Re: TV and sound over CAT5

[Nigel Orr <nigel.orr@xxxxxxx>]

At 10:26 27/07/99 +0100, you wrote:
>Keith I am a bit of a novice in this department, please explain more
about
>balanced audio.

I know I'm not Keith, but if you can look back a few messages, I basically
explained how balanced signalling gets rid of noise- you can think of it
simply as the signal going down one wire, and an inverted copy of the
signal going down another wire.  If the wires are near enough each other,
and the source of noise not too close, the noise will appear as equal
'spikes' on both wires.  At the receiving end, if you subtract the inverted
copy from the original, you will get 2 x signal and 0 x noise.

>output from a sound card to my amp ? what cable should be used ? is
there a
>detectable loss in quality ? over what distance ?

Use any twisted pair cable, (you can use cat-5 if it's there, or just buy
some microphone cable (it's screened as well) if you only need audio on the
one run).  Quality should be fine.  This is used in pro audio for _long_
runs (eg a mic on 1 mile of cable) and is how telephones are wired too
(though the quality requirement is lower!).

Keith may know of a suitable balanced line driver/receiver product for home
use, or you can use an audio transformer for each channel at each end to do
the balancing/unbalancing.

Nigel
--
Nigel Orr                  Research Associate   O   ______
Underwater Acoustics Group,              o / o    \_/(
Dept of Electrical and Electronic Engineering     (_   <   _ (
University of Newcastle Upon Tyne             \______/ \(

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