公开(公告)号：US12125491B2

公开(公告)日：2024-10-22

申请号：US17100247

申请日：2020-11-20

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

发明人： Michael Schnabel ,  Goran Markovic ,  Ralph Sperschneider ,  Jérémie Lecomte ,  Christian Helmrich

IPC分类号： G10L19/005 ,  G10L19/00 ,  G10L19/002 ,  G10L19/012 ,  G10L19/02 ,  G10L19/06 ,  G10L19/07 ,  G10L19/083 ,  G10L19/09 ,  G10L19/12 ,  G10L19/22

CPC分类号： G10L19/005 ,  G10L19/002 ,  G10L19/012 ,  G10L19/06 ,  G10L19/07 ,  G10L19/083 ,  G10L19/09 ,  G10L19/12 ,  G10L19/22 ,  G10L2019/0002 ,  G10L2019/0011 ,  G10L2019/0016 ,  G10L19/0212

摘要： An apparatus for decoding an encoded audio signal to obtain a reconstructed audio signal is provided. The apparatus includes a receiving interface, a delay buffer and a sample processor for processing the selected audio signal samples to obtain reconstructed audio signal samples of the reconstructed audio signal. The sample selector is configured to select, if a current frame is received by the receiving interface and if the current frame being received by the receiving interface is not corrupted, the plurality of selected audio signal samples from the audio signal samples being stored in the delay buffer depending on a pitch lag information being included by the current frame.

公开(公告)号：US20240347066A1

公开(公告)日：2024-10-17

申请号：US18643227

申请日：2024-04-23

申请人： Telefonaktiebolaget LM Ericsson (publ)

发明人： Erik NORVELL ,  Fredrik JANSSON

IPC分类号： G10L19/012 ,  G10L19/00 ,  G10L19/008 ,  G10L19/032 ,  G10L19/04 ,  G10L19/06 ,  H04W76/28

CPC分类号： G10L19/012 ,  G10L19/0017 ,  G10L19/008 ,  G10L19/032 ,  G10L19/04 ,  G10L19/06 ,  H04W76/28

摘要： A method, system, and computer program to encode and decode a channel coherence parameter applied on a frequency band basis, where the coherence parameters of each frequency band form a coherence vector. The coherence vector is encoded and decoded using a predictive scheme followed by a variable bit rate entropy coding.

公开(公告)号：US11996110B2

公开(公告)日：2024-05-28

申请号：US17827316

申请日：2022-05-27

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

发明人： Guillaume Fuchs ,  Tom Baeckstroem ,  Ralf Geiger ,  Wolfgang Jaegers ,  Emmanuel Ravelli

IPC分类号： G10L19/02 ,  G10L19/087 ,  G10L19/12 ,  G10L19/26 ,  G10L19/06

CPC分类号： G10L19/087 ,  G10L19/02 ,  G10L19/12 ,  G10L19/26 ,  G10L19/06

摘要： A method and an apparatus for synthesizing an audio signal are described. A spectral tilt is applied to the code of a codebook used for synthesizing a current frame of the audio signal. The spectral tilt is based on the spectral tilt of the current frame of the audio signal. Further, an audio decoder operating in accordance with the inventive approach is described.

公开(公告)号：US11978460B2

公开(公告)日：2024-05-07

申请号：US17817251

申请日：2022-08-03

申请人： Telefonaktiebolaget LM Ericsson (publ)

发明人： Erik Norvell ,  Fredrik Jansson

IPC分类号： G10L19/012 ,  G10L19/00 ,  G10L19/008 ,  G10L19/032 ,  G10L19/04 ,  G10L19/06 ,  H04W76/28

CPC分类号： G10L19/012 ,  G10L19/0017 ,  G10L19/008 ,  G10L19/032 ,  G10L19/04 ,  G10L19/06 ,  H04W76/28

摘要： A method, system, and computer program to encode and decode a channel coherence parameter applied on a frequency band basis, where the coherence parameters of each frequency band form a coherence vector. The coherence vector is encoded and decoded using a predictive scheme followed by a variable bit rate entropy coding.

