Title :
Real-time implementation and evaluation of variable rate CELP coders
Author :
Hernández-Gómez, L.A. ; Casajús-Quirós, F.J. ; García-Mateo, C. ; Ortega-García, J.
Author_Institution :
ETSI Telecommun., Madrid, Spain
Abstract :
The authors describe the main topics related to a real-time implementation of the Proposed Federal Standard 1016 (PFS-1016) 4800 bps CELP (code excited linear prediction) voice coder together with some alternatives to extend real-time CELP schemes over a wide range of bit rates (8000, 6500, and 2400 bps are considered). Several procedures are evaluated in order to select the options in PFS-1016 that provide the highest quality for an implementation based on a single AT&T DSP32C chip. From the basic CELP scheme, higher and lower bit rates are derived after evaluation of the efficiency obtained for the different elements in this speech coding algorithm
Keywords :
digital signal processing chips; encoding; filtering and prediction theory; real-time systems; standards; vocoders; 2400 bit/s; 4800 bit/s; 6500 bit/s; 8000 bit/s; AT&T DSP32C chip; CELP; PFS-1016; Proposed Federal Standard 1016; code excited linear prediction; efficiency; speech coding algorithm; variable rate CELP coders; voice coder; Bit rate; Code standards; Europe; GSM; Land mobile radio; Linear predictive coding; Speech coding; Standards development; Telecommunication standards; Telephony;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1991. ICASSP-91., 1991 International Conference on
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-0003-3
DOI :
10.1109/ICASSP.1991.150407
