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A comment on Hackers send silent commands to speech recognition systems with ultrasound. Parent comment

Re:Hackers send silent commands to speech recognition system... by vel0city on Friday September 08, 2017 @10:00AM (#15200180)
Wouldn't it go through a bandpass filter to remove the ultrasonics before it makes it to the ADC? I thought that was common with DACs to reduce aliasing issues.
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Re:Hackers send silent commands to speech recognition system... by delinka on Friday September 08, 2017 @10:18AM (#15200305)
Apologies - I was amidst edits when I was called away. I've addressed this by suggesting removal of the LPF.
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