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    • 42. 发明授权
    • Apparatus, method and computer program product for feature extraction
    • 用于特征提取的装置,方法和计算机程序产品
    • US08073686B2
    • 2011-12-06
    • US12366037
    • 2009-02-05
    • Yusuke KidaTakashi Masuko
    • Yusuke KidaTakashi Masuko
    • G10L11/04G10L19/00
    • G10L15/02G10L25/06G10L25/90
    • A feature extraction apparatus includes a spectrum calculating unit that calculates, based on an input speech signal, a frequency spectrum having frequency components obtained at regular intervals on a logarithmic frequency scale for each of frames that are defined by regular time intervals, and thereby generates a time series of the frequency spectrum; a cross-correlation coefficients calculating unit that calculates, for each target frame of the frames, a cross-correlation coefficients between frequency spectra calculated for two different frames that are in vicinity of the target frame and a predetermined frame width apart from each other; and a shift amount predicting unit that predicts a shift amount of the frequency spectra on the logarithmic frequency scale with respect to the predetermined frame width by use of the cross-correlation coefficients.
    • 特征提取装置包括频谱计算单元,该频谱计算单元基于输入的语音信号,以规则的时间间隔以规律的间隔对每个由规则的时间间隔定义的帧进行频率分量的频谱,从而生成 时间序列的频谱; 互相关系数计算单元,对于帧的每个目标帧,计算针对在目标帧附近的两个不同帧计算的频谱与彼此分开的预定帧宽度的互相关系数; 以及偏移量预测单元,其通过使用互相关系数来预测相对于预定帧宽度的对数频谱上的频谱的偏移量。
    • 46. 发明授权
    • Apparatus and method for speech recognition using probability and mixed distributions
    • 使用概率和混合分布进行语音识别的装置和方法
    • US07921012B2
    • 2011-04-05
    • US11857104
    • 2007-09-18
    • Hiroshi FujimuraTakashi Masuko
    • Hiroshi FujimuraTakashi Masuko
    • G10L15/28
    • G10L15/32
    • A speech recognition apparatus includes a first storing unit configured to store a first acoustic model invariable regardless of speaker and environment, a second storing unit configured to store a classification model that has shared parameters and non-shared parameters with the first acoustic model to classify second acoustic models, a recognizing unit configured to calculate a first likelihood with regard to the input speech by applying the first acoustic model to the input speech and obtain calculation result on the shared parameter and a plurality of candidate words that have relatively large values as the first likelihood, and a calculating unit configured to calculate a second likelihood for each of the groups with regard to the input speech by use of the calculation result on the shared parameters and the non-shared parameters of the classification model.
    • 语音识别装置包括:第一存储单元,被配置为存储不管扬声器和环境如何不变的第一声学模型;第二存储单元,被配置为存储具有共享参数和非共享参数的分类模型与第一声学模型,以对第二声学模型进行分类 声学模型,识别单元,被配置为通过将第一声学模型应用于输入语音来计算关于输入语音的第一可能性,并且获得关于共享参数的计算结果和具有相对较大值的多个候选词作为第一 以及计算单元,被配置为通过使用关于共享参数的计算结果和分类模型的非共享参数来计算关于输入语音的每个组的第二似然。