公开(公告)号：EP4439559A2

公开(公告)日：2024-10-02

申请号：EP24194544.3

申请日：2015-07-24

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

发明人： DISCH, Sascha ,  GEIGER, Ralf ,  NIEDERMEIER, Andreas ,  NEUSINGER, Matthias ,  SCHMIDT, Konstantin ,  WILDE, Stephan ,  SCHUBERT, Benjamin ,  NEUKAM, Christian

IPC分类号： G10L21/038

CPC分类号： G10L21/038 ,  G10L19/028

摘要： An apparatus for generating an enhanced signal from an input signal (600), wherein the enhanced signal has spectral values for an enhancement spectral region, the spectral values for the enhancement spectral regions not being contained in the input signal (600), comprises a mapper (602) for mapping a source spectral region of the input signal to a target region in the enhancement spectral region, the source spectral region comprising a noise-filling region (302); and a noise filler (604) configured for generating first noise values for the noise-filling region (302) in the source spectral region of the input signal and for generating second noise values for a noise region in the target region, wherein the second noise values are decorrelated from the first noise values or for generating second noise values for a noise region in the target region, wherein the second noise values are decorrelated from first noise values in the source region.

公开(公告)号：EP3483879A1

公开(公告)日：2019-05-15

申请号：EP17201086.0

申请日：2017-11-10

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

发明人： SCHNELL, Markus ,  LUTZKY, Manfred ,  TSCHEKALINSKIJ, Alexander ,  GEIGER, Ralf

IPC分类号： G10L19/022 ,  G10L19/02 ,  H04N19/60 ,  G06F17/14 ,  G06T9/00 ,  G10L25/45

摘要： There are provided methods and apparatus for performing modified cosine transformation (MDCT) with an analysis/synthesis windowing function, using an analysis windowing function (40, 50, 60, 70, 90) having a meandering portion (44, 64, 94) which passes a linear function (40', 60') in correspondence of at least four points (#1, #2, #3, #4).

公开(公告)号：EP3261088A1

公开(公告)日：2017-12-27

申请号：EP17174051.7

申请日：2010-01-28

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

发明人： NEUENDORF, Max ,  LECOMTE, Jérémie ,  MULTRUS, Markus ,  BAYER, Stefan ,  NAGEL, Frederik ,  FUCHS, Guillaume ,  ROBILLIARD, Julien ,  RETTELBACH, Nikolaus ,  GEIGER, Ralf ,  GRILL, Bernhard

IPC分类号： G10L19/022 ,  G10L19/20

CPC分类号： G10L19/022 ,  G10L19/20

摘要： An audio decoder for providing a decoded representation of an audio content on the basis of an encoded representation of the audio content comprises a linear-prediction-domain decoder core configured to provide a time-domain representation of an audio frame on the basis of a set of linear-prediction domain parameters associated with the audio frame and a frequency-domain decoder core configured to provide a time-domain representation of an audio frame on the basis of a set of frequency-domain parameters, taking into account a transform window out of a set comprising a plurality of different transform windows. The audio decoder comprises a signal combiner configured to overlap-and-add-time-domain representations of subsequent audio frames encoded in different domains, in order to smoothen a transition between the time-domain representations of the subsequent frames. The set of transform windows comprises one or more windows specifically adapted for a transition between a frequency-domain core mode and a linear-prediction-domain core mode.

摘要翻译： 用于基于音频内容的编码表示来提供音频内容的解码表示的音频解码器包括线性预测域解码器核心，该线性预测域解码器核心被配置为基于集合提供音频帧的时域表示 与音频帧相关联的线性预测域参数和配置成基于一组频域参数提供音频帧的时域表示的频域解码器核心，考虑到变换窗口 包括多个不同变换窗口的集合。 音频解码器包括信号组合器，该信号组合器被配置为在不同域中编码的后续音频帧的重叠和添加时域表示，以平滑后续帧的时域表示之间的转换。 该组变换窗口包括专门适用于频域核心模式和线性预测域核心模式之间的转换的一个或多个窗口。

