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IIR Filter design

Lots of time was spent in designing a High Pass IIR Filter using IIM, but in the end we realized that it was not possible. This was because of the many-to-one mapping of frequencies when using IIM method of filter design.

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  1. IIR filters are the most efficient type of filter to implement in DSP.

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  2. Bilinear Transform is preffered over IIM for designing High pass filters and Band-stop filters. Moreover, it has one to one mapping and no aliasing effect as in IIM.

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  3. Because of the feedback necessary in an implementation, the Infinite Impulse Response (IIR) Filter is also called a recursive Filter.

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  4. Since we had to plot the magnitude spectrums, MATLAB is a better choice as it has inbuilt plotting functions.

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  5. IIM is also not suitable for Band Pass Filter design because of the same reason.

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