Buzz cancelling system for television receiver
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsHiroshi Saito, Chihiro Adachi
Life of this patent
Estimating the term…
Abstract
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.
Claims5
A system for cancelling out buzz component from a sound signal in a television receiver, comprising:
- means for producing a sound IF signal through detection of a video IF signal, means for producing a sound signal by detecting said sound IF signal, means for producing a video signal by detecting said video IF signal, a buzz component cancelling a signal generator circuit for producing a buzz cancelling signal by detecting phase-modulated components of said video IF signal, and adder means for adding said buzz cancelling signal to said sound signal, whereby the buzz component contained in said sound signal is cancelled.
Dependencies are inferred from the claim text.