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Low pass Butterworth filters are also called as _____________

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Low pass Butterworth filters are also called as _____________

(a) All-zero filter

(b) All-pole filter

(c) Pole-zero filter

(d) None of the mentioned

The question was asked during an interview.

The query is from Characteristics of Commonly Used Analog Filters topic in chapter Digital Filters Design of Digital Signal Processing

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Right option is (b) All-pole filter

Easiest explanation: Low pass Butterworth filters are also called as all-pole filters because it has only non-zero poles.

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