实现基频提取的RAPT算法（一种鲁棒性的基频提取算法）。输入文件为wav波形文件。-A Robust Algorithm for Pitch Tracking (RAPT)

使用Matlab进行wav文件的基音频率提取，包括自相关法、平均幅度差法和倒谱法等。-Wav files in Matlab to extract the pitch frequency, including the auto-correlation method, average magnitude difference method and the cepstrum method.