Synchronous detection system

Details Synchronous detection system Synchronous detection system

1979-07-02

1981-02-24

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

455260, 455265, 329 50, H04N 544

Patent

active

042531187

ABSTRACT:
A system is described for synchronously detecting a video signal along a selectable detection axis. The system includes a limiter receiving an input video signal and a phase-locked loop for developing an oscillator signal whose frequency is locked to the frequency of the video signal. A phase-adjustment network recieves the oscillator signal from the phase-locked loop for adjusting the phase of the oscillator signal such that it corresponds to the desired axis of detection. A synchronous detector receives the input video signal and the phase-adjusted oscillator signal for detecting the video signal along the selected detection axis.

REFERENCES:
patent: 3750029 (1973-07-01), Baars
patent: 3862361 (1975-01-01), George
patent: 3883806 (1975-05-01), DeLong
patent: 3939425 (1976-02-01), Toyoshima
patent: 4091410 (1978-05-01), Citta
patent: 4146843 (1979-03-01), Isobe
patent: 4157569 (1979-06-01), Apeldoorn

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