Title :
CELP coding for land mobile radio applications
Author :
Rahikka, Douglas J. ; Tremain, Thomas E. ; Welch, Vanoy C. ; Campbell, Joseph P., Jr.
Author_Institution :
Dept. of Defense, Fort Meade, MD, USA
Abstract :
The performance of the Proposed Federal Standard 1024 8000-b/s system for digital land mobile radio on a 12.5- or 6.25-kHz channel is described. The system contains the Proposed Federal Standard 1016 4800-b/s code excited linear predictive (CELP) voice coder developed by the US DOD and AT&T Bell Laboratories. The system is error protected with 2400 b/s and has 800 b/s for overhead signaling. The system is intended to replace the 12 kHz continuous variable slope deltamod (CVSD) voice coder which is used in Federal Standard 1025. The error protection technique used is Golay coding with hard or soft decoding. The performance of this error protection over simulated fading radio channels is described
Keywords :
digital radio systems; encoding; filtering and prediction theory; mobile radio systems; speech analysis and processing; vocoders; 12.5 kHz; 6.25 kHz; 8 kbit/s; CELP voice coder; Golay coding; Proposed Federal Standard 1016; Proposed Federal Standard 1024 8000-b/s system; code excited linear predictive voice coder; digital land mobile radio; error protection; simulated fading radio channels; Adaptive coding; Books; Code standards; Decoding; Fading; Forward error correction; Land mobile radio; Protection; Speech coding; Speech synthesis; Standards development; Stochastic processes; US Department of Defense;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1990. ICASSP-90., 1990 International Conference on
Conference_Location :
Albuquerque, NM
DOI :
10.1109/ICASSP.1990.115750
