Decoder for generating a frequency enhanced audio signal, method of decoding, encoder for generating an encoded signal and method of encoding using compact selection side information

摘要

Abstract A decoder for generating a frequency enhanced audio signal, comprising: a feature extractor for extracting a feature from a core signal; a side information extractor for extracting a selection side information associated with the core signal; a parameter 5 generator for generating a parametric representation for estimating a spectral range of the frequency enhanced audio signal not defined by the core signal, wherein the parameter generator is configured to provide a number of parametric representation alternatives in response to the feature, and wherein the parameter generator is configured to select one of the parametric representation alternatives as the parametric representation in response 10 to the selection side information; and a signal estimator for estimating the frequency enhanced audio signal using the parametric representation selected, wherein the selection side information comprises a number N of bits per frame of the core signal, wherein the parameter generator is configured to provide, at the most, an amount of parametric representation alternatives being equal to 2N. Figure 1 core signal feature parameter generator extractor feature with statistical model 100----- ---- - provide number 112 of alternatives selection using feature side info - select alternative side info (using side info extractor 116, parametric 110 representation signal estimator adding additional frequency content enhanced audio signal encoded 200core input signal core decoded encoded interface decoder core signal input 201 signal selection side info to parameter generator