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

fYear

1994

fDate

19-22 Apr 1994

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1994. ICASSP-94., 1994 IEEE International Conference on

Conference_Location

Adelaide, SA

ISSN

1520-6149

Print_ISBN

0-7803-1775-0

Type

conf

DOI

10.1109/ICASSP.1994.389703

Filename

389703