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：US11694704B2

公开(公告)日：2023-07-04

申请号：US17144979

申请日：2021-01-08

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

发明人： Emmanuel Ravelli ,  Christian Helmrich ,  Goran Markovic ,  Matthias Neusinger ,  Sascha Disch ,  Manuel Jander ,  Martin Dietz

IPC分类号： G10L19/26 ,  G10L19/025 ,  G10L21/02 ,  G10L19/02

CPC分类号： G10L19/26 ,  G10L19/025 ,  G10L19/0212 ,  G10L21/02

摘要： An apparatus for processing an audio signal having associated therewith a pitch lag information and a gain information, includes a domain converter for converting a first domain representation of the audio signal into a second domain representation of the audio signal; and a harmonic post-filter for filtering the second domain representation of the audio signal, wherein the post-filter is based on a transfer function including a numerator and a denominator, wherein the numerator includes a gain value indicated by the gain information, and wherein the denominator includes an integer part of a pitch lag indicated by the pitch lag information and a multi-tap filter depending on a fractional part of the pitch lag.

公开(公告)号：US11250864B2

公开(公告)日：2022-02-15

申请号：US16141115

申请日：2018-09-25

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

发明人： Emmanuel Ravelli ,  Martin Dietz ,  Wolfgang Jaegers ,  Christian Neukam ,  Stefan Reuschl

IPC分类号： G10L19/012 ,  G10L19/02 ,  G10L19/22 ,  G10L21/0232

摘要： An apparatus for encoding audio information is provided. The apparatus for encoding audio information includes a selector for selecting a comfort noise generation mode from two or more comfort noise generation modes depending on a background noise characteristic of an audio input signal, and an encoding unit for encoding the audio information, wherein the audio information includes mode information indicating the selected comfort noise generation mode.

公开(公告)号：US11037580B2

公开(公告)日：2021-06-15

申请号：US16288018

申请日：2019-02-27

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

发明人： Emmanuel Ravelli ,  Christian Helmrich ,  Goran Markovic ,  Matthias Neusinger ,  Sascha Disch ,  Manuel Jander ,  Martin Dietz

IPC分类号： G10L19/26 ,  G10L19/025 ,  G10L21/02 ,  G10L19/02

摘要： An apparatus for processing an audio signal having associated therewith a pitch lag information and a gain information, includes a domain converter for converting a first domain representation of the audio signal into a second domain representation of the audio signal; and a harmonic post-filter for filtering the second domain representation of the audio signal, wherein the post-filter is based on a transfer function including a numerator and a denominator, wherein the numerator includes a gain value indicated by the gain information, and wherein the denominator includes an integer part of a pitch lag indicated by the pitch lag information and a multi-tap filter depending on a fractional part of the pitch lag.

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.

公开(公告)号：US20190304473A1

公开(公告)日：2019-10-03

申请号：US16445052

申请日：2019-06-18

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

发明人： Jeremie Lecomte ,  Michael Schnabel ,  Goran Markovic ,  Martin Dietz ,  Bernhard Neugebauer

IPC分类号： G10L19/005 ,  G10L19/107 ,  G10L25/90 ,  G10L19/125

摘要： An apparatus for determining an estimated pitch lag is provided. The apparatus includes an input interface for receiving a plurality of original pitch lag values, and a pitch lag estimator for estimating the estimated pitch lag. The pitch lag estimator is configured to estimate the estimated pitch lag depending on a plurality of original pitch lag values and depending on a plurality of information values, wherein for each original pitch lag value of the plurality of original pitch lag values, an information value of the plurality of information values is assigned to the original pitch lag value.

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.

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.

公开(公告)号：US09570085B2

公开(公告)日：2017-02-14

申请号：US14682015

申请日：2015-04-08

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

发明人： Sascha Disch ,  Benjamin Schubert ,  Ralf Geiger ,  Bernd Edler ,  Martin Dietz

IPC分类号： G10L19/02 ,  G10L19/032

CPC分类号： G10L19/02 ,  G10L19/0212 ,  G10L19/032

摘要： An apparatus for generating an audio output signal based on an encoded audio signal spectrum is provided. The apparatus has a processing unit for processing the encoded audio signal spectrum to obtain a decoded audio signal spectrum having a plurality of spectral coefficients, wherein each of the spectral coefficients has a spectral location within the encoded audio signal spectrum and a spectral value. Moreover, the apparatus has a pseudo coefficients determiner for determining one or more pseudo coefficients. Furthermore, the apparatus has a replacement unit for replacing at least one or more pseudo coefficients by a determined spectral pattern to obtain a modified audio signal spectrum, wherein each of at least two pattern coefficients has a spectral value. Moreover, the apparatus has a spectrum-time-conversion unit for converting the modified audio signal spectrum to a time-domain.

摘要翻译： 提供了一种用于基于经编码的音频信号频谱产生音频输出信号的装置。 该装置具有用于处理编码音频信号频谱以获得具有多个频谱系数的解码音频信号频谱的处理单元，其中每个频谱系数具有编码音频信号频谱内的频谱位置和频谱值。 此外，该装置具有用于确定一个或多个伪系数的伪系数确定器。 此外，该设备具有替换单元，用于通过确定的频谱图案来替换至少一个或多个伪系数，以获得修改的音频信号频谱，其中至少两个模式系数中的每一个具有频谱值。 此外，该装置具有用于将修改的音频信号频谱转换为时域的频谱 - 时间转换单元。