公开(公告)号：US11996106B2

公开(公告)日：2024-05-28

申请号：US17339270

申请日：2021-06-04

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

发明人： Sascha Disch ,  Frederik Nagel ,  Ralf Geiger ,  Balaji Nagendran Thoshkahna ,  Konstantin Schmidt ,  Stefan Bayer ,  Christian Neukam ,  Bernd Edler ,  Christian Helmrich

IPC分类号： G10L19/008 ,  G10L19/02 ,  G10L19/022 ,  G10L19/025 ,  G10L19/03 ,  G10L19/032 ,  G10L19/06 ,  G10L21/0388 ,  G10L25/06 ,  G10L25/18 ,  G10L25/21 ,  H04S1/00

CPC分类号： G10L19/008 ,  G10L19/0204 ,  G10L19/0208 ,  G10L19/0212 ,  G10L19/022 ,  G10L19/025 ,  G10L19/03 ,  G10L19/032 ,  G10L19/06 ,  G10L21/0388 ,  G10L25/06 ,  G10L25/18 ,  G10L25/21 ,  H04S1/007 ,  G10L19/02

摘要： An apparatus decodes an encoded audio signal. The apparatus includes a spectral domain audio decoder that generates a decoded representation of a set of spectral portions, the decoded representation being spectral prediction residual values. A frequency regenerator generates a reconstructed spectral portion using a portion of the same set spectral portions. The reconstructed spectral portion also includes spectral prediction residual values. An inverse prediction filter is configured using prediction filter information included in the encoded audio signal and performs an inverse prediction over frequency using the spectral prediction residual values.

公开(公告)号：US11887609B2

公开(公告)日：2024-01-30

申请号：US17751303

申请日：2022-05-23

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

发明人： Stefan Bayer ,  Eleni Fotopoulou ,  Markus Multrus ,  Guillaume Fuchs ,  Emmanuel Ravelli ,  Markus Schnell ,  Stefan Doehla ,  Wolfgang Jaegers ,  Martin Dietz ,  Goran Markovic

IPC分类号： G10L19/008 ,  G10L19/022 ,  G10L19/02 ,  G10L19/04 ,  G10L25/18 ,  H04S3/00

CPC分类号： G10L19/008 ,  G10L19/02 ,  G10L19/022 ,  G10L19/04 ,  G10L25/18 ,  H04S3/008 ,  H04S2400/01 ,  H04S2400/03 ,  H04S2420/03

摘要： An apparatus for estimating an inter-channel time difference between a first channel signal and a second channel signal, includes: a calculator for calculating a cross-correlation spectrum for a time block from the first channel signal in the time block and the second channel signal in the time block; a spectral characteristic estimator for estimating a characteristic of a spectrum of the first channel signal or the second channel signal for the time block; a smoothing filter for smoothing the cross-correlation spectrum over time using the spectral characteristic to obtain a smoothed cross-correlation spectrum; and a processor for processing the smoothed cross-correlation spectrum to obtain the inter-channel time difference.

公开(公告)号：US11842742B2

公开(公告)日：2023-12-12

申请号：US16041691

申请日：2018-07-20

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

发明人： Emmanuel Ravelli ,  Markus Schnell ,  Stefan Doehla ,  Wolfgang Jaegers ,  Martin Dietz ,  Christian Helmrich ,  Goran Markovic ,  Eleni Fotopoulou ,  Markus Multrus ,  Stefan Bayer ,  Guillaume Fuchs ,  Juergen Herre

IPC分类号： G10L19/008 ,  G10L19/03 ,  G10L19/032 ,  G10L19/02 ,  G10L19/22

CPC分类号： G10L19/008 ,  G10L19/03 ,  G10L19/032 ,  G10L19/0204 ,  G10L19/0212 ,  G10L19/22

摘要： An apparatus for encoding a first channel and a second channel of an audio input signal including two or more channels to obtain an encoded audio signal according to an embodiment includes a normalizer configured to determine a normalization value for the audio input signal depending on the first channel of the audio input signal and depending on the second channel of the audio input signal. Moreover, the apparatus includes an encoding unit configured to generate a processed audio signal having a first channel and a second channel. The encoding unit is configured to encode the processed audio signal to obtain the encoded audio signal.

