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out of curiosity, what happens when people are exposed to loud
supersonic sounds for awhile?

for instance, let's say you turned your soundblaster speakers way up
and emitted a 35 kHz wave for awhile. what then?

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Scott Dorsey
 
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wrote:
out of curiosity, what happens when people are exposed to loud
supersonic sounds for awhile?

for instance, let's say you turned your soundblaster speakers way up
and emitted a 35 kHz wave for awhile. what then?


Your cats and dogs would be annoyed and you'd blow your tweeters.
The sound would not affect you particularly. After all, hospital
ultrasound systems use levels far higher than you could produce in
free air.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
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oh, i had an ultrasonic bug repeller. didn't work.

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David Morgan \(MAMS\)
 
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wrote in message ups.com...

oh, i had an ultrasonic bug repeller. didn't work.



How do you know that it was loud enough ?


;-)





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Scott Dorsey
 
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In article . com,
wrote:
oh, i had an ultrasonic bug repeller. didn't work.


A lot of switching power supplies (and the cheap ones in PCs are the
worst) put out a huge amount of trash in the 50-100 KHz range acoustically.
Since nobody can hear it, manufacturers don't much worry about it.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
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Bob Cain
 
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Carey Carlan wrote:

Drive away all the roaches in the house? My mom has a box that purports to
do just that. Looks like a cheap tweeter. Claims to emit 35K tones (what
a coincidence). Don't know if it drives away pests or not.


Sure does. I was recently overrun suddenly by aggressive, acrobatic
rodents, large and small, and two of these devices in the kitchen, aimed
at right angles, crossing in the center completely solved the problem.


Bob
--

"Things should be described as simply as possible, but no simpler."

A. Einstein
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hmmm.. i had a mouse, and he did disappear after i put in an
ultrasonic device.

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Michael Wozniak
 
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wrote in message
oups.com...
hmmm.. i had a mouse, and he did disappear after i put in an
ultrasonic device.

I had roaches, but they went away after I fed them tones recorded with an
AKG C1000s thru an old mackie preamp and sent thru an Alesis 3630 to NS10
tweeters...



Mikey
Nova Music Productions


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Joe Kesselman
 
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I had roaches, but they went away after I fed them tones recorded with an
AKG C1000s thru an old mackie preamp and sent thru an Alesis 3630 to NS10
tweeters...


Music critics are sometimes indistinguishable from roaches... grin/

My cat had definite opinions about music. Some recordings she clearly
liked listening to -- she'd sometimes lie down where she could stare at
(and presumably focus those mobile ears on) the speakers -- and some she
apparently disliked. I never established a pattern, unfortunately; next
time I have a cat in the house, I'll have to watch more carefully.


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Arny Krueger
 
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"Scott Dorsey" wrote in message

In article
. com,
wrote:
oh, i had an ultrasonic bug repeller. didn't work.


A lot of switching power supplies (and the cheap ones in
PCs are the worst) put out a huge amount of trash in the
50-100 KHz range acoustically. Since nobody can hear it,
manufacturers don't much worry about it. --scott


Ditto for LCD displays.


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she likes tones that dont scare off mice

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Dirk Bruere at Neopax
 
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Steve wrote:

Scott Dorsey wrote:

wrote:

out of curiosity, what happens when people are exposed to loud
supersonic sounds for awhile?

for instance, let's say you turned your soundblaster speakers way up
and emitted a 35 kHz wave for awhile. what then?


Your cats and dogs would be annoyed and you'd blow your tweeters.
The sound would not affect you particularly. After all, hospital
ultrasound systems use levels far higher than you could produce in
free air.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."



I knew a guy who found 40kHz unbearable.
We were working on an ultrasonic movement detector.
He would complain of pain and pressure in his ears any time it was on.


When there are reflections eg in a room, then when the head is moved there are
Doppler shifts. This results in interference and some quite weird auditory
experiences.

--
Dirk

The Consensus:-
The political party for the new millenium
http://www.theconsensus.org
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i heard of this ultrasonic device that makes people sick and barf.
anyone know about this?

Dirk Bruere at Neopax wrote:
Steve wrote:

Scott Dorsey wrote:

wrote:

out of curiosity, what happens when people are exposed to loud
supersonic sounds for awhile?

for instance, let's say you turned your soundblaster speakers way up
and emitted a 35 kHz wave for awhile. what then?

Your cats and dogs would be annoyed and you'd blow your tweeters.
The sound would not affect you particularly. After all, hospital
ultrasound systems use levels far higher than you could produce in
free air.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."



I knew a guy who found 40kHz unbearable.
We were working on an ultrasonic movement detector.
He would complain of pain and pressure in his ears any time it was on.


When there are reflections eg in a room, then when the head is moved there are
Doppler shifts. This results in interference and some quite weird auditory
experiences.

--
Dirk

The Consensus:-
The political party for the new millenium
http://www.theconsensus.org


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Scott Dorsey
 
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wrote:
i heard of this ultrasonic device that makes people sick and barf.
anyone know about this?


