A Study on 8kbps PC-MPC by Using Position Compensation Method of Multi-Pulse
Seewoo Lee · Journal of Digital Convergence · 2013
Abstract In a MPC coding using excitation source of voiced and unvoiced, it would be a distortion of speech waveform. This is caused by normalization of synthesis speech waveform of voiced in the process of restoration the multi-pulses of representation section. To solve this problem, this paper present a method of position compensation(PC-MPC) in a multi-pulses each pitch interval in order to reduce distortion of speech waveform. I was confirmed that the method can be synthesized close to the original speech waveform. And I evaluate the MPC and PC-MPC using multi-pulses position compensation method. As a result, SNR seg of PC-MPC was improved 0.4dB for female voice and 0.5dB for male voice respectively. Compared to the MPC, SNR seg of PC-MPC has been improved that I was able to control the distortion of the speech waveform finally. And so, I expect to be able to this method for cellular phone and smart phone using excitation source of low bit rate. Key Words : Cellular Phone, Smart Phone, Internet Phone, Speech Coding, Coding System