il.com
Date: Sat May 17, 2014 9:04 am ((PDT))
Thanks much David. That sounds very interesting! The prices are affordabl=
e for those too. I will have to check out some videos of these in use as =
i look into it more.
Otherwise, I have been interested in the EchoMeterTouch that plugs into an =
iPad or phone etc. for viewing and listening abilities. Any ideas about th=
is product?--I don't believe it has been out long. (http://www.wildlifeac=
oustics.com/products/echo-meter-touch) .
Chad
On 2014-05-17, at 9:14 AM, [naturerecordists] wrote:
> > Went to an interesting research talk this week on acoustics "caterpilla=
rs talk, butterflies listen" by Jayne Yack. While many moths can hear, only=
a few butterflies can. It was once believed that butterflies could not hea=
r and they were/are used as a symbol by some deaf communities. The moths ar=
e able to hear the calls of bats.
>
> Chad,
>
> When I got involved in bat conservation, I discovered the new world of
> ultrasound. Normally we are not aware of this but even a cheap heterodyne=
> bat detector opens up this whole new soundscape. First off you often find=
> ultrasonic crickets interfering with the bat calls and also hear the high=
> harmonics many songbirds produce in their calls.
>
> Ciel make a stereo heterodyne detector which is a bit awkward to use but =
it
> gives interesting results. I am currently studying horseshoe bats which p=
eep
> rather than click (CF calls as opposed to FM) and they warble when flying=
> due to the Doppler shifts which are exaggerated by the heterodyne frequen=
cy
> shift.
>
> For more info look at Wikipedia "Bat detector" (which I expanded some tim=
e
> ago) for the different types.
>
> David Brinicombe
>
>
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