Subsyllable-based discriminative segmental Bayesian network for Mandarin speech keyword spotting

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2 Citations (Scopus)


A continuous Mandarin speech keyword spotting system based on context-dependent subsyllables is presented. In this vocabulary-independent system, users can define their own keywords and most frequently occurring non-keywords without retraining the system. A set of 176 monosyllables and 483 balanced words or sentences are used to extract the context-dependent subsyllables (i.e. initials or finals in Mandarin speech), for training. Each subsyllable is represented by a proposed discriminative segmental Bayesian network (DSBN). In the training process, the generalised probabilistic descent (GPD) algorithm is used for discriminative training. The most frequently ^occurring non-keywords are divided into keyword predecessors and successors. Non-keyword garbage models for keyword predecessors, keyword successors and extraneous speech are separately constructed. In the recognition process, a final part preprocessor is used to screen out unreasonable hypotheses in order to reduce the recognition time. Using a test set of 750 - conversational speech utterances from 20 speakers (ten males and ten females), word spotting rates of 92.0% when the vocabulary word was embedded in unconstrained extraneous speech, were obtained for a user-defined 20 keyword vocabulary.

Original languageEnglish
Pages (from-to)65-71
Number of pages7
JournalIEE Proceedings: Vision, Image and Signal Processing
Issue number2
Publication statusPublished - 1997

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Electrical and Electronic Engineering


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