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    Noise cancellation system and method
    5.
    发明授权
    Noise cancellation system and method 有权
    噪声消除系统和方法

    公开(公告)号：US08296135B2

    公开(公告)日：2012-10-23

    申请号：US12270218

    申请日：2008-11-13

    申请人： Byung Ok Kang ,  Ho-Young Jung ,  Sung Joo Lee ,  Yunkeun Lee ,  Jeon Gue Park ,  Jeom Ja Kang ,  Hoon Chung ,  Euisok Chung ,  Ji Hyun Wang ,  Hyung-Bae Jeon

    发明人： Byung Ok Kang ,  Ho-Young Jung ,  Sung Joo Lee ,  Yunkeun Lee ,  Jeon Gue Park ,  Jeom Ja Kang ,  Hoon Chung ,  Euisok Chung ,  Ji Hyun Wang ,  Hyung-Bae Jeon

    IPC分类号： G10L21/02

    CPC分类号： G10L15/20 ,  G10L21/0208

    摘要： A noise cancellation apparatus includes a noise estimation module for receiving a noise-containing input speech, and estimating a noise therefrom to output the estimated noise; a first Wiener filter module for receiving the input speech, and applying a first Wiener filter thereto to output a first estimation of clean speech; a database for storing data of a Gaussian mixture model for modeling clean speech; and an MMSE estimation module for receiving the first estimation of clean speech and the data of the Gaussian mixture model to output a second estimation of clean speech. The apparatus further includes a final clean speech estimation module for receiving the second estimation of clean speech from the MMSE estimation module and the estimated noise from the noise estimation module, and obtaining a final Wiener filter gain therefrom to output a final estimation of clean speech by applying the final Wiener filter gain.

    摘要翻译： 噪声消除装置包括：噪声估计模块，用于接收含噪声的输入语音，并估计噪声以输出所估计的噪声; 用于接收所述输入语音的第一维纳滤波器模块，以及对其施加第一维纳滤波器以输出清洁语音的第一估计; 用于存储用于建模清洁语音的高斯混合模型的数据的数据库; 以及MMSE估计模块，用于接收清洁语音的第一估计和高斯混合模型的数据，以输出干净语音的第二估计。 该装置还包括最后的清洁语音估计模块，用于从MMSE估计模块接收清洁语音的第二估计和来自噪声估计模块的估计噪声，并从中获得最终的维纳滤波器增益，以便通过以下方式输出清洁语音的最终估计： 应用最后的维纳滤波器增益。

    Viterbi decoder and speech recognition method using same using non-linear filter for observation probabilities
    7.
    发明授权
    Viterbi decoder and speech recognition method using same using non-linear filter for observation probabilities 有权
    维特比解码器和语音识别方法使用非线性滤波器进行观察概率

    公开(公告)号：US08332222B2

    公开(公告)日：2012-12-11

    申请号：US12506719

    申请日：2009-07-21

    申请人： Hoon Chung ,  Jeon Gue Park ,  Yunkeun Lee ,  Ho-Young Jung ,  Hyung-Bae Jeon ,  Jeom Ja Kang ,  Sung Joo Lee ,  Euisok Chung ,  Ji Hyun Wang ,  Byung Ok Kang ,  Ki-young Park ,  Jong Jin Kim

    发明人： Hoon Chung ,  Jeon Gue Park ,  Yunkeun Lee ,  Ho-Young Jung ,  Hyung-Bae Jeon ,  Jeom Ja Kang ,  Sung Joo Lee ,  Euisok Chung ,  Ji Hyun Wang ,  Byung Ok Kang ,  Ki-young Park ,  Jong Jin Kim

    IPC分类号： G10L15/00

    CPC分类号： G10L15/08 ,  G10L15/142

    摘要： A Viterbi decoder includes: an observation vector sequence generator for generating an observation vector sequence by converting an input speech to a sequence of observation vectors; a local optimal state calculator for obtaining a partial state sequence having a maximum similarity up to a current observation vector as an optimal state; an observation probability calculator for obtaining, as a current observation probability, a probability for observing the current observation vector in the optimal state; a buffer for storing therein a specific number of previous observation probabilities; a non-linear filter for calculating a filtered probability by using the previous observation probabilities stored in the buffer and the current observation probability; and a maximum likelihood calculator for calculating a partial maximum likelihood by using the filtered probability. The filtered probability may be a maximum value, a mean value or a median value of the previous observation probabilities and the current observation probability.

    摘要翻译： 维特比解码器包括：观测向量序列生成器，用于通过将输入语音转换为观察向量序列来生成观察向量序列; 局部最优状态计算器，用于获得具有与当前观察向量最大相似度的部分状态序列作为最佳状态; 观测概率计算器，用于获得在最佳状态下观察当前观测矢量的概率作为当前观测概率; 用于在其中存储特定数量的先前观察概率的缓冲器; 用于通过使用存储在缓冲器中的先前观察概率和当前观察概率来计算滤波概率的非线性滤波器; 以及最大似然计算器，用于通过使用滤波的概率来计算部分最大似然。 滤波概率可以是先前观测概率和当前观测概率的最大值，平均值或中值。