Sync signal generator with memorization of phase detection outpu

Details Sync signal generator with memorization of phase detection outpu Sync signal generator with memorization of phase detection outpu

1977-04-01

1978-10-24

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358158, 331 20, H04N 946, H04N 506, H03B 306

Patent

active

041224884

ABSTRACT:
A television synchronizing signal generator includes a synchronizing signal separator circuit for separating a synchronizing signal from a video signal, an oscillator the oscillatory frequency of which is controllable, a phase discriminator for discriminating outputs of the synchronizing signal separator circuit and the oscillator, a memory circuit for memorizing an output of the phase discriminator, a switching circuit for applying alternatively the output of the phase discriminator and the output of the memory as a control signal to the oscillator to control the oscillatory frequency thereof, and an input state detector for detecting the input amplitude and noise state of the video signal such that the switching action of the switching circuit is controlled in accordance with the output of the input state detector. With such a generator, a stable picture can be obtained in a television receiver, even although the received video signal is temporarily abnormal.

REFERENCES:
patent: 3507983 (1970-04-01), Leman
patent: 3659040 (1972-04-01), Fujita
patent: 3909839 (1975-09-01), Inaba et al.
patent: 4015287 (1977-03-01), Hovens
patent: 4015288 (1977-03-01), Ebihara et al.
Radio Shack Dictionary of Electronics, 1974-1975, 4th edition, 1974, p. 527.

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