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Discussion Groups | Matlab DSP | y-axis of IFFT

Technical discussion about Matlab and issues related to Digital Signal Processing.

  

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y-axis of IFFT - rongfenc - Mar 9 3:06:00 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.





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Re: y-axis of IFFT - poochix - Mar 11 3:17:00 2002

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. >
>
> _____________________________________
> /groups.php3 _________________________________________________________
">http://mail.yahoo.com




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RE: y-axis of IFFT - Egler, Mark - Mar 11 14:09:00 2002

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.





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