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Simplified graphical depiction of active noise reduction. To cancel the lower-frequency portions of the noise, noise-cancelling headphones use active noise control.A microphone captures the targeted ambient sounds, and a small amplifier generates sound waves that are exactly out of phase with the undesired sounds.
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NC2 Global is a heavy truck and engine manufacturer that was a 50/50 joint venture of Navistar International and Caterpillar Inc. based in Chicago, Illinois. [1] It was formed in September 2009 to "develop, manufacture and distribute commercial trucks globally, outside North America and India".