Question

What is used to eliminate 1/f noise? Please explain why.

A) Signal averaging
B) Amplify the spectrum
C) Background correction
D) Lower the temperature

Answer 1

SIGNAL AVERAGING used to eliminate noise from the signal.

The averaging process could be done using a continuous record of V(t), but it is more common to sample the input with an analog to digital converter at regular intervals ∆t so that the required computations can be done digitally. Unfortunately the sampling process introduces the possibility of aliasing . Evidently input frequencies from zero to 1/(2∆t) are all distinguishable, but if higher frequencies are present they will be confused with some lower frequency. The highest distinguishable frequency is called the Nyquist frequency, 1/(2∆t). Experimentally, it is important to avoid aliasing by low-pass filtering the input before sampling and choosing ∆t small enough that the Nyquist frequency is well above the pass limit. Several factors limit the degree of S/N enhancement attainable by averaging.

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source : with help of google