Smart Devices & IoT Beginner
A smart speaker listens for its wake word, but listening for a wake word is not the same as recording and sending everything. It checks a short, temporary loop of sound and only sends your request after it hears the wake word.
Most smart speakers run a small 'wake word' detector on the device itself, continuously analysing a short rolling buffer of audio locally. Until it detects its wake word (like 'Alexa,' 'Hey Google,' or 'Hey Siri'), that buffered sound is discarded and overwritten and nothing leaves the device. Once the wake word fires, the speaker typically streams the request that follows to the company's cloud for speech recognition and a response, and often keeps a voice history tied to the account. Two things are worth teaching: false wakes happen when ordinary sound resembles the wake word, so an unintended snippet can be captured and sent; and 'off' has levels — a hardware mic-mute switch electrically disables the microphone and is stronger than a software setting. Useful controls are the listening indicator, the mic-mute switch during private conversations, and periodically reviewing or deleting voice history and checking the privacy and voice-recognition settings. The honest framing for kids is 'know when it's active and know where your request goes' — not 'it's always spying,' and not 'it never listens.'
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