Which way up is digital transmitted?

On Thu, 29 Jun 2006 09:21:30 +0100, Chris
wrote:

On Wed, 28 Jun 2006 20:03:12 +0100, mb21 wrote:

It's transmitted with the 1s on the crests of the wave, and the 0s in
the troughs. This is ok if you are close to the transmitter, where
there will tend to be less slippage of 1s down the waveslope. The
further away you are, the more likely the 1s will have fallen into the
troughs and cancelled out the 0s, when this happens, it causes the
picture to freeze.

"JPG" wrote in message
...
On Thu, 29 Jun 2006 09:21:30 +0100, Chris
wrote:

On Wed, 28 Jun 2006 20:03:12 +0100, mb21 wrote:

It's transmitted with the 1s on the crests of the wave, and the 0s in
the troughs. This is ok if you are close to the transmitter, where
there will tend to be less slippage of 1s down the waveslope. The
further away you are, the more likely the 1s will have fallen into the
troughs and cancelled out the 0s, when this happens, it causes the
picture to freeze.


Thanks for that. It's much clearer in my head now.

Bill

"Bill Wright" wrote in message
...

"JPG" wrote in message
...
On Thu, 29 Jun 2006 09:21:30 +0100, Chris
wrote:

On Wed, 28 Jun 2006 20:03:12 +0100, mb21 wrote:

It's transmitted with the 1s on the crests of the wave, and the 0s in
the troughs. This is ok if you are close to the transmitter, where
there will tend to be less slippage of 1s down the waveslope. The
further away you are, the more likely the 1s will have fallen into the
troughs and cancelled out the 0s, when this happens, it causes the
picture to freeze.

Thanks for that. It's much clearer in my head now.

Bill

I'm surprised that the French don't have upside pictures on DTT. It would
protect the French digital TV market by making it necessary to use a French
DTT box, or else you'd have to turn your TV set upside down. Actually they
should also make the picture negative, or better still make the Y and Pr
components negative, but not Pb, (a bit like their analogue system L) and
then call it "Digital SECAM" (or possibly SECAM-N for secam numerique, not
to be confused with a possible analogue colour system for Argentina).

In article ,
Stephen wrote:
I'm surprised that the French don't have upside pictures on DTT. It
would protect the French digital TV market by making it necessary to use
a French DTT box, or else you'd have to turn your TV set upside down.

Ah. So that's what's wrong with my Sagem STB. ;-)

--
*Eat well, stay fit, die anyway

Dave Plowman London SW
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