公开(公告)号：US20240249734A1

公开(公告)日：2024-07-25

申请号：US18628556

申请日：2024-04-05

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

发明人： Markus Multrus ,  Bernhard Grill ,  Guillaume Fuchs ,  Stefan Geyersberger ,  Nikolaus Rettelbach ,  Virgilio Bacigalupo

IPC分类号： G10L19/02 ,  G10L19/022 ,  H03M7/30

CPC分类号： G10L19/02 ,  G10L19/022 ,  H03M7/30

摘要： An audio encoder for encoding segments of coefficients, the segments of coefficients representing different time or frequency resolutions of a sampled audio signal, the audio encoder including a processor for deriving a coding context for a currently encoded coefficient of a current segment based on a previously encoded coefficient of a previous segment, the previously encoded coefficient representing a different time or frequency resolution than the currently encoded coefficient. The audio encoder further includes an entropy encoder for encoding entropy the current coefficient based on the coding context to obtain an encoded audio stream.

公开(公告)号：US11869521B2

公开(公告)日：2024-01-09

申请号：US17322656

申请日：2021-05-17

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

发明人： Nikolaus Rettelbach ,  Bernhard Grill ,  Guillaume Fuchs ,  Stefan Geyersberger ,  Markus Multrus ,  Harald Popp ,  Juergen Herre ,  Stefan Wabnik ,  Gerald Schuller ,  Jens Hirschfeld

IPC分类号： G10L19/035 ,  G10L19/02 ,  G10L19/028 ,  G10L19/032 ,  G10L19/008 ,  G10L25/18

CPC分类号： G10L19/035 ,  G10L19/008 ,  G10L19/02 ,  G10L19/0204 ,  G10L19/028 ,  G10L19/032 ,  G10L25/18

摘要： An encoder for providing an audio stream on the basis of a transform-domain representation of an input audio signal includes a quantization error calculator configured to determine a multi-band quantization error over a plurality of frequency bands of the input audio signal for which separate band gain information is available. The encoder also includes an audio stream provider for providing the audio stream such that the audio stream includes information describing an audio content of the frequency bands and information describing the multi-band quantization error.
A decoder for providing a decoded representation of an audio signal on the basis of an encoded audio stream representing spectral components of frequency bands of the audio signal includes a noise filler for introducing noise into spectral components of a plurality of frequency bands to which separate frequency band gain information is associated on the basis of a common multi-band noise intensity value.

公开(公告)号：US20230260524A1

公开(公告)日：2023-08-17

申请号：US18301191

申请日：2023-04-14

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

发明人： Markus Multrus ,  Bernhard Grill ,  Guillaume Fuchs ,  Stefan Geyersberger ,  Nikolaus Rettelbach ,  Virgilio Bacigalupo

IPC分类号： G10L19/02 ,  G10L19/022 ,  H03M7/30

CPC分类号： G10L19/02 ,  G10L19/022 ,  H03M7/30

摘要： An audio encoder for encoding segments of coefficients, the segments of coefficients representing different time or frequency resolutions of a sampled audio signal, the audio encoder including a processor for deriving a coding context for a currently encoded coefficient of a current segment based on a previously encoded coefficient of a previous segment, the previously encoded coefficient representing a different time or frequency resolution than the currently encoded coefficient. The audio encoder further includes an entropy encoder for entropy encoding the current coefficient based on the coding context to obtain an encoded audio stream.

公开(公告)号：US10425757B2

公开(公告)日：2019-09-24

申请号：US16376076

申请日：2019-04-05

申请人： FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.

