In the current satellite television receivers, the video processing circuit receives satellite television signals of different systems on the same video lower pass filter and De-emphasis network, which leads to amplitude frequency distortion and signal-to-noise deterioration of the signals.

With the stochastic and projection theory, a new shape feature named shape-fluctuation matching and video filtering system shows that the algorithms are more accurate and with less processing time.

This paper discusses some filtering algorithms for false matches on the basis of 2D space and 3D space,and puts forward a grey pre-processing algorithm applying beforehand to lower the false matching rate and a disparity filtering algorithm based on ground truth control points.

Study of bandwidth for suppressing seawater backscattering based on frequency filtering;

Finally,frequency filtering technique is adopted and combined with the regression equation to reveal the effect of the designated fre- quency range on in-car noise preference.

Based on continuous wavelet transform, through scale decomposition and frequency filtering, the main component of echo signal is extracted by energy analysis, the disturbed component is eliminated.