ultrasonics to get a dog to shut up?
Warren Burstein
dogs don't like and so when it's turned on they'll stop barking. Is
this really so? Anyone have any idea how to make one? Do they cause
the dog pain or is it just an annoying noise to them? Will the dog
actually get the message or just bark louder? That's what it does in
response to anything else that it doesn't like.
Could a microphone be connected to a "bark filter" to trigger one?
How would one distinguish between barking and other street noise?
P.S. I would not dream of using one without the consent of the owner
of the dog.
thanks
--
/|/-\/-\
|__/__/_/
|warren@
/ nysernet.org
Mr K.C. Chan
[ much stuff deleted - see subject line ]
The recent April/May issues of Silicon Chip (Australia) have just what you need.
(Doesn't help though, if you own a dog yourself and want to silence the
mongrel across the fence.)
John Robinson
> I've heard that there are ultrasonic devices that make a noise that
> dogs don't like and so when it's turned on they'll stop barking. Is
> this really so? Anyone have any idea how to make one? Do they cause
> the dog pain or is it just an annoying noise to them? Will the dog
> actually get the message or just bark louder? That's what it does in
> response to anything else that it doesn't like.
>
> Could a microphone be connected to a "bark filter" to trigger one?
> How would one distinguish between barking and other street noise?
This is a subject dear to my heart - my neighbour has a noisy dog and
I've been conducting experiments with ultrasound to try and silence it
for the past two years.
The current hardware is basically an oscillator/amplifier delivering a
lot (24v p-p) of 20kHz to a pair of piezo-electric horn tweeters,
mounted under the gutter of my house and aimed at the offending
animal's territory. A microphone in the loft is connected to an
amplifier, filter, envelope detector and some logic, and triggers a
burst of about 7 seconds of ultrasound. It distinguishes barks from
shorter or longer/continuous noises by means of a cunning set of
monostables. The whole thing is battery powered (for safety - I don't
like leaving home-made mains-driven kit running continuously). It's
gained the quaint nickname of "dog off" :-)
Does it work?
Well, it's hard to say. On several occasions I've increased the
output level and it's undoubtedly made a difference, but the dog then
seems to get used to it after a few days and it becomes less
effective. I think now it's at a level that deters the animal from
barking for no reason (which it used to do quite a lot) but of course
it's impossible to know what would have happened without the
deterrent.
The project continues. I'd love to hear from anyone else who's done
similar experiments. In particular, what frequency is most effective
- I chose 20kHz because it's inaudible to people and low enough to
avoid needing megavolts to drive a capacitive load.
>
> P.S. I would not dream of using one without the consent of the owner
> of the dog.
This dog annoys me to the point of distraction (the owner refuses
to accept there is any problem) so I have no regrets about annoying
the dog in a similar way :-)
John
+---------------------------------------+-----------------------------+
| John Robinson, Senior Systems Analyst | JANET: |
| King's College, University of London | J.Rob...@uk.ac.kcl.cc.oak |
+---------------------------------------+-----------------------------+
Joern Yngve Dahl-Stamnes
A dog can hear frequencies higher that 20 kHz so you could try to
increase the frequency. Also try to increase the output level even more.
Sooner or later the sound will be that high that the dog will find it
annoying and painfull. Then perhaps it will stop barking.
BTW, I wonder if someone have tried such a device on late-night
opera-singing cats?
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+--+-+-+-+-+-+-+-+
* I went back to my mother, * Joern Yngve Dahl-Stamnes *
* I said, "I'm crazy ma, help me!" * University of Trondheim *
* She said, "I know how it feels son, * The Norwegian Institute of Tech. *
* 'cause it runs in the family." * Division of Physical Electronics *
* - The Who, Quadrophenia * e-mail: da...@fhydra.dnet.unit.no *
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+--+-+-+-+-+-+-+-+
Jason LaBranch
>The project continues. I'd love to hear from anyone else who's done
>similar experiments. In particular, what frequency is most effective
>- I chose 20kHz because it's inaudible to people and low enough to
>avoid needing megavolts to drive a capacitive load.
