Evaluate performance of FFT Windows

1. How does windowing affect FFT?
2. What is window size in FFT?

How does windowing affect FFT?

You can minimize the effects of performing an FFT over a noninteger number of cycles by using a technique called windowing. Windowing reduces the amplitude of the discontinuities at the boundaries of each finite sequence acquired by the digitizer.

What is window size in FFT?

The FFT window size is typically a power of 2. If your sampling rate is 44,100 samples per second, then a window size of 32 samples is about 0.0007 s, and a window size of 65536 is about 1.486 s. There's a tradeoff in the choice of window size.