Channel display circuit for distinguishing the existence or none

Details Channel display circuit for distinguishing the existence or none Channel display circuit for distinguishing the existence or none

1989-07-03

1991-07-23

Peng, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

3581911, 358 22, 358183, 358 93, 340715, 343894, H04N 550, H04N 974, H04N 5262, H04N 718

Patent

active

050348205

ABSTRACT:
A circuit for distinguishing the existence or non-existence of a signal at a satellite-broadcast receiver. The circuit includes an antenna adjusting part aimed toward the satellite after the satellite signal is tuned using a channel tuning stage driven by the output of a microcomputer. The level of the IF signal is detected by the IF signal AGC amplifier and the IF signal level detector. A video signal detecting stage detects the FM signal of the IF signal AGC amplifier output and the existence or nonexistence of the video signal is determined after audio/video signal processsing, and a channel displaying means, wherein the state of said video detecting part and the antenna position where video signal exists are displayed by on-sceen operations.

REFERENCES:
patent: 4214273 (1980-07-01), Brown
patent: 4349840 (1982-09-01), Henderson
patent: 4536797 (1985-08-01), Maturo et al.
patent: 4605968 (1986-08-01), Hayashi

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