If you’ve ever had a bad surprise when your phone or smart speaker goes off with a “hey Google” response after saying “my friend Kay is thrifty”, you know how distracting and annoying it is. Google knows this too, and they do something about it, according to this official blog.
An update to the Google Assistant system and the Home app will allow users to change the sensitivity of the Google Assistant listening feature. This will make the detection phrase activated more or less frequently. So if you are tired of activating the speaker when you (or your TV) say random things, you can reduce the sensitivity. Alternatively, if you work in a noisy environment like a kitchen or a garage, you can mount it so that Google can hear you on ambient sounds.
Google indicates that it will deploy this option in “the weeks to come” and that it will be available via the Home application.
The sensitivity of each device can be changed. This can make your Nest Hub less likely to activate while making your phone more likely to hear you. Google also says that its voice detection improves through longer voice match phrases.
Source: Google Keyword Blog