Re: [Phys-l] Digital TV signal delay

[Marty Weiss <martweiss@comcast.net>]

> Peter Lohstreter wrote:
>
> > Interesting discussion, but I'm not sure it explains an observation I
> made after I had digital cable installed. (FIOS..)
> > One evening, my wife turned on the TV in the den to the same  
> > station I
> was watching in my office (30 feet away...) and there was a
> > > > > > > noticeable delay - over a second- between the two signals.  Was
> one of my decoder boxes operating at a higher resolution and needing
> more> >decoding time?
>
> I have noticed the same phenomenon with both our previous Comcast  
> cable
> TV installation between the kitchen and family TV sets and our new  
> FIOS
> installation.  The kitchen and TV sets are on different branches of  
> the
> input cable feed and have different decoder boxes.  Could it be the
> delay in the different lengths of cable (RG-59) and splitters  
> involved?
> I don't have the delay of RG-59 cable handy.  Is there a noticeable
> delay introduced by a TV coax splitter (or amplifier)?

I would have believed this also, except in my house the delay occurs  
between the upstairs tv at the end of several splits through the  
expanse of attic (about 50 feet) and down through the closet to the  
tv, and the downstairs set with one split (on the outdoors wall)about  
25 feet on a straight line through the wall of the house from the  
original outdoor splitter;   the upstairs set is ahead of the  
downstairs by about 1 to 2 seconds.  The downstairs tv is connected to  
the digital box and the upstairs gets the feed directly off the cable  
from the street (no box).  So, is seems more likely that the delay is  
due to the processing in the digital box, rather than from splitters.

Marty
>