公开(公告)号：US08693696B2

公开(公告)日：2014-04-08

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： 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 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 downmix channel before entering the down-mix signal into an upmixer 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，然后再将上混合信号输入上混器或在上混合过程中。

公开(公告)号：US20150154970A1

公开(公告)日：2015-06-04

申请号：US14406670

申请日：2013-06-14

申请人： Heiko Purnhagen ,  Leif Sehlstrom ,  Karl Jonas Roeden ,  Kristofer Kjoerling ,  Lars Villemoes

发明人： Heiko Purnhagen ,  Leif Sehlstrom ,  Karl Jonas Roeden ,  Kristofer Kjoerling ,  Lars Villemoes

IPC分类号： G10L19/00

CPC分类号： G10L19/008 ,  G10L19/0017 ,  G10L19/18 ,  H04S3/008 ,  H04S2400/03 ,  H04S2420/03

摘要： A decoding system reconstructs an n-channel audio signal on the basis of an input signal representing the audio signal, in different time frames, either by parametric coding or as n discretely coded channels. Parametric decoding uses a core signal and mixing parameters controlling a spatial synthesis stage, to which a downmix signal is supplied from a downmix stage. The downmix stage realizes a projection on the downmix signal based on an n-channel input signal, either a discretely coded signal or a core signal padded with neutral-valued channels. The padding may take place either on the decoding side (reduced parametric coding) or the encoding side. In an embodiment, an audio decoder (110) in the decoding system pads the core signal during an initial portion of each reduced parametrically coded time frame directly succeeding a discretely coded time frame and during a final portion of each reduced parametrically coded time frame directly preceding a discretely coded time frame.

摘要翻译： 解码系统通过参数编码或作为n个离散编码的信道，在不同的时间帧中，基于表示音频信号的输入信号来重构n信道音频信号。 参数解码使用核心信号和控制空间合成阶段的混合参数，下混合信号从下混合级提供给它。 下混合阶段基于n沟道输入信号，即离散编码信号或用中性值通道填充的核心信号，实现对下混合信号的投影。 填充可以在解码侧（缩减参数编码）或编码侧进行。 在一个实施例中，解码系统中的音频解码器（110）在直接在离散编码的时间帧之后的每个缩减的参数编码时间帧的初始部分期间以及在直接前进的每个缩减的参数编码时间帧的最后部分期间， 离散编码的时间帧。

公开(公告)号：US08175280B2

公开(公告)日：2012-05-08

申请号：US11469799

申请日：2006-09-01

申请人： Lars Villemoes ,  Kristofer Kjoerling ,  Jeroen Breebaart

发明人： Lars Villemoes ,  Kristofer Kjoerling ,  Jeroen Breebaart

IPC分类号： H04R5/00

CPC分类号： H04S3/004 ,  H04S3/002 ,  H04S3/008 ,  H04S2400/01 ,  H04S2420/01

摘要： A headphone down mix signal can be efficiently derived from a parametric down mix of a multi-channel signal, when modified HRTFs (head related transfer functions) are derived from HRTFs of a multi-channel signal using a level parameter having information on a level relation between two channels of the multi-channel signals such that a modified HRTF is stronger influenced by the HRTF of a channel having a higher level than by the HRTF of a channel having a lower level. Modified HRTFs are derived within the decoding process taking into account the relative strength of the channels associated to the HRTFs. The HRTFs are thus modified such that a down mix signal of a parametric representation of a multi-channel signal can directly be used to synthesize the headphone down mix signal without the need of an intermediate full parametric multi-channel reconstruction of the parametric down mix.

摘要翻译： 当使用具有关于电平关系的信息的电平参数从多信道信号的HRTF导出修改的HRTF（头部相关传输函数）时，可以从多信道信号的参数下调混合中有效地导出耳机下混合信号。 在多信道信号的两个信道之间，使得修改的HRTF受到具有比具有较低电平的信道的HRTF高的信道的信道的HRTF更强的影响。 考虑到与HRTF相关联的信道的相对强度，在解码过程中导出修改的HRTF。 因此，HRTF被修改为使得多信道信号的参数表示的下混合信号可以直接用于合成耳机下混合信号，而不需要参数下调混合的中间全参数多通道重建。

公开(公告)号：US20110054914A1

公开(公告)日：2011-03-03

申请号：US12872482

申请日：2010-08-31

申请人： Kristofer Kjoerling ,  Lars Villemoes

发明人： Kristofer Kjoerling ,  Lars Villemoes

IPC分类号： G10L19/00

CPC分类号： G10L19/0204 ,  G10L19/00 ,  G10L19/025 ,  G10L19/083 ,  G10L19/12 ,  G10L19/26 ,  G10L25/12 ,  G10L25/18 ,  G10L25/21 ,  G10L25/48 ,  H03H17/0266

摘要： The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate of the real valued subband signals in the filterbank.

