[Ed. – The headline is no exaggeration. That’s literally what the patent is for. The trigger causes your phone to transmit audio.]
Facebook wants to spy on you by hiding inaudible messages in TV ads.
These secret messages would force your phone to record audio of your private conversations without you knowing, according to a patent application by the firm.
Clips taken of your background conversations or movements across a room would help advertisers determine whether you are watching their promotions.
According to the patent, spotted by Metro, the system would use ‘a non-human hearable digital sound’ to activate your phone’s microphone.
This noise, which could be a sound so high-pitched that humans cannot hear it, would contain a ‘machine recognisable’ set of Morse code-style beeps.