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Date:	Tue, 28 Jul 2015 14:54:06 -0400
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Subject:	Re: [geda-help] Strategy of adding netname attributes in gSchem?
From:	"Evan Foss (evanfoss AT gmail DOT com) [via geda-help AT delorie DOT com]" <geda-help AT delorie DOT com>
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On Tue, Jul 28, 2015 at 2:10 PM, Csányi Pál (csanyipal AT gmail DOT com) [via
geda-help AT delorie DOT com] <geda-help AT delorie DOT com> wrote:
> 2015-07-28 17:55 GMT+02:00 Evan Foss (evanfoss AT gmail DOT com) [via
> geda-help AT delorie DOT com] <geda-help AT delorie DOT com>:
>> On Tue, Jul 28, 2015 at 11:42 AM, Csányi Pál (csanyipal AT gmail DOT com)
>> [via geda-help AT delorie DOT com] <geda-help AT delorie DOT com> wrote:
>>> 2015-07-28 16:41 GMT+02:00 Evan Foss (evanfoss AT gmail DOT com) [via
>>> geda-help AT delorie DOT com] <geda-help AT delorie DOT com>:
>>>> I don't mean to stomp on your dreams but there is an ethical concern
>>>> here. You are very likely to harm bats. 60KHz is the centre of here
>>>> hearing frequency.
>
> https://en.wikipedia.org/wiki/Bat_detector
>
> From the abowe link I quoted this here:
> "Bats emit calls from about 12 kHz to 160 kHz, but the upper
> frequencies in this range are rapidly absorbed in air."

They emit a number of call yes. Some of them are used to locate,
others are used to focus, yet others are for acoustically stunning
their prey. Ultimately they use their wings to cup the bug, the video
is impressive. These are not monotones but chirps of various
compositions and intensities. They don't have to listen for
reflections from all of them. I am not an expert on this but I have
been around them for 6 years and at this point I think I can say it
would not be good for them. Much of that time spent making things to
help study noise induced hearing loss. This is going to sound very
arrogant but I am pretty sure I know more about it than you do.

Irrespective of how the bats make sound their hearing has a curvature
to it. The point on the curve for a healthy bat is around 60KHz. There
are obviously variances but the point is if we introduced a single
tone noise source into your environment and just left it running you
would not like it ether. A similar problem exists for marine life
because of our adding noise to their environment. Not all hearing loss
is caused by the raw power of the exposure. A lot (if not most) is
"noise induced hearing loss" meaning that it was just having added
sound in the background that over time caused damage. This is one of
the ways people develop tinnitus.

60KHz is highly directional. Your one buzzer is going to mostly
radiate a narrow cone that I assume will move around with you.

> So one can say that that any ultrasonic mosquito repellent can to harm
> bats, right?

I am not saying it is impossible to make this work safely for bats. I
am just saying that you need more understanding of this than just
reading on wikipedia about the sounds bats generate.

> --
> Regards from Pál
>



-- 
Home
http://evanfoss.googlepages.com/
Work
http://forge.abcd.harvard.edu/gf/project/epl_engineering/wiki/

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