Distortion sound effects circuit

Details Distortion sound effects circuit Distortion sound effects circuit

1977-06-21

1979-12-25

Morrison, Malcolm A.

84 124, 84 111, G10D 500, G10H 102

Patent

active

041807073

ABSTRACT:
A distortion sound effects circuit producing an output signal corresponding to an input signal but containing one of four selected types of distortion. A compressor which includes a voltage-controlled amplifier first compresses the audio input signal within preselected limits, and the distortion operations are performed on the compressed audio signal to advantageously render the subsequent distortion operations insensitive to gross amplitude fluctuations of the input signal. The compressor includes means for full-wave rectifying the compressed audio signal. The full-wave rectified signal is provided as a distorted output signal containing hard-even distortion of the type commonly achieved by severely, asymmetrically clipping a signal. A distortion circuit includes single voltage controlled square-low amplifier to which the compressed audio signal is applied performs the other three types of distortion. Soft-odd distortion is achieved by slightly and symmetrically overloading the input stage of the amplifier by an amount less than would result in clipping at the output stage. Hard-odd distortion is achieved by symmetrically and severely overloading the input of the amplifier to cause clipping at the output stage. Soft-even type distortion is achieved by squaring the compressed audio signal through modulation of the amplifier gain with the compressed audio signal while it is also applied to the amplifier signal input. A mixer having three inputs respectively coupled with potentiometers respectively fed by the amplifier output, the full-wave rectifier output and the undistorted, compressed audio signal output of the compressor circuit enables a musician to mix the three signals in any desired proportion.

REFERENCES:
patent: 3229038 (1966-01-01), Richter
patent: 3719782 (1973-03-01), Barnum
patent: 3808540 (1974-04-01), Kabrick
patent: 3911776 (1975-10-01), Bergel
patent: 4021613 (1977-05-01), Kennedy
L. Feldman, "Time Delay", Audio, Dec., 1976, p. 44.

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