[time-nuts] Time/freq from digital TV
magnus at rubidium.dyndns.org
Sun Jun 14 11:31:39 UTC 2009
Alan Melia skrev:
> This may not relate to the USA but a couple of years back I had an
> interesting chat with a BBC engineer at an NPL Time and Frequency gathering
> at Teddington. His comment was along the lines of....."....well there is as
> you realise not need to sync lines and frames nationally now because all the
> network content travels digitally even though we have only just started a
> phased change-over. The frames and line syncs broadcast will be probably
> derived from a "good clock" but it will not be a single traceable unit as it
> was. There is no telling how good the clock is, though it will probably be
> better than absolutely necesary.
Actually, this is still far from the thinking I have heard from other
sources. They essentially want everything traceable to TAI/UTC.
Digital doesn't help, it makes it more acute actually.
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