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Re. Daniel Finlay re. resonant frequency of the diaphragm of the
mic: <br>
<br>
Sounds good to me, and since the mics in question are likely to be
tiny condenser mics with tiny diaphragms, the frequency needed would
be rather high, possibly above audible range (there's an equation
for calculating this). Higher frequencies are more directional than
lower frequencies, meaning that they can be "aimed."<br>
<br>
It might be possible to use resonance to just outright destroy the
mics as well. (Think of an opera singer singing a note that
shatters a wine glass.) IMHO fair game, self-defense. <br>
<br>
Consider a wearable device that includes a discreet "audio cannon"
that emits a chirp of a frequency above audible range, or perhaps a
sweep of frequencies, loudly enough for the resonance to break the
diaphragm of any non-consensual microphone within let's say six feet
in front of you and a radius of a few feet around the center of
where the device is aimed.<br>
<br>
People could also use this to destroy any concealed mics in their
own devices, for example the hidden mics in laptops. ("If I want to
record audio on my laptop I can plug in an external mic, and unplug
it when I'm done, thank you very much! ;-)"<br>
<br>
This is basically just electronics, should be fairly easy to design
& build. Sine wave oscillator, amplifier, tiny audio
transducer. Making it wearable and stylish will take more work, and
making it catchy enough to go viral will be interesting. TV-B-Gone,
anyone?;-)<br>
<br>
-G.<br>
<br>
<br>
=====<br>
<br>
<br>
<div class="moz-cite-prefix">On 13-03-05-Tue 11:19 AM, Daniel Finlay
wrote:<br>
</div>
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type="cite">
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charset=ISO-8859-1">
If you knew the diaphragm size of the microphone in question,
you'd be better off just emitting its resonant frequency.
<div><br>
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<div>On Mar 5, 2013, at 11:16 AM, rachel lyra hospodar <<a
moz-do-not-send="true" href="mailto:rachelyra@gmail.com">rachelyra@gmail.com</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">
<p>Wouldn't it need to be non-commercially available music,
so they couldn't just find the audio data of the track,
invert its wave, and cancel it out of the recording?</p>
<p>CACOPHONY FOR THE REVOLUTION!</p>
<p><a moz-do-not-send="true"
href="http://mediumreality.com/">mediumreality.com</a></p>
<div class="gmail_quote">On Mar 5, 2013 10:23 AM, "Steve
Berl" <<a moz-do-not-send="true"
href="mailto:steveberl@gmail.com">steveberl@gmail.com</a>>
wrote:<br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
You could carry a boombox around playing loud music
where ever you go. Perhaps this would be the end of
earbuds. :-)<br>
<br>
<div class="gmail_quote">On Tue, Mar 5, 2013 at 10:20
AM, Anthony Di Franco <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:di.franco@gmail.com" target="_blank">di.franco@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<p>People have rendered surveillance cameras useless
with very bright IR LEDs in their fields of view.<br>
Could something similar be done for sound
recording devices?</p>
<div class="gmail_quote">On Mar 5, 2013 6:17 AM,
"Anon195714" <<a moz-do-not-send="true"
href="mailto:anon195714@sbcglobal.net"
target="_blank">anon195714@sbcglobal.net</a>>
wrote:<br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0
0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">
<br>
Yo's-<br>
<br>
Something I forgot to add re. DARPA's desire for
universal recording of<br>
face-to-face conversations.<br>
<br>
What's the ideal device for doing all that
recording?<br>
<br>
How'bout something you wear? How'bout something
that "everyone" wears?,<br>
or even a significant fraction of "everyone"?<br>
<br>
Like maybe Google Glasses.<br>
<br>
Always on, camera and mic always "connected" to
"the cloud." Orwell's<br>
telescreen gone mobile.<br>
<br>
Everyone who wears them will become, in effect,
_unpaid surveillance<br>
drones_ watching their family and friends, not
from up in the sky, but<br>
from up close where every word can be heard.<br>
<br>
Some will say "oh, there's no stopping
technology." People said that<br>
about the atomic bomb and the hydrogen bomb.
