Buzz cancelling system for television receiver

摘要

A television receiver in which video IF signal is detected to produce a sound IF signal which is then detected to produce a sound signal, while at the same time video signal is produced by detecting the video IF signal. A buzz cancelling system is provided in which phase-modulated component of the video IF signal is detected or, alternatively, the detected video signal is differentiated thereby to produce a buzz cancelling signal which is then synthesized with the sound signal to cancel out the buzz component contained therein.