Re: connecting PC to TV
- From: "Watson A.Name - \"Watt Sun, the Dark Remover\"" <NOSPAM@xxxxxxxxxxxxxx>
- Date: Sun, 31 Jul 2005 09:45:23 -0700
"Gerard Bok" <bok118@xxxxxxxxx> wrote in message
news:42ecaecd.787757@xxxxxxxxxxxxxxxxxxxxxx
> On Sat, 30 Jul 2005 16:17:29 -0700, "Watson A.Name - \"Watt Sun,
> the Dark Remover\"" <NOSPAM@xxxxxxxxxxxxxx> wrote:
>
> >"Gerard Bok" <bok118@xxxxxxxxx> wrote in message
> >news:42e4bc0d.6779856@xxxxxxxxxxxxxxxxxxxxxx
> >> On Mon, 25 Jul 2005 07:00:50 +0000 (UTC),
> >> techie@xxxxxxxxxxxxxxxxxxx (Bob Vaughan) wrote:
> >>
> >> >In article <42e3a399.4656982@xxxxxxxxxxxxxxxxxxx>,
> >> >Gerard Bok <bok118@xxxxxxxxx> wrote:
> >> >>On Sat, 23 Jul 2005 15:51:05 -0700, "Watson A.Name - \"Watt Sun,
> >> >>the Dark Remover\"" <NOSPAM@xxxxxxxxxxxxxx> wrote:
> >> >>
> >> >>>
> >> >>>"Ed Nielsen" <egnlsn@xxxxxxxxxxx> wrote in message
> >> >>>news:iPSdnX3hyvwk5X_fRVn-gw@xxxxxxxxxxxxxx
> >> >>>> Perkowski wrote:
> >> >>>> > JC wrote:
> >> >>>> >
> >> >>>> >> I have UTP cat 5 running all across my house.
> >> >>>> >>
> >> >>>> >> Now I would like to play movies on my pc and transer the
> >signal to my TV over a UTP-cable..
> >> >>>> >>
> >> >>>> >> Does anyone have any suggestions how I should be able to
> >manage that
> >> >>>> >> and what additional features are necessary to pull this off
?
> .
> >> >>>> > http://www.svideo.com/svideobalun1.html
> .
> >> >>>There is no need for coax for audio. Better without coax.
> .
> >> >The links previously given are for baluns designed for the
transport
> >> >of audio and video signals over category 5 twisted pair cabling.
> ...
> >> On audio frequencies and levels, a 'simple balun' requires a
> >> complete mu-metal encased transformer.
> >> Otherwise, just the transformers themself both would pick up as
> >> much noise as the twisted pair suppresses :-)
> >> And this arrangement would still suffer from rather huge losses,
> >> both in level and sound quality. My 2 cents :-)
> >
> >Obviously the proof that you're wrong is that thing you pick up and
talk
> >on every day, the telephone. It doesn't need mu metal shielding, and
> >the losses are not huge.
>
> But there is an important difference :-)
> Two actually. Your telephone system won't go far without power.
That's _was_ an important difference. The telephone system wouldn't go
far without power, back a hundred years ago when there were no
amplifying devices, such as transistors or tubes. Nowadays, with
self-powered telephones (cordless, or any phone that runs off a wall
wart), or modems, faxes, etc, there is no need for power, other than for
signaling the condition of the line. So, wrong again.
> And most --if not all-- telephone lines apply amplification.
> Both go missing in the passive balun system we were talking about
> :-)
That wasn't true a hundred years ago, and is becoming increasingly
unlikely nowadays, where the signal comes into the equipment and is
digitized by a codec. Again remember that most of the phone system was
designed a hundred years ago when there were no amplifiers, no tubes or
transistors.
> It is true that my assumption was wrong. But not for this reason.
> I was expecting a balun to transform the kilo-ohms audio signal
Generally, audio amplifiers have inputs that are in the kilohms, but
their outputs are usually much, much lower, in the hundreds of ohms.
They are usually capable of driving baluns that are, say, 600 ohms.
> into 110 ohms and back. Which, I still believe, would yield the
> results I feared.
> In practice, it is much simpler though. You don't need to match
> the cable characteristics, at least not for audio.
>
> >This is how the audio pros do
> >it, over a 600 ohm balanced line.
>
> Well, I know, I am learning every day :-)
>
> But I have yet to meet a professional audio installation that
> uses unshielded cable for it's 600 ohms balanced lines.
> (Although in the mean time I learned that even simply replacing
> coax with cat5 performs remarkably well.)
For line levels you don't need shielding, but for mic levels, it best to
have the shielding to protect against that RFI and ENI that might leak
into the signal.
> --
> Kind regards,
> Gerard Bok
.
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- From: Watson A.Name - \"Watt Sun, the Dark Remover\"
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