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Can a Logic Analyzer be used for video capturing

Discussion in 'Electronic Design' started by [email protected], Mar 16, 2005.

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  1. Guest

    Ive been looking at a couple of usb logic analyzers, but it occured to
    me, is it feasible to also use it as a slow video capture?

    How can I determine if its fast/deep enough to capture a full frame of
    digital data going out to a dac for rs-170? Is there a formula?


    USBEESX: 8 Channel, Signal Generation Capability, i2c/spi monitor, 24
    Msps$295: http://www.usbee.com/comp.html
    LogicPort: 34 Channel, No Signal Generation Capability, $380:
    http://www.pctestinstruments.com/

    Ben
     
  2. Robert Baer

    Robert Baer Guest

    The function of a logic analyzer is totally different and "alien" to
    video capture, that it begs the question as to what you know about
    electronic equipment (at minimum).
     
  3. Nico Coesel

    Nico Coesel Guest

    A logic analyzer is perfectly suitable for reading an ADC output. If
    the LA allows to save the captured data (and even better, control
    triggering), you can use it to capture anything digital. I've used a
    Tektronix DAS9200 to capture data from an ADC while being controlled
    by a VB application.
     
  4. mike

    mike Guest

    Of course it can store the output of an A/D converter. Emphasis on the
    slow. If you put an A/D in front of a logic analyzer, you get a DSO.
    Length of time you want to capture / sampling rate = memory depth

    So, the answer to your question is yes, but doing anything useful is
    unlikely.
    mike


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  5. Bob

    Bob Guest

    I think, rather, it raises the question whether or not you know what "begs
    the question" really means.

    Bob
     
  6. Rich Grise

    Rich Grise Guest

    That's running rampant these days. I can't think of a single time in the
    last five or ten years that I've heard _anyone_ use that expression
    properly - they _all_ use that same wrong meaning.

    They should at least say, "begs _for_ the question."

    Ah, well, as The Good Doctor said, "Against stuipdity, the gods themselves
    contend in vain."

    Thanks,
    Rich
     
  7. Nial Stewart

    Nial Stewart Guest

    They should at least say, "begs _for_ the question."

    A bit like when Americans (mostly) say "write me", then they
    mean "write to me".

    How was the 'to' dropped?

    Nial.
     
  8. xray

    xray Guest

    It's easy do.

    How about the expression "ring me" or "ring me up"? Does that bother you
    too? If you can ring me then I don't see why I can't write you.

    As long as we are asking pointless questions, what's up with Worcester?
    Was it a case of an odd spelling choice at the beginning, or did
    pronunciation evolve over time?
     
  9. Jim Thompson

    Jim Thompson Guest

    It's there. We 'mer'cans have just learned to mumble like Brits ;-)

    ...Jim Thompson
     
  10. I read in sci.electronics.design that xray <>
    The latter. The 'cester' part is from Latin 'castra' - a (military) camp
    or the later Romano-British and then Saxon 'ceaster' - a fortified
    settlement.

    I couldn't find the original British (Celtic) or Roman name of the place
    with Google, but it's probably there somewhere. It wasn't a very
    important Roman camp.

    Many of these irregular geographical pronunciations date from the 12th
    and 13th centuries, when English was under very strong Norman French
    influence. But some are actually survivals of earlier place names.
     
  11. Paul Burke

    Paul Burke Guest

    John Woodgate wrote:

    Hwicwara-ceaster- the 'chester' of 'Hwic wara'- the people of the Saxon
    tribe Hwicce. Reduced in pronunciation to Hwic- waracester, then the
    prefix dropped. This tribe's territory extended over much of central
    England, and left many other names, notably the rather lovely and
    mysterious Wychwood. The name Hwicca could be actually Brythonic rather
    than Saxon, meaning 'forest people'.
    One of the best was Shropshire, which the Normans minced to Salop, being
    unable to negociate the consonant cluster. When the European
    parliamentary constituencies were created, the one covering the area was
    named Salop, which caused much mirth among their French speaking
    colleagues ('salope' is 'bitch').

    Paul Burke
     
  12. In the sense of 'shrew' or 'termagant', rather than 'dog ma'?
     
  13. My dogma got run over by my karma.

    %-}
     
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