Other way. You're thinking of infrasound. Most folks have some frequency
usually in the 7-10 Hz range that will cause their abdominal cavity to
resonate. Very weird feeling.

Although there have been some sounds in the audible range that might make
one sick as well... Flora Foster-Jenkins comes to mind....
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."


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Arny Krueger
 
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"Arny Krueger" wrote in message

"Scott Dorsey" wrote in message

In article
. com,
wrote:
oh, i had an ultrasonic bug repeller. didn't work.


A lot of switching power supplies (and the cheap ones in
PCs are the worst) put out a huge amount of trash in the
50-100 KHz range acoustically. Since nobody can hear it,
manufacturers don't much worry about it. --scott


Ditto for LCD displays.


Ditto for CRT displays, as well.


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Kurt Riemann
 
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On 21 Nov 2005 00:57:37 -0800, wrote:

i heard of this ultrasonic device that makes people sick and barf.
anyone know about this?


Courtney Love?



Kurt Riemann
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Lorin David Schultz
 
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"Steve" wrote:

I knew a guy who found 40kHz unbearable.
We were working on an ultrasonic movement detector.
He would complain of pain and pressure in his ears any time it was
on.




I call bull**** on him.

I used to experience discomfort from ultrasonic systems too (when I was
in my early twenties... I don't have that problem anymore), but 40K?
C'mon...

--
"It CAN'T be too loud... some of the red lights aren't even on yet!"
- Lorin David Schultz
in the control room
making even bad news sound good

(Remove spamblock to reply)


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Scott Dorsey
 
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Lorin David Schultz wrote:
"Steve" wrote:

I knew a guy who found 40kHz unbearable.
We were working on an ultrasonic movement detector.
He would complain of pain and pressure in his ears any time it was
on.


I call bull**** on him.

I used to experience discomfort from ultrasonic systems too (when I was
in my early twenties... I don't have that problem anymore), but 40K?
C'mon...


I can believe the waveform coming out of those things might be pretty
crappy, and there may well be a considerable amount of sub-20K trash
coming out of them too, as well as the 40K stuff that's supposed to
be there.

I knew someone who swore he could hear C-band microwaves. Turned out
that he could actually tell when the beam was turned on and when it
wasn't. Then he found out that what he was hearing was actually
the sound of his skull expanding due to local tissue heating from the
beam. This would have been about 2,000 KW ERP, I think, but at a good
distance.
--scott


--
"C'est un Nagra. C'est suisse, et tres, tres precis."


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Geoff@work
 
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"Scott Dorsey" wrote in message
...

I knew someone who swore he could hear C-band microwaves. Turned out
that he could actually tell when the beam was turned on and when it
wasn't. Then he found out that what he was hearing was actually
the sound of his skull expanding due to local tissue heating from the
beam. This would have been about 2,000 KW ERP, I think, but at a good
distance.


That radio therapy should have killed off a few brain trumours, or caused
them.

geoff


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Rv!
 
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I used to work with someone who said that an insect
repeller hurt his ears and was audible. He's a muso who
went to the RSAMD in Glasgow. Nice guy, but a bit odd.

Anyway, once day I set up the insect repeller in his little workshop
about 3 feet from his head. It sat there all day without him noticing
or complaining at all. At the end of the day I showed him where it
was and he just couldn't comment.

What I think he was really complaining about was the start up of the
unit, although he never admitted it. When starting the item up the
tone swept up from probably 13KHz and disappeared quickly. It did
the opposite on power down. We all could hear it start and stop
but nobody (none of our test-rats) could hear it running.

Rv!


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Arny Krueger
 
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"Rv!" wrote in message

I used to work with someone who said that an insect
repeller hurt his ears and was audible. He's a muso who
went to the RSAMD in Glasgow. Nice guy, but a bit odd.

Anyway, once day I set up the insect repeller in his
little workshop about 3 feet from his head. It sat there
all day without him noticing or complaining at all. At
the end of the day I showed him where it was and he just
couldn't comment.
What I think he was really complaining about was the
start up of the unit, although he never admitted it. When
starting the item up the tone swept up from probably
13KHz and disappeared quickly. It did the opposite on
power down. We all could hear it start and stop but nobody
(none of our test-rats) could hear it running.


Once again demontrating the benefits of blind listening
tests.


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Bill Vermillion
 
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In article ,
Scott Dorsey wrote:
wrote:
i heard of this ultrasonic device that makes people sick and barf.
anyone know about this?


Other way. You're thinking of infrasound. Most folks have some frequency
usually in the 7-10 Hz range that will cause their abdominal cavity to
resonate. Very weird feeling.

Although there have been some sounds in the audible range that might make
one sick as well... Flora Foster-Jenkins comes to mind....
--scott


Actually Florence Foster-Jenkins. We had the original 10" RCA LP
in our music library at the campus radio station.

And who can forget the popular stylings of Leona Anderson with
YoHo The Crow, and Rat's In My Room?

Bill
--
Bill Vermillion - bv @ wjv . com
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