An efficient complexity reduction scheme for G.723.1 speech coder

Because of the limited computational capability of personal electronic devices in multimedia communication, a coder with low computational complexity is necessary for integrating services from several media sources. This paper presents a scheme that uses a third-order adaptive pitch predictor to reduce the computational complexity of the G.723.1 speech coder. The simulation results indicate that the average perceptual evaluation of speech quality score is degraded slightly, by 0.08, and our proposed method can reduce computational complexity by about 36.9% compared with the original G.723.1 encoder computation load, and with perceptually negligible degradation. Objective evaluations verify that our proposed complexity reduction scheme can provide speech quality equivalent to that of the original coder.