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What is the general range of a period of a signal?

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What is the general range of a period of a signal?

(a) It can have of any value from positive to negative

(b) It can be negative

(c) It can be positive

(d) It is always positive

This question was addressed to me during an interview.

I need to ask this question from Periodic Signals in chapter Fourier Series of Signals and Systems

1 Answer

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Correct option is (d) It is always positive

Easy explanation: The period of a periodic signal is always positive. The smallest positive value of a periodic interval is called a fundamental period in case of both discrete and continuous time signal.

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