H - Electricity – 03 – H
Patent
H - Electricity
03
H
349/26, 333/51
H03H 11/04 (2006.01) H03H 11/12 (2006.01) H03H 17/02 (2006.01) H04R 25/00 (2006.01)
Patent
CA 1335674
An electronic filter for filtering an electrical signal. Signal processing circuitry therein includes a logarithmic filter having a series of filter stages with inputs and outputs in cascade and respective circuits asso- ciated with the filter stages for storing electrical repre- sentations of filter parameters. The filter stages include circuits for respectively adding the electrical representa- tions of the filter parameters to the electrical signal to be filtered thereby producing a set of filter sum signals. At least one of the filter stages includes circuitry for producing a filter signal in substantially logarithmic form at its output by combining a filter sum signal for that filter stage with a signal from an output of another filter stage. The signal processing circuitry produces an inter- mediate output signal, and a multiplexer connected to the signal processing circuit multiplexes the intermediate output signal with the electrical signal to be filtered so that the logarithmic filter operates as both a logarithmic prefilter and a logarithmic postfilter. Other electronic filters, signal conversion apparatus, electroacoustic sys- tems, hearing aids and methods are also disclosed.
595860
Engebretson A. Maynard
Engel George L.
Morley Robert E. Jr.
Sullivan Thomas J.
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