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Amusing Myself !-)

Discussion in 'CAD' started by Jim Thompson, Sep 12, 2003.

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  1. Jim Thompson

    Jim Thompson Guest

    Amusing Myself with how simple certain things can be solved with a
    circuit !-)

    See "WonderWhatThisIsGoodFor.pdf" on the S.E.D/Schematics page of my
    website.

    ...Jim Thompson
     
  2. John Jardine

    John Jardine Guest

    Looks to me like a complicated field sync generator for a TV. ?
    regards
    john
     
  3. Jim Thompson

    Jim Thompson Guest

    Look more closely... the Input Signal is at the bottom of the page,
    the output signal is at the top.

    ...Jim Thompson
     
  4. Dana Raymond

    Dana Raymond Guest

    I'm a little confused as to where the output is, but I'd say its either a
    video scrambler or a descrambler. MUNGED looks like a scrambled signal in
    that the horizontal sync pulse (front porch, sync tip, back porch, and
    presumably color burst) are "pushed up" into the video field, but only for
    the non-vertical sync portion of the field.

    TV's cannot distinguish the horitonal sync from the video content, and that
    results in 'tearing' of the image. However, its important that the field be
    understood during the VITS interval so that the video decrambler can receive
    the digital information on which channels to descramble.

    The descramblers frequently use the stereo pilot (modified from 19KHz to
    15750Hz (or so, I forget)), which is transmitted synchronous with the
    horizontal sync from the original video feed and use it to "push down" the
    horitontal sync back into place.

    Am I Right? Do I win a prize!!! :~)
    Dana
     
  5. Genome

    Genome Guest

    Since you don't tell us what it does it's good for nothing. That makes you a
    crossposting troll. Congratulations.

    Closest I can guess is it provides a trigger pulse for fields 1 or 5 on a
    PAL/NTSC/SECAM system.

    Pray And Learn
    Never The Same Color (sic) Twice
    Sometimes Even Colour Appears Momentarily

    That's only because someone else designed one and I got to build it back
    in..... oooh 1982 on a degree placement.. It wasn't a spice model and it
    worked. It came with another bunch of stuff in CMOS that selected a
    particular line from a particular field that triggered the thing that
    recorded it.

    Clever bloke, learnt some shit.

    DNA

    If you read my shit
     
  6. Jim Thompson

    Jim Thompson Guest

    Rarely, you're generally so rude I think you must be French ;-)

    The circuit extracts sync from a (Jerrold-style) suppressed sync
    signal. Uses two one-shots and some gating. Once sync is found in
    the (clean) VBI it know where to look thenceforth by suppressing the
    garbage in the next ~63.5us, re-syncing the one-shots each line.

    ...Jim Thompson
     
  7. Genome

    Genome Guest

    Didn't understand that so..... 'it's **** all use'.

    Excellent. Where can I not buy one? :>)

    DNA
     
  8. Dana Raymond

    Dana Raymond Guest

    So, I got it right then!
    WooHoo!
    Dana
     
  9. I heard....

    Pale And Lukewarm
    No Two Similar Colours
    Sickly European Colour Almost Monochrome

    Chris
     
  10. Never Twice the Same Colour
    System Essentially Contrary to the American Method
    Perfection At Last
     
  11. Jim Thompson

    Jim Thompson Guest

    I pulled it as potentially illegal. Don't know why I had the urge to
    post it in the first place.

    ...Jim Thompson
     
  12. Should be between Water... and WWVB..., but I don't see it.


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  13. Fred Bloggs

    Fred Bloggs Guest

    Some eastern European is furiously at work making it into a kit for sale
    by SPAM right now.........
     
  14. Jim Thompson

    Jim Thompson Guest

    Could be, but there's several required elements missing from the
    "conceptual" representation that a non-EE would have real problems
    with.

    ...Jim Thompson
     
  15. Mjolinor

    Mjolinor Guest

    Oxymoron
     
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