H - Electricity – 03 – G
Patent
H - Electricity
03
G
H03G 3/20 (2006.01) H03G 7/08 (2006.01) H04R 25/00 (2006.01)
Patent
CA 2090531
ABSTRACT OF THE DISCLOSURE An audio compression system for a hearing aid. The audio compression system provides a variable gain amplifier for compensating for loudness recruitment. The audio compression system comprises an amplifier having a feedback circuit which includes a current controlled resistor. The gain of the amplifier is varied by using a gain controller to generate a variable current signal. The gain controller utilizies dual averaging detectors to determine the average energy in the amplifier output and generate a corresponding current signal. The averaging detectors are coupled to the output of the amplifier through a rectifier stage which rectifies the amplifer output. The averaging detectors include a slow averaging detector and a fast averaging detector. The slow averaging detector is normally in control, while the fast averaging signal is activated for loud signal levels. To compensate for non-linearity in the operation of the current controlled resistor, the audio compression system can include a pair of comparators which are coupled to the output of the amplifier. The comparators sense the amplifer output signal and provide a pair of symmetrical thresholds about the normal quiescent point of the amplifier output.
Bereskin & Parr
Gennum Corporation
LandOfFree
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