摘要翻译： 本发明提出了一种用于提高基于实数滤波器组的频谱包络调节器的性能的新方法。 通过自适应地锁定取决于通道的符号的相邻通道的增益值，如应用中定义的那样，实现了减少的混叠。 此外，增益计算期间信道的分组给出了滤波器组中实值子带信号的改进的能量估计。

公开(公告)号：US20070002971A1

公开(公告)日：2007-01-04

申请号：US11517900

申请日：2006-09-08

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： H04L27/00

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。

公开(公告)号：US08515083B2

公开(公告)日：2013-08-20

申请号：US11290370

申请日：2005-11-29

申请人： Lars Villemoes ,  Kristofer Kjoerling ,  Heiko Purnhagen ,  Jonas Roeden ,  Jeroen Breebaart ,  Gerard Hotho

发明人： Lars Villemoes ,  Kristofer Kjoerling ,  Heiko Purnhagen ,  Jonas Roeden ,  Jeroen Breebaart ,  Gerard Hotho

IPC分类号： H04R5/00 ,  G06F17/00 ,  G10L19/00

CPC分类号： G10L19/008 ,  G10L19/04 ,  H04S2420/03

摘要： For a multi-channel reconstruction of audio signals based on at least one base channel, an energy measure is used for compensating energy losses due to an predictive upmix. The energy measure can be applied in the encoder or the decoder. Furthermore, a decorrelated signal is added to output channels generated by an energy-loss introducing upmix procedure. The energy of the decorrelated signal is smaller than or equal to an energy error introduced by the predictive upmix. Thus, problems occurring for prediction based up-mix methods such as up-mixing signals that are coded with High Frequency Reconstruction techniques are solved, so that the correct correlation between the up-mixed channels is obtained or the up-mix is adapted to arbitrary down-mixes.

摘要翻译： 对于基于至少一个基本信道的音频信号的多声道重建，能量测量被用于由于预测上混补偿能量损失。 能量测量可以应用于编码器或解码器。 此外，将去相关信号添加到通过能量损失引入上混程序产生的输出通道。 解相关信号的能量小于或等于由预测上混引入的能量误差。 因此，解决了用于基于预测的上混合方法（例如用高频重建技术编码的上混合信号）所出现的问题，从而获得上混合信道之间的正确相关性，或者将混合信号适配为任意的 下混

公开(公告)号：US20070223708A1

公开(公告)日：2007-09-27

申请号：US11469799

申请日：2006-09-01

申请人： Lars Villemoes ,  Kristofer Kjoerling ,  Jeroen Breebaart

发明人： Lars Villemoes ,  Kristofer Kjoerling ,  Jeroen Breebaart

IPC分类号： H04R5/00

CPC分类号： H04S3/004 ,  H04S3/002 ,  H04S3/008 ,  H04S2400/01 ,  H04S2420/01

摘要： A headphone down mix signal can be efficiently derived from a parametric down mix of a multi-channel signal, when modified HRTFs (head related transfer functions) are derived from HRTFs of a multi-channel signal using a level parameter having information on a level relation between two channels of the multi-channel signals such that a modified HRTF is stronger influenced by the HRTF of a channel having a higher level than by the HRTF of a channel having a lower level. Modified HRTFs are derived within the decoding process taking into account the relative strength of the channels associated to the HRTFs. The HRTFs are thus modified such that a down mix signal of a parametric representation of a multi-channel signal can directly be used to synthesize the headphone down mix signal without the need of an intermediate full parametric multi-channel reconstruction of the parametric down mix.

摘要翻译： 当使用具有关于电平关系的信息的电平参数从多信道信号的HRTF导出修改的HRTF（头部相关传输函数）时，可以从多信道信号的参数下调混合中有效地导出耳机下混合信号。 在多信道信号的两个信道之间，使得修改的HRTF受到具有比具有较低电平的信道的HRTF高的信道的信道的HRTF更强的影响。 考虑到与HRTF相关联的信道的相对强度，在解码过程中导出修改的HRTF。 因此，HRTF被修改为使得多信道信号的参数表示的下混合信号可以直接用于合成耳机下混合信号，而不需要参数下调混合的中间全参数多通道重建。

公开(公告)号：US20060165237A1

公开(公告)日：2006-07-27

申请号：US11290370

申请日：2005-11-29

申请人： Lars Villemoes ,  Kristofer Kjoerling ,  Heiko Purnhagen ,  Jonas Roeden ,  Jeroen Breebaart ,  Gerard Hotho

