A comparison of front-ends for bitstream-based ASR over IP
Signal Processing
Robust speech recognition over mobile and IP networks in burst-like packet loss
IEEE Transactions on Audio, Speech, and Language Processing
Recognizing voice over IP: a robust front-end for speechrecognition on the world wide web
IEEE Transactions on Multimedia
IEEE Transactions on Multimedia
Web-based remote voice control of robotized cells
Robotics and Computer-Integrated Manufacturing
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This paper examines the performance of a Distributed Speech Recognition (DSR) system in the presence of both background noise and packet loss. Recognition performance is examined for feature vectors extracted from speech using a physiologically-based auditory model, as an alternative to the more commonly-used Mel Frequency Cepstral Coefficient (MFCC) front-end. The feature vectors produced by the auditory model are vector quantised and combined in pairs for transmission over a statistically modelled channel that is subject to packet burst loss. In order to improve recognition performance in the presence of noise, the speech is enhanced prior to feature extraction using Wiener filtering. Packet loss mitigation to compensate for missing features is also used to further improve performance. Speech recognition results show the benefit of combining speech enhancement and packet loss mitigation to compensate for channel and environmental degradations.