Hearing aids using single side band clipping with output compression AMP
Patent 4156116 Issued on May 22, 1979. Estimated Expiration Date: 
March 27, 1998. 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.
March 27, 1998. 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 ReferencesHearing aid with amplitude compression achieved by clipping a modulated signal Patent #: 4052571 InventorApplicationNo. 05/890069 filed on 03/27/1978US Classes:381/317, Noise compensation circuit381/106With amplitude compression/expansionExaminersPrimary: Stellar, George G.Attorney, Agent or FirmInternational ClassesH03G 11/00 (20060101)H04R 25/00 (20060101) AbstractA hearing aid apparatus employs a single side band modulator which serves to convert an audio band of frequencies into an upper and lower side band signal. One of the side band signals is filtered and clipped. The clipped side band signal is then demodulated to provide an output audio signal relatively free of undesirable low frequency peaks. The output audio signal is then applied to a compressor amplifier circuit for application to the ear of a handicapped user. | |
