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51. 发明授权

US08116460B2 Efficient and scalable parametric stereo coding for low bitrate audio coding applications 有权
标题翻译：低比特率音频编码应用的高效可扩展的参数立体声编码
公开(公告)号：US08116460B2
公开(公告)日：2012-02-14
申请号：US11238982
申请日：2005-09-28
申请人： Fredrik Henn , Kristofer Kjorling , Lars Liljeryd , Jonas Roden , Jonas Engdegard
发明人： Fredrik Henn , Kristofer Kjorling , Lars Liljeryd , Jonas Roden , Jonas Engdegard
IPC分类号： H04R5/00 , G10L19/00
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产生立体幻象。这些改进通过提取在编码器侧描述参数的立体图像来实现，其被传输并随后用于在解码器侧对立体声发生器的控制。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现有的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。

52. 发明授权

US08081763B2 Efficient and scalable parametric stereo coding for low bitrate audio coding applications 有权
公开(公告)号：US08081763B2
公开(公告)日：2011-12-20
申请号：US12496926
申请日：2009-07-02
申请人： Fredrik Henn , Kristofer Kjorling , Lars Liljeryd , Jonas Roden , Jonas Engdegard
发明人： Fredrik Henn , Kristofer Kjorling , Lars Liljeryd , Jonas Roden , Jonas Engdegard
IPC分类号： H04R25/00 , G10L21/04
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.

53. 发明申请

US20110261966A1 Method and Apparatus for Applying Reverb to a Multi-Channel Audio Signal Using Spatial Cue Parameters 有权
标题翻译：使用空间提示参数将混响应用于多声道音频信号的方法和装置
公开(公告)号：US20110261966A1
公开(公告)日：2011-10-27
申请号：US13132321
申请日：2009-12-16
申请人： Jonas Engdegard
发明人： Jonas Engdegard
IPC分类号： H03G3/00 , H04R5/00
CPC分类号： G10L19/008 , H04S7/305
摘要： A method and system for applying reverb to an M-channel down-mixed audio input signal indicative of X individual audio channels, where X is greater than M. Typically, the method includes steps of: in response to spatial cue parameters indicative of spatial image of the downmixed input signal, generating Y discrete reverb channel signals, where each of the reverb channel signals at a time, t, is a linear combination of at least a subset of values of the individual audio channels at the time, t, and individually applying reverb to each of at least two of the reverb channel signals, thereby generating Y reverbed channel signals. Preferably, the reverb applied to at least one of the channel signals has a different reverb impulse response than does the reverb applied to at least one other one of the channel signals, t, is a linear combination of at least a sub-set of values of the individual audio channels at the time, t, and individually applying reverb to each of at least two of the reverb channel signals, thereby generating Y reverbed channel signals. Preferably, the reverb applied to at least one of the channel signals has a different reverb impulse response than does the reverb applied to at least one other one of the channel signals.
摘要翻译：一种用于将混响应用于指示X个独立音频通道的M通道下混音频输入信号的方法和系统，其中X大于M.通常，该方法包括以下步骤：响应于指示空间图像的空间提示参数产生下降混合输入信号，产生Y个离散混响通道信号，其中时间t的混响通道信号中的每一个是时间t上单独音频通道的值的至少一个子集的线性组合，并且分别对混响通道信号中的至少两个应用混响，从而产生Y个回波通道信号。优选地，应用于至少一个信道信号的混响具有与应用于至少另一个信道信号的混响相比的不同的混响脉冲响应，t是至少一组值的线性组合，并且分别将混响施加到混响通道信号中的至少两个中的每一个，从而产生Y回扫通道信号。优选地，应用于至少一个信道信号的混响具有与应用于至少一个其它信道信号的混响不同的混响脉冲响应。

54. 发明授权

US08019350B2 Audio coding using de-correlated signals 有权
标题翻译：使用去相关信号的音频编码
公开(公告)号：US08019350B2
公开(公告)日：2011-09-13
申请号：US11291009
申请日：2005-11-29
申请人： Heiko Purnhagen , Jonas Engdegard , Jeroen Breebaart , Erik Schuijers
发明人： Heiko Purnhagen , Jonas Engdegard , Jeroen Breebaart , Erik Schuijers
IPC分类号： H04W72/00 , H04R5/00
CPC分类号： H04S5/02 , G10L19/008
摘要： A multi-channel signal having at least three channels can be reconstructed such, that the reconstructed channels are at least partly de-correlated from each other using a downmixed signal derived from an original multi-channel signal and a set of de-correlated signals provided by a de-correlator (101) that derives the set of de-correlated signals from the down-mix signal, wherein the de-correlated signals within the set of de-correlated signals are mutually mostly orthogonal to each other, i.e. an orthogonality relation between channel pairs is satisfied within an orthogonality tolerance range.
摘要翻译：可以重建具有至少三个信道的多信道信号，使得使用从原始多信道信号导出的下混合信号和提供的一组去相关信号，使得重构信道彼此至少部分地相互关联通过去相关器（101），其从所述下混合信号中导出所述一组去相关信号，其中所述解相关信号组内的去相关信号彼此大致正交，即正交关系在正交公差范围内满足通道对之间。

