Sampling clock reproducing apparatus

Details Sampling clock reproducing apparatus Sampling clock reproducing apparatus

1980-06-02

1981-12-01

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

375113, 328138, 328139, H04N 704, H04L 706, H03B 100, H03K 500

Patent

active

043039421

ABSTRACT:
Improved sampling clock reproducing apparatus for receiving digital signal which is superimposed in the television signal during a vertical blanking interval. The sampling clock signal is made by selectively gating a pilot signal from the superimposed signal, obtaining a square thereof, then passing it through a resonance circuit with a resonance frequency twice a repetition frequency of the pilot signal. Thus, the sampling clock signal of the frequency twice the repetition frequency of the pilot signal is obtainable without digital processing attaining high durability against noises.

REFERENCES:
patent: 4202012 (1980-05-01), Hirashima

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