EUROSPEECH 2001 Scandinavia
7th European Conference on Speech Communication and Technology
2nd INTERSPEECH Event

Aalborg, Denmark
September 3-7, 2001

                 

MMSE-Based Channel Error Mitigation for Distributed Speech Recognition

Antonio M. Peinado, Victoria Sanchez, Josť C. Segura, Josť L. Perez-Cordoba

Universidad de Granada, Spain

Recently, the first version of an ETSI standard for Distributed Speech Recognition has been proposed. The main benefit of this approach is the possibility of maintaining a high recognition performance when accessing remote information systems. The use of a digital channel for transmission of the encoded speech parameters implies the introduction of several channel distortions. Our paper deals with the mitigation of such distortions. We study the application of MMSE estimation to this problem and propose a new MMSE procedure that obtains the probabilities needed for MMSE from a forward-backward algorithm. We show that MMSE estimation obtains better performance than the mitigation algorithm described in the ETSI standard under different channel conditions.

Full Paper

Bibliographic reference.  Peinado, Antonio M. / Sanchez, Victoria / Segura, Josť C. / Perez-Cordoba, Josť L. (2001): "MMSE-based channel error mitigation for distributed speech recognition", In EUROSPEECH-2001, 2707-2710.