A New CS-ACELP Algorithm Based on G.729
Fei Gao · Audio Engineering · 2004
On the base of G.729, a non-exhaustive codebook search method is used. And a Psycho-acoustic perceptual weighting filter is substituted for traditional perceptual weighting filter. The two methods decrease computing complexity of 8Kb/s CS-ACELP speech codec while do not reduce the synthetic speech quality. Though the non-exhaustive codebook search method debases search veracity, it scales down data processing quantity of searching. The Psycho-acoustic perceptual weighting filter is based on human acoustic structure. It takes the ears' different sensitivity to different frequency into account. So the new filter brings to the system better subjective speech effect. Simulation result shows that the new algorithm can reduce the complexity and acquire satisfied synthetic speech quality.