Bit-Erasure Channel Decoding For Gmm-Based Multiple Description Coding

Multiple Description Coding (MDC) is a plausible way to use the diversity of packet networks to increase the robustness of the transmission to packet losses. The redundancy that is introduced via MDC can also be used to increase the robustness of the transmission to bit-errors. This paper presents a novel decoding method for GMM (Gaussian Mixture Model)-based MDC in the presence of detected bit-errors. Particularly for speech transmission over bit-erasure channels, is is shown that the proposed method considerably improves the quality of the received speech spectral envelopes when one side-description is damaged. In highly correlated descriptions, for example, single and double bit-errors can almost be corrected.