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公开(公告)号：EP2951814B1
公开(公告)日：2017-05-10
申请号：EP14701984.8
申请日：2014-01-28
CPC分类号： G10L19/087 , G10L19/0212 , G10L19/06 , G10L19/08 , G10L19/16 , G10L19/26 , G10L19/265
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.
摘要翻译： 本发明提供一种音频编码器，其包括具有多个线性预测编码系数的线性预测编码滤波器和时间 - 频率转换器的组合，其中该组合被配置为滤波并将该音频信号的帧转换为频域 以便基于帧和线性预测编码系数输出频谱; 配置为基于频谱计算处理频谱的低频增强器，其中强调表示比参考频谱线更低频率的处理频谱的频谱线; 以及控制装置，被配置为根据线性预测编码滤波器的线性预测编码系数来控制低频增强器对经处理频谱的计算。
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92.发明授权AUDIO SIGNAL ENCODER, AUDIO SIGNAL DECODER, METHOD FOR PROVIDING AN ENCODED REPRESENTATION OF AN AUDIO CONTENT, METHOD FOR PROVIDING A DECODED REPRESENTATION OF AN AUDIO CONTENT AND COMPUTER PROGRAM FOR USE IN LOW DELAY APPLICATIONS 有权音频信号编码器，音频信号解码器，方法提供音频内容，方法的编码表示，用于提供使用音频内容和计算机程序的解码表示在低延迟的场合
公开(公告)号：EP2473995B9
公开(公告)日：2016-12-21
申请号：EP10768928.3
申请日：2010-10-19
发明人： GEIGER, Ralf , SCHNELL, Markus , LECOMTE, Jérémie , SCHMIDT, Konstantin , FUCHS, Guillaume , RETTELBACH, Nikolaus
IPC分类号： G10L19/04 , G10L19/02 , G10L19/022 , G10L19/20 , G10L19/18
CPC分类号： G10L19/0212 , G10L19/022 , G10L19/20
摘要： An audio signal encoder includes a transform-domain path which obtains spectral coefficients and noise-shaping information on the basis of a portion of the audio content, and which windows a time-domain representation of the audio content and applies a time-domain-to-frequency-domain conversion. The audio signal decoder includes a CELP path to obtain a code-excitation information and a LPC parameter information. A converter applies a predetermined asymmetric analysis window in both if a current portion is followed by a subsequent portion to be encoded in the transform-domain mode or in the CELP mode. Aliasing cancellation information is selectively provided in the latter case.
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93.发明授权
公开(公告)号：EP2791938B8
公开(公告)日：2016-05-04
申请号：EP12809223.6
申请日：2012-12-14
发明人： HEUBERGER, Albert , EDLER, Bernd , RETTELBACH, Nikolaus , GEYERSBERGER, Stefan , HILPERT, Johannes
IPC分类号： G10L25/69 , G10L19/032
CPC分类号： G10L19/008 , G10L19/032 , G10L25/69
摘要： An audio encoding apparatus includes an encoder for encoding a time segment of an input audio signal to be encoded to obtain a corresponding encoded signal segment. The audio encoding apparatus further includes a decoder for decoding the encoded signal segment to obtain a re-decoded signal segment. A clipping detector is provided for analyzing the re-decoded signal segment with respect to at least one of an actual signal clipping or an perceptible signal clipping and for generating a corresponding clipping alert. The encoder is further configured to again encode the time segment of the audio signal with at least one modified encoding parameter resulting in a reduced clipping probability in response to the clipping alert.
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94.发明授权
公开(公告)号：EP2791938B1
公开(公告)日：2016-01-13
申请号：EP12809223.6
申请日：2012-12-14
申请人： Fraunhofer Gesellschaft zur Förderung der angewandten Forschung e.V. , Friedrich-Alexander-Universität Erlangen-Nürnberg
发明人： HEUBERGER, Albert , EDLER, Bernd , RETTELBACH, Nikolaus , GEYERSBERGER, Stefan , HILPERT, Johannes
IPC分类号： G10L25/69 , G10L19/032
CPC分类号： G10L19/008 , G10L19/032 , G10L25/69
摘要： An audio encoding apparatus includes an encoder for encoding a time segment of an input audio signal to be encoded to obtain a corresponding encoded signal segment. The audio encoding apparatus further includes a decoder for decoding the encoded signal segment to obtain a re-decoded signal segment. A clipping detector is provided for analyzing the re-decoded signal segment with respect to at least one of an actual signal clipping or an perceptible signal clipping and for generating a corresponding clipping alert. The encoder is further configured to again encode the time segment of the audio signal with at least one modified encoding parameter resulting in a reduced clipping probability in response to the clipping alert.
