SPEECH CODING METHOD AND DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a method and device for speech coding a sampled speech signal using logn term prediction (LTP). SOLUTION: A LTP pitch-lag parameter is determined for each frame of the speech signal by first determining the autocorrelation function for the frame within the signal, between predefined maximum and minimum delays. The autocorrelation function is then weighted to emphasise the function for delays in the neighbourhood of the pitch-lag parameter determined for the most recent voiced frame. The maximum value for the weighted autocorrelation function is then found and identified as the pitch-lag parameter for the frame. COPYRIGHT: (C)2010,JPO&INPIT