Patent ID: 11894002
Assignee: FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. Audio decoder comprising an apparatus for processing a time discrete input audio signal, comprising:
a synthesis filterbank comprising a synthesis filterbank input, wherein the synthesis filterbank is configured
to receive, at the synthesis filterbank input, a plurality of time discrete first subband signals representing the time discrete input audio signal and having been generated by an analysis filterbank, and
to synthesize an audio intermediate signal from the plurality of time discrete first subband signals representing the time discrete input audio signal and to output the audio intermediate signal,
wherein a number of channels of the synthesis filterbank is smaller than a number of channels of the analysis filterbank; and

a further analysis filterbank comprising a further analysis filterbank input, wherein the further analysis filterbank is configured
to receive, at the further analysis filterbank input, the audio intermediate signal output by the synthesis filterbank, and
to generate a plurality of time discrete second subband signals from the audio intermediate signal and to output the plurality of time discrete second subband signals,
wherein the further analysis filterbank comprises a number of channels being different from the number of channels of the synthesis filterbank, or
wherein a sampling rate of a time discrete subband signal of the plurality of time discrete second subband signals is different from a sampling rate of a time discrete first subband signal of the plurality of time discrete first subband signals.