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95.发明授权
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96.发明授权AUDIO ENCODER, AUDIO DECODER, METHOD FOR ENCODING AN AUDIO INFORMATION, METHOD FOR DECODING AN AUDIO INFORMATION AND COMPUTER PROGRAM USING A MODIFICATION OF A NUMBER REPRESENTATION OF A NUMERIC PREVIOUS CONTEXT VALUE 有权音频编码器，音频解码方法用于编码音频信息，用于解码音频信息的方法和计算机程序使用先前上下文的数字表示的修改
公开(公告)号：EP2517200B1
公开(公告)日：2015-04-15
申请号：EP11700401.0
申请日：2011-01-11
发明人： FUCHS, Guillaume , MULTRUS, Markus , RETTELBACH, Nikolaus , SUBBARAMAN, Vignesh , WEISS, Oliver , GAYER, Marc , WARMBOLD, Patrick , GRIEBEL, Christian
CPC分类号： G10L19/02 , G10L19/0017 , G10L19/002
摘要： An audio decoder includes an arithmetic decoder for providing a plurality of decoded spectral values on the basis of an arithmetically encoded representation of the spectral values, and a frequency-domain-to-time-domain converter for providing a time-domain audio representation using the decoded spectral values. The arithmetic decoder selects a mapping rule describing a mapping of a code value onto a symbol code in dependence on a context state described by a numeric current context value. The arithmetic decoder determines the numeric current context value in dependence on a plurality of previously decoded spectral values. The arithmetic decoder evaluates a hash table, entries of which define both significant state values and boundaries of intervals of numeric context values, in order to select the mapping rule. A mapping rule index value is individually associated to a numeric context value being a significant state value.
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97.发明公开AUDIO ENCODER, AUDIO DECODER, METHOD FOR ENCODING AND DECODING AN AUDIO INFORMATION, AND COMPUTER PROGRAM OBTAINING A CONTEXT SUB-REGION VALUE ON THE BASIS OF A NORM OF PREVIOUSLY DECODED SPECTRAL VALUES 有权音频编码器，音频解码器，用于编码和解码音频信息，和计算机程序与语境在字段值在标准的基本计算方法之前已解码的频谱值
公开(公告)号：EP2524372A1
公开(公告)日：2012-11-21
申请号：EP11700402.8
申请日：2011-01-11
发明人： FUCHS, Guillaume , MULTRUS, Markus , RETTELBACH, Nikolaus , SUBBARAMAN, Vignesh , WEISS, Oliver , GAYER, Marc , WARMBOLD, Patrick , GRIEBEL, Christian
IPC分类号： G10L19/00
CPC分类号： G10L19/02 , G10L19/0017 , G10L19/002
摘要： An audio decoder includes an arithmetic decoder for providing a plurality of decoded spectral values on the basis of an arithmetically encoded representation of the spectral values, and a frequency-domain-to-time-domain converter for providing a time-domain audio representation using the decoded spectral values. The arithmetic decoder selects a mapping rule describing a mapping of a code value onto a symbol code in dependence on a context state described by a numeric current context value. The arithmetic decoder determines the numeric current context value in dependence on a plurality of previously decoded spectral values. The arithmetic decoder evaluates a hash table, entries of which define both significant state values and boundaries of intervals of numeric context values, in order to select the mapping rule. A mapping rule index value is individually associated to a numeric context value being a significant state value.
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98.发明公开AUDIO SIGNAL ENCODER, AUDIO SIGNAL DECODER, METHOD FOR ENCODING OR DECODING AN AUDIO SIGNAL USING AN ALIASING-CANCELLATION 审中-公开TONSIGNALCODIERER，声音信号的解码器，方法编码，解码的声音信号的手段混叠抑制
公开(公告)号：EP2491556A1
公开(公告)日：2012-08-29
申请号：EP10771705.0
申请日：2010-10-19
申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. , VoiceAge Corporation , Koninklijke Philips Electronics N.V. , Dolby International AB
发明人： BESSETTE, Bruno , NEUENDORF, Max , GEIGER, Ralf , GOURNAY, Philippe , LEFEBVRE, Roch , GRILL, Bernhard , LECOMTE, Jeremie , BAYER, Stefan , RETTELBACH, Nikolaus , VILLEMOES, Lars , SALAMI, Redwan , DEN BRINKER, Albertus C.
