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Estimation of unreliable packets in subband coding of speech (digital mobile radio)

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3 Author(s)
Wong, W.C. ; Dept. of Electr. Eng., Nat. Univ. of Singapore, Singapore ; Seshadri, N. ; Sundberg, C.-E.W.

A robust speech communications system over a digital mobile radio channel is considered. The authors examine a system using 12 kbit/s embedded subband coding of speech and rate compatible punctured convolutional (RCPC) codes with generalised Viterbi decoding for combined error detection and correction. System performance is improved by exploiting the frame-to-frame redundancy in the subband energy profile used for adaptive bit allocation in the subband coder. The subband side information deemed unreliable is replaced with the estimates based on frame-to-frame redundancy. This improved error detection capability in the subband side information allows a judicious reassignment of channel error protection bits to the subband main information, leading to an overall improvement in system performance. Using a realistic simulation model, an improvement of up to 4.4 dB in recovered speech segmental SNR is obtained at a channel SNR of 6 dB, compared with a system with only channel error protection.<>

Published in:

Communications, Speech and Vision, IEE Proceedings I  (Volume:138 ,  Issue: 1 )