PSN-L Email List Message
Subject: Re: FFT Waterfall display
From: Angel sismos@..............
Date: Wed, 11 Jul 2007 00:34:12 +0000
What I mentioned would be in realtime, will a little itty bitty delay.
but is is a mess to set up.
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.
> 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.
>> 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
>>> Larry Conklin
>>> Liverpool, NY
>>> Public Seismic Network Mailing List (PSN-L)
>>> To leave this list email PSN-L-REQUEST@.............. with
>>> the body of the message (first line only): unsubscribe
>>> See http://www.seismicnet.com/maillist.html for more information.
> Public Seismic Network Mailing List (PSN-L)
> To leave this list email PSN-L-REQUEST@.............. with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
Public Seismic Network Mailing List (PSN-L)
[ Top ]
[ Back ]
[ Home Page ]