Hackers send silent commands to speech recognition systems with ultrasound

Re:Hackers send silent commands to speech recognition system... by EGreg on Friday September 08, 2017 @09:40AM (#15200045)

Can't Alexa, et al simply look for a certain volume and duration in the audible range, which sounds like speech, in order to activate?

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Re:Hackers send silent commands to speech recognition system... by javra on Friday September 08, 2017 @09:55AM (#15200142)

I think volume is the key here... The hackers induced harmonics in the audible range but at a volume that was only perceivable by the microphone and not by the bystanders. So to me it seems that it's possible to prevent this by require a higher threshold of volume to activate.

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Re:Hackers send silent commands to speech recognition system... by EGreg on Friday September 08, 2017 @10:08AM (#15200239)

I am just worried the hackers will then make sounds that sound like noise, but at least it will be characteristic and alert the person (maybe).

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