Variable-rate enhanced double-band excitation LPC low bit rate speech coding algorithm

Based on the analysis of speech signals, using sub-band division technology and the idea of transmitting residual signals in CELP(Code Excited Linear Predi ctive) coding algorithm, a variable-rate enhanced double-band excitation LPC(Linear Predictive Coding) low bit rate speech coding algorithm is presente d. In order t o improve the robustness and quality of the synthesis speech, some new methods an d ameliorations are employed in pitch detection, vector quantization, and speech synthesis. Simulation results indicate that this algorithm ensures good quality of synthesis speech with low bits.