CPC分类号： G10L19/03 , G10L19/0212 , G10L19/20 , G10L2019/0008
摘要： An audio signal decoder includes a transform domain path configured to obtain a time-domain representation of a portion of an audio content on the basis of a first set of spectral coefficients, a representation of an aliasing-cancellation stimulus signal and a plurality of linear-prediction-domain parameters. The transform domain path applies a spectrum shaping to the first set of spectral coefficients to obtain a spectrally-shaped version thereof. The transform domain path obtains a time-domain representation of the audio content on the basis of the spectrally-shaped version of the first set of spectral coefficients. The transform domain path includes an aliasing-cancellation stimulus filter to filter the aliasing-cancellation stimulus signal in dependence on at least a subset of the linear-prediction-domain parameters. The transform domain path also includes a combiner configured to combine the time-domain representation of the audio content with an aliasing-cancellation synthesis signal to obtain an aliasing reduced time-domain signal.
摘要翻译： 音频信号解码器包括被配置为获得第一组频谱系数的基础上的音频内容的一部分的一个时域表示变换域路径，一个混叠消除激励信号的表示和直链的多元 预测域参数。 变换域路径适用的频谱成形，以所述第一组频谱系数以获得其频谱形版本。 变换域路径获得的第一组频谱系数的频谱形版本的基础上音频内容的时域表示。 变换域路径包括在混叠消除刺激滤波器中的依赖于过滤的至少所述线性预测域参数的子集的混叠消除刺激信号。 因此，该变换域路径包括被配置为与上混叠消除合成信号，以获得混叠减小的时域信号的音频内容的时域表示的组合器。
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99.发明公开MULTI-MODE AUDIO SIGNAL DECODER, MULTI-MODE AUDIO SIGNAL ENCODER, METHODS AND COMPUTER PROGRAM USING A LINEAR-PREDICTION-CODING BASED NOISE SHAPING 有权多模态的声音信号的解码器，多模态TONSIGNALCODIERER，基于线性预测编码方法和计算机程序的噪声整形
公开(公告)号：EP2471061A1
公开(公告)日：2012-07-04
申请号：EP10760726.9
申请日：2010-10-06
发明人： NEUENDORF, Max , FUCHS, Guillaume , RETTELBACH, Nikolaus , BAECKSTROEM, Tom , LECOMTE, Jèrèmie , HERRE, Jürgen
CPC分类号： G10L19/20 , G10L19/022
摘要： A multi-mode audio signal decoder has a spectral value determinator to obtain sets of decoded spectral coefficients for a plurality of portions of an audio content and a spectrum processor configured to apply a spectral shaping to a set of spectral coefficients in dependence on a set of linear-prediction-domain parameters for a portion of the audio content encoded in a linear-prediction mode, and in dependence on a set of scale factor parameters for a portion of the audio content encoded in a frequency-domain mode. The audio signal decoder has a frequency-domain-to-time-domain converter configured to obtain a time-domain audio representation on the basis of a spectrally-shaped set of decoded spectral coefficients for a portion of the audio content encoded in the linear-prediction mode and for a portion of the audio content encoded in the frequency domain mode. An audio signal encoder is also described.
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100.发明公开
公开(公告)号：EP2311034A1
公开(公告)日：2011-04-20
申请号：EP09777044.0
申请日：2009-07-08
IPC分类号： G10L19/14
CPC分类号： G10L19/20
摘要： An audio encoder (100) adapted for encoding frames of a sampled audio signal to obtain encoded frames, wherein a frame comprises a number of time domain audio samples, comprising a predictive coding analysis stage (110) for determining information on coefficients of a synthesis filter and information on a prediction domain frame based on a frame of audio samples. The audio encoder (100) further comprises a frequency domain transformer (120) for transforming a frame of audio samples to the frequency domain to obtain a frame spectrum and an encoding domain decider (130). Moreover, the audio encoder (100) comprises a controller (140) for determining an information on a switching coefficient when the encoding domain decider decides that encoded data of a current frame is based on the information on the coefficients and the information on the prediction domain frame when encoded data of a previous frame was encoded based on a previous frame spectrum.
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