Connect with us

I want to flip a composite signal...

Discussion in 'Electronic Repair' started by [email protected], Feb 17, 2008.

Scroll to continue with content
  1. Guest

    Is there an easy way to flip a composite signal so it displays upside
    down? Is there perhaps a commercial gadget that does such a thing?
  2. Why not just reverse the leads to the vertical deflection coil?
  3. James Sweet

    James Sweet Guest

    You'd have to digitize it a frame at a time, flip it in memory and then send
    it out to a DAC. It's far from trivial.

  4. Yes, and it's called a mirror.

    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
  5. Norman Webb

    Norman Webb Guest

    William Sommerwerck wrote in message ...
    Is this the solution to reversing camera's.

    I am using a cheap security video monitor as a rear view behind a caravan
    but the picture is reversed. ie LHS is on RHS of screen.
    If I swap the horizontal deflection leads this should work?

  6. Norman Webb

    Norman Webb Guest

    Unfortunately due to the magic of science, a mirror only swaps left to
    right, it doesn't swap top to bottom

  7. Yep it should.

  8. James Sweet

    James Sweet Guest

    Yes, that's exactly what you want to do. Swap the vertical and you get
    upside down, swap the horizontal and you get mirror image. Make sure you
    don't mix horizontal with vertical.
  9. Arfa Daily

    Arfa Daily Guest

    As others have said, reversing the scan coils is the way it's done. Many
    commercial surveillance monitors in the CRT days, had separate and
    reversible plugs for the field and line deflection coils, just so that you
    could mount a camera either on a top mount or a hanging mount. I've also
    seen the ability to reverse the scan in the camera itself. Been a while
    since I've been involved, so I don't know what the situation is now with LCD
    monitors. I guess that a camera with the ability to reverse its output is
    still ok, and also, the last controllers that I worked with were full of
    fancy features, and actually had the frame stores that James was talking
    about, but I can't recall now whether reversing the picture was one such

  10. He probably wants to view in a mirror.

    --- sam | Sci.Electronics.Repair FAQ:
    Repair | Main Table of Contents:
    +Lasers | Sam's Laser FAQ:
    | Mirror Sites:

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name AND either lasers or electronics is included in the
    subject line. Or, you can contact me via the Feedback Form in the FAQs.
  11. PeterD

    PeterD Guest

    If it is a CRT monitor, yes that will work.
  12. Smitty Two

    Smitty Two Guest

    WRT LCD monitors, many of them used to come with menu options to
    manipulate the picture, including flipping it horizontally. (mirror
    image) Lately, it seems that most if not all manufacturers have dropped
    those options. Many (but not all) of the Sharp Aquos line had that
    feature until recently, but they've begun to discontinue it as well. We
    use that feature to build 3-D vision systems, and the growing shortage
    of compatible monitors is of concern. The OP could likely find a used
    LCD monitor that would meet his requirements.
  13. hr(bob)

    hr(bob) Guest

    You can also put a mirror in front of the camera, for either
    horizontal or vertical inversion.
  14. Well here's an interesting question.. What happens if you switch the
    verticle and the horizontal. Will it change your picture orientation or will
    it fail to start up. Just curious about ways to change the orientation for
    old Arcade games that had the monitors mounted vertically. Just curious if
    I could flip the entire picture vertically so that I can use a PC in my
    arcade cabinet. i.e. Turn your computer monitor on its side and have the
    picture correct.

  15. James Sweet

    James Sweet Guest

    It will blow out the horizontal output transistor, and probably fry the
    vertical output as well. The two coils have dramatically different impedance
    since the horizontal scan coil is part of a resonant circuit also used to
    generate the high voltage and other voltages used in the monitor..

    Vertical monitor games were coded to display right with the monitor on it's
    side. The scan still sweeps across the long dimension of the tube. MAME has
    a setting to rotate the picture so you can use a standard PC monitor on its
    side, or you can display the game on a horizontal monitor with black bars on
    either side of the vertical picture. Google MAME cabinets, hundreds of
    people have built these already.

  16. B&W or color CRT monitor? It will work with B&W, but will need more
    work to modify a color CRT monitor. LCD will need to be digitized and
    mirrored in software, in real time.

    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida

  17. Then you need two mirrors, or turn the monitor upside down. ;-)

    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
  18. James Sweet

    James Sweet Guest

    It makes no difference whether it's B&W or color. I've done a lot of service
    work on arcade game monitors, and it's common to have to flip yoke plugs.
    Some games mount vertical monitors on one side, some on the other side, some
    horizontal monitors are mounted upside down, there's really no standard.
    Flip the wires and the picture flips, that's all there is to it. One place I
    worked I used to swap the yoke wires in people's tvs as a prank.

    Many small LCD monitors have a switch to toggle mirroring.
  19. Thanks for the pointer on MAME. I'm allready using it that way, but it would
    be nice to be able to do everything without having to look at it sideways..
    I can already play games oriented properly, but using dos is a bit of a
    challenge at times.
    I kind of guessed that it wouldn't work because of the scan rate differences
    between the two, horizontal being in the kilohertz range and vertical just
    being around 60 hertz or so.

Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day