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MathGroup Archive 2003

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Re: Signal Processing Help please..

  • To: mathgroup at smc.vnet.net
  • Subject: [mg43799] Re: [mg43755] Signal Processing Help please..
  • From: YAT <yat at omrf.ouhsc.edu>
  • Date: Mon, 6 Oct 2003 02:07:52 -0400 (EDT)
  • Organization: OMRF
  • References: <200310030628.CAA01263@smc.vnet.net>
  • Reply-to: yat at omrf.ouhsc.edu
  • Sender: owner-wri-mathgroup at wolfram.com

After Fourier transform, take the Re or Im parts and plot these.

ListPlot[Re[Fourier[s]]//Chop, PlotJoined->True, PlotRange->All]

OR

ListPlot[Im[Fourier[s]]//Chop, PlotJoined->True, PlotRange->All]

Yas

Marcos G. wrote:
> Hi guys,
> I am a new user of Mathematica 4.0 and I am trying to do some signal
> analyzis when I get some weird errors with Mathematica.
> Please, any help are welcome and I really appreciate it.
> What I want to do is:
> 
> I have this PAM signal definition:
> 
> s(t) = Sum(ak p(t-kT),k=0,k=15)
> 
> {ak} is a binary sequence with k going from 0 to 15
> ak = {0010011010111100}
> 
> And p(t) is a pulse:
> 
>             +------+
>              |           |
>              |           |
> +-------+          +-------+
> -1.5  -0.5   0   0.5      1.5  ---------------->
>                                                                  t
> 
> More details is attached in the notebook file.
> [contact the author to get the attachmenet -moderator]
> 
> What I want to do is to get the Fourier Transform of the PAM signal
> s(t).
> 
> The problem is that when I plot this fourier transform I am getting
> always:
> 
> "is not a machine size real number...."  and the plots comes empty, just
> with the axis.
> 
> For me it seems ok, but I can't understand why is complaining.
> 
> Thanks you all..
> 
> Marcos
> 
> 
> 


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