-constrained codes (SECCs) and sliding window-constrained codes (SWCCs) have recently attracted attention due to various applications in communication systems such as simultaneous energy and information transfer. In a SECC, each codeword is divided into smaller non-overlapping windows, called subblocks, and every subblock is constrained to carry sufficient energy. In an SWCC, however, the energy constraint is enforced over every window. In this work, we focus on the binary channel, where sufficient energy is achieved theoretically by using relatively high weight codes, and study SECCs and SWCCs under more general constraints, namely bounded SECCs and bounded SWCCs. We propose two methods to construct such codes with low redundancy and linear-time complexity, based on Knuth’s balancing technique and sequence replacement technique. These methods can be further extended to construct SECCs and SWCCs. For certain codes parameters, our methods incur only one redundant bit. We also impose the minimum distance constraint for error correction capability of the designed codes, which helps to reduce the error propagation during decoding as well. - T.T. Nguyen, K. Cai, K. A. Schouhamer Immink, Y. M. Chee, 'Efficient Design of Capacity-Approaching Two-Dimensional Weight-Constrained Codes',
IEEE International Symposium on Information Theory, (ISIT) 2021, Melbourne, June 2021.
**Abstract**- In this work, given n, p > 0, efficient encoding/decoding algorithms are presented for mapping arbitrary data to and from n x n binary arrays in which the weight of every row and every column is at most pn. Such constraint, referred as p-bounded-weight- constraint, is crucial for reducing the parasitic currents in the crossbar resistive memory arrays, and has also been proposed for certain applications in the area of holographic memory in optical storage. While low-complexity designs have been proposed in the literature for only the case p = 1/2, this work provides an efficient coding scheme that works for arbitrary values of p. The coding rate of our proposed encoder approaches the channel capacity for all p, particularly when p = 1/2, we are able to reduce the redundancy of the best known encoder in the literature by at leasttheta(n) bits.**Articles, books, and book chapters (most recent first).**

**==2021==**

- K.A. Schouhamer Immink and K. Cai,
'Spectral Shaping Codes',
*IEEE Trans. on Consumer Electronics,*vol. CE-67, no. 2, pp. 158-165, May 2021, doi 10.1109/TCE.2021.3073199.**Abstract**- We investigate a new approach for designing spectral shaping block codes with a target spectrum, H_t(f), that has been specified at a plurality of frequencies. We analyze the probability density function of the spectral power density function of uncoded n-symbol bipolar codewords. We present estimates of the redundancy and the spectrum of spectral shaping codes with specified target spectral densities H_t(f_i) at frequencies f_i. Constructions of low-redundancy codes with suppressed low-frequency content are presented that compare favorably with conventional dc-balanced codes currently used in data transmission and data storage devices with applications in consumer electronics.

- T.T. Nguyen, K. Cai, K.A. Schouhamer Immink, and H.M. Kiah,
'Capacity-Approaching Constrained Codes with Error Correction for DNA-Based Data Storage',
*IEEE Trans. on Inform. Theory,*March 2021, doi 10.1109/TIT.2021.3066430.**Abstract**- We propose coding techniques that simultaneously limit the length of homopolymer runs, ensure the GC-content constraint, and are capable of correcting a single edit error in strands of nucleotides in DNA-based data storage systems. In particular, for given l, eps>0, we propose simple and efficient encoders/decoders that transform binary sequences into DNA base sequences(codewords), namely sequences of the symbols A, T, C, and G, that satisfy all of the following properties: Runlength constraint: the maximum homopolymer run in each codeword is at most l, GC-content constraint: the GC-content of each codeword is within[0.5-eps,0.5 +eps], Error-correction: each codeword is capable of correcting a single deletion, or single insertion, or single substitution error. While various combinations of these properties have been considered in the literature, this work provides generalizations of codesconstructions that satisfy all the properties with arbitrary parameters of`and. Furthermore, for practical values of`and, we show that our encoders achieve higher rates than existing results in the literature and approach capacity. Our methods have low encoding/decoding complexity and limited error propagation.

- R. Bu, J.H. Weber, and K.A. Schouhamer Immink,
'Maximum Likelihood Decoding for Channels with Gaussian Noise and Signal Dependent Offset,
*IEEE Trans. on Commun.,*vol. COM-69, no. 1, pp. 85-93, Jan. 2021, doiI 10.1109/TCOMM.2020.3026383**Abstract**- In many channels, the transmitted signals do not only face noise, but offset mismatch as well. In the prior art, maximum likelihood (ML) decision criteria have already been developed for noisy channels suffering from signal independent offset . In this paper, such ML criterion is considered for the case of binary signals suffering from Gaussian noise and signal dependent offset . The signal dependency of the offset signifies that it may differ for distinct signal levels, i.e., the offset experienced by the zeroes in a transmitted codeword is not necessarily the same as the offset for the ones. Besides the ML criterion itself, also an option to reduce the complexity is considered. Further, a brief performance analysis is provided, confirming the superiority of the newly developed ML decoder over classical decoders based on the Euclidean or Pearson distances.

**==2020==** - K.A. Schouhamer Immink and K. Cai,
'Block Codes for Energy-Harvesting Sliding-Window Constrained Channels',
*IEEE Communications Letters,*vol. 24, no. 11, pp. 2383-2386, Nov. 2020, doi 10.1109/LCOMM.2020.3012301.**Abstract**- Energy-harvesting sliding-window constrained block codes guarantee that within any prescribed window of l consecutive bits the constrained sequence has at least t, t=1, 1’s. Prior art code design methods build upon the finite-state machine description of the (l,t) constraint, but as the number of states equals l choose t, a code design becomes prohibitively complex for mounting l and t. We present a new block code construction that circumvents the enumeration of codewords using a finite-state description of the (l,t)-constraint. The codewords of the block code are encoded and decoded using a single look-up table. For (l=4,t=2), the new block codes are maximal, that is, they have the largest possible number of codewords for its parameters.

- W. Song, K. Cai, and K.A. Schouhamer Immink,
'Sequence-Subset Distance and Coding for Error Control in DNA-based Data Storage',
*IEEE Trans. on Inform. Theory,*vol. IT-66, no. 10, pp. 6048-6065, Oct. 2020, doi 10.1109/TIT.2020.3002611.**Abstract**- The process of DNA-based data storage (DNA storage for short) can be mathematically modelled as a communication channel, termed DNA storage channel, whose inputs and outputs are sets of unordered sequences. To design error correcting codes for DNA storage channel, a new metric, termed the sequence-subset distance, is introduced, which generalizes the Hamming distance to a distance function defined between any two sets of unordered vectors and helps to establish a uniform framework to design error correcting codes for DNA storage channel. We further introduce a family of error correcting codes, referred to as sequence-subset codes, for DNA storage and show that the error-correcting ability of such codes is completely determined by their minimum distance. We derive some upper bounds on the size of the sequence-subset codes including a tight bound for a special case, a Singleton-like bound and a Plotkin-like bound. We also propose some constructions, including an optimal construction for that special case, which imply lower bounds on the size of such codes. - R. Bu, J.H. Weber, and K.A. Schouhamer Immink,
'Maximum Likelihood Decoding for Channels with Uniform Noise and Signal Dependent Offset', pp. 706-710,
IEEE International Symposium on Information Theory, (ISIT) 2020, San Francisco, June 2020, doi: 10.1109/ISIT44484.2020.9174270.
**Abstract**- Maximum likelihood (ML) decision criteria have been developed for channels suffering from signal independent offset mismatch. Here, such criteria are considered for signal dependent offset, which means that the value of the offset may differ for distinct signal levels rather than being the same for all levels. An ML decision criterion is derived, assuming uniform distributions for both the noise and the offset. In particular, for the proposed ML decoder, bounds are determined on the standard deviations of the noise and the offset which lead to a word error rate equal to zero. Simulation results are presented confirming the findings. - T.T. Nguyen, K. Cai, K.A. Schouhamer Immink, and H.M. Kiah,
'Constrained Codes with Error Correction for DNA-Based Data Storage', pp. 694-699,
IEEE International Symposium on Information Theory, (ISIT) 2020, San Francisco, June 2020d, doi: 10.1109/ISIT44484.2020.9174438.
In this paper, we first propose coding techniques for DNA-based data storage which account the maximum homopolymer runlength and the GC-content.
**Abstract**- In particular, for arbitrary l,e>0, we propose simple and efficient (l,e)-constrained encoders that transform binary sequences into DNA base sequences (codewords), that satisfy the following properties: · Runlength constraint: the maximum homopolymer run in each codeword is at most l, · GC-content constraint: the GC-content of each codeword is within [0.5-e, 0.5+e]. For practical values of l and e, our codes achieve higher rates than the existing results in the literature. We further design efficient (l, e)-constrained codes with error-correction capability. Specifically, the designed codes satisfy the runlength constraint, the GC-content constraint, and can correct a single edit (i.e. a single deletion, insertion, or substitution) and its variants. To the best of our knowledge, no such codes are constructed prior to this work. - T.T. Nguyen, K. Cai, K.A. Schouhamer Immink,
'Binary Subblock Energy-Constrained Codes: Knuth’s Balancing and Sequence Replacement Techniques', pp. 37-41,
IEEE International Symposium on Information Theory, (ISIT) 2020, San Francisco, June 2020, doi: 10.1109/ISIT44484.2020.9174430.
