Noise Reduction Testing

I am always willing to help with something that benefits the health and protection of other people.  In this experiment at Salford University Acoustics department I was subjected to loud white noise with and without the hearing protection used on board helicopters.

The test was to determine the attenuation of the noise when active noise reduction was applied to the helmet.

The noise reduction system seemed to affect the frequency content of the noise, filtering out a lot of the low end, which would be incredibly useful for avoiding the sound of spinning helicopter blades.

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