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Re: Whole house audio


  • To: ukha_d@xxxxxxx
  • Subject: Re: Whole house audio
  • From: Nigel Orr <nigel.orr@xxxxxxx>
  • Date: Fri, 13 Nov 1998 08:50:55 +0000
  • Delivered-to: listsaver-egroups-ukha_d@xxxxxxx
  • Mailing-list: contact ukha_d-owner@xxxxxxx
  • Reply-to: ukha_d@xxxxxxx

At 21:25 12/11/98 -0000, you wrote:
perfect
>	as far as I can tell and that's over about 30m! Now I just need to
work
out a way of

I suspect that if you send broadband noise and look at the other end on a
spectrum analyser, you should see some drop-off at high frequencies.  Cat-5
is about 50pF/m, total 1.5nF for your run.  Assuming impedances of about 1k
ohm, the roll-off 3dB point would be over 100kHz, so the effect at audio
frequencies should be _very_ slight.

If however you had 10k output impedance on the sound-card (if you have the
manual it will probably tell you somewhere, everything comes down into the
audio band- that's why it's a better idea to send the signal at a lower
level, at lower impedance, either using decent hi-fi equipment or matching
circuits/transformers.

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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