Apparatus for recording a digital information signal and utilizi

Details Apparatus for recording a digital information signal and utilizi Apparatus for recording a digital information signal and utilizi

1989-04-13

1992-08-04

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

360 7713, 375 19, G11B 509, G11B 2014, G11B 5584, H04L 2534

Patent

active

051364360

ABSTRACT:
Apparatus for recording a digital information signal and an auxiliary signal in information tracks of a record carrier without adding the auxiliary signal to the recorded signal. The apparatus converts consecutive information words of the information signal into channel words in accordance with a channel code such that at least three channel words of mutually different disparities are available for such conversion. Selection of a particular channel word for a given information word is determined by a control signal derived from the auxiliary signal and which controls such selection so that the digital sum value (DSV) of the recorded channel words varies substantially in accordance with the auxiliary signal. The control signal is produced from the difference between the auxiliary signal and the DSV of the channel words. Both of the recorded signals can be read by apparatus which converts the recorded channel words into the corresponding information words and also converts the DSV of the recorded channel words into the auxiliary signal.

REFERENCES:
patent: 4511933 (1985-04-01), Hofelt et al.
patent: 4520346 (1985-05-01), Shimada

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