OooooH Kay...  Now I'm beginning to get motivated.  I've already got 
something running real time, just have to debug the thing to make the 
FFT algorithm run correctly.  Nothing like a declaration of 
impossibility to get the old juices flowing again.

Larry

Geoffrey wrote:
> It Is My Sincere Belief that you will
> not be able to get anywhere near
> realtime with a home PC simply because
> too many complicated iterations must
> be made for many discrete points.
> 
> You will have to settle with after the fact
> processing.
> 
> I have tried a FFT program myself using
> my own data on a 3GHz machine and it takes
> 11 seconds to process 29 minutes of data
> each line of spectrum being seperated by
> 4.5 seconds in time.
> Each line pass representing 56.2 seconds of time.
> 
> ----- Original Message ----- From: "Larry Conklin" 
> To: "PSN List" 
> Sent: Sunday, July 08, 2007 12:56
> Subject: FFT Waterfall display
> 
> 
>> 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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