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

fYear

1991

fDate

14-17 Apr 1991

Firstpage

585

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1991. ICASSP-91., 1991 International Conference on

Conference_Location

Toronto, Ont.

ISSN

1520-6149

Print_ISBN

0-7803-0003-3

Type

conf

DOI

10.1109/ICASSP.1991.150407

Filename

150407