发明人： Juergen Herre ,  Johannes Hilpert ,  Stefan Geyersberger ,  Andreas Hoelzer ,  Claus Spenger

IPC分类号： G10L19/00 ,  H04S3/02 ,  G10L19/032 ,  G10L19/008 ,  H04S3/00

摘要： In processing a multi-channel audio signal having at least three original channels, a first downmix channel and a second downmix channel are provided, which are derived from the original channels. For a selected original channel, channel side information are calculated such that a downmix channel or a combined downmix channel including the first and the second downmix channels, when weighted using the channel side information, results in an approximation of the selected original channel. The channel side information and the first and second downmix channels form output data for transmission to a decoder. A low level decoder only decodes the first and second downmix channels. A high level decoder provides a full multi-channel audio signal based on the downmix channels and the channel side information. Since the channel side information only occupy a low number of bits and the decoder does not use dematrixing, efficient and high quality multi-channel extension for stereo players and enhanced multi-channel players is obtained.

公开(公告)号：US20190189136A1

公开(公告)日：2019-06-20

申请号：US16283591

申请日：2019-02-22

申请人： FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.

发明人： Markus Multrus ,  Bernhard Grill ,  Guillaume Fuchs ,  Stefan Geyersberger ,  Nikolaus Rettelbach ,  Virgilio Bacigalupo

IPC分类号： G10L19/02 ,  G10L19/022 ,  H03M7/30

摘要： An audio encoder for encoding segments of coefficients, the segments of coefficients representing different time or frequency resolutions of a sampled audio signal, the audio encoder including a processor for deriving a coding context for a currently encoded coefficient of a current segment based on a previously encoded coefficient of a previous segment, the previously encoded coefficient representing a different time or frequency resolution than the currently encoded coefficient. The audio encoder further includes an entropy encoder for entropy encoding the current coefficient based on the coding context to obtain an encoded audio stream.

公开(公告)号：US10242681B2

公开(公告)日：2019-03-26

申请号：US14589881

申请日：2015-01-05

申请人： FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.

发明人： Markus Multrus ,  Bernhard Grill ,  Guillaume Fuchs ,  Stefan Geyersberger ,  Nikolaus Rettelbach ,  Virgilio Bacigalupo

IPC分类号： G10L19/022 ,  G10L19/025 ,  H03M7/30 ,  G10L19/02

摘要： An audio encoder for encoding segments of coefficients, the segments of coefficients representing different time or frequency resolutions of a sampled audio signal, the audio encoder including a processor for deriving a coding context for a currently encoded coefficient of a current segment based on a previously encoded coefficient of a previous segment, the previously encoded coefficient representing a different time or frequency resolution than the currently encoded coefficient. The audio encoder further includes an entropy encoder for entropy encoding the current coefficient based on the coding context to obtain an encoded audio stream.

公开(公告)号：US10237674B2

公开(公告)日：2019-03-19

申请号：US16103295

申请日：2018-08-14

申请人： FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.

发明人： Juergen Herre ,  Johannes Hilpert ,  Stefan Geyersberger ,  Andreas Hoelzer ,  Claus Spenger

IPC分类号： G10L19/00 ,  H04S3/02 ,  G10L19/032 ,  H04S3/00 ,  G10L19/008

摘要： In processing a multi-channel audio signal having at least three original channels, a first downmix channel and a second downmix channel are provided, which are derived from the original channels. For a selected original channel of the original channels, channel side information are calculated such that a downmix channel or a combined downmix channel including the first and the second downmix channels, when weighted using the channel side information, results in an approximation of the selected original channel. The channel side information and the first and second downmix channels form output data to be transmitted to a decoder, which, in case of a low level decoder only decodes the first and second downmix channels or, in case of a high level decoder provides a full multi-channel audio signal based on the downmix channels and the channel side information. Since the channel side information only occupy a low number of bits, and since the decoder does not use dematrixing, an efficient and high quality multi-channel extension for stereo players and enhanced multi-channel players is obtained.

