| 摘要 |
The present invention relates to methods, a postfilter and a postfilter control to be associated with a postfilter for improving perceived quality of speech reconstructed at a speech decoder. The postfilter control comprises means for measuring stationarity of a speech signal by determining a spectral distance between adjacent frames of the speech signal reconstructed at a decoder, means for determining a coefficient to a postfilter attenuation control parameter based on the measured stationarity, and means for transmitting the determined coefficient to a postfilter, such that the postfilter can process the reconstructed speech signal by applying the determined coefficient to the postfilter attenuation control parameter to obtain an enhanced speech signal, wherein the spectral distance between adjacent frames is determined as a line spectral frequencies distance. |
