Chronology | Current Month | Current Thread | Current Date |
[Year List] [Month List (current year)] | [Date Index] [Thread Index] | [Thread Prev] [Thread Next] | [Date Prev] [Date Next] |
Sorry, the brand name of an English public address system. It’s like to
hover, instead of vacuum clean.
In this case not so “public”.
bc wonders why it’s vacuum clean instead of suction clean, and suck using
a straw instead of vacuum up a drink.
On 2020/Oct/09, at 06:45, Brian Whatcott <betwys1@sbcglobal.net> wrote:acoustic wave is inaudible to the ear, but audible to the usual microphone,
This note suggests that in the usual way, an audio modulated ultrasonic
such as yours.
No, the voice was quite audible, I wasn’t deaf then. The “beam” was only
about a foot wide at a coupala yards away, i.e. ~ 0.1 radian. (6 deg.)
Brian Wsophisticated. Google, Apple, Amazon, numerous c...
Secret Ultrasonic Commands Can Control Your Smartphone, Say Researchers
|
|
| |
Secret Ultrasonic Commands Can Control Your Smartphone, Say Researchers
Voice-controlled digital assistants are increasingly common and
|bernard@cleyet.org> wrote:
|
|
On Friday, October 9, 2020, 01:35:59 AM CDT, bernard cleyet <
an ultrasonic speaker generated wave is voice modulated in order to produce
A friend reminded me of a demo. at the Naval Postgrad. School, wherein
a rather narrow bean Tannoy. I presume it works by the ear’s being
non-linear in amplitude response. Any idea if it would work W/a hearing
aid that has no gain above about 8k Hz?
bc whose hearing is about 60 dB down.
_______________________________________________
_______________________________________________
Forum for Physics Educators
Phys-l@mail.phys-l.org
https://www.phys-l.org/mailman/listinfo/phys-l