Electrical audio signal processing systems and devices – Hearing aids – electrical – Wideband gain control
Reexamination Certificate
2005-04-26
2005-04-26
Le, Huyen (Department: 2643)
Electrical audio signal processing systems and devices
Hearing aids, electrical
Wideband gain control
C381S312000, C381S320000, C381S106000, C381S098000, C455S232100, C455S235100, C455S306000
Reexamination Certificate
active
06885752
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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Borough William Charles
Chabries Douglas Melvin
Christiansen Richard Wesley
Hammond Aaron Michael
Brigham Young University
Harvey Dionne
Le Huyen
Ritchie David B.
Thelen Reid & Priest LLP
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