55. 发明授权

US07974847B2 Advanced methods for interpolation and parameter signalling 有权
标题翻译：插值和参数信号的高级方法
公开(公告)号：US07974847B2
公开(公告)日：2011-07-05
申请号：US11286199
申请日：2005-11-22
申请人： Kristofer Kjoerling , Heiko Purnhagen , Jonas Engdegard , Jonas Roeden
发明人： Kristofer Kjoerling , Heiko Purnhagen , Jonas Engdegard , Jonas Roeden
IPC分类号： G10L19/00
CPC分类号： G10L19/008
摘要： A parameter calculator calculates lower resolution parametric information and interpolation information. On a decoder-side, an upmixer is used for generating the output channels. The upmixer uses high resolution parametric information generated by a parameter interpolator using the low resolution parametric information and decoder-side derived interpolation information or encoder-generated interpolation information for selecting one of a plurality of different interpolation characteristics.
摘要翻译：参数计算器计算低分辨率参数信息和插值信息。在解码器侧，上混频器用于产生输出通道。上混频器使用由参数内插器产生的高分辨率参数信息，其使用低分辨率参数信息和解码器侧导出的内插信息或编码器生成的用于选择多个不同插值特性之一的内插信息。

56. 发明申请

US20110075848A1 Apparatus and Method for Generating a Level Parameter and Apparatus and Method for Generating a Multi-Channel Representation 有权
标题翻译：用于生成电平参数的装置和方法以及用于产生多声道表示的装置和方法
公开(公告)号：US20110075848A1
公开(公告)日：2011-03-31
申请号：US12872507
申请日：2010-08-31
申请人： Heiko Purnhagen , Lars Villemoes , Jonas Engdegard , Jonas Roeden , Kristofer Kjoerling
发明人： Heiko Purnhagen , Lars Villemoes , Jonas Engdegard , Jonas Roeden , Kristofer Kjoerling
IPC分类号： H04H20/47
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：具有多个原始信道的多信道信号的参数表示包括参数集合，当与至少一个缩减混合信道一起使用时，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，或与降混频道一起发送。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，然后再将其进入上混频器或上混频过程。

57. 发明申请

US20110002470A1 Method for Representing Multi-Channel Audio Signals 有权
标题翻译：多通道音频信号表示方法
公开(公告)号：US20110002470A1
公开(公告)日：2011-01-06
申请号：US12882894
申请日：2010-09-15
申请人： Heiko Purnhagen , Lars Villemoes , Jonas Engdegard , Jonas Roeden , Kristofer Kjoerling
发明人： Heiko Purnhagen , Lars Villemoes , Jonas Engdegard , Jonas Roeden , Kristofer Kjoerling
IPC分类号： H04R5/00
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 multi-channel input signal having at least three original channels is represented by a parameter representation of the multi-channel signal. A first balance parameter, a first coherence parameter, or a first inter-channel time difference between a first channel pair and a second balance parameter, or a second coherence parameter, or a second inter-channel time difference parameter between a second channel pair are calculated. This set of parameters is the parameter representation of the original signals. The first channel pair has two channels, which are different from two channels of a second channel pair. Furthermore, each channel of the two channel pairs is one of the original channels, or a weighted combination of the original channels, and the first channel pair and the second channel pair include information on the three original channels.For multi-channel reconstruction purposes, the parameters are used in addition to down-mixing information to generate a selectable number of output channels in a scalable fashion.
摘要翻译：具有至少三个原始信道的多信道输入信号由多信道信号的参数表示来表示。在第二通道对之间的第一通道对和第二平衡参数之间的第一平衡参数，第一相干参数或第一通道间时间差或第二相干参数或第二通道间差参数是计算。这组参数是原始信号的参数表示。第一通道对具有两个通道，它们与第二通道对的两个通道不同。此外，两个信道对的每个信道是原始信道之一或原始信道的加权组合，并且第一信道对和第二信道对包括关于三个原始信道的信息。对于多通道重建的目的，除了降混信息之外还使用这些参数，以便以可缩放的方式生成可选数量的输出通道。

