Hearing aid device incorporating signal processing techniques
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United States of America Patent
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Apr 26, 2005
Issued Date -
N/A
app pub date -
Nov 22, 1999
filing date -
Jul 8, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hearing compensation system for the hearing impaired comprises a plurality of bandpass filters having an input connected to an input transducer and each bandpass filter having an output connected to the input of one of a plurality of multiplicative AGC circuits whose outputs are summed together and connected to the input of an output transducer. The multiplicative AGC circuits attenuate acoustic signals having a constant background level without the loss of speech intelligibility. The identification of the background noise portion of the acoustic signal is made by the constancy of the envelope of the input signal in each of the several frequency bands. The background noise that will be suppressed includes multi-talker speech babble, fan noise, feedback whistle, florescent light hum, and white noise.
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