公开(公告)号：EP2301023B1

公开(公告)日：2016-03-23

申请号：EP09793874.0

申请日：2009-06-26

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

发明人： GRILL, Bernhard ,  LEFEBVRE, Roch ,  BESSETTE, Bruno ,  LAPIERRE, Jimmy ,  GOURNAY, Philippe ,  SALAMI, Redwan ,  BAYER, Stefan ,  FUCHS, Guillaume ,  GEYERSBERGER, Stefan ,  GEIGER, Ralf ,  HILPERT, Johannes ,  KRAEMER, Ulrich ,  LECOMTE, Jeremie ,  MULTRUS, Markus ,  NEUENDORF, Max ,  POPP, Harald ,  RETTELBACH, Nikolaus

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

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

摘要： An audio encoder comprises 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 encoding branch and the second encoding branch, wherein the second encoding branch comprises a converter into a specific domain different from the spectral domain such as an LPC analysis stage generating an excitation signal, and wherein the second encoding branch furthermore comprises 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 comprises a first domain decoder such as a spectral domain decoding branch, a second domain decoder such as an LPC domain decoding branch for decoding a signal such as an excitation signal in the second domain, and a third domain decoder such as an LPC-spectral decoder branch and two cascaded switches for switching between the decoders.

公开(公告)号：EP4358082A1

公开(公告)日：2024-04-24

申请号：EP24160714.2

申请日：2010-10-19

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. ,  VoiceAge Corporation ,  Koninklijke Philips N.V. ,  Dolby International AB

发明人： BESSETTE, Bruno ,  NEUENDORF, Max ,  GEIGER, Ralf ,  GOURNAY, Philippe ,  LEFEBVRE, Roch ,  GRILL, Bernhard ,  LECOMTE, Jérémie ,  BAYER, Stefan ,  RETTELBACH, Nikolaus ,  VILLEMOES, Lars ,  SALAMI, Redwan ,  DEN BRINKER, Albertus C.

IPC分类号： G10L19/18 ,  G10L19/02 ,  G10L19/04 ,  G10L19/03 ,  G10L19/12 ,  G10L19/20

CPC分类号： G10L19/0212 ,  G10L19/03 ,  G10L19/20 ,  G10L19/18 ,  G10L19/04 ,  G10L19/12

摘要： An audio signal decoder (200) for providing a decoded representation (212) of an audio content on the basis of an encoded representation (310) of the audio content comprises a transform domain path (230, 240, 242, 250, 260) configured to obtain a time-domain representation (212) of a portion of the audio content encoded in a transform-domain mode on the basis of a first set (220) of spectral coefficients, a representation (224) of an aliasing-cancellation stimulus signal and a plurality of linear-prediction-domain parameters (222). The transform domain path comprises a spectrum processor (230) configured to apply a spectrum shaping to the first set of spectral coefficients in dependence on at least a subset of the linear-prediction-domain parameters, to obtain a spectrally-shaped version (232) of the first set of spectral coefficients. The transform domain path comprises a first frequency-domain-to-time-domain converter (240) configured to obtain a time-domain representation of the audio content on the basis of the spectrally-shaped version of the first set of spectral coefficients. The transform domain path comprises an aliasing-cancellation stimulus filter configured to filter (250) the aliasing-cancellation stimulus signal (324) in dependence on at least a subset of the linear-prediction-domain parameters (222), to derive an aliasing-cancellation synthesis signal (252) from the aliasing-cancellation stimulus signal. The transform domain path also comprises a combiner (260) configured to combine the time-domain representation (242) of the audio content with the aliasing-cancellation synthesis signal (252), or a post-processed version thereof, to obtain an aliasing reduced time-domain signal.

公开(公告)号：EP2301023A1

公开(公告)日：2011-03-30

申请号：EP09793874.0

申请日：2009-06-26

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

发明人： GRILL, Bernhard ,  LEFEBVRE, Roch ,  BESSETTE, Bruno ,  LAPIERRE, Jimmy ,  GOURNAY, Philippe ,  SALAMI, Redwan ,  BAYER, Stefan ,  FUCHS, Guillaume ,  GEYERSBERGER, Stefan ,  GEIGER, Ralf ,  HILPERT, Johannes ,  KRAEMER, Ulrich ,  LECOMTE, Jeremie ,  MULTRUS, Markus ,  NEUENDORF, Max ,  POPP, Harald ,  RETTELBACH, Nikolaus

IPC分类号： G10L19/14

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

摘要： An audio encoder comprises 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 encoding branch and the second encoding branch, wherein the second encoding branch comprises a converter into a specific domain different from the spectral domain such as an LPC analysis stage generating an excitation signal, and wherein the second encoding branch furthermore comprises 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 comprises a first domain decoder such as a spectral domain decoding branch, a second domain decoder such as an LPC domain decoding branch for decoding a signal such as an excitation signal in the second domain, and a third domain decoder such as an LPC-spectral decoder branch and two cascaded switches for switching between the decoders.

