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Author: admin | 07.02.2014 | Category: Tinnitus Hearing Loss

Noise cancellation technology designed specifically for helicopter & aircraft pilots and other aircrew - ALPHA active noise reduction (ANR) is in use throughout the world protecting military, civil and commercial aircrews from the damaging effects of aircraft noise. David Clark Company Electronic Noise Cancellation (ENC) a€?X-Seriesa€™ headsets feature the latest advances in active noise reduction technology. A miniature microphone is placed in the ear cup next to the earphone element and as near as possible to the entrance of the ear canal.
An important feature of the product, exclusive to our design, is true "fail-safe" operation.
Our ENC Headset System is manufactured to the same high standards as our conventional headsets.
The research I did concerns developing these secondary canceling sonic sources so that they can be as effective as possible.
One speaker with positioning as shown here creates a "lobe" of destructive space where the fan noise is reduced.

Unlike other crosstalk canceling algorithms, mine uses FFT to separate the filtered signal into 3 frequency ranges and applies an individual delay time for each range.
If you continue without changing your settings, we'll assume that you are happy to receive cookies. Our ENC headsets are specially designed for pilots of aircraft which generate noise at lower frequencies. By having dual earphone drivers, which are electronically independent, no interruption of communication can result from failure of the ENC system or its power source. Superior passive attenuation is combined with state of the art electronic noise cancellation in a product providing exceptional communication clarity. It is important to understand the mechanics of the system you are canceling in order to get a high signal to noise ratio (SNR). Gentex, Argus, ALPHA, ALPHA Eagle, Cromwell, the Cromwell logo, ER1, Pureflo, and Purelite Xstream are registered trademarks of Gentex Corporation or its affiliates.

The signal developed by the sensing microphone represents noise which has penetrated the passive attenuation barrier, and is composed of predominantly low frequencies.
This signal is fed to a circuit where it is inverted in phase, amplified, and then drives an earphone creating an anti-noise signal which cancels the intruding noise. I did work with signal processing to cancel the sound of a small house fan and develop a stereo crosstalk cancellation system. The audio files to the left demonstrate when the mic was placed in front of the fan (low SNR) and when it was more effectively placed to the fan's side (high SNR).
The center and most prominent frequencies are those produced by the blades movement through air so that "hum" is the most important signal to process when canceling.

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