关键词: 语音信号, 基音周期, 线性预测编码, 平均幅度差函数, 自相关函数

Abstract: According to the mechanism of speech signal, a super resolution pitch detection algorithm, which combined Linear Predictive Coding (LPC) with Average Magnitude Difference Function (AMDF), was proposed. Firstly, residual of LPC was extracted by linear predictive analysis. Then, cumulative mean normalized difference function and difference signal revision were used to make pitch valley sharper. At last, parabolic interpolation and pitch multiple check were taken to select real pitch period. The experimental results indicate that the pitch detection effect of the algorithm is superior to that of the conventional algorithms. The proposed algorithm conquers half frequency errors, and has good accuracy and robustness under the condition of high Signal-to-Noise Ratio (SNR).

Key words: speech signal, pitch period, Linear Predictive Coding (LPC), Average Magnitude Difference Function (AMDF), Auto Correlation Function (ACF)