This article is more than eight years old

Chromecast to use ultrasonic connectivity to pair mobiles and TVs

Google’s Chromecast media streamer, which enables users to send shows, movies, music and more to large screens, is to use a new ultrasonic connectivity technology to enable mobile devices to be paired with a Chromecast-equipped television, GigaOm reports.

CONNECTIVITY: Chromecast streaming stick plays a unique ultrasonic sound

“The new pairing feature will enable users to cast their content even if their phone is connected to a mobile network,” GigaOm says.

“To enable this, Chromecast owners have to first allow support for nearby devices. After that, any user in the vicinity of a Chromecast can request from within any cast-enabled app. The Chromecast streaming stick then plays a unique ultrasonic sound through the TV’s loudspeakers.

“That sound won’t be audible by human ears, but a mobile device in the same room will be able to pick it up and pair with the TV. Alternatively there will also be a four-digit PIN displayed on the TV screen, making it possible to manually pair both devices.”

Currently, devices that want to pair with a Chromecast first need to be connected to the same WiFi network.

Google developer Boris Smus outlined how the new connectivity technology works in a blog post last year and produced a video showing how it could be used to display content streamed by a mobile phone on a television:

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