公开(公告)号：US20140236605A1

公开(公告)日：2014-08-21

申请号：US14157185

申请日：2014-01-16

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

发明人： Nikolaus Rettelbach ,  Bernhard Grill ,  Guillaume Fuchs ,  Stefan Geyersberger ,  Markus Multrus ,  Harald Popp ,  Juergen Herre ,  Stefan Wabnik ,  Gerald Schuller ,  Jens Hirschfeld

IPC分类号： G10L19/032

CPC分类号： G10L19/035 ,  G10L19/008 ,  G10L19/02 ,  G10L19/0204 ,  G10L19/028 ,  G10L19/032 ,  G10L25/18

摘要： An encoder for providing an audio stream on the basis of a transform-domain representation of an input audio signal includes a quantization error calculator configured to determine a multi-band quantization error over a plurality of frequency bands of the input audio signal for which separate band gain information is available. The encoder also includes an audio stream provider for providing the audio stream such that the audio stream includes information describing an audio content of the frequency bands and information describing the multi-band quantization error.A decoder for providing a decoded representation of an audio signal on the basis of an encoded audio stream representing spectral components of frequency bands of the audio signal includes a noise filler for introducing noise into spectral components of a plurality of frequency bands to which separate frequency band gain information is associated on the basis of a common multi-band noise intensity value.

摘要翻译： 一种用于基于输入音频信号的变换域表示来提供音频流的编码器包括：量化误差计算器，被配置为在输入音频信号的多个频带上确定多频带量化误差， 获取信息可用。 编码器还包括用于提供音频流的音频流提供器，使得音频流包括描述频带的音频内容的信息和描述多频带量化误差的信息。 用于基于表示音频信号的频带的频带的频谱分量的编码音频流提供音频信号的解码表示的解码器包括噪声填充器，用于将噪声引入多个频带的频谱分量中，分频频带 增益信息是根据共同的多频带噪声强度值相关联的。

公开(公告)号：US12080305B2

公开(公告)日：2024-09-03

申请号：US18522732

申请日：2023-11-29

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

发明人： Nikolaus Rettelbach ,  Bernhard Grill ,  Guillaume Fuchs ,  Stefan Geyersberger ,  Markus Multrus ,  Harald Popp ,  Juergen Herre ,  Stefan Wabnik ,  Gerald Schuller ,  Jens Hirschfeld

IPC分类号： G10L19/035 ,  G10L19/008 ,  G10L19/02 ,  G10L19/028 ,  G10L19/032 ,  G10L25/18

CPC分类号： G10L19/035 ,  G10L19/008 ,  G10L19/02 ,  G10L19/0204 ,  G10L19/028 ,  G10L19/032 ,  G10L25/18

摘要： An encoder for providing an audio stream on the basis of a transform- domain representation of an input audio signal includes a quantization error calculator configured to determine a multi-band quantization error over a plurality of frequency bands of the input audio signal for which separate band gain information is available. The encoder also includes an audio stream provider for providing the audio stream such that the audio stream includes information describing an audio content of the frequency bands and information describing the multi-band quantization error. A decoder for providing a decoded representation of an audio signal on the basis of an encoded audio stream representing spectral components of frequency bands of the audio signal includes a noise filler for introducing noise into spectral components of a plurality of frequency bands to which separate frequency band gain information is associated on the basis of a common multi-band noise intensity value.

公开(公告)号：US20240249736A1

公开(公告)日：2024-07-25

申请号：US18628632

申请日：2024-04-05

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

发明人： Markus Multrus ,  Bernhard Grill ,  Guillaume Fuchs ,  Stefan Geyersberger ,  Nikolaus Rettelbach ,  Virgilio Bacigalupo

IPC分类号： G10L19/02 ,  G10L19/022 ,  H03M7/30

CPC分类号： G10L19/02 ,  G10L19/022 ,  H03M7/30

摘要： An audio encoder for encoding segments of coefficients, the segments of coefficients representing different time or frequency resolutions of a sampled audio signal, the audio encoder including a processor for deriving a coding context for a currently encoded coefficient of a current segment based on a previously encoded coefficient of a previous segment, the previously encoded coefficient representing a different time or frequency resolution than the currently encoded coefficient. The audio encoder further includes an entropy encoder for entropy encoding the current coefficient based on the coding context to obtain an encoded audio stream.