Title :
A real-time wideband CELP coder for a videophone application
Author :
Harborg, E. ; Knudsen, J.E. ; Fuldseth, A. ; Johansen, F.T.
Author_Institution :
SINTEF, Trondheim, Norway
Abstract :
In this paper we present an algorithm for the coding of wideband (7 kHz) speech signals at 16 kbps using code excited linear prediction (CELP), primarily intended for use in audio-visual coding systems (e.g., videotelephony) in the ISDN network, or other telecommunication equipment using loudspeaker sound. The algorithm is a full-band approach and much effort has been put into reducing the computational complexity. This has led to a real-time implementation of the present algorithm on a single TMS320C31 DSP (encoder+decoder). Through a formal subjective evaluation we have demonstrated a performance comparable to the CCITT Rec. G.722 subband coder at 64 kbps
Keywords :
computational complexity; digital signal processing chips; linear predictive coding; speech codecs; speech coding; videotelephony; vocoders; 16 kbit/s; 64 kbit/s; 7 kHz; CCITT Rec. G.722 subband coder; ISDN network; algorithm; audio-visual coding systems; code excited linear prediction; coding; computational complexity; decoder; encoder; full-band approach; performance; real-time implementation; real-time wideband CELP coder; single TMS320C31 DSP; speech signals; telecommunication equipment; videophone application; Computational complexity; Digital signal processing; Filters; Linear predictive coding; Signal synthesis; Speech analysis; Speech coding; Speech synthesis; Testing; Wideband;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1994. ICASSP-94., 1994 IEEE International Conference on
Conference_Location :
Adelaide, SA
Print_ISBN :
0-7803-1775-0
DOI :
10.1109/ICASSP.1994.389703
