Buzz reduction circuit and TV/VCR combo using the same

Details Buzz reduction circuit and TV/VCR combo using the same Buzz reduction circuit and TV/VCR combo using the same

2005-08-23

2005-08-23

Chevalier, Robert (Department: 2616)

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

C386S349000

Reexamination Certificate

active

06934466

ABSTRACT:
Buzz reduction circuit for eliminating a vertical period buzz without being influenced by amplifier circuits in an audio signal line. A video signal of a VCR video head is input to a vertical synchronizing signal separating circuit to separate a vertical synchronizing signal. A vertical synchronizing pulse is obtained by an integral circuit and a vertical period buzz reduction signal is produced by a vertical period buzz reduction circuit, said vertical period buzz reduction signal having an equal output level and an inverted phase in comparison with the vertical period buzz. The vertical period buzz reduction signal is inputted to a pre-stage of an audio amplifier circuit in an audio output line of a linear audio head to reduce the vertical period buzz included in an output signal of the linear audio head.

REFERENCES:
patent: 2001/0026622 (2001-10-01), Takahashi et al.
patent: 410234005 (1998-09-01), None

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