公开(公告)号：US20240119953A1

公开(公告)日：2024-04-11

申请号：US18529840

申请日：2023-12-05

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

发明人： Stefan DOEHLA ,  Bernhard GRILL ,  Christian HELMRICH ,  Nikolaus RETTELBACH

IPC分类号： G10L19/087 ,  G10L19/06 ,  G10L19/16 ,  G10L19/26

CPC分类号： G10L19/087 ,  G10L19/06 ,  G10L19/16 ,  G10L19/26 ,  G10L19/265 ,  G10L19/08

摘要： The invention provides an audio encoder including a combination of a linear predictive coding filter having a plurality of linear predictive coding coefficients and a time-frequency converter, wherein the combination is configured to filter and to convert a frame of the audio signal into a frequency domain in order to output a spectrum based on the frame and on the linear predictive coding coefficients; a low frequency emphasizer configured to calculate a processed spectrum based on the spectrum, wherein spectral lines of the processed spectrum representing a lower frequency than a reference spectral line are emphasized; and a control device configured to control the calculation of the processed spectrum by the low frequency emphasizer depending on the linear predictive coding coefficients of the linear predictive coding filter.

公开(公告)号：US11929084B2

公开(公告)日：2024-03-12

申请号：US18158035

申请日：2023-01-23

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

发明人： Sascha Disch ,  Martin Dietz ,  Markus Multrus ,  Guillaume Fuchs ,  Emmanuel Ravelli ,  Matthias Neusinger ,  Markus Schnell ,  Benjamin Schubert ,  Bernhard Grill

IPC分类号： G10L19/18 ,  G10L19/02 ,  G10L19/028 ,  G10L19/032 ,  G10L19/04 ,  G10L19/06 ,  G10L19/24 ,  G10L19/26 ,  G10L21/038 ,  G10L19/20

CPC分类号： G10L19/18 ,  G10L19/028 ,  G10L19/032 ,  G10L19/06 ,  G10L19/265 ,  G10L19/02 ,  G10L19/04 ,  G10L19/20 ,  G10L19/24 ,  G10L21/038

摘要： An audio encoder for encoding an audio signal has: a first encoding processor for encoding a first audio signal portion in a frequency domain, having: a time frequency converter for converting the first audio signal portion into a frequency domain representation; an analyzer for analyzing the frequency domain representation to determine first spectral portions to be encoded with a first spectral resolution and second regions to be encoded with a second resolution; and a spectral encoder for encoding the first spectral portions with the first spectral resolution and encoding the second portions with the second resolution; a second encoding processor for encoding a second different audio signal portion in the time domain; a controller for analyzing and determining, which portion of the audio signal is the first audio signal portion encoded in the frequency domain and which portion is the second audio signal portion encoded in the time domain; and an encoded signal former for forming an encoded audio signal having a first encoded signal portion for the first audio signal portion and a second encoded signal portion for the second portion.

公开(公告)号：US20240079020A1

公开(公告)日：2024-03-07

申请号：US18464986

申请日：2023-09-11

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

发明人： Florin GHIDO ,  Andreas NIEDERMEIER

IPC分类号： G10L19/06 ,  G10L19/00 ,  G10L19/02 ,  G10L19/028 ,  G10L19/032 ,  G10L19/038 ,  G10L21/038

CPC分类号： G10L19/06 ,  G10L19/00 ,  G10L19/02 ,  G10L19/0204 ,  G10L19/028 ,  G10L19/032 ,  G10L19/038 ,  G10L21/038

摘要： An improved concept for coding sample values of a spectral envelope is obtained by combining spectrotemporal prediction on the one hand and context-based entropy coding the residuals, on the other hand, while particularly determining the context for a current sample value dependent on a measure of a deviation between a pair of already coded/decoded sample values of the spectral envelope in a spectrotemporal neighborhood of the current sample value. The combination of the spectrotemporal prediction on the one hand and the context-based entropy coding of the prediction residuals with selecting the context depending on the deviation measure on the other hand harmonizes with the nature of spectral envelopes.

