[Phys-L] Re: TV delay

[Bernard Cleyet <anngeorg@PACBELL.NET>]

The signal from my favo FM stn. (from the people's republic of Berkeley)
is  sometimes so weak I resort to DSL streaming.  My dsl service is so
bad I have selected the maximum buffer size.  If the off "air" and off
dsl are simultaneously audible it drives Gate Keeper crazy.  The
difference is v.~ ten seconds.  So it's possible the difference could be
due to buffering.  However, not v. likely.

Our cable service is also very bad.  The better PBS TV stn. (San Jose)
has a nearby repeater (Watsonville).  Sometimes when the cable has
failed, if not due to the repeater's failure, we watch it upstairs where
an antenna receives it well.  When I think of it I'll check to see if
there's a noticeable delay.

You're all familiar w/ ghosts for checking sub millisecond delay?

bc

Brian Whatcott wrote:
> At 11:18 AM 6/7/2005, Laurent H., you wrote:
>
> > My wife fairly frequently asks me about something she observed, and I can
> > often start my explanation with "It's just simple physics . . . "
> >
> > The other day she asked me about something that sounded absurd, that I
> > didn't think she was observing properly, but to my surprise, she was correct!
> >
> > We have a TV upstairs in our family room and another downstairs in our
> > bedroom.  Our house is open enough that it is possible in some parts to
> > hear both TVs at the same time.  Why, she asked me, are all the stations
> > broadcasting simultaneously on both sets except for one, our local PBS
> > station (Channel 11), which lags by a very noticeable second or so on one
> > of the TVs?
> >
> > I didn't think this could be true, but it was.  Has anyone else ever
> > noticed anything like this?  Let's hear your theory before I say anything
> > more.
>
>
>
> NPR stations use network feeds and they use local repeaters.
> Sometimes you will find two versions of NPR material on
>   closely adjacent channels (89.9 & 90.1 in my case)
> A given station may include a delay loop if there is live material
> to be interspersed.
>
>    I take it that PBS TV may be similarly arranged.
> So for me, the question would be: are two TVs really using the same signal?
> It would be unusual to find an audio  delay source inside a TV
>   (to say the least!)
>
> But (reaching...) could one TV be recording to VCR
>   and replaying in-line?
>
>
> Brian Whatcott    Altus OK    Eureka!
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