Voice assistants in smart speakers analyse every sound in their environment for their wake word, e.g., «Alexa» or «Hey Siri», before uploading the audio stream to the cloud. This supports users' privacy by only capturing the necessary audio and not recording anything else. The sensitivity of the wake word detection tries to strike a balance between data protection and technical optimisation, but can be tricked using similar words or sounds that result in an accidental trigger.
Well this makes an interesting read... My SONOS One triggers to the word "Unacceptable" - which is pretty odd as it doesn't sound at all like "Alexa"!
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