ABSTRACT
The proper functioning of a digital video recorder
is largely governed by the selection of a suitable channel code
in conjunction with both the detection method and the tracking system.
The channel code for the Digital Video Cassette Recorder
(DVCR) satisfies a variety of design requirements.
The paper provides an overview of those requirements. A detailed description
is given of the construction of the new channel code, called 24\rarrow 25 code,
that complies with the given constraints and involves only a minor
drawback in terms of the overhead needed. The servo position information is
recorded as low-frequency components, pilot tracking tones,
which are embedded in the recorded stream of binary digits.
Key Words: magnetic recording, video recording