Wheel Weaves Colors Together for Television (Aug, 1946)

Wheel Weaves Colors Together for Television

COLOR television for which the Columbia Broadcasting: System has gone to bat began last winter with transmission of movies; direct transmission of street scenes by means of a live color television camera is promised this summer.

Actually, persons gathered around a Columbia ultra-high-frequency television receiver are seeing an extremely rapid series of one-color pictures—first red, then blue, then green. The pictures are seen through a rapidly revolving color filter, which is mounted in front of the set’s viewing tube, and the persistence of vision within the watcher’s eyes causes the images to appear in their natural colors.

The color television image is produced by modulating a 10-megacycle video band, wider than in prewar tests (PSM, July ’41, p. 65), and is composed of 525 lines of red, 525 lines of blue, and 525 lines of green. They are transmitted in that order, but a complete three-color frame is received in 1/20 of a second.

Whatever the color television camera picks up is reproduced in exactly the same way. If a black and white newsreel were to follow a studio program in color it would not be necessary to change the dial setting on the receiver.

4 comments
  1. Casandro says: July 17, 200711:42 am

    Oh sequencial colour television. This has been tried with film, too. The problem is that the colours flicker and it’s not compatible with monocrome sets.

  2. fluffy says: July 17, 20076:17 pm

    Way ahead of its time – this is how DLP projection works.

  3. avatar28 says: July 18, 20072:26 am

    I thought the exact same thing when I saw the article, fluffy. Except my 52″ DLP HDTV does it just a wee-bit better. Betcha the guys writing this article would never have thought the “japs” could produce anything like that.
    :-)

  4. jayessell says: July 18, 20079:19 am

    The Apollo TV cameras used this to reduce the weight and bandwidth requirements.
    (See Apollo 13)
    The signal was converted to NTSC on the ground.

    Rapid movement produces color artifacts.

    That would be a nice effect in a music video or SciFi show.

    (Never saw it myself, but supposedly the motion picture “West Side Story” used an optical effect that de-synchronised the colors in one of the musical numbers.
    Maria’s dress?)

    PS: LSD does this too.
    So I’ve been told.

Submit comment

You must be logged in to post a comment.