Automatic frequency control device for television receiver

Details Automatic frequency control device for television receiver Automatic frequency control device for television receiver

1974-08-02

1976-02-24

Libman, George H.

Telegraphy

Systems

Simplex-reversing periodic

325420, H04N 550

Patent

active

039405540

ABSTRACT:
An automatic frequency control device is disclosed wherein the S-shaped waveform character voltage derived by the FM detection of the video intermediate frequency signal is applied to a local oscillator so as to correct its oscillation frequency. The S-shaped waveform character voltage is corrected in response to the output voltage derived by the detection of the sound carrier of the adjacent receiving channel so that the pull-in range may be increased.

REFERENCES:
patent: 3584141 (1971-06-01), Fujiwara et al.
patent: 3858000 (1974-12-01), Merriweather et al.
Lavender, Automatic Frequency Control, RCA Technical Notes TN No. 348, Nov., 1959.

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