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1.发明公开Efficient and scalable parametric stereo coding for low bitrate audio coding applications 有权比利时的电影和电影“Parametrische StereocodierungfürAudiocodierungsanwendungen”
公开(公告)号：EP1603117A2
公开(公告)日：2005-12-07
申请号：EP05017007.5
申请日：2002-07-10
CPC分类号： G10L19/24 , G10L19/008 , G10L19/0204 , H04S1/007 , H04S3/002
摘要： The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.
摘要翻译： 本发明提供对现有技术的音频编解码器的改进，其通过对接收到的单声道信号的后处理而产生立体错觉。 这些改进通过提取在编码器侧的立体图像描述参数来实现，其被传送并随后用于在解码器侧控制立体声发生器。 此外，本发明通过使用新形式的参数立体声编码来弥合简单伪立体声方法和当前真实立体声编码方法之间的差距。 引入立体声平衡参数，其实现更高级的立体声模式，并且还构成了频谱包络的立体编码的新方法的基础，在采用引导HFR（高频重建）的系统中特别有用。 作为特殊情况，描述了这种立体声编码方案在可扩展的基于HFR的编解码器中的应用。
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2.发明公开ENHANCING THE PERFORMANCE OF CODING SYSTEMS THAT USE HIGH FREQUENCY RECONSTRUCTION METHODS 有权提高编码系统，其高频重建过程中使用的性能
公开(公告)号：EP1334484A1
公开(公告)日：2003-08-13
申请号：EP01983888.7
申请日：2001-11-14
发明人： HENN, Fredrik , EHRET, Andreas , SCHUG, Michael
CPC分类号： G10L19/18 , G10L21/038
摘要： The present invention relates to digital audio coding systems that employ high freuqency reconstruction (HFR) methods. It teaches how to improve the overall perforamcne of such systems, by means of an adaptation over time of the crossover frequency between the lowband coded by a core codec, and the highband coded by an HFR system. Different methods of establishing the instantaneous optimum choice of crossover frequency are introduced.
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3.发明公开EFFICIENT SPECTRAL ENVELOPE CODING USING VARIABLE TIME/FREQUENCY RESOLUTION AND TIME/FREQUENCY SWITCHING 有权使用可变时间/频率分辨率和时间/频率切换的有效谱包络编码
公开(公告)号：EP1216474A1
公开(公告)日：2002-06-26
申请号：EP00968271.7
申请日：2000-09-29
IPC分类号： G10L19/00
CPC分类号： G10L19/06 , G10L19/0208 , G10L19/022 , G10L19/035 , G10L21/038 , G10L25/18
摘要： The present invention provides a new method and an apparatus for spectral envelope encoding. The invention teaches how to perform and signal compactly a time/frequency mapping of the envelope representation, and further, encode the spectral envelope data efficiently using adaptive time/frequency directional coding. The method is applicable to both natural audio coding and speech coding systems and is especially suited for coders using SBR [WO 98/57436] or other high frequency reconstruction methods.
摘要翻译： 本发明提供了一种用于频谱包络编码的新方法和装置。 本发明教导如何紧凑地执行和发送包络表示的时间/频率映射，并进一步使用自适应时间/频率定向编码有效地编码频谱包络数据。 该方法适用于自然音频编码和语音编码系统，特别适用于使用SBR [WO 98/57436]或其他高频重建方法的编码器。
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4.发明公开Efficient and scalable parametric stereo coding for low bitrate audio coding applications 有权高效和可扩展参数立体声编码低比特率音频编码应用
公开(公告)号：EP1603117A3
公开(公告)日：2008-02-06
申请号：EP05017007.5
申请日：2002-07-10
CPC分类号： G10L19/24 , G10L19/008 , G10L19/0204 , H04S1/007 , H04S3/002
摘要： The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.
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5.发明公开
公开(公告)号：EP1600945A2
公开(公告)日：2005-11-30
申请号：EP05017011.7
申请日：2002-07-10
CPC分类号： G10L19/24 , G10L19/008 , G10L19/0204 , H04S1/007 , H04S3/002
摘要： The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.
