Patent ID: 7447631

Claim:
A method for generating audio information, wherein the method comprises: receiving an input signal and obtaining therefrom a set of subband signals each having one or more spectral components representing spectral content of an audio signal; identifying within the set of subband signals a particular subband signal in which one or more spectral components have a non-zero value and in which one or more of the spectral components have a zero value; deriving a scaling envelope from the one or more spectral components that have non-zero values, wherein the scaling envelope varies at a rate substantially equal to a rate of roll off of spectral leakage between adjacent subband signals of a synthesis filterbank; generating one or more synthesized spectral components that correspond to zero-valued spectral components in the particular subband signal and that are scaled according to the scaling envelope; generating a modified set of subband signals by substituting the synthesized spectral components for corresponding zero-valued spectral components in the particular subband signal; and generating the audio information by applying the synthesis filterbank to the modified set of subband signals.