Method for reducing noise in speech signal and method for detect

Details Method for reducing noise in speech signal and method for detect Method for reducing noise in speech signal and method for detect

1996-11-07

1999-10-26

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

704240, 704214, G10L 506

Patent

active

059743735

ABSTRACT:
A method for reducing noise in an input speech signal by adaptively controlling a maximum likelihood filter that is provided to calculate speech components based on a probability of speech occurrence and on a calculated signal-to-noise ratio based on the input speech signal. The characteristics of the maximum likelihood filter are smoothed along both the frequency axis and along the time axis. In the case of the frequency axis, smoothing filtering is based upon a median value of characteristics of the filter in the frequency range under consideration and on the characteristics of the filter in neighboring left and right frequency ranges, and in the case of smoothing filtering along the time axis, smoothing is done both for signals of a speech part and of a noise part.

REFERENCES:
patent: 4630305 (1986-12-01), Borth et al.
J. Yang, "Frequency Domain Noise Suppression Approaches in Mobile Telephone Systems"; Inst. of Electronics Engineers, vol. 2, Apr. 27, 1993, pp. II-363-366.

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