Re: [Phys-l] Digital TV signal delay

[E Muehleisen <ironmill@hotmail.com>]

We are on satellite feed. Two channels carry the same program with one digital and the other analog. When I switch from analog to digital there is a one second delay. If I switch from digital to analog I lose a second. Same box, same LCD but a i second discrepancy +/- depending on the direction of the switch.

Too much of a good thing is wonderful!

> From: clement@hal-pc.org
> To: phys-l@carnot.physics.buffalo.edu
> Date: Tue, 23 Sep 2008 12:52:55 -0500
> Subject: Re: [Phys-l] Digital TV signal delay
>
> If the boxes are the same, are they really the same?  If the serial numbers
> are far apart there may have been a design change.
>
> Beyond this are the TVs being fed from the same spigots?  In other words is
> one being fed HDMI and the other one a composite signal?  There should be no
> difference between S-video and composite, but HDMI or component outputs may
> be different.  Is one set digital, and the other analog?  These are some of
> the relevant questions that might bear on the question.
>
> Or there is the possibility at one converter box may be defective.  I had
> that problem with HD radio, and the defective box introduced a huge delay.
>
> John M. Clement
> Houston, TX
>
> > Forum for Physics Educators <phys-l@carnot.physics.buffalo.edu> writes:
> > > You state that you had a digital cable installed. Is a digital box
> > > connected to all your television sets? In Rhode Island, two services
> > > come into the house simultaneously, one requires a digital decoder box
> > > at each television and the other is a non-HD service that can be fed to
> > > many sets using a splitter. There is considerable delay between the two
> > > that produces the effect that you mention. I assume that the HD requires
> > > the more sophisticated decompression and hence a longer delay.
> >
> > Our service provider is ahead of the curve for switching over to digital.
> > We no longer receive analog signals.  The decoder boxes are identical and
> > the coax runs are practically the same.  (Maybe 3-4 meters different.)
> > I wish I had noticed the effect before the switch to pure digital so I
> > could compare the effect once the switchover occured.  I may have to drag
> > out the old o'scope and take a look...  Wonder how much error that's going
> > to put in the system?
>
>
> _______________________________________________
> Forum for Physics Educators
> Phys-l@carnot.physics.buffalo.edu
> https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l

_________________________________________________________________
Stay up to date on your PC, the Web, and your mobile phone with Windows Live.
http://clk.atdmt.com/MRT/go/msnnkwxp1020093185mrt/direct/01/