Patent ID: 7283955

Claim:
Method for generating an up-sampled version of a time discrete audio signal, the audio signal being sampled at a first sampling rate, comprising the following steps: providing an analysed version of the audio signal, the analysed version including L analysis subband signals obtained by an L-channel analysis filter bank, wherein L designates a number of filter bank channels of the L-channel analysis filter bank; filtering the analysed version of the audio signal using a QL-channel synthesis filter bank having L-low-band channels and L (Q−1) high band channels to obtain the up-sampled version of the time discrete audio signal, the up-sampled version having a second sampling rate being equal to the first sampling rate multiplied by Q, wherein Q designates a factor, wherein, in the step of filtering, only the L low-band channels of the synthesis filter bank are used so that the upsampled version of the audio signal has the same bandwidth as the audio signal, or wherein, before the step of filtering, a number of subband signals on the L low band channels are patched to a number of high band channels so that the upsampled version of the audio signal has an extended bandwidth.