13-02-2024, 11:00 AM
(12-02-2024, 09:57 PM)Stooky Bill Wrote: Yes I think the system is called invisidot.
It was discussed here
www.tvforum.co.uk
Invisidot is now being phased out as the company that made the hardware has discontinued it. I'm told it's being replaced by tones on embedded audio tracks.