RE: Tivo SCART control...

["Paul Gordon" <paul_gordon@xxxxxxx>]

Thanks Keith,

An absolute fountain of information as ever!

Cheers.

Paul G.







>From: "Keith Doxey" <ukha@xxxxxxx>
>Reply-To: ukha_d@xxxxxxx
>To: <ukha_d@xxxxxxx>, <UKHA_TiVo@xxxxxxx>
>Subject: RE: [ukha_d] Tivo SCART control...
>Date: Wed, 5 Feb 2003 19:24:51 -0000
>
>Hi Paul,
>
>Late reply as usual due to not being able to read email until the
evening
>:-(
>
>As others have said, TiVo is doing what it should do. All TV that you
watch
>should be through Tivo so that it learns what you watch. This means it
>needs
>to take Pin 8 of the SCART high so that it grabs the TV. When TiVo is
on
>Standby it will still record and you can also start it recording
something
>then switch it off and it will continue to record.
>
>Your problems are specifically down to the TV and its implementation
of
>SCART switching. Below is an extract from a document I downloaded
from
>somewhere...
>
><QUOTE>
>2.1.1.3 A TV must never prevent a channel/source change if pin 8 and/or
pin
>16 on the currently viewed SCART input is asserted.
>
>Reasoning: Some STBs, DVDs, etc. will leave pin 8 (and pin 16 if RGB
>signals
>are in use) asserted all the time that they are powered. If the user
wishes
>to change to an internal TV preset or another SCART input without
powering
>down the currently active peripheral, the TV must respond to this
request -
>it must not "lock" the user to the currently viewed SCART
input.
></QUOTE>
>
>SCART switching can be level triggered or edge triggered. Level
triggered
>will activate any time the pin is high, edge triggered only takes
effect
>when the pin rises from low to high.
>
>Having said that, here are my experiences.
>
>Philips TV circa 1987 - Single SCART - Active SCART stole the TV with
no 
>way
>to get back to the Tuner
>
>Goldstar TV circa 1993 - Single SCART - Active SCART stole the TV and
also
>disabled the internal tuner removing its signals from the
"Out" pins of the
>SCART, unable to select internal sources.
>
>Mitsubishi AV1 circa 1995 - Twin SCART - Active SCART grabs the TV but
you
>can manually select a TV channel and that will be displayed. AV1
takes
>priority over AV2 so if both SCARTS are active, AV1 will be displayed.
You
>can manually select AV2 though. A real annoyance is that if you have
an
>active SCART on AV2 and choose to override it with a TV channel all is
well
>unless you then get an active AV1 such as a VCR. Press play on the VCR
and
>it grabs AV1 as you want, but when you stop the VCR and AV1 goes
low,
>instead of dropping back to the TV you were watching, it then senses
that
>AV2 is still high and displays that despite the fact you had
previously
>overridden it.
>
>The function of SCART switching is determined by the designer of
the
>equipment and sometimes they dont always make the best decisions. My
>Pioneer
>CD player in the car is a classic example. Some of the buttons are
dual
>function, short press does one thing, long press does another. The
"Source"
>button cycles through "OFF/Tuner" or "OFF/CD/Tuner"
depending upon whether
>there is a CD in the slot. If I have a CD playing and eject it, the
unit
>goes OFF, however if I switch to Tuner first I can eject the CD and
the
>Tuner stays on. Inserting a CD at any time will go straight into play
mode.
>The way I would have designed it would be for a short press to
change
>between CD/Tuner and a long press to turn it off. I would also make it
drop
>back to Tuner when a CD was ejected just as all Radio/Cassette players
I
>have ever had have done.
>
>I think that more modern TV sets are probably better thought out as
people
>now have more external equipment connected to TV's than they used to
but no
>doubt the more demanding consumers such as inhabit UKHA will find
more
>shortcomings than Joe Public :-)
>
>Keith
>


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