公开(公告)号：EP4243017A3

公开(公告)日：2023-11-08

申请号：EP23186418.2

申请日：2012-02-14

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

发明人： Ravelli, Emmanuel ,  Geiger, Ralf ,  Schnell, Markus ,  Fuchs, Guillaume ,  Ruoppila, Vesa ,  Bäckström, Tom ,  Grill, Bernhard ,  Helmrich, Christian

IPC分类号： G10L19/02 ,  G10L19/022 ,  G10L19/04 ,  G10L19/18

摘要： An apparatus for encoding an audio signal having a stream of audio samples 100 comprises: a windower 102 for applying a prediction coding analysis window 200 to the stream of audio samples to obtain windowed data for a prediction analysis and for applying a transform coding analysis window 204 to the stream of audio samples to obtain windowed data for a transform analysis, wherein the transform coding analysis window is associated with audio samples within a current frame of audio samples and with audio samples of a predefined portion of a future frame of audio samples being a transform-coding look-ahead portion 206, wherein the prediction coding analysis window is associated with at least the portion of the audio samples of the current frame and with audio samples of a predefined portion of the future frame being a prediction coding look-ahead portion 208, wherein the transform coding look-ahead portion 206 and the prediction coding look-ahead portion 208 are identically to each other or are different from each other by less than 20% of the prediction coding look-ahead portion 208 or less than 20% of the transform coding look-ahead portion 206; and an encoding processor 104 for generating prediction coded data for the current frame using the windowed data for the prediction analysis or for generating transform coded data for the current frame using the windowed data for the transform analysis.

公开(公告)号：EP4243017A2

公开(公告)日：2023-09-13

申请号：EP23186418.2

申请日：2012-02-14

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

发明人： Ravelli, Emmanuel ,  Geiger, Ralf ,  Schnell, Markus ,  Fuchs, Guillaume ,  Ruoppila, Vesa ,  Bäckström, Tom ,  Grill, Bernhard ,  Helmrich, Christian

IPC分类号： G10L19/02

摘要： An apparatus for encoding an audio signal having a stream of audio samples 100 comprises: a windower 102 for applying a prediction coding analysis window 200 to the stream of audio samples to obtain windowed data for a prediction analysis and for applying a transform coding analysis window 204 to the stream of audio samples to obtain windowed data for a transform analysis, wherein the transform coding analysis window is associated with audio samples within a current frame of audio samples and with audio samples of a predefined portion of a future frame of audio samples being a transform-coding look-ahead portion 206, wherein the prediction coding analysis window is associated with at least the portion of the audio samples of the current frame and with audio samples of a predefined portion of the future frame being a prediction coding look-ahead portion 208, wherein the transform coding look-ahead portion 206 and the prediction coding look-ahead portion 208 are identically to each other or are different from each other by less than 20% of the prediction coding look-ahead portion 208 or less than 20% of the transform coding look-ahead portion 206; and an encoding processor 104 for generating prediction coded data for the current frame using the windowed data for the prediction analysis or for generating transform coded data for the current frame using the windowed data for the transform analysis.

公开(公告)号：EP3471092B1

公开(公告)日：2020-07-08

申请号：EP18209670.1

申请日：2012-02-10

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

发明人： Bäckström, Tom ,  Fuchs, Guillaume

IPC分类号： G10L19/012 ,  G10L19/03 ,  G10L21/0216 ,  G10L25/78 ,  G10L19/22 ,  G10L19/02 ,  G10L19/025 ,  G10L19/107 ,  G10L19/04 ,  G10L19/26 ,  G10L25/06

公开(公告)号：EP3573056A1

公开(公告)日：2019-11-27

申请号：EP19160283.8

申请日：2009-05-18

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

发明人： Multrus, Markus ,  Grill, Bernhard ,  Fuchs, Guillaume ,  Geyersberger, Stefan ,  Rettelbach, Nikolaus ,  Bacigalupo, Virgilio

IPC分类号： G10L19/02 ,  G10L21/02 ,  H03M7/30

摘要： An audio encoder (100) for encoding segments of coefficients, the segments of coefficients representing different time or frequency resolutions of a sampled audio signal, the audio encoder (100) comprising a processor (110) for deriving a coding context for a currently encoded coefficient of a current segment based on a previously encoded coefficient of a previous segment, the previously encoded coefficient representing a different time or frequency resolution than the currently encoded coefficient. The audio encoder (100) further comprises an entropy encoder (120) for entropy encoding the current coefficient based on the coding context to obtain an encoded audio stream.

