Apparatus for generating a digital recording signal which avoids

Pulse or digital communications – Pulse code modulation

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375365, 360 40, 341 61, 341 95, H04B 1404, H03M 700, G11B 2010

Patent

active

056595778

ABSTRACT:
In a digital information modulating apparatus, first information signal is separated every m bit or bits, and n bit or bits are added to the head of every m bit or bits to change every m bit or bits of the first information signal into every m+n bits of a second information signal, where "m" and "n" denote predetermined natural numbers. The second information is pre-coded into plural pre-coded information signals in accordance with combinations of the added n bit or bits. A determination is made as to whether or not predetermined sync information is present in the pre-coded information signals. A sync detection signal is generated which represents the result of the determination. One of the pre-coded information signals is selected as a modulation-resultant output signal in response to the sync detection signal.

REFERENCES:
patent: 4512026 (1985-04-01), Vander Meiden
patent: 4541104 (1985-09-01), Hirosaki
patent: 4775985 (1988-10-01), Busby
patent: 5016258 (1991-05-01), Tanaka et al.
patent: 5140474 (1992-08-01), Kahlman et al.
patent: 5142421 (1992-08-01), Kahlman et al.

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