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US 4,882,762 AGranted
Multi-band programmable compression system
AssigneeResound Corporation
InventorFred D. Waldhauer
Life of this patent
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AssigneeResound Corporation
InventorFred D. Waldhauer
Estimating the term…
A 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.
A multi-band compression system comprising means for receiving an audio signal, band split filter means coupled to said receiving means for separating said received audio signal into a plurality of frequency bands, a plurality of compressor means, each of said compressor means being coupled to said band split filter means for compressing a respective one of said frequency bands, summing means coupled to the output of each of said compressor means for combining said respective compressed frequency bands and generating a composite audio signal, means responsive to a first set of control signals for setting the compression ratio of each of said compressor means to a preselected separate value, and means responsive to a second set of control signals for setting the average gain of each of said compressor means to a preselected level independently of the others of said compressor means, wherein said means responsive to said first and second control signals provides frequency response equalization of said composite audio signal.
An improved low voltage multiband compression system for implementation on an integrated circuit and adapted for operation at voltages as low as 1 volt comprising:
A method of processing an audio signal comprising:
Dependencies are inferred from the claim text.