Jah. Kahlman et Kas. Immink, CHANNEL CODE WITH EMBEDDED PILOT TRACKING TONES FOR DVCR, IEEE transactions on consumer electronics, 41(1), 1995, pp. 180-185
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 c
ode, called 24-->25 code, that complies with the given constraints and
involves only a minor drawback in terms of the overhead needed. The s
ervo position information is recorded as low-frequency components, pil
ot tracking tones, which are embedded in the recorded stream of binary
digits.