30 Mar
2007
30 Mar
'07
6:54 p.m.
I saw the mosquito device that will annoy younger
people, but not older people:
http://www.compoundsecurity.co.uk/teenage_control_products.html
Its pretty expensive. How would I begin to create that
from scratch? Can a sound-card generate those frequencies?
I imagine I would need a special speaker.
How about an amp?, does that also need to transmit the
higher freqs.? Is it like going from a bass amp to
a guitar amp? (and I need to keep going?)
Whats good software in linux to generate certain frequencies?
thanks for any ideas,
--
paul w
30 Mar
30 Mar
7:07 p.m.
New subject: [linux-audio-user] Create high-pitch noises like the mosquito device
listreader wrote:
I saw the mosquito device that will annoy younger
people, but not older people:
http://www.compoundsecurity.co.uk/teenage_control_products.html
Its pretty expensive. How would I begin to create that
from scratch? Can a sound-card generate those frequencies?
Yes, the frequencies are in the range 18kHz to 20kHz. Obviously
you need to choose a sample rate on the sound card which can
reproduce these frequencies, ie 44.1kHz or above.
I imagine I would need a special speaker.
Standard tweeters from a standard stereo should reproduce them just
fine.
How about an amp?, does that also need to transmit
the
higher freqs.?
Any decent amplifier should do it.
Whats good software in linux to generate certain
frequencies?
It should be easy to create these sounds using Csound, Supercollider,
Pd, or in fact any of the many, many soft synths available for Linux.
Erik
--
+-----------------------------------------------------------+
Erik de Castro Lopo
+-----------------------------------------------------------+
"I invented the term Object-Oriented, and I can tell you I
did not have C++ in mind." -- Alan Kay
7:40 p.m.
New subject: [linux-audio-user] Create high-pitch noises like the mosquito device
On 3/30/07, listreader <listreader(a)lupulin.net> wrote:
I saw the mosquito device that will annoy younger
people, but not older people:
http://www.compoundsecurity.co.uk/teenage_control_products.html
Its pretty expensive. How would I begin to create that
from scratch? Can a sound-card generate those frequencies?
I imagine I would need a special speaker.
How about an amp?, does that also need to transmit the
higher freqs.? Is it like going from a bass amp to
a guitar amp? (and I need to keep going?)
It would likely be easiest to just make an electronic device like the
one in the article... Use a 555 timer (or other simple oscillator)
hooked up to a small audio amp, then to a tweeter.
I know, I know, not a Linux solution... ;-)
-TimH
8:23 p.m.
New subject: [linux-audio-user] Create high-pitch noises like the mosquito device
On Fri, Mar 30, 2007 at 03:40:55PM -0800, Tim Howard wrote:
On 3/30/07, listreader <listreader(a)lupulin.net>
wrote:
>I saw the mosquito device that will annoy younger
>people, but not older people:
> http://www.compoundsecurity.co.uk/teenage_control_products.html
>
>Its pretty expensive. How would I begin to create that
>from scratch? Can a sound-card generate those frequencies?
As pointed out by Tim below, it shouldn't be expensive.
This thing seems to be targeted to people with enough
money and holding strange opinions. To quote the web page:
"Anti social behavior has become the biggest threat to
private property over the last decade and there has
been no effective deterrent until now."
As if you could solve this by a 'deterrent'. If I were
an "anti-social teenager" I'd keep my iPod earphones in
place and be immune to this gadget. The even more anti-
social would probably use a paint spray to disable the
thing in seconds. I wouldn't blame them for doing so.
It would likely be easiest to just make an electronic
device like the
one in the article... Use a 555 timer (or other simple oscillator)
hooked up to a small audio amp, then to a tweeter.
That's indeed all it should take. Total component cost
around $15 or even less.
--
FA
Follie! Follie! Delirio vano è questo !
8:31 p.m.
New subject: [linux-audio-user] Create high-pitch noises like the mosquito device
Tim Howard wrote:
On 3/30/07, listreader <listreader(a)lupulin.net>
wrote:
I bet somewhere there's a CSound or Supercollider patch that does it.
Also note that their claim about older people not being able to hear it
(or younger people being able to hear it) is not necessarily true. It
depends on the person. By the time I finished high school, I probably
couldn't hear anything above 15KHz courtesy of loud hard rock music. I
wouldn't be surprised if a number of the kids I see on the bus - the
ones playing music through headphones so loud that you can hear the
music six feet away - can't hear it, either.
--
David
gnome(a)hawaii.rr.com
authenticity, honesty, community
I saw the mosquito device that will annoy
younger
people, but not older people:
http://www.compoundsecurity.co.uk/teenage_control_products.html
Its pretty expensive. How would I begin to create that
from scratch? Can a sound-card generate those frequencies?
