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Which of the following is not an advantage of undersampling?

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Which of the following is not an advantage of undersampling?

(a) Slower ADC

(b) Less power

(c) Fast microprocessors

(d) Low memory capacity

I had been asked this question during an interview.

I would like to ask this question from Data Conversion topic in portion Digital Communication Techniques of Avionics

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Right choice is (c) Fast microprocessors

The best explanation: Since in undersampling the time period between samples is sufficiently large, this allows slower processors to be used for ADC. This also allows low memory capacity for storage and less power consumption.

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