Low voltage programmable compressor

Details Low voltage programmable compressor Low voltage programmable compressor

1988-02-23

1989-11-21

Chin, Tommy P.

Electrical audio signal processing systems and devices

Including amplitude or volume control

With amplitude compression/expansion

455 72, H04R 2900, H04R 164

Patent

active

048827614

ABSTRACT:
A programmable low voltage compressor circuit suitable for use with hearing aids is described. The compressor has a continuously variable compression ratio wherein the gain of the compressor may be programmably controlled over a wide range and the compressor may be powered from a power source as low as 1.1 volt. The compressor employs a variolosser wherein the gain is controlled by the ratio of the currents flowing out of first and second control terminals. A control circuit coupled to the variolosser controls the magnitude of the currents flowing out of the two control terminals. The control circuit includes a peak detector which generates a signal related to the peak positive envelope of the signal input to the compressor. A voltage to current converter is coupled to the peak detector for increasing the magnitude of the current flowing out of one of the control terminals of the variolosser as the voltage output of the peak detector increases. Furthermore, the gain and compression ratio of the compressor over a wide range is programmably controllable.

REFERENCES:
patent: 3784750 (1974-01-01), Stearns
patent: 4068092 (1978-01-01), Ikoma
patent: 4253072 (1981-02-01), Fisher
patent: 4696044 (1987-09-01), Waller
Signal Processing to Improve Speech Intelligibilty in Perceptive Deafness, by Edgar Villchur, The Journal of the Acoustical Society of America, pp. 1646-1657, vol. 53, No. 6, 1973.
Widlar, R. T., "A New Breed of Linear IC's Runs at 1 Volt Levels", Electronics, Mar. 29, 1979, p. 115.

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