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公开(公告)号：EP2082397B1
公开(公告)日：2011-12-28
申请号：EP07818758.0
申请日：2007-10-05
申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. , Dolby International AB , Koninklijke Philips Electronics N.V.
发明人： HILPERT, Johannes , LINZMEIER, Karsten , HERRE, Jürgen , SPERSCHNEIDER, Ralph , HÖLZER, Andreas , VILLEMOES, Lars , ENGDEGARD, Jonas , PURNHAGEN, Heiko , KJÖRLING, Kristofer , BREEBAART, Jeroen , OOMEN, Werner
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 loudspeake 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 comprise 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.
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公开(公告)号：EP2082397A2
公开(公告)日：2009-07-29
申请号：EP07818758.0
申请日：2007-10-05
申请人： Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung e.V. , Dolby Sweden AB , Koninklijke Philips Electronics N.V.
发明人： HILPERT, Johannes , LINZMEIER, Karsten , HERRE, Jürgen , SPERSCHNEIDER, Ralph , HÖLZER, Andreas , VILLEMOES, Lars , ENGDEGARD, Jonas , PURNHAGEN, Heiko , KJÖRLING, Kristofer , BREEBAART, Jeroen , OOMEN, Werner
IPC分类号： G10L19/14
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 loudspeake 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 comprise 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.
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3.发明授权
公开(公告)号：EP1738353B1
公开(公告)日：2007-08-29
申请号：EP05797620.1
申请日：2005-10-28
发明人： VILLEMOES, Lars , KJÖRLING, Kristofer , PURNHAGEN, Heiko , RÖDEN, Jonas , BREEBAART, Jeroen , HOTHO, Gerard
IPC分类号： G10L19/00
CPC分类号： G10L19/008 , G10L19/04 , H04S2420/03
摘要： A Multi-channel synthesiser for generating at least three output channels (110, 111, 112) using an input signal having at least one base channel, the base channel being derived from the original multi-channel signal (101, 102, 103), the input signal further including at least two different up-mixing parameters, and an up-mixer mode indication (1005) 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 (1005) so that the at least three output channels (110, 111, 112) are obtained.
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4.发明公开
公开(公告)号：EP1730726A1
公开(公告)日：2006-12-13
申请号：EP05811028.9
申请日：2005-10-28
发明人： VILLEMOES, Lars , KJÖRLING, Kristofer , PURNHAGEN, Heiko , RÖDEN, Jonas , BREEBAART, Jeroen , HOTHO, Gerard
IPC分类号： 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.
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5.发明授权GENERATION OF SPATIAL DOWNMIXES FROM PARAMETRIC REPRESENTATIONS OF MULTI CHANNEL SIGNALS 有权产量下降空间混合从参数表示多声道信号
公开(公告)号：EP1999999B1
公开(公告)日：2011-11-02
申请号：EP06777145.1
申请日：2006-09-01
IPC分类号： H04S3/00
CPC分类号： H04S3/004 , H04S3/002 , H04S3/008 , H04S2400/01 , H04S2420/01
摘要： A headphone down mix signal (314) can be efficiently derived from a parametric down mix of a multi-channel signal (312), when modified HRTFs (310) (head related transfer functions) are derived from HRTFs (308) of a multi-channel signal using a level parameter (306) having information on a level relation between two channels of the multi-channel signals such that a modified HRTF (310) is stronger influenced by the HRTF (308) of a channel having a higher level than by the HRTF (308) of a channel having a lower level. Modified HRTFs (310) are derived within the decoding process taking into account the relative strength of the channels associated to the HRTFs (308). The HRTFs (308) are thus modified such that a down mix signal (314) of a parametric representation of a multi-channel signal can directly be used to synthesize the headphone down mix signal (314) without the need of an intermediate full parametric multi-channel reconstruction of the parametric down mix.
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公开(公告)号：EP1730726B1
公开(公告)日：2007-10-10
申请号：EP05811028.9
申请日：2005-10-28
发明人： VILLEMOES, Lars , KJÖRLING, Kristofer , PURNHAGEN, Heiko , RÖDEN, Jonas , BREEBAART, Jeroen , HOTHO, Gerard
IPC分类号： 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.
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公开(公告)号：EP1738353A1
公开(公告)日：2007-01-03
申请号：EP05797620.1
申请日：2005-10-28
发明人： VILLEMOES, Lars , KJÖRLING, Kristofer , PURNHAGEN, Heiko , RÖDEN, Jonas , BREEBAART, Jeroen , HOTHO, Gerard
IPC分类号： G10L19/00
CPC分类号： G10L19/008 , G10L19/04 , H04S2420/03
摘要： A Multi-channel synthesiser for generating at least three output channels (110, 111, 112) using an input signal having at least one base channel, the base channel being derived from the original multi-channel signal (101, 102, 103), the input signal further including at least two different up-mixing parameters, and an up-mixer mode indication (1005) 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 (1005) so that the at least three output channels (110, 111, 112) are obtained.
