Equalizer and audio device using the same

Details Equalizer and audio device using the same Equalizer and audio device using the same

1995-11-07

1998-05-19

Kuntz, Curtis

Electrical audio signal processing systems and devices

Including frequency control

Automatic tone control

381 98, 333 28T, H03G 500

Patent

active

057546681

ABSTRACT:
An equalizer includes first and second differential amplifiers which have a common output and respective separate current sources, a first negative feed back circuit which feeds back a voltage signal extracted from the common output to the first differential amplifier, a second negative feed back circuit which feeds back the voltage signal to the second differential amplifier, and a filter circuit which is provided at either the first or the second negative feed back circuit and which differentiates frequency characteristics during signal amplification in the first and second differential amplifiers. A frequency characteristic is selected through selection of one of the current values of the respective current sources in response to a sound quality adjusting signal.

REFERENCES:
patent: 3849601 (1974-11-01), Goncharoff
patent: 4521818 (1985-06-01), Guisinger
patent: 4631525 (1986-12-01), Serravalle, Jr.
patent: 4982435 (1991-01-01), Kato et al.
patent: 5530769 (1996-06-01), Saitoh
Mitchell, F. H. et al, Introduction to Electronics Design, p. 472, 1988.

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