Television AFC system having complementary sound and picture car

Details Television AFC system having complementary sound and picture car Television AFC system having complementary sound and picture car

1977-04-28

1978-05-23

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 550

Patent

active

040914216

ABSTRACT:
A television receiver includes conventional systems for the reception and processing of a received broadcast signal. An AFC loop operative upon the tuning system frequency conversion produces complementary control effects by detection of both sound and picture carriers. A filter network provides frequency dependent phase shift of sampled IF signal which is applied to a product detector. The quadrature phase shift frequencies are selected to provide complementary control effects and avoid production of AFC offset at correct tuning.

REFERENCES:
patent: 3922483 (1975-11-01), Indri
patent: 3968325 (1976-07-01), Beriere

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