摘要翻译： 一种多声道合成器，用于使用具有至少一个基本声道的输入信号来产生至少三个输出声道（110,111,112），所述基本声道是从原始多声道信号（101,102,103）导出的， 所述输入信号还包括至少两个不同的上混频参数，以及上混频器模式指示（1005），其在第一状态下指示要执行第一上混频规则，并且在第二状态中指示 ，要执行不同的第二上混合规则，基于第一或第二上混合规则，使用上混合器使用至少两个不同的上混合参数来上混合至少一个基本信道 响应于上混频器模式指示（1005），从而获得至少三个输出通道（110,111,112）。
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8.发明公开GENERATION OF SPATIAL DOWNMIXES FROM PARAMETRIC REPRESENTATIONS OF MULTI CHANNEL SIGNALS 有权产量下降空间混合从参数表示多声道信号
公开(公告)号：EP1999999A1
公开(公告)日：2008-12-10
申请号：EP06777145.1
申请日：2006-09-01
IPC分类号： H04S3/00
CPC分类号： H04S3/004 , H04S3/002 , H04S3/008 , H04S2400/01 , H04S2420/01
摘要： A headphone down mix signal (314) can be efficiently derived from a parametric down mix of a multi-channel signal (312), when modified HRTFs (310) (head related transfer functions) are derived from HRTFs (308) of a multi-channel signal using a level parameter (306) having information on a level relation between two channels of the multi-channel signals such that a modified HRTF (310) is stronger influenced by the HRTF (308) of a channel having a higher level than by the HRTF (308) of a channel having a lower level. Modified HRTFs (310) are derived within the decoding process taking into account the relative strength of the channels associated to the HRTFs (308). The HRTFs (308) are thus modified such that a down mix signal (314) of a parametric representation of a multi-channel signal can directly be used to synthesize the headphone down mix signal (314) without the need of an intermediate full parametric multi-channel reconstruction of the parametric down mix.
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公开(公告)号：EP2589046A1
公开(公告)日：2013-05-08
申请号：EP11743032.2
申请日：2011-06-23
IPC分类号： G10L19/14
CPC分类号： G10L19/26 , G10L19/02 , G10L19/0212 , G10L19/032 , G10L19/09 , G10L19/107 , G10L19/12 , G10L19/125 , G10L19/20 , G10L19/22 , G10L19/265 , G10L21/003 , G10L21/007 , G10L21/013
摘要： An audio encoding method is characterized by a decision being made as to whether the device which will decode the resulting bit stream should apply post filtering including attenuation of interharmonic noise. Hence, the decision whether to use the post filter, which is encoded in the bit stream, is taken separately from the decision as to the most suitable coding mode. In another aspect, there is provided an audio decoding method with a decoding step followed by a post-filtering step, including an amount of interharmonic noise attenuation determined by a variable gain, and being characterized in a step of setting the gain to zero or near-zero in accordance with post filtering information encoded in the bit stream signal. Such a method is well suited for mixed-origin audio signals by virtue of its capability to deactivate the post filter in dependence of the post filtering information only, hence independently of factors such as the current coding mode.
摘要翻译： 音频编码方法的特征在于，决定将解码所得到的比特流的装置是否应该应用包括衰减间谐波噪声的后置滤波。 因此，决定是否使用在比特流中编码的后置滤波器，与对最合适的编码模式的决定分开进行。 在另一方面，提供了一种具有解码步骤之后是后置滤波步骤的音频解码方法，该后置滤波步骤包括由可变增益确定的间谐波噪声衰减量，并且其特征在于将增益设置为零或接近 - 根据在比特流信号中编码的后滤波信息。 这种方法由于其仅根据后滤波信息去激活后置滤波器的能力，因此独立于诸如当前编码模式的因素，非常适合于混合源音频信号。
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公开(公告)号：EP2589046B1
公开(公告)日：2014-05-28
申请号：EP11743032.2
申请日：2011-06-23
IPC分类号： G10L19/26 , G10L19/02 , G10L19/107 , G10L19/20
CPC分类号： G10L19/26 , G10L19/02 , G10L19/0212 , G10L19/032 , G10L19/09 , G10L19/107 , G10L19/12 , G10L19/125 , G10L19/20 , G10L19/22 , G10L19/265 , G10L21/003 , G10L21/007 , G10L21/013
摘要： An audio encoding method is characterized by a decision being made as to whether the device which will decode the resulting bit stream should apply post filtering including attenuation of interharmonic noise. Hence, the decision whether to use the post filter, which is encoded in the bit stream, is taken separately from the decision as to the most suitable coding mode. In another aspect, there is provided an audio decoding method with a decoding step followed by a post-filtering step, including an amount of interharmonic noise attenuation determined by a variable gain, and being characterized in a step of setting the gain to zero or near-zero in accordance with post filtering information encoded in the bit stream signal. Such a method is well suited for mixed-origin audio signals by virtue of its capability to deactivate the post filter in dependence of the post filtering information only, hence independently of factors such as the current coding mode.
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