APPARATUS AND METHOD FOR SYNTHESIZING AN AUDIO SIGNAL FROM A PARAMETERIZED REPRESENTATION

An apparatus for modifying a parameterized representation having, for a time portion of an audio signal, band pass filter information for a plurality of band pass filters, the band pass filter information indicating time-varying band pass filter center frequencies of band pass filters having band widths, which depend on a band pass filter center frequency of the corresponding band pass filters, and having amplitude modulation or phase modulation or frequency modulation information for each band pass filter for the time portion of the audio signal, the modulation information being related to the center frequencies of the band pass filters, comprises: a modifier (160) for modifying the time varying center frequencies or for modifying the amplitude modulation or phase modulation or frequency modulation information and for generating a modified parameterized representation, in which the band widths of the band pass filters depend on the band pass filter center frequencies of the corresponding band pass filters, wherein the modifier (160) is operative to modify the amplitude modulation information or the phase modulation information or the frequency modulation information by a non-linear decomposition into a coarse structure and a fine structure and by only modifying either the coarse structure or the fine structure.