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公开(公告)号：EP4371111A1
公开(公告)日：2024-05-22
申请号：EP22755036.5
申请日：2022-07-14
申请人： Google LLC
IPC分类号： G10L19/22 , H04N19/146 , H04N19/164 , H04L47/38 , H04L47/263
CPC分类号： G10L19/22 , H04N19/164 , H04L47/38 , H04L47/263 , H04N19/12 , H04N19/177
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公开(公告)号：EP3213323B1
公开(公告)日：2018-12-12
申请号：EP15801335.9
申请日：2015-10-29
IPC分类号： G10L19/008 , G10L19/22 , H04S3/00 , H04S7/00
CPC分类号： H04S3/008 , G10L19/008 , G10L19/22 , H04S7/00 , H04S2400/03 , H04S2420/03
摘要： A control section (1009) receives signaling (S) indicating one of at least two coding formats (F1, F2, F3) of an M-channel audio signal (L, LS, LB, TFL, TBL), the coding formats corresponding to different partitions of the channels of the audio signal into respective first and second groups (601, 602), wherein, in the indicated coding format, first and second channels (L1, L2) of a downmix signal correspond to linear combinations of the first and second groups, respectively; and a decoding section (900) reconstructs the audio signal based on the downmix signal and associated upmix parameters (αL). In the decoding section: a decorrelation input signal (D1, D2, D3) is determined based on the downmix signal and the indicated coding format; and wet and dry upmix coefficients, controlling linear mappings of the downmix signal and a decorrelated signal, generated based on the decorrelation input signal, are determined based on the upmix parameters and the indicated coding format.
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3.发明公开
公开(公告)号：EP3405950A1
公开(公告)日：2018-11-28
申请号：EP17700980.0
申请日：2017-01-20
发明人： RAVELLI, Emmanuel , SCHNELL, Markus , DÖHLA, Stefan , JÄGERS, Wolfgang , DIETZ, Martin , HELMRICH, Christian , MARKOVIC, Goran , FOTOPOULOU, Eleni , MULTRUS, Markus , BAYER, Stefan , FUCHS, Guillaume , HERRE, Jürgen
IPC分类号： G10L19/008 , G10L19/22 , G10L19/02
CPC分类号： G10L19/008 , G10L19/0204 , G10L19/0212 , G10L19/03 , G10L19/032 , 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.
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公开(公告)号：EP3039675B1
公开(公告)日：2018-10-03
申请号：EP14762180.9
申请日：2014-08-27
发明人： KOPPENS, Jeroen , MUESCH, Hannes
IPC分类号： G10L19/008 , G10L19/20 , G10L19/22 , G10L21/02 , G10L21/0324 , G10L21/0364 , H04R5/04
CPC分类号： G10L21/0364 , G10L19/008 , G10L19/20 , G10L19/22 , G10L21/0324 , H04R5/04 , H04S3/008 , H04S2400/15 , H04S2420/03
摘要： A method for hybrid speech enhancement which employs parametric-coded enhancement (or blend of parametric-coded and waveform-coded enhancement) under some signal conditions and waveform-coded enhancement (or a different blend of parametric-coded and waveform-coded enhancement) under other signal conditions. Other aspects are methods for generating a bitstream indicative of an audio program including speech and other content, such that hybrid speech enhancement can be performed on the program, a decoder including a buffer which stores at least one segment of an encoded audio bitstream generated by any embodiment of the inventive method, and a system or device (e.g., an encoder or decoder) configured (e.g., programmed) to perform any embodiment of the inventive method. At least some of speech enhancement operations are performed by a recipient audio decoder with Mid/Side speech enhancement metadata generated by an upstream audio encoder.
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公开(公告)号：EP3095117B1
公开(公告)日：2018-08-22
申请号：EP14877980.4
申请日：2014-01-13
IPC分类号： G10L19/008 , H04S3/00 , G10L19/22 , G10L25/03
CPC分类号： G10L19/008 , G10L19/0204 , G10L19/035 , G10L19/22 , G10L25/03 , G10L25/18 , H04R2499/11 , H04S1/007 , H04S3/008 , H04S2420/01 , H04S2420/07
摘要： It is disclosed inter alia a method comprising: estimating a value of entropy for a multi-channel audio signal; determining a channel configuration of the multi-channel audio signal from the value of entropy; and encoding the multi-channel audio signal, wherein the mode of encoding is dependent on the channel configuration.
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公开(公告)号：EP3352457A1
公开(公告)日：2018-07-25
申请号：EP18161810.9
申请日：2009-07-09
发明人： SUNG, Ho-Sang , ZHAN, Jie , CHOO, Ki-Hyun
摘要： One or more embodiments relate to a method and apparatus for determining the coding scheme of a signal, wherein the coding scheme of the signal is determined or changed based on whether a current frame corresponds to mute and the history of possibility of voice or music being present.
