Electrical audio signal processing systems and devices – Sound effects
Patent
1982-09-20
1986-04-22
George, Keith E.
Electrical audio signal processing systems and devices
Sound effects
381 98, H03G 300
Patent
active
045847002
ABSTRACT:
An electronic audio signal processor especially suitable for electrical instruments such as electric guitars is provided including a controlled distortion and tone alteration portion and a reverb portion. The controlled distortion and tone alternation portion in one form comprises in cascade a compression stage which compresses the amplitude level of an inputted audio signal, a mid band pass filter, a distortion amplifier for adding controlled distortion to said signal and a complex filter having a roll-off of increased attenuation with increased frequency range in the lower and upper audio frequency ranges, and a generally flat response in the middle audio frequency range except with a dip followed by a peak in the upper portion of the mid audio frequency range. The reverb circuit includes a synthetic doubler which provides an output cyclicly varying in pitch from its input and a stereo analog shift register reverb device having two summers which combine staggered adjacent output lines from an analog shift register in different combinations. Two output mixers in conjunction with a switch provide reverb alone, doubling alone or reverb with doubling.
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H. Tremaine, Audio Cyclopedia, H. Sams Co., 1969; pp. 937-939.
Electronics Today International, vol. 8, No. 10, Oct. 1979, pp. 47-49; "Audio Compressor".
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