[time-nuts] Using digital broadcast TV for timing?
david at endor.com
Wed Feb 8 04:41:59 UTC 2012
The DTV signal coding has a major problem in that it is not
deterministic - they can't even synchronize the audio and
video. There have been many workshops on this at the Audio
Engineering Society conventions. I doubt there is any useable timing in it.
At 09:01 PM 2/7/2012, Chris Albertson wrote:
>GPS requires a good view of the sky, Hard to do in say the 7th floor
>of a 40 story building if you have no windows. I'm wondering about
>using the new digital TV signals for timing.
>I'm pretty sure there is time code in the signal and I'm pretty sure
>the bits are clocked at a very accurate rate. Also TV receivers are
>very easy to find and put "hooks" into. I'd bet the broadcast TV
>signal could be almost as good as GPS.
>The plan is to try and phase lock a local oscillator and use a very
>long time constant on the loop filter. I bet the TV transmitters are
>locked to GPS and over a long enough time are as good as GPS. Also in
>many cities there are many TV transmitters, should be able to take
>advantage of that.
> Before I try some experiments anyone want to tell me why I'm wrong?
>Redondo Beach, California
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