Speech recognition apparatus

Details Speech recognition apparatus Speech recognition apparatus

1994-12-22

1997-08-05

MacDonald, Allen R.

395 235, 395 261, G10L 900

Patent

active

056550570

ABSTRACT:
A speech recognition apparatus includes an average vector calculating portion 5, a compensating portion 6, and a matching portion 8. The average vector calculating portion 5 calculates an average vector for each of the noise region and the speech region of the input speech and those of a reference pattern received from a spectrum converting portion 4 corresponding to matching information received from a preliminary matching portion 2. The compensating portion 6 compensates the average vectors calculated by the average vector calculating portion 5 for at least one of the time sequence of the spectra of the input speech and the time sequence of the spectra of the reference pattern so that the average vector of the time sequence of the spectra of the noise region of the input speech matches with the average vector of the time sequence of the spectra of the noise region of the reference pattern, and that the average vector of the time sequence of the spectra of the speech region of the input speech matches with the average vector of the time sequence of the spectra of the speech region of the reference pattern. The matching portion 8 finally matches the reference pattern with the input speech and outputs a recognition result.

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Crozier et al. ("Speech enhancement employing subtraction and linear predictive analysis", Electronics' Letters, vol.29, Issue 12, pp. 1094-1095, Jun. 10 1993).
Vaseghi et al. ("Noisy Speech Recognition using Cepstral-Time Features and Spectral-Time Filters", ICASSP'94: Acoustics, Speech & Signal Conference, vol. II, pp. 65-68, 1994).

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