Device for recording a digital information signal on a record ca

Details Device for recording a digital information signal on a record ca Device for recording a digital information signal on a record ca

1991-06-06

1992-08-18

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

341 39, G11B 509

Patent

active

051404745

ABSTRACT:
In a run length limited digital signal of the d,k type, (d+m)-bit digital words are inserted at specific instants in the data stream in a manner such that the signal thus obtained is a run length limited signal of the d,k' type, where k' is greater than or equal to k. This signal is then encoded in an aT precoder, a being an integer such that a .gtoreq.1, and recorded on a magnetic record carrier (21). Such (d+m)-bit digital words are inserted so that the digital sum value of the output signal of the precoder has a desired pattern as a function of time. Thus, for example, a pilot signal can be accommodated in the output data stream of the precoder, which pilot signal can be detected during reproduction of the recorded signal. From this detected pilot signal a control signal can be derived for controlling tracking during reproduction of the recorded signal.

REFERENCES:
patent: 4779072 (1988-10-01), Van Gestel
patent: 4914438 (1990-04-01), Kameyama

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