Enlarge / Sonos Beam soundbar. (credit: Sonos) Google and Sonos are headed back to court. After Google lost an earlier patent case over speaker volume controls, Google is now suing Sonos over voice control technology. Google confirmed the lawsuit to The Verge this morning, with the company saying it wants to "defend our technology and challenge Sonos’s clear, continued infringement of our patents." Google alleges infringement of seven patents related to voice input, including hot-word detection and a system that determines which speaker in a group should respond to voice commands. Sonos has typically supported the Google Assistant and Amazon Alexa for voice control, but Google and Amazon are also Sonos's biggest speaker competitors.