![]() ![]() According to an experiment conducted to test how lightweight earphones reduced noise as compared to commercial headphones and earphones, lightweight headphones achieved better noise reduction than normal headphones. In contrast, other active noise and vibration control products use soft real-time digital processing. Most noise-cancelling headsets in the consumer market generate the noise-cancelling waveform in real time with analogue technology. The opposite sound waves collide and are eliminated or "cancelled" ( destructive interference). When the sound pressure of the noise wave is high, the cancelling wave is low (and vice versa). A microphone captures the targeted ambient sounds, and a small amplifier generates sound waves that are exactly out of phase with the undesired sounds. To cancel the lower- frequency portions of the noise, noise-cancelling headphones use active noise control or ANC. Theory Simplified graphical depiction of active noise reduction Noise-cancelling headphones can improve listening enough to completely offset the effect of a distracting concurrent activity. In the aviation environment, noise-cancelling headphones increase the signal-to-noise ratio significantly more than passive noise attenuating headphones or no headphones, making hearing important information such as safety announcements easier. It can also help a passenger sleep in a noisy vehicle such as an airliner. Noise cancellation makes it possible to listen to audio content without raising the volume excessively. This is distinct from passive headphones which, if they reduce ambient sounds at all, use techniques such as soundproofing. ![]() Noise-cancelling headphones are a special type/kind of headphones which suppress unwanted ambient sounds using active noise control. ![]()
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