HOW EXACTLY THIS MATLAB PROGRAM WORKS?

This is a program in which we are detecting error in rotating machines by recording their sound and passing it through matlab and comparing the different signals.

Answer 1

[Star Strider]

It takes the Fourier transform of the signal, subtracts the D-C offset, computes the power as the square of the magnitude of the Fourier transformed signal, convolves it with a Hanning window, and plots it.

[shilu]

SORRY I AM JUST A BEGINNER. COULD U TELL WHAT IS D-C OFFSET ,WHY ONLY POWER IS COMPUTED AND WHAT IS THE USE OF HANNING WINDOW

[Star Strider]

D-C offset is the mean (average) of the signal amplitude. You will have to ask the person who wrote the program why they chose to use power. The window essentially acts as a low-pass filter.