Patent ID: 8818541

Claim:
A system for generating a high frequency component of an audio signal from a low frequency component of the audio signal, comprising: an analysis filter bank providing a plurality of analysis subband signals of the low frequency component of the audio signal; a non-linear processing unit to generate a synthesis subband signal with a synthesis frequency by multiplying the phase of a first and a second of the plurality of analysis subband signals and by combining the phase-multiplied analysis subband signals; and a synthesis filter bank for generating the high frequency component of the audio signal from the synthesis subband signal; wherein the non-linear processing unit comprises a multiple-input-single-output unit of a first and second transposition order generating the synthesis subband signal from the first and the second analysis subband signals with a first analysis frequency ω and a second analysis frequency (ω+Ω), respectively; the first analysis subband signal is phase-multiplied by the first transposition order (T-r); the second analysis subband signal is phase-multiplied by the second transposition order r; T>1; 1≦r<T; and the synthesis frequency is (T−r)·ω+r·(ω+Ω).