Software Spectrum Analyzer

Hi to all,

I'm a student, I'm currently studying: AM, PM, FM, PCM modulation,
noise impact on signal etc. I'd like to be able to graphical view
spectrum of baseband and bandpass signal implicated . I'd like to
know, if there is any software, that could help me to be better
understand the matter, where I can manually input the function which
represent the signal eg. S(t) = Ac [ 1 + cos ( 2 pi fc t )] and plot
graph of signal in time / frequency domains.

Thank you very much

Bye
Maurizio

Maurizio wrote:
> Hi to all,
> 
> I'm a student, I'm currently studying: AM, PM, FM, PCM modulation,
> noise impact on signal etc. I'd like to be able to graphical view
> spectrum of baseband and bandpass signal implicated . I'd like to
> know, if there is any software, that could help me to be better
> understand the matter, where I can manually input the function which
> represent the signal eg. S(t) = Ac [ 1 + cos ( 2 pi fc t )] and plot
> graph of signal in time / frequency domains.
> 
> Thank you very much
> 
> Bye
> Maurizio

Not spectrum analyzers per se, but I would suggest looking at
Scilab (http://www.scilab.org/) and gnuplot (http://www.gnuplot.info/).

I'm keying on you describing yourself as a "student". These a good 
general purpose tools.

On Mar 26, 11:49&#4294967295;am, Maurizio <galia...@yahoo.com> wrote:
> Hi to all,
>
> I'm a student, I'm currently studying: AM, PM, FM, PCM modulation,
> noise impact on signal etc. I'd like to be able to graphical view
> spectrum of baseband and bandpass signal implicated . I'd like to
> know, if there is any software, that could help me to be better
> understand the matter, where I can manually input the function which
> represent the signal eg. S(t) = Ac [ 1 + cos ( 2 pi fc t )] and plot
> graph of signal in time / frequency domains.
>
> Thank you very much
>
> Bye
> Maurizio

Since you're a student, I would direct you to "Understanding Digital
Signal Processing" by Richard Lyons. Inside that book, I would refer
to the section called "A Practical Spectrum Analyzer." I don't have
the book handy right now so I don't know the exact section number. It
describes the Weighted Overlap-Add (WOLA) technique, which is good for
generating a good spectrum estimate. Other than that, you can use
Welch's method or something similar. Matlab or its imitators can
generate that easily.

Jason

On Mar 26, 8:49 am, Maurizio <galia...@yahoo.com> wrote:
> Hi to all,
>
> I'm a student, I'm currently studying: AM, PM, FM, PCM modulation,
> noise impact on signal etc. I'd like to be able to graphical view
> spectrum of baseband and bandpass signal implicated . I'd like to
> know, if there is any software, that could help me to be better
> understand the matter, where I can manually input the function which
> represent the signal eg. S(t) = Ac [ 1 + cos ( 2 pi fc t )] and plot
> graph of signal in time / frequency domains.
>
> Thank you very much
>
> Bye
> Maurizio

You haven't said what your computer resources are. There are spectrum
analyzers that could be used with tools such as those Richard has
suggested. For examples:

PC
Spectrogram Version 16
A Product of Visualization Software LLC by Richard Horne
Up to 24 bit, 96 kHz Analysis.
Compatible with Windows Vista and Windows XP.
http://www.visualizationsoftware.com/gram.html

Linux
Spectrum Analyzer
Versatile high speed displays and
time-frequency browsing for Linux!
http://www.baudline.com/download.html

MAC
Blue Cat's FreqAnalyst 1.2
http://mac.softpedia.com/get/Audio/Blue-Cat-s-FreqAnalyst.shtml

YMMV

Dale B. Dalrymple

dbd wrote:
> On Mar 26, 8:49 am, Maurizio <galia...@yahoo.com> wrote:
> 
>>Hi to all,
>>
>>I'm a student, I'm currently studying: AM, PM, FM, PCM modulation,
>>noise impact on signal etc. I'd like to be able to graphical view
>>spectrum of baseband and bandpass signal implicated . I'd like to
>>know, if there is any software, that could help me to be better
>>understand the matter, where I can manually input the function which
>>represent the signal eg. S(t) = Ac [ 1 + cos ( 2 pi fc t )] and plot
>>graph of signal in time / frequency domains.
>>
>>Thank you very much
>>
>>Bye
>>Maurizio
> 
> 
> You haven't said what your computer resources are. There are spectrum
> analyzers that could be used with tools such as those Richard has
> suggested. For examples:
> 
> PC
> Spectrogram Version 16
> A Product of Visualization Software LLC by Richard Horne
> Up to 24 bit, 96 kHz Analysis.
> Compatible with Windows Vista and Windows XP.
> http://www.visualizationsoftware.com/gram.html

Just downloaded. Nice, thanks.


> 
> Linux
> Spectrum Analyzer
> Versatile high speed displays and
> time-frequency browsing for Linux!
> http://www.baudline.com/download.html
> 
> MAC
> Blue Cat's FreqAnalyst 1.2
> http://mac.softpedia.com/get/Audio/Blue-Cat-s-FreqAnalyst.shtml
> 
> YMMV
> 
> Dale B. Dalrymple

On Mar 27, 4:49 am, Maurizio <galia...@yahoo.com> wrote:
> Hi to all,
>
> I'm a student, I'm currently studying: AM, PM, FM, PCM modulation,
> noise impact on signal etc. I'd like to be able to graphical view
> spectrum of baseband and bandpass signal implicated . I'd like to
> know, if there is any software, that could help me to be better
> understand the matter, where I can manually input the function which
> represent the signal eg. S(t) = Ac [ 1 + cos ( 2 pi fc t )] and plot
> graph of signal in time / frequency domains.
>
> Thank you very much
>
> Bye
> Maurizio

LabView will do this for you.


Hardy

On Mar 26, 8:52&#4294967295;pm, HardySpicer <gyansor...@gmail.com> wrote:
> On Mar 27, 4:49 am, Maurizio <galia...@yahoo.com> wrote:
>
> > Hi to all,
>
> > I'm a student, I'm currently studying: AM, PM, FM, PCM modulation,
> > noise impact on signal etc. I'd like to be able to graphical view
> > spectrum of baseband and bandpass signal implicated . I'd like to
> > know, if there is any software, that could help me to be better
> > understand the matter, where I can manually input the function which
> > represent the signal eg. S(t) = Ac [ 1 + cos ( 2 pi fc t )] and plot
> > graph of signal in time / frequency domains.
>
> > Thank you very much
>
> > Bye
> > Maurizio
>
> LabView will do this for you.
>
> Hardy

this one is good too

http://freenet-homepage.de/dl4yhf/spectra1.html

Mark