[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: spectral density plot
From: |
Paul Kienzle |
Subject: |
Re: spectral density plot |
Date: |
Wed, 14 Feb 2001 18:21:50 +0000 |
User-agent: |
Mutt/1.2.5i |
Here is a signal sampled at 11025 with spikes at 500, 1000, 1500, 2000, 2500 Hz
fs=11025; t=0:1/fs:1; t=t(1:8192); x=sum(sin(2*pi*500*[1:5]'*t));
Here is its spectral plot:
r = spectral_xdf(x);
plot(r(:,1)*fs, r(:,2));
In your case, use fs=5000 and label your x-axis in MHz.
Paul Kienzle
address@hidden
On Wed, Feb 14, 2001 at 09:53:19AM -0700, Ben Sapp wrote:
> Hello,
>
> I am having a little trouble using the spectral density estimators in
> Octave. I have a waveform with 500 samples. Each sample is 200
> picoseconds apart. I would like to make a plot of the spectral density
> vs. frequency. Using spectral_xdf I am able to get a vector that is
> supposed to represents the spectral density. The first column is a set
> of numbers from 0-1. Should I scale these by some factor to get the
> frequencies?
>
> Thanks
>
> --
> Ben Sapp Los Alamos National Laboratory
> email: <mailto:address@hidden> Phone: (505)667-3277
> Fax: (505)665-7920 URL: http://www.neutrino.lanl.gov/
> --
>
>
>
> -------------------------------------------------------------
> Octave is freely available under the terms of the GNU GPL.
>
> Octave's home on the web: http://www.octave.org
> How to fund new projects: http://www.octave.org/funding.html
> Subscription information: http://www.octave.org/archive.html
> -------------------------------------------------------------
>
>
-------------------------------------------------------------
Octave is freely available under the terms of the GNU GPL.
Octave's home on the web: http://www.octave.org
How to fund new projects: http://www.octave.org/funding.html
Subscription information: http://www.octave.org/archive.html
-------------------------------------------------------------