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公开(公告)号：EP1735774A2
公开(公告)日：2006-12-27
申请号：EP05718568.8
申请日：2005-03-25
IPC分类号： G10L19/00
CPC分类号： G10L19/008
摘要： There is described a multi-channel encoder (10) for processing input signals (300, 310, 320, 330, 340) conveyed in N input channels to generate corresponding output signals (480, 490) conveyed in M output channels together with complementary parametric data (370, 430, 450); M and N are integers wherein N>M. The encoder (10) includes a down-mixer for down-mixing the input signals (30, 310, 320, 330, 340) to generate the corresponding output signals (480, 490), the encoder also comprising an analyser for processing the input signals (300, 310, 320, 330, 340) to generate the parameter data (370, 430, 450), said parametric data describing mutual differences between the N channels of input signal to allow for regenerating during decoding one or more of the N channels of input signals from the M channels of output signal. Such an encoder (10) is capable of providing highly efficient data encoding and also of being backwards compatibility with relatively simpler decoders having fewer than N decoding output channels. The invention also concerns decoders compatible with such a multi-channel.
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公开(公告)号：EP1711938A1
公开(公告)日：2006-10-18
申请号：EP05702661.9
申请日：2005-01-13
IPC分类号： G10L19/02
CPC分类号： G10L19/0212 , G10L19/26
摘要： A decoder particularly, but not exclusively, for MPEG-1 layer III data signals, in which recovered spectral coefficients are transformed into time domain signal components, the time domain signal components then being transformed, using a forward transform which is orthogonally modulated with respect to the forward transform that was used at the encoder, to produce a set of second spectral coefficients. In this way, the first and second spectral coefficients may be used as complex-valued spectral coefficients which are amenable to post-processing. In the preferred embodiment, the complex-valued frequency components are, after post-processing, transformed to the time domain using an odd-frequency modulated Discrete Fourier Transform (DFT).
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公开(公告)号：EP1479071B1
公开(公告)日：2006-01-11
申请号：EP03739586.0
申请日：2003-01-17
发明人： VAN DE PAR, Steven, L., J., D., E. , KOHLRAUSCH, Armin, G. , DEN BRINKER, Albertus, C. , SCHUIJERS, Erik, G., P. , VAN SCHIJNDEL, Nicolle, H.
IPC分类号： G10L19/08
CPC分类号： G10L19/08
摘要： The invention provides coding (11) of an at least two-channel audio signal (L,R) by determining common frequencies (fcom) in the at least two channels (L,R) of the audio signal, which common frequencies occur in at least two of the at least two channels of the audio signal, and by representing respective sinusoidal components in respective channels at a given common frequency by a representation of the given common frequency (fcom) and a representation of respective amplitudes (A,DeltaA) of the respective sinusoidal components at the given common frequency.
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公开(公告)号：EP1568010A1
公开(公告)日：2005-08-31
申请号：EP03758495.0
申请日：2003-10-31
CPC分类号： G10L19/008 , G10L19/035
摘要： In the method of coding the audio signal, the values of first parameters (P1,1), which represent aspects of the audio signal at a first instant (ti), are calcul ated to obtain first calculated values (Al,i). The values of second parameters P2,i), which represent the aspects of the audio signal at a second, later, instant (t2), are calculated to obtain the second calculated values (A2,i). The number of the first parameters (Pl,i) and the number of the second parameters (P2,i) differ. A subset (SUS2,i) of the second parameters (P2,i) is associated with a particular portion (SFRAi) of a frequency range (FR) of the audio signal This frequency range (FR) of the audio signal is preferably selected to cover all the f requencies present in the audio signal. The values (A2,i) of the subset (SUS2,i) of the second parameters (P2,i) are coded based on a difference of this subset (SUS2,i) and a subset (SUS1,i) of the first calculated value(s) (Al,i) associate d with substantially this same particular portion (SFRAi) of the frequency range (FR). Thus the differentially coded values (7) of the second parameters (P2,i) are obtained by coding the difference of the values of second parameters (P2,i and first parameters (P1,i) which are associated with substantially the same frequency subrange (SFRAi). This allows to differential code the parameters (Pl,I P2,i) even if the number of the parameters changes in time.
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公开(公告)号：EP1527441A2
公开(公告)日：2005-05-04
申请号：EP03764067.9
申请日：2003-07-11
IPC分类号： G10L19/06
CPC分类号： G10L19/07
摘要： According to a first aspect of the invention, at least part of an audio signal is coded in order to obtain an encoded signal, the coding comprising predictive coding the at least part of the audio signal in order to obtain prediction coefficients which represent temporal properties, such as a temporal envelope, of the at least part of the audio signal, transforming the prediction coefficients into a set of times representing the prediction coefficients, and including the set of times in the encoded signal. Especially the use of a time domain derivative or equivalent of the Line Spectral Representation is advantageous in coding such prediction coefficients, because with this technique times or time instants are well defined which makes them more suitable for further encoding. For overlapping frame analysis/synthesis for the temporal envelope, redundancy in the Line Spectral Representation at the overlap can be exploited. Embodiments of the invention exploit this redundancy in an advantageous manner.
