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From: iws@rayssdb.RAY.COM (Ihor W. Slabicky)
Newsgroups: rec.aviation,sci.electronics,rec.audio
Subject: Re: Noise-cancelling microphone
Message-ID: <1661@rayssdb.RAY.COM>
Date: Mon, 25-May-87 12:36:10 EDT
Article-I.D.: rayssdb.1661
Posted: Mon May 25 12:36:10 1987
Date-Received: Tue, 26-May-87 01:46:29 EDT
References: <1027@mips.UUCP>
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In article <1027@mips.UUCP>, mark@mips.UUCP (Mark G. Johnson) writes:
> I recently read (in Aviation Week & Space Technology) an article about
> a noise-cancellation system for military pilots' helmets.  Seems that
> military cockpits are _very_ noisy, with helicopter blades whooshing,
> fighter engines roaring, etc, so the pilot can barely hear his/her radio.

In the book, Inside The Aquarium, Viktor Suvorov says that the earphones
of tank crews produce a loud click before the actual firing.  This causes
the eardrum to react to the click and not to the sound of the firing of
the tanks cannon.  The click occurs milliseconds before the firing.