Electrical audio signal processing systems and devices – Hearing aids – electrical – Wideband gain control
Patent
1995-10-19
1998-11-17
Le, Huyen
Electrical audio signal processing systems and devices
Hearing aids, electrical
Wideband gain control
381312, 381106, H04R 2500
Patent
active
058388079
ABSTRACT:
An improved analog hearing aid is provided which incorporates a current source transconductance amplifier as an input stage. The gain defining bias current of the input stage transconductance amplifier is adjusted upon the application of battery power to the hearing aid to define a low input signal gain, and is then reduced by two gain regulators to define a compression threshold and compression ratio, and to provide a maximum output ceiling. Also provided is a method of trimming the low signal gain of the hearing aid at the time battery power is applied.
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Andersson Olle
Negahban Mehrdad
Weiland Jonas
Le Huyen
Mitel Semiconductor, Inc.
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