Noise eliminating apparatus and speech recognition apparatus usi

Details Noise eliminating apparatus and speech recognition apparatus usi Noise eliminating apparatus and speech recognition apparatus usi

1992-04-24

1993-05-18

Knepper, David D.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

381 46, 381 94, G10L 500, G10L 708

Patent

active

052127648

ABSTRACT:
A noise eliminating apparatus includes a first feature extracting block for individually extracting a feature quantity X(f) (f =1, 2, . . . , n) of an input speech containing a noise for n channels (n is an integer), and a second feature extracting block for individually extracting a feature quantity N(f) of the noise for the n channels. The apparatus also includes a noise eliminating block for deriving a first noise eliminating variable k(f) and a second noise eliminating variable d(f) from the feature quantity X(f) of the input speech containing the noise provided for each of the n channels and the feature quantity N(f) of the noise provided for each of the n channels and for generating a feature quantity S(f) of a noise-eliminated input speech in accordance with the following formula:

REFERENCES:
patent: 4239936 (1980-12-01), Sakoe
patent: 4625083 (1986-11-01), Poikela
patent: 4672674 (1987-06-01), Clough et al.
patent: 4829578 (1989-05-01), Roberts
patent: 4932063 (1990-06-01), Nakamura
S. F. Boll, "Suppression of Acoustic Noise in Speech Using Spectral Subtraction," IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-27, No. 2, Apr., 1979, pp. 113-120.
B. Widrow et al., "Adaptive Noise Cancelling: Principles and Applications," Proceedings of the IEE, vol. 63, No. 12, Dec., 1975, pp. 1692-1716.

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