time frequency filtering

Fractional Fourier transform and time-frequency filtering

分数阶Fourier变换与时频滤波

And thus the fine time-frequency resolution can be obtained. The RPK time-frequency distribution not only suppresses the cross-terms preferably but also removes the noise of signals due to the adaptive filtering of the kernel function.

自适应抛物线核时频分析方法由于核函数对信号自项的选通作用，不仅较好地抑制了交叉项，同时对噪声起到了很好的抑制效果。

Although the filtering method in frequency domain can solve the time variant filtering problem based on Fourier transform, the method may appear a false anomaly in conjunct part between windows.

频率域滤波方法虽然可解决时变滤波问题，但这种方法是基于傅里叶变换，在窗口与窗口之间的接合部位会出现假异常。

Reduction of random noise for seismic data by time-frequency peak filtering

用时频峰值滤波方法消减地震勘探资料中随机噪声的初步研究

With the use of filtering method in frequency domain, certain low frequency components were filtered, the time domain waveform was retrieved by IFFT, and the biphase T wave appeared in time domain.

用频域滤波的方法，分别滤去一定低频成分，再IFFT恢复时域波形，时域信号出现了双相T波。

Low level image processing is the base of navigation. The paper discusses time domain filtering and frequency domain filtering according to the noise disturbance in the surroundings images.

低层视觉图像处理是视觉导航的基础，针对环境图像存在噪声干扰的特点，文章分别从时域和频域上分析了图像滤波的方法。