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Re: Weird noise when changing to mono?
To: CRTech <crtech@crtech.org>
Subject: Re: Weird noise when changing to mono?
From: John Stortz <ka4flx@gmail.com>
Date: Thu, 8 Jun 2017 10:10:11 -0400
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In-reply-to: <a45102c2-ae52-a8d1-66b7-98a57a8dd61f@therockradio.org>
References: <a45102c2-ae52-a8d1-66b7-98a57a8dd61f@therockradio.org>
I do only short recordings, so record every original file as .WAV & am not editing portions to mono, so my situation isn't quite the same, but am using a Behrringer  UFO202 box to digitize the audio.

There seemed to be a similar noise & whine, which I eventually traced to some kind of flukey ground issue. My equipment is on two different power branch circuits & there appears to be a very slight difference in ground voltages between the two circuits. I solved the problem with a power cord with THREE male plugs all connected together. It looks dangerous, but only the ground pins are connected. NOTHING connected to HOT or NEUTRAL pins.
Once built, I plugged one plug into each of the two circuit outlets & the third plug goes into the outlet of the local battery backup unit. No more noise. 

This is a home studio. An inspector would have a panic if they found this patch cord with three male plugs.

John S.

*Politics is the gentle art of getting votes from the poor and campaign funds from the rich, by promising to protect each from the other.
*~Oscar Ameringer~

On Thu, Jun 8, 2017 at 8:40 AM, Dalan Decker <programming@therockradio.org> wrote:

Hey all,

Weird issue here.  I use a rack-mounted PC running Ubuntu and the built-in Audio Recorder (via a cheap Behringer external sound card that accepts RCA input from the distribution amp and outputs to the microphone input on the PC via the standard microphone input).  It's been working fine for over two years to record at certain times for archiving.  It records MP3 in stereo then I convert to mono wav to edit, then back to MP3, using dBPowerAmp or Audition.  Lately though, when I convert it adds a ton of noise and whine.  The noise happens at the conversion to mono, not at the time of converting back to MP3. Any ideas?

Dalan E. Decker, Programming Director
The Rock Radio Network
WBMJ (AM-1190) San Juan Metro
WIVV (AM-1370) Vieques / Virgin Islands
WCGB (AM-1060) Juana Díaz / Ponce

References: Weird noise when changing to mono?
(Dalan Decker <programming@therockradio.org>, 8 Jun 2017 12:41:08 -0000)
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