I have a number of Google Home smart speakers in the house. In the light of this discussion I thought I would ask Google AI if they could be used for spying on me Not that I have anything to hide, although if I called a politician on TV “bombastic” it could raise a red flag!
Google’s AI replied:
“Your Google Home speaker’s ambient listening is processed locally on the device, meaning it does not stream your continuous background conversations to the cloud. However, once the device is triggered—either intentionally or by accident—audio recordings are sent to Google’s servers, where they can potentially be reviewed by Google employees or trusted third parties. [1, 2, 3, 4]
Here is exactly how the technology works and where your data goes:
1. The “Passive” Listening Stage (Strictly Local)
To hear the wake word (“Hey Google”), the device operates in a short, local loop. It constantly records and overwrites fragments of audio locally on the device’s chip. [1, 2, 3]
No data is uploaded to the internet during this stage.
If the device does not detect “Hey Google” or “Ok Google,” that audio snippet is permanently deleted after a few seconds. [1, 2, 3]
2. The “Active” Processing Stage (Cloud Storage)
Once the speaker detects what it believes is the wake word, its status lights turn on. At this exact moment, it opens a stream and sends the audio recording to Google’s cloud servers to process your request. [1, 2, 3]
Can Google or third parties hear it?
Accidental Triggers: Smart speakers sometimes experience “false positives”—misinterpreting background noise, television dialogue, or normal conversation as the wake word. When this happens, it records and uploads the audio anyway. [1, 2, 3]
Human Reviewers: Google employees and trusted third-party subcontractors review a tiny fraction (historically around 0.2%) of these cloud-stored audio snippets to train and improve language recognition. [1, 2]
Opt-In Controls: Google is transparent that audio recordings are only saved to your Google Account if you have specifically opted into the Voice & Audio Activity (VAA) setting. If opted out, the requests are processed and then discarded rather than saved to your history. [1]
How to protect your privacy
Use the physical mute switch: Every Google Nest and Home speaker has a hardware switch or button to completely cut power to the microphone, stopping all local listening. [1]
Review and delete recordings:
You can see and listen to everything your speaker has recorded by visiting Google My Activity.
Turn off audio saving: Go to your Google Account settings, find “Web & App Activity,” and ensure that “Include voice and audio recordings” is unchecked. [1, 2]”
Of course Google could be lying but you do have to weigh up the benefits vs., the dangers. For me, as an eighty year old living alone, the biggest benefit is that if I end up lying injured on the floor I can call for help.
Russell