摘要翻译： 根据本发明的第一方面，对音频信号的至少一部分进行编码以便获得编码信号，该编码包括对音频信号的至少一部分进行预测编码以便获得表示时间特性的预测系数， 例如音频信号的至少一部分的时间包络，将预测系数变换成代表预测系数的时间集合，并且在编码信号中包括时间集合。 尤其是使用线谱表示的时域微分或等效方式在编码这样的预测系数方面是有利的，因为利用这种技术，时间或时刻被很好地定义，这使得它们更适合于进一步的编码。 对于时间包络的重叠帧分析/合成，可以利用重叠处的线谱表示中的冗余度。 本发明的实施例以有利的方式利用这种冗余。
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公开(公告)号：EP1902443B1
公开(公告)日：2009-06-03
申请号：EP06766049.8
申请日：2006-07-07
发明人： SCHUIJERS, Erik, G., P. , HOTHO, Gerard, H. , PURNHAGEN, Heiko , SCHILDBACH, Wolfgang, A. , HOERICH, Holger , KJOERLING, Hans , M., , RÖDÉN, Karl,J.
CPC分类号： G10L19/008 , H04S2420/03
摘要： An audio encoder (109) has a hierarchical encoding structure and generates a data stream comprising one or more audio channels as well as parametric audio encoding data. The encoder (109) comprises an encoding structure processor (305) which inserts decoder tree structure data into the data stream. The decoder tree structure data comprises at least one data value indicative of a channel split characteristic for an audio channel at a hierarchical layer of the hierarchical decoder structure and may specifically specify the decoder tree structures to be applied by a decoder. A decoder (115) comprises a receiver (401) which receives the data stream and a decoder structure processor (405) for generating the hierarchical decoder structure in response to the decoder tree structure data. A decode processor (403) then generates output audio channels from the data stream using the hierarchical decoder structure.
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公开(公告)号：EP1735774B1
公开(公告)日：2008-05-14
申请号：EP05718568.8
申请日：2005-03-25
IPC分类号： G10L19/00
CPC分类号： G10L19/008
摘要： There is described a multi-channel encoder (10; 600) for processing input signals conveyed in N input channels to generate corresponding output signals conveyed in M output channels together with complementary parametric data; M and N are integers wherein N>M. The encoder (10; 600) includes a down-mixer for down-mixing the input signals to generate the corresponding output signals, the encoder also comprising an analyser for processing the input signals to generate the parameter data, said parametric data describing mutual differences between the N channels of input signal to allow for regenerating during decoding one or more of the N channels of input signals from the M channels of output signal. Such an encoder (10; 600) is capable of providing highly efficient data encoding and also of being backwards compatibility with relatively simpler decoders having fewer than N decoding output channels. The invention also concerns decoders (800) compatible with such a multi-channel encoder (10; 600).
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公开(公告)号：EP1902443A2
公开(公告)日：2008-03-26
申请号：EP06766049.8
申请日：2006-07-07
发明人： SCHUIJERS, Erik, G., P. , HOTHO, Gerard, H. , PURNHAGEN, Heiko , SCHILDBACH, Wolfgang, A. , HORICH, Holger , KJORLING, Hans , M., , RÖDÉN, Karl,J.
CPC分类号： G10L19/008 , H04S2420/03
摘要： An audio encoder (109) has a hierarchical encoding structure and generates a data stream comprising one or more audio channels as well as parametric audio encoding data. The encoder (109) comprises an encoding structure processor (305) which inserts decoder tree structure data into the data stream. The decoder tree structure data comprises at least one data value indicative of a channel split characteristic for an audio channel at a hierarchical layer of the hierarchical decoder structure and may specifically specify the decoder tree structures to be applied by a decoder. A decoder (115) comprises a receiver (401) which receives the data stream and a decoder structure processor (405) for generating the hierarchical decoder structure in response to the decoder tree structure data. A decode processor (403) then generates output audio channels from the data stream using the hierarchical decoder structure.
摘要翻译： 音频编码器（109）具有分层编码结构并且生成包括一个或多个音频声道以及参数音频编码数据的数据流。 编码器（109）包括将解码器树结构数据插入到数据流中的编码结构处理器（305）。 解码器树结构数据包括指示分层解码器结构的分层的音频信道的信道分离特性的至少一个数据值，并且可以具体指定将由解码器应用的解码器树结构。 解码器（115）包括接收数据流的接收器（401）和响应于解码器树结构数据生成分层解码器结构的解码器结构处理器（405）。 解码处理器（403）然后使用分层解码器结构从数据流生成输出音频通道。
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公开(公告)号：EP1769491A1
公开(公告)日：2007-04-04
申请号：EP05765606.8
申请日：2005-07-11
CPC分类号： H04S5/005 , G10L19/008
摘要： A device (1) for converting a first number (M) of input audio channels into a second, larger number (N) of output audio channels comprises: decorrelation units (3) for decomposing the input audio channels into a set of decorrelated auxiliary channels, at least one upmix unit (4) for combining the decorrelated auxiliary channels into the output audio channels, and at least one pre-processing unit (2) for pre-processing the input audio channels and feeding the pre-processed input audio channels to the decorrelation units (3). The pre-processing unit (2) and the upmix unit (4) are preferably controlled by audio parameters.
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公开(公告)号：EP1466320B1
公开(公告)日：2007-02-07
申请号：EP02781516.6
申请日：2002-11-13
IPC分类号： G10L19/14
CPC分类号： G10L19/022
摘要： Coding a signal is provided, wherein a first set of values is provided related to subsequent times in a first time interval of the signal, a second set of values is provided related to subsequent times in a second time interval of the signal, the first time interval having an overlap with the second time interval, the overlap including at least two subsequent times of the second interval, wherein at least one of the values of the second set related to the at least two subsequent times in the overlap is encoded with reference to a value of the first set which is closer in time to the at least one value of the second set than any other value in the second set.
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