Bill R, you wrote,
>Muir Woods has pretty diverse bat fauna. Several have most of their call
>energy near the nominal upper bound for audio microphones (say 16-25 kHz).
>Small condensers could have decent sensitivity above 20 kHz, but that
>typically isn't shown in the factory specs for anything other than (expensive)
>measurement microphones.
>
>Larger bat detector condenser microphones are often optimized for 40 KHz and
>above with sensitivity falling fairly steeply in the upper audio. They also
>typically have subjectively high noise floors and may be quite humidity
>sensitive.
>
>Depending a number of things (notably antialiasing filters),
>combining the high sampling rate A to Ds of the 722 (or other lesser digital
>recorders) with a relatively inexpensive low noise floor broad band
>microphone, could offer more recordists affordable access to numerous animal
>sounds that formerly required expensive, bulky special purpose gear. There
>are a lot of nocturnal insect signals in this range as well.
>
>Any impression of the noise/sensitivity of the AT3032 above 20 kHz?
I've only examined the 3032 at 44.1 sampling rate, but it looks like
it's going strong at 20K. Sound Devices publishes the response of
their preamps hidden somewhere on their web site, but I can't find it
today. As I recall they're good to at least 50K.
Next time I have access to a 722 I'll try a night recording at high
sampling rate with 3032s, and slow it down with SoundHack or
something. Thanks for the idea.
-Dan Dugan
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