TV Privacy system using gray sync

Details TV Privacy system using gray sync TV Privacy system using gray sync

1981-12-09

1984-06-12

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358150, H04N 716

Patent

active

044545444

ABSTRACT:
A decoder for reconstructing a standard composite video signal with standard synchronizing pulses from a video signal V with only gray sync encoding E.sub.GS, of a repetition rate f.sub.GS, and comprising a first generator for generating a signal E.sub.VCO having a controllable frequency f.sub.VCO which, in the absence of frequency control, is slightly different from f.sub.GS, a second generator responsive to E.sub.VCO to form a composite blanking signal E.sub.B having a repetition rate equal to f.sub.VCO so that E.sub.B will slew with respect to E.sub.GS until E.sub.B and E.sub.GS become synchronized and a summer for summing E.sub.B and V to produce a reconstructed standard composite video signal when E.sub.B and E.sub.GS become synchronized. There is further provided a phase lock circuit for phase locking E.sub.VCO with the standard synchronizing pulses of said reconstructed video signal to maintain E.sub.B and E.sub.GS in a synchronized relationship.

REFERENCES:
patent: 3478166 (1969-11-01), Reiter et al.
patent: 3813482 (1974-05-01), Blonder
patent: 4095258 (1978-06-01), Sperber
patent: 4222068 (1980-09-01), Thompson
patent: 4313133 (1982-01-01), Fukushima

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