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by jmgrosen
3149 days ago
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Not quite used for in-store advertising, but Google's "Nearby Messages API" does use "near-ultrasound" audio signals to communicate with other devices: https://developers.google.com/nearby/messages/overview. I don't know if it would work at a larger scale, though (maybe you couldn't allow dogs in your store!). |
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https://www.wired.com/2016/11/block-ultrasonic-signals-didnt...
https://arstechnica.com/tech-policy/2015/11/beware-of-ads-th...
https://www.theatlantic.com/technology/archive/2015/11/your-...