EUROSPEECH 2001 Scandinavia
7th European Conference on Speech Communication and Technology

Aalborg, Denmark
September 3-7, 2001


Comparing Grammar-Based and Robust Approaches to Speech Understanding: A Case Study

Sylvia Knight (1), Genevieve Gorrell (2), Manny Rayner (2), David Milward (1), Rob Koeling (1), Ian Lewin (2)

(1) SRI International, UK; (2) Netdecisions, UK

Previous work has demonstrated the success of statistical language models when enough training data is available, but despite that, grammar-based systems are proving the preferred choice in successful commercial systems such as HeyAnita, BeVocal and Tellme, largely due to the difficulty involved in obtaining a corpus of training data. Here we trained an SLM on data obtained using a grammar-based system and compared the performance of the two systems with regards to recognition. We also parsed the output of the SLM using a robust parser and compared the accuracy of the semantic output of the systems. The SLM/robust parser showed considerable improvement on unconstrained input, and similar precision/recall (per slot value) on utterances provided by trained users.

Full Paper

Bibliographic reference.  Knight, Sylvia / Gorrell, Genevieve / Rayner, Manny / Milward, David / Koeling, Rob / Lewin, Ian (2001): "Comparing grammar-based and robust approaches to speech understanding: a case study", In EUROSPEECH-2001, 1779-1782.