Power efficient hearing aid
May 5, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesUltra low current amplifier Loudness contour compensated hearing aid having ganged volume, bandpass filter, and compressor control Hearing aid with adjustable frequency response Hearing aid amplifier Programmable signal processing device Microphone with stepped response Digital hearing aid and method Prosthetic device for optimizing speech understanding through adjustable frequency spectrum responses Computerized audiometer Hearing aid InventorsAssigneeApplicationNo. 318039 filed on 03/02/1989US Classes:381/320, Spectral control330/279, And significant control voltage developing means381/120, WITH AMPLIFIER381/323Power supply or programming interface terminalsExaminersPrimary: Isen, Forester W.Assistant: McGeary, III, M. Nelson Attorney, Agent or FirmInternational ClassH04R 025/00AbstractA power efficient hearing aid uses a programmable biasing technique to set the quiescent operating points of amplifiers used by the hearing aid to avoid excessive power usage by the hearing aid. The hearing aid also includes power supply circuitry which develops +1.25 volts and -1.25 volts relative to ground from a single +1.25 volt source. The hearing aid also conserves power by selectively disabling low frequency signal processing channels in the presence of relatively large amplitude ambient noise.Other References
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