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Talk freely. Only you and your colleague will hear the conversation.
Can't find my old entry on this in HB!
SilenTalk works by inducing an ultrasonic sound (voice)
in your larynx. (see links)
A bluetooth mic picks up the sounds, translates them to
a digital stream of audio, which, when reaching your
smartphone, is interpreted as regular voice, and sent to
your ears as well as to the other person listening to you.
See link: with trutone you can talk normally. With
SilenTalk you can talk silently.
Only you and your listener can hear you.
Talk in the movie theater, talk at an important meeting.
Talk at night without waking anybody up.
Its an unheard-of invention helping free speech!
TruTone - similar device, but one that anyone can hear
The SilenTalk creates a sound that you can hear only with the SilenTalk Listener program in your smart phone [pashute, Nov 09 2011]
Wow! this is a genius invention
Much simpler and better than mine. Why didn't I think of it! [pashute, Nov 22 2011]
The throat microphone
a competing idea [pashute, Nov 22 2011]
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||//hypersonic// Do you mean ultrasonic? If so, it won't work; it's all to do with formants. If not, what do you mean?
||Subsonic (too quiet to hear, but detected by sensitive microphones) FTW; but that's baked by throat microphones and training, without a synthesized tone.
||Ultrasonic at the barely audible level works. Tested
and all, by yours truly, in an audio lab. Sorry for the
mistake in wording, thanks for the remark.
||Easier would be to speak through a microphone and
speaker that in the process adds noise such as a popular
song for example. The reciever would pick up your
transmission through a mic and remove the song leaving
your spoken message played through an earpiece.
||I agree with [spidermother,] I think you mean subsonic.
||1) How do you pick up sibilants, fricatives, plosives and other unvoiced phonemes? These do not rely on glottal pulses for excitation.
||2)Where is the laryngeal excitation source located?
||3) Where is the bluetooth mic located?
||4) How is it to be powered?
||(Subsonic appears to be used only for "slower than the speed of sound", not "too quiet to hear"; my bad.)
||I would still like you to spell out what you mean: is the sound induced in the larynx inaudible without SilenTalk because of
||Spider: (a) only. High frequency.
||Not subsonic. It works more like the artificial
larynx, except that it emits an ultrasonic tone.
The frequency can be changed by your button
similar to the trutone (see link) but all are
ultrasonic frequencies, slightly above the audible
1) The ultrasonic high frequency inaudible to
human ear tone enters the throat just like the
tone from the artificial larynx does: Its a mixture
of your breathing air out, and the resonating
larynx. - But in this case its resonating very fast in
what becomes inaudible.
||The shape of your mouth, location of your tongue
and teeth etc are all part of what makes up the
the voiced as well as unvoiced phonemes. The
closing of lips teeth and tongue create the
plosives, fricatives and sibilants.
||A regular artificial larynx is easy to use and does
not take much practice. This would be the same,
except that without the bluetooth mic and
processor you would hear only whispers (and those
could be lowered to a level that they become
unheard at all), and perhaps smacking of lips.
||2) So the laryngeal excitation is taking place in the
larynx, by the larynx, or echoed off the larynx
area, in a similar way to what happens with a
conventional artificial larynx.
||In important part of speech is the tones, and a
Trutone like device will solve that.
||3) The bluetooth mic (and processor) is located
outside the mouth, or on the input side of the
phone, so the talking person could put it to their
mouth. It transforms the ultrasonic sound into
||4) By batteries. Just like an artificial larynx is
powered by batteries, and just like a bluetooth
earphone works on batteries.
||A passive sensitive ultrasonic receiving mic could
lower the power needs, and this in turn would
make for a smaller device, perhaps even
connected to a smartphone directly, for its
||About subsonic implementations: When I first
conceived this idea and tried to raise money for it
around 2000 or 2001, (and even submitted a
provisional now expired) I researched and found a
company that makes what you described - a mic
on the throat, for the military so they can
communicate silently. But this idea is for civil use.