In article , Mike Barnes scribeth thus
Well as best I remember it is a bit round the houses, but for most purposes its good enough. I reckon that if anyone needs that accurate a time source then they'd have done that by either Anthorn and or GPS...
remember its not the digitisation per se that introduces delays, its the compression.
a typical A->D->trasnission path>D->A is only going to delay two sampling periods plus transmission delay.at 16Khz that 125 us IIRC..so nothing specatular there
Its when you have to store many frames to perform compression, that digital delays creep in.
Let's face it, CD quality is 2 channels x 16 bits times 44Khz or summat which is 1.4Mbps...I doubt whether a standard DAB stream is much over
128Kbps if that. Oh I looked it up. 128k or 192k for radio 3.So 100:1 compression. that takes some CPU and some buffering!
Working in what field?
Which are all still present. Including the odd police car,etc.
The only time it's a recording is if the programme itself is recorded.
I still have a CRT monitor, and see no reason to replace it until it fails. If I run it at 1024 x 768 x 75Hz all the MSF clocks in the vicinity fail to receive any data, so in practice I run it at 85 Hz.
If the LCD monitor is fed from a conventional analogue VGA output then you can be certain something internally is running at the line- timebase frequency, since that's the rate of the line-sync pulses on the interface. Whether it's a high-power signal likely to radiate significantly (which it would be in the case of a CRT) is another matter.
Richard.
In article , The Natural Philosopher writes
The switching PSU is probably the highest emitter of RFI in an LCD - anything between 50kHz to 1MHz depending on design.
But LCDs are far better shielded than CRTs ever were.
As they say its not that simple AFAIR its distributed by the BBC RAMAN digital ring system let alone any coding and decoding delays in the DAB process which can be several seconds whilst the audio leaves the station concerned and then goes off to the MUX'ing point then out to the transmitters;!..
Radio 3 is a "luxury" DAB station several now are off to Mono at even as low as 64K!...
Mind you UK DAB is a crap out of date already system..
Its rather like 286 tech these days..
Mark presented the following explanation :
Just how did you arrive at that conclusion? The script is already written and tested for you, you only need save it as a file with a memorable name on your drive and run it just the once to adjust how frequently you want your PC's clock to be synced. Really it could not be easier.
Dave Plowman (News) laid this down on his screen :
He was in engineering.
Richard Russell expressed precisely :
Hello Richard, long time no speak :-)
You are correct it carries parity bits only, I have just checked.
I would imagine the data received is pretty useless without checking the parity bits match. Must admit I have never seen any such time errors in any of my clocks, apart from when there has been a failure to sync.
Mike Tomlinson pretended :
Closely followed by the screen illumination inverter.
Agreed! The only CRT remaining here is in my 'scope.
Are you sure they aren't of DCF77? That would make more sense.
directional antenna and a certain amount of electronics. See also Tempest proof - it worked alarmingly well.
Regards, Martin Brown
In article , Harry Bloomfield writes
Yes, I forgot about that, thanks. Mind you, LED-illuminated monitors are starting to become more common, which removes the need for an inverter.
I worked out that a lower power consumption LCD would pay for itself in saved power in less than 2 years, not give me a headache with flicker and not expose me to strong magnetic UV or low energy gamma radiation, and wouldnt go wonky with a pair of puodspeakers each side.
It was as they say a no brainer, especially as it liberated a few more inches of precious desktpop.
Almost certainly not, and again I am not sure that VGA is that common these days - though I still use it.
Nor is 1024x768x75hz
Mine is 1600x1050x50hz.
so a notional 'scan' rate of 52.5KHz.
With LCD scan rate is not a big issue, since the memory in the display 'holds' the last frame ..until the next one comes along
hard to do magnetic shielding and a huge part of that 60Khz line scan was magnetic.
well penny pincher that I am I still have a couple of Sony TVS with STBs around, but computers went LCD 5 years+ ago.
Which means he may not be that familiar with operations.
In article , The Natural Philosopher writes
I worked in monitor repair for years. Some professional displays - typically larger ones used in CAD, etc. had absolutely epic amounts of shielding. A real pain in the arse to disassemble to get at the works.
Dave Plowman (News) pretended :
Possibly, but he is deceased now.
In article , Dave Plowman (News) scribeth thus
They don't have engineers anymore now in broadcasting like they used to;(...
Indeed. And the bloody fields STILL leaked out.
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