NetNews Usenet Archive 1992 #27/NN_1992_27.iso/spool/comp/dcom/telecom/11887

Internet Message Format | 1992-11-15 | 1.6 KB

Path: sparky!uunet!think.com!sdd.hp.com!zaphod.mps.ohio-state.edu!news.acns.nwu.edu!telecom-request
Date: Sun, 15 Nov 92 14:24:03 CST
From: [e-mail] (Todd Lawrence)
Newsgroups: comp.dcom.telecom
Subject: Re: Airphones -- Phooey!
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Someone referring to the Airphone stated that they were using noise
cancelling mikes. Actually to the best of my knowledge none that I
have had the opportunity to use seemed to have any kind of active or
passive ("hole in the back") noise cancellation schemes however, as a
Pilot for USAir, I can give a few facts:

1) The typical noise level in a cabin class aircraft using bypass
turbofans (quiet engine, ie.. B757), or even turbojet (noisiest
version of commercial jet engine (ie b737-100 series) is quite low.
This would not require any noise cancellation at all.

2) The noisier commuter type aircraft, cabin class turboprop such as
emb-120 (Brasilia) are not equipped with airphone systems since for
the most part trips on such aircraft are of a short duration and
installing such a system would be "cost innefective".

For the most part, I have been happy enough to use these phones for
their intended purpose, to place a call that really can't wait until I
get onto the ground.


Todd Lawrence    [e-mail]    uunet!valinor!todd