Other Applications of Active Noise Cancellation
There are many applications of active noise cancellation. These applications include quieting industrial fans, heating, ventilation and air conditioning ducts, vehicle exhaust, the interior of cars, the inside of air craft including the SAAB 2000 and the Dash 8-Q400, submarines, and headphones. The headphones are widely in use commercially for music, for pilots, passengers, and air traffic controllers, as well as US Army tanks crews.
Noise
Canceling
Headphones on a Plane
Good models can
usually cut sound in higher frequencies passively by 15-20 decibels and
another 10-20 decibels in lower frequencies by using active noise
control. This helps makes active noise cancellation headphones well
suited
for airplanes.