Abstract: A new algorithm of pitch extraction is proposed.In this algorithm，LPC analysis of segmented speech by Burg algorithm is performed to construct inverse filter with the best predictor coefficient.Then cepstrum analysis is proceeded by replacing the former speech sequence with the LPC prediction error sequence，and the maximum peak is tested in an appropriate scope to detect the speech pitch.The experimental results indicate that the proposed pitch extraction method is feasible and more robustly than the conventional method.Using the improved algorithm，a high accuracy can be obtained at low signal-to-noise ratio.