**Abstract**- The subblock energy-constrained codes (SECCs) have recently attracted attention due to various applications in communication systems such as simultaneous energy and information transfer. In a SECC, each codeword is divided into smaller subblocks, and every subblock is constrained to carry sufficient energy. In this work, we study SECCs under more general constraints, namely bounded SECCs and sliding-window constrained codes (SWCCs), and propose two methods to construct such codes with low redundancy and linear-time complexity, based on Knuth’s balancing technique and sequence replacement technique. For certain codes parameters, our methods incur only one redundant bit. - K.A. Schouhamer Immink and K. Cai,
'Properties and constructions of energy-harvesting sliding-window constrained codes',
*IEEE Communications Letters,*vol. 24, nr. 9, 1890-1893, Sept. 2020, doi: 10.1109/LCOMM.2020.2993467.**Abstract**- We study properties and constructions of constrained binary codes that enable simultaneous energy and information transfer. We specifically study sliding-window constrained codes that guarantee that within any prescribed window of l consecutive bits the constrained sequence has at least t, t > 1, 1's. We present a K-state source, K = l choose t, that models the (l, t) sliding-window constraint. We compute the information capacity of sliding-window (l, t)-constrained sequences. We design efficient coding techniques for translating source data into sliding-window (l, t)-constrained sequences. - J.H. Weber, R. Bu, K. Cai, and K.A. Schouhamer Immink,
'Binary Block Codes for Noisy Channels with Unknown Offset',
*IEEE Trans. on Commun.,**IEEE Trans. on Commun.,*vol. 68, Issue 7, pp. 3975-3983, July 2020, doi: 10.1109/TCOMM.2020.2986200.**Abstract**- Decoders minimizing the Euclidean distance between the received word and the candidate codewords are known to be optimal for channels suffering from Gaussian noise. However, when the stored or transmitted signals are also corrupted by an unknown offset, other decoders may perform better. In particular, applying the Euclidean distance on normalized words makes the decoding result independent of the offset. The use of this distance measure calls for alternative code design criteria in order to get good performance in the presence of both noise and offset. In this context, various adapted versions of classical binary block codes are proposed, such as (i) cosets of linear codes, (ii) (unions of) constant weight codes, and (iii) unordered codes. It is shown that considerable performance improvements can be achieved, particularly when the offset is large compared to the noise. - K.A. Schouhamer Immink and K. Cai,
'Properties and constructions of constrained codes for DNA-based data storage',
*IEEE Access,*vol. 8, pp. 49523-49531, 2020, doi: 10.1109/ACCESS.2020.2980036.**Abstract**- We describe properties and constructions of constraint-based codes for DNA-based data storage which account for the maximum repetition length and AT/GC balance. Generating functions and approximations are presented for computing the number of sequences with maximum repetition length and AT/GC balance constraint. We describe routines for translating binary runlength limited and/or balanced strings into DNA strands, and compute the efficiency of such routines. Expressions for the redundancy of codes that account for both the maximum repetition length and AT/GC balance are derived. - K.A. Schouhamer Immink, Jan M. Romijn (1932-2020) Obituary, Journal of the Audio Engineering Society, vol. 68, nr. 9, pp. 687-687, 2020.
- K.A. Schouhamer Immink and K. Cai,
'Dynamic Threshold Detection Using Clustering in the Presence of Channel Mismatch and Additive Noise',
*IEEE Access,*vol. 8, pp. 19319-19326, 2020, doi: 10.1109/ACCESS.2020.2980036.**Abstract**- We report on the feasibility of k-means clustering techniques for the dynamic threshold detection of encoded q-ary symbols transmitted over a noisy channel with partially unknown channel parameters. We first assess the performance of k-means clustering technique without dedicated constrained coding. We apply constrained codes which allows a wider range of channel uncertainties so improving the detection reliability. - T.T. Nguyen, K. Cai, K.A. Schouhamer Immink, and H.M. Kiah,
'Capacity-Approaching Constrained Codes with Error Correction for DNA-Based Data Storage', ArXiv:2001.02839, Jan. 2020.
**Abstract**- We propose coding techniques that limit the length of homopolymers runs, ensure the GC-content constraint, and are capable of correcting a single edit error in strands of nucleotides in DNA-based data storage systems. In particular, for given ell, epsilon>0, we propose simple and efficient encoders/decoders that transform binary sequences into DNA base sequences (codewords), namely sequences of the symbols A, T, C and G, that satisfy the following properties: (i) Runlength constraint: the maximum homopolymer run in each codeword is at most ell, (ii) GC-content constraint: the GC-content of each codeword is within [0.5-epsilon, 0.5+epsilon], (iii) Error-correction: each codeword is capable of correcting a single deletion, or single insertion, or single substitution error. For practical values of ell and epsilon, we show that our encoders achieve much higher rates than existing results in the literature and approach the capacity. Our methods have low encoding/decoding complexity and limited error propagation.**==2019==** - K.A. Schouhamer Immink,
'A New DC-free Runlength Limited Coding Method for Data Transmission and Recording',
*IEEE Trans. on Consumer Electronics,*vol. 65, Issue 4, pp. 502-505, Nov. 2019, doi: 10.1109/TCE.2019.2932795**Abstract**- This paper describes a new coding method based on binary (d, k) runlength constraints used for recording or transmitting an audio or video signal, computer data, etc. Data words of m bits are translated into codewords of n bits using a conversion table. The codewords satisfy a (d, k) runlength constraint in which at least d and not more than k '0's occur between consecutive '1's. The n-bit codewords alternate with p-bit merging words which in the prior art are selected such that the d and k are satisfied at the borders of consecutive codewords. We present a new coding method, where the codewords obey the (d, k)-constraint, but the merging words are not required to obey the (d)-constraint. The merging word that satisfies said conditions, yielding the lowest low-frequency spectral content of the encoded signal obtained after modulo-2 integration, is selected. The spectral performance of the new coding method has been appraised by computer simulations for the EFM (Eight-to-Fourteen Modulation) parameters, d = 2, k = 10, and p = 3. The low-frequency content of the signal generated by the newly presented coding method is around 4 dB lower in the relevant low-frequency range than that generated by the conventional EFM method. - K.A. Schouhamer Immink and K. Cai,
'Efficient balanced and maximum homopolymer-run restricted block codes for DNA-based data storage',
*IEEE Communications Letters,*vol. 23, Issue 10, pp. 1676-1679, Oct. 2019, doi: 10.1109/LCOMM.2019.2930970**Abstract**- We analyze codes for DNA-based data storage which accounts for the maximum homopolymer repetition length and GC-AT balance. We present a new precoding method for translating words with a maximum run of k zeros into words with a maximum homopolymer run m = k + 1, which is atractive for securing GC-AT balance. Generating functions are presented for enumerating the number of n-symbol k-constrained codewords of given GC-AT balance Various efficient constructions are presented of block codes that satisfy a combined balance and maximum homopolymer run. - K.A. Schouhamer Immink and K. Cai,
'Properties and constructions of constrained codes for DNA-based data storage', arXiv:1812.06798, 2019.
**Abstract**- We describe properties and constructions of constraint-based codes for DNA-based data storage which accounts for the maximum repetition length and AT balance. We present algorithms for computing the number of sequences with maximum repetition length and AT balance constraint. We present efficient routines for translating binary runlength limited and/or balanced strings into DNA strands. We show that the implementation of AT-balanced codes is straightforwardly accomplished with binary balanced codes. We present codes that accounts for both the maximum repetition length and AT balance. - K.A. Schouhamer Immink and K. Cai,
'Computation of the spectrum of dc^2-balanced codes',
*IEEE Trans. on Commun.,*vol. 67, no. 7, pp. 4634-4640, July 2019, doi: 10.1109/TCOMM.2019.2911583**Abstract**- We apply the central limit theorem for deriving approximations to the auto-correlation function and power density function (spectrum) of second-order spectral null (dc^2-balanced) codes. We show that the auto-correlation function of dc^2-balanced codes can be accurately approximated by a cubic function. We compare the approximate auto-correlation function and spectrum with the exact auto-correlation function and spectrum of full set dc^2-balanced codes. We show that the difference between the approximate and exact spectrum is less than 0.04 dB for codeword length n = 256. We compare the spectral performance of dc-balanced versus dc^2-balanced codes in the low-frequency range. - W. Song, K. Cai, and K.A. Schouhamer Immink,
'Sequence-Subset Distance and Coding for Error Control in DNA-based Data Storage',
IEEE International Symposium on Information Theory (ISIT), Paris, France, July 2019.
**Abstract**- The process of DNA data storage can be mathematically modelled as a communication channel, termed DNA storage channel, whose inputs and outputs are sets of unordered sequences. To design error correcting codes for DNA storage channel, a new metric, termed the sequence-subset distance, is introduced, which generalizes the Hamming distance to a distance function defined between any two sets of unordered vectors and helps to establish a uniform framework to design error correcting codes for DNA storage channel. We further introduce a family of error correcting codes, termed sequence subset codes, for DNA storage and show that the error-correcting ability of such codes is completely determined by their minimum distance. We derived some upper bounds on the size of the sequence subset codes including a Singleton-like bound and a Plotkin-like bound. We also propose some constructions, which imply lower bounds on the size of such codes. - K.A. Schouhamer Immink and K. Cai,
'Estimated Spectra of Higher-Order Spectral Null Codes',
*IEEE Communications Letters,*vol. 23, pp. 20-23, Jan. 2019, doi: 10.1109/LCOMM.2018.2877324.**Abstract**- We present an estimate of the power density function (spectrum) of binary K-th order spectral null codes. We work out the auto-correlation model in detail for second-and third-order spectral null codes. We compare the auto-correlation functions and spectra predicted by the model with those generated by full-set K-th order spectral null block codes.**==2018==** - K.A. Schouhamer Immink and K. Cai,
'An Unsupervised Learning Approach for Data Detection in the Presence of Channel Mismatch and Additive Noise',
arXiv:1812.09024, Oct. 2018.
