Not an entirely new idea, we worked with a group out of MIT in the 90s which was creating focused sound environments. You could, for example create a localized sound in a store aisle that supported an advertising message, or a sound environment that supported a product there in some way. Worked quite well, you could not tell where the sound was originating. Was tested in our labs and never in a real environment, as it was seen as privacy invasive. The below seems to take this further. I like the personalized warning suggestion: 'You are approaching the cliff's edge!', and AR type integration.
World's First Sound Projector Targets Willing Individuals
The Engineer (UK)
August 5, 2019
Gianluca Memoli and colleagues at Sussex University in the U.K. demonstrated a sound projector they devised at the ACM SIGGRAPH conference. The projector uses face-tracking software to direct an acoustic telescope that focuses sound on moving targets. The system is affixed to a low-cost camera that can track an individual, and is capable of transmitting a 6cm sphere of sound in front of its target, which then can move along with the target. Said Memoli, "We believe this technology can be harnessed for plenty of positive applications, including personalized alarm messages in a crowd, immersive experiences without headphones, the audio equivalent of special effects."
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