ENCODER, DECODER AND METHODS FOR SIGNAL-DEPENDENT ZOOM-TRANSFORM IN SPATIAL AUDIO OBJECT CODING
    9.
    发明公开
    ENCODER, DECODER AND METHODS FOR SIGNAL-DEPENDENT ZOOM-TRANSFORM IN SPATIAL AUDIO OBJECT CODING 审中-公开
    CODIERER,DECODIERER UND VERFAHRENFÜRSIGNALABHÄNGIGEZOOMUMWANDLUNG BEIM空间 - 音频对象编码

    公开(公告)号:EP2904610A1

    公开(公告)日:2015-08-12

    申请号:EP13776987.3

    申请日:2013-10-02

    摘要: A decoder for generating an audio output signal comprising one or more audio output channels from a downmix signal is provided. The downmix signal encodes one or more audio object signals. The decoder comprises a control unit (181) for setting an activation indication to an activation state depending on a signal property of at least one of the one or more audio object signals. Moreover, the decoder comprises a first analysis module (182) for transforming the downmix signal to obtain a first transformed downmix comprising a plurality of first subband channels. Furthermore, the decoder comprises a second analysis module (183) for generating, when the activation indication is set to the activation state, a second transformed downmix by transforming at least one of the first subband channels to obtain a plurality of second subband channels, wherein the second transformed downmix comprises the first subband channels which have not been transformed by the second analysis module and the second subband channels. Moreover, the decoder comprises an un-mixing unit (184), wherein the un-mixing unit (184) is configured to un-mix the second transformed downmix, when the activation indication is set to the activation state, based on parametric side information on the one or more audio object signals to obtain the audio output signal, and to un-mix the first transformed downmix, when the activation indication is not set to the activation state, based on the parametric side information on the one or more audio object signals to obtain the audio output signal. Furthermore, an encoder is provided.

    摘要翻译: 提供一种解码器,用于从包括多个时域下混样本的下混信号产生包括一个或多个音频输出通道的音频输出信号。 降混信号编码两个或更多个音频对象信号。 解码器包括用于确定多个分析窗口的窗口序列发生器(134),其中每个分析窗口包括下混合信号的多个时域下混样本。 多个分析窗口的每个分析窗口具有指示所述分析窗口的时域下混样本数的窗口长度。 窗口序列生成器(134)被配置为确定多个分析窗口,使得每个分析窗口的窗口长度取决于两个或更多个音频对象信号中的至少一个的信号属性。 此外,解码器包括在/ f分析模块(135),用于根据窗口长度将多个分析窗口中的每个分析窗口的多个时域下混样本从时域变换到时间 - 频域 的分析窗口,以获得一个转换的下混。 此外,解码器包括用于基于关于两个或更多个音频对象信号的参数侧信息解混合变换的下混合以获得音频输出信号的解混合单元(136)。 此外,提供了一种编码器。