公开(公告)号：US11049506B2

公开(公告)日：2021-06-29

申请号：US16417471

申请日：2019-05-20

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

发明人： Sascha Disch ,  Frederik Nagel ,  Ralf Geiger ,  Balaji Nagendran Thoshkahna ,  Konstantin Schmidt ,  Stefan Bayer ,  Christian Neukam ,  Bernd Edler ,  Christian Helmrich

IPC分类号： G10L19/008 ,  G10L21/0388 ,  G10L19/025 ,  G10L19/03 ,  G10L19/02 ,  G10L19/022 ,  G10L19/032 ,  G10L19/06 ,  G10L25/06 ,  H04S1/00

摘要： An apparatus for decoding an encoded audio signal, includes: a spectral domain audio decoder for generating a first decoded representation of a first set of first spectral portions being spectral prediction residual values; a frequency regenerator for generating a reconstructed second spectral portion using a first spectral portion of the first set of first spectral portions, wherein the reconstructed second spectral portion additionally includes spectral prediction residual values; and an inverse prediction filter for performing an inverse prediction over frequency using the spectral residual values for the first set of first spectral portions and the reconstructed second spectral portion using prediction filter information included in the encoded audio signal.

公开(公告)号：US10573334B2

公开(公告)日：2020-02-25

申请号：US15002370

申请日：2016-01-20

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

发明人： Sascha Disch ,  Frederik Nagel ,  Ralf Geiger ,  Balaji Nagendran Thoshkahna ,  Konstantin Schmidt ,  Stefan Bayer ,  Christian Neukam ,  Bernd Edler ,  Christian Helmrich

IPC分类号： G10L19/00 ,  G10L21/0388 ,  G10L19/008 ,  G10L19/025 ,  G10L19/03 ,  G10L19/02 ,  G10L19/022 ,  G10L19/032 ,  G10L19/06 ,  G10L25/06 ,  H04S1/00

摘要： An apparatus for decoding an encoded audio signal, includes a spectral domain audio decoder for generating a first decoded representation of a first set of first spectral portions, the decoded representation having a first spectral resolution; a parametric decoder for generating a second decoded representation of a second set of second spectral portions having a second spectral resolution being lower than the first spectral resolution; a frequency regenerator for regenerating every constructed second spectral portion having the first spectral resolution using a first spectral portion and spectral envelope information for the second spectral portion; and a spectrum time converter for converting the first decoded representation and the reconstructed second spectral portion into a time representation.

公开(公告)号：US09646632B2

公开(公告)日：2017-05-09

申请号：US14538756

申请日：2014-11-11

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

发明人： Stefan Bayer ,  Sascha Disch ,  Ralf Geiger ,  Guillaume Fuchs ,  Max Neuendorf ,  Gerald Schuller ,  Bernd Edler

IPC分类号： G10L19/00 ,  G10L21/04 ,  G10L19/002 ,  G10L19/028 ,  G10L19/022 ,  G10L19/032 ,  G10L21/043 ,  G10L25/90 ,  G10L19/26

CPC分类号： G10L21/04 ,  G10L19/002 ,  G10L19/0212 ,  G10L19/022 ,  G10L19/028 ,  G10L19/032 ,  G10L19/265 ,  G10L21/043 ,  G10L25/90

摘要： An audio encoder has a window function controller, a windower, a time warper with a final quality check functionality, a time/frequency converter, a TNS stage or a quantizer encoder, the window function controller, the time warper, the TNS stage or an additional noise filling analyzer are controlled by signal analysis results obtained by a time warp analyzer or a signal classifier. Furthermore, a decoder applies a noise filling operation using a manipulated noise filling estimate depending on a harmonic or speech characteristic of the audio signal.

公开(公告)号：US09293149B2

公开(公告)日：2016-03-22

申请号：US14538748

申请日：2014-11-11

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

发明人： Stefan Bayer ,  Sascha Disch ,  Ralf Geiger ,  Guillaume Fuchs ,  Max Neuendorf ,  Gerald Schuller ,  Bernd Edler

IPC分类号： G10L15/00 ,  G10L21/00 ,  G10L21/02 ,  G10L21/04 ,  G10L19/002 ,  G10L19/028 ,  G10L19/022 ,  G10L19/032 ,  G10L21/043 ,  G10L25/90 ,  G10L19/26

CPC分类号： G10L21/04 ,  G10L19/002 ,  G10L19/0212 ,  G10L19/022 ,  G10L19/028 ,  G10L19/032 ,  G10L19/265 ,  G10L21/043 ,  G10L25/90

摘要： An audio encoder has a window function controller, a windower, a time warper with a final quality check functionality, a time/frequency converter, a TNS stage or a quantizer encoder, the window function controller, the time warper, the TNS stage or an additional noise filling analyzer are controlled by signal analysis results obtained by a time warp analyzer or a signal classifier. Furthermore, a decoder applies a noise filling operation using a manipulated noise filling estimate depending on a harmonic or speech characteristic of the audio signal.

