9th Annual Conference of the International Speech Communication Association

Brisbane, Australia
September 22-26, 2008

Acoustic-Phonetic Approach for Automatic Evaluation of Spoken Grammar

Om D. Deshmukh, Ashish Verma

IBM India Research Lab, India

Evaluating spoken grammar skills is an important component of evaluating the overall spoken English skills of a candidate. This paper presents a novel approach that incorporates the knowledge of acoustic-phonetics to improve the performance of an existing spoken grammar evaluation technique in a question-answer paradigm. A novel acoustic parameter, Onset Coherence, to make a one-pass distinction between the onsets of fricatives, stops and vowels is also proposed. The performance of the proposed approach is evaluated against human labeled data obtained from real-life spoken grammar assessment tests. The proposed approach of combining the knowledge from the acoustic-phonetic domain with the information obtained from the automatic speech recognition system leads to an improvement of 8.2% in utterance-level classification.

Full Paper

Bibliographic reference.  Deshmukh, Om D. / Verma, Ashish (2008): "Acoustic-phonetic approach for automatic evaluation of spoken grammar", In INTERSPEECH-2008, 2614-2617.