发明人： Lars Villemoes ,  Kristofer Kjoerling ,  Heiko Purnhagen ,  Jonas Roeden ,  Jeroen Breebaart ,  Gerard Hotho

IPC分类号： H04R5/00 ,  H04B1/00

CPC分类号： G10L19/008 ,  G10L19/04 ,  H04S2420/03

摘要： For a multi-channel reconstruction of audio signals based on at least one base channel, an energy measure is used for compensating energy losses due to an predictive upmix. The energy measure can be applied in the encoder or the decoder. Furthermore, a decorrelated signal is added to output channels generated by an energy-loss introducing upmix procedure. The energy of the decorrelated signal is smaller than or equal to an energy error introduced by the predictive upmix. Thus, problems occurring for prediction based up-mix methods such as up-mixing signals that are coded with High Frequency Reconstruction techniques are solved, so that the correct correlation between the up-mixed channels is obtained or the up-mix is adapted to arbitrary down-mixes.

公开(公告)号：US20060140412A1

公开(公告)日：2006-06-29

申请号：US11290372

申请日：2005-11-29

申请人： Lars Villemoes ,  Kristofer Kjoerling ,  Heiko Purnhagen ,  Jonas Roeden ,  Jeroen Breebaart ,  Gerard Hotho

发明人： Lars Villemoes ,  Kristofer Kjoerling ,  Heiko Purnhagen ,  Jonas Roeden ,  Jeroen Breebaart ,  Gerard Hotho

IPC分类号： H04H5/00

CPC分类号： G10L19/008 ,  G10L19/04 ,  H04S2420/03

摘要： A multi-channel synthesizer for generating at least three output channels using an input signal having at least one base channel, the base channel being derived from the original multi-channel signal, the input signal further including at least two different up-mixing parameters, and an up-mixer mode indication indicating, in a first state that a first up-mixing rule is to be performed, and, indicating, in a second state, that a different second up-mixing rule is to be performed, uses an up-mixer for up-mixing the at least one base channel using the at least two different up-mixing parameters based on the first or the second up-mixing rule in response to the up-mixer mode indication so that the at least three output channels are obtained.

摘要翻译： 一种多通道合成器，用于使用具有至少一个基本通道的输入信号产生至少三个输出通道，所述基本通道从原始多通道信号导出，所述输入信号还包括至少两个不同的上混参数， 以及向上混合模式指示，其指示在要执行第一上调规则的第一状态中，并且在第二状态中指示要执行不同的第二上调规则，使用向上 混合器，用于响应于所述上混合器模式指示，基于所述第一或第二上混合规则，使用所述至少两个不同的上混合参数来上混合所述至少一个基本信道，使得所述至少三个输出信道 获得。

公开(公告)号：US08687829B2

公开(公告)日：2014-04-01

申请号：US12445699

申请日：2007-10-05

申请人： Johannes Hilpert ,  Karsten Linzmeier ,  Juergen Herre ,  Ralph Sperschneider ,  Andreas Hoelzer ,  Lars Villemoes ,  Jonas Engdegard ,  Heiko Purnhagen ,  Kristofer Kjoerling ,  Dirk Jeroen Breebaart ,  Werner Oomen

发明人： Johannes Hilpert ,  Karsten Linzmeier ,  Juergen Herre ,  Ralph Sperschneider ,  Andreas Hoelzer ,  Lars Villemoes ,  Jonas Engdegard ,  Heiko Purnhagen ,  Kristofer Kjoerling ,  Dirk Jeroen Breebaart ,  Werner Oomen

IPC分类号： H04R5/02

CPC分类号： G10L19/173 ,  G10L19/008 ,  H04S2420/03

摘要： A parameter transformer generates level parameters, indicating an energy relation between a first and a second audio channel of a multi-channel audio signal associated to a multi-channel loudspeaker configuration. The level parameter are generated based on object parameters for a plurality of audio objects associated to a down-mix channel, which is generated using object audio signals associated to the audio objects. The object parameters have an energy parameter indicating an energy of the object audio signal. To derive the coherence and the level parameters, a parameter generator is used, which combines the energy parameter and object rendering parameters, which depend on a desired rendering configuration.

摘要翻译： 参数变换器产生电平参数，指示与多声道扬声器配置相关联的多声道音频信号的第一和第二音频声道之间的能量关系。 基于与下混通道相关联的多个音频对象的对象参数生成电平参数，该对象参数是使用与音频对象相关联的对象音频信号生成的。 对象参数具有指示对象音频信号的能量的能量参数。 为了得出一致性和等级参数，使用参数生成器，其结合能量参数和对象渲染参数，其依赖于所需的呈现配置。