International Symposium on Chinese Spoken Language Processing (ISCSLP 2002)

Taipei, Taiwan
August 23-24, 2002

Confidence Measures for Large Vocabulary Continuous Speech Recognition

Ping Lv, Zuo-Ying Wang, Da-Jin Lu

Department of Electronic Engineering, Tsinghua University, Beijing, China

Estimation confidence of the output hypothesis of a speech recognizer can be used in many practical applications of speech recognition technology. In this paper, we propose to estimate the confidence of a hypothesized word directly as its posterior probability. There are tow methods to calculate posterior probabilities, one of which is based on word graphs and the other is based on N-best lists. We present experiment results on database provided by China National 863. And we also use confidence measures in unsupervised speaker adaptation.

Full Paper

Bibliographic reference.  Lv, Ping / Wang, Zuo-Ying / Lu, Da-Jin (2002): "Confidence measures for large vocabulary continuous speech recognition", In ISCSLP 2002, paper 87.