This article had a cursory description of the patent(s) that was (were) allegedly violated:

https://www.engadget.com/sonos-google-itc-compliant-initial-...

Looks like the primary, initial complaint was around the tuning feature for the speakers. There is a link to subsequent complaints.

If you have a Sonos, when you first set up a speaker you use wave your mobile around while the speaker emits a tone and your phone mic sends it feedback on how to optimize the sound.