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：EP2345030A2

公开(公告)日：2011-07-20

申请号：EP09736835.1

申请日：2009-10-07

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

发明人： NEUENDORF, Max ,  BAYER, Stefan ,  LECOMTE, Jérémie ,  FUCHS, Guillaume ,  ROBILLIARD, JuIien ,  RETTELBACH, Nikolaus ,  NAGEL, Frederik ,  GEIGER, RaIf ,  MULTRUS, Markus ,  GRILL, Bernhard ,  GOURNAY, Philippe ,  SALAMI, Redwan

IPC分类号： G10L19/14

CPC分类号： G10L19/24 ,  G10L19/022

摘要： An audio encoder for encoding an audio signal comprises a first coding branch (400), the first coding branch comprising a first converter (410) for converting a signal from a time domain into a frequency domain. Furthermore, the audio encoder comprises a second coding branch (500) comprising a second time/frequency converter (523). Additionally, a signal analyzer (300/525) for analyzing the audio signal is provided. The signal analyzer, on the hand, determines whether an audio portion is effective in the encoder output signal as a first encoded signal from the first encoding branch or as a second encoded signal from a second encoding branch. On the other hand, the signal analyzer determines a time/frequency resolution to be applied by the converters (410, 523) when generating the encoded signals. An output interface includes, in addition to the first encoded signal and the second encoded signal, a resolution information identifying the resolution used by the first time/frequency converter and used by the second time/frequency converter.

公开(公告)号：EP2311032A1

公开(公告)日：2011-04-20

申请号：EP09776858.4

申请日：2009-06-26

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

发明人： LECOMTE, Jérémie ,  GOURNAY, Philippe ,  BAYER, Stefan ,  MULTRUS, Markus ,  BESSETTE, Bruno ,  GRILL, Bernhard

IPC分类号： G10L19/02 ,  G10L19/14

CPC分类号： G10L19/20 ,  G10L19/022

摘要： An audio encoder for encoding audio samples has a first time domain aliasing introducing encoder configured to decode audio samples in a first encoding domain and having a first framing rule, a start window and a stop window. The audio encoder further has a second encoder configured to encode samples in a second encoding domain and having a predetermined frame size number of audio samples, and a coding warm-up period number of audio samples, the second encoder having a different second framing rule, a frame of the second encoder being an encoded representation of a number of successive audio samples that is equal to the predetermined frame size number of audio samples. The audio encoder further has a controller switching from the first to the second encoder and for modifying the second framing rule or for modifying the start or the stop window of the first encoder.

公开(公告)号：EP2301024A1

公开(公告)日：2011-03-30

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：EP2491556A1

公开(公告)日：2012-08-29

申请号：EP10771705.0

申请日：2010-10-19

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. ,  VoiceAge Corporation ,  Koninklijke Philips Electronics N.V. ,  Dolby International AB

发明人： BESSETTE, Bruno ,  NEUENDORF, Max ,  GEIGER, Ralf ,  GOURNAY, Philippe ,  LEFEBVRE, Roch ,  GRILL, Bernhard ,  LECOMTE, Jeremie ,  BAYER, Stefan ,  RETTELBACH, Nikolaus ,  VILLEMOES, Lars ,  SALAMI, Redwan ,  DEN BRINKER, Albertus C.

IPC分类号： G10L19/14 ,  G10L19/02

CPC分类号： G10L19/03 ,  G10L19/0212 ,  G10L19/20 ,  G10L2019/0008

摘要： An audio signal decoder includes a transform domain path configured to obtain a time-domain representation of a portion of an audio content on the basis of a first set of spectral coefficients, a representation of an aliasing-cancellation stimulus signal and a plurality of linear-prediction-domain parameters. The transform domain path applies a spectrum shaping to the first set of spectral coefficients to obtain a spectrally-shaped version thereof. The transform domain path obtains a time-domain representation of the audio content on the basis of the spectrally-shaped version of the first set of spectral coefficients. The transform domain path includes an aliasing-cancellation stimulus filter to filter the aliasing-cancellation stimulus signal in dependence on at least a subset of the linear-prediction-domain parameters. The transform domain path also includes a combiner configured to combine the time-domain representation of the audio content with an aliasing-cancellation synthesis signal to obtain an aliasing reduced time-domain signal.

