青云翻译

When the analog filter's frequency response attenuation at frequencies above the fold greater, faster, the transformation frequency response less aliasing. Then, using the same impulse response digital filter design method to get good results.

When analog filter's frequency response above the folding frequency attenuation when the larger, faster, the transformed frequency response less aliasing distortion. At this point, not reform design of digital filters using impulse response in order to get good results.

When the analog filter frequency response place the weaken is bigger quickly when the folding frequency, after the transformation the frequency response aliased distortion is smaller.By now, used the pulse response political reform design the digital filter not to be able to obtain the good effect.

When analog filters the frequency response in the folding frequency attenuation over the bigger, the more quickly change when mixed with frequency response distortions the smaller stack. This is using a pulse response is no pre-reform design of digital filters can get good results.

When analog filter's frequency response above the folding frequency attenuation when the larger, faster, the transformed frequency response less aliasing distortion. At this point, not reform design of digital filters using impulse response in order to get good results.