NoiseGard – This
is how it works
The NoiseGard™ technology developed by Sennheiser
is used in many cockpits all over the world. It is
based on the principle that unwanted low-frequency
noise can be eliminated by adding phase-inverted
anti-noise. Fot this, small microphones (usually
in the ear cups) pick up the ambient noise. The NoiseGard™ electronics
then generate an identical signal – but phase-inverted
by 180°. Thus the two noise signal waves cancel each
other out to a very large extend, and music can be
enjoyed to the full.
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