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dc.titleEstimation of unreliable packets in subband coding of speech
dc.contributor.authorWong, W.C.
dc.contributor.authorSeshadri, N.
dc.contributor.authorSundberg, C.-E.W.
dc.identifier.citationWong, W.C.,Seshadri, N.,Sundberg, C.-E.W. (1991-02). Estimation of unreliable packets in subband coding of speech. IEE Proceedings, Part I: Communications, Speech and Vision 138 (1) : 43-49. ScholarBank@NUS Repository.
dc.description.abstractA robust speech communications system over a digital mobile radio channel is considered. We 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. Unreliable subband side information about the energy profile is identified through a two-stage process comprising the channel error detector and a source-based subband energy profile error detector. 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 of a digital mobile radio communication system, 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.
dc.contributor.departmentELECTRICAL ENGINEERING
dc.description.sourcetitleIEE Proceedings, Part I: Communications, Speech and Vision
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