发明申请
- 专利标题: VITERBI DECODER AND SPEECH RECOGNITION METHOD USING SAME
- 专利标题(中): VITERBI解码器和语音识别方法
-
申请号: US12506719申请日: 2009-07-21
-
公开(公告)号: US20100161329A1公开(公告)日: 2010-06-24
- 发明人: Hoon CHUNG , Jeon Gue PARK , Yunkeun LEE , Ho-Young JUNG , Hyung-Bae JEON , Jeorn Ja KANG , Sung Joo LEE , Euisok CHUNG , Ji Hyun WANG , Byung Ok KANG , Ki-young PARK , Jong Jin KIM
- 申请人: Hoon CHUNG , Jeon Gue PARK , Yunkeun LEE , Ho-Young JUNG , Hyung-Bae JEON , Jeorn Ja KANG , Sung Joo LEE , Euisok CHUNG , Ji Hyun WANG , Byung Ok KANG , Ki-young PARK , Jong Jin KIM
- 申请人地址: KR Daejeon
- 专利权人: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
- 当前专利权人: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
- 当前专利权人地址: KR Daejeon
- 优先权: KR10-2008-0131365 20081222
- 主分类号: G10L15/00
- IPC分类号: G10L15/00
摘要:
A Viterbi decoder includes: an observation vector sequence generator for generating an observation vector sequence by converting an input speech to a sequence of observation vectors; a local optimal state calculator for obtaining a partial state sequence having a maximum similarity up to a current observation vector as an optimal state; an observation probability calculator for obtaining, as a current observation probability, a probability for observing the current observation vector in the optimal state; a buffer for storing therein a specific number of previous observation probabilities; a non-linear filter for calculating a filtered probability by using the previous observation probabilities stored in the buffer and the current observation probability; and a maximum likelihood calculator for calculating a partial maximum likelihood by using the filtered probability. The filtered probability may be a maximum value, a mean value or a median value of the previous observation probabilities and the current observation probability.