Re: RGB Card Question

[bieling@terra.es]

Michael J. Mahon wrote:
> Jorge ChB wrote:
> > Michael J. Mahon <mjmahon@aol.com> wrote:
> >
> >
> >>>>>I'd suspect that the colour burst being absent in the middle
> >>>>>of a frame would produce pretty bizzarre results.
> >>>
> >>>
> >>>Like for example ?
> >>>I ran the program above and nothing "bizarre" came on the screen.
> >>
> >>I didn't say something bizarre *would* happen, only that it *could*
> >>happen, because it is completely outside the NTSC specification.
> >
> >
> > Yep, the most "bizarre" thing that could happen is a switch from color
> > to monochrome, or viceversa...
>
> No--actually, loss of color sync could result in some "rainbow"
> displays for part of a frame as the monitor color reference
> oscillator tries to get back into phase lock.
>
> The "trajectory" of phase lock during reacquisition can be
> chaotic, so, with the "right" timing, wierdness can happen.
>
> Some monitors may incorporate circuitry to detect solid phase
> lock of the reference and disable chroma processing until it
> is achieved, but I'd be surprised to find this in non-professional
> monitors.

So you think that 8 cycles is not enough to achieve phase lock ?
Then how does it phase lock if there are *just* 8 cycles in the color
burst ?
You think that it takes several lines/bursts to achieve phase lock ?
Because if not, it really doesn't matter how much "chaotic" the
phaselock is, as long as it has completed by the end of the color
burst...