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If a power signal has its power density spectrum concentrated about zero frequency, the signal is known as ______________

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If a power signal has its power density spectrum concentrated about zero frequency, the signal is known as ______________

(a) Low frequency signal

(b) Middle frequency signal

(c) High frequency signal

(d) None of the mentioned

The question was asked during an interview.

I would like to ask this question from Frequency Analysis of Discrete Time Signal in section Frequency Analysis of Signals and Systems of Digital Signal Processing

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Right answer is (a) Low frequency signal

Explanation: We know that, for a low frequency signal, the power signal has its power density spectrum concentrated about zero frequency.

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