Patent ID: 8886346

Claim:
A system configured to generate a high frequency component of an audio signal from a low frequency component of the audio signal, comprising: an analysis filter bank comprising an analysis transformation unit having a frequency resolution of Δf; and an analysis window having a duration of D A ; the analysis filter bank being configured to provide a set of analysis subband signals from the low frequency component of the signal; a nonlinear processing unit configured to determine a set of synthesis subband signals based on a portion of the set of analysis subband signals, wherein the portion of the set of analysis subband signals is phase shifted by a transposition order T; and a synthesis filter bank comprising a synthesis transformation unit having a frequency resolution of QΔf; and a synthesis window having a duration of D S ; the synthesis filter bank being configured to generate the high frequency component of the signal from the set of synthesis subband signals; wherein Q is a frequency resolution factor with Q≧1 and smaller than the transposition order T; and wherein the value of the product of the frequency resolution Δf and the duration D A of the analysis filter bank is selected based on the frequency resolution factor Q.