Amazon has found a clever way of not accidentally awakening the Alexa-powered speakers.
Amazon asked what would happen if Alexa lost her voice and even threw in CEO Jeff Bezos to the mix.More news: Bitcoin extends slide, tumbling greater than 15 %
Now the retailer didn't specify how this works exactly, but as Bloomberg notes, there are two techniques at play here. Another method utilises transmitting an inaudible acoustic signal during an advert to tell Alexa to ignore a wake word. It weighs a little less than a pound, and Amazon says the battery can last up to 12 hours under mixed-use (browsing, streaming, and reading). By running Alexa commercials through digital audio editing software, Asphyhackr discovered that Alexa ads transmit weakened levels of sound in an upper portion of the audio spectrum, between 3,000 and 6,000 hertz, outside the most sensitive range of human hearing. To test his theory, he recorded someone saying "Alexa" and used a so-called band-stop filter that reduced frequencies just in this high region of the spectrum.
Here's the commercial in case you want to test out your Echo before the big game.
And since Amazon definitely wanted its Super Bowl LII to mention she-who-shall-not-be-named, and refer to her frequently, the company had to come up with a different way to do so in order to avoid hacking off everyone who already owns an Echo device.
During the advert, Amazon had cleverly ensured the Alexa in your house wouldn't respond when the advert was running.