On 01/10/2009, at 5:18 PM, Rob Danielson wrote:
> Hi Paul--
> Amazing birds and recording. You obviously knew where to set-up your
> rig!
>
> When fiddling with Izotope, I usually have a hard time judging how
> much noise reduction to use. Its appealing to lose all the hiss but
> the edge of the higher pitched sounds can become dulled and the space
> can feel less airy. I took your original snippet and played with EQ
> and made a comparison movie which may make what I'm trying to
> describe somewhat audible:
>
> QuickTime Movie 12mb uncompressed AIFF soundtrack
> https://pantherfile.uwm.edu/type/public/temporary/IzoTopeNoiseReductionVsEq_Lrg.mov
>
> QuickTime Movie 3mb compressed AAC soundtrack
> https://pantherfile.uwm.edu/type/public/temporary/IzoTopeNoiseReductionVsEq_AAC.mov
>
> There seems to be some stridency in some bandwidths during the louder
> calls that were possibly produced by the mp3 compression step.
> Addressing this with EQ would be either unnecessary or easier when
> working with the original. Rob D.
Apologies if this turns up on the list twice I suspect the spam filter
ate the original so I'm resending.
Hi Rob,
Thanks for making the comparison. I always find your approach to very
educational, and I try to follow the less is more method as far
possible.
I'd noticed when listening to the filtered recording that there seemed
to be a slight phasing effect in the wing beats. Looking at a
spectrograph display the is a slight but visible loss of detail in the
calls and wingbeats. I was using the plugin version in Wave Editor
so didn't have access to the spectrogram display for selecting the
training sample, so I'd expect to get better results using a licensed
copy of the standalone app.
I've put up a 15 second edit of the raw file that corresponds to the
section you used in the comparison. There is no post-processing of any
kind, so it might be a better basis for comparing?
http://www.urbanbirder.com.au/audio/download/241/RoundHill_edit_for_RD.wav
cheers
Paul
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