Sound system gain and equalization circuit
First Claim
1. A voltage gain and equalization circuit for processing a received audio signal, comprising:
- a plurality of operational amplifier means, each for processing and selectively amplifying a different frequency band of the audio signal to produce an output signal with generally no phase shift, and each includingan inverting input,a non-inverting input for receiving the audio signal,an output,high pass filter means coupled between the inverting input and ground for determining the lower end of the frequency band processed by said each operational amplifier means,low pass filter means coupled between the output and the inverting input for determining the upper end of the frequency band processed by said each operational amplifier means, andsumming means coupled to the outputs of each operational amplifier means for combining the output signals, each output signal passing a different frequency band of the audio signal thereof, to produce a resultant signal.
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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. 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.
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Citations
14 Claims
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1. A voltage gain and equalization circuit for processing a received audio signal, comprising:
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a plurality of operational amplifier means, each for processing and selectively amplifying a different frequency band of the audio signal to produce an output signal with generally no phase shift, and each including an inverting input, a non-inverting input for receiving the audio signal, an output, high pass filter means coupled between the inverting input and ground for determining the lower end of the frequency band processed by said each operational amplifier means, low pass filter means coupled between the output and the inverting input for determining the upper end of the frequency band processed by said each operational amplifier means, and summing means coupled to the outputs of each operational amplifier means for combining the output signals, each output signal passing a different frequency band of the audio signal thereof, to produce a resultant signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A multiple-band equalizer for receiving and processing an audio signal comprising
a plurality of operational amplifier means, each for processing a different frequency band of the audio signal to produce an output signal, and each including an inverting input, a non-inverting input, an output, feedback circuit means- coupled between the output and the inverting input for determining the upper limits of the frequency band processed by said each operational amplifier means, and input circuit means coupled between the inverting input and ground potential for determining the lower limits of the frequency band processed by said each operational amplifier means, summing circuit means coupled to the outputs of each operation amplifier means for combining the output signals thereof to produce a resultant signal.
Specification