Title :
A codec for speech recognition in a wireless system
Author :
Reichl, W. Olfgang ; Eerackody, Vijitha W. ; Potamianos, Alexandros
Author_Institution :
Lucent Technol. Bell Labs., Murray Hill, NJ, USA
Abstract :
We consider a distributed speech recognition system where representative parameters of the speech signal are extracted at the wireless terminal and transmitted to a centralized automatic speech recognition (ASR) server. Several error protection schemes are proposed for the ASR feature stream. In addition, a “soft-feature” error concealment strategy is introduced at the ASR server that uses the marginal distribution of only the reliable features during likelihood computation. The performance of the error protection and concealment schemes is evaluated over typical cellular wireless channels and it is shown to reduce ASR error rate up to 65% for certain channels
Keywords :
Gaussian channels; Rayleigh channels; cellular radio; error detection; forward error correction; quantisation (signal); radio networks; speech codecs; speech recognition; ASR feature stream; ASR server; Gaussian channels; automatic speech recognition server; cellular wireless channels; correlated Rayleigh channels; distributed speech recognition system; error protection schemes; error rate reduction; forward error correction; forward error detection; likelihood computation; marginal distribution; performance; soft-feature error concealment; speech codec; speech quantization; speech signal parameters; unequal error protection; wireless system; wireless terminal; Automatic speech recognition; Cepstral analysis; Degradation; Network servers; Protection; Quantization; Robustness; Speech analysis; Speech codecs; Speech recognition;
Conference_Titel :
EUROCOMM 2000. Information Systems for Enhanced Public Safety and Security. IEEE/AFCEA
Conference_Location :
Munich
Print_ISBN :
0-7803-6323-X
DOI :
10.1109/EURCOM.2000.874767
