Electrical audio signal processing systems and devices – Including amplitude or volume control – Automatic
Patent
1995-09-11
1998-10-13
Chang, Vivian
Electrical audio signal processing systems and devices
Including amplitude or volume control
Automatic
381106, 381 684, 333 14, 330278, H03G 300
Patent
active
058224424
ABSTRACT:
An amplifier uses gain compression techniques to provide linear gain control over a wide dynamic range, and includes an amplifier having input and output legs, a gain controller coupled between the input and output legs of the amplifier, a gain control circuit having an input coupled to the amplifier output leg and output coupled to the gain controller. The gain controller is responsive to a gain control signal to permit continuous gain adjustment of the amplifier. The gain control circuit is configured to compare an output voltage on the amplifier output leg with a predetermined threshold voltage and to generate a gain control signal on the gain control circuit output so as to provide continuous gain adjustment of the amplifier at least when the amplifier output voltage is greater than the threshold voltage. A hearing aid using a single compression amplifier or multiple compression amplifiers to minimize sound distortion and enhance user comfort is also provided.
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"Understanding Digitally Programmable Hearing Aids" edited by R.E. Sandlin, Chapter 2, pp. 15, 28 and 31 (1994).
Agnew Jeremy A.
Wahl Jerry R.
Chang Vivian
Maioli Jay H.
Starkey Labs, Inc.
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