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AssigneeMassachusetts Institute of Technology
InventorsCharles Wynn, Yaron Rachlin, Ryan Sullenberger, Sumanth Kaushik
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The ability to communicate with a specific subject at a prescribed location who lacks any communications equipment opens up many intriguing possibilities. Communications across noisy rooms, hail and warn applications, and localized communications directed at only the intended recipient are a few possibilities. We disclose and show localized acoustic communications, which we call photoacoustic communications, with a listener at long standoff distances using a modulated laser transmitted toward the receiver's ear. The optically encoded information is converted into acoustic messages via the photoacoustic effect. The photoacoustic conversion of the optical information into an audible signal occurs via the absorption of the light by ambient water vapor in the near area of the receiver's ear followed by airborne acoustic transmission to the ear. The recipient requires no external communications equipment to receive audible messages.
A method of communications, the method comprising:
A method of communications, the method comprising:
A communications system comprising:
The communications system of 10, wherein the beam-steering element is further configured to change a rotational velocity of the intensity-modulated laser beam across the arc so as to change the range R at which the intensity-modulated laser beam travels at the linear speed of Mach 1.
A method of communications, the method comprising:
A method of proving a location of a receiver, the method comprising:
Dependencies are inferred from the claim text.