Method and system for noise-robust speech processing with cochle

Details Method and system for noise-robust speech processing with cochle Method and system for noise-robust speech processing with cochle

1995-12-29

1998-06-16

MacDonald, Allen R.

395 241, 395 242, 395 211, 395 252, G01L 506, G01L 900

Patent

active

057684740

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 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.

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