> > is it at all posible to write some software that would help drown out > > natural sounds and heihten important ones like conversations. > > > > I know that the people at the hearing aid companies have been working > > on this sort of thing for a while. > > I've had thoughts about this, but I think it would be much simpler/work > better to do it with hardware... > > ie: Put a highly directional microphone (mic1) in front of your mouth, > and second omnidirectional mircophone (mic2) on your > shoulder/back/chest/topofhead... Then use an op-amp wired in a > subtractive sort of way to remove the waveform of mic2 from that of > mic1, if you get my drift. It sounds like what you're describing would only work for the wearer. In other words, a noise-cancelling mike. These are commercially available, although they work a little differently from what you describe. They are basically open on both sides of the element, so the user (usually a pilot) talks (applies sound pressure) to only one side of the element, while any other sound (engine/cockpit noise, for example) hits both sides of the element equally, and doesn't register. Or at least that was the theory as described to me in flight school. The only problem with these mikes is that they are not very senstive, and you literally have to hold one up to your mouth close enough that your lips brush it. Paul Archer ---------------------------------------------------- A key to the understanding of all religion is that a god's idea of amusement is Snakes And Ladders with greased rungs. -- Terry Pratchett, "Wyrd Sisters" ---------------------------------------------------- -- Subcription/unsubscription/info requests: send e-mail with subject of "subscribe", "unsubscribe", or "info" toWear-Hard Mailing List Archive (searchable): http://wearables.ml.org
From Wear-Hard Mailing list Archive (WH)
Maintained by R. Paul McCarty
Archive created with babymail