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Designing the IIR filters

Explain that why the impulse invariant method is not preferred within the design of the IIR filters rather than the low pass filter?

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Within this method, mapping from the s plane to the z plane is considered as many to one. Therefore, there occur an infinite number of poles which map to same location within the z plane, generating an aliasing effect. It is considered as not appropriate for developing the high pass filters. Thus, this method is not as much preferred. 

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