Patent ID: 6757396
Filing Date: 2004-06-29
Classification: H03G

Abstract:
A digital audio dynamic range compressor, comprising:an attribute estimator receiving an audio input sample and operable to estimate a predetermined attribute having an absolute value calculator receiving the first and second audio input samples and operable to compute the absolute values thereof and an alpha filter receiving the absolute values and generating y(n)=y(nâˆ’1)+&agr;[x(n)âˆ’y(nâˆ’1)]where:x(n)=input to the filter, y(n)=output from the filter, &agr;=user-specified coefficient; a gain calculator receiving the estimated attribute and operable to determine a gain for the audio input sample in linear domain; a filter receiving the gain and operable to smooth the gain; and a multiplier receiving the smoothed gain and operable to multiply the audio input sample with the smoothed gain.