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

    公开(公告)号：EP3739580A1

    公开(公告)日：2020-11-18

    申请号：EP20185071.6

    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： G10L19/24 ,  G10L19/04 ,  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.

    Encoder, decoder, system and methods for encoding and decoding
    6.
    发明公开
    Encoder, decoder, system and methods for encoding and decoding 审中-公开
    Codierer，Decodierer，System und Verfahren zur Codierung und Decodierung

    公开(公告)号：EP2980793A1

    公开(公告)日：2016-02-03

    申请号：EP14178780.4

    申请日：2014-07-28

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

    发明人： Fuchs, Guillaume ,  Schubert, Benjamin ,  Pietrzyk, Grzegorz ,  Multrus, Markus ,  Grill, Bernhard

    IPC分类号： G10L19/035 ,  H04N19/124

    CPC分类号： H04N19/126 ,  G10L19/035 ,  H04N19/13 ,  H04N19/184 ,  H04N19/44 ,  H04N19/70 ,  H04N19/91

    摘要： Embodiments of the present invention provide an encoder comprising a quantization stage, an entropy encoder, a residual quantization stage and a coded signal former. The quantization stage is configured to quantize an input signal using a dead zone in order to obtain a plurality of quantized values. The entropy encoder is configured to encode the plurality of quantized values using an entropy encoding scheme in order to obtain a plurality of entropy encoded values. The residual quantization stage is configured to quantize a residual signal caused by the quantization stage, wherein the residual quantization stage is configured to determine at least one quantized residual value in dependence on the dead zone of the quantization stage. The coded signal former is configured to form a coded signal from the plurality of entropy encoded values and the at least one quantized residual value.

    摘要翻译： 本发明的实施例提供一种编码器，包括量化级，熵编码器，残余量化级和编码信号形成器。 量化级被配置为使用死区对输入信号进行量化，以获得多个量化值。 熵编码器被配置为使用熵编码方案对多个量化值进行编码，以便获得多个熵编码值。 剩余量化级被配置为量化由量化级引起的残留信号，其中残留量化级被配置为根据量化级的死区来确定至少一个量化剩余值。 编码信号形成器被配置为从多个熵编码值和至少一个量化剩余值形成编码信号。

    METHOD AND APPARATUS FOR PROCESSING AN AUDIO SIGNAL, COMPUTER READABLE MEDIUM AND AUDIO DECODER
    7.
    发明公开
    METHOD AND APPARATUS FOR PROCESSING AN AUDIO SIGNAL, COMPUTER READABLE MEDIUM AND AUDIO DECODER 审中-公开

    公开(公告)号：EP4447048A2

    公开(公告)日：2024-10-16

    申请号：EP24198100.0

    申请日：2015-07-03

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

    发明人： Ravelli, Emmanuel ,  Jander, Manuel ,  Pietrzyk, Grzegorz ,  Dietz, Martin ,  Gayer, Marc

    IPC分类号： G11B27/038

    摘要： A method for processing an audio signal (100) includes receiving an encoded audio signal and generating a decoded audio signal by processing consecutive audio frames of the audio signal to avoid discontinuities. Processing consecutive audio frames of the audio signal to avoid discontinuities includes using linear predictive filtering for removing (S102, S104, S300-S308, S400-S402) a discontinuity (106a, 106b) between a filtered past frame and a filtered current frame of the audio signal. The method includes filtering the current frame of the audio signal and removing the discontinuity by modifying a beginning portion of the filtered current frame by a signal obtained by linear predictive filtering a predefined signal with initial states of the linear predictive filter defined on the basis of a last part of the unfiltered past frame filtered using the set of filter parameters for filtering the current frame.

    Audio decoder, method and computer program using a zero-input-response to obtain a smooth transition
    10.
    发明公开
    Audio decoder, method and computer program using a zero-input-response to obtain a smooth transition 审中-公开
    音频解码器，方法和计算机程序的零输入响应，以产生平滑的过渡

    公开(公告)号：EP2980797A1

    公开(公告)日：2016-02-03

    申请号：EP14178830.7

    申请日：2014-07-28

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

    发明人： Ravelli, Emmanuel ,  Fuchs, Guillaume ,  Disch, Sascha ,  Multrus, Markus ,  Pietrzyk, Grzegorz ,  Schubert, Benjamin

    IPC分类号： G10L19/20

    CPC分类号： G10L19/20 ,  G10L19/02 ,  G10L19/12

    摘要： An audio decoder (100;200;300) for providing a decoded audio information (112;212;312) on the basis of an encoded audio information (110;210;310), the audio decoder comprises a linear-prediction-domain decoder (120;220;320) configured to provide a first decoded audio information (122;222;322; S C (n)) on the basis of an audio frame encoded in a linear prediction domain, a frequency domain decoder (130;230;330) configured to provide a second decoded audio information (132;232;332; S M (n)) on the basis of an audio frame encoded in a frequency domain, and a transition processor (140;240;340).The transition processor is configured to obtain a zero-input-response (150; 256;348) of a linear predictive filtering(148; 254; 346), wherein an initial state (146;252;344) of the linear predictive filtering is defined in dependence on the first decoded audio information and the second decoded audio information. The transition processor is also configured to modify the second decoded audio information (132; 232;332;S M (n)), which is provided on the basis of an audio frame encoded in the frequency domain following an audio frame encoded in the linear prediction domain, in dependence on the zero-input-response, to obtain a smooth transition between the first decoded audio information (S C (n)) and the modified second decoded audio information ( S M ^ n ).

    摘要翻译： 音频解码器（100; 200; 300），用于提供已解码音频信息的编码音频信息的基础上（112; 312; 212）（110; 210; 310），所述音频解码器包括线性预测域解码器 （120; 220; 320）被配置为提供一个第一解码的音频信息（122; SC（N）222; 322）; 230线性预测域，频域解码器（130编码的音频帧的基础上; 330）被配置为提供第二经解码的音频信息（132; 232; 332; SM（N））在频域编码的音频帧，以及过渡处理器（140的基础上; 240; 340）。该过渡处理器 被配置为获得一个零输入响应（; 254; 346 148），worin到初始化状态的线性预测滤波（150; 348; 256）（146; 252; 344）的线性预测滤波的依赖被定义 在第一解码的音频信息和第二解码的音频信息。 过渡处理器被如此配置以修改所述第二解码的音频信息（132; 232; 332; SM（N）），所有这些都设置在频域中编码的音频帧的基础上继在所述线性预测编码的音频帧 域，在该零输入响应的依赖性，以获得第一解码的音频信息之间和所述修改后的第二解码的音频信息（SM ^ N）的平滑过渡（（SC n））的。