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Autocorrelation is a function of

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Autocorrelation is a function of

(a) Time

(b) Frequency

(c) Time difference

(d) Frequency difference

I got this question during an online exam.

Asked question is from Spectral Density and Autocorrelation topic in portion Signals and Spectra of Digital Communications

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The correct option is (c) Time difference

To explain: Autocorrelation is a function of time difference as it matches the signal with its delayed version.

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