Patent ID: 9076453
Filing Date: 2015-07-07
Classification: G10L

Abstract:
1. A method for controlling a postfilter for improving perceived quality of speech reconstructed at a speech decoder, the method comprises the steps of: measuring, using a processor, stationarity of a speech signal reconstructed at a decoder, by determining a spectral distance between adjacent frames of the speech signal, adaptively determining, using the processor, a coefficient to a postfilter control parameter, such that when the spectral distance is determined to be high, a degree of deemphasizing of spectral valleys in a spectral envelope of the reconstructed speech signal is reduced compared with a situation when the spectral distance is determined to be low, and transmitting, using the processor, the determined coefficient to the postfilter, such that the postfilter can process the reconstructed speech signal by applying the determined coefficient to the postfilter control parameter to obtain an enhanced speech signal.