Active noise reduction (ANR) is a rapidly developing technology that is particularly useful in reducing low-frequency noise. The Wyle Acoustics Division has been developing this technology over the past several years and envisions ANR as a solution to some of the community noise problems faced at commercial airports and military air bases.
- Noise from aircraft operations at commercial airports continues to be a source of annoyance to the local community.
- Wyle Acoustics Group has recently developed methods for controlling jet noise through active noise reduction (ANR) or "anti-noise."
- This technology allows a sample of the noise to be electronically processed and fed through loudspeakers in "anti-phase" so as to cancel the offending noise.
This technology is particularly adapted to:
- Maintenance testing of engines (run-ups).
- Reduction of low-frequency noise generated behind departing aircraft.
Some of the advantages of an ANR system:
- Allow airlines to conduct engine maintenance operations 24 hours a day.
- Less expensive than a fixed hush-house or pen runway facility.
- More effective than noise barriers.
- Allows greater flexibility in selection of run-up locations.
Recorded field demonstration of an active noise reduction system
(Higher Quality, Enhanced Format)
(Lower Quality, Standard Format)
Download MP3 Player:
(Hint: For best results, you should playback the MP3 file with a set of full range loudspeakers, preferably with a subwoofer)