Second European Conference on Speech Communication and Technology

Genova, Italy
September 24-26, 1991


Toward Vocabulary-Independent Recognition of Telephone Speech

I. Lee Hetherington, Hong C. Leung, Victor W. Zue

Spoken Language Systems Group, Laboratory for Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA

This paper describes a set of experiments using a speaker-independent, isolated-word recognition system over the telephone network. We are concerned with the sensitivity of recognition accuracy to a set of external factors. Specifically, we want to know how much performance degradation can be expected when no vocabulary-specific data are available for training. We also want to determine the relative importance of several factors in choosing a vocabulary-independent training set including: data collection paradigm, speaking mode, and recording environment. Our results indicate that recognition accuracy decreases appreciably in the absence of vocabulary-specific training data. If vocabulary-specific training data are not available, reasonable initial recognition performance can be achieved by using a phonetically balanced corpus for training, preferably consisting of isolated words recorded over the telephone network.

Full Paper

Bibliographic reference.  Hetherington, I. Lee / Leung, Hong C. / Zue, Victor W. (1991): "Toward vocabulary-independent recognition of telephone speech", In EUROSPEECH-1991, 475-478.