公开(公告)号：EP3503098A1

公开(公告)日：2019-06-26

申请号：EP19157006.8

申请日：2012-02-14

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

发明人： Ravelli, Emmanuel ,  Geiger, Ralf ,  Schnell, Markus ,  Fuchs, Guillaume ,  Ruoppila, Vesa ,  Bäckström, Tom ,  Grill, Bernhard ,  Helmrich, Christian

IPC分类号： G10L19/022 ,  G10L19/18

摘要： An audio decoder for decoding an encoded audio signal, comprises: a prediction parameter decoder (180) for performing a decoding of data for a prediction coded frame from the encoded audio signal; a transform parameter decoder (183) for performing a decoding of data for a transform coded frame from the encoded audio signal, wherein the transform parameter decoder (183) is configured for performing a spectral-time transform and for applying a synthesis window to transformed data to obtain data for the current frame and a future frame, the synthesis window having a first overlap portion, an adjacent second overlap portion and an adjacent third overlap portion (206), the third overlap portion being associated with audio samples for the future frame and the non-overlap portion (208) being associated with data of the current frame; and an overlap-adder (184) for overlapping and adding synthesis windowed samples associated with the third overlap portion of a synthesis window for the current frame and synthesis windowed samples associated with the first overlap portion of a synthesis window for the future frame to obtain a first portion of audio samples for the future frame, wherein a rest of the audio samples for the future frame are synthesis windowed samples associated with the second non-overlapping portion of the synthesis window for the future frame obtained without overlap-adding, when the current frame and the future frame comprise transform-coded data.

公开(公告)号：EP3067887A1

公开(公告)日：2016-09-14

申请号：EP15172599.1

申请日：2015-06-17

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

发明人： Disch, Sascha ,  Fuchs, Guillaume ,  Ravelli, Emmanuel ,  Neukam, Christian ,  Schmidt, Konstantin ,  Benndorf, Conrad ,  Niedermeier, Andreas ,  Schubert, Benjamin ,  Geiger, Ralf

IPC分类号： G10L19/008 ,  G10L19/04 ,  G10L19/02 ,  G10L21/038 ,  G10L19/18

CPC分类号： G10L19/008 ,  G10L19/02 ,  G10L19/032 ,  G10L19/04 ,  G10L19/13 ,  G10L19/18 ,  G10L21/038

摘要： Audio encoder 2" for encoding a multichannel signal 4 is shown. The audio encoder comprises a downmixer 12 for downmixing the multichannel signal 4 to obtain a downmix signal 14, a linear prediction domain core encoder 16 for encoding the downmix signal 14, wherein the downmix signal 14 has a low band and a high band, wherein the linear prediction domain core encoder 16 is configured to apply a bandwidth extension processing for parametrically encoding the high band, a filterbank 82 for generating a spectral representation of the multichannel signal 4, and a joint multichannel encoder 18 configured to process the spectral representation comprising the low band and the high band of the multichannel signal to generate multichannel information 20.

摘要翻译： 被示出音频编码器2“用于编码的多通道信号4，音频编码器包括下混频器12，用于降混多声道信号4以获得降混信号14，用于编码所述降混信号14的线性预测域核心编码器16，worin缩混 信号14具有低频带和高频带，worin线性预测域核心编码器16被配置为应用带宽扩展处理以参数编码所述高频带，用于产生多声道信号4的频谱表示的滤波器组82和 联合多声道编码器18被配置为处理所述频谱表示包括低带和所述多信道信号的高频带，以产生多声道信息第二十

公开(公告)号：EP2980791A1

公开(公告)日：2016-02-03

申请号：EP14178774.7

申请日：2014-07-28

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

CPC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).

摘要翻译： 一种用于音频信号（200）的处理的处理器包括：（在分析仪（202），用于从指示来自第一非对称窗口（1400）到第二窗口的改变所述音频信号（200）导出的窗口控制信号（204） 1402），或指示从第三窗口（1450）的第四非对称窗口（1452）的变化，worin第二窗口（1402）比第一窗口（1400）更短，或worin第三窗口（1450）是短 比第四窗口（1452）; 一个窗口构造（206），用于使用所述第一非对称窗口（1400）的第一重叠部分（800）构造第二窗口（1402），worin窗口构造（206）被配置为确定矿的第一重叠部分（1000） 使用所述第一非对称窗口的截短第一重叠部分中的第二窗口（1402），或worin窗口构造函数被配置以计算使用截短的第二重叠部分中的第三个窗口（1450）的第二重叠部分（1330）（814） 第四非对称窗口（1452）的; 和用于施加所述第一和第二窗口或所述第三和第四窗口，以获得加窗后音频信号的部分（210）一个加窗器（208）。

