[omarhaneef]

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.

[rasz]

Werent there audio system calibrators in the nineties doing room calibration in similar manner (microphone on a cable)?

[moftz]

I had an old Bose surround sound system that did the same thing. You'd place the mic in the best seat in the room and it'd tune the phase to center the sound.

[Tostino]

My Sony surround sound box does this too...

[Justin_K]

Yep my Denon did this in 2000