How do electronic ear defenders work and are they effective?

Answer 1

Electronic noise cancelling devices work by generating an inverse soundwave against the background noise, cancelling it out. However, it is only effective against repetitive "constant" noise such as motors and some power tools, but if the noise is changing, the noise cancellation is less effective. Also not so effective against impact noises. A cheaper solution is to double ear plugs together with an over the ear noise protector to add extra noise reduction.

Answer 2

Do you mean the big over the ear defenders that have a little microphone and speaker thing in one ear so when you press the button on it you can hear what the person next to you is saying, but it cuts out a lot of the background noise? People where I work have tried them and they're not that impressed.
They've now got ones that I believe work a similar way but are moulded to fit into the shape of your ear, but you have to leave them in all the time your at work. The people I've spoken to so far are more impresed with those though they take a while to get used to.

Answer 3

sound cancelling ear defenders work very well. I use variphone ones which allow the sound of voices in but harmfull noises are blocked. They are passive and not electronic

Answer 4

All sound can be read on a cathode ray tube which shows up as waves of differing magnitude. There is a REVERSAL of these waves inside the headphones, therby cancelling the sound produced. In theory they should be 100% effective, but in fact they only reduce the volume by a certain amount.

Answer 5

what?


Pardon....did you ask something, only i cant hear you because i have my electronic ear defenders on

Answer 6

idk