On 3/5/07, Dieter <[EMAIL PROTECTED]> wrote:
> If the granularity of our control of the signal is 330Mhz,
Ouch, that's a bit of a limitation. I don't suppose the two heads
could be interlaced together somehow to get 660 Mhz?
Ok, what we can probably do is use a fixed 330MHz and then, in the
amplifier, delay green by 1/3 and blue by 2/3 of a clock period
relative to red and then just add them together. That gives us
effectively 990MHz. Good enough? Actually, it's not quite that
simple, but since everything is a smooth curve, I think we can fake
it.
(Still low, but
better than 330.) And we lose half of that to Nyquest?
That loss is elsewhere in the problem, I think. That is, we would get
the same loss whether we used analog or digital to encode the signal.
> can we
> encode all of the information in the TV signal? Would the steps
> between digital levels (1024 of them) be too noisy? Could we fix that
> with a low-pass filter?
Does 1024 levels imply a S/N of 30.103 dB? If so, that would be plenty
for ATSC, but IIRC a bit low for good quality NTSC. I haven't seen numbers
for PAL, SECAM, or DVB-T.
Tying the three channels together effectively triples that.
--
Timothy Normand Miller
http://www.cse.ohio-state.edu/~millerti
Favorite book: The Design of Everyday Things, Donald A. Norman, ISBN
0-465-06710-7
_______________________________________________
Open-graphics mailing list
[email protected]
http://lists.duskglow.com/mailman/listinfo/open-graphics
List service provided by Duskglow Consulting, LLC (www.duskglow.com)
