time delays on dab vs analogue
 

In article , Ian Jackson wrote:
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.

But is the delay constant? I've always thought that it depended on the
amount of processing and multiplexing going on at any instant (ie on the
content of audio signals being stuffed together).

It can be made constant if we want it to be, simply by specifying the delay
time and padding all delays in receivers to match the longest path, just
like we used to do with TV sync pulses.

I'd suggest ten seconds as a practical and memorable amount. Those
manufacturers who chose to make their receivers time-accurate would no
doubt make it a selling point, and for the others, it wouldn't matter.

Rod.
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time delays on dab vs analogue
 

On Tue, 20 Oct 2009 20:58:09 +0100, Scott wrote:

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

Not DCF77 or MSF or WWV or CHU ?

time delays on dab vs analogue
 

On Tue, 20 Oct 2009 20:05:52 +0000 (UTC), J G Miller
wrote:

On Tue, 20 Oct 2009 20:58:09 +0100, Scott wrote:

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

Not DCF77 or MSF or WWV or CHU ?

Fair point. What I meant to say was the most accurate audible time
signal comprising a set of six pips received using normal domestic
radio receivers.

time delays on dab vs analogue
 

"Dave Plowman (News)" wrote in message
...
In article ,
Max Demian wrote:
Not *everything* digital is slow.

Digital radio mics put an audible delay in the audio compared to an
analogue one and I'd guess they tried their best to minimise this.

That doesn't mean that radio controlled clocks need to be delayed.

--
Max Demian

time delays on dab vs analogue
 

Dave Plowman (News) wrote:
In article ,
Max Demian wrote:
Not *everything* digital is slow.

Digital radio mics put an audible delay in the audio compared to an
analogue one and I'd guess they tried their best to minimise this.

That's OK, because COFDM video links for radio cams also introduce a
similar delay for the vision :-)


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Mark
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time delays on dab vs analogue
 

"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?

--
Max Demian

time delays on dab vs analogue
 

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 !


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time delays on dab vs analogue
 

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 ?


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Mark
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time delays on dab vs analogue
 

In article ,
Max Demian wrote:
"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?

because they haven't "been sent from Herstmonseaux" for at least 20 years.
The 'pips' come from a generator in BH. I'm sure it could be adjusted to
be a few seconds early - or even 14 minutes and 53 seconds late.

--
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time delays on dab vs analogue
 

charles wrote:
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"

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.

--
Mark
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