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    Fixed-size cross-correlation computation method for audio time scale modification
    2.
    发明授权
    Fixed-size cross-correlation computation method for audio time scale modification 有权
    用于音频时间尺度修正的固定尺寸互相关计算方法

    公开(公告)号：US07580761B2

    公开(公告)日：2009-08-25

    申请号：US10714175

    申请日：2003-11-14

    申请人： Atsuhiro Sakurai ,  Yoshihide Iwata

    发明人： Atsuhiro Sakurai ,  Yoshihide Iwata

    IPC分类号： G06F17/00

    CPC分类号： G10L21/04 ,  G10L2013/021

    摘要： A time-domain time-scale modification method based on the synchronous overlap-and-add method consists of a generalization of the envelope-matching time-scale modification method. The cross-correlation function employs a fixed-size cross-correlation buffer to eliminate the need for normalization inside the search loop. This fixed-size cross-correlation buffer is the center of the overlap region corresponding to the case where the fine overlap adjustment value is set to zero. The computational cost of this invention is lower than any other method with a comparable quality.

    摘要翻译： 基于同步重叠法的时域时间尺度修正方法由包络匹配时间尺度修正方法的一般化构成。 互相关函数采用固定大小的互相关缓冲器，以消除对搜索循环内的归一化的需要。 该固定大小的互相关缓冲器是与精细重叠调整值设定为零的情况相对应的重叠区域的中心。 本发明的计算成本低于具有相当质量的任何其它方法。

    Generalized envelope matching technique for fast time-scale modification
    5.
    发明授权
    Generalized envelope matching technique for fast time-scale modification 有权
    广义包络匹配技术，用于快速时间尺度修改

    公开(公告)号：US07328076B2

    公开(公告)日：2008-02-05

    申请号：US10714218

    申请日：2003-11-14

    申请人： Atsuhiro Sakurai ,  Yoshihide Iwata

    发明人： Atsuhiro Sakurai ,  Yoshihide Iwata

    IPC分类号： G06F17/00

    CPC分类号： G10L21/04 ,  G10L2013/021

    摘要： A time-domain time-scale modification method based on the synchronous overlap-and-add method consists of a generalization of the envelope-matching time-scale modification method. The cross-correlation function employs n most significant bits rather than merely the sign bit of the prior envelope matching method. This provides higher accuracy for n>1. A fixed-size cross-correlation buffer is employed to eliminate the need for normalization inside the search loop. This invention makes full use of fast/parallel shift and multiply-and-accumulate (MAC) instructions of current digital signal processors to become at the same time faster and more precise than envelope-matching time-domain time-scale modification.

    摘要翻译： 基于同步重叠法的时域时间尺度修正方法由包络匹配时间尺度修正方法的一般化构成。 互相关函数使用n个最高有效位，而不仅仅是先前的包络匹配方法的符号位。 这为n> 1提供了更高的精度。 使用固定大小的互相关缓冲器来消除搜索循环内的归一化的需要。 本发明充分利用当前数字信号处理器的快速/并行移位和乘法和累加（MAC）指令，同时比包络匹配时域时间尺度修改更快更精确。

    Time-scale modification stereo audio signals
    6.
    发明申请
    Time-scale modification stereo audio signals 审中-公开
    时间尺寸修改立体声音频信号

    公开(公告)号：US20050137729A1

    公开(公告)日：2005-06-23

    申请号：US10739677

    申请日：2003-12-18

    申请人： Atsuhiro Sakurai ,  Yoshihide Iwata

    发明人： Atsuhiro Sakurai ,  Yoshihide Iwata

    IPC分类号： G06F17/00 ,  G10L19/00 ,  G10L21/04 ,  H04R5/00

    CPC分类号： G10L21/04 ,  G10L19/008

    摘要： An efficient time scale modification (TSM) scheme for stereo signals is proposed where the overlap point is calculated just once per stereo frame based on a downmixed signal. The proposed scheme results in significantly lower computational cost compared with conventional methods: about 1.2 to 1.3 times the amount of computation required by monoaural signals, against 2.0 times the amount of computation required by channel-independent methods. Listening tests indicate that the quality achieved is higher than conventional channel-independent approaches due to the preservation of the spatial localization of the sound.

    摘要翻译： 提出了一种用于立体声信号的有效的时间尺度修正（TSM）方案，其中基于下混合信号，每立体声帧仅计算一次重叠点。 与常规方法相比，所提出的方案导致显着降低的计算成本：单声道信号所需的计算量的约1.2倍至1.3倍，是通道无关方法所需的计算量的2.0倍。 听力测试表明，由于保存了声音的空间定位，所获得的质量要高于常规频道独立的方法。

    Seamless audio speed change based on time scale modification
    8.
    发明申请
    Seamless audio speed change based on time scale modification 有权
    基于时间尺度修改的无缝音频速度变化

    公开(公告)号：US20070078662A1

    公开(公告)日：2007-04-05

    申请号：US11244360

    申请日：2005-10-05

    申请人： Atsuhiro Sakurai ,  Yoshihide Iwata

    发明人： Atsuhiro Sakurai ,  Yoshihide Iwata

    IPC分类号： G10L21/04

    CPC分类号： G10L21/04 ,  G11B27/005 ,  G11B2020/10722

    摘要： This invention involves time-scale modification of audio signals. The invention describes overlap and add time scale modification with variable input and output buffer sizes. Seamless speed change is achieved by keeping track of previously processed data to avoid discontinuities during playback speed transitions.

    摘要翻译： 本发明涉及音频信号的时间尺度修改。 本发明描述了具有可变输入和输出缓冲器大小的重叠和添加时间尺度修改。 通过跟踪先前处理的数据来避免无缝的速度变化，以避免在播放速度转换期间的不连续性。

    Fixed-size cross-correlation computation method for audio time scale modification
    9.
    发明申请
    Fixed-size cross-correlation computation method for audio time scale modification 有权
    用于音频时间尺度修正的固定尺寸互相关计算方法

    公开(公告)号：US20050038534A1

    公开(公告)日：2005-02-17

    申请号：US10714175

    申请日：2003-11-14

    申请人： Atsuhiro Sakurai ,  Yoshihide Iwata

    发明人： Atsuhiro Sakurai ,  Yoshihide Iwata

    IPC分类号： G06F17/00 ,  G10L21/00 ,  G10L21/04

    CPC分类号： G10L21/04 ,  G10L2013/021

    摘要： A time-domain time-scale modification method based on the synchronous overlap-and-add method consists of a generalization of the envelope-matching time-scale modification method. The cross-correlation function employs a fixed-size cross-correlation buffer to eliminate the need for normalization inside the search loop. This fixed-size cross-correlation buffer is the center of the overlap region corresponding to the case where the fine overlap adjustment value is set to zero. The computational cost of this invention is lower than any other method with a comparable quality.

    摘要翻译： 基于同步重叠法的时域时间尺度修正方法由包络匹配时间尺度修正方法的一般化构成。 互相关函数采用固定大小的互相关缓冲器，以消除对搜索循环内的归一化的需要。 该固定大小的互相关缓冲器是与精细重叠调整值设定为零的情况相对应的重叠区域的中心。 本发明的计算成本低于具有相当质量的任何其它方法。