Small ideas can make Metro greater.

Pa System app. Use all the phones in the room as a pa system

Smartphone app that makes your phone into a supplemental PA announcement speaker. Pay special care to synchronize all the phones to a master clock and send the audio over dedicated local WiFi at low latency so all the participating phones work together with no echo

the app should monitor volume and battery usage, and cut out by fading out in round robin or randomly if too many phones are nearby.

Submitted by: Michael J., Silver Spring, MD


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