| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. <P>SOLUTION: These improvements are accomplished by extraction of stereo-image describing parameters at an encoder side, which are transmitted and subsequently used for control of a stereo generator at a decoder side. The invention bridges a gap between simple pseudo-stereo methods and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, applications of this stereo-coding scheme in scalable HFR-based codecs are described. <P>COPYRIGHT: (C)2012,JPO&INPIT |
