Do you know of any ‘voice-tracking’ cameras?

I do have a camera with ‘tracking’, but it is tracking the face of the presenter (or multiple presenters on average in some cases). Logitech QuickCam Orbit AF: http://www.logitech.com/en-us/webcam-communications/webcams/devices/3480 There is no regular camera that will track voice that I know of other than the very expensive option from Microsoft *but* that was not working […]