FREQUENCY-DOMAIN AUDIO CODING SUPPORTING TRANSFORM LENGTH SWITCHING Russian patent published in 2018 - IPC G10L19/22 H03M7/30 

FIELD: data processing.

SUBSTANCE: invention relates to frequency-domain audio coding supporting transform length switching. To this end, frequency-domain coefficients of a respective frame are transmitted in an interleaved manner irrespective of the signalisation, signaling for the frames as to which transform length actually applies, and additionally the frequency-domain coefficient extraction and the scale factor extraction operate independent from the signalisation. Therefore, old-fashioned frequency-domain audio coders/decoders, insensitive for the signalisation, would be able to nevertheless operate without faults and with reproducing a reasonable quality. Concurrently, frequency-domain audio coders/decoders able to support the additional transform length would offer even better quality despite the backward compatibility. As far as coding efficiency penalties due to the coding of the frequency domain coefficients in a manner transparent for older decoders are concerned, same are of comparatively minor nature due to the interleaving.

EFFECT: providing the possibility of supporting additional transform length.

13 cl, 5 dwg, 2 tbl