time delays on dab vs analogue
 

In article ,
Mark Carver wrote:
Scott wrote:


I believe R4 long wave is recognised as the most accurate time signal.

Depends how far away you are from Droitwich, and more significantly, how
far your ear is away from the speaker cone !

it used to be "received back at BH".

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time delays on dab vs analogue
 

In article ,
Mark Carver wrote:
Woody wrote:

Indeed I suspect they may actually do that as there is
distribution delays on the FM system as well.

Remind me again, what does the 'I' in NICAM stand for ?


but the N stands for "Near"

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time delays on dab vs analogue
 

In article ,
David WE Roberts wrote:
If you just incorporate the DAB time delay into all the scheduling then
the whole thing is broadcast about six seconds early, including the
program changeover and pips.

Fine if you're broadcasting solely on DAB - but very few do. And do any of
those use the pips?

The only thing you will have to do is to have a 'DAB time' clock for
anything with a studio (or other venue) audience so they don't get too
confused.

--
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Dave Plowman London SW
To e-mail, change noise into sound.

time delays on dab vs analogue
 

On Tue, 20 Oct 2009 23:31:30 +0100, Mark Carver wrote:

Depends how far away you are from Droitwich

Does that also affect the thousands of people listening in these areas?

Aberdeen ...... 1449 kHz
Bromley ........ 720 kHz
Carlisle ...... 1495 kHz
Derry .......... 720 kHz
Enniskillen .... 774 kHz
Glasgow ........ 720 kHz
Plymouth ....... 774 kHz
Redruth ........ 756 kHz
Tyneside ....... 603 kHz

Radio 4 UK, not just on LF, but MF too.

time delays on dab vs analogue
 

"Dave Plowman (News)" wrote in message
...
In article ,
Bill Wright wrote:

"Dave Plowman (News)" wrote in message
...
In article ,
comp.john wrote:
When the time signal arrives, which is the accurate one. DAB or
analogue?

Rather obviously the earliest one - as you can delay something, but not
make it happen before it does, as it were. If you could, you've just
invented time travel.

No, clever clogs, that's ********. The BBC could play the pips early so
as to make them more-or-less right for DAB. In theory . . .

And go across the end of the preceding prog? Or to avoid this you'd need a
long gap between live progs. And of course the pips are usually in between
live spots.

Not a theory you've thought through, Bill. ;-)

I have, I have! I reckon it would not be beyond the wit of the BBC to play
the preceding programme early as well. All they need to do is alter the
clocks at Broadcasting House so they are a few seconds in front of the rest
of us.

Bill

time delays on dab vs analogue
 

"charles" wrote in message
...
In article ,
Max Demian wrote:
"Norman Wells" wrote in message
...
Max Demian wrote:
Sounds rather digital to me, if it matters.

Does anyone know how the analogue clocks adjust when the clocks go back?
Do they buzz backwards, or just stop for an hour?

As a young child in hospital I watched the ward clock adjust itself at a
rapid rate. I can't remember why it did this, but years later I learnt that
all the clocks in the hosputal were controlled and powered by electrical
pulses, and could all be adjusted together.

Bill

time delays on dab vs analogue
 

wrote in message ...
Brian Gaff wrote:

Just remember, if the sun goes out, you will not know for 8 minutes.

Not really true if you know your relativity theory. :-)

But true for the rest of us.

Bill

time delays on dab vs analogue
 

"Woody" wrote in message
...
"Bill Wright" wrote in message
...
The real problem Bill is that different DAB radios take different times to
decode - in fact we have one that takes longer in the kitchen where the
signal is not so good (occasional bubbling mud) than it does when in a
front bedroom and gets a better signal (compared against an off-air
clock.) Must be that when the decoding is working harder it takes longer?

If I set up a row of DTT boxes or DSAT boxes in the workshop and put them
all on the same channel the audio will be different from all of them, even
if they're the same make.

Bill

time delays on dab vs analogue
 

"Max Demian" wrote in message
...
"Bill Wright" wrote in message
...

"Dave Plowman (News)" wrote in message
...
In article ,
comp.john wrote:
When the time signal arrives, which is the accurate one. DAB or
analogue?

Rather obviously the earliest one - as you can delay something, but not
make it happen before it does, as it were. If you could, you've just
invented time travel.

No, clever clogs, that's ********. The BBC could play the pips early so
as to make them more-or-less right for DAB. In theory . . .

How can they play them before they are sent from Herstmonceux?

Easy. Record the ones sent for the previous hour and play them back.

Bill

time delays on dab vs analogue
 

In article , Mark Carver wrote:
Remind me again, what does the 'I' in NICAM stand for ?


but the N stands for "Near"

Yes, well, Near enough :-)

I did conduct an experiment once when Holme Moss became receivable in
Hampshire during a lift. I tuned one radio to Rowridge, the other to
Holme Moss. I could not hear any time delay.

I suspect that most of the delays associated with digital processing
actually result from the extreme bit-rate reduction that many of them
now use, rather than the process of converting the signal from analogue
to digital in the first place.

Rod.
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