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FIR:
* there is no feedback from the output, hence the response will be finite.
* poles lie on the origin.
* to get the better step-up(HP filter) or step-down(LP filter) response, the number of taps should be more, hence it increases the processing time of the system.
* gives linear phase
* the system is stable as all the poles lie in the origin.
IIR:
* there is a feedback given from the output to input, hence the response of the filter is infinite, irrespective of the inputs.
* easy to implement, also the calculation or processing time is less, as we can get the step-up and step-down response with a fewer taps.'
* even IIR can be designed for linear phase
* the system should be desinged for stability, but by default it may or may not be stable.
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