I imagine I would need a special speaker.
How about an amp?, does that also need to transmit the
higher freqs.? Is it like going from a bass amp to
a guitar amp? (and I need to keep going?)
It would likely be easiest to just make an electronic device like the
one in the article... Use a 555 timer (or other simple oscillator)
hooked up to a small audio amp, then to a tweeter.
I know, I know, not a Linux solution... ;-) 
9:34 p.m.
New subject: [linux-audio-user] Create high-pitch noises like the mosquito device
On Friday 30 March 2007 20:31, david wrote:
Also note that their claim about older people not
being able
to hear it (or younger people being able to hear it) is not
necessarily true. It depends on the person. By the time I
finished high school, I probably couldn't hear anything above
15KHz courtesy of loud hard rock music. I wouldn't be
It works the other way too. I lost a lot of my high-frequency
hearing at one rock concert at age 18 (was pressed right up
against the speakers and didn't know enough to stuff my ears
with tissue.) Now I'm 37. I can't make out voices if I'm in
proximity to running water or other white noise in the same
frequency range, but I can still hear really high-pitched whines
like the ones CRT's and some security systems make. I'm sure
there are other adults who'd be annoyed by this thing too.
That said... ear buds and/or spray paint, totally. Not that
teenagers who are loitering are likely to be wearing ear buds
while they talk to each other, nor are they likely to escalate
to vandalism, but those are options. Much as some people would
like you to believe that teenagers behave like insects or
rodents, they never have and probably never will. That device
and its site are comical. As far as I can tell, the biggest
change that's come about as a result of its existence is that
teenagers now have ringtones that they can hear and most adults
can't:
http://www.npr.org/templates/story/story.php?storyId=5434687
But who knows, maybe the next time I go to the mall in a year or
two maybe I'll hear "eeeee, eeeee, eeeee....."
Rob
1 Apr
1 Apr
4:10 p.m.
listreader wrote:
[..]
Whats good software in linux to generate certain frequencies?
judging from your motivation I can't say if it's /good software/, but
"xmms" is avail. for many linux-distros:
xmms tone://1000 # is pretty annoying
xmms tone://15000 # even more so
xmms tone://18000 # is beyond my laptop's speaker capabilities
5:39 p.m.
New subject: [linux-audio-user] Create high-pitch noises like the mosquito device
Robin Gareus wrote:
listreader wrote:
My motivation?! What? I didn't say anything about why I wanted to copy
that device. I think it's a cool exercise.
Thanks for the suggestions.
--
paulw
[..]
Whats good software in linux to generate certain frequencies?
judging from your motivation I can't say if it's /good software/, but
"xmms" is avail. for many linux-distros:
3 Apr
3 Apr
9:58 a.m.
New subject: [linux-audio-user] Create high-pitch noises like the mosquito device
listreader wrote:
Robin Gareus wrote:
sorry, if my comment was a ambiguous. If you've got some more time to
exercise, it's easy to do a hardware implementation - it's called
"astable multivibrator" take a battery, two Transistors a Cap and few
Resistors,... - eg. http://en.wikipedia.org/wiki/Multivibrator - for a
more professional approach, follow the NE555 IC idea. radio-shack sells
those..
If you want to get into making annoying noises: try to modulate
some high-freq. osc. - there are various tools to generate/synth sounds
on linux..
http://apps.linuxaudio.org/apps/categories/software_sound_synthesis_and_mus…
depending on your flavor try spiralsynthmodular, pure-data,
supercollider, or a dog-whistle + old hair-dryer approach ;) - There is
also the possibility of creating sick-feelings with some <16Hz sounds -
they don't exactly qualify the subject, but are IMHO more interesting.
listreader wrote:
My motivation?! What? I didn't say anything about why I wanted to copy
that device. I think it's a cool exercise. [..]
Whats good software in linux to generate certain frequencies?
judging from your motivation I can't say if it's /good software/, but
"xmms" is avail. for many linux-distros:
[..]
11:02 a.m.
New subject: [linux-audio-user] Create high-pitch noises like the mosquito device
On Tue, Apr 03, 2007 at 03:58:48PM +0200, Robin Gareus wrote:
also the possibility of creating sick-feelings with
some <16Hz sounds -
they don't exactly qualify the subject, but are IMHO more interesting.
The right frequency and amplitude and you'll run for the smallest room
and arrive there too late.
--
FA
Follie! Follie! Delirio vano è questo !
11:52 a.m.
New subject: [linux-audio-user] Create high-pitch noises like the mosquito device
Robin Gareus wrote:
If you've got some more time to
exercise, it's easy to do a hardware implementation - it's called
"astable multivibrator" take a battery, two Transistors a Cap and few
Resistors,... - eg. http://en.wikipedia.org/wiki/Multivibrator - for a
more professional approach, follow the NE555 IC idea. radio-shack sells
those..
