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1. 发明授权

US09583114B2 Generation of a comfort noise with high spectro-temporal resolution in discontinuous transmission of audio signals 有权
标题翻译：在音频信号的不连续传输中产生具有高分辨率分辨率的舒适噪声
公开(公告)号：US09583114B2
公开(公告)日：2017-02-28
申请号：US14744715
申请日：2015-06-19
申请人： Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
发明人： Anthony Lombard , Martin Dietz , Stephan Wilde , Emmanuel Ravelli , Panji Setiawan , Markus Multrus
IPC分类号： G10L19/002 , G10L19/012 , G10L19/24
CPC分类号： G10L19/012 , G10L19/002 , G10L19/24
摘要： The invention provides an audio decoder being configured for decoding a bitstream so as to produce therefrom an audio output signal, the bitstream including at least an active phase followed by at least an inactive phase, wherein the bitstream has encoded therein at least a silence insertion descriptor frame which describes a spectrum of a background noise, the audio decoder including: a silence insertion descriptor decoder configured to decode the silence insertion descriptor frame; a decoding device configured to reconstruct the audio output signal from the bitstream during the active phase; a spectral converter configured to determine a spectrum of the audio output signal; a noise estimator device configured to determine a first spectrum of the noise of the audio output signal; a resolution converter configured to establish a second spectrum of the noise of the audio output signal; a comfort noise spectrum estimation device; and a comfort noise generator.
摘要翻译：本发明提供了一种音频解码器，其被配置用于对比特流进行解码以便从其产生音频输出信号，所述比特流包括至少一个活动相位以及至少一个非活动阶段，其中所述比特流在其中编码至少一个静音插入描述符描述背景噪声的频谱的帧，所述音频解码器包括：沉默插入描述符解码器，被配置为解码所述静音插入描述符帧; 解码装置，被配置为在所述活动阶段期间重建来自所述比特流的音频输出信号; 被配置为确定所述音频输出信号的频谱的频谱转换器; 噪声估计器装置，被配置为确定音频输出信号的噪声的第一频谱; 分辨率转换器，被配置为建立音频输出信号的噪声的第二频谱; 舒适噪声谱估计装置; 和舒适噪声发生器。

2. 发明授权

US11335355B2 Estimating noise of an audio signal in the log2-domain 有权
公开(公告)号：US11335355B2
公开(公告)日：2022-05-17
申请号：US16995493
申请日：2020-08-17
申请人： Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
发明人： Benjamin Schubert , Manuel Jander , Anthony Lombard , Martin Dietz , Markus Multrus
IPC分类号： G10L21/0216 , G10L21/0232 , G10L25/18 , G10L19/26 , G10L25/03 , G10L25/21 , G10L21/038 , G10L19/025 , G10L19/012 , G10L19/02 , G10L21/02
摘要： A method is described that estimates noise in an audio signal. An energy value for the audio signal is estimated and converted into the logarithmic domain. A noise level for the audio signal is estimated based on the converted energy value.

3. 发明授权

US10339941B2 Comfort noise addition for modeling background noise at low bit-rates 有权
公开(公告)号：US10339941B2
公开(公告)日：2019-07-02
申请号：US16053525
申请日：2018-08-02
申请人： Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
发明人： Guillaume Fuchs , Anthony Lombard , Emmanuel Ravelli , Stefan Doehla , Jérémie Lecomte , Martin Dietz
IPC分类号： G10L19/012
摘要： The invention provides a decoder being configured for processing an encoded audio bitstream, wherein the decoder includes: a bitstream decoder configured to derive a decoded audio signal from the bitstream, wherein the decoded audio signal includes at least one decoded frame; a noise estimation device configured to produce a noise estimation signal containing an estimation of the level and/or the spectral shape of a noise in the decoded audio signal; a comfort noise generating device configured to derive a comfort noise signal from the noise estimation signal; and a combiner configured to combine the decoded frame of the decoded audio signal and the comfort noise signal in order to obtain an audio output signal.

4. 发明授权

US11056128B2 Apparatus and method for processing an audio signal using noise suppression filter values 有权
公开(公告)号：US11056128B2
公开(公告)日：2021-07-06
申请号：US16381770
申请日：2019-04-11
申请人： Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
发明人： Anthony Lombard , Bernhard Birzer , Dirk Mahne , Edwin Mabande , Fabian Kuech , Emanuel Habets , Paolo Annibale
IPC分类号： G10L21/0216 , G10L21/0324 , H03G3/00 , H03G7/00 , G10L21/0208 , G10L21/0316
摘要： An apparatus for processing an audio signal includes an audio signal analyzer and a filter. The audio signal analyzer is configured to analyze an audio signal to determine a plurality of noise suppression filter values for a plurality of bands of the audio signal, wherein the analyzer is configured to determine a noise suppression filter value so that a noise suppression filter value is greater than or equal to a minimum noise suppression filter value and so that the minimum noise suppression value depends on a characteristic of the audio signal. The filter is configured for filtering the audio signal, wherein the filter is adjusted based on the noise suppression filter values.