公开(公告)号：US11915713B2

公开(公告)日：2024-02-27

申请号：US18128494

申请日：2023-03-30

申请人： DOLBY INTERNATIONAL AB

发明人： Lars Villemoes

IPC分类号： G10L19/005 ,  G10L19/02 ,  G10L19/093 ,  G06F30/30 ,  G06F30/327 ,  G10L19/032 ,  G10L19/06 ,  G10L19/26 ,  G06F111/08

CPC分类号： G10L19/0208 ,  G06F30/30 ,  G06F30/327 ,  G10L19/005 ,  G10L19/0212 ,  G10L19/032 ,  G10L19/06 ,  G10L19/093 ,  G10L19/26 ,  G10L19/265 ,  G06F2111/08

摘要： The present document relates to audio source coding systems. In particular, the present document relates to audio source coding systems which make use of linear prediction in combination with a filterbank. A method for estimating a first sample (615) of a first subband signal in a first subband of an audio signal is described. The first subband signal of the audio signal is determined using an analysis filterbank (612) comprising a plurality of analysis filters which provide a plurality of subband signals in a plurality of subbands from the audio signal, respectively. The method comprises determining a model parameter (613) of a signal model; determining a prediction coefficient to be applied to a previous sample (614) of a first decoded subband signals derived from the first subband signal, based on the signal model, based on the model parameter (613) and based on the analysis filterbank (612); wherein a time slot of the previous sample (614) is prior to a time slot of the first sample (615); and determining an estimate of the first sample (615) by applying the prediction coefficient to the previous sample (614).

公开(公告)号：US20240055008A1

公开(公告)日：2024-02-15

申请号：US18383953

申请日：2023-10-26

申请人： Telefonaktiebolaget LM Ericsson (publ)

发明人： Fredrik Jansson ,  Erik Norvell ,  Tomas Jansson Toftgård

IPC分类号： G10L19/012 ,  G10L19/008 ,  G10L19/032 ,  G10L19/04 ,  G10L19/06 ,  G10L19/00

CPC分类号： G10L19/012 ,  G10L19/008 ,  G10L19/032 ,  G10L19/04 ,  G10L19/06 ,  G10L19/0017 ,  H04W76/28

摘要： A method and a transmitting node for supporting generation of comfort noise for at least two audio channels at a receiving node. The method is performed by a transmitting node. The method comprises determining spectral characteristics of audio signals on at least two input audio channels and determining a spatial coherence between the audio signals. The spatial coherence is associated with perceptual importance measures. A compressed representation of the spatial coherence is determined per frequency band by weighting the spatial coherence within each frequency band according to the perceptual importance measures. Information about the spectral characteristics and the compressed representation of the spatial coherence per frequency band is signaled to the receiving node for enabling the generation of the comfort noise at the receiving node.

公开(公告)号：US11869514B2

公开(公告)日：2024-01-09

申请号：US16849815

申请日：2020-04-15

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

发明人： Michael Schnabel ,  Goran Markovic ,  Ralph Sperschneider ,  Jérémie Lecomte ,  Christian Helmrich

IPC分类号： G10L19/005 ,  G10L19/06 ,  G10L19/002 ,  G10L19/012 ,  G10L19/083 ,  G10L19/09 ,  G10L19/12 ,  G10L19/07 ,  G10L19/22 ,  G10L19/02 ,  G10L19/00

CPC分类号： G10L19/005 ,  G10L19/002 ,  G10L19/012 ,  G10L19/06 ,  G10L19/07 ,  G10L19/083 ,  G10L19/09 ,  G10L19/12 ,  G10L19/22 ,  G10L19/0212 ,  G10L2019/0002 ,  G10L2019/0011 ,  G10L2019/0016

摘要： An apparatus for decoding an audio signal includes a receiving interface, wherein the receiving interface is configured to receive a first frame and a second frame. Moreover, the apparatus includes a noise level tracing unit for determining noise level information being represented in a tracing domain. Furthermore, the apparatus includes a first reconstruction unit for reconstructing a third audio signal portion of the audio signal depending on the noise level information and a second reconstruction unit for reconstructing a fourth audio signal portion depending on noise level information being represented in the second reconstruction domain.