Video signal recording system

Details Video signal recording system Video signal recording system

1992-08-04

1994-05-10

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358340, 360 60, 348476, H04N 576

Patent

active

053113233

ABSTRACT:
A video recording system is provided with a copy guard arrangement which can readily discriminate a video signal having pseudo horizontal synchronizing pulses in a portion of a vertical blanking interval, from a normal video signal, without deteriorating the quality of recorded pictures. Preferably, an analog circuitry or a microcomputer is designed to count the horizontal synchronizing pulses received during a predetermined portion of the vertical blanking interval, and to discriminate a copy-guarded video signal from an unguarded video signal in accordance with the result of the counting. In the case of the copy-guarded video signal, an inhibit signal is produced to prevent a normal recording operation.

REFERENCES:
patent: 4488183 (1984-12-01), Kinjo
patent: 4907093 (1990-03-01), Ryan
patent: 4937679 (1990-06-01), Ryan
patent: 5134496 (1992-07-01), Schwab et al.
patent: 5153724 (1992-10-01), Miyoshi et al.
patent: 5172240 (1992-12-01), Nakazato
patent: 5172241 (1992-12-01), Lee

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