Use of noise-canceling headphones?

MadsMohr (2010-04-21 11:37:46 +0000)
I just bought a pair of noise-canceling headphones and they are just amazing. But are they allowed in competition? 2i) While competing, competitors must not use sound equipment, other electronic equipment (like walkmans, dictaphones or additional lighting). When turned on they use sound to cancel outside noise but they do not affect anyone other than the person wearing the headphones. Passive ear plugs are allowed but what about active ear plugs? I would be fine with allowing them, but since I own a pair I'm biased.
Ron (2010-05-09 11:31:04 +0000)
@Mads If there is electronics involved it is not allowed.
CorneliusD (2010-05-17 07:10:06 +0000)
I have always used earmuffs at competitions for BLD and saw many other people doing it. [url:2xx3t1ia][/url:2xx3t1ia] It really prevends one from being disturbed.
MadsMohr (2010-05-18 08:50:24 +0000)
[url:3dyl0cos][/url:3dyl0cos] By active they use an external microphone that picks up ambient noise and plays the inverted phase in the speakers to cancel it. The method are both used in headphones, hearing protection and hearing aids.