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11 条记录 (耗时 0.013 秒)

    AUDIO SIGNAL ENCODING OR DECODING
    1.
    发明授权
    AUDIO SIGNAL ENCODING OR DECODING 有权
    音频信号编码或解码

    公开(公告)号：EP1683133B1

    公开(公告)日：2007-02-14

    申请号：EP04770333.5

    申请日：2004-10-28

    申请人： Koninklijke Philips Electronics N.V. ,  Coding Technologies AB

    发明人： VILLEMOES, Lars, F. ,  EKSTRAND, Per ,  PURNHAGEN, Heiko ,  SCHUIJERS, Erik, G., P. ,  DE BONT, Fransiscus M., J.

    IPC分类号： G10L19/00 ,  G10L21/02

    CPC分类号： G10L19/008 ,  G10L21/038

    摘要： Encoding an audio signal is provided wherein the audio signal includes a first audio channel and a second audio channel, the encoding comprising subband filtering each of the first audio channel and the second audio channel in a complex modulated filterbank to provide a first plurality of subband signals for the first audio channel and a second plurality of subband signals for the second audio channel, downsampling each of the subband signals to provide a first plurality of downsampled subband signals and a second plurality of downsampled subband signals, further subband filtering at least one of the downsampled subband signals in a further filterbank in order to provide a plurality of sub-subband signals, deriving spatial parameters from the sub-subband signals and from those downsampled subband signals that are not further subband filtered, and deriving a single channel audio signal comprising derived subband signals derived from the first plurality of downsampled subband signals and the second plurality of downsampled subband signals. Further, decoding is provided wherein an encoded audio signal comprising an encoded single channel audio signal and a set of spatial parameters is decoded by decoding the encoded single channel audio channel to obtain a plurality of downsampled subband signals, further subband filtering at least one of the downsampled subband signals in a further filterbank in order to provide a plurality of sub-subband signals, and deriving two audio channels from the spatial parameters, the sub-subband signals and those downsampled subband signals that are not further subband filtered.

    PARTIALLY COMPLEX MODULATED FILTER BANK
    4.
    发明公开
    PARTIALLY COMPLEX MODULATED FILTER BANK 有权
    局部复调制滤波器组

    公开(公告)号：EP1789954A1

    公开(公告)日：2007-05-30

    申请号：EP06776967.9

    申请日：2006-08-18

    申请人： Coding Technologies AB

    发明人： EKSTRAND, Per ,  VILLEMOES, Lars ,  PURNHAGEN, Heiko

    IPC分类号： G10L19/02

    CPC分类号： G10L19/0208

    摘要： An apparatus for processing a plurality of real-valued subband signals using a first real-valued subband signal and a second real-valued subband signal to provide at least a complex-valued subband signal comprises a multiband filter for providing an intermediate real-valued subband signal and a calculator for providing the complex-valued subband signal by combining a real-valued subband signal from the plurality of real-valued subband signals and the intermediate subband signal.

    AUDIO SIGNAL ENCODING OR DECODING
    5.
    发明公开
    AUDIO SIGNAL ENCODING OR DECODING 有权
    音频信号编码或解码

    公开(公告)号：EP1683133A1

    公开(公告)日：2006-07-26

    申请号：EP04770333.5

    申请日：2004-10-28

    申请人： Koninklijke Philips Electronics N.V. ,  Coding Technologies AB

    发明人： VILLEMOES, Lars, F. ,  EKSTRAND, Per ,  PURNHAGEN, Heiko ,  SCHUIJERS, Erik, G., P. ,  DE BONT, Fransiscus M., J.

    IPC分类号： G10L19/00 ,  G10L21/02

    CPC分类号： G10L19/008 ,  G10L21/038

    摘要： Encoding an audio signal is provided wherein the audio signal includes a first audio channel and a second audio channel, the encoding comprising subband filtering each of the first audio channel and the second audio channel in a complex modulated filterbank to provide a first plurality of subband signals for the first audio channel and a second plurality of subband signals for the second audio channel, downsampling each of the subband signals to provide a first plurality of downsampled subband signals and a second plurality of downsampled subband signals, further subband filtering at least one of the downsampled subband signals in a further filterbank in order to provide a plurality of sub-subband signals, deriving spatial parameters from the sub-subband signals and from those downsampled subband signals that are not further subband filtered, and deriving a single channel audio signal comprising derived subband signals derived from the first plurality of downsampled subband signals and the second plurality of downsampled subband signals. Further, decoding is provided wherein an encoded audio signal comprising an encoded single channel audio signal and a set of spatial parameters is decoded by decoding the encoded single channel audio channel to obtain a plurality of downsampled subband signals, further subband filtering at least one of the downsampled subband signals in a further filterbank in order to provide a plurality of sub-subband signals, and deriving two audio channels from the spatial parameters, the sub-subband signals and those downsampled subband signals that are not further subband filtered.

    ENHANCING SOURCE CODING SYSTEMS BY ADAPTIVE TRANSPOSITION
    6.
    发明授权
    ENHANCING SOURCE CODING SYSTEMS BY ADAPTIVE TRANSPOSITION 有权
    源代码系统的自适应BY换位改进

    公开(公告)号：EP1338000B1

    公开(公告)日：2004-04-28

    申请号：EP01272413.4

    申请日：2001-12-19

    申请人： Coding Technologies AB

    发明人： KJÖRLING, Kristofer ,  HENN, Fredrik ,  EKSTRAND, Per ,  VILLEMOES, Lars

    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.

    PARTIALLY COMPLEX MODULATED FILTER BANK
    8.
    发明授权
    PARTIALLY COMPLEX MODULATED FILTER BANK 有权
    局部复调制滤波器组

    公开(公告)号：EP1789954B1

    公开(公告)日：2008-01-02

    申请号：EP06776967.9

    申请日：2006-08-18

    申请人： Coding Technologies AB

    发明人： EKSTRAND, Per ,  VILLEMOES, Lars ,  PURNHAGEN, Heiko

    IPC分类号： G10L19/02

    CPC分类号： G10L19/0208

    摘要： An apparatus for processing a plurality of real-valued subband signals using a first real-valued subband signal and a second real-valued subband signal to provide at least a complex-valued subband signal comprises a multiband filter for providing an intermediate real-valued subband signal and a calculator for providing the complex-valued subband signal by combining a real-valued subband signal from the plurality of real-valued subband signals and the intermediate subband signal.