58. 发明授权

US07487097B2 Advanced processing based on a complex-exponential-modulated filterbank and adaptive time signalling methods 有权
标题翻译：基于复指数调制滤波器组和自适应时间信号方法的高级处理
公开(公告)号：US07487097B2
公开(公告)日：2009-02-03
申请号：US11260659
申请日：2005-10-26
申请人： Jonas Engdegard , Lars Villemoes
发明人： Jonas Engdegard , Lars Villemoes
IPC分类号： G01L19/02
CPC分类号： G10L19/008 , G10L19/0204 , H03H17/0266 , H04S5/00 , H04S2420/03
摘要： A synthesizer for generating a decorrelation signal using an input signal is operative on a plurality of subband signals, wherein a subband signal includes a sequence of at least two subband samples, the sequence of the subband samples representing a bandwidth of the subband signal, which is smaller than a bandwidth of the input signal. The synthesizer includes a filter stage for filtering each subband signal using a reverberation filter to obtain a plurality of reverberated subband signals, wherein a plurality of reverberated subband signals together represent the decorrelation signal. This decorrelation signal is used for reconstructing a signal based on a parametrically encoded stereo signal consisting of a mono signal and a coherence measure.
摘要翻译：用于使用输入信号产生去相关信号的合成器在多个子带信号上操作，其中子带信号包括至少两个子带样本的序列，子带样本的序列表示子带信号的带宽，其是小于输入信号的带宽。合成器包括滤波器级，用于使用混响滤波器对每个子带信号进行滤波以获得多个混响的子带信号，其中多个混响的子带信号一起表示解相关信号。该去相关信号用于基于由单声道信号和相干测量组成的参数编码的立体声信号来重构信号。

59. 发明申请

US20060233380A1 Multi-channel hierarchical audio coding with compact side information 有权
标题翻译：具有紧凑侧面信息的多通道分层音频编码
公开(公告)号：US20060233380A1
公开(公告)日：2006-10-19
申请号：US11314711
申请日：2005-12-21
申请人： Andreas Holzer , Jurgen Herre , Heiko Purnhagen , Kristofer Kjorling , Jonas Roden , Lars Villemoes , Jonas Engdegard , Jeroen Breebaart , Erik Schuijers , Werner Oomen
发明人： Andreas Holzer , Jurgen Herre , Heiko Purnhagen , Kristofer Kjorling , Jonas Roden , Lars Villemoes , Jonas Engdegard , Jeroen Breebaart , Erik Schuijers , Werner Oomen
IPC分类号： H04R5/00
CPC分类号： G10L19/008 , H04S3/00 , H04S2420/03
摘要： A parametric representation of a multi-channel audio signal describes the spatial properties of the audio signal well with compact side information when a coherence information, describing the coherence between a first and a second channel, is derived within a hierarchical encoding process only for channel pairs including a first channel having only information of a left side with respect to a listening position and including a second channel having only information from a right side with respect to a listening position. As within the hierarchical process the multiple audio channels of the audio signal are downmixed iteratively into monophonic channels, one can pick the relevant parameters from an encoding step involving only channel pairs carrying the information needed to describe the spatial properties of the multi-channel audio signal.
摘要翻译：多通道音频信号的参数化表示利用紧凑的侧信息来描述音频信号的空间属性，当描述第一和第二信道之间的相干性的相干信息仅在信道对的分级编码处理中导出时包括仅具有相对于收听位置的左侧的信息的第一频道，并且包括仅具有相对于收听位置的右侧的信息的第二频道。如在分层处理中，音频信号的多个音频通道被迭代地下混合成单声道，可以从仅涉及携带描述多声道音频信号的空间属性所需的信息的信道对的编码步骤中选择相关参数。

60. 发明申请

US20060133618A1 Stereo compatible multi-channel audio coding 有权
标题翻译：立体声兼容多声道音频编码
公开(公告)号：US20060133618A1
公开(公告)日：2006-06-22
申请号：US11286239
申请日：2005-11-23
申请人： Lars Villemoes , Heiko Purnhagen , Jonas Roeden , Jonas Engdegard , Jeroen Breebaart , Erik Schuijers
发明人： Lars Villemoes , Heiko Purnhagen , Jonas Roeden , Jonas Engdegard , Jeroen Breebaart , Erik Schuijers
IPC分类号： H04R5/00
CPC分类号： G10L19/008
摘要： A parametric representation of a multi-channel audio signal having parameters suited to be used together with a monophonic downmix signal to calculate a reconstruction of the multi-channel audio signal can efficiently be derived in a stereo-backwards compatible way when a parameter combiner is used to generate the parametric representation by combining a one or more spatial parameters and a stereo parameter resulting in a parametric representation having a decoder usable stereo parameter and an information on the one or more spatial parameters that represents, together with the decoder usable stereo parameter, the one or more spatial parameters.
摘要翻译：当使用参数组合器时，具有适合于与单声道下混信号一起使用以计算多声道音频信号的重建的参数的多声道音频信号的参数表示可以以立体声向后兼容的方式有效地导出通过组合一个或多个空间参数和立体声参数来产生参数表示，该立体参数导致具有解码器可用立体声参数的参数表示以及与解码器可用立体参数一起表示的一个或多个空间参数的信息，一个或多个空间参数。

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