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    • 2. 发明申请
    • Audio signal encoding or decoding
    • 音频信号编码或解码
    • US20070067162A1
    • 2007-03-22
    • US10577106
    • 2004-10-28
    • Lars VillemoesPer EkstrandHeiko PurnhagenErik SchuijersFransiscus de Bont
    • Lars VillemoesPer EkstrandHeiko PurnhagenErik SchuijersFransiscus de Bont
    • G10L11/04
    • G10L19/008G10L21/038
    • 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.
    • 提供对音频信号进行编码,其中音频信号包括第一音频通道和第二音频通道,该编码包括在复调制滤波器组中对第一音频通道和第二音频通道中的每一个进行子带滤波,以提供第一多个子带信号 对于第一音频通道和用于第二音频通道的第二多个子带信号,对每个子带信号进行下采样以提供第一多个下采样子带信号和第二多个下采样子带信号,进一步子带滤波至少一个 在另一个滤波器组中进行下采样的子带信号,以便提供多个子子带信号,从子子带信号和未进一步子带滤波的那些下采样子带信号导出空间参数,以及导出包括导出的 从第一多个下采样子带信号导出的子带信号和 第二多个下采样子带信号。 此外,提供了解码,其中包括编码的单声道音频信号和一组空间参数的编码音频信号通过对编码的单声道音频声道进行解码以获得多个下采样的子带信号而被解码,进一步的子带滤波至少一个 在另一滤波器组中进行下采样的子带信号,以便提供多个子子带信号,以及从空间参数,子子带信号和未进一步子带滤波的那些下采样子带信号导出两个音频信道。