A Quick Method of System Function and Theoretical Model Test of a Three-order Narrow Band Digital Filter

On the basis of simulative filters design, a three-order experimental digital filter is realized which has a centre frequency of 50Hz, the largest attenuation of 3dB in 4dB-width band-pass, the lest attenuation of 20dB in the stop-band which is less than 45Hz and more than 55Hz. Simulation results of the design are presented. The synthetic results suggest that the design method is effective and can satisfy the demand for high sampling rate.