Posted by Jan Panteltje on 10/11/06 13:49

On a sunny day (Wed, 11 Oct 2006 13:56:36 +0100) it happened Roderick Stewart
<escapetime@removethisbit.beeb.net> wrote in
<jnppi2pogr3hsr8v7126ij7igpm1bv6efi@4ax.com>:

>On Wed, 11 Oct 2006 11:42:48 GMT, Jan Panteltje
><pNaonStpealmtje@yahoo.com> wrote:
>
>>There are a few basic differences between UV and IQ, here it is described
>>rather well:
>> http://en.wikipedia.org/wiki/YIQ
>>In NTSC the vectors are rotated 33 degrees.
>>As for representation of where all the colors are relative to R-Y and B-Y see
>>the 'vectorscope':
>> ftp://panteltje.com/pub/vectorscope.gif.
>
>Maybe I didn't explain very well, but the point I was trying to make
>is that R-Y and B-Y are the same for all three systems, and colours
>should appear in the same places on a vectorscope for all of them.
>Although NTSC is officially *encoded* with different bandwidths along
>a pair of axes at 33deg wrt the R-Y and B-Y axes, it is perfectly
>possible to *decode* along any axes, including R-Y and B-Y, just as
>for PAL (which doesn't use the different bandwidth trick).
>
>Strictly speaking an NTSC decoder should have it's demodulator phases
>aligned with the I and Q axes, and the resultant signals matrixed to
>produce R-Y and B-Y, but it is quite common for the phases to be
>aligned with the R-Y and B-Y axes. You don't get the advantage of
>extra chroma bandwidth in one of the signals (can't remember which
>one), but it works and most people can't tell the difference.
>
>Rod.

OK, yes, IIRC the Sony actually had 3 demodulators, one for R, one for G,
and one for B ;-) (KV2000 chassis?)
I remember looking at that diagram for a long time wondering??????
No matrix!!
And it could do PAL, came with hue control to rotate the phase...
(Was looking for a KV2000 diagram to look it up, not for free on the net it
seems).

It is marketing that sells, no matter how awful the product.
For example ... (space for flames later) people are buying widescreen LCD
while CRT still has a better picture.... mpeg mp4 movies that are unsharp
at anthing that moves... 'because you cannot see it' well I DO see it....
mp3 compression because you cannot hear those faint sounds in a strong one,
well I CAN hear them... But one day we have enough space to record
uncompressed...
http://editcam.ikegami.com/index.php/news_article/C2/inphase_oem_relationship/
will have better displays
http://www.novalux.com/
have foveon camera sensors without Bayer pattern
http://www.sd9.org.uk/sensors.htm

etc etc

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