Comments by "Lawrence D’Oliveiro" (@lawrencedoliveiro9104) on "Compatible Color: The Ultimate Three-For-One Special" video.

  1. 6:36 Probably good to mention by this point that “I” stood for “in-phase” and “Q” for “quadrature”. That is, these were the 0° and 90° components extracted from the phase-modulated chrominance signal. If you think of this signal as a point moving in two dimensions, the direction of the point from the centre gives you the hue, and the distance from the centre is the saturation of the colour.
    192
  2. 6:53 Actually you’ve got it upside down; higher signal levels correspond to lower luminance levels (darker), while lower levels are higher (lighter). It was done this way so that transients caused by interference would random dark dots instead of random light dots, and the former were considered to be less noticeable.
    99
  3. →C64 C64 There was no “time delay” in PAL. It solved the colour problem in a very simple and elegant way, which is why it became the world’s most popular broadcast colour TV system.
    4
  4. You are confusing the spec with implementations of the spec. Quoth Wikipedia <https://en.wikipedia.org/wiki/PAL>: “Early PAL receivers relied on the human eye to do that cancelling; however, this resulted in a comb-like effect known as Hanover bars on larger phase errors. Thus, most receivers now use a chrominance analog delay line, which stores the received colour information on each line of display; an average of the colour information from the previous line and the current line is then used to drive the picture tube. The effect is that phase errors result in saturation changes, which are less objectionable than the equivalent hue changes of NTSC.”
    4
  5. 8:09 Actually the inverse matrix to that applied at the broadcast end.
    1