This paper use the Bispectrum estimation using the direct method to process the tremor, based on studying the theory about bispectrum.It can detect quadratic phase coupling in tremor signal.

• 在对双谱分析理论充分研究的基础上，应用直接法双谱估计分析不同类型的震颤信号，检测不同震颤二次相位耦合情况。