CHANNEL VISUALIZATION CIRCUIT FOR DISTINGUISHING BETWEEN SIGNAL EXISTENCE AND NON-EXISTENCE IN A SATELLITE BROADCASTING RECEIVER

摘要

The invention relates to a circuit for distinguishing between the existence and non-existence of a signal in a broadcasting satellite receiver. It includes a video signal detection means 5, where the frequency modulation signal of an amplifier 2 with automatic gain control of intermediate frequency signal is detected between amplifier 2, a frequency signal level detector 3 intermediate and a microcomputer 9, as well as a channel display means 20 in which the state of existence or non-existence of the signal in a channel is viewed on a television set 10 via a part 7 of processing on screen controlled by the microcomputer 9.