Patent ID: 11862182
Assignee: FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 9:
10. A method for audio decoding, comprising:
extracting a sequence of frequency-domain coefficients relating to a frame of an audio signal from a data stream;
extracting scale factors for the frame from the data stream;
subjecting the frequency-domain coefficients, scaled according to scale factors, to inverse transformation to obtain a time-domain portion of the audio signal; and
subjecting the time-domain portion to an overlap-add process to obtain the audio signal,
wherein the subjection to inverse transformation is responsive to a signalization within the data stream for the frame so as to, depending on the signalization, comprise:
forming one transform out of the sequence of frequency-domain coefficients by maintaining a sequential order of the frequency-domain coefficients in the sequence of frequency-domain coefficients and subjecting the one transform, scaled according to the scale factors, to an inverse transformation of a first transform length, or
forming more than one transform by de-interleaving the frequency-domain coefficients from the sequence of frequency-domain coefficients and subjecting, scaled according to the scale factors, each of the more than one transforms to an inverse transformation of a second transform length, shorter than the first transform length,
wherein the extraction of the frequency-domain coefficients and the extraction of the scale factors are performed so that a number of the sequence of frequency-domain coefficients and a number of the scale factors and an order at which the sequence of frequency-domain coefficients are extracted from the data stream and an order at which the scale factors are extracted from the data stream are independent from the signalization.