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    • 8. 发明专利
    • Device and method for postprocessing spectral values and encoder and decoder for audio signals
    • AU2011200509B2
    • 2011-12-08
    • AU2011200509
    • 2011-02-07
    • FRAUNHOFER GES FORSCHUNG
    • BERND EDLERCHRISTIAN ERTELHARALD POPPJOHANNES HILPERTRALF GEIGER
    • G10L19/02G10L19/00G10L19/14G10L19/24G10L19/26
    • DEVICE AND METHOD FOR POSTPROCESSING SPECTRAL VALUES AND ENCODER AND DECODER FOR AUDIO SIGNALS Abstract For postprocessing spectral values which are based on a first transformation algorithm (16) for converting the audio signal into a spectral representation, first a sequence of blocks of the spectral values represent ing a sequence of blocks of samples of the audio signal are provided (12). Hereupon, a weighted addition (13) of spectral values of the sequence of blocks of spectral values is performed in order to obtain a se quence of blocks of postprocessed spectral values, wherein the combination is performed such that for calculating a postprocessed spectral value for a frequency band and a time duration a spectral value of the sequence of blocks for the frequency band and the time duration and a spectral value for another fre quency band or another time duration are used, wherein the combination is further performed such that such weighting factors are used that the postprocessed spectral values are an approximation to the spectral values as they are obtained by converting the audio signal into a spectral representation using a second transformation algorithm (17) which is different from the first transformation algorithm. The first trans formation algorithm and the second transformation algorithm are so that they provide real output signals. The postprocessed spectral values are in particular used for a difference formation within a scalable en coder or for an addition within a scalable decoder, respectively. 3327658-1