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Re: Surround Sound Recording - bats

Subject: Re: Surround Sound Recording - bats
From: "Dan Dugan" dandugan_1999
Date: Sat Jan 3, 2015 10:44 am ((PST))
>> There are bats and insects up there, so if the mics can do it, it's scie=
ntifically helpful to record wider bandwidth than humans can hear.
>
> Dan,
>
> I'm into bats and they are a whole new world. 96Khz divided by 2 is a bit=

> low for many bat calls

one octave at a time...and every octave doubles the file size. I'm seeing a=
 lot more at 96K than I did at 44.1. The reduction of the Sound Devices pre=
-record buffer from 10 seconds to 5 seconds at 96K is a major hit. My main =
four mics are Sennheiser 8020s that are rated (not flat) to 60K. See respon=
se curve on page 9:

http://en-us.sennheiser.com/global-downloads/file/838/MKH8020_US.pdf

But inside the Rykote ball-gags, probably not so good.

> and you have to bring the frequency down anyway to
> hear them.

Pro Tools has a convenient key combination shift-spacebar to play at 1/2 sp=
eed.

> Among my bat detectors, I have a Ciel CDP102 dual bat detector
> which can work in stereo. It is a heterodyne detector which does an
> arithmetic frequency downshift with a digital frequency display.

Very nice!

> Warning - you can get hooked on bat calls if you get enthusiastic. :-) Yo=
u
> can also discover ultrasonic insects and HF calls from small mammals and=

> birds.

> See:
> http://en.wikipedia.org/wiki/Bat_detector#Heterodyne
> and
> http://en.wikipedia.org/wiki/Bat_species_identification
>
> David Brinicombe

Thanks, Dan





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