Patent ID: 6766292
Filing Date: 2004-07-20
Classification: G10L

Abstract:
In a communication system for processing a communication signal comprising speech signal components due to speech and noise signal components due to noise, apparatus for enhancing the quality of the communication signal comprising:a filter arranged to divide the communication signal into a plurality of frequency band signals representing the speech signal components and the noise signal components in a plurality of frequency bands; and a calculator generating a plurality of weighting signals having weighting values corresponding to the frequency band signals, the weighting values derived from at least approximations of the normalized powers of the noise signal components in the frequency band signals, the weighting values varying monotonically with a first variation of the values of weight from a first value of weight at a first frequency to a second value of weight at a second frequency greater than the first frequency and the weighting values varying monotonically with a second variation of the values of weight opposite the first variation of the values of weight from the second value of weight to a third value of weight between the first value of weight and second value of weight at a frequency greater than the second frequency, combining the frequency band signals with the weighting signals to generate weighted frequency band signals, and combining the weighted frequency band signals to generate a communication signal with enhanced quality.