At 6:27 AM -0700 3/22/08, Jatinder Singh wrote:
>Hello All,
>I am new to recording nature/ bird sounds.
>I was recording birds at the edge of a large lake, and upon review
>of the recording I notice "pressure waves" in the recording. It was
>not windy during the recording. I am using ME66 microphone equipped
>with a sponge windscreen in association with a MZRH1 recorder, the
>whole contraption is hand held.
>Could anyone please educate me on these "pressure waves" and help me
>eliminate them in future.
>Thank you
>Jatinder
Hi Jatinder--
I can understand why the effect would sound puzzling. You can see in
this sonogram
http://ad2004.hku.nl/naturesound/Mahale_Fragment_Sonogram.jpg that
there are almost continuous very low frequency pulses (under 35 Hz).
It sounds and looks like light breeze interference to me.
In any case, I'd add some wind protection to your shock-mount and
then try some more recording. Foam doesn't do much to prevent wind
noise in my experience.
You could make a "basket" out of vinyl gutter cover and add fake fur.
Here are some projects with photos in order to get this basic
solution:
http://www.joelandkaren.com/mic-zeppelin/
http://www.mediumrecords.com/random/diy-ms-stereo-microphone-blimp/
http://www.jakeludington.com/project_studio/20060407_diy_microphone_zeppelin_windscreen.html
http://www.uwm.edu/~type/audio-reports/DIY_NT4_3inchPVC_ShockZep/DIY_NT4_3inchPVC_ShockZep.html
I think Rode and other manufacturers make furry "cat" wraps, but I'd
use something to create about 1" of:dead-air" space around the sides
and ends of the mic and then add the fur layer. Rob D.
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