一种基于瞬时频率的多普勒畸变声信号校正方法

运动声源信号中广泛存在多普勒效应影响，针对其引起的频移、频带扩展问题提出了一种校正方法。信号的频率非平稳性的还原通常使用重采样方法，而建立一组重采样时间序列就是该方法的核心。对于多普勒畸变信号，瞬时频率与原信号频率有着密切的关系。仿真信号和实验信号处理结果显示，多普勒效应带来的频带扩展问题得到了较好的解决，畸变信号得到了有效校正。

A Correction Method for Doppler - distortion Signal from Acoustic Moving Source Based on the Instantaneous Frequency

Doppler effect widely exists in the signal from the moving acoustic source, to solve the brought in problems such as frequency shift and frequency band expansion, a correction method is presented in this paper. Resampling method is often used to restore the non - stationary signal frequency and to establish a set of resampling time sequence is the core of the method. For Doppler -distortion signal, the instantaneous frequency has close relationship with the original signal frequency. The processing results of the simulation signal and roiling bearing experimental signal show that frequency band expansion is well solved and signal distortion is effectively corrected.