Speech recognition system in a variable noise environment

Details Speech recognition system in a variable noise environment Speech recognition system in a variable noise environment

1985-08-21

1986-06-24

Kemeny, E. S. Matt

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

G10L 100

Patent

active

045970980

ABSTRACT:
A speech recognition system for an automotive vehicle derive a spoken instruction start signal and a spoken instruction end signal when a smoothed spoken instruction signal exceeds or drops below a predetermined threshold level representing the intensity of the background noise for more than first and second predetermined time periods, respectively. Noise is determined by converting the output of a microphone transducing the spoken instruction into a single polarity signal that is smoothed with a long time constant. The single polarity variation is also smoothed with a shorter time constant. The signals with the long and short constants are applied to a comparator that derives a bi-level output signal. In response to transitions in first and second directions of the bi-level signal lasting for first and second durations, the start and end signals are respectively derived.

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D. Raj Reddy, "Speech Recognition by Machine: A Review", Proceedings of the IEEE, vol. 64, No. 4, Apr. 1976.
S. L. Dunik, "Phoneme Recognizer Using Formant Ratios", IBM Technical Disclosure Bulletin, vol. 22, No. 11, Apr. 1980.

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