In this paper

a kind of real-time speech coder with high quality and low complexity at the bit rate of 8kb/s is presented. The encoding algorithm is based on algebraic code excited linear prediction （ACELP）. Efficient codebook structure and codebook search strategies

along with efficient vector quantization procedures

have been developed to achieve high quality reconstructed speech while maintaining low complexity. Without any external RAM or ROM

the algorithm has been implemented on TMS320C50 for a realtime full duplex communication system.Through performance tests of SNR and subjective listening

we have verified that the proposed algorithm is better than the 8kb/s VSELP algorithm and its complexity is almost the same as that of VSELP algorithm.