Noise-robust speech processing
    2.
    发明公开
    Noise-robust speech processing 失效
    噪声不敏感的语言处理

    公开(公告)号:EP0781833A3

    公开(公告)日:1998-09-23

    申请号:EP96308906

    申请日:1996-12-09

    Applicant: IBM

    CPC classification number: G10L15/02 G10L15/20

    Abstract: 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 (50) 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 (52) and a spatial derivative (54), respectively, of the first output to produce a second output. Next, all the negative values of the second output are replaced (56) with zeros. A feature vector is then obtained (58) 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.

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