Main Question or Discussion Point
Is there a way to build a device that neutralizes the sound frequencies so you or someone else cannot hear anything ie: when glass breaks on a cement floor?
These two paragraphs contradict each other - the second one is right. All you need is for the mic and speaker to be far enough apart that the signal can be calculated and generated in time to cancel the sound. Thats how headphones work - they are self-contained.Originally posted by Chi Meson
To cancel all the sound, though, you need a cancellation device right at the source of the original noise. Otherwise you can only cancel at specific locations, usually right where the device is located.
I know of one such device used on destroyers and other Navy craft where the engine drone is constantly above 80 dB. The device is located in every bunk, just above the sailor's head. Sound is canceled within a semi-circle of about 2 foot radius, usually where the sailor's ears are. THis way, they don't have to sleep with earplugs. BUt each and every bunk needs one.
I bunked on the O2 level of the USS JFK, 2 decks up, on the flight deck was the spot where the flyboys tied down the jets and tested engines. Just imagine the teenager next door reving his hotrod, only give him afterburners. Just below, my bunk, on the hanger bay level was the metal shop where they worked on things like aircraft skin patches, high speed band saws would be my guess, what ever was in there was noisy.The device is located in every bunk, just above the sailor's head. Sound is canceled within a semi-circle of about 2 foot radius, usually where the sailor's ears are. This way, they don't have to sleep with earplugs. But each and every bunk needs one