**Abstract**- We investigate machine learning based on clustering techniques that are suitable for the detection of encoded strings of q-ary symbols transmitted over a noisy channel with partially unknown characteristics. We consider the detection of the q-ary data as a classification problem, where objects are recognized from a corrupted vector, which is obtained by an unknown corruption process. We first evaluate the error performance of k-means clustering technique without constrained coding. Secondly, we apply constrained codes that create an environment that improves the detection reliability and it allows a wider range of channel uncertainties. - K. Cai and K.A. Schouhamer Immink,
'Detection of Noisy and Corrupted Data Using Clustering Techniques',
International Symposium on Information Theory and it Applications (ISITA), Singapore, October 28-31, 2018, doi: 10.23919/ISITA.2018.8664325.
**Abstract**- We investigate machine learning based on clustering techniques that are suitable for the detection of n-symbol words of q-ary symbols transmitted over a noisy channel with partially unknown characteristics. We consider the detection of the n-symbol q-ary data as a classification problem, where objects are recognized from a corrupted vector, which is obtained by an unknown corruption process. - J.H. Weber and K.A. Schouhamer Immink,
'Properties of Binary Pearson Codes',
International Symposium on Information Theory and it Applications (ISITA), Singapore, October 28-31, 2018, doi: 10.23919/ISITA.2018.8664287.
**Abstract**- We consider the transmission and storage of data that use coded symbols over a channel, where a Pearson-distance based detector is used for achieving resilience against unknown channel gain and offset, and corruption with additive noise. We discuss properties of binary Pearson codes, such as the Pearson noise distance that plays a key role in the error performance of Pearson-distance-based detection. We also compare the Pearson noise distance to the well-known Hamming distance, since the latter plays a similar role in the error performance of Euclidean distance- based detection. - M. Zhang, K. Cai and K.A. Schouhamer Immink,
'Soft-Decision Decoding for DNA-Based Data Storage',
International Symposium on Information Theory and it Applications (ISITA), pp. 16-20, Singapore, October 28-31, 2018, doi: 10.23919/ISITA.2018.8664305.
**Abstract**- This paper presents novel soft-decision decoding (SDD) of error correction codes (ECCs) that substantially improve the reliability of DNA-based data storage system compared with conventional hard-decision decoding (HDD). We propose a simplified system model for DNA-based data storage according to the major characteristics and different types of errors associated with the prevailing DNA synthesis and sequencing technologies. We compute analytically the error-free probability of each sequenced DNA oligo nucleotide (oligo), based on which the soft-decision log-likelihood ratio (LLR) of each oligo can be derived. We apply the proposed SDD algorithms to the DNA Fountain scheme which achieves the highest information density so far in the literature. Simulation results show that SDD achieves an error rate improvement of two to three orders of magnitude over HDD, thus demonstrating its potential to improve the information density of DNA-based data storage systems. - K.A. Schouhamer Immink,
'How we made the compact disc',
*Nature Electronics,*vol. 1, Issue 4, pp. 260, April 2018. doi: 10.1038/s41928-018-0063-7.**Abstract**- An international collaboration between Philips and the Sony Corporation lead to the creation of the compact disc. Kees A. Schouhamer Immink explains how it came about. - J.H. Weber and K.A. Schouhamer Immink,
'Maximum Likelihood Decoding for Gaussian Noise Channels with Gain or Offset
Mismatch',
*IEEE Communications Letters,*vol. 22, Issue 6, pp. 1128-1131, June 2018, doi: 10.1109/LCOMM.2018.2809749.**Abstract**- Besides the omnipresent noise, other important inconveniences in communication and storage systems are formed by gain and/or offset mismatches. In the prior art, a maximum likelihood (ML) decision criterion has already been developed for Gaussian noise channels suffering from unknown gain and offset mismatches. Here, such criteria are considered for Gaussian noise channels suffering from either an unknown offset or an unknown gain. Furthermore, ML decision criteria are derived when assuming a Gaussian or uniform distribution for the offset in the absence of gain mismatch. - K.A. Schouhamer Immink, K. Cai, and J.H. Weber,
'Dynamic Threshold Detection Based on Pearson Distance Detection',
*IEEE Trans. on Communications,*vol. 66, Issue 7, pp. 2958-2965, 2018, doi: 10.1109/TCOMM.2018.2814618.**Abstract**- We consider the transmission and storage of encoded strings of symbols over a noisy channel, where dynamic threshold detection is proposed for achieving resilience against unknown scaling and offset of the received signal. We derive simple rules for dynamically estimating the unknown scale (gain) and offset. The estimates of the actual gain and offset so obtained are used to adjust the threshold levels or to re-scale the received signal within its regular range. Then, the re-scaled signal, brought into its standard range, can be forwarded to the final detection/decoding system, where optimum use can be made of the distance properties of the code by applying, for example, the Chase algorithm. A worked example of a spin-torque transfer magnetic random access memory (STT-MRAM) with an application to an extended (72, 64) Hamming code is described, where the retrieved signal is perturbed by additive Gaussian noise and unknown gain or offset. - T.G.Swart, J.H. Weber, and K.A. Schouhamer Immink,
'Prefixless q-ary Balanced Codes with Fast Syndrome-based Error Correction',
*IEEE Trans. on Information Theory,*vol. 64, Issue 4, pp. 2431-2443, April 2018, doi: 10.1109/TIT.2017.2767034.**Abstract**- We investigate a Knuth-like scheme for balancing q-ary codewords, which has the virtue that look-up tables for coding and decoding the prefix are avoided by using precoding and error correction techniques. We show how the scheme can be extended to allow for error correction of single channel errors using a fast decoding algorithm that depends on syndromes only, making it considerably faster compared to the prior art exhaustive decoding strategy. A comparison between the new and prior art schemes, both in terms of redundancy and error performance, completes the study. - K.A. Schouhamer Immink and K. Cai,
'Design of Capacity-Approaching Constrained Codes for DNA-based Storage Systems',
*IEEE Communications Letters,*vol. 22, pp. 224-227, Feb. 2018, doi: 10.1109/LCOMM.2017.2775608.**Abstract**- We consider coding techniques that limit the lengths of homopolymer runs in strands of nucleotides used in DNA-based mass data storage systems. We compute the maximum number of user bits that can be stored per nucleotide when a maximum homopolymer runlength constraint is imposed. We describe simple and efficient implementations of coding techniques that avoid the occurrence of long homopolymers, and the rates of the constructed codes are close to the theoretical maximum. The proposed sequence replacement method for k-constrained q-ary data yields a significant improvement in coding redundancy than the prior art sequence replacement method for the k-constrained binary data. Using a simple transformation, standard binary maximum runlength limited sequences can be transformed into maximum runlength limited q-ary sequences which opens the door to applying the vast prior art binary code constructions to DNA-based storage. - K. Cai, K.A. Schouhamer Immink, M. Zhang, and R. Zhao,
'Design of Spectrum Shaping Codes for High-Density Data Storage',
ICCE, Las Vegas, pp. 1-2, Jan. 2018, doi: 10.1109/ICCE.2018.8326206.
**Abstract**- This paper proposes systematic code design methods for constructing efficient spectrum shaping codes with the maximum runlength limited constraint k, which are widely used in data storage systems for digital consumer electronics products. Through shaping the spectrum of the input user data sequence, the codes can effectively circumvent the interaction between the data signal and servo signal in high-density data storage systems. In particular, we first propose novel methods to design high-rate k constrained codes in the non-return-to-zero (NRZ) format, which can not only facilitate timing recovery of the storage system, but also avoid error propagation during decoding and reduce the system complexity. We further propose to combine the Guided Scrambling (GS) technique with the k constrained code design methods to construct highly efficient spectrum shaping k constrained codes. Simulation results demonstrate that the designed codes can achieve significant spectrum shaping effect with only around 1% code rate loss and reasonable computational complexity. - K.A. Schouhamer Immink and K. Cai,
'Composition Check Codes',
*IEEE Trans. on Inform. Theory,*vol. 64, Issue 1, pp. 249-256, Jan. 2018, doi: 10.1109/TIT.2017.2721423.**Abstract**- We present composition check codes for noisy storage and transmission channels with unknown gain and/or offset. In the proposed composition check code, like in systematic error correcting codes, the encoding of the main data into a constant composition code is completely avoided. To the main data, a coded label is appended that carries information regarding the composition vector of the main data. Slepian's optimal detection technique of codewords that are taken from a constant composition code is applied for detection. A first Slepian detector detects the label and subsequently restores the composition vector of the main data. The composition vector, in turn, is used by a second Slepian detector to optimally detect the main data. We compute the redundancy and error performance of the new method, and results of computer simulations are presented.**==2017==** - K. Cai, K.A. Schouhamer Immink, M. Zhang, and R. Zhao,
'On the design of Spectrum Shaping Codes for High-Density Data Storage',
*Trans. on Consumer Electronics*, vol. CE-63, pp. 477-482, Nov. 2017, doi: 10.1109/TCE.2017.015067.**Abstract**- This paper proposes systematic code design methods for constructing efficient spectrum shaping codes with the maximum runlength limited constraint k, which are widely used in data storage systems for digital consumer electronics products. Through shaping the spectrum of the input user data sequence, the codes can effectively circumvent the interaction between the data signal and servo signal in high-density data storage systems. In particular, we first propose novel methods to design high-rate k constrained codes in the non-return-to-zero (NRZ) format, which can not only facilitate timing recovery of the storage system, but also avoid error propagation during decoding and reduce the system complexity. We further propose to combine the Guided Scrambling (GS) technique with the k constrained code design methods to construct highly efficient spectrum shaping k constrained codes. Simulation results demonstrate that the designed codes can achieve significant spectrum shaping effect with only around 1% code rate loss and reasonable computational complexity. - K. Cai and K.A. Schouhamer Immink,
'Cascaded Channel Model, Analysis, and Hybrid Decoding for Spin-Torque Transfer Magnetic Random Access Memory (STT-MRAM)',
*IEEE Trans. on Magnetics,*vol. 53, Issue 11, pp. 1-11, Nov. 2017, doi: 10.1109/TMAG.2017.2711245.**Abstract**- Spin-torque transfer magnetic random access memory (STT-MRAM) is a promising non-volatile memory technology widely considered to replace dynamic random access memory (DRAM). However, there still exist critical technical challenges to be tackled. For example, process variation and thermal fluctuation may lead to both write errors and read errors, severely affecting the reliability of the memory array. In this paper, we first propose a novel cascaded channel model for STT-MRAM that facilitates fast error rate simulations and more importantly the theoretical design and analysis of memory sensing and channel coding schemes. We analyze the raw bit error rate and probabilities of dominant error events, and derive the maximum likelihood decision criterion and the log-likelihood ratio of the cascaded channel. Based on these works, we further propose a two-stage hybrid decoding algorithm for extended Hamming codes for STT-MRAM. Simulation results demonstrate the effectiveness of the proposed hybrid decoding algorithm for improving the reliability of STT-MRAM in the presence of both write errors and read errors and supporting its potential applications, such as replacing DRAM. - K. Cai and K.A. Schouhamer Immink, 'A Cascaded Channel Model and Hybrid Decoding for Spin-Torque Transfer Magnetic Random Access Memory (STT-MRAM)',
Proceedings IEEE Intermag, Dublin, April 2017, doi: 10.1109/INTMAG.2017.8008051.
