and now, it is going to pull out one of the bach... ..sebastian bach station from i heart radio.pany behind it are hoping to install their technology in virtual assistants. and it's notjust about being able to wake them up by tapping, it is also going to track how far away you are in the room so that the volume can be adjusted accordingly. a device's built—in speaker emits ultrasound waves and its microphone receives them, mapping where you are. the software acts on this information, maybe pausing or playing something you're watching or listening to, or in the case of a virtual assistant, turning heating or lighting on or off. but whilst there are ideas aplenty about how the future of voice could play out, for this year's ces, google and amazon certainly seem to be enjoying having the last word. thank you very much, goodbye. i'm afraid that's where we have to stop the shortcut of click for this week. the full length version is waiting for you right now on iplayer. and don't forget, we live on social media too — youtube, facebook, twitter and instagram at @bbcclick. thanks for wat