公开(公告)号：EP2945159A1

公开(公告)日：2015-11-18

申请号：EP15167199.7

申请日：2009-12-11

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

发明人： Nagel, Frederik ,  Fuchs, Guillaume ,  Disch, Sascha ,  Herre, Jürgen ,  Griebel, Christian

IPC分类号： G10L21/038 ,  G10L19/00 ,  G10L19/24

CPC分类号： G10L19/265 ,  G10L19/00 ,  G10L19/24 ,  G10L21/038

摘要： An audio encoder for providing an output signal using an input audio signal comprises a patch generator, a comparator and an output interface. The patch generator generates at least one bandwidth extension high-frequency signal, wherein a bandwidth extension high-frequency signal comprises a high-frequency band. The high-frequency band of the bandwidth extension high-frequency signal is based on a low frequency band of the input audio signal. A comparator calculates a plurality of comparison parameters. A comparison parameter is calculated based on a comparison of the input audio signal and a generated bandwidth extension high-frequency signal. Each comparison parameter of the plurality of comparison parameters is calculated based on a different offset frequency between the input audio signal and a generated bandwidth extension high-frequency signal. Further, the comparator determines a comparison parameter from the plurality of comparison parameters, wherein the determined comparison parameter fulfills a predefined criterion.

摘要翻译： 用于使用输入音频信号提供输出信号的音频编码器包括片生成器，比较器和输出接口。 贴片发生器产生至少一个带宽扩展高频信号，其中带宽扩展高频信号包括高频带。 带宽扩展高频信号的高频带基于输入音频信号的低频带。 比较器计算多个比较参数。 基于输入音频信号和产生的带宽扩展高频信号的比较来计算比较参数。 基于输入音频信号和生成的带宽扩展高频信号之间的不同偏移频率来计算多个比较参数的每个比较参数。 此外，比较器确定来自多个比较参数的比较参数，其中确定的比较参数满足预定标准。

公开(公告)号：EP2346029B1

公开(公告)日：2013-06-05

申请号：EP11157188.1

申请日：2009-06-25

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

发明人： Rettelbach, Nikolaus ,  Grill, Bernhard ,  Fuchs, Guillaume ,  Geyersberger, Stefan ,  Multrus, Markus ,  Popp, Harald ,  Herre, Jürgen ,  Wabnik, Stefan ,  Schuller, Gerald ,  Hirschfeld, Jens

IPC分类号： G10L19/00 ,  G10L19/02

CPC分类号： G10L19/0017 ,  G10L19/02 ,  G10L19/0204 ,  G10L19/022 ,  G10L19/028 ,  G10L19/035 ,  G10L25/18

公开(公告)号：EP2146344A1

公开(公告)日：2010-01-20

申请号：EP09002270.8

申请日：2009-02-18

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

发明人： Grill, Bernhard ,  Bayer, Stefan ,  Fuchs, Guillaume ,  Geyersberger, Stefan ,  Geiger, Ralf ,  Hilpert, Johannes ,  Krämer, Ulrich ,  Lecomte, Jeremie ,  Multrus, Markus ,  Neuendorf, Max ,  Popp, Harald ,  Rettelbach, Nikolaus ,  Lefebvre, Roch ,  Bessette, Bruno ,  Lapierre, Jimmy ,  Gournay, Philippe ,  Salami, Redwan

IPC分类号： G10L19/14

CPC分类号： G10L19/173 ,  G10L19/0017 ,  G10L19/008 ,  G10L19/0212 ,  G10L19/18 ,  G10L2019/0008

摘要： An apparatus for encoding comprises a first domain converter (510), a switchable bypass (50), a second domain converter (410), a first processor (420) and a second processor (520) to obtain an encoded audio signal having different signal portions represented by coded data in different domains, which have been coded by different coding algorithms. Corresponding decoding stages in the decoder together with a bypass for bypassing a domain converter allow the generation of a decoded audio signal with high quality and low bit rate.

摘要翻译： 一种用于编码的装置，包括第一域转换器（510），可切换旁路（50），第二域转换器（410），第一处理器（420）和第二处理器（520），以获得具有不同信号的编码音频信号 由不同域中的编码数据表示的部分，其已经由不同的编码算法编码。 解码器中的对应的解码级以及用于绕过域转换器的旁路允许生成具有高质量和低比特率的解码音频信号。