公开(公告)号：US09257130B2

公开(公告)日：2016-02-09

申请号：US13736762

申请日：2013-01-08

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

发明人： Jeremie Lecomte ,  Patrick Warmbold ,  Stefan Bayer

IPC分类号： G10L19/04 ,  G10L19/005 ,  G10L19/20 ,  G10L19/02

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

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 have, and thus reading forward aliasing cancellation data from the current frame and a second action of not-expecting the current frame to have, 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.

摘要翻译： 支持在时域混叠取消变换编码模式和时域编码模式之间进行切换的编解码器通过向帧中添加另外的语法部分而不易造成帧丢失，这取决于解码器的解析器可以在第一动作 期望当前帧具有并且因此从当前帧中转发混叠取消数据，以及不期望当前帧具有并且因此不从当前帧读取前向混叠取消数据的第二动作。 换句话说，由于提供新的语法部分而导致编码效率的一部分丢失，仅仅是在具有帧丢失的通信信道的情况下提供使用编解码器的能力的新语法部分。 没有新的语法部分，解码器将不能在丢失之后解码任何数据流部分，并且在尝试恢复解析时将崩溃。 因此，在容易出错的环境中，通过引入新的语法部分，防止了编码效率的消失。

公开(公告)号：US11735192B2

公开(公告)日：2023-08-22

申请号：US17576780

申请日：2022-01-14

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

发明人： Sascha Disch ,  Frederik Nagel ,  Ralf Geiger ,  Balaji Nagendran Thoshkahna ,  Konstantin Schmidt ,  Stefan Bayer ,  Christian Neukam ,  Bernd Edler ,  Christian Helmrich

IPC分类号： G10L19/00 ,  G10L19/008 ,  G10L25/18 ,  G10L25/21 ,  G10L21/0388 ,  G10L19/025 ,  G10L19/03 ,  G10L19/02 ,  G10L19/022 ,  G10L19/032 ,  G10L19/06 ,  G10L25/06 ,  H04S1/00

CPC分类号： G10L19/008 ,  G10L19/022 ,  G10L19/0204 ,  G10L19/025 ,  G10L19/0208 ,  G10L19/0212 ,  G10L19/03 ,  G10L19/032 ,  G10L19/06 ,  G10L21/0388 ,  G10L25/06 ,  G10L25/18 ,  G10L25/21 ,  H04S1/007 ,  G10L19/02

摘要： An apparatus for generating a decoded two-channel signal, comprising: a parametric decoder for providing parametric data for a second set of second spectral portions and a two-channel identification identifying for a second spectral portion of the second set of second spectral portions either a first two-channel representation for the second spectral portion of the second set of second spectral portions or a second two-channel representation for the second spectral portion of the second set of second spectral portions, the second two-channel representation being different from the first two-channel representation; and a frequency regenerator for regenerating the second spectral portion of the second set of second spectral portions depending on a first spectral portion of a first set of first spectral portions, the parametric data for the second spectral portion of the second set of second spectral portions and the two-channel identification for the second spectral portion of the second set of second spectral portions to acquire a regenerated second spectral portion of the second set of second spectral portions.

公开(公告)号：US11682404B2

公开(公告)日：2023-06-20

申请号：US17933583

申请日：2022-09-20

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

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

IPC分类号： G10L19/18 ,  G10L19/008 ,  G10L19/16 ,  G10L19/00 ,  G10L19/02

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

摘要： An audio encoder has a first information sink oriented encoding branch such as a spectral domain encoding branch, a second information source or SNR oriented encoding branch such as an LPC-domain encoding branch, and a switch for switching between the first and second encoding branches, the second encoding branch having a converter into a specific domain different from the spectral domain such as an LPC analysis stage generating an excitation signal, and the second encoding branch having a specific domain coding branch such as LPC domain processing branch, and a specific spectral domain coding branch such as LPC spectral domain processing branch, and an additional switch for switching between the specific domain coding branch and the specific spectral domain coding branch. An audio decoder has a first domain decoder, a second domain decoder, and a third domain decoder as well as two cascaded switches for switching between the decoders.