Lasers can beam audible messages directly to people’s ears

Researchers at MIT’s Lincoln Laboratory, a United States Department of Defense research facility, developed laser systems that can “transmit various tones, music and recorded speech at a conversational volume” to specific people without the recipient wearing any special equipment. Basically, the operator points a laser at someone from a distance and that individual hears the transmitted audio even though others in the area don’t. Conspiracy theorists, start your engines. From the Optical Society of America:

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Tau.Neutrino said:

Lasers can beam audible messages directly to people’s ears

Researchers at MIT’s Lincoln Laboratory, a United States Department of Defense research facility, developed laser systems that can “transmit various tones, music and recorded speech at a conversational volume” to specific people without the recipient wearing any special equipment. Basically, the operator points a laser at someone from a distance and that individual hears the transmitted audio even though others in the area don’t. Conspiracy theorists, start your engines. From the Optical Society of America:

more…

One old spy device was to aim a laser at a window pane to record all the voices and noises inside.

The Russians went one better and made a spy device with no electronics, just a resonant cavity that would vibrate to the sounds around it. To be read off by laser.

Tau.Neutrino said:

Lasers can beam audible messages directly to people’s ears

Researchers at MIT’s Lincoln Laboratory, a United States Department of Defense research facility, developed laser systems that can “transmit various tones, music and recorded speech at a conversational volume” to specific people without the recipient wearing any special equipment. Basically, the operator points a laser at someone from a distance and that individual hears the transmitted audio even though others in the area don’t. Conspiracy theorists, start your engines. From the Optical Society of America:

more…

> One unique aspect of this laser sweeping technique is that the signal can only be heard at a certain distance from the transmitter.

That could be done with a pair of lasers made to intersect and focus at the required location.

Very similar lo laser Doppler anemometry. The pair of lasers generate moving interference fringes.

mollwollfumble said:

Tau.Neutrino said:

Lasers can beam audible messages directly to people’s ears

Researchers at MIT’s Lincoln Laboratory, a United States Department of Defense research facility, developed laser systems that can “transmit various tones, music and recorded speech at a conversational volume” to specific people without the recipient wearing any special equipment. Basically, the operator points a laser at someone from a distance and that individual hears the transmitted audio even though others in the area don’t. Conspiracy theorists, start your engines. From the Optical Society of America:

more…

One old spy device was to aim a laser at a window pane to record all the voices and noises inside.

The Russians went one better and made a spy device with no electronics, just a resonant cavity that would vibrate to the sounds around it. To be read off by laser.

And they presented it as a gift to the American embassy in Moscow. Sheer brilliance :)

sibeen said:

mollwollfumble said:

Tau.Neutrino said:

Lasers can beam audible messages directly to people’s ears

Researchers at MIT’s Lincoln Laboratory, a United States Department of Defense research facility, developed laser systems that can “transmit various tones, music and recorded speech at a conversational volume” to specific people without the recipient wearing any special equipment. Basically, the operator points a laser at someone from a distance and that individual hears the transmitted audio even though others in the area don’t. Conspiracy theorists, start your engines. From the Optical Society of America:

more…

One old spy device was to aim a laser at a window pane to record all the voices and noises inside.

The Russians went one better and made a spy device with no electronics, just a resonant cavity that would vibrate to the sounds around it. To be read off by laser.

And they presented it as a gift to the American embassy in Moscow. Sheer brilliance :)

:-)

Makes sense

American Scottish fiddlers. They’re pretty good.

Scottish Fiddle Duo – with Jeremy Kittel and Hanneke Cassel

https://www.youtube.com/watch?v=EaqtxlFeWgQ

Bubblecar said:

American Scottish fiddlers. They’re pretty good.

Scottish Fiddle Duo – with Jeremy Kittel and Hanneke Cassel

https://www.youtube.com/watch?v=EaqtxlFeWgQ

But they can’t beam it directly to your ears.