Um...Me123 Posted February 26, 2006 Report Share Posted February 26, 2006 I have heard (and seen in a movie) about devices that pick up a sound, invert it, and play it back out to create destructive interference resulting in silence. Apparently this is how noise canceling headphone that Bose makes work. I just want to try to make a small device that you can point at something (has to be close by to keep in sync) and make it silent. Nothing complicated.How do I use a transistor to invert the signal then how do I use a small 8ohm .5w speaker to cancel it.With a small speaker that has next to 0 watts I should be able to make fairly quiet noises become silent (like whispering).....right?It's just an idea out there... Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 26, 2006 Report Share Posted February 26, 2006 Noise-cancelling headphones "reduce" noises, they don't completely cancel them. It works only at lower audio frequencies where the wavelengths are long enough so that the cancelling wave has the opposite phase of the original wave.If you use a speaker instead of headphones then it will be nearly impossible to stop acoustical feedback howling. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.