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Which of the following is not possible when the signal is analog?

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Which of the following is not possible when the signal is analog?

(a) Phase shifting

(b) Equalization

(c) Modulation

(d) Data compression

I had been asked this question in class test.

I'd like to ask this question from Digital Signal Processing in portion Digital Communication Techniques of Avionics

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Correct answer is (d) Data compression

The explanation: Data compression is done by checking redundancy in data. Data redundancy checking is only possible when the data is in digital form and hence data compression cannot be done in analog signals.

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