On Aug 14, 12:29 pm, "keerthi.madyasth"
<keerthi.madyas...@tessolve.com> wrote:
> Hii
> How to calculate PSD from FFT??
> From the FFT I have got Real and imaginary parts and i would like to know
> how to calculate the PSD without using correlation function.
> If possible i would like to know the steps involved.

Apply any scaling required by the FFT routine you have used.

Calculate the magnitude squared in each bin.

Convert to the appropriate units for the type of signal you are
measuring. For this see:

Choose your Units!   (PWR, PSD, ESD)
www.bksv.com/doc/bo0438.pdf


Dale B. Dalrymple

On Aug 14, 12:29�pm, "keerthi.madyasth"
<keerthi.madyas...@tessolve.com> wrote:
> Hii
> How to calculate PSD from FFT??
> From the FFT I have got Real and imaginary parts and i would like to know
> how to calculate the PSD without using correlation function.
> If possible i would like to know the steps involved.

Simplest way is to take the magnitude squared and divide by N (no of
points). This will give you the periodogram (PSD).
There are ways to average this of course as well over successive
frames.

Hardy

Hii 
How to calculate PSD from FFT??
From the FFT I have got Real and imaginary parts and i would like to know
how to calculate the PSD without using correlation function.
If possible i would like to know the steps involved.