Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2003
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2003

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Signal Processing Help please..

  • To: mathgroup at smc.vnet.net
  • Subject: [mg43812] Re: Signal Processing Help please..
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Tue, 7 Oct 2003 02:40:51 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <blj5ft$1e2$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

the Fourier[]  transform may be complex, and you should Plot[]
the Abs[] value or the Arg[]ument

Regards
  Jens

"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


  • Prev by Date: How can I submit the reference to a publication that used Mathematica?]]
  • Next by Date: Re: Make Mathematica wait for File
  • Previous by thread: Re: Signal Processing Help please..
  • Next by thread: Re: Terras inverse