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Video on an Oscilloscope — Parallax Forums

Video on an Oscilloscope

ercoerco Posts: 20,259
edited 2011-11-22 08:31 in General Discussion
http://www.youtube.com/watch?v=-FK7hy5usYE

Clever people make my day.

Comments

  • Spiral_72Spiral_72 Posts: 791
    edited 2011-11-21 13:56
    Holy cow! Look at that!!!

    Very clever indeed :)
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2011-11-21 14:18
    That's how CRT-based B/W TVs work. They're just big oscilloscopes with X, Y, and Z inputs, along with linear ramping to drive the H and V sweeps.

    -Phil
  • pedwardpedward Posts: 1,642
    edited 2011-11-21 14:55
    Let's not forget that O-scopes have electrostatic deflection, and a standard CRT has magnetic deflection. Some of the late Mitsubishi rear projection CRT televisions have fancy deflection control that is very similar to an O-scope.
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2011-11-21 16:21
    I didn't know that. Is magnetic deflection used to permit shorter tubes?

    -Phil
  • frank freedmanfrank freedman Posts: 1,983
    edited 2011-11-21 18:53
    Phil Pilgrim (PhiPi) wrote: »
    I didn't know that. Is magnetic deflection used to permit shorter tubes?

    -Phil

    More probably faster deflection times than magnetic deflection. Besides, they have always done it that way in nearly every O'scope I have put my hands into (including the OP-1 that tossed me on my @$$ years ago)

    Frank
  • $WMc%$WMc% Posts: 1,884
    edited 2011-11-21 19:07
    Its not how to reinvent the wheel...But how the wheel was invented....
    '
    Cool.............
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2011-11-21 19:11
    I always wondered why the NTSC horizontal blanking interval had to be so long. Magnetic deflection must be part of the reason. (It's a good thing, too. Else there might not've been room for the color burst later on.)

    -Phil
  • pedwardpedward Posts: 1,642
    edited 2011-11-21 19:21
    Magnetic deflection is bandwidth limited.
  • TorTor Posts: 2,010
    edited 2011-11-22 06:33
    We used to display video on oscilloscopes back in school for my electronics/TV repair education. Displaying video on the oscilloscope is something that naturally occurs to almost every student - the connection is so easy to make when you work with this stuff. So after a while you'll inevitably think "hm.. wouldn't it be possible to.." :)

    -Tor
  • ercoerco Posts: 20,259
    edited 2011-11-22 08:31
    Great! Since it's so easy, I want one of you whiz kids to come up with the bit-banging software app to turn my Parallax USB oscillioscope into a hi-def TV. :P
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