A 4.75 kb/s ACELP Speech Coding Algorithm

In this paper,a 4.75 kb/s speech coding algorithm based on ACELP is introduced.This coding algorithm adopts a special codebook structure and a codebook searching technique with high efficiency and low computational complexity.A general description of this coding algorithim is introduced at first,the open loop pitch analysis,adaptive codebook search,and algebraic codebook structure and searching technique are given with emphasis on the algebraic codebook structure and algebraic codebook searching technique.This algorithm is simulated with fixed point C language,and the simulation result shows that this kind of speech coding algorithm at 4.75 kb/s can synthesize high quality speech.