Sennheiser PXC 360 BT Instructions for Use - Page 6

PXC 360 BT NoiseGard™ The NoiseGard 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 electronics use this noise to generate a sound wave which is the exact opposite (IE: at the same level but polarity reversed - 180° out-of-phase), the effect being that the polarity reversed signal cancels most of the outside noise. TalkThrough The PXC 360 BT headphones have a TalkThrough function, which allows you to communicate with other people without having to remove the headphones. When TalkThrough is activated, professional quality microphones mounted on the outside of the headphones pick up all acoustic signals in the immediate vicinity. Annoying background noise is electronically filtered out, only allowing the voice of the other person to pass through the headphones clearly. Additional features • Great for travel: comfortable, rugged and foldable headphone construction • Optional connection via audio cable for music enjoyment without Bluetooth technology • Outstanding sound quality due to Duofol diaphragms • Optimum protection against ambient noise due to active and passive noise attenuation 5