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    • 9. 发明授权
    • Method and system for noise-robust speech processing with cochlea
filters in an auditory model
    • 在听觉模型中使用耳蜗滤波器进行噪声鲁棒语音处理的方法和系统
    • US5768474A
    • 1998-06-16
    • US581288
    • 1995-12-29
    • Chalapathy V. Neti
    • Chalapathy V. Neti
    • G10L15/02G10L15/20G01L5/06G01L9/00
    • G10L15/02G10L15/20
    • A method for noise-robust speech processing with cochlea filters within a computer system is disclosed. This invention provides a method for producing feature vectors from a segment of speech, that is more robust to variations in the environment due to additive noise. A first output is produced by convolving a speech signal input with spatially dependent impulse responses that resemble cochlea filters. The temporal transient and the spatial transient of the first output is then enhanced by taking a time derivative and a spatial derivative, respectively, of the first output to produce a second output. Next, all the negative values of the second output are replaced with zeros. A feature vector is then obtained from each frame of the second output by a multiple resolution extraction. The parameters for the cochlea filters are finally optimized by minimizing the difference between a feature vector generated from a relatively noise-free speech signal input and a feature vector generated from a noisy speech signal input.
    • 公开了一种在计算机系统内使用耳蜗滤波器进行噪声鲁棒语音处理的方法。 本发明提供了一种用于从语音段产生特征向量的方法,其对于由于加性噪声引起的环境变化更加鲁棒。 通过将语音信号输入与类似于耳蜗滤波器的空间相关脉冲响应进行卷积来产生第一输出。 然后通过分别获得第一输出的时间导数和空间导数来增强第一输出的时间瞬态和空间瞬态以产生第二输出。 接下来,第二个输出的所有负值都被替换为零。 然后通过多分辨率提取从第二输出的每个帧获得特征向量。 通过最小化从相对无噪声语音信号输入产生的特征向量与从噪声语音信号输入产生的特征向量之间的差异,最终优化耳蜗滤波器的参数。