- K.A. Schouhamer Immink,
'Progress in Constrained Codes', Proceedings of Workshop AEW10: Concepts in Information Theory and Communications, Boppard, June 2017.
**==2016==** - K.A. Schouhamer Immink and V. Skachek,
'Minimum Pearson Distance Detection Using Mass-Centered
Codewords in the Presence of Unknown Varying Offset',
*IEEE Journal on Selected Areas of Communications, Special Issue on Signal Processing and Coding for Digital Storage,*vol. 34, pp. 2510-2517, Sept. 2016, doi: 10.1109/JSAC.2016.2603618.**Abstract**- We consider the transmission and storage of data that use coded binary symbols over a channel, where a Pearson distance-based detector is used for achieving resilience against additive noise, unknown channel gain, and varying offset. We study minimum Pearson distance (MPD) detection in conjunction with a set, S, of codewords satisfying a center-of-mass constraint. We investigate the properties of the codewords in S, compute the size of S, and derive its redundancy for asymptotically large values of the codeword length n. The redundancy of S is approximately (3/2) log 2 n + a, where a = log 2 (p/24) 1/2 = -1.467.. for n odd and a = -0.467.. for n even. We describe a simple encoding algorithm whose redundancy equals 2 log 2 n+ o(logn). We also compute the word error rate of the MPD detector when the channel is corrupted with additive Gaussian noise. - J. H. Weber, T. G. Swart, and K.A. Schouhamer Immink,
'Simple Systematic Pearson Coding',
IEEE International Symposium on Information Theory, Barcelona, Spain, pp. 385-389, July 2016.
- V. Skachek and K.A. Schouhamer Immink,
'Minimum Pearson Distance Detection in the Presence of Unknown Slowly Varying Offset',
IEEE International Symposium on Information Theory, Barcelona, Spain, pp. 195-199, July 2016. doi: 10.1109/ISIT.2016.7541288.
- K.A. Schouhamer Immink,
'Low-complexity Near-optimal Detection of Dc^2-Balanced Codes',
*IET Electronics Letters,*vol. 52, no. 9, pp. 719-720, April 2016. doi: 10.1049/el.2015.3933. - J.H. Weber, K.A. Schouhamer Immink, and S. Blackburn,
'Pearson Codes',
*IEEE Trans. on Information Theory,*vol. 62, no. 1, pp. 131-135, Jan. 2016. doi: 10.1109/TIT.2015.2490219.**Abstract**- The Pearson distance has been advocated for improving the error performance of noisy channels with unknown gain and offset. The Pearson distance can only fruitfully be used for sets of q-ary codewords, called Pearson codes, that satisfy specific properties. We will analyze constructions and properties of optimal Pearson codes. We will compare the redundancy of optimal Pearson codes with the redundancy of prior art T-constrained codes, which consist of q-ary sequences in which T pre-determined reference symbols appear at least once. In particular, it will be shown that for q = 3, the two-constrained codes are optimal Pearson codes, while for q = 4 these codes are not optimal.**==2015==** - K.A. Schouhamer Immink and J.H. Weber,
'Hybrid Minimum Pearson and Euclidean Distance Detection',
*IEEE Trans. on Communications,*vol. 63, pp. 3290-3298, 2015, doi: 10.1109/TCOMM.2015.2458319.**Abstract**- The reliability of mass storage systems, such as optical data recording and non-volatile memory (Flash), is seriously hampered by uncertainty of the actual value of the offset (drift) or gain (amplitude) of the retrieved signal. The recently introduced minimum Pearson distance detection is immune to unknown offset or gain, but this virtue comes at the cost of a lessened noise margin at nominal channel conditions. We will present a novel hybrid detection method, where we combine the outputs of the minimum Euclidean distance and Pearson distance detectors so that we may trade detection robustness versus noise margin. We will compute the error performance of hybrid detection in the presence of unknown channel mismatch and additive noise. - K.A. Schouhamer Immink and J.H. Weber,
'How to deal with channels with gain and offset mismatch?',
Ninth Asian-European Workshop on Information Theory (AEW9), Matsuyama, Japan, 27-29 May 2015.
- K.A. Schouhamer Immink and J.H. Weber,
'Detection in the Presence of Additive Noise and Unknown Offset', pp. 2028-2032, IEEE ICC2015, London, UK, 2015.
- F. Sala, K.A. Schouhamer Immink, and L. Dolecek,
'Error Control Schemes for Modern Flash Memories:
Solutions for Flash deficiencies',
*IEEE Consumer Electronics Magazine,*pp. 66-73, Jan. 2015. doi: 10.1109/MCE.2014.2360965.**Abstract**- Flash, already one of the dominant forms of data storage for mobile consumer devices, such as smartphones and media players, is experiencing explosive growth in cloud and enterprise applications. Flash devices offer very high access speeds, low power consumption, and physical resiliency. Our goal in this article is to provide a high-level overview of error correction for Flash. We will begin by discussing Flash functionality and design. We will introduce the nature of Flash deficiencies. Afterwards, we describe the basics of ECCs. We discuss BCH and LDPC codes in particular and wrap up the article with more directions for Flash coding.**==2014==** - K.A. Schouhamer Immink, 'The Story of the Compact Disc... and Beethoven’s role in the specifications!',
*IEEE Consumer Electronics Magazine,*vol. 3, no. 4, pp. 24-30, Oct. 2014, doi: 10.1109/MCE.2014.2338571. - K.A. Schouhamer Immink and J.H. Weber,
'Minimum Pearson Distance Detection for Multi-Level Channels
with Gain and/or Offset Mismatch',
*IEEE Trans. on Information Theory,*vol. 60, pp. 5966-5974, Oct. 2014. doi: 10.1109/TIT.2014.2342744.**Abstract**- The performance of certain transmission and storage channels, such as optical data storage and nonvolatile memory (flash), is seriously hampered by the phenomena of unknown offset (drift) or gain. We will show that minimum Pearson distance (MPD) detection, unlike conventional minimum Euclidean distance detection, is immune to offset and/or gain mismatch. MPD detection is used in conjunction with T-constrained codes that consist of q-ary codewords, where in each codeword T reference symbols appear at least once. We will analyze the redundancy of the new q-ary coding technique and compute the error performance of MPD detection in the presence of additive noise. Implementation issues of MPD detection will be discussed, and results of simulations will be given. - K.A. Schouhamer Immink and J.H. Weber,
'The Application of Constrained Coding to Minimum Pearson Distance Detection in the Presence of Channel Mismatch',
Third International Workshop on Advances in Communications. Boppard am Rhein, Germany, May 2014.
- V. Skachek and K.A. Schouhamer Immink,
'Constant Weight Codes: An Approach Based on Knuth’s Balancing Method',
*IEEE Journal on Selected Areas in Communications, Special Issue on Mass Storage Systems,*Vol. 32, No. 5, pp. 908-918, May 2014. doi: 10.1109/JSAC.2014.140511.**Abstract**- In this article, we study properties and algorithms for constructing sets of constant weight codewords with bipolar symbols, where the sum of the symbols is a constant q, q\neq 0. We show various code constructions that extend Knuth's balancing vector scheme, q=0, to the case where q>0. We compute the redundancy of the new coding methods. Finally, we generalize the proposed methods to encoding of imbalanced arrays in two or more dimensions. - K.A. Schouhamer Immink,
'Coding Schemes for Multi-Level Flash Memories that are Intrinsically Resistant Against Unknown Gain and/or Offset Using Reference Symbols',
*IET Electronics Letters,*vol. 50, no. 1, pp. 20-22, 2 Jan. 2014. doi: 10.1049/el.2013.3558.**==2013==** - T.G. Swart and K.A. SchouhamerImmink, 'Prefixless q-ary Balanced Codes with ECC',
IEEE Information Theory Workshop, Sevilla, Sept. 2013.
- K.A. Schouhamer Immink, 'Coding Schemes for Multi-Level Channels with Unknown Gain and/or Offset', pp. 709-713,
Proceedings IEEE International Symposium on Information Theory (ISIT), Istanbul, Turkey,
July 2013.
