Sound system gain and equalization circuit

Details Sound system gain and equalization circuit Sound system gain and equalization circuit

1995-03-30

1998-02-10

Tran, Sinh

Electrical audio signal processing systems and devices

Including frequency control

381104, 381 71, H03G 500, H03G 300

Patent

active

057177732

ABSTRACT:
A multi-band equalizer for receiving and processing an audio signal includes a plurality of operational amplifiers, each for processing a different frequency band of the audio signal to produce an output signal. Each operational amplifier includes an inverting input, a non-inverting input, a resistor means coupled to the non-inverting input for receiving the audio signal and supplying it to the non-inverting input, an output, a feedback circuit coupled between the output and the inverting input for determining the upper limits of the frequency band processed by that particular operational amplifier, and an input circuit coupled between the inverting input and ground potential for determining the lower limits of the frequency band processed by that operational amplifier. An additional operational amplifier is provided for processing a higher frequency band of the audio signal than those processed by the plurality of operational amplifiers, for producing an output signal. The additional operational amplifier includes the same elements as the plurality of operational amplifiers except the feedback circuit which is replaced by a resistor. A summing circuit is coupled to the outputs of all of the operational amplifiers for combining the output signals thereof to produce a resultant signal. The summing circuit includes a plurality of variable resistors, each coupled to the output of a different operational amplifier for selectively varying the magnitude of the output signal from the respective operational amplifiers.

REFERENCES:
patent: 3846719 (1974-11-01), Dolby
patent: 5515446 (1996-05-01), Velmer
Lecture Notes of Professor Allan K. Scidmore, University of Wisconsin-Madison, Sep. 1991.

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