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Re: Wind Removal Software?

Subject: Re: Wind Removal Software?
From: Rob Danielson <>
Date: Thu, 9 Mar 2006 09:04:05 -0600
At 11:44 PM +0000 3/8/06, nbioacoustics wrote:
>Hi there,
>
>Does anyone know of a piece of software that is able to filter out
>wind or background noise from bioacoustic recordings?
>
>Thanks,
>Natalie :)
>

Hi Natalie--

"Wind or Background Noise" could include many phenomena, type of
sounds.  Looking at a waveform of your recording, you might notice
some pronounced, horizontally wide,  wave shapes. These may stem from
the wind moving the mic diaphragm physically. The ill affects of such
distortion cannot be removed, but sometimes they can be made less
noticeable by very low frequency filtering. Most waveform editing
software programs have "high pass" or "Low cut" filters that can
address just the lowest frequencies. There's usually no reason to
filter (cut) above 30Hz, but the pulses are often very high in
amplitude and your speakers may still create audible harmonic
artifacts of their presence. In this case, try applying several
filters--all below 30Hz. Another way is to measure the Hz, e.g. 6Hz
and apply very sharp parametric EQ. Wind can produce other problems
this will not address, of course. Rob D.



--
Rob Danielson
Film Department
University of Wisconsin-Milwaukee


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