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公开(公告)号：EP3345369A1
公开(公告)日：2018-07-11
申请号：EP16767100.7
申请日：2016-09-02
发明人： MAMOLA, Robert
IPC分类号： H04L29/06
CPC分类号： G10L19/167 , G10L19/005 , G10L19/0204 , G10L19/22 , H04L27/183 , H04L27/3488 , H04L65/607
摘要： A multiresolution coding and modulation system for preserving audio continuity in a digital wireless audio system in harsh RF environments is provided that includes an audio codec that produces codewords having bits differing in perceptual importance coupled with a non-uniform hierarchical modulation scheme. When the wireless audio system is operating in a harsh RF environment, the RF SNR for decoding bits having a high perceptual importance may be decreased while the RF SNR for decoding bits having a low perceptual importance may be increased, while having no adverse effect on the latency of the wireless audio system. The audio may be subjectively degraded instead of muting the audio, which mitigates intermittent interference and multipath fading issues.
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公开(公告)号：EP3079152B1
公开(公告)日：2018-06-06
申请号：EP16166356.2
申请日：2011-06-23
IPC分类号： G10L19/26 , G10L19/02 , G10L19/107 , G10L19/20
CPC分类号： G10L19/26 , G10L19/02 , G10L19/0212 , G10L19/032 , G10L19/09 , G10L19/107 , G10L19/12 , G10L19/125 , G10L19/20 , G10L19/22 , G10L19/265 , G10L21/003 , G10L21/007 , G10L21/013
摘要： An audio encoding method is characterized by a decision being made as to whether the device which will decode the resulting bit stream should apply post filtering including attenuation of interharmonic noise. Hence, the decision whether to use the post filter, which is encoded in the bit stream, is taken separately from the decision as to the most suitable coding mode. In another aspect, there is provided an audio decoding method with a decoding step followed by a post-filtering step, including an amount of interharmonic noise attenuation determined by a variable gain, and being characterized in a step of setting the gain to zero or near-zero in accordance with post filtering information encoded in the bit stream signal. Such a method is well suited for mixed-origin audio signals by virtue of its capability to deactivate the post filter in dependence of the post filtering information only, hence independently of factors such as the current coding mode.
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公开(公告)号：EP2707687B1
公开(公告)日：2018-03-28
申请号：EP12782641.0
申请日：2012-05-09
申请人： VoiceAge Corporation
发明人： EKSLER, Vaclav
IPC分类号： G10L19/12 , G10L19/22 , G10L19/02 , G10L25/78 , G10L19/107 , G10L19/038 , G10L19/00
CPC分类号： G10L19/12 , G10L19/0212 , G10L19/038 , G10L19/107 , G10L19/22 , G10L25/78 , G10L2019/0005
摘要： Codebook Arrangement for use in coding an input sound signal includes First and Second Codebook Stages. First Codebook Stage includes one of a time-domain CELP codebook and a transform-domain codebook. Second Codebook Stage follows the first codebook stage and includes the other of the time-domain CELP codebook and the transform-domain codebook. Codebook Stage includes an adaptive codebook may be provided before First Codebook Stage. A selector may be provided to select an order of the time-domain CELP codebook and the transform-domain codebook in First and Second Codebook Stages, respectively, as a function of characteristics of the input sound signal. The selector may also be responsive to both the characteristics of the input sound signal and a bit rate of the codec using Codebook Arrangement to bypass Second Codebook Stage. Codebook Arrangement can be used in a coder of an input sound signal.
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公开(公告)号：EP2862166B1
公开(公告)日：2018-03-07
申请号：EP13728756.1
申请日：2013-06-14
发明人： FRIEDRICH, Tobias , WAGENBLASS, Tobias , LINZMEIER, Karsten , HOMM, Daniel , SPENGER, Claus-Christian , PURNHAGEN, Heiko
IPC分类号： G10L19/008 , G10L19/005
CPC分类号： G10L19/0017 , G10L19/005 , G10L19/008 , G10L19/22 , H04S3/008
摘要： A decoding system reconstructs an audio signal based on an input signal representing the audio signal by parametric coding or by n discretely coded channels. Parametric decoding proceeds on the basis of a core signal and mixing parameters controlling a spatial synthesis stage, which is supplied with a downmix signal. A controller is responsible for controlling the components of the decoding system, whether in steady-state parametric mode, steady-state discrete decoding mode and transitions between these. In defective frames of the input signal, which do not allow the mixing parameters to be decoded, the controller is configured to perform various error handling procedures including: parametric decoding using previous values of the mixing parameters; continuing parametric decoding for a limited duration, and/or outputting the core signal without spatial synthesis.
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