PSN-L Email List Message
Subject: Re: Re[2]: FFT Waterfall display
From: "Geoffrey" gmvoeth@...........
Date: Sat, 14 Jul 2007 16:15:50 -0700
Hello Michael and PSN;
LOL, do you really understand all that MATH gobblygoop.
I am not a Mathmatician and not even pretend to
be a programmer or Engineer.
I need the exact PowerBasic\Dos Source code
to compile a program useful with raw binary data.
Everyone seems to avoid BASIC and want to
use C because thats what they teach at the
University.
C is like a foreign language to me and if it is
not BASIC or Assembly I can not understand it.
Point me to a FREE FFT Basic Source Code
that does a complete conversion and
my ears will perk up.
The USN has spoiled me by being able to talk to laymen.
Cheers :-)
geoff
----- Original Message -----
From: "Michael Kimzey"
To:
Sent: Saturday, July 14, 2007 05:09
Subject: Re: Re[2]: FFT Waterfall display
> Hi all.
>
>>The power needed for a realtime FFT display
>>of any value just does not exist for a typical
>>home computer. You would need a special
>>card like these high speed video cards.
>>
>>I have seen the machines that do real time fft
>>and back in the 1970s they were like 1000X faster
>>than your home computer and would do 500 points
>>and be only a few milli seconds behind real time.
>>
> I'm don't completely understand all this FFT stuff, but a search of google
> revealed that you can get several programs for FFT and waterfall display.
> Spectrogram 5.1
> http://www.relisoft.com/science/Physics/fft.html <- provides a discussion
> of FFT and source code.
> Digipan - this is a amature radio program for communicating digitally using
> audio output from your sound card and has a very nice waterfall display.
> Spectran 2.0
>
> Maybe these are not doing something "FFT-wise", but Spectrograph and
> Spectran both allow you to set the FFT size and both have the moving
> graphical display...and are working on signals with sample rates of 44,000
> per second. I think that any seismological waterfall display would move
> -very- slowly...my samples-per-second are only 10 and should be able to
> perform some type of FFT. Even Win-Quake does FFT. Maybe I'm missing
> something...
>
> - Mike
>
>
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