Filter realization by approximation derivative method

Q.  The filter that may not be realized by approximation of derivatives techniques are

1) Band pass filters
2) High pass filters
3) Low pass filters
4) Band reject filters
- Published on 26 Nov 15

a. 1, 2 and 3 are correct
b. 2 and 4 are correct
c. 2 and 3 are correct
d. All the four are correct

ANSWER: 2 and 4 are correct

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