A new prosody-assisted mandarin ASR system

Sin-Horng Chen*, Jyh Her Yang, Chen Yu Chiang, Ming Chieh Liu, Yih-Ru Wang

*Corresponding author for this work

Research output: Contribution to journalArticle

14 Scopus citations


This paper presents a new prosody-assisted automatic speech recognition (ASR) system for Mandarin speech. It differs from the conventional approach of using simple prosodic cues on employing a sophisticated prosody modeling approach based on a four-layer prosody-hierarchy structure to automatically generate 12 prosodic models from a large unlabeled speech database by the joint prosody labeling and modeling (PLM) algorithm proposed previously. By incorporating these 12 prosodic models into a two-stage ASR system to rescore the word lattice generated in the first stage by the conventional hidden Markov model (HMM) recognizer, we can obtain a better recognized word string. Besides, some other information can also be decoded, including part of speech (POS), punctuation mark (PM), and two types of prosodic tags which can be used to construct the prosody-hierarchy structure of the testing speech. Experimental results on the TCC300 database, which consists of long paragraphic utterances, showed that the proposed system significantly outperformed the baseline scheme using an HMM recognizer with a factored language model which models word, POS, and PM. Performances of 20.7%, 14.4%, and 9.6% in word, character, and base-syllable error rates were obtained. They corresponded to 3.7%, 3.7%, and 2.4% absolute (or 15.2%, 20.4%, and 20% relative) error reductions. By an error analysis, we found that many word segmentation errors and tone recognition errors were corrected.

Original languageEnglish
Article number6148262
Pages (from-to)1669-1684
Number of pages16
JournalIEEE Transactions on Audio, Speech and Language Processing
Issue number6
StatePublished - 19 Apr 2012


  • Prosody modeling
  • prosody-assisted automatic speech recognition (ASR)
  • prosody-hierarchy structure

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