This is a five-part series on Active Noise Reduction in
General Aviation. It came about because hundreds and hundreds of you have been
asking good questions about ANR technology and its advantages in airplanes. This
series is intended to provide G.A. pilots with a fairly technical and thorough
understanding of this technology and the important criteria that will affect
performance and long term satisfaction While not exhaustive, you should
"graduate" with a clear picture of the role active cancellation can have on your
flying safety, comfort and overall enjoyment.
Here is the structure of this five-part series of articles:
1: The Basics of ANR...a review of how active noise reduction works
and the design variables involved; why it's so difficult to design a really
effective ANR headset, even though the basic principles of ANR are rather
2: Acoustic Issues...how to measure, understand and compare the
manufacturer's performance figures and noise cancellation curves...and why
some of the figures you see in headset ads are meaningless.
3: Airplane Issues...the nature of the noise spectrum we're trying to
cancel, and the importance of good low-frequency attenuation.