Digital vertical synchronization system for a television receive

Details Digital vertical synchronization system for a television receive Digital vertical synchronization system for a television receive

1980-04-21

1981-11-03

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 504

Patent

active

042988900

ABSTRACT:
A digital vertical synchronization system for a television receiver has a source of locally generated vertical sync pulses coupled to a vertical sweep system, a source of derived vertical sync pulses developed from and in a time relationship with received television signals, and a phasing circuit for testing the time relationship between the derived vertical sync pulses and the locally generated vertical sync pulses. The phasing circuit outputs a signal indicative of the test. The system includes means responsive to the phasing circuit for adjusting the phase of the locally generated vertical sync pulses, and a mode recognition circuit for determining whether the received television signal includes equalizing pulses in a vertical interval. The mode recognition circuit has an output for indicating whether the digital synchronization system should operate in a standard mode wherein the phase of the locally generated vertical sync pulses is adjusted at a first rate or in a nonstandard mode wherein the phase of the locally generated vertical sync pulses is adjusted at a second rate lower than the first rate. An improvement is disclosed which comprises forced means, associated with the mode recognition circuit and responsive to the phasing circuit output signal, for automatically forcing the made recognition circuit output to indicate nonstandard mode.

REFERENCES:
patent: 3691297 (1972-09-01), Merrell et al.
patent: 3916102 (1975-10-01), Merrell
patent: 4025951 (1977-05-01), Eckenbrecht

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