Electrical audio signal processing systems and devices – Hearing aids – electrical – Specified casing or housing
Patent
1993-04-07
1998-01-06
Tran, Sinh
Electrical audio signal processing systems and devices
Hearing aids, electrical
Specified casing or housing
381 68, 381 682, 381106, H04R 2500
Patent
active
057063524
ABSTRACT:
Adaptive compressive gain and level dependent spectral shaping circuitry for a hearing aid include a microphone to produce an input signal and a plurality of channels connected to a common circuit output. Each channel has a preset frequency response. Each channel includes a filter with a preset frequency response to receive the input signal and to produce a filtered signal, a channel amplifier to amplify the filtered signal to produce a channel output signal, a threshold register to establish a channel threshold level, and a gain circuit. The gain circuit increases the gain of the channel amplifier when the channel output signal falls below the channel threshold level and decreases the gain of the channel amplifier when the channel output signal rises above the channel threshold level. A transducer produces sound in response to the signal passed by the common circuit output.
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Engebretson A. Maynard
O'Connell Michael P.
K/S HIMPP
Tran Sinh
LandOfFree
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