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FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator

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precaud:

--- Quote from: DaveR on August 05, 2018, 04:27:34 pm ---I never could understand what the Text Window was supposed to be doing - even fremen's version seems to just convert all the data points to integers (try loading the sinc-pulse file I uploaded earlier, and you'll see the waveform in block form with values -1 to 5). 
--- End quote ---

With ver 6 SW, it showed the data values scaled to signed 14-bit integer values. I would think that is what it is supposed to show.


--- Quote ---If you upload to Loading Area 2, won't you overwrite the factory-stored square wave there?  The empty loading areas are from 64 back to ?? (can't remember offhand).
--- End quote ---

Could be - I wasn't paying attention to that  :)  I assume there's a way to reset the unit and restore the original factory waveforms?

rhb:

--- Quote from: soundtec on August 05, 2018, 02:43:54 pm ---
Theres a guy I know who runs a reseach project for one of the universities here ,he's invloved in siesmic data aquisition  from sea bottom tranducers around the coast ,I bet he could save massively on his overheads by creating his own supercomputer from PI's.


--- End quote ---

Who is it?  I'd like to look into it.

FWIW Intel and AMD CPUs are more cost effective than any of the alternatives.  The basic problem is tuning the software to particular architectures.  Most algorithms are trivially parallel so everyone just runs 10-20,000 cores for a week or two for industrial work.

Seismic is both CPU intensive *and* I/O intensive.  For example, Kirchoff migration requires summing 10e5-6 points into 10e12-14 points.  And that's the *fast* algorithm.  The serious stuff is an order of magnitude more work. I have an MPI based Kirchoff code I'd be happy to give to him.  I wrote it as a commercial project when I got laid off in '98, but faced with the cost of selling it vs a job I was offered, I took the job.

If he's using the CWP SU package then he will know who I am. I did a lot of work on it for many years and also arranged for the SLT SU version to be donated to MInes. 

DaveR:

--- Quote from: DaveR on August 05, 2018, 04:27:34 pm ---If you upload to Loading Area 2, won't you overwrite the factory-stored square wave there?  The empty loading areas are from 64 back to ?? (can't remember offhand).

--- End quote ---

It's ok - just my memory fading again!  There are 97 slots in all, 33 for presets and 64 for User / ARB.  The first 32 ARB slots already contain copies of most of the presets, which can be overwtitten, and slots 33 - 64 are empty.

soundtec:
Thanks for that Rhb, :clap:

I'll certainly tell him next time I see him ,he was supposed to be in touch about his music projects but I didnt hear back ,I dont have a number for him but I'm likely to see him or one of his brothers in the neighbourhood at some point . Like all research he has to justify his budgets ,something neat and tidy like PI/Bitscope data aquisition farm might allow him to get very good number crunching horsepower for small money , I think it probably takes time to interpret the data the way he's set up now ,but the possibility of realtime or near realtime processing sounds very exciting . A portion of the work involves the use of gps synchrous clocking and triangulation  to work out very precisely the locations of the under sea Hydrophones ,then precise sum and difference calculations can be done to determine the depth as well as latitude and longitude of siesmic events. Its easy to see why such a system could be of value for coastal patrol/protection too, but they do say even the ocean has had ears for years and years ;)

rhb:
Sounds very cool.  I'd love to do some  seismic work again even if I didn't make any money as long as it presented a new and different problem.  It sounds as if your friend has one.

I got 3 HP Z400s with 6 GB of ECC DRAM and quad core 2.9 GHz Xeons for $300 plus shipping via eBay.  That's probably several million times the compute that I shared with the entire department in grad school in Austin.  There's no way $300 worth of Pis will touch that for seismic processing.

Ask your friend if he uses Seismic Unix from CWP.

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