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Re: Feedback noise on Olympus LS-11

Subject: Re: Feedback noise on Olympus LS-11
From: madl74
Date: Mon Dec 30, 2013 5:02 pm ((PST))


I can't hear any "feedback noise" but the record level is far too high
making the limiter bounce the levels down and up. Listening critically on
the peaks, there is a bit of digital crunching on the overloaded bits as
well as background pumping.

The acoustic background noise levels vary from a start of -30 dropping at
05secs to -40 and to -43 at 15secs. At 36 secs, the background level goes u=
again taking the next call into limiting.

Digital noise is in the lowest 2-3 bits out of 15 (plus parity bit) and is=

therefore at -12 times 6dbs or -72dB. This means that you could under-recor=
by peaking low, say to -20dB and so avoiding overload/limiter effects while=

still not adding recorder noise. You can adjust levels on playback but you=

can't undo limiter artifacts. Listening to the HF frequencies only, there i=
also considerable enharmonic distortion (modulation distortion) on the main=


The joy od digital is the wide dynamic range, so there is no need to push
levels up while recording as with tape.

I also tried my favourite noise reduction settings on it and it destroyed
the natural ambience of the recording which is good.

David Brinicombe

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