Reciprocal, subtractive, audio spectrum equalizer

Details Reciprocal, subtractive, audio spectrum equalizer Reciprocal, subtractive, audio spectrum equalizer

1988-02-22

1990-01-02

Isen, Forester W.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Split rim mounting

333 28T, H03G 500

Patent

active

048918415

ABSTRACT:
An equalizer circuit is disclosed having adjustable bandpass filters connected with operational amplifiers in feedforward and feedback paths so as to form frequency selective boost and cut signal components, which are then combined to form the equalized output signal by a subtractive operation with a direct unfiltered signal path arranged in parallel with the filtered feedforward and feedback paths. The circuit exhibits a constant-Q operation in that it can be adjusted for selected frequency boost and cut without distortion of the component bandwidths of the individual filters.

REFERENCES:
patent: 3755749 (1973-08-01), Van Ryswyk
patent: 3921109 (1975-11-01), Gundry
patent: 4004253 (1977-01-01), Takasaki et al.
patent: 4176329 (1979-11-01), Moskowitz
patent: 4219788 (1980-08-01), Cordell
patent: 4336501 (1982-06-01), Ishikawa et al.
patent: 4438409 (1984-03-01), Katsumata
Lancaster, Active Filter Cookbook, 1979, p. 151.
Lancaster, Active Filter Cookbook, FIGS. 7-7 and 7-15(B), 1979.
J. Audio Eng. Soc., vol. 34, No. 9, Sep. 1986, "Constant-Q Equalizers", Dennis A. Bohn.

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