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Which signal is sampled at regular intervals for the purpose of ADC?

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Which signal is sampled at regular intervals for the purpose of ADC?

(a) analog signal

(b) digital signal

(c) quantised signal

(d) sampled signal

I have been asked this question during an online interview.

This interesting question is from Errors of ADC Technique topic in chapter Interfacing to the Analog World of Embedded Systems

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The correct option is (a) analog signal

To explain: The analog signal is sampled at regular intervals for the analog to digital conversion. Each sample is then quantised to divided by a given value in order to identify the number of approximate analogue value.

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