公开(公告)号：EP3175449A1

公开(公告)日：2017-06-07

申请号：EP15741557.1

申请日：2015-07-24

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

发明人： DISCH, Sascha ,  GEIGER, Ralf ,  NIEDERMEIER, Andreas ,  NEUSINGER, Matthias ,  SCHMIDT, Konstantin ,  WILDE, Stephan ,  SCHUBERT, Benjamin ,  NEUKAM, Christian

IPC分类号： G10L19/028 ,  G10L21/038

CPC分类号： G10L19/028 ,  G10L19/0204 ,  G10L21/038 ,  G10L25/21

摘要： An apparatus for generating an enhanced signal from an input signal (600), wherein the enhanced signal has spectral values for an enhancement spectral region, the spectral values for the enhancement spectral regions not being contained in the input signal (600), comprises a mapper (602) for mapping a source spectral region of the input signal to a target region in the enhancement spectral region, the source spectral region comprising a noise-filling region (302); and a noise filler (604) configured for generating first noise values for the noise-filling region (302) in the source spectral region of the input signal and for generating second noise values for a noise region in the target region, wherein the second noise values are decorrelated from the first noise values or for generating second noise values for a noise region in the target region, wherein the second noise values are decorrelated from first noise values in the source region.

摘要翻译： 在增强的信号从在worin增强的信号输入信号（600）产生一个设备具有增强的光谱区域用于频谱值，不被包含在输入信号（600）增强的频谱区的频谱值包括映射器 （602），用于在增强频谱区域中的输入信号的源光谱区域映射到目标区，在源光谱区域包括噪声填充区域（302）; 并且被配置为产生用于在所述输入信号的源光谱区域的噪声填充区域（302）的第一噪声值，并用于在所述目标区域中的噪声区域中产生第二噪声值，worin第二噪声的噪声填充（604） 值从第一噪声值或用于在所述目标区域中的噪声区域产生第二噪声值，worin第二噪声值从在所述源极区的第一噪声值被去相关去相关。

公开(公告)号：EP3036738A1

公开(公告)日：2016-06-29

申请号：EP14758321.5

申请日：2014-08-22

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

发明人： DISCH, Sascha ,  NAGEL, Frederik ,  GEIGER, Ralf ,  NEUKAM, Christian ,  EDLER, Bernd

IPC分类号： G10L19/02 ,  G10L19/028 ,  G10L21/038

CPC分类号： G10L19/022 ,  G06F17/147 ,  G10L19/0212 ,  G10L19/028 ,  G10L19/032 ,  G10L21/038

摘要： An apparatus for processing an audio signal including a sequence of blocks of spectral values, includes: a processor for calculating an aliasing-affected signal using at least one first modification value for a first block of the sequence of blocks and using at least one different second modification value for a second block of the sequence of blocks and for estimating an aliasing-error signal representing an aliasing-error in the aliasing-affected signal; and a combiner for combining the aliasing-affected signal and the aliasing-error signal such that a processed signal obtained by the combining is an aliasing-reduced or aliasing-free signal.

摘要翻译： 用于音频信号包括频谱值的块的序列的处理的设备，包括：用于使用至少一个第一修正值用于块的序列的第一块在混叠影响的信号计算和使用至少一个不同的第二处理器 为块的序列的第二块和混叠误差信号在混叠混叠影响的信号误差较估计修正值; 和混叠影响的信号组合的组合器和混叠误差信号搜索没有由合成得到的处理信号是混叠减小的或无混叠信号。

公开(公告)号：EP3025337A1

公开(公告)日：2016-06-01

申请号：EP14738853.2

申请日：2014-07-15

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

发明人： DISCH, Sascha ,  NAGEL, Frederik ,  GEIGER, Ralf ,  THOSHKAHNA, Balaji Nagendran ,  SCHMIDT, Konstantin ,  BAYER, Stefan ,  NEUKAM, Christian ,  EDLER, Bernd ,  HELMRICH, Christian

IPC分类号： G10L19/02 ,  G10L21/038

CPC分类号： G10L19/008 ,  G10L19/02 ,  G10L19/0204 ,  G10L19/0208 ,  G10L19/0212 ,  G10L19/022 ,  G10L19/025 ,  G10L19/03 ,  G10L19/032 ,  G10L19/06 ,  G10L21/0388 ,  G10L25/06 ,  H04S1/007

摘要： Apparatus for decoding an encoded audio signal comprising an encoded core signal (1), comprising: a core decoder (1400) for decoding the encoded core signal (1401) to obtain a decoded core signal; a tile generator (1404) for generating one or more spectral tiles having frequencies not included in the decoded core signal using a spectral portion of the decoded core signal; and a cross-over filter (1406) for spectrally cross-over filtering the decoded core signal and a first frequency tile having frequencies extending from a gap filling frequency (309) to an upper border frequency or for spectrally cross-over filtering a first frequency tile and a second frequency tile.

