Question

how to find order of the filters by given difference equation

Answer 1

hello friend here is your answer
Given a difference equation, how do we tell if it is an IIR filter or FIR filter? For example,

y(n) = x(n-3)+y(n-1) . Is it FIR or IIR? Can you please give me a way to figure this out? Thanks! :)

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askedJan 16 '14 at 4:56



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Non-Recursive filters are synonym to FIR filters. if you will take z transform of difference equation which is non recursive then you will find out poles for FIR can lie at only zero.Hence if the equation is non-recursive then surely it will represent a FIR filter and its z transform will have all poles at zero.for example, if you have y(n)=x(n)-2x(

i hope it will help you