Audio fidelity frequency equalizer system

Details Audio fidelity frequency equalizer system Audio fidelity frequency equalizer system

1975-12-31

1977-09-06

Olms, Douglas W.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330109, 333 28T, H03H 716

Patent

active

040469603

ABSTRACT:
An audio fidelity frequency equalizer system for use with audio fidelity sound equipment in order to frequency contour sound reproduction to obtain a desired listening environment. The frequency equalizer system of the present invention includes a plurality of potentiometer controls for adjusting the frequency output in each of the eleven major separate octave bands which cover a range from approximately 20 Hz to approximately 20,000 Hz. The frequency equalizer system of the present invention includes an operational amplifier with each of the aforementioned potentiometers connected across the equalizer in feedback relationship. Moreover, each of the potentiometers operate in conjunction with a unique resonance circuit in order to achieve the desired frequency adjustability of the octave bands.

REFERENCES:
patent: 3356962 (1967-12-01), Morgan
patent: 3473142 (1969-10-01), Herrero et al.
patent: 3643173 (1972-02-01), Whitten
patent: 3752928 (1973-08-01), Flickinger
patent: 3895309 (1975-07-01), Rollett et al.
patent: 3921104 (1975-11-01), Gundry
patent: 3936777 (1976-02-01), Rollett et al.

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