Why does the frequency window affect the inverse fourier transform oscillation frequency?

1. What are the effects of windowing?
2. What does inverse Fourier transform tell us?
3. Why do we use Hanning window?
4. What does a Hamming window do?

What are the effects of windowing?

Windowing reduces the amplitude of the discontinuities at the boundaries of each finite sequence acquired by the digitizer. No window is often called the uniform or rectangular window because there is still a windowing effect.

What does inverse Fourier transform tell us?

The inverse Fourier transform is a mathematical formula that converts a signal in the frequency domain ω to one in the time (or spatial) domain t.

Why do we use Hanning window?

Leakage Reduction Choice of Window

The Hanning window is usually a good choice. The main advantage of controlling the leakage is an increase in the dynamic range of the analysis, as leakage may swamp signal components of close frequencies and much smaller magnitudes.

What does a Hamming window do?

The Hamming window is a taper formed by using a raised cosine with non-zero endpoints, optimized to minimize the nearest side lobe. Number of points in the output window. If zero or less, an empty array is returned. When True (default), generates a symmetric window, for use in filter design.