Sound quality adjustment circuit

Details Sound quality adjustment circuit Sound quality adjustment circuit

1997-09-19

2000-10-31

Isen, Forester W.

Electrical audio signal processing systems and devices

Including frequency control

381103, 327553, 334 29, H03G 500, H03G 502, H03K 500

Patent

active

061414255

ABSTRACT:
A sound quality adjustment circuit including a status variable type active band-pass filter having an amplification circuit fed with an input signal and an integration circuit, and a controller for controlling the conversion conductance of the amplification circuit. The center frequency of the status variable type active band-pass filter is continuously varied by controlling the conversion conductance of the amplification circuit by the controller.

REFERENCES:
patent: 4393353 (1983-07-01), Minagawa
patent: 4994766 (1991-02-01), Miura
patent: 5182478 (1993-01-01), Nomura
patent: 5745001 (1998-04-01), Ueshima et al.
Don Lancaster, Active Filter cookbook, Howard W. Sams & Co., Inc. ISBN 0-672-21168-8, pp. 171-176, Jan. 1975.

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