Electrical audio signal processing systems and devices – Binaural and stereophonic
Patent
1982-04-08
1983-12-06
Witkowski, Stanley J.
Electrical audio signal processing systems and devices
Binaural and stereophonic
84 109, 84 113, 84 116, 84 126, 84 127, 84 108, 381118, G01H 146
Patent
active
044185995
ABSTRACT:
An electrical sound output signal from an acoustical-electrical or piezo electric transducer instrument is made available at selectively switched high and low signal levels by level control apparatus utilizing bistable switching of first and second attenuated electrical sound output signals. A flip-flop circuit toggles between first and second states in response to an input signal pulse generated by actuation of a footswitch. Oppositely-phased output signals produced by the flip-flop are applied to first and second switching FETs controlled thereby so as to be alternately conducting. The FETs are connected between respective first and second attenuators providing high and low level-controlled sound output signals and common output terminals. Accordingly, upon selective actuation of the footswitch, either high or low level controlled sound output signals can be made available at the output terminals. The transition rate of the FET control signals is regulated by timing networks so as to eliminate "dead space" during switching. A signal level indicator is further included to permit user recognition of the level of the electrical sound output signal at the output terminals.
REFERENCES:
patent: Re29490 (1977-12-01), Shamma
patent: 3663735 (1972-05-01), Evans
patent: 3813473 (1974-05-01), Terymenko
patent: 4151775 (1979-05-01), Merriman
patent: 4248123 (1981-02-01), Bunger et al.
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