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Re: Feedback noise on Olympus LS-11

Subject: Re: Feedback noise on Olympus LS-11
From: "Scott Fraser" scottbfraser
Date: Mon Dec 30, 2013 9:48 am ((PST))
< I have been using my Olympus LS-11 with Sennheisser ME66 quite successful=
ly to record bird song over the past 3 years, however, during the past 12 m=
onths or so I have noticed some irritable feedback noise in most of my reco=
rdings, of varying degrees of loudness - it doesn't seem to be a problem wi=
th the mic, but a problem with the actual input socket - as an example, see=
 here: >

Certainly not feedback, it sounds like clock leakage into the preamp or ADC=
. A lot of budget recorders don't achieve adequate ground (earth) separatio=
n between their analog & digital sections & this kind of clock pollution re=
sults. Also, a number of people have experienced pollution of the audio fro=
m the LCD displays on certain units. If that noise is just a fact of life w=
ith that Olympus model you'll either want to upgrade to a cleaner recorder =
or perhaps try some gently applied noise reduction, such as iZotope RX. The=
 noise is absolutely steady state & any good noise reduction software shoul=
d have no trouble separating it from the desired ambience.

Scott Fraser

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