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Which of the following methods are used to convert analog filter into digital filter?

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Which of the following methods are used to convert analog filter into digital filter?

(a) Approximation of Derivatives

(b) Bilinear transformation

(c) Impulse invariance

(d) All of the mentioned

This question was posed to me in an online interview.

I need to ask this question from Design of IIR Filters from Analog Filters topic in chapter Digital Filters Design of Digital Signal Processing

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The correct option is (d) All of the mentioned

The best I can explain: There are many techniques which are used to convert analog filter into digital filter of which some of them are Approximation of derivatives, bilinear transformation, impulse invariance and many other methods.

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