如果观察比较纯净的语音，可以看到韵母部分的波形呈现出一定的周期特性，这个周期被称为基音周期(pitch/f0)。通常部分声母和静音部分观察不到周期性，也就是没有基音周期。基音周期反映了发音时声门开合的频率特点。

对语音进行短时自相关处理，估计基音周期，考察各种平滑方法对自相关结果的影响。

-If you look at a more pure voice, vowel part of the waveform can be seen showing the cyclical nature of this cycle known as the pitch (pitch/f0). Usually part of the initial consonant and mute some observers are less cyclical, is the pitch period. The pitch period reflects the pronunciation glottal opening and closing of the frequency characteristics. Voice short-term self-treatment, the estimated pitch period, and examine the impact of a variety of smoothing methods for self-relevant results.