Design And Implementation Of Video Conference System Based On Software Coding

Newly issued by the International Telecommunications Union (JTU), G.723.I is a standard of low bit-rate speech coder, applicable to multimedia communications. System model and algorithms of coding and decoding of G.723.1 are analyzed in this paper. Based on this analysis, an implementation method based on software coding is presented. In the design, the encoder module and the decoder module are respectively implemented by dynamic-link library (DLL) for convenience. Microsoft DirectSound technology is also used to capture and play the speech signal. Together with the video part (including video capture,codec and playback), this system can be used in any video conference system. In this paper, the system is designed for Remote Learning System Based on BISDN.