5. 发明授权

US10789963B2 Comfort noise addition for modeling background noise at low bit-rates 有权
公开(公告)号：US10789963B2
公开(公告)日：2020-09-29
申请号：US16448291
申请日：2019-06-21
申请人： Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
发明人： Guillaume Fuchs , Anthony Lombard , Emmanuel Ravelli , Stefan Doehla , Jérémie Lecomte , Martin Dietz
IPC分类号： G10L19/012
摘要： The invention provides a decoder being configured for processing an encoded audio bitstream, wherein the decoder includes: a bitstream decoder configured to derive a decoded audio signal from the bitstream, wherein the decoded audio signal includes at least one decoded frame; a noise estimation device configured to produce a noise estimation signal containing an estimation of the level and/or the spectral shape of a noise in the decoded audio signal; a comfort noise generating device configured to derive a comfort noise signal from the noise estimation signal; and a combiner configured to combine the decoded frame of the decoded audio signal and the comfort noise signal in order to obtain an audio output signal.

6. 发明授权

US10762912B2 Estimating noise in an audio signal in the LOG2-domain 有权
公开(公告)号：US10762912B2
公开(公告)日：2020-09-01
申请号：US16288000
申请日：2019-02-27
申请人： Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
发明人： Benjamin Schubert , Manuel Jander , Anthony Lombard , Martin Dietz , Markus Multrus
IPC分类号： G10L21/0216 , G10L21/0232 , G10L25/21 , G10L19/26 , G10L25/03 , G10L21/038 , G10L19/025 , G10L19/012 , G10L19/02 , G10L21/02
摘要： A method is described that estimates noise in an audio signal. An energy value for the audio signal is estimated and converted into the logarithmic domain. A noise level for the audio signal is estimated based on the converted energy value.

7. 发明申请

US20190267022A1 APPARATUS AND METHOD FOR PROCESSING AN AUDIO SIGNAL 审中-公开
公开(公告)号：US20190267022A1
公开(公告)日：2019-08-29
申请号：US16381770
申请日：2019-04-11
申请人： Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
发明人： Anthony Lombard , Bernhard Birzer , Dirk Mahne , Edwin Mabande , Fabian Kuech , Emanuel Habets , Paolo Annibale
IPC分类号： G10L21/0216 , G10L21/0324 , H03G3/00 , H03G7/00
摘要： An apparatus for processing an audio signal includes an audio signal analyzer and a filter. The audio signal analyzer is configured to analyze an audio signal to determine a plurality of noise suppression filter values for a plurality of bands of the audio signal, wherein the analyzer is configured to determine a noise suppression filter value so that a noise suppression filter value is greater than or equal to a minimum noise suppression filter value and so that the minimum noise suppression value depends on a characteristic of the audio signal. The filter is configured for filtering the audio signal, wherein the filter is adjusted based on the noise suppression filter values.

8. 发明授权

US10249317B2 Estimating noise of an audio signal in a LOG2-domain 有权
公开(公告)号：US10249317B2
公开(公告)日：2019-04-02
申请号：US15417234
申请日：2017-01-27
申请人： Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
发明人： Benjamin Schubert , Manuel Jander , Anthony Lombard , Martin Dietz , Markus Multrus
IPC分类号： G10L19/032 , G10L21/0216 , G10L25/21 , G10L21/0232 , G10L25/03 , G10L21/038 , G10L19/012
摘要： A method is described that estimates noise in an audio signal. An energy value for the audio signal is estimated and converted into the logarithmic domain. A noise level for the audio signal is estimated based on the converted energy value.

9. 发明授权

US10147432B2 Comfort noise addition for modeling background noise at low bit-rates 有权
公开(公告)号：US10147432B2
公开(公告)日：2018-12-04
申请号：US14744788
申请日：2015-06-19
申请人： Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
发明人： Guillaume Fuchs , Anthony Lombard , Emmanuel Ravelli , Stefan Doehla , Jeremie Lecomte , Martin Dietz
IPC分类号： G10L19/012
摘要： The invention provides a decoder being configured for processing an encoded audio bitstream, wherein the decoder includes: a bitstream decoder configured to derive a decoded audio signal from the bitstream, wherein the decoded audio signal includes at least one decoded frame; a noise estimation device configured to produce a noise estimation signal containing an estimation of the level and/or the spectral shape of a noise in the decoded audio signal; a comfort noise generating device configured to derive a comfort noise signal from the noise estimation signal; and a combiner configured to combine the decoded frame of the decoded audio signal and the comfort noise signal in order to obtain an audio output signal.

10. 发明授权

US08825496B2 Noise generation in audio codecs 有权
标题翻译：音频编解码器产生噪声
公开(公告)号：US08825496B2
公开(公告)日：2014-09-02
申请号：US13966551
申请日：2013-08-14
申请人： Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
发明人： Panji Setiawan , Stephan Wilde , Anthony Lombard , Martin Dietz
IPC分类号： G10L19/00
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
摘要： The spectral domain is efficiently used in order to parameterize the background noise using a background noise estimator configured to determine a parametric background noise estimate based on a spectral decomposition representation of an input audio signal so that the parametric background noise estimate spectrally describes a spectral envelope of a background noise of the input audio signal, thereby yielding a background noise synthesis which is more realistic and thus leads to a more transparent active to inactive phase switching.
摘要翻译：有效地使用频域以便使用背景噪声估计器来参数化背景噪声，背景噪声估计器被配置为基于输入音频信号的频谱分解表示来确定参数背景噪声估计，使得参数背景噪声估计频谱地描述输入音频信号的背景噪声，从而产生更现实的背景噪声合成，从而导致对无源相位切换的更透明的活动。

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