But public outcry led<br>
first to treaties and then to progressive
degrees of nuclear<br>
disarmament. We haven't used that technology
since it was first used in<br>
WW2.<br>
<br>
We can stop pernicious tech if we choose. We
can refuse, we can<br>
withdraw consent, we do not have to press the
Buy button.<br>
<br>
Technology should liberate and empower people.
"Conveniences with a few<br>
strings attached" are not liberation, they're
puppet-strings.<br>
<br>
It's all about control: technology that you can
control, vs. technology<br>
that can control you.<br>
<br>
-G.<br>
<br>
<br>
=====<br>
<br>
<br>
On 13-03-05-Tue 1:50 AM, Anon195714 wrote:<br>
><br>
> Yo's-<br>
><br>
> This just in:<br>
><br>
> "DARPA wants to make [voice
recognition/transcription] systems so<br>
> accurate, you’ll be able to easily record,
transcribe and recall all the<br>
> conversations you ever have. ... Imagine
living in a world where every<br>
> errant utterance you make is preserved
forever. ... DARPA [awarded<br>
> U.Texas comp sci researcher Matt Lease]...
$300,000... over two years to<br>
> study the new project, called “Blending
Crowdsourcing with Automation<br>
> for Fast, Cheap, and Accurate Analysis of
Spontaneous Speech.”"<br>
><br>
> "The idea is that business meetings or even
conversations with your<br>
> friends and family could be stored in
archives and easily searched. The<br>
> stored recordings could be held in servers,
owned either by individuals<br>
> or their employers. ... The answer, Lease
says, is in widespread use of<br>
> recording technologies like smartphones,
cameras and audio recorders...<br>
> [A] memorandum from the Congressional
Research Service described [an<br>
> earlier DARPA project of this type known
as] EARS, as focusing on speech<br>
> picked up from broadcasts and telephone
conversations, “as well as<br>
> extract clues about the identity of
speakers” for “the military,<br>
> intelligence and law enforcement
communities.”"<br>
><br>
> <a moz-do-not-send="true"
href="http://www.wired.com/dangerroom/2013/03/darpa-speech/"
target="_blank">http://www.wired.com/dangerroom/2013/03/darpa-speech/</a>
(Yes, "real geeks<br>
> don't read Wired," but nonetheless its news
pages are useful for keeping<br>
> a finger on the pulse of Big Brother and
his corporate Brethren.)<br>
><br>
> In short:<br>
><br>
> DARPA is researching the means by which
every conversation you have,<br>
> in-person, whether at work or with family
or friends, gets picked up by<br>
> the mic in your smartphone or other
portable device, and stored on a<br>
> server, where DARPA's algorithms and human
editors turn all of it into<br>
> fast-searchable text, that could be used by
your employer, the military,<br>
> law enforcement, and intel agencies.
Presumably the credit bureaus,<br>
> insurance companies, and financial
institutions will want "in" on the<br>
> data as well.<br>
><br>
> Now connect that with this, about cell-site
tracking and call detail<br>
> records:<br>
><br>
> "The government maintained [that] Americans
have no expectation of<br>
> privacy of such cell-site records [call
detail records or CDR] because<br>
> they are in the possession of a third party
— the mobile phone companies."<br>
><br>
> <a moz-do-not-send="true"
href="http://www.wired.com/threatlevel/2013/03/gps-drug-dealer-retrial/"
target="_blank">http://www.wired.com/threatlevel/2013/03/gps-drug-dealer-retrial/</a><br>
><br>
> The key point is that the gov's current
position is that data stored on<br>
> a third party's servers have "no
expectation of privacy." What begins<br>
> with CDR will eventually include voicemail
messages stored on the mobile<br>
> phone companies' servers, and then
eventually all of your live in-person<br>
> conversations that are stored "in the
cloud."<br>
><br>
> "Anything you say can and will be used
against you..." Mark my words.<br>
><br>
> Meanwhile people keep using gmail and
Google Voice, and smartphones from<br>
> which they can't remove the batteries.
Because nothing is more important<br>
> than "convenience," right?<br>
><br>
> As a character in a sci-fi piece I wrote in
the mid-1980s said, "Why put<br>
> a person in prison, when you can put prison
in the person instead?"<br>
><br>
> -G.<br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
>
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-- <br>
-steve
<br>
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