- K.A. Schouhamer Immink, 'Prefixless q-ary Balanced Codes', Proceedings Eigtht Asian-European Workshop on Information Theory,
Fundamental Concepts in Information Theory, Kamakura, Kanagawa, Japan, May 17-19, 2013.
- J.H. Weber, K.A. Schouhamer Immink, P.H. Siegel, and T.G. Swart, 'Polarity-Balanced Codes', 2013 Information Theory
and Applications Workshop, San Siego, Feb. 10-15, 2013.
**==2012==** - H.C. Ferreira, J.H. Weber, C.H. Heyman, and K.A. Schouhamer Immink,
'Markers to construct dc free
*(d, k)*constrained balanced block codes using Knuth’s inversion', IET Electronics Letters, vol. 48, no. 19, pp. 1209-1211, Sept. 2012. - K.A. Schouhamer Immink, 'High-Rate Maximum Runlength Constrained Coding Schemes Using
Nibble Replacement',
*Trans. on Information Theory,*pp. 6572-6580, vol. 58, No. 10, Oct. 2012. - J.H. Weber, K.A. Schouhamer Immink, and H.C. Ferreira,
'Error-Correcting Balanced Knuth Codes',
*IEEE Trans. on Information Theory,*vol. 58, pp. 82-89, Jan. 2012.**==2011==** - J. Lee and K.A. Schouhamer Immink,
'Advanced Soft-Reliability Information-Based Post-Viterbi Processor',
*IEEE Trans. on Consumer Electronics,*vol. 57, pp. 1586-1591, Nov. 2011. - V. Skachek and K.A. Schouhamer Immink, 'Constant Weight Codes: An Approach Based on Knuth’s Balancing Method', Proceedings IEEE International Symposium on Information Theory (ISIT), pp. 286-290, St. Petersburg, Russia, Aug. 2011.
- K.A. Schouhamer Immink, J.H. Weber, and H.C. Ferreira, 'Balanced Runlength Limited Codes Using Knuth's Algorithm', Proceedings IEEE International Symposium on Information Theory (ISIT), pp. 282-285, St. Petersburg, Russia, Aug. 2011.
- K.A. Schouhamer Immink, 'High-Rate Maximum Runlength Constrained Coding Schemes Using Nibble Replacement', Proceedings IEEE International Symposium on Information Theory (ISIT), pp. 278-281, St. Petersburg, Russia, Aug. 2011.
- J. Lee and K.A. Schouhamer Immink,
'A New Post-Viterbi Processor Based on Soft-Reliability Information',
*Trans. on Consumer Electronics,*May 2011. - J.H. Weber, K.A. Schouhamer Immink, and H.C. Ferreira,
'Extension of Knuth's Balancing Algorithm with Error Correction',
Proceedings of the 32nd WIC Symposium on Information Theory in the Benelux, First joint WIC/IEEE SP Symposium on Information Theory and Signal Processing in the Benelux,
ISBN 9789081721905, Brussels, Belgium, pp. 43-50,
May 10-11, 2011.
**==2010==** - F. Song, S. Tao, F.T. Yu, S. Jutamulia, K.A. Schouhamer Immink, and K. Shono, Editors,
*Information Optics and Optical Data Storage*, SPIE Society of Photo-Optical Instrumentation, Beijing, Nov. 2010, ISBN 9-78081948381-2. - J. Lee and K.A. Schouhamer Immink, 'Advanced Signal Processing Technique for Storage Systems',
*IEEE Trans. on Consumer Electronics,*vol. 56. pp. 2373-2379, Nov. 2010. - K.A. Schouhamer Immink, 'High-Rate Maximum Runlength Constrained Coding Schemes Using Base Conversion',
Proceedings ISITA 2010, Taichung, Taiwan, pp. 469-472, Oct. 2010.
- J.H. Weber and K.A. Schouhamer Immink,
'Knuth's Balanced Codes Revisited',
*IEEE Trans. Inform Theory,*vol. 56, no. 4, pp.1673-1679, March 2010, doi: 10.1109/TIT.2010.2040868.**Abstract**- In 1986, Don Knuth published a very simple algorithm for constructing sets of bipolar codewords with equal numbers of 1s and -1s, called balanced codes. Knuth's algorithm is well suited for use with large codewords. The redundancy of Knuth's balanced codes is a factor of two larger than that of a code comprising the full set of balanced codewords. In this paper, we will present results of our attempts to improve the performance of Knuth's balanced codes. - K.A. Schouhamer Immink,
'Any Song, Anytime, Anywhere',
*AES Journal,*vol. 59, pp. 73-79, Jan/Feb. 2010. - K.A. Schouhamer Immink and J. Weber,
'Very Efficient Balanced Codewords',
*IEEE Journal on Selected Areas of Communications,*Special Issue on Signal processing and coding for digital storage, vol. 28, no. 2, pp. 188-192, 2010, doi: 10.1109/JSAC.2010.100207.**Abstract**- The prior art construction of sets of balanced codewords by Knuth is attractive for its simplicity and absence of look-up tables, but the redundancy of the balanced codes generated by Knuth's algorithm falls a factor of two short with respect to the minimum required. We present a new construction, which is simple, does not use look-up tables, and is less redundant than Knuth's construction. In the new construction, the user word is modified in the same way as in Knuth's construction, that is by inverting a segment of user symbols. The prefix that indicates which segment has been inverted, however, is encoded in a different, more efficient, way. - A. van Wijngaarden and K.A. Schouhamer Immink,
'Construction of Maximum Run-Length Limited Codes using Sequence Replacement Techniques',
*IEEE Journal on Selected Areas of Communications,*Special Issue on Signal processing and coding for digital storage, vol. 28, no. 2, pp. 200-207, 2010, doi: 10.1109/JSAC.2010.100209. The sequence replacement technique converts an input sequence into a constrained sequence in which a prescribed subsequence is forbidden to occur. Several coding algorithms are presented that use this technique for the construction of maximum run-length limited sequences. The proposed algorithms show how all forbidden subsequences can be successively or iteratively removed to obtain a constrained sequence and how special subsequences can be inserted at predefined positions in the constrained sequence to represent the indices of the positions where the forbidden subsequences were removed. Several modifications are presented to reduce the impact of transmission errors on the decoding operation, and schemes to provide error control are discussed as well. The proposed algorithms can be implemented efficiently, and the rates of the constructed codes are close to their theoretical maximum. As such, the proposed algorithms are of interest for storage systems and data networks. - K. Cai, K.A. Schouhamer Immink, Y.X. Lee, and Z. Qin,
'The Art of Combining Distance-Enhancing Constrained Codes with Parity-Check Codes for Data Storage Channels',
*IEEE Journal on Selected Areas of Communications,*Special Issue on Signal processing and coding for digital storage, vol. 28, pp. 208-217, 2010.**==2009==** - J. Lee and K.A. Schouhamer Immink,
'DC-free Multimode Code Design Using Novel Selection Criteria for Optical Recording Systems',
*IEEE Trans. on Consumer Electronics,*vol. 55. pp. 553-559, June 2009. - K.A. Schouhamer Immink and J. Weber, 'Simple Balanced Codes that Approach Capacity', Proc. IEEE ISIT2009 Conference, Seoul, Korea, pp. 1554-1858, June-July 2009.
- A. Kumar and K.A. Schouhamer Immink,
'Design of Close-to-Capacity Constrained Codes for Multi-Level Optical Recording',
*IEEE Trans. on Communications,*vol. 57, pp. 954-959, April 2009. - J. Lee and K.A. Schouhamer Immink,
'An Efficient Decoding Strategy of 2D-ECC for Optical Recording Systems',
*IEEE Trans. on Consumer Electronics,*vol. 55. pp. 1360-1363, Aug. 2009. - K.A. Schouhamer Immink and K. Cai,
'Simple classes of constrained systems with unconstrained positions that outperform the maxentropic bound',
*IEEE Trans. on Information Theory,*vol. 55, pp. 2000-2003, May 2009.**==2008==** - K. Cai, K.A. Schouhamer Immink, and Z. Qin, 'Distance-Enhancing Constrained Codes for Optical Recording Channels', IEEE Globecom Conference, New Orleans, Dec. 2008.
- A. Kumar and K.A. Schouhamer Immink,
'Construction of Capacity Achieving (M,d,infty) Constrained Codes with Least Decoder Window Length',
*IEEE Trans. on Information Theory,*vol. 54, nr. 10, pp. 4724-4726, Oct. 2008. - K. Cai and K.A. Schouhamer Immink,
'A General Construction of Constrained Parity-Check Codes for Optical Recording,'
*IEEE Trans. on Communications,*vol. 55, pp. 1070-1079, July 2008. - K.A. Schouhamer Immink and K. Cai, 'Simple classes of constrained systems with unconstrained positions that outperform the maxentropic bound', IEEE ISIT2008 Conference, Toronto, pp. 1553-1556, July 2008.
- J.H. Weber and K.A. Schouhamer Immink,
'Knuth's Balancing of Codewords Revisited', Proceedings IEEE International Symposium on Information Theory (ISIT),
Toronto, Canada, pp. 1567-1571, July 2008.
**==2007==** - K.A. Schouhamer Immink,
Shannon, Beethoven, and the Compact Disc,
*IEEE Information Theory Society Newsletter,*Vol. 57, No. 4, Dec. 2007. - K.A. Schouhamer Immink, 'The Birth of the Compact Disc',
*IEEE Consumer Electronics Society Newsletter,*Dec. 2007. - K. Cai, K.A. Schouhamer Immink, Z. Qin, X.S. Miao, L.P. Shi, and T.C. Chong, 'Error Correction Code Failure Rate Analysis for Parity-Check-Coded Optical Recording
Systems', Proceedings ISOM Conference, Singapore, pp. 196-197, Oct. 21-25, 2007.
