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What are the important block(s) required to process an input analog signal to get an output analog signal?

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What are the important block(s) required to process an input analog signal to get an output analog signal?

(a) A/D converter

(b) Digital signal processor

(c) D/A converter

(d) All of the mentioned

I have been asked this question in an interview for job.

My question is based upon Signals, Systems and Signal Processing in division DSP – Basic Signaling of Digital Signal Processing

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Right option is (d) All of the mentioned

Easy explanation: The input analog signal is converted into digital using A/D converter and passed through DSP and then converted back to analog using a D/A converter.

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