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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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