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An app that transmits data via a burst of "digital birdsong" aims to simplify the way users share images and other files between smartphones.
Chirp plays a two-second long noise that sounds as if it was made by a robotic bird. When heard by other devices it triggers a download.
It can also work over public address systems or radio transmissions - potentially allowing broadcasters a way to send up-to-date pictures or links to background information; or an advertiser to send coupons or snippets of a song or promotional video.
Animal Systems subscribes to a "blacklist" service to prevent users transmitting known pron or illegal-content website links. However, it does not plan to moderate other material.