I've not done experiements but my dog gets very wierd when
I play two out-of-key notes. Why not try two high frequency
sounds with their frequencies shifted slightly.
--
Jason LaBranch | To find your way, Look within!
labr...@netcom.com | -- Road Atlas
Richard Snider
>In article <26...@itexjct.jct.ac.il>, war...@itexjct.jct.ac.il (Warren Burstein) writes:
>> I've heard that there are ultrasonic devices that make a noise that
>> dogs don't like and so when it's turned on they'll stop barking. Is
>> this really so? Anyone have any idea how to make one? Do they cause
>> the dog pain or is it just an annoying noise to them? Will the dog
>> actually get the message or just bark louder? That's what it does in
>> response to anything else that it doesn't like.
>>
>> Could a microphone be connected to a "bark filter" to trigger one?
>> How would one distinguish between barking and other street noise?
>
>mounted under the gutter of my house and aimed at the offending
>animal's territory. A microphone in the loft is connected to an
>amplifier, filter, envelope detector and some logic, and triggers a
>burst of about 7 seconds of ultrasound. It distinguishes barks from
>shorter or longer/continuous noises by means of a cunning set of
>monostables. The whole thing is battery powered (for safety - I don't
>like leaving home-made mains-driven kit running continuously). It's
>gained the quaint nickname of "dog off" :-)
>
>Does it work?
>
>Well, it's hard to say. On several occasions I've increased the
>output level and it's undoubtedly made a difference, but the dog then
>seems to get used to it after a few days and it becomes less
>effective. I think now it's at a level that deters the animal from
>barking for no reason (which it used to do quite a lot) but of course
>it's impossible to know what would have happened without the
>deterrent.
>
>The project continues. I'd love to hear from anyone else who's done
>similar experiments. In particular, what frequency is most effective
>- I chose 20kHz because it's inaudible to people and low enough to
>avoid needing megavolts to drive a capacitive load.
>
I had a freind who had a bunch of "poodlles" as a neighbour. They
would keep him up for large portions of the evening without his
permission. He designed a "siren" type circuit that would range from
about 17 KHz to 25 Khz.... The dog would bark constantly when it
was operated. He called the local dog catcher, who is responsible for
ceaselessly barking dogs, and told them about the neighbour. The
dog vanished/got-real-quiet about 2 days later.... Perhaps you want
the active type solution...... :-)....
....Rich
rsn...@xrtll.uucp
WCOM07 for those who know.
Thomas Chung
Sorry to post on this subject, but i think it is on the line of the similar
area.
My next door neightbor has a cat keeps coming to our garden and drive way
and use it as its toilet. There are some chemical in the market, helps to
drive them away (or at least stop them dumping). But the rain wash them
away. Is there any utrasonics device/design can be used to dry cats and dogs
away ? I hope to use it in a short range, so that it won't drive other cats
away from their owner.
Please advice.
Thank you
Thomas
--
============================================================================
= Thomas Chung || Satellite Reception Centre =
= esy...@uk.ac.cov.cck || Coventry University, UK =
============================================================================
Steven Murray
>>> I've heard that there are ultrasonic devices that make a noise that
>>> dogs don't like and so when it's turned on they'll stop barking. Is
>>> this really so? Anyone have any idea how to make one?
A hobby magazine over here in Australia recently carried a construction
article for a 'Woofer Stopper' as they called it, performing this task.
I can't vouch for it ofcourse, but I would say that within a couple of
months there will be several hundred Australian hobbyists who will have
strong opinions one way or another!!
The magazine: 'Silicon Chip, P O Box 139, Collaroy Beach, NSW 2097,
Australia'
Back issues $6 Australia, plus $1 for overseas post.
They take credit cards if you phone (2) 979 5644
I have no association with the above magazine, other as an occasional
reader...
--
Steven Murray ste...@kralizec.zeta.org.au
AirBorn Electronics
PO Box 538, Lane Cove, The paper burns, but the words fly away.
NSW 2066, Australia. - Ben Joseph Akiba