Abstract: In order to apply the low bit-rate speech coding algorithm to the real speech processing system, a real-time speech compression system based on TMS320VC5410 fixed-point DSP at low bit-rate is introduced in this paper. A high-quality 4kb/s dispersed-pulse CELP algorithm is adopted in this system. The functions of data collection, processing and playback are implemented by fixed-point DSP programs in assembly language. About 31K memory spaces are consumed by this system and the complexity of this algorithm is about 54.2 million instruments per second. Objective test indicated there is no perceptual difference for the reconstructed speech quality compared with the original C programming result. So this speech processing system can be applied to real-time speech compression.