That doesn't sound like an AC line problem. If you had an AC line problem
you would hear a 60 or 120 HZ hum. it wouldn't be high pitched.
It may be noisy circuitry in your mixer, coupled with a cabling problem,
such as poor shielding or an impedance mismatch.
----- Original Message -----
From: "John Chilelli" <j...@neo.rr.com>
To: "PC Audio Discussion List" <pc-audio@pc-audio.org>
Sent: Tuesday, September 10, 2013 5:48 PM
Subject: AC line filter question
Hi all,
I am experiencing some sort of high pitch line noise in my recordings. I
am using an Allen - Heath mixing board with a usb interface into my
Windows 7 computer using Audacity 2.0.4. I was told that I should look
into an AC line adapter, but I'm afraid that the entire electrical system
for tha room I am using is on one circut, including overhead lights and
fans. I wish to be able to get rid of this line noise that exists even
with the overhead fan off. Can anyone make a good suggestion as to what I
should do for this problem?
Thanks,
John
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