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Titolo:
FLEXIBLE SPEECH UNDERSTANDING BASED ON COMBINED KEY-PHRASE DETECTION AND VERIFICATION
Autore:
KAWAHARA T; LEE CH; JUANG BH;
Indirizzi:
KYOTO UNIV,SCH INFORMAT KYOTO 6068501 JAPAN
Titolo Testata:
IEEE transactions on speech and audio processing
fascicolo: 6, volume: 6, anno: 1998,
pagine: 558 - 568
SICI:
1063-6676(1998)6:6<558:FSUBOC>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
RECOGNITION;
Keywords:
DIALOGUE SYSTEMS; KEY-PHRASE DETECTION; SPEECH RECOGNITION; SPEECH UNDERSTANDING; UTTERANCE VERIFICATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
T. Kawahara et al., "FLEXIBLE SPEECH UNDERSTANDING BASED ON COMBINED KEY-PHRASE DETECTION AND VERIFICATION", IEEE transactions on speech and audio processing, 6(6), 1998, pp. 558-568

Abstract

We propose a novel speech understanding strategy based on combined detection and verification of semantically tagged key-phrases in spontaneous spoken utterances. Key-phrases are defined in a top-down manner so as to constitute semantic slots. Their detection directly leads to robust understanding. A phrase network realizes both a wide coverage and a reasonable constraint for detection. A subword-based verifier is then incorporated to reduce false alarms in detection and attach confidence measures of the detected phrases. This set of phrase confidence measures, when incorporated in a spoken dialogue system, forms a basis for designing intelligent speech interfaces that accept only verified key-phrases and reprompt users to clarify unspecified or unrecognized portions. Several forms of confidence measures based on subword-level tests are investigated. The proposed approach was tested on field datacollected from real-world trial applications. The combined detection and verification strategy drastically improves the accuracy in handling out-of-grammar utterances over the conventional decoding approaches while maintaining the performance for in-grammar utterances.

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Documento generato il 27/09/20 alle ore 00:32:17