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    APPARATUS AND METHOD FOR ENCODING OR DECODING AN AUDIO SIGNAL USING A TRANSIENT-LOCATION DEPENDENT OVERLAP
    1.
    发明公开
    APPARATUS AND METHOD FOR ENCODING OR DECODING AN AUDIO SIGNAL USING A TRANSIENT-LOCATION DEPENDENT OVERLAP 审中-实审

    公开(公告)号：EP4375996A3

    公开(公告)日：2024-07-31

    申请号：EP24167580.0

    申请日：2014-02-20

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

    发明人： HELMRICH, Christian ,  LECOMTE, Jérémie ,  MARKOVIC, Goran ,  SCHNELL, Markus ,  EDLER, Bernd ,  REUSCHL, Stefan

    IPC分类号： G10L19/025

    CPC分类号： G10L19/022 ,  G10L19/0212

    摘要： A decoder for decoding an audio or image signal comprising a sequence of blocks of converted windowed samples and associated window information (160) identifying a specific window function for a block out of at least three different window functions, comprises: a processor (156) for providing a sequence of blocks of spectral values; a controllable converter (158) for converting the sequence of blocks of spectral values into a time domain representation using an overlap-add processing, wherein the controllable converter (158) is controlled by the window information to apply window functions indicated by the window information to the corresponding block to calculate a decoded audio or image signal, wherein the window is selected from a group of at least three windows comprising a first window (201) having a first overlap length (203), a second window (215) having a second overlap length (218), and a third window (224) having a third overlap length (229) or having no overlap, wherein the first overlap length (203) is greater than the second overlap length (218), and wherein the second overlap length (218) is greater than the third overlap length (229) or greater than an overlap of zero.

    CONCEPT FOR SWITCHING OF SAMPLING RATES AT AUDIO PROCESSING DEVICES
    4.
    发明公开
    CONCEPT FOR SWITCHING OF SAMPLING RATES AT AUDIO PROCESSING DEVICES 审中-公开

    公开(公告)号：EP4328908A2

    公开(公告)日：2024-02-28

    申请号：EP24151606.1

    申请日：2015-08-14

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

    发明人： DÖHLA, Stefan ,  FUCHS, Guillaume ,  GRILL, Bernhard ,  MULTRUS, Markus ,  PIETRZYK, Grzegorz ,  RAVELLI, Emmanuel ,  SCHNELL, Markus

    IPC分类号： G10L19/16

    摘要： Audio decoder device for decoding a bitstream, the audio decoder device comprising:
    a predictive decoder for producing a decoded audio frame from the bitstream, wherein the predictive decoder comprises a parameter decoder for producing one or more audio parameters for the decoded audio frame from the bitstream and wherein the predictive decoder comprises a synthesis filter device for producing the decoded audio frame by synthesizing the one or more audio parameters for the decoded audio frame;
    a memory device comprising one or more memories, wherein each of the memories is configured to store a memory state for the decoded audio frame, wherein the memory state for the decoded audio frame of the one or more memories is used by the synthesis filter device for synthesizing the one or more audio parameters for the decoded audio frame; and
    a memory state resampling device configured to determine the memory state for synthesizing the one or more audio parameters for the decoded audio frame, which has a sampling rate, for one or more of said memories by resampling a preceding memory state for synthesizing one or more audio parameters for a preceding decoded audio frame, which has a preceding sampling rate being different from the sampling rate of the decoded audio frame, for one or more of said memories and to store the memory state for synthesizing of the one or more audio parameters for the decoded audio frame for one or more of said memories into the respective memory.

    PROCESSOR, METHOD AND COMPUTER PROGRAM FOR PROCESSING AN AUDIO SIGNAL USING TRUNCATED ANALYSIS OR SYNTHESIS WINDOW OVERLAP PORTIONS
    9.
    发明公开
    PROCESSOR, METHOD AND COMPUTER PROGRAM FOR PROCESSING AN AUDIO SIGNAL USING TRUNCATED ANALYSIS OR SYNTHESIS WINDOW OVERLAP PORTIONS 审中-公开

    公开(公告)号：EP3584792A1

    公开(公告)日：2019-12-25

    申请号：EP19189446.8

    申请日：2015-07-24

    申请人： FRAUNHOFER-GESELLSCHAFT zur Förderung der angewandten Forschung e.V.

    发明人： FUCHS, Guillaume ,  MULTRUS, Markus ,  NEUSINGER, Matthias ,  NIEDERMEIER, Andreas ,  SCHNELL, Markus

    IPC分类号： G10L19/025

    摘要： A processor for processing an audio signal (200), comprises: an analyzer (202) for deriving a window control signal (204) from the audio signal (200) indicating a change from a first asymmetric window (1400) to a second window (1402), or indicating a change from a third window (1450) to a fourth asymmetric window (1452), wherein the second window (1402) is shorter than the first window (1400), or wherein the third window (1450) is shorter than the fourth window (1452); a window constructor (206) for constructing the second window (1402) using a first overlap portion (800) of the first asymmetric window (1400), wherein the window constructor (206) is configured to determine a first overlap portion (1000) of the second window (1402) using a truncated first overlap portion of the first asymmetric window, or wherein the window constructor is configured to calculate a second overlap portion (1330) of the third window (1450) using a truncated second overlap portion (814) of the fourth asymmetric window (1452); and a windower (208) for applying the first and second windows or the third and fourth windows to obtain windowed audio signal portions (210).