Abstract:
This paper focuses on the recognition of noisy speech. We show that the decoding of a noisy speech waveform can be facilitated if the recognizer has explicit knowledge of...Show MoreMetadata
Abstract:
This paper focuses on the recognition of noisy speech. We show that the decoding of a noisy speech waveform can be facilitated if the recognizer has explicit knowledge of where it should hypothesize speech phones, and where it should map the acoustics to non-speech phones. We build a speech/non-speech detector and use its output as an additional front-end feature. We show that by appropriately weighting the contribution of this feature in the decoder and by modifying the acoustic models accordingly, we can penalize speech/non-speech confusions and consequently reduce the recognition error rate. This approach gives a 12% overall error rate reduction on a wide variety of recognition tasks and noise characteristics without degrading performance on clean test data. A simple extension of the approach boosts recognition improvements on noisy test sets to 14% overall.
Published in: 2003 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03).
Date of Conference: 06-10 April 2003
Date Added to IEEE Xplore: 21 May 2003
Print ISBN:0-7803-7663-3
Print ISSN: 1520-6149