公开(公告)号：EP2550653B1

公开(公告)日：2014-04-02

申请号：EP12705255.3

申请日：2012-02-14

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

发明人： SCHNELL, Markus ,  GEIGER, Ralf ,  RAVELLI, Emmanuel ,  FOTOPOULOU, Eleni

IPC分类号： G10L19/012

CPC分类号： G10L19/00 ,  G10K11/16 ,  G10L19/005 ,  G10L19/012 ,  G10L19/0212 ,  G10L19/025 ,  G10L19/03 ,  G10L19/04 ,  G10L19/107 ,  G10L19/12 ,  G10L19/22 ,  G10L19/26 ,  G10L21/0216 ,  G10L25/06 ,  G10L25/78

公开(公告)号：EP2491555A1

公开(公告)日：2012-08-29

申请号：EP10766284.3

申请日：2010-10-19

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

发明人： GEIGER, Ralf ,  FUCHS, Guillaume ,  MULTRUS, Markus ,  GRILL, Bernhard

IPC分类号： G10L19/14 ,  G10L19/08

CPC分类号： G10L19/12 ,  G10L19/03 ,  G10L19/04 ,  G10L19/083 ,  G10L19/20 ,  G10L2019/0002

摘要： In an embodiment, bitstream elements of sub-frames are encoded differentially to a global gain value so that a change of the global gain value results in an adjustment of an output level of the decoded representation of the audio content. Concurrently, the differential coding saves bits. Even further, the differential coding enables the lowering of the burden of globally adjusting the gain of an encoded bitstream. In another embodiment, a global gain control across CELP coded frames and transform coded frames is achieved by co-controlling the gain of the codebook excitation of the CELP codec, along with a level of the transform or inverse transform of the transform coded frames. In another embodiment, the gain value determination in CELP coding is performed in the weighted domain of the excitation signal.

公开(公告)号：EP2301024B1

公开(公告)日：2012-07-25

申请号：EP09797423.2

申请日：2009-07-06

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 ,  KRAEMER, Ulrich ,  LECOMTE, Jeremie ,  MULTRUS, Markus ,  NEUENDORF, Max ,  POPP, Harald ,  RETTELBACH, Nikolaus ,  LEFEBVRE, Roch ,  BESSETTE, Bruno ,  LAPIERRE, Jimmy ,  SALAMI, Redwan ,  GOURNAY, Philippe

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.

公开(公告)号：EP2311035B1

公开(公告)日：2012-01-04

申请号：EP09793882.3

申请日：2009-07-06

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

发明人： GRILL, Bernhard ,  BAYER, Stefan ,  FUCHS, Guillaume ,  GEYERSBERGER, Stefan ,  GEIGER, Ralf ,  HILPERT, Johannes ,  KRAEMER, Ulrich ,  LECOMTE, Jeremie ,  MULTRUS, Markus ,  NEUENDORF, Max ,  POPP, Harald ,  RETTELBACH, Nikolaus ,  NAGEL, Frederik ,  DISCH, Sascha ,  HERRE, Juergen ,  YOKOTANI, Yoshikazu ,  WABNIK, Stefan ,  SCHULLER, Gerald ,  HIRSCHFELD, Jens

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 audio encoder comprises a common preprocessing stage, an information sink based encoding branch such as spectral domain encoding branch, a information source based encoding branch such as an LPC-domain encoding branch and a switch for switching between these branches at inputs into these branches or outputs of these branches controlled by a decision stage. An audio decoder comprises a spectral domain decoding branch, an LPC-domain decoding branch, one or more switches for switching between the branches and a common post-processing stage for post-processing a time-domain audio signal for obtaining a post-processed audio signal.