Agc circuit used in a catv receiver

Details Agc circuit used in a catv receiver Agc circuit used in a catv receiver

H - Electricity

04

N

350/20

H04N 7/16 (2006.01) H04N 7/171 (2006.01)

Patent

CA 1219669

ABSTRACT OF THE DISCLOSURE An AGC circuit used in a subscriber's receiver of a CATV system in which the television signal is scramble-modulated so that only subscribers are allowed to view toll programs, wherein the detected video signal is conducted through a low-pass filter to extract the vertical sync signal, a keying pulse is produced in response to the vertical sync signal, and the AGC opera- tion is performed by the keying pulse in accordance with the magnitude of the vertical sync signal.

462277

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