Digital filter role

We know that Rectangular Window has steep drop in gain and so we get ripples in the pass band and stop band. But if we need ideal response for any filter there has to be steep drop in the gain at the cut off frequency

So how does digital filters avoid these ripples that to when ever we are trying to get nearer to the ideal response



  • arunchary
    not exactly but it will do 70 to 90% in general where digitized system implemented in communication media etc .
  • Jeffrey Arulraj
    Jeffrey Arulraj
    Yeah I was looking into some filters and they had a very little variations from ideal response But they did not have ripples at all

    How is that possible sir

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