NOISE MITIGATION

NOISE REDUCTION

Purpose Sound insulation is another form of mitigation. This screen demonstrates the effectiveness of differing levels of structural noise insulation. How to Use Noise Reduction
	The TV set that shows on the pop-up screen can be turned on or offby clicking on the TV icon. The up down arrows are used to set volume. Alternate sound sources can be selected using the Sound Source drop down menu. The speaker icon starts and stops the sounds of an overflight that is accompanied by an animation. The amplitude of the source can be modified using the up down arrow controls that appear in the "Outdoor dB" box at the right side of the display.
	The row of boxes at the bottom that show "dB" are used to select among noise level reductions. Click on one of those NLR boxes to select it. The display includes a TV set that can be set to a comfortable listening level. Then a flyover can be initiated for a selected aircraft. NLR can be changed on the fly. The "Receiver Inside/Outside" selector toggles between indoor and outdoor states.
(The TV sound is stopped for the outside setting). Note that the NLR is achieved by adjusting the amplitude of a sound as well as the frequency content. In an outdoor/indoor change, high frequency content is diminished more than the low frequencies. The "Info" button at the lower left of the display triggers a pop-up text/graphic image providing details on how the various NLRs can be achieved. As the reduction level is increased, the number of noise insulation strategies multiply. The graphic has a hypertext format. A click on any of the noise reducing actions pictured at the top of the display will jump to the relevant position of the text. Alternatively, the scroll bar can be used to navigate through the text and pictures.

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