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#11
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WTF with my computer clock?
In article ,
"Arfa Daily" wrote: If you are the telephone company, or a television broadcaster, though, things really do work a lot better when the digital signals carried by your network all are at precisely the same bitrate, no matter where they come from. Right. At one time TV stations etc had their own accurate pulse generator referenced to the national standard. Here in the UK it was IIRC from the National Physics Laboratory. Dave Plowman London SW To e-mail, change noise into sound. I reckon that TV companies must now use these laptops with very rough RTCs ! Have you noticed that now programme material is not networked from one region into some or all of the others, and adverts are no longer 'local', there is not any need for accurate cueing points around the network, so advertised starting times are not even nodded at ? I checked the starting times of about half a dozen programmes tonight, using the teletext clock, which I believe to be accurate, and not a single one started within 1 minute of the correct time, and a couple of them were off by several minutes. That's not the place where television needs precise time; it involves the generation and dissemination of NTSC or PAL in the past, or MPEG multiplexes in the present, not the *content* carried by those signals. There's pretty good reason to suspect that broadcasters purposely offset the starting times of their programs precisely to make it less desirable for you to change channels during the interval -- if you can never watch both the end of one program and the beginning of another, you're less likely to do it. Note that a lot of contemporary shows start directly with some dialog and action, while the title and intro follow on a bit later. You miss the first few seconds, you lose. Same with the ends of shows. Isaac |
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