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y-axis of IFFT

Started by rongfenc March 9, 2002
I have a question. There is a signal which x-axis is freq. and y-axis
is Power Spectrum Density. After convert this freq. domain signal to
time domain(using IFFT), the x-axis is time, how about the unit in y-
axis?
Thank you.



Should be the autocorrelation function R of the signal.

Poochi

----- Original Message -----
From: "rongfenc" <>
To: <>
Sent: Friday, March 08, 2002 10:06 PM
Subject: [matlab] y-axis of IFFT > I have a question. There is a signal which x-axis is freq. and y-axis
> is Power Spectrum Density. After convert this freq. domain signal to
> time domain(using IFFT), the x-axis is time, how about the unit in y-
> axis?
> Thank you. >
>
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_________________________________________________________



The IFFT of the PSD of a signal is the autocorrelation function (ACF) of the
original time-domain signal.

Mark Egler
Analogic

> -----Original Message-----
> From: rongfenc [mailto:]
> Sent: Fri, March 08, 2002 10:07 PM
> To:
> Subject: [matlab] y-axis of IFFT > I have a question. There is a signal which x-axis is freq. and y-axis
> is Power Spectrum Density. After convert this freq. domain signal to
> time domain(using IFFT), the x-axis is time, how about the unit in y-
> axis?
> Thank you.