Research of MELP low bit rate digital speech coding
Wei Guo-teng · Electronic Design Engineering · 2010
In order to satisfy demands of the digital communication and other commercial applications,the speech compression technology has been developed rapidly.There are several main LBRSC prevailing in recent years,such as line prediction coding(LPC-10),mixed excitation line prediction(MELP),multi-band excitation(MBE),sinusoidal transform cording(STC),and waveform interpolation(WI),most of which works at the rate of 2.4kb/s.MELP algorithm is based on the basis of Line Prediction(LP).Five characters has been introduced into MELP algorithm,they are mixed excitation,a periodic pulse,Fourier magnitudes pulse dispersion and adaptive spectral filtering.The experimental results show that the mixed excitation linear predictive coding in the 2.4 kb/s gives a better synthesized speech,and makes the synthesized speech to better fit the natural voice.