Television signal synchronizing apparatus with sync phase contro

Details Television signal synchronizing apparatus with sync phase contro Television signal synchronizing apparatus with sync phase contro

1984-10-05

1987-02-24

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 944, H04N 9475

Patent

active

046461361

ABSTRACT:
A television synchronizing apparatus for synchronizing an input television signal to a reference television signal. The input and output television signals are of the type which include several signal components including a video signal, a color subcarrier signal and a horizontal sync signal. The input television signal is stored in a memory at locations thereof which are determined by write-in memory addresses which are produced in synchronism with the input television signal. The input television signal is read-out or retrieved from the memory under the control of read out addresses which are produced in synchronism with the reference television signal. A control circuit controls the generation of the read-out addresses so that with reference to the composite television signal which is retrieved from the memory, the absolute value of the phase shift between the video signal and the horizontal sync signal of the composite television signal is not greater than one-half the period of the color subcarrier signal under all circumstances.

REFERENCES:
patent: 4054904 (1977-10-01), Saitoh et al.
patent: 4339770 (1982-07-01), Dennison et al.
patent: 4373168 (1983-02-01), Mizukami et al.

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