**==2006==** - K. Cai and K.A. Schouhamer Immink,
'On the Number of Encoder States for Certain Capacity Approaching
*d=1*Codes'.*IEEE Trans. on Inform. Theory,*vol. 52, no. 7, pp. 3313-3319, July 2006. - K. Cai, K.A. Schouhamer Immink, J. Bergmans, and L.P. Shi, 'Constrained Parity-Check Code
and Post-Processor for Advanced Blue Laser Disc',
*JJAP,*vol. 45, No. 2B, pp. 1071-1078, 2006.**==2005==** - K. Cai and K.A. Schouhamer Immink, 'On the Number of Encoder States for Certain Capacity Approaching
*d=1*Codes', IEEE ISIT2005 Conference, Adelaide, Sept. 2005. - D. Xu, K.A. Schouhamer Immink, and K. Shono,
*Advances in Optical Data Storage Technology*, SPIE Society of Photo-Optical Instrumentation, Beijing, Jan. 2005, ISBN 0-8194-5598-9. - K. Cai and K.A. Schouhamer Immink, 'On the Design of Efficient Constrained Parity-Check Codes for Optical Recording', Proceedings IEEE International Symposium on Information Theory (ISIT), Adelaide, Sept. 2005.
- K. Cai, K.A. Schouhamer Immink, and J. Bergmans,
'Novel Constrained Parity-Check Code and Post-Processor for Advanced Blue Laser Disk',
International Symposium on Optical Memory and Optical Data Storage, ISOM/ODS05, Honolulu, Hawaii, July 10-14, 2005.
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**==2004==** - K.A. Schouhamer Immink,
*Codes for Mass Data Storage Systems, Second fully revised edition*, Shannon Foundation Publishers, Eindhoven, The Netherlands, Nov. 2004. ISBN 90-74249-27-2. Download here - K.A. Schouhamer Immink,
*Coding and Signal Processing for Magnetic Recording Systems*, B. Vasic and E.M. Kurtas (Editors), CRC Press, Series: Computer Engineering Volume: 2, Nov. 2004, ISBN 08-49315-24-7. - K.A. Schouhamer Immink,
*Codes for Mass Data Storage Systems*(in Chinese), Science Press, Beijing, China, 2004. ISBN 7-03-013379-X. - A.J. van Wijngaarden and K.A. Schouhamer Immink, 'On Guided Scrambling with Guaranteed Maximum Run-length Constraints', IEEE Int. Symposium on Information Theory (ISIT), Chicago, June 2004.
- A.J. van Wijngaarden and K.A. Schouhamer Immink, 'On the Selection of Guided Scrambling Sequences that Provide Guaranteed Maximum Run-length Constraints', WIC Symposium on Information Theory, Rolduc, pp. 25-29, May 2004.
- J.H. Weber, L.M.G.M. Tolhuizen, and K.A. Schouhamer Immink, "Channel Coding", Chapter 4 (pp. 89-116) in "Information Theory in the Benelux: An overview of WIC symposia 1980-2003", R.L. Lagendijk, L.M.G.M. Tolhuizen, and P.H.N. de With (Editors), Werkgemeenschap voor Informatie- en Communicatietheorie (WIC), Enschede, May 2004, ISBN 90-71048-19-5.
- K.A. Schouhamer Immink and K. Cai, 'On the Size of a Type of RLL codes', WIC Symposium on Information Theory, Rolduc, pp. 39-46, May 2004.
- K.A. Schouhamer Immink, 'From Analog to Digital',
Heyser Memorial Lecture, AES 116th Convention, Messe Berlin - Berlin, Germany, May 9, 2004.
**==2003==** - A.J. van Wijngaarden and K.A. Schouhamer Immink, 'On Error Propagation Assessment of High-rate Runlength-Limited Codes', IEEE Int. Symposium on Information Theory (ISIT), Yokohama, June 2003.
- Ming Jin, K. A. S. Immink, and B. Farhang-Boroujeny,
'Design Techniques for Weakly Constrained Codes',
*Trans. on Communications*, vol. 51, no. 5, pp. 709-714, May 2003. - K.A. Schouhamer Immink, 'Author's reply to comments on the "President's Message"',
*AES Journal,*vol. 52, pp. 251-252, April 2003. - K.A. Schouhamer Immink, J.Y. Kim, S.W. Suh, and S.K. Ahn,
'Efficient Dc-free RLL codes for Optical Recording',
*IEEE Trans. on Communications*, vol. 51, no. 3, pp. 326-331, March 2003.**==2002==** - K.A. Schouhamer Immink, 'President's Message',
*AES Journal,*vol. 51, pp. 1011, Dec.2002. - K.A. Schouhamer Immink, 'A Comparison of the Low-Frequency Properties of DC-free Codes Generated by Look-Ahead and Guided Scrambling Techniques', Proc. ISITA 2002, Xi'an, China, pp. 271-273, Oct. 2002
- K.A. Schouhamer Immink, J.Y. Kim, S.W. Suh, and S.K. Ahn, 'Construction of Efficient Dc-free RLL codes for Optical Recording',
*Japanese Journal on Applied Physics*, Part 1, vol. 41, No. 3B, pp. 1777-1780, March 2002. - S.W. Suh, S.K. Ahn, J.Y. Kim, and K.A. Schouhamer Immink, ' 'Performance of GS913 (guided scrambling nine to thirteen) modulation
code for high density rewritable optical disc', Optical Memory and Optical Data Storage Topical Meeting, Honolulu, pp. 153-155, 2002.
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**==2001==** - K.A. Schouhamer Immink, 'Levensbericht Claude E. Shannon', Koninklijke Nederlandse Akademie van Wetenschappen, pp. 101-105, 2001.
- K.A. Schouhamer Immink, J.Y. Kim, S.W. Suh, and S.K. Ahn,
'Extremely Efficient Dc-free RLL codes for Optical Recording',
*IEEE Trans. on Consumer Electronics*, pp. 910-914, Nov. 2001. - Ming Jin, K. A. S. Immink, and B. Farhang-Boroujeny, 'A Novel Design Technique for Weakly Constrained Codes', Proceedings IEEE Glocecom, San Antonio, Nov. 2001.
- K.A. Schouhamer Immink, 'Codes for Optical Recording',
*Proc. of the 6th International Symposium on Communications Theory and Applications*, Ambleside, UK, 15-20 July 2001. - K.A. Schouhamer Immink, J.Y. Kim, S.W. Suh, and S.K. Ahn, 'Extremely Efficient Dc-free RLL
codes for Optical Recording',
*Proc. ICCE*, Los Angeles, pp. 260-261, June 2001. - K.A. Schouhamer Immink, 'New RLL codes',
*Proc. IEEE ISIT2001*, Washington, USA, June 23, 2001. - K.A. Schouhamer Immink, J.Y. Kim, S.W. Suh, and S.K. Ahn, 'Extremely Efficient Dc-free RLL codes for
Optical Recording',
*Proceedings SPIE ODS*, Santa Fe, USA, April 2001. - J. Moon, H. Thapar, B.V.K.V. Kumar, and K.A. Schouhamer Immink,
'Editorial Signal Processing for High Density Storage Channels',
*IEEE Journal on Selected Areas of Communications, Special Issue on Signal processing and coding for digital storage,*vol. 19, pp. 577-581, April 2001. - A. van Wijngaarden and K.A. Schouhamer Immink,
'Maximum Runlength Limited Codes with Error Control Capabilities',
*IEEE Journal on Selected Areas of Communications, Special Issue on Signal processing and coding for digital storage,*vol. 19, pp. 602-611, April 2001. - K.A. Schouhamer Immink,
'A Survey of Codes for Optical Disc Recording',
*IEEE Journal on Selected Areas of Communications, Special Issue on Signal processing and coding for digital storage,*vol. 19, pp. 751-764, April 2001.**==2000==** - V. Braun and K.A. Schouhamer Immink,
'An Enumerative Coding Technique for Dc-free Runlength-Limited Sequences',
*IEEE Trans. on Communication,*vol. 48, pp. 2024-2031, Dec. 2000. - W.Y.H. Wang, K.A. Schouhamer Immink, X.B. Xu, and C.T. Chong, 'Guided Scrambling: A New Coding Technique for Holographic Storage', Proc. IEEE GlobeCom 2000, San Francisco, Dec. 2000.
- K.A. Schouhamer Immink, 'Coding for optical disc recording', IEEE ICC2000 Workshop, New Orleans, USA, June 2000.
- K.A. Schouhamer Immink and A.J.E.M. Janssen,
'Capacity of weakly (d,k) constrained sequences',
*Proc. IEEE ISIT2000*, Sorrento, Italy, pp. 144, June 16-21, 2000. - K.A. Schouhamer Immink and W.Y.H. Wang, 'A comparison of two dc-free rll coding schemes',
*Proc. IEEE ISIT2000*, Sorrento, Italy, pp. 352, June 16-21, 2000. - A.J.E.M. Janssen and K.A. Schouhamer Immink,
An Entropy Theorem for Computing the Capacity of Weakly (d,k) Constrained Sequences',
*IEEE Trans. Inform. Theory,*pp. 1034-1038, May 2000. - W.Y.H. Wang, K.A. Schouhamer Immink, X.B. Xu, and C.T. Chong, 'An Efficient Coding Technique for Holographic Storage with the Method of Guided Scrambling,Proc. SPIE ODS 2000, pp. 191-196, Whistler, Canada, 14-17, May 2000.