摘要翻译： 本发明提供对现有技术的音频编解码器的改进，其通过对接收到的单声道信号的后处理而产生立体错觉。 这些改进通过提取在编码器侧的立体图像描述参数来实现，其被传送并随后用于在解码器侧控制立体声发生器。 此外，本发明通过使用新形式的参数立体声编码来弥合简单伪立体声方法和当前真实立体声编码方法之间的差距。 引入立体声平衡参数，其实现更高级的立体声模式，并且还构成了频谱包络的立体编码的新方法的基础，在采用引导HFR（高频重建）的系统中特别有用。 作为特殊情况，描述了这种立体声编码方案在可扩展的基于HFR的编解码器中的应用。
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公开(公告)号：EP1285436B1
公开(公告)日：2003-09-17
申请号：EP01937069.1
申请日：2001-05-23
IPC分类号： G10L21/02
CPC分类号： G10L19/0208 , G10L19/0017 , G10L19/0204 , G10L19/26 , G10L19/265 , G10L21/038
摘要： The method involves filtering a low band signal through the analysis part of a digital filter bank and obtaining a set of subband signals. A number of the subband signals are patched from consecutive channels of the filter bank to consecutive channels in the synthesis part of a digital filter bank. Each of the subband signals is patched from a channel with frequency index k to a channel with frequency index j not equal to k. The patched subband signals are adjusted in accordance to a desired spectral envelope. The adjusted subband signals are filtered through the synthesis part of a digital filter bank. An envelope adjusted and frequency translated or folded signal is obtained. An Independent claim is included for an apparatus for enhancement of source coding systems using high-frequency reconstruction techniques.
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公开(公告)号：EP1338000A1
公开(公告)日：2003-08-27
申请号：EP01272413.4
申请日：2001-12-19
IPC分类号： G10L19/00
CPC分类号： G10L21/038
摘要： The present invention relates to a new method for enhancement of source coding systems using high-frequency reconstruction. The invention teaches that tonal signals can be classified as either pulse-train-like or non-pulse-train-like. Relying on this classification, significant improvements on the perceived audio quality can be obtained by adaptive switching of transposers. The invention shows that the so-switched transposers must have fundamental differences in their characteristics.
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8.发明授权METHOD FOR REPRESENTING MULTI-CHANNEL AUDIO SIGNALS 有权VERFAHREN ZUR DARSTELLUNG VON MEHRKANAL-AUDIOSIGNALEN
公开(公告)号：EP1735775B1
公开(公告)日：2007-10-17
申请号：EP05735201.5
申请日：2005-04-12
IPC分类号： G10L19/00
CPC分类号： H04R5/00 , G10L19/008 , G10L19/0204 , G10L19/032 , G10L19/167 , G10L19/26 , H04S3/02 , H04S5/00 , H04S2400/01 , H04S2400/03
摘要： A parameter representation of a multi-channel signal having several original channels includes a parameter set, which, when used together with at least one down-mix channel allows a multi-channel reconstruction. An additional level parameter is calculated such that an energy of the at least one downmix channel weighted by the level parameter is equal to a sum of energies of the original channels. The additional level parameter is transmitted to a multi-channel reconstructor together with the parameter set or together with a down-mix channel. An apparatus for generating a multi-channel representation uses the level parameter to correct the energy of the at least one transmitted down-mix channel before entering the down-mix signal into an up-mixer or within the up-mixing process.
摘要翻译： 具有几个原始信道的多信道信号的参数表示包括参数集合，当与至少一个下行混频信道一起使用时，允许多信道重构。 计算附加电平参数，使得由电平参数加权的至少一个下混通道的能量等于原始通道的能量之和。 附加电平参数与参数组一起发送到多通道重构器，或与降混频道一起传输。 用于产生多通道表示的装置使用电平参数来校正至少一个发送的下混通道的能量，然后再将上混合信号进入上混频器或在上混合过程中。
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公开(公告)号：EP1829424A1
公开(公告)日：2007-09-05
申请号：EP06724045.7
申请日：2006-04-05
申请人： Coding Technologies Sweden AB , Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
IPC分类号： H04S3/00
CPC分类号： H04S7/307 , G10L19/008 , G10L19/02 , G10L19/26 , H04S3/00 , H04S5/005 , H04S2420/03
摘要： The temporal envelope of a decorrelated signal derived from an original signal can be shaped without introducing additional distortion, when a spectral flattener is used to spectrally flatten the spectrum of the decorrelated signal and the original signal prior to using the flattened spectra for deriving a gain factor describing the energy distribution between the flattened spectra, and when the so derived gain factor is used by an envelope shaper to timely shape the envelope of the decorrelated signal .
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10.发明授权ENHANCING THE PERFORMANCE OF CODING SYSTEMS THAT USE HIGH FREQUENCY RECONSTRUCTION METHODS 有权提高编码系统，其高频重建过程中使用的性能
公开(公告)号：EP1334484B1
公开(公告)日：2004-05-19
申请号：EP01983888.7
申请日：2001-11-14
发明人： HENN, Fredrik , EHRET, Andreas , SCHUG, Michael
CPC分类号： G10L19/18 , G10L21/038
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