Data processing: speech signal processing – linguistics – language – Speech signal processing
Patent
1997-10-30
1999-12-28
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
455418, G10L 300
Patent
active
060093838
ABSTRACT:
A voice service node (VSN) serving a wireless speech terminal (WST) connected to a mobile switching center (MSC) comprises a bypass unit, a speech codec and a speech recognizer. The bypass unit exchanges messages with a remote bypass unit at the MSC, and switches the operation of the VSN between a PCM mode, for analog speech terminals, and a codec bypass mode, for digital speech terminals. The speech codec operates during the bypass mode to decode a speech frame into a sequence of digital words for the speech recognizer and to encode a voice prompt signal form a speech prompting system from a sequence of digital words into a speech frame. The speech recognizer receives the sequence of digital words and a flag indicating the status of the frame and provides a set of parameters characterizing the sequence of digital words. The set of parameters and the flag are applied to a distance computation unit for determining a set of distances between a speech model and the set of parameters. A searching unit receives the set of distances and locates a plurality of choices in a lexicon. A top choice is determined, or all choices are rejected if none of them is above a recognition threshold.
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Diaconescu Aprilia U.
Hudspeth David R.
Nortel Networks Corporation
Opsasnick Michael N.
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