really interested in the technology behind this. Obviously non voice frequencies can be filtered but how are they determining which voices are too far away to m

really interested in the technology behind this. Obviously non voice frequencies can be filtered but how are they determining which voices are too far away to matter? I'm sure I could probably read up more, but if these work it's definitely a "shut up and take my money" situation for me. I'm about as ADD as it gets and I have a really hard time when there are multiple conversations going and I try to listen to them all.