Sennheiser PXC 350 Instructions for Use - Page 22
NoiseGard Advance, Additional features - noise canceling headphones
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NoiseGard Advance The NoiseGard Advance active noise compensation system is based on the principle of cancelling out sound using "anti-sound" (phase-inverted sound). Tiny microphones pick up low-frequency ambient noise (up to 1 kHz) near the ear. The NoiseGard Advance electronics use this noise to generate a sound wave which is the exact opposite (IE: at the same level but polarity reversed - 180° out-ofphase), the effect being that the polarity reversed signal cancels most of the outside noise. Additional features y Outstanding sound quality due to patented adaptive baffle damping and Duofol diaphragms y Optimum protection against ambient noise due to NoiseGard Advance active noise compensation y Great for travel: comfortable, rugged and foldable headphone construction with single-sided cable y Designed for use with in-flight entertainment systems and audio, video and game consoles y Without the detachable audio cable, the head- phones can be used as passive hearing protectors 5