Apparatus for and method of filtering in an digital hearing aid, including an application specific integrated circuit and a programmable digital signal processor
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United States of America Patent
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May 29, 2001
Grant Date -
N/A
app pub date -
Apr 16, 1998
filing date -
Apr 16, 1997
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Abstract
An apparatus for a hearing aid provides an application specific integrated circuit (ASIC) for filtering of input signals and a programmable digital signal processor connected to it, for control of filterbank gains. This provides a compromise between the conflicting goals of size, re-programmability and power consumption. The fixed portion of the processing, i.e. filtering is implemented in hardware in the ASIC, and the variable or adjustable portion of the processing is implemented by the programmable digital signal processor. The filterbank has an adjustable number of channels and means for shifting the center frequencies of the bands in unison to one of two discrete sets of center frequencies. A wide range of hearing loss compensation schemes can be implemented. Software programs can be executed on the programmable digital signal processor.
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