A WIDEBAND CELP CODER AT 16 kbit/s FOR REAL TIME APPLICATIONS

Since its introduction in 1984, Code Excited Linear Predictive (CELP) [1] coding has received considerable attention for high quality speech coding at low bit-rates. Although most of the research has been focused on coding of narrowband (200-3400 kHz) speech, some recent studies on CELP coding of wideband (50-7000 kHz) speech have been reported [2], [3], [4]. A possible application for wideband speech coders is the loudspeaking videophone, where it is foreseen that for the next generation videophones, a 64 kbit/s channel can be used for both speech and video. Here, we present results on a 16 kbit/s, 7 kHz CELP coder which will allow wideband speech within a 64 kbit/s videophone service.