Re: Microphone and Pre-amplifier question



MRW wrote:

On May 24, 4:57 pm, Eeyore <rabbitsfriendsandrelati...@xxxxxxxxxxx>
wrote:
Your biggest problem at 30 feet is going to be localising the sound source. For that
you need high directional sensitivity and the way to do that seems to be the 'shotgun
microphone' that does clever acoustic things to achieve the result. I wonder if you
could build your own ?

http://en.wikipedia.org/wiki/Image:Shotgun_microphone.jpg

Shucks. I thought this project was as simple as using an electret mic.
I guess not. I haven't looked into shotgun microphones, yet. However,
when my dad was shopping one for his camera, it was worth about $80
and looked pretty bulky.

I wonder what kind of mic my bluetooth headset uses. Every time I use
it in an area with a higher background noise level, the people on the
other line complain that they can hear the background.

I'm sure it'll be similar to the other one. You might be surprised how loud 'background
noise' can be.

I nearly forgot the parabolic reflector. Somewhat large but has the advantage that it also
amplifies the SPL at the mic.
http://www.bio.umass.edu/biology/kunkel/gjk/microphone.htm
http://www.canford.co.uk/blueprintonline/blueprintaug2003/bigears.aspx

Graham

.

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