Hello Larry,

What I mentioned would be in realtime, will a little itty bitty delay.
but is is a mess to set up.

Angel

Tuesday, July 10, 2007, 9:49:44 PM, you wrote:

> Hi Angel,

> Thanks for the info.  My original intention was to add a real time FFT
> waterfall display to my home brew data logging program.  I thought it 
> would be interesting to watch the spectrum of an incoming event in 
> addition to the time domain signal.  I'm not as interested in an after
> the fact, "postmortem" display.

> I used some public domain C code for the FFT that wasn't very well 
> documented.  I'm getting some sort of data in the waterfall, but it 
> clearly ain't right.  Got side tracked and didn't get back to it. 
> Somebody posted a link to a site that evidently has source code for the
> FFT and much better documentation.  When I get the time I'll take a look
> at it and perhaps replace what I had with something a little better written.

> Larry


> Angel wrote:
>> Hello Larry,
>> 
>> Swarm does realtime spectrogrmas of log of frequency and log of power
>> displays of seismic signals.
>> 
>> You could go directly to from winsdr to earthworm to a waveserver and
>> from the wave server to Swarm.  I know what I just said is cryptic but
>> if you need more detail I would be glad to get it to you.  I can send
>> you a screen shot of what the display looks like if you want.
>> 
>> Angel
>> \
>> Sunday, July 8, 2007, 7:56:30 PM, you wrote:
>> 
>>> A couple of years ago I experimented with adding a real-time FFT 
>>> waterfall display to my home brew data logging and display program. I
>>> got the waterfall working just fine but there is something wrong with 
>>> the FFT calculation that I never got around to debugging.  The current
>>> discussion may motivate me to take another look at it.  If I manage to
>>> get something working, it wouldn't be much additional effort to adapt 
>>> the code into an independent program that would take PSN files as a data
>>> source.
>> 
>>> Larry Conklin
>>> Liverpool, NY
>>> lconklin@............
>>> __________________________________________________________
>> 
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>> 
>> 
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-- 
Best regards,
 Angel

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