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

1992-08-25

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

341 59, G11B 509

Patent

active

051424215

ABSTRACT:
A device for recording n-bit information words on a magnetic record carrier. A 1-bit digital word is affixed to each successive information word. The resulting (n+1)-bit information words are then encoded in an aT precoder into (n+1)-bit channel words (cW) which are recorded on the record carrier. The 1-bit digital words which are affixed are such that the running digital sum value of the output signal of the precoder has a desired pattern as a function of time. Consequently, for example, a pilot signal can be inserted into the channel word data stream which may be used to control tracking during reproduction of the recorded information from the record carrier. The values of a and n are such that a .gtoreq.2 and n.gtoreq.1. Preferably, n<<1, for example, n.ltoreq.10.

REFERENCES:
patent: 4750138 (1988-06-01), Schouhamer Immink

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