Audio filters

[Davidk]

Made a muffler for the camcorder mics, basically a plastic water bottle top about 12mm high (happened to have a 25mm diameter that fitted over both mics), cut out the top so it was open but still had a lip to retain the foam, and solid circular side. Filled it with A/C dust filter foam about 10mm thick - the nearest open type 'weave' foam I could find that looked like the sort of mufflers you see on boom mics. Modified the rim a bit so it fitted over the camcorder snugly and held it in place with some thin (1mm?) black hat elastic threaded thru some small holes drilled in the side for the purpose (3 points) and stretched back over/under the camcorder body.

Test results on the same scene on a windy gusty day
- no muffler - same result as described in the post: wind noise especially the low frequency flutter loud, would drown out most other sounds.
- muffler 1 layer of foam - significant improvement, but wind noise still there, just lower volume and would not drown other sounds.
- muffler 2 layers of foam (both layers crushed down fit into the same mounting space) - better again. Wind noise is still noticeable, but the level is roughly the same as a very muted background. Normal volume of a camera operator doing commentary quite clear, yet the background is just enough to make it clear there was some wind.

This seems to be a fairly optimal config for outdoors on a windy day.

Thanks to everyone for their help.

Davidk