"Dickie Mint" wrote in message
...
Not seen any mention in these hallowed walls.


Visited the son in Sheffield Wednesday & Thursday. Saw a strange fault
where the sound would suddenly go way out of lip sync on HD channels.
Sometimes many seconds. I saw it on his new Sharp Freeview HD telly, but
he says it happens on another one in the bedroom and others have mentioned
seeing it to.

Its fairly normal for freeview - we'll eventually get used to it just like
Americans who move here eventually get used to 50Hz flicker.

Woody wrote:

Sorry Bill, wrong use of expression.

What I meant is that if there is an incoming ghost then
attenuating the incoming signal may reduce the ghost enough that
it does not upset the decoder.
The attenuator will reduce the wanted and unwanted signals by the same
amount, so the ratio between the two will stay the same.

As you rightly say you can get a perfectly good picture from a
relatively weak signal provided the quality is good. If the
incoming quality is suffering for any reason then attenuating the
signal - assuming there is enough present - may remove whatever
is offending and leave a better quality signal which needs less
processing.
It won't remove whatever is offending.

Unwanted signals do not 'disappear below the noise' when attenuated;
they merely add to the noise.

If what you said was right we would have been able to remove ghosting by
the use of attenuators. That was not the case. We would also be able to
improve the BER of DVB-T when there is co-channel interference by the
use of attenuators. Again, that is not the case.

Seriously, and I don't want to be rude, but are you having a laugh?

Bill

On 13/11/2011 22:58, Glyn Morgan wrote:

snip ...

Apologies for such a long explanation, which I hope makes sense. I also
ought to point out that I have not been involved in this for over three
years since I retired in 2008 .

Glyn

Thanks, Glyn, nice to hear from you!!
I've not only been retired for over 6 years now, but I never grasped the
more complex bits in the first place! And thank you for putting up with
me at the time.

PL is looking into it, as several people have reported it on different
transmitters, and with different sets, in case it is maybe a source problem.

Richard