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Zero-order hold used in practical reconstruction of continuous-time signals is mathematically represented as a weighted-sum of rectangular pulses shifted by:

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Zero-order hold used in practical reconstruction of continuous-time signals is mathematically represented as a weighted-sum of rectangular pulses shifted by:

(a) Any multiples of the sampling interval

(b) Integer multiples of the sampling interval

(c) One sampling interval

(d) 1 second intervals

I got this question during an interview.

My question is from The Z-transform Analysis of Sampled-Data Control Systems in section Digital Control Systems of Control Systems

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Right choice is (b) Integer multiples of the sampling interval

For explanation: Zero-order hold is used to reconstruct the continuous-time signal which is represented as a weighted sum of rectangular pulses shifted by integer multiples of the sampling interval.

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