Fast code-vector searching
    13.
    发明授权
    Fast code-vector searching 有权
    快速码矢量搜索

    公开(公告)号:US06766289B2

    公开(公告)日:2004-07-20

    申请号:US09874657

    申请日:2001-06-04

    IPC分类号: G10L1910

    CPC分类号: G10L19/10 G10L2019/0013

    摘要: Methods and apparatus for quickly selecting an optimal excitation waveform from a codebook are presented herein. In encoding schemes that use forward and backward pitch enhancement, storage and processor load is reduced by approximating a two-dimensional autocorrelation matrix with a one-dimensional autocorrelation vector. The approximation is possible when a cross-correlation element is configured to determine the autocorrelation matrix of an impulse response and a pulse energy determination element is configured to determine the energy of a pulse code vector that incorporates secondary pulse positions.

    摘要翻译: 本文给出了从码本快速选择最佳激励波形的方法和装置。 在使用前向和后向间距增强的编码方案中,通过用一维自相关向量逼近二维自相关矩阵来减少存储和处理器负载。 当互相关元件被配置为确定脉冲响应的自相关矩阵并且脉冲能量确定元件被配置为确定包含次级脉冲位置的脉冲码矢量的能量时,近似是可能的。

    Method and apparatus for accurate endpointing of speech in the presence of noise
    15.
    发明授权
    Method and apparatus for accurate endpointing of speech in the presence of noise 有权
    用于在存在噪声的情况下准确地终止语音的方法和装置

    公开(公告)号:US06324509B1

    公开(公告)日:2001-11-27

    申请号:US09246414

    申请日:1999-02-08

    IPC分类号: G10L1504

    CPC分类号: G10L25/87 G10L2025/786

    摘要: An apparatus for accurate endpointing of speech in the presence of noise includes a processor and a software module. The processor executes the instructions of the software module to compare an utterance with a first signal-to-noise-ratio (SNR) threshold value to determine a first starting point and a first ending point of the utterance. The processor then compares with a second SNR threshold value a part of the utterance that predates the first starting point to determine a second starting point of the utterance. The processor also then compares with the second SNR threshold value a part of the utterance that postdates the first ending point to determine a second ending point of the utterance. The first and second SNR threshold values are recalculated periodically to reflect changing SNR conditions. The first SNR threshold value advantageously exceeds the second SNR threshold value.

    摘要翻译: 用于在存在噪声的情况下准确地终止语音的装置包括处理器和软件模块。 处理器执行软件模块的指令,以将话语与第一信噪比(SNR)阈值进行比较,以确定话音的第一起始点和第一个终点。 然后,处理器与第二SNR阈值比较发声的一部分,该部分在第一起始点之前确定发音的第二起始点。 然后,处理器还与第二SNR阈值比较后续第一个终点的话语的一部分,以确定话语的第二个终点。 周期性地重新计算第一和第二SNR阈值以反映改变的SNR条件。 第一SNR阈值有利地超过第二SNR阈值。

    Characterizing a communication system using frame aligned test signals
    16.
    发明授权
    Characterizing a communication system using frame aligned test signals 失效
    使用帧对齐的测试信号来表征通信系统

    公开(公告)号:US06169763A

    公开(公告)日:2001-01-02

    申请号:US08808624

    申请日:1997-02-28

    IPC分类号: H04B1700

    摘要: A method and apparatus for aligning a test signal to a frame interval of a communication system in which an alignment test signal having an alternating pattern of frequencies is generated and transmitted over a communication link that carries the alignment test signal in a sequence of frames. The alignment test signal is received over the communication link as a return alignment test signal and then evaluated for frequency content. The start time of the alignment test signal is adjusted until the frequency content of the return alignment test signal corresponds to the alternating pattern of frequencies.

    摘要翻译: 一种用于将测试信号与通信系统的帧间隔对准的方法和装置,其中生成具有交替频率模式的对准测试信号并通过以帧序列携带对准测试信号的通信链路发送测试信号。 通过通信链路接收对准测试信号作为返回对准测试信号,然后对频率内容进行评估。 调整对准测试信号的开始时间直到返回对准测试信号的频率内容对应于频率的交替模式。

    Method for searching an excitation codebook in a code excited linear
prediction (CELP) coder
    17.
    发明授权
    Method for searching an excitation codebook in a code excited linear prediction (CELP) coder 失效
    用于在代码激励线性预测(CELP)编码器中搜索激励码本的方法

    公开(公告)号:US5751901A

    公开(公告)日:1998-05-12

    申请号:US690709

    申请日:1996-07-31

    CPC分类号: G10L19/12 G10L25/06

    摘要: A method for selecting a code vector in an algebraic codebook wherein the analysis window for the coder is extended beyond the length of the target speech frame. By extending the analysis window, the two dimensional impulse response matrix can be stored as a one dimensional autocorrelation matrix greatly saving on the computational complexity and memory required for the search.

    摘要翻译: 一种用于选择代数码本中的码矢量的方法,其中用于编码器的分析窗口被扩展到目标语音帧的长度之外。 通过扩展分析窗口,可以将二维脉冲响应矩阵作为一维自相关矩阵存储,大大节省了搜索所需的计算复杂度和存储空间。

    Reducing memory requirements of a codebook vector search
    20.
    发明授权
    Reducing memory requirements of a codebook vector search 有权
    减少码本向量搜索的内存要求

    公开(公告)号:US06789059B2

    公开(公告)日:2004-09-07

    申请号:US09876352

    申请日:2001-06-06

    IPC分类号: G10L1910

    CPC分类号: G10L19/10 G10L2019/0013

    摘要: Methods and apparatus for quickly selecting an optimal excitation waveform from a codebook are presented herein. To reduce the number of computations required to choose the optimal codebook vector, a subset of codevectors are selected based upon optimal pulse locations, wherein the subset of codevectors form a subcodebook. Rather than searching the entire codebook, only the entries of the subcodebook are searched.

    摘要翻译: 本文给出了从码本快速选择最佳激励波形的方法和装置。 为了减少选择最佳码本向量所需的计算次数,基于最佳脉冲位置选择码矢量的子集,其中码矢量子集形成子码本。 而不是搜索整个码本,只搜索子码本的条目。