Video carrier recognition system

Details Video carrier recognition system Video carrier recognition system

1978-02-06

1980-02-26

Safourek, Benedict V.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

455192, H04N 550

Patent

active

041908627

ABSTRACT:
A video carrier recognition system for use with a signal seeking television receiver tuner or the like includes a plurality of detectors for recognizing certain conditions indicating that the receiver is appropriately tuned to a video carrier signal. The conditions comprise AFC system lock, the presence of a relatively low peak duty cycle characterizing the low-pass filtered output of the receiver's video detector and the absence of a relatively large amplitude 1.5 MHz beat note at the output of the video detector. In addition, noise immunity may be provided by requiring correlation between the low-pass filtered output of the video detector and the horizontal flyback pulses developed in the horizontal deflection system of the receiver.

REFERENCES:
patent: 3632864 (1972-01-01), Evans
patent: 3737565 (1973-06-01), Ma et al.
patent: 3825838 (1974-07-01), Mayle
patent: 3949158 (1976-04-01), Rzeszewski et al.
patent: 4038689 (1977-07-01), Rzeszewski et al.

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