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

Claim 10:
11. A method for audio encoding, comprising:
subjecting time-domain portions of an audio signal to transformation to obtain, for each time-domain portion, frequency-domain coefficients;
inversely scaling the frequency-domain coefficients according to scale factors;
switching for a predetermined frame between:
performing one transform of a first transform length, and
performing more than one transform of a second transform length, shorter than the first transform length;

signaling the switching by a signalization for the predetermined frame within the data stream;
arranging, for the predetermined frame, the frequency-domain coefficients, inversely scaled according to scale factors, at a sequential order so as to obtain a sequence of frequency-domain coefficients by, depending on the signalization,
sequentially arranging the frequency-domain coefficients of the one transform in case of one transform performed for the respective frame, and
by interleaving the frequency-domain coefficients of the more than one transform of the respective frame in case of more than one transform performed for the respective frame, so that spectrally corresponding frequency-domain coefficients of the more than two transforms immediately follow each other; and

inserting the sequence of frequency domain coefficients and scale factors into the data stream so that the sequence of frequency-domain coefficients and the scale factors are inserted into data stream 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 inserted the data stream and an order at which the scale factors are inserted into the data stream are independent from the signalization.