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From: Ruben on 17 Mar 2010 07:18
Hi,

I performed a fast fourier transform on my Volt data: b=fft(data).

Next I scaled the frequency (variable a) axis and I plotted both b and a.

Now I am wondering what the fft power values are. Are they in Volts? Thanks for help!

Ruben
From: Greg Heath on 22 Mar 2010 17:12
On Mar 17, 11:18 am, Ruben <rubenregtersc...(a)hotmail.com> wrote:
> Hi,
>
> I performed a fast fourier transform on my Volt data: b=fft(data).
>
> Next I scaled the frequency (variable a) axis and I plotted both b and a.
>
> Now I am wondering what the fft power values are. Are they in Volts? Thanks for help!

Power corresponding to data in volts or amps is interpreted
as the dissipation in a 1-ohm resistor. therefore, the correct
dimension is watts.

p = data.^2.

See my post on power spectral scaling

"greg heath" power spectral scaling

http://groups.google.com/group/comp.soft-sys.matlab/msg/2222327db2ea7f51?hl=en

Hope this helps.
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