|
None
for audio or composite video but if you use it for S-Video, Component or
RGB
Video the leads must all be EXACTLY the same length (within a few
millimetres)
Electricity travels at 186000 miles per second and
takes a finite time to reach the other end of the cable, if you are using
S-Video and the two cables are different lengths then the brightness and
colour
information will arrive at slightly different times. The effect of this
will be
that the colour will be either to the left or right of the image detail
like a
badly printed newspaper.
With
RGB, the colours will arrive at different times and you will get fringing
as if
the monitor was out of convergence giving the following effect with a white
object assuming the blue is delayed (exagerated for
clarity)
Should
be
Will
get Extreme
case
WWWWW
YWWWWB YYYYY
BBBBB
WWWWW
YWWWWB YYYYY
BBBBB
WWWWW
YWWWWB YYYYY
BBBBB
WWWWW
YWWWWB YYYYY
BBBBB
giving
a yellow fringe to the left and a blue fringe to the
right
I
have
seen this on a LCD projector when one of the cores in a multicore went
faulty
and they ran a seperate but longer cable for the red. As a quick workround
I
swapped a couple of leads over so the RGB signals were the same length but
the
Sync was longer. That shifts the whole image sideways but the colours still
line
up.
Hope
that helps
Keith
-----Original
Message-----
From:
steve [mailto:steve@xxxxxxx]
Sent: 24 October 2001
18:35
To: ukha_d@xxxxxxxSubject: Re: [ukha_d]
Comfort Wiring
What are the cons against just using mutiple
single way ?
----- Original Message -----
Sent: Wednesday, October 24, 2001 6:23
PM
Subject: RE: [ukha_d] Comfort
Wiring
Both 4 and 5 way video cable exists already and is available from
Maplins at about that price...
I
have an 8m length of 5 way that I used to connect my video scaler to my
projector...
Phil
Anybody seen the new wiring scheme proposed by comfort. They
say sending video over cat5 is too expensive (they don't mention
KAT5), and are suggesting the manufacture of a 4 way coax with an
estimated cost of £3.80 per metre! Seems like a very expensive
and inflexible solution. Alan Shields alan@xxxxxxx
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