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    Improving sound quality of established low bit-rate audio coding systems without loss of decoder compatility
    3.
    发明公开
    Improving sound quality of established low bit-rate audio coding systems without loss of decoder compatility 有权
    提高利用低比特率创造了音频编码系统的音质，而不Decodierkompabilität损失

    公开(公告)号：EP2228790A3

    公开(公告)日：2010-12-01

    申请号：EP10164889.7

    申请日：2000-06-19

    申请人： DTS, Inc.

    发明人： You, Yu-Li ,  Smith, William Paul ,  Fejzo, Zoran ,  Smyth, Stephen

    IPC分类号： G10L21/04

    CPC分类号： H04B14/046 ,  G10L19/008 ,  G10L21/038 ,  G11B20/10527 ,  G11B20/1217 ,  G11B27/3027

    摘要： A multi-channel audio compression technology is presented that extends the range of sampling frequencies compared to existing technologies and/or lowers the noise floor while remaining compatible with those earlier generation technologies. The high-sampling frequency multi-channel audio (12) is decomposed into core audio up to the existing sampling frequencies and a difference signal up to the sampling frequencies of the next generation technologies. The core audio is encoded (18) using the first generation technology such as DTS, DOLBY AC-3 or MPEG I or MPEG II such that the encoded core bit stream (20) is fully compatible with a comparable decoder in the market. The difference signal (34) is encoded (36) using technologies that extend the sampling frequency and/or improve the quality of the core audio. The compressed difference signal (38) is attached as an extension to the core bit stream (20). The extension data will be ignored by the first generation decoders but can be decoded by the second generation decoders. By summing the decoded core and extension audio signals together (28), a second generation decoder can effectively extend the audio signal bandwidth and/or improve the signal to noise ratio beyond that available through the core decoder alone.

    Digital sound signal transmitting apparatus and receiving apparatus
    9.
    发明公开
    Digital sound signal transmitting apparatus and receiving apparatus 审中-公开
    一种用于发送和装置，用于接收数字音频信号

    公开(公告)号：EP0933889A1

    公开(公告)日：1999-08-04

    申请号：EP99101205.5

    申请日：1999-01-22

    申请人： Olympus Optical Co., Ltd.

    发明人： Imade, Shinichi c/o Olympus Optical Co., Ltd.

    IPC分类号： H04B14/04

    CPC分类号： H04B14/046

    摘要： A transmitting apparatus (1) has a band adaptive type input data converting section (12) and a compression encoding section (13). The band adaptive type input data converting section (12) includes a frequency band setting section for setting a frequency band for a to-be-transmitted digital sound signal, and determining a cut-off frequency and a re-sampling frequency for the digital sound signal on the basis of the set frequency band, an adaptive anti-aliasing filter for adaptively filtering the to-be-transmitted digital sound signal on the basis of the cut-off frequency, and a re-sampling section for re-sampling the digital sound signal having passed through the adaptive anti-aliasing filter, using the re-sampling frequency. The compression encoding section (13) performs compression encoding on the re-sampled digital sound signal in units of a predetermined number of data samples, thereby creating encoded data.

    摘要翻译： 发送装置（1）具有一个带自适应类型的输入数据转换部分（12）和一个压缩编码部分（13）。 带自适应类型的输入数据转换部分（12）包括用于设置并列一个待发送的数字声音信号的频率为数字声音的频带设定部，和确定性采矿截止频率和再采样频率 所述一组频带的基础上信号，到自适应抗混叠滤波器的截止频率的基础上自适应地滤波所述待发送的数字声音信号，以及用于再采样所述数字再采样部 声音信号已经通过自适应抗混叠过滤器，使用重新采样频率。 压缩编码部（13）对数据样本的预定数目为单位的重新采样的数字声音信号进行压缩编码，从而产生编码数据。