摘要翻译： 音频信号解码器包括被配置为获得第一组频谱系数的基础上的音频内容的一部分的一个时域表示变换域路径，一个混叠消除激励信号的表示和直链的多元 预测域参数。 变换域路径适用的频谱成形，以所述第一组频谱系数以获得其频谱形版本。 变换域路径获得的第一组频谱系数的频谱形版本的基础上音频内容的时域表示。 变换域路径包括在混叠消除刺激滤波器中的依赖于过滤的至少所述线性预测域参数的子集的混叠消除刺激信号。 因此，该变换域路径包括被配置为与上混叠消除合成信号，以获得混叠减小的时域信号的音频内容的时域表示的组合器。

公开(公告)号：EP2311034A1

公开(公告)日：2011-04-20

申请号：EP09777044.0

申请日：2009-07-08

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

发明人： LECOMTE, Jérémie ,  GOURNAY, Philippe ,  BAYER, Stefan ,  MULTRUS, Markus ,  RETTELBACH, Nikolaus

IPC分类号： G10L19/14

CPC分类号： G10L19/20

摘要： An audio encoder (100) adapted for encoding frames of a sampled audio signal to obtain encoded frames, wherein a frame comprises a number of time domain audio samples, comprising a predictive coding analysis stage (110) for determining information on coefficients of a synthesis filter and information on a prediction domain frame based on a frame of audio samples. The audio encoder (100) further comprises a frequency domain transformer (120) for transforming a frame of audio samples to the frequency domain to obtain a frame spectrum and an encoding domain decider (130). Moreover, the audio encoder (100) comprises a controller (140) for determining an information on a switching coefficient when the encoding domain decider decides that encoded data of a current frame is based on the information on the coefficients and the information on the prediction domain frame when encoded data of a previous frame was encoded based on a previous frame spectrum.

公开(公告)号：EP4362014A1

公开(公告)日：2024-05-01

申请号：EP24160719.1

申请日：2010-10-19

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. ,  VoiceAge Corporation ,  Koninklijke Philips N.V. ,  Dolby International AB

发明人： BESSETTE, Bruno ,  NEUENDORF, Max ,  GEIGER, Ralf ,  GOURNAY, Philippe ,  LEFEBVRE, Roch ,  GRILL, Bernhard ,  LECOMTE, Jérémie ,  BAYER, Stefan ,  RETTELBACH, Nikolaus ,  VILLEMOES, Lars ,  SALAMI, Redwan ,  DEN BRINKER, Albertus C.

IPC分类号： G10L19/18 ,  G10L19/02 ,  G10L19/04 ,  G10L19/03 ,  G10L19/12 ,  G10L19/20

CPC分类号： G10L19/0212 ,  G10L19/03 ,  G10L19/20 ,  G10L19/18 ,  G10L19/04 ,  G10L19/12

摘要： An audio signal decoder (200) for providing a decoded representation (212) of an audio content on the basis of an encoded representation (310) of the audio content comprises a transform domain path (230, 240, 242, 250, 260) configured to obtain a time-domain representation (212) of a portion of the audio content encoded in a transform-domain mode on the basis of a first set (220) of spectral coefficients, a representation (224) of an aliasing-cancellation stimulus signal and a plurality of linear-prediction-domain parameters (222). The transform domain path comprises a spectrum processor (230) configured to apply a spectrum shaping to the first set of spectral coefficients in dependence on at least a subset of the linear-prediction-domain parameters, to obtain a spectrally-shaped version (232) of the first set of spectral coefficients. The transform domain path comprises a first frequency-domain-to-time-domain converter (240) configured to obtain a time-domain representation of the audio content on the basis of the spectrally-shaped version of the first set of spectral coefficients. The transform domain path comprises an aliasing-cancellation stimulus filter configured to filter (250) the aliasing-cancellation stimulus signal (324) in dependence on at least a subset of the linear-prediction-domain parameters (222), to derive an aliasing-cancellation synthesis signal (252) from the aliasing-cancellation stimulus signal. The transform domain path also comprises a combiner (260) configured to combine the time-domain representation (242) of the audio content with the aliasing-cancellation synthesis signal (252), or a post-processed version thereof, to obtain an aliasing reduced time-domain signal.