Flight Training - November/December 2022 - 15

HOW IT WORKS
BY SARAH DEENER
CANCELED
ACTIVE NOISE REDUCTION HEADSETS FIGHT SOUND WITH SOUND
GENERAL AVIATION AIRCRAFT COCKPITS
are noisy places. Fortunately, the
headsets we use to communicate over
the radio and with others on board the
airplane also help quiet the din of a noisy
engine (or two).
There are two basic types of aviation
headsets: passive noise reduction and
active noise reduction (ANR), commonly
called noise-canceling. Passive
headsets block ambient noise using the
ear cup as a physical barrier, whereas
ANR headsets use microphones, processors,
and speakers to counter that
noise electronically. Superior noise
reduction can preserve hearing, reduce
flying fatigue, and increase comfort, but
the advantages come at a price: Passive
headsets can be found for a couple hundred
dollars, but ANR headsets often
run more than $1,000. For many pilots,
it's worth the investment.
ANR headsets " cancel out " noise with
sound that is effectively its opposite. A
microphone in the ear cup senses the noise
around you, electronics in the headset
process the noise, and a speaker delivers
a sound that is the same frequency but
opposite amplitude.
Remember that sound travels in
waves that vibrate the eardrum and
are processed by the brain. The opposite-phase
sound produced by ANR
anti-noise speakers has peaks where the
other sound has troughs, dampening its
energy and significantly reducing the
sound that reaches your ear. That helps
guard against hearing loss from long
periods of flying, makes radio transmissions
easier to hear, and results in less
clamping than passive headsets because
the headset relies less on the physical
barrier and seal of the ear cups.
ANR technology is most effective
with lower frequency, continuous
sounds such as engine noise, which
makes these headsets especially suited
to aviation. The sound is reduced, but
not completely eliminated, so pilots
should still notice changes to engine
rpm or other sounds that may indicate a
developing problem.
sarah.deener@aopa.org
Speaker
Microphone
Processing
electronics
FLIGHT TRAINING NOVEMBER/DECEMBER 2022
15
STEVE KARP

Flight Training - November/December 2022

Table of Contents for the Digital Edition of Flight Training - November/December 2022

Contents
Flight Training - November/December 2022 - Intro
Flight Training - November/December 2022 - Cover1
Flight Training - November/December 2022 - Cover2
Flight Training - November/December 2022 - Contents
Flight Training - November/December 2022 - 2
Flight Training - November/December 2022 - 3
Flight Training - November/December 2022 - 4
Flight Training - November/December 2022 - 5
Flight Training - November/December 2022 - 6
Flight Training - November/December 2022 - 7
Flight Training - November/December 2022 - 8
Flight Training - November/December 2022 - 9
Flight Training - November/December 2022 - 10
Flight Training - November/December 2022 - 11
Flight Training - November/December 2022 - 12
Flight Training - November/December 2022 - 13
Flight Training - November/December 2022 - 14
Flight Training - November/December 2022 - 15
Flight Training - November/December 2022 - 16
Flight Training - November/December 2022 - 17
Flight Training - November/December 2022 - 18
Flight Training - November/December 2022 - 19
Flight Training - November/December 2022 - 20
Flight Training - November/December 2022 - 21
Flight Training - November/December 2022 - 22
Flight Training - November/December 2022 - 23
Flight Training - November/December 2022 - 24
Flight Training - November/December 2022 - 25
Flight Training - November/December 2022 - 26
Flight Training - November/December 2022 - 27
Flight Training - November/December 2022 - 28
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Flight Training - November/December 2022 - 30
Flight Training - November/December 2022 - 31
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Flight Training - November/December 2022 - 55
Flight Training - November/December 2022 - 56
Flight Training - November/December 2022 - Cover3
Flight Training - November/December 2022 - Cover4
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