Patent ID: 9735750
Date: 2017-08-15
CPC Classifications: G10L,H03G

Claim:
1. A system configured to generate a time stretched and/or frequency transposed signal from an input signal, the system comprising: an analysis filter bank configured to derive a number Y≧1 of analysis subband signals from the input signal, wherein each analysis subband signal comprises a plurality of complex-valued analysis samples, each having a phase and a magnitude; a subband processing unit configured to generate a synthesis subband signal from the Y analysis subband signals using a subband transposition factor Q and a subband stretch factor S, at least one of Q and S being greater than one, wherein the subband processing unit comprises: a block extractor configured to: a nonlinear frame processing unit configured to generate, on the basis of Y corresponding frames of input samples formed by the block extractor, a frame of processed samples by determining a phase and magnitude for each processed sample of the frame, wherein, for at least one processed sample: a synthesis filter bank configured to generate the time stretched and/or frequency transposed signal from the synthesis subband signal, wherein the system is operable at least for Y=2.