RE: Re: OT: Which AV Amp?

["Steve Morgan" <wormpurple@xxxxxxx>]

OK, Mr picky ;-)

The net effect, however, is that fed with an RGB signal from the
Digibox, the TV automatically selects RGB as the signal format.

The S-Video/Composite has to be toggled manually and there's nothing to
indicate, to HV perhaps, which format is selected. This is why I want
all the signals in the S-Video domain, so that there's no need to
toggle, even if that means some signal degradation from the VCR,
Homevision and Bush STB.

Actually, here's a thought - AV2 on the TV outputs the displayed TV
signal. If you fed the video out into the composite end of one of the
passive Composite <--> S-Video convertors (which is actually just a
filter), presumably, you'd get no chroma output if the signal was
S-Video (because there's no chroma information on the video out). If you
then fed the chroma signal to Homevision using one of the video sniffer
leads, do you reckon Homevision could detect the presence of chroma, and
hence be able to differentiate between Composite and S-Video?

It would be jolly useful if you could.

Steve

-----Original Message-----
From: Keith Doxey [mailto:lists.diyha@xxxxxxx]
Sent: 07 March 2002 13:44
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] Re: OT: Which AV Amp?


No it doesnt.

Pin 16 of the SCART tells the TV it is RGB.

There is no such functionality for S-Video switching unfortunately.

Many SCART leads will bleed enough of the composite signal onto the Luma
lead to give a colour picvture even though it *should* have been Black
&
White due to incorrect selection. Often though, the image will look like
the colour is slightly washed out and there may be moire patterning as
well. Switching to S-Video gives a crystal clear image.

Its a real pity that when S-Video was added to SCART they didnt adapt
the spec for Pin16 to signal S-Video. They changed the definiton of Pin
8 from a simple Internal/External signal to a tri-level signal
indicating Internal/Ext16:9/Ext 4:3

Keith