Title :
Unequal error protection and source-channel decoding of CELP speech
Author :
Nazer, A. ; Alajaji, E.
Author_Institution :
Dept. of Math. & Stat., Queen´´s Univ., Kingston, Ont., Canada
fDate :
3/28/2002 12:00:00 AM
Abstract :
The reliable communication of FS CELP 1016 encoded speech over very noisy channels is investigated. Using second-order Markov chains it is shown that over one-quarter of the CELP bits in every frame of speech are redundant. An unequal error protection coding scheme, which exploits this residual redundancy, is proposed for sending the CELP parameters over Gaussian and Rayleigh fading channels. Simulations indicate substantial coding gains over conventional systems
Keywords :
Gaussian channels; Markov processes; Rayleigh channels; combined source-channel coding; decoding; error correction codes; linear predictive coding; redundancy; speech coding; telecommunication network reliability; voice communication; CELP speech; FS CELP 1016 encoded speech; Gaussian channels; Rayleigh fading channels; coding gains; reliable communication; residual redundancy; second-order Markov chains; source-channel decoding; unequal error protection coding; very noisy channels;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20020242