If you want to get into making annoying noises: try to modulate
some high-freq. osc. - there are various tools to generate/synth sounds
on linux..
http://apps.linuxaudio.org/apps/categories/software_sound_synthesis_and_mus…
depending on your flavor try spiralsynthmodular, pure-data,
supercollider, or a dog-whistle + old hair-dryer approach ;) - There is
also the possibility of creating sick-feelings with some <16Hz sounds -
they don't exactly qualify the subject, but are IMHO more interesting.
This stuff is great. I know that this isn't "linux" related, but i bought a
couple if 555 IC as per the previous suggestion to make a high pitched siren.
Next I'll move on to the following suggestion ... "makes you need to go poop ...
now" noises. This 555 thing will take me a while, i need to brush up onmy soldering
skills.
thanks for the ideas :),
--
paulw
12:14 p.m.
New subject: [linux-audio-user] Create high-pitch noises like the mosquito device
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Hash: SHA1
On Tue, Apr 03, 2007 at 11:52:03AM -0400, listreader wrote:
Robin Gareus wrote:
That's an urban myth:
http://en.wikipedia.org/wiki/Brown_note
- -ken
If you've got some more time to
exercise, it's easy to do a hardware implementation - it's called
"astable multivibrator" take a battery, two Transistors a Cap and few
Resistors,... - eg. http://en.wikipedia.org/wiki/Multivibrator - for a
more professional approach, follow the NE555 IC idea. radio-shack sells
those..
If you want to get into making annoying noises: try to modulate
some high-freq. osc. - there are various tools to generate/synth sounds
on linux..
http://apps.linuxaudio.org/apps/categories/software_sound_synthesis_and_mus…
depending on your flavor try spiralsynthmodular, pure-data,
supercollider, or a dog-whistle + old hair-dryer approach ;) - There is
also the possibility of creating sick-feelings with some <16Hz sounds -
they don't exactly qualify the subject, but are IMHO more interesting.
This stuff is great. I know that this isn't "linux" related, but i bought
a couple if 555 IC as per the previous suggestion to make a high pitched
siren.
Next I'll move on to the following suggestion ... "makes you need to go
poop ... now" noises. This 555 thing will take me a while, i need to brush
up onmy soldering skills.
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4:04 p.m.
New subject: [linux-audio-user] Create high-pitch noises like the mosquito device
Ken Restivo wrote:
That's an urban myth:
http://en.wikipedia.org/wiki/Brown_note
Do you trust those mythbusters to get it right? - I took Fons' remark
as a late april fools hoax and the "small room" allusion as hint that he
regularly reads email lists (-: but maybe he had some experience while
debugging aliki.
There is some medical therapy that involves low freq. "infrasound
massages" and it apparently works well to relax muscles and stir up some
%*&#. - not that it'd have any applications as Anti-Theft device, but
maybe one can make a fortune with infrasound-sex-toys... IIRC there's a
555 based "spooky sound generator" DIY kit at Conrad-Electronics. 666
would have been to obvious!
seriously, low frequencies make a lots flair in cinema. and a just 17Hz
sine won't do the trick there. - I had good experience with
`paul-strech`ing a cello sample and smoothing/filtering it with rezound.
robin
1:15 p.m.
New subject: [linux-audio-user] Create high-pitch noises like the mosquito device
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Hash: SHA1
On Tue, Apr 03, 2007 at 03:58:48PM +0200, Robin Gareus wrote:
listreader wrote:
I had good luck using Schmidt triggers to make quick-and-dirty square-wave oscillators for
testing purposes:
http://en.wikipedia.org/wiki/Schmitt_trigger
Very cheap and simple: one chip, a resistor, and a cap, IIRC.
- -ken
Robin Gareus wrote:
sorry, if my comment was a ambiguous. If you've got some more time to
exercise, it's easy to do a hardware implementation - it's called
"astable multivibrator" take a battery, two Transistors a Cap and few
Resistors,... - eg. http://en.wikipedia.org/wiki/Multivibrator - for a
more professional approach, follow the NE555 IC idea. radio-shack sells
those..
listreader wrote:
My motivation?! What? I didn't say anything about why I wanted to copy
that device. I think it's a cool exercise. [..]
Whats good software in linux to generate certain frequencies?
judging from your motivation I can't say if it's /good software/, but
"xmms" is avail. for many linux-distros:
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linux-audio-user@lists.linuxaudio.org
13 comments
8 participants
participants (8)
-
david -
Erik de Castro Lopo -
Fons Adriaensen -
Ken Restivo -
listreader -
Rob -
Robin Gareus -
Tim Howard