This is a most excellent place for technology news and articles.
This is a great case of confirmation bias, too. The one time your ad happens to match a conversation you had earlier, you’ll be convinced forever, and tell everyone you know about it. The ten million other times you have a conversation that doesn’t appear in your ads will go unnoticed.
Two ways to process voice, on device or on server. Device-based solutions either are very basic and just detect differences between words or need training data based on your voice or they need lots of processing power for more generalized voice recognition. So is your battery draining and phone is often hot because an app is keeping the mic on and keeping the phone from slowing the processor? Other option is to stream the data to the server. This would also increase battery usage as the phone can't sleep, but might not be as noticeable, but more evident would be your phone using a lot more bandwidth than is reasonable while you aren't actively using it.
I found indisputable proof of this happening.
We were using Google maps, driving in a production van. We were talking about the song “Gasolina” by daddy yankee. The person whose phone it was did not speak Spanish. Moments later we were being served suggestions to stop at “estaciones de gasolina”
