Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1985-08-26
1990-01-30
Clark, David L.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 47, G10L 708
Patent
active
048978787
ABSTRACT:
A method and apparatus for noise suppression for speech recognition systems which employs the principle of a least means square estimation which is implemented with conditional expected values. Essentially, according to this method, one computes a series of optimal estimators which estimators and their variances are then employed to implement a noise immune metric. This noise immune metric enables the system to substitute a noisy distance with an expected value which value is calculated according to combined speech and noise data which occurs in the bandpass filter domain. Thus the system can be used with any set of speech parameters and is relatively independent of a specific speech recognition apparatus structure.
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Boll, Suppression of Acoustic Noise in Speech Using Spectral Subtraction, IEEE Trans. on ASSP, vol. ASSP-27, No. 3, Apr. 1979, pp. 113-120.
Tierney, A Study of LPC Analysis of Speech in Additive Noise, IEEE Trans. on ASSP, vol. ASSP-28, No. 4, Aug. 1980, pp. 389-397.
F. Itakura, Minimum Protection Residual Principle Applied Speech Recognition, IEEE Trans. on ASSP, vol. ASSP-23, pp. 67-72, Feb. 1975.
Porter and Boll, "Optimal Estimators for Spectral Restoration of Noisy Speech", ICASSP, San Diego, CA, Mar. 1984, pp. 18A.2.1-18A.2.4.
Boll Steven F.
Porter Jack E.
Clark David L.
ITT Corporation
Knepper David D.
Twomey Thomas N.
Werner Mary C.
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