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MCQ Practice Question

If a band-limited signal is sampled above its Nyquist rate, ideal reconstruction uses sinc interpolation because the ideal reconstruction filter has a?

ARectangular frequency response
BTriangular time response only
CConstant impulse at every sample
DHigh-pass response

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Correct Answer: A. Rectangular frequency response

Explanation: An ideal brick-wall low-pass filter has a rectangular frequency response and a sinc-shaped impulse response, leading to sinc interpolation.

Reference: Standard signals and systems: sampling

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