Said Amazon in a blog post, the company’s acoustic fingerprinting technology allowed the devices to distinguish between the wake-up words uttered in the ad—which sounded perfectly natural—and commands given to Alexa by actual users.

Amazon, of course, had the audio from the advertising to work with, with lots of time to spare. The company indicated that it also can build acoustic fingerprints on the fly. “When multiple devices start waking up simultaneously from a broadcast event, similar audio is streaming to Alexa’s cloud services,” said the blog post. “An algorithm within Amazon’s cloud detects matching audio from distinct devices and prevents additional devices from responding.”

Muss ja jeder selber wissen, ob er so ein Ding in seinem Haus haben will, aber ich finde das ziemlich creepy.