Facebook patents system that can use your phone's mic to monitor TV habits - The patent application describes a system where an audio fingerprint embedded in TV shows or ads, inaudible to human ears, would trigger the phone, tablet or long-rumoured smart speaker to turn on the microphone https://ift.tt/2IFd5cA https://ift.tt/2Kx3NEj https://ift.tt/2Kx3NEj https://ift.tt/2ICsdan

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