Frequency domain audio coding supporting transform length switching

摘要

SOLUTION: In a frequency-domain audio decoder 10, a data stream 20 transmits the frequency-domain coefficients 24 of a respective frame in an interleaved manner irrespective of the signalization signaling for the frames 26 as to which transform length actually applies. The frequency-domain coefficient extraction and the scale factor extraction operate independent from the signalization, whereby frequency-domain audio codec is provided with the function of supporting a certain transform length in a backward-compatible manner.EFFECT: Old-fashioned frequency-domain audio coders/decoders, insensitive for the signalization, 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.SELECTED DRAWING: Figure 1