Electrical audio signal processing systems and devices – Sound effects
Patent
1990-01-18
1992-07-21
Isen, Forester W.
Electrical audio signal processing systems and devices
Sound effects
307490, 307268, 328 16, 84692, 84701, 84735, 84737, H03G 300
Patent
active
051330148
ABSTRACT:
A distortion synthesizer, having a first distortion circuit, a tone control circuit for altering the tonality of the first distorted signal and a second distortion circuit for introducing harmonics into said tone controlled signal. At least one of the distortion circuits introduces harmonics without clipping. The second distortion circuit also for clips the resultant signal as a function of said resultant signal. The first distortion circuit limits and introduces even harmonics, preferrably predominantly second harmonics. The second distortion circuit introduces odd harmonics, preferrably by predominantly third harmonics, prior to clipping, and also compress the signal. The distortion circuits include a variable gain stage which increases with increased input using a plurality of switches which progressively add parallel resistors to progressively increase output current. A circuit simulating transformer saturation is also provided in the second distortion circuit.
REFERENCES:
patent: 3551694 (1970-12-01), Boxall
patent: 4034304 (1977-07-01), Hallock
patent: 4532604 (1985-07-01), Baker
patent: 4995084 (1991-02-01), Pritchard
patent: 5032796 (1991-07-01), Tiers et al.
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