Perceptually improved encoding of acoustic signals

摘要

Encoding an acoustic source signal such that a signal z reconstructed from the encoded information has a perceptually high sound quality. The acoustic source signal is encoded into at least one basic coded signal that represents perceptually significant characteristics of the acoustic signal. The encoder can include at least one spectral smoothing unit which receives at least one of the signal components on which the basic coded signal is based and generates in response thereto a corresponding smoothed signal component. At least one enhanced coded signal is then produced from the corresponding smoothed signal. component for transmission. A receiver receives at least one estimate PE of the transmitted signal(s), and a spectral smoothing unit in the receiver produces, on basis of a primary spectrum Ŷ decoded from the at least one received estimate PE, a smoothed primary decoded spectrum ŶE. Finally, this signal ŶE is used to generate an enhanced estimate z of the acoustic source signal. ŶE.