multimode decoder for audio signal, multimode encoder for audio signal, method and computer program using a noise shaping based on linearity-prediction-encoding

摘要

A multimode decoder for audio signal (1100; 1200) to provide a decoded representation (1112; 1212) of an audio content based on a coded representation (1110; 1208) of the audio content, where the decoder to signal audio comprising: a determiner spectral value (1130; 1230a; 1230c) configured to obtain sets (1132, 1230D) of spectral coefficients decoded (1132; 1230D; r [i]) for a plurality of portions (1410, 1412, 1414 , 1416) of the audio content; a spectral processor (1230e; 1378) configured to apply a spectral shaping of a set (1132; 1230D; r [i]) of spectral coefficients decoded, or a pre-processed (1132 ') version, depending on a set of domain parameters for a linear prediction encoded portion of the content in the audio mode linear prediction, and to apply a spectral shaping to a set (1132; 1230D; r [i]) of spectral coefficients decoded, or a pre- version processed (1232 ') thereof, depending on a set of parameters of scale factors (1152; 1260b) for a portion (1410; 1416) of audio content encoded in the mode frequency domain, and one domain converter frequency to time domain (1160, 1230g) configured to obtain a time domain representation (1162; 1232; xi, n) of audio content on the basis of a spectrally shaped set (1158, 1230f) of spectral coefficients decoding ified to a portion of the content encoded in the audio mode linear prediction, and to obtain a time domain representation (1162; 1232) of the audio content based on a modeled spectrally set of spectral coefficients decoded for a portion of audio content encoded in the frequency domain mode.