I have a $512$ sample frame, lets call it X
. The frame is further divided into four sub-frames of $128$ samples each. Each of these sub-frames have a different frequency.
For STFT, I use MATLAB's gausswin(N)
function where N
is equal to $128$ in my case to generate a Gaussian window, let's call it W
. I zero-pad my windows W
to make it equal to $512$ samples.
I now multiply my original frame X
point by point with W
to get y
. I then take FFT
of y
to get Y
. It works till here.
My question is, naturally the next logical step should be to shift my zero-padded window W
to right by 128 samples and repeat the multiply and FFT
procedure again.
- But how do I accumulate these results?
- Concretely, how do I convert it into a time-frequency plot?