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    CODER USING FORWARD ALIASING CANCELLATION
    66.
    发明公开
    CODER USING FORWARD ALIASING CANCELLATION 审中-实审

    公开(公告)号：EP4372742A2

    公开(公告)日：2024-05-22

    申请号：EP24167822.6

    申请日：2011-07-07

    申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

    发明人： LECOMTE, Jérémie ,  WARMBOLD, Patrick ,  BAYER, Stefan

    IPC分类号： G10L19/02

    CPC分类号： G10L19/005 ,  G10L19/0212 ,  G10L19/20 ,  G10L19/04

    摘要： A codec supporting switching between time-domain aliasing cancellation transform coding mode and time-domain coding mode is made less liable to frame loss by adding a further syntax portion to the frames, depending on which the parser of the decoder may select between a first action of expecting the current frame to comprise, and thus reading forward aliasing cancellation data from the current frame and a second action of not-expecting the current frame to comprise, and thus not reading forward aliasing cancellation data from the current frame. In other words, while a bit of coding efficiency is lost due to the provision of the new syntax portion, it is merely the new syntax portion which provides for the ability to use the codec in case of a communication channel with frame loss. Without the new syntax portion, the decoder would not be capable of decoding any data stream portion after a loss and will crash in trying to resume parsing. Thus, in an error prone environment, the coding efficiency is prevented from vanishing by the introduction of the new syntax portion.

    FREQUENCY-DOMAIN AUDIO CODING SUPPORTING TRANSFORM LENGTH SWITCHING
    70.
    发明公开
    FREQUENCY-DOMAIN AUDIO CODING SUPPORTING TRANSFORM LENGTH SWITCHING 审中-实审

    公开(公告)号：EP4369337A2

    公开(公告)日：2024-05-15

    申请号：EP24165597.6

    申请日：2014-07-15

    申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

    发明人： Dick, Sascha ,  HELMRICH, Christian ,  Hölzer, Andreas

    IPC分类号： G10L19/03

    CPC分类号： G10L19/03 ,  G10L19/022 ,  G10L19/008 ,  G10L19/028

    摘要： A frequency-domain audio codec is provided with the ability to additionally support a certain transform length in a backward-compatible manner, by the following: the frequency-domain coefficients of a respective frame are transmitted in an interleaved manner irrespective of the signalization 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 signalization. By this measure, 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. 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.