- K.A. Schouhamer Immink,
'Dc-free codes of rate
*n/(n-1), n*odd',*IEEE Trans. Inform. Theory,*pp. 633-634, March 2000.**==1999==** - K.A. Schouhamer Immink,
*Codes for Mass Data Storage Systems*, Shannon Foundation Publishers, Eindhoven, The Netherlands, 1999. ISBN 90-74249-23-X. Download here - K.A. Schouhamer Immink and A.J.E.M. Janssen,
'Error Propagation Assessment of Enumerative Coding Schemes',
*IEEE Trans. Inform. Theory,*pp. 2591-2594, no. 7, Nov. 1999. - Y.H.W. Wang, K.A. Schouhamer Immink, X.B. Xu, and C.T. Chong, 'Comparison of two coding schemes for generating dc-free RLL sequences', Int. Symp. on Optical Data Storage, Hawaii, July 1999.
- K.A. Schouhamer Immink,
'The Future of Digital Audio Recording',
*J. Audio Eng. Soc.,*vol. 47, pp. 171-172, 1999. - G. Khachatrian and K.A. Schouhamer Immink, 'Construction of simple runlength-limited codes', IEE Electronics Letters, vol. 35, no 2, pp. 140, 1999.
- K.A. Schouhamer Immink, 'A Survey of High-rate Codes', Proc. Asian Symposium on Information Storage Technology', pp. 133-139, Singapore, Jan. 25-26, 1999.
- K.A. Schouhamer Immink, P.H. Siegel, and J.K. Wolf, 'Codes for recording channels',
*Information Theory: 50 Years of Discovery,*S.W. McLaughlin and S. Verdu (Editors), IEEE Press, 1999, pp. 216-255, ISBN 7-80353-63-3.**==1998==** - K.A. Schouhamer Immink, P.H. Siegel, and J.K. Wolf,
'Codes for recording channels',
Invited for the special issue of
*IEEE Trans. Inform. Theory,*pp. 2260-2299, Oct. 98, vol. 44, which commemorates the 50th anniversary of Shannon's landmark paper. - K.A. Schouhamer Immink, 'Dc-free codes of rate
*n/(n-1), n*odd',*Proc. IEEE ISIT98*, Boston, USA, Aug 16-21, 1998. - A. van Wijngaarden and K.A. Schouhamer Immink,
'Efficient Error Control Schemes for Modulation and Synchronization Codes',
*Proceedings IEEE ISIT98*, Boston, USA, Aug. 16-21, 1998. - K.A. Schouhamer Immink and A.J.E.M. Janssen, 'Error Propagation Assessment of Enumerative Coding Schemes', Proc. IEEE ICC98, Atlanta, June 1998.
- K.A. Schouhamer Immink,
'The Compact Disc Story',
*AES Journal,*pp. 458-465, May 1998.**==1997==** - K.A. Schouhamer Immink, 'High-rate constrained codes', Journal of IEICE, IT97-56, (1997-12), Dec. 1997 (Invited paper).
- K.A. Schouhamer Immink and A.J.E.M. Janssen, 'Effects of Floating-Point Arithmetic in Enumerative Coding',
*Proc. 18th Symposium on Information Theory Symposium in the Benelux*, Veldhoven, The Netherlands, pp. 70-75, May 1997. - A. van Wijngaarden and K.A. Schouhamer Immink, 'Construction of Constrained Codes employing Sequence Replacement Techniques',
*Proceedings IEEE International Symposium on Information Theory (ISIT)*, Ulm, Germany. pp. 144, June 29, 1997. - K.A. Schouhamer Immink,
'Weakly constrained codes',
*IEE Electronics Letters,*vol. 33, no. 23, pp. 1943-1944, Nov. 1997. - K.A. Schouhamer Immink, 'Channel Codes for Digital Magnetic and Optical Recorders', Chapter 8,
*Digital Consumer Electronics Handbook*, McGraw-Hill, 1997. - K.A. Schouhamer Immink,
'EFM coding: Squeezing the last bits',
*IEEE Trans. Consumer Electr.,*vol. CE-43, pp. 491-495, Aug. 1997. - K.A. Schouhamer Immink,
'A Practical Method for Approaching the Channel Capacity of Constrained Channels',
*IEEE Trans. Inform. Theory,*vol. IT-43, no. 5, pp. 1389-1399, Sept. 1997. - K.A. Schouhamer Immink, 'A Survey of Channel Codes for Digital Recorders',
*Tijdschrift van het NERG*, vol. 62, nr. 1, pp. 20-29, 1997. - K.A. Schouhamer Immink and L. Patrovics,
'Performance Assessment of DC-free Multi-Mode Codes',
*IEEE Trans. Commun.,*vol. COM-45, no. 3, pp. 293-299, March 1997. - K.A. Schouhamer Immink, 'Digital Versatile Disc (DVD)',
IEE Half-Day Colloquium on New High Capacity Digital Media and Their Application, 1997.
**==1996==** - K.A. Schouhamer Immink and G. van den Enden,
'A Comparison of Rotary- and Stationary-Head Video Tape Recorders',
*IEEE Trans. Consumer Electr.,*vol. CE-42, pp. 998-1002, no. 4, Nov. 1996. - K.A. Schouhamer Immink,
'Code configuration for avoiding error propagation',
*IEE Electronics Letters,*vol. 32, No. 24, pp. 2191-2192, Nov. 1996. - K.A. Schouhamer Immink, 'EFMPlus: The coding technique of the DVD',
*Nikkei Electronics*, no. 675, pp. 161-165, Nov. 1996 (in Japanese). - K.A. Schouhamer Immink and A. van Wijngaarden,
'Simple High-Rate Constrained Codes',
*IEE Electronics Letters,*vol 32, pp. 1877, no. 20, Sept. 1996. - L. Patrovics and K.A. Schouhamer Immink,
'Encoding of
*dklr*-sequences using one weight set',*IEEE Trans. Inform. Theory,*vol. IT-42, pp. 1553-1555, no. 5, Sept. 1996. - K.A. Schouhamer Immink,
'A rate 4/6, (
*d=1, k=11*) Block Decodable RLL Code',*IEEE Trans. Inform. Theory,*vol. IT-42, pp. 1551-1553, no. 5, Sept. 1996. - K.A. Schouhamer Immink,
'The Digital Versatile Disc (DVD): System Requirements and Channel Coding',
*SMPTE Journal*, vol. 105, pp. 483-489, no. 8, Aug. 1996. - A. van Wijngaarden and K.A. Schouhamer Immink, 'Combinatorial construction of high-rate runlength-limited codes', Proceedings IEEE Globecom, London, pp. 343-347, Nov. 1996.
- K.A. Schouhamer Immink, 'Figure 1 Revisited', Proceedings ISITA'96, Victoria, Canada, Sept. 1996.
**==1995==** - L.M.G.M. Tolhuizen, K.A. Schouhamer Immink, and H.D.L. Hollmann,
'Constructions and Properties of Block Codes for Partial-Response Channels',
*IEEE Trans. Inform. Theory,*vol. 41, pp. 2019-2026, Nov. 1995. - K.A. Schouhamer Immink,
'EFMPlus: The Coding Format of the MultiMedia Compact Disc',
*IEEE Trans. Consumer Electr.,*vol. CE-41, pp. 491-497, Aug. 1995. - K.A. Schouhamer Immink, G.J. van den Enden, and J.A.H. Kahlman,
'System Requirements of a Stationary-Head Multi-Track Recorder',
*IEEE Trans. Magn.,*vol 31, no. 2, pp. 1027-1030, March 1995. - J.A.H. Kahlman and K.A. Schouhamer Immink,
'Channel Code with Embedded Pilot Tracking Tones for DVCR',
*IEEE Trans. Consumer Electr.,*vol. CE-41, no. 1, pp. 180-185, Feb. 1995. - K.A. Schouhamer Immink, 'MultiMedia Compact Disc: Channel Coding and System Requirements', Proceedings 99th AES Convention, New York, Oct. 1995.
- K.A. Schouhamer Immink, Editor,
*Proceedings IEEE International Symposium on Synchronization,*Essen, Germany, Dec 1995, Shannon Foundation Publishers, ISBN 90-74249-07-8. - L. Patrovics and K.A. Schouhamer Immink, 'Performance Assessment of Guided Scrambling', Proceedings IEEE Third Symposium on Communications and Vehicular Technology in the Benelux, Eindhoven, The Netherlands, pp. 122-127, Oct 25-26, 1995.
- K.A. Schouhamer Immink,
'Constructions of Almost-Block-Decodable RLL Codes',
*IEEE Trans. Inform. Theory,*vol. 41, pp. 284-287, Jan. 1995.**==1994==** - V. Braun, K.A. Schouhamer Immink, M. Ribeiro, and G. v.d. Enden,
'On the Application of Sequence Estimation Algorithms in the DCC',
*IEEE Trans. Consumer Electr.,*vol. CE-40, no. 4, pp. 992-998, Nov. 1994. - K.A. Schouhamer Immink,
*RS Codes and the Compact Disc*, Chapter 3 in*Reed-Solomon Codes and Their Applications*, S.B. Wicker and V.K. Bhargava (Editors), IEEE Press, 1994. For info click here - V. Braun, K.A. Schouhamer Immink, M. Ribeiro, and G. v.d. Enden,
'Sequence estimation algorithms for the digital compact cassette', Proceedings IEEE International Symposium on Information Theory, 27 June-1 July 1994.
