https://www.cnet.com/news/tcl-debuts-8k-roku-tvs-quantum-dot-and-more-dimming-zones-at-ces-2019/

In another first for Roku TV, select 4K models from TCL will incorporate built-in far-field voice control. That means you'll be able to speak into thin air, hands free. You'll also be able to perform searches and other voice commands without using the remote. US versions will use Roku's voice system while TCL TVs outside the US will get Google Assistant far-field voice control.

TCL says the system takes advantage of beam-forming technology and AI noise cancellation to deal with the issue of the TV's own speakers overwhelming voice commands.