Electrical audio signal processing systems and devices – Hearing aids – electrical – Remote control – wireless – or alarm
Patent
1997-06-06
2000-08-01
Kuntz, Curtis A.
Electrical audio signal processing systems and devices
Hearing aids, electrical
Remote control, wireless, or alarm
318313, H04R 2500
Patent
active
060978244
ABSTRACT:
An improved multiband audio compressor is well behaved for both wide band and narrow band signals, and shows no undesirable artifacts at filter crossover frequencies. The compressor includes a heavily overlapped filter bank, which is the heart of the present invention. The filter bank filters the input signal into a number of heavily overlapping frequency bands. Sufficient overlapping of the frequency bands reduces the ripple in the frequency response, given a slowly swept sine wave input signal, to below about 2 dB, 1 dB, or even 0.5 dB or less with increasing amount of overlap in the bands. Each band is fed into a power estimator, which integrates the power of the band and generates a power signal. Each power signal is passed to a dynamic range compression gain calculation block, which calculates a gain based upon the power signal. Each band is multiplied by its respective gain in order to generate scaled bands. The scaled bands are then summed to generate an output signal.
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Lindemann Eric
Worrall Thomas Lee
AudioLogic, Incorporated
Bales Jennifer L.
Harvey Dionne N.
Kuntz Curtis A.
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