Source coding enhancement using spectral-band replication

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.