Automatic channel matching system and method thereof

摘要

An automatic channel matching system for viewing a video signal produced by a VCR at any channel at which a TV is tuned without changing the TV channel when in a VCR mode. A coarse tuning operation is first performed when receiving a VCR mode control signal by the system, which includes an RF channel frequency altering unit for variably generating a carrier wave frequency while shifting from a low channel frequency to a high channel frequency by a predetermined frequency bandwidth, generating a fixed current carrier wave frequency when the level of a detected synchronizing signal is higher than the level of noise in the signal output from a synchronizing signal detector, and generating a fixed carrier wave frequency tuned to match the channel frequency according to the output of a noise signal level converting unit.