Speech recognition method and system with improved voice-activat

Details Speech recognition method and system with improved voice-activat Speech recognition method and system with improved voice-activat

1995-04-07

1998-01-13

Tsang, Fan

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379 67, 395 237, H04M 908

Patent

active

057087040

ABSTRACT:
The present invention provides a system for a voice prompt talkover capability. The system and method include a speech recognizer (36), an echo canceler (24), a delay finder (27) and a utterance extraction mechanism (30). The delay finder (27) determines the propagation delay between outgoing signal and the incoming signal and stores the signal in a delay buffer (23) in accordance with the delay and the filter length of the echo canceler. The echo canceler (24), using the incoming signals, the delay buffer and the delay enhance the incoming signal by removing the echo. The utterance extractor (30) determines the start of an utterance based on energy in the vectors of the LPC buffer (28). Upon the detection of an utterance the utterance extractor (30) initiates the start of recognition and terminates operation of the echo canceler (24) and the prompt play out (14). A recognition result is returned from the speech recognition processor (36) to the application (12).

REFERENCES:
patent: 4914692 (1990-04-01), Hartwell et al.
patent: 5155760 (1992-10-01), Johnson et al.
patent: 5400394 (1995-03-01), Raman et al.
patent: 5425098 (1995-06-01), Kamiya
Messerschmitt, D., Hedberg, D., Cole, C., Haoui, A., and Winship, P., "Digital Voice Echo Canceller with a TMS32020", Digital Signal Processing Applications With The TMS320 Family, pp. 417-436, Texas Instruments, Inc., 1986.
Picone, Johnson, and Hartwell, Enhancing the Performance of Speech Recognition With Echo Cancellation, ICASSP 88 vol. 1 Speech Processing 1988, pp. 529-532.

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