Multi-band programmable compression system
Patent 4882762 Issued on November 21, 1989. Estimated Expiration Date: 
February 23, 2008. 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.
February 23, 2008. 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 References 3784750 Voice control circuit Compandor with sampling and equalization Dynamic noise reduction with logarithmic control Patent #: 4696044 InventorAssigneeApplicationNo. 160023 filed on 02/23/1988US Classes:381/106, With amplitude compression/expansion455/72For compression and expansion of message signal (i.e., companding)ExaminersPrimary: Chin, Tommy P.Foreign Patent References
International ClassesH04R 029/00H04B 001/64 AbstractA programmable low voltage multi-band compression system suitable for use with hearing aids is described. Received audio signals are processed by a band split filter which separates the received audio signal into a plurality of frequency bands. A plurality of compressors coupled to the band split filter compresses each of the respective frequency bands. The output of the compressor are then summed to generate a composite audio signal. The compression ratio of each of the compressors is set, in response to a set of control signals, to a preselected independent value. The average gain of each of the compressors is set to a preselected level independently of the other compressors. In addition, the compression ratio of each compressor may vary with input signal level. Another set of control signals is employed for setting the gain of the compressor to provide a volume control function.Other References
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