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What is the physical device that performs an operation on the signal?

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What is the physical device that performs an operation on the signal?

(a) Signal source

(b) System

(c) Medium

(d) None of the mentioned

This question was posed to me in examination.

Asked question is from Signals, Systems and Signal Processing in portion DSP – Basic Signaling of Digital Signal Processing

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Right option is (b) System

Explanation: A system is a physical device which performs the operation on the signal and modifies the input signal.

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