Shortly after releasing a brief teaser, Amazon uploaded its entire 90-second Super Bowl commercial for the world to see ahead of the big game. The ad showcases a number of celebrities filling in for Alexa after she loses her voice, and during the whole thing, the hot word "Alexa" is said 10 different times.

Previous commercials from other companies have used assistant hot words in intrusive ways, but Amazon's done something special to ensure that your Alexa doesn't continually go off when its ad is airing.

Undetecable audio cues keep Alexa quiet during commercials.

All the way back in September of 2014, Amazon published a patent by the name of "Audible command filtering." The patent describes two different methods for preventing Alexa from waking up when its name is said, and of the two, Amazon went with one that sends out an acoustic tone – not noticeable by humans – to cue Alexa to remain silent.

Amazon started to really push its Echo speakers with short advertisements about a year ago, and shortly after this, Reddit user Aspyhackr decided to investigate why the ads weren't triggering their Echo even though they clearly say "Alexa" at one point or another. After running a few tests, they were able to conclude (and confirm through tests), that the commercials send out audio signals anywhere from 3,000 to 6,000Hz so that Alexa doesn't respond with a command.

The same technique will be used during Sunday's game, and while it's not technically new, it's a nice reminder that there's more to Amazon's commercials than meets the eyes (or voice).

Amazon Super Bowl teaser hints at new Alexa voices

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