Prediction in speech coding: the modification of the coding of LPC parameters and nonlinear estimation technique by using ANN

Linear and non-linear prediction techniques of speech signal and the different performance of LPC algorithms are discussed. A new coding plan has been suggested to raise the quantification SNR by about 2 dB by coding the difference of the log-area ratio (LAR) of adjacent frames instead of the LAR. Then, the stable time delay ANN is used to carry out NLP (non-linear prediction) tasks. Experiment results show that only one NLP system is enough to deprive all short-term and long-term correlation from the speech samples and the energy from the output of the NLP system is much smaller than that obtained with the LP system