RESEARCH ON DIALECT-SPECIFIC LEXICON ADAPTATION

• 来源期刊: 信息通信技术
• 学科: 工学
• 关键词: ICDW SDP SER
• 年，卷（期）: 2008,（2）
• 所属期刊栏目: 技术广角
• 页码范围: 55-60
• 页数: 6页
• 分类号: TN92
• 语种: 中文

摘要

With respect m dialectal-accented speech recognition, dialect-specific lexicon adaptation is an indispensable component to improve the performance. In this paper, a phone-based confusion matrix is adopted to obtain dialect-specific pronunciation variants. A weighting method, improved context-dependent weighting (ICDW) is proposed to characterize the pronunciation probability precisely by taking both the surface form left-context-dependency and the base form left-context-dependency into account. To make a much robust lexicon, a pruning criterion, syllable-dependent pruning (SDP), is also proposed which achieves the most effective result. In summary, the dialect-specific dialect adaptation reduces a 2.9% absolute and a 3.6% absolute in syllable error rate (SER) respectively on read speech and spontaneous speech from Shanghai-accented speakers.