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From digital filter we will get the output pulse as the _______ of the current and the previous pulse.

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From digital filter we will get the output pulse as the _______ of the current and the previous pulse.

(a) Summation

(b) Difference

(c) Product

(d) Ratio

This question was posed to me in an online interview.

Asked question is from Correlative Coding in chapter Formatting and Baseband Modulation of Digital Communications

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Correct answer is (a) Summation

The best I can explain: The digital filter incorporates one digit delay and thus it adds the incoming pulse with the value of the previous pulse.

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