**==1992==** - K.A. Schouhamer Immink and P. de Bot (Editors),
*Proceedings 14th Information Theory Symposium in the Benelux*, Veldhoven, The Netherlands, May 1993, ISBN 90-71048-09-8. - K.A. Schouhamer Immink,
'Block-decodable Runlength-limited Codes Via Look-ahead Technique',
*Philips J. Res.,*vol. 46, no. 6, pp. 293-310, 1992. - K.A. Schouhamer Immink and H.D.L. Hollmann,
'Prefix-synchronized Run-Length-Limited Sequences',
*IEEE Journal on Selected Areas in Communications.,*Special Issue on Signal processing and coding for digital storage, vol. 10, pp. 214-222, Jan. 1992.**==1991==** - H.D.L. Hollmann and K.A. Schouhamer Immink,
'Performance of Efficient Balanced Codes',
*IEEE Trans. Inform. Theory,*vol. IT-37, pp. 913-918, May 1991. - K.A. Schouhamer Immink,
*Coding Techniques for Digital Recorders*, Prentice-Hall, Inc., Englewood Cliffs, New Jersey, 1991. (Out of sale) - A.J.E.M. Janssen and K.A. Schouhamer Immink,
'Entropy and Power Spectral Density of Asymmetrically Dc-constrained Sequences',
*IEEE Trans. Inform. Theory,*vol. IT-37, pp. 923-927, May 1991. - H. Ogawa and K.A. Schouhamer Immink, 'Optical Recording', Proceedings ICC, Denver, USA, 23-26 June 1991.
**==1990==** - K.A. Schouhamer Immink,
'Runlength-Limited Sequences',
*Proceedings IEEE,*vol. 78, no. 11, pp. 1745-1759, Nov. 1990. - K.A. Schouhamer Immink, Editor,
*Proceedings International IEEE Workshop on Information Theory Symposium*, Veldhoven, The Netherlands, June 1990. - K.A. Schouhamer Immink, 'Error detecting runlength-limited sequences', IEEE/IEE Eighth International Conference on Video, Audio and Data Recording, pp. 176-182, 24-26 April 1990.
- K.A. Schouhamer Immink,
'Spectral Null Codes',
*IEEE Trans. Magn.,*vol. MAG-26, pp. 1130-1135, March 1990.**==1989==** - K.A. Schouhamer Immink,
'Coding Techniques for the Noisy Magnetic Recording Channel, A State-of-the-Art Report',
*IEEE Trans. Commun.,*vol. COM-37, pp. 413-419, May 1989. - K.A. Schouhamer Immink,
'Graceful Degradation of Magnetic Recording Channels',
*IEEE Trans. Magn.,*vol. MAG-25, pp. 2780-2786, No. 3, May 1989. - R.J. van der Vleuten and K.A. Schouhamer Immink, 'A maximum likelihood detector for a class IV PR response magnetic recording system',
Proceedings 10th Symp. Inform. Theory in the Benelux, pp. 117-123, May 1989.
**==1988==** - K.A. Schouhamer Immink,
'Coding Techniques for Partial-Response Channels',
*IEEE Trans. Commun.,*vol. COM-36, pp. 1163-1165, Oct. 1988. - K.A. Schouhamer Immink, 'Transmission of Digital Sound over Channels with Unforeseen Bandwidth Limitation',
*J. IERE,*pp. 49-56, March/April 1988. - K.A. Schouhamer Immink, 'The performance of recording codes for digital magnetic storage', IERE Conference on video, audio, and data recording, 1988.
- K.A. Schouhamer Immink, Editor,
*Proceedings Ninth Information Theory Symposium in the Benelux*, Mierlo, The Netherlands, May 1988, ISBN 99-71048-04-7. - K.A. Schouhamer Immink,
'Signal-to-Noise Ratio of Pilot Tracking Tones Embedded in Binary Coded Signals',
*IEEE Trans. Magn.,*vol. MAG-24, pp. 2004-2009, March 1988. - K.A. Schouhamer Immink,
'Graceful Degradation of Digital Audio Transmission Systems',
*J. Audio Eng. Soc.,*vol. 36, pp. 27-33, Jan/Feb 1988.**==1987==** - K.A. Schouhamer Immink and G.F.M. Beenker,
'Binary Transmission Codes with Higher Order Spectral Zeros at Zero Frequency',
*IEEE Trans. Inform. Theory,*vol. IT-33, pp. 452-454, May 1987. - K.A. Schouhamer Immink, 'Graceful Degradation of Digital Audio Transmission Systems',
*Proc. AES 82nd Convention,*preprint 2434-c3, March 1987.**==1986 and earlier==** - K.A. Schouhamer Immink,
'Coding Methods for High-Density Optical Recording',
*Philips J. Res.,*vol. 41, pp. 410-430, 1986. - K.A. Schouhamer Immink, 'On the Systematic Design of Dc-constrained Recording Codes', Proceedings 6th Int. Conference on Video, Audio and Data Recording, Brighton, pp. 147-150, March 1986.
- K.A. Schouhamer Immink, 'Erratum Philips J. Res. vol 41, pp. 410-430, 1986', Philips J. Res. vol 41, pp. 604, 1986.
- K.A. Schouhamer Immink,
*Properties and cnstructions of binary channel codes*, PhD Thesis, Eindhoven University of Technology, May 1985 (supervisors: Pieter Schalkwijk and Kenneth W. Cattermole). - G. Bouwhuis, J. Braat, A. Huijser, J. Pasman, G. van Rosmalen, and K.A. Schouhamer Immink,
*Principles of Optical Recording*, Adam Hilger Ltd., Bristol and Boston, 1985. (Out of sale) - K.A. Schouhamer Immink, 'Spectrum Shaping with Binary DC
^{2}-constrained codes',*Philips J. Res.,*vol. 40, pp. 40-53, 1985. - K.A. Schouhamer Immink,
'Construction of Binary DC-constrained Codes',
*Philips J. Res.,*vol. 40, pp. 22-39, 1985. - G.F.M. Beenker and K.A. Schouhamer Immink, 'On the number of codewords of a DC
^{2}-balanced code', Proc. of the 6th Symp. Information Theory in the Benelux, pp. 133-139, May 1985. - K.A. Schouhamer Immink,
'Performance of Simple Binary DC-constrained Codes',
*Philips J. Res.,*vol. 40, pp. 1-21, 1985. - K.A. Schouhamer Immink and J.J.M. Braat,
'Experiments Toward an Erasable Compact Disc',
*J. Audio Eng. Soc.,*vol. 32, pp. 531-538, 1984. - K.A. Schouhamer Immink, A.H. Hoogendijk, and J. Kahlman,
'Digital Audio Modulation in the PAL and NTSC Video Disc Coding Formats',
*J. Audio Eng. Soc.,*vol. 32, pp. 883-888, 1984. - K.A. Schouhamer Immink, 'Performance of dc-constrained codes', Proceeding of the Fifth Symposium on Information Theory in the Benelux, pp. 133-139, Aalten, May 1984.
- K.A. Schouhamer Immink, 'Coding for Digital Optical Disc Systems', Proceedings 5th Int. Conf. Video and Data Recording, Southampton, pp. 107, 1984.
- K.A. Schouhamer Immink, A.H. Hoogendijk, and J. Kahlman,
'Digital Audio Modulation in the PAL and NTSC Video Disc Coding Formats',
'Digital Audio Modulation in the PAL and NTSC LaserVision Video Disc Coding Formats',
*IEEE Trans. Consumer Electr.,*vol. CE-29, pp. 543-551, Nov. 1983. - K.A. Schouhamer Immink and R.M. Aarts, 'Maximization of Information Density in Te-alloys', SPIE Conference on Optical Recording, Geneva, vol. 396, pp. 181-188, April 1983.
- G.F.M. Beenker and K.A. Schouhamer Immink,
'A Generalized Method for Encoding and Decoding Runlength-limited Binary Sequences',
*IEEE Trans. Inform. Theory,*vol. IT-29, pp. 751-754, 1983 - K.A. Schouhamer Immink, 'Some statistical properties of maxentropic runlength-limited sequences',
*Philips J. Res.,*vol. 38, pp. 138-149, 1983. - J.P.J. Heemskerk and K.A. Schouhamer Immink,
'Compact Disc: Systeem aspecten and modulatie',
*Nederlands Tijdschrift voor Fotonica,*pp. 11-21, Aug. 1983 (in Dutch). - J.P.M. Braat, K.A. Schouhamer Immink, and M. Urner-Willer, 'High-Density Magneto-Optical Recording', Proceedings SPIE Int. Conf., Arlington, vol. 420, pp. 206-214, June 1983.
- K.A. Schouhamer Immink and U. Gross, 'Optimization of Low-frequency Properties of Eight-to-Fourteen Modulation (EFM)',
*Radio and Electronic Engineer,*vol. 53, pp. 63-66, 1983. - K.A. Schouhamer Immink,
'Runlength-limited Code with Small Error Propagation',
*IEE Electronics Letters,*vol. 19, pp. 323-324, 1983. - K.A. Schouhamer Immink, 'Comments on "Channel codings for digital audio recording',
*J. Audio Eng. Soc.,*vol. 31, pp. 939-940, Dec. 1983. - H. Ogawa and K.A. Schouhamer Immink, 'EFM - The Modulation for the Compact Disc Digital Audio System', Collected Papers from the AES Premiere Conference, Rye, New York, pp. 178-188, 1982.
- J.P.J. Heemskerk and K.A. Schouhamer Immink,
'Compact Disc: System aspects and modulation',
*Philips Tech. Review,*vol. 40, pp. 157-164, 1982. - K.A. Schouhamer Immink, 'Modulation systems for digital audio discs with optical read-out', Proceedings IEEE Int. Conf. on Acoustics, speech and signal processing, Atlanta, pp. 587-589, June 1981.
- L.B. Vries, K.A. Schouhamer Immink, J.B. Nyboer, H. Hoeve, T.T. Doi, K. Odaka and H. Ogawa, 'The Compact Disc Digital Audio System: Modulation and Error correction', 67th AES Convention, no 1674, New York, Oct. 1980.
- K.A. Schouhamer Immink, 'Controller design based on a limit criterion',
*Automatica*, vol. 12, pp. 623-627, 1976.

*Last updated: April 2021*

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