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The auto-correlation function is _________

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The auto-correlation function is _________

(a) impulse function

(b) linear function

(c) odd function

(d) even function

I have been asked this question in unit test.

Query is from FM Receiver topic in section Receivers & Transducers of Analog Communications

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The correct answer is (d) even function

Easiest explanation: Auto-correlation is an even function. Sometimes it is also known as serial-correlation. It is the correlation of a function with a delayed copy of itself.

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