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MrPlow writes:

Submitted via IRC for SoyGuest52256

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

Once your phone hears the trigger, it would begin to record 'ambient noise' in your home, such as the sound of your air conditioning unit, plumbing noises from your pipes and even your movements from one room to another.

Your phone would even listen in on 'distant human speech' and 'creaks from thermal contraction', according to the patent.

TV advertisers would use this data to determine whether you had muted your TV or moved to a different room when their promotional clip played.

Source: http://www.dailymail.co.uk/sciencetech/article-5882587/Facebook-wants-hide-secret-inaudible-messages-TV-ads-force-phone-record-audio.html

Original Submission