Google’s Chromecast will use ultrasonic sounds to connect with nearby devices

Google wants to make the experience of using Chromecast more social. To do that, it’s opening up the $ 35 device to everyone in your living room, regardless of whether or not they’re connected to your Wi-Fi network. Announcing the new feature during yesterday’s I/O keynote, Chromecast Product Manager Rishi Chandra said, “We’re using a variety of different technologies, which allows us to authenticate users in the same room as Chromecast.” But considering how cool one of those technologies is, it’s surprising that Chandra didn’t offer more details.

GigaOm says Google’s using ultrasonic audio cues to help make the connection between smartphones, tablets, and your TV. These sounds — emitted by the TV that your Chromecast is plugged into —…

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