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Which of the following is not involved in signal averaging?

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Which of the following is not involved in signal averaging?

(a) A system to repeatedly scan the spectral region of interest

(b) Some storage device to store information

(c) A system to coherently add individual spectra

(d) Sweep generator

I have been asked this question in semester exam.

My question is from Sensivity Enhancement for NMR Spectroscopy topic in chapter Nuclear Magnetic Resonance Spectrometer of Analytical Instrumentation

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The correct answer is (d) Sweep generator

The best I can explain: Sweep generator is not involved in signal averaging. This is usually accomplished using a small computer.

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