1, Muz0 series noise reduction products have many modes. Originally, the sensor would capture the vibration caused by external noise, then convert it into a signal and send it to the anti-vibration circuit for processing. The electromagnetic system will judge the direction of noise vibration according to these signals, release the original vibration, and finally achieve the effect of low noise elimination.
2. From passive noise reduction to active noise reduction. Since the industrial revolution, human beings have been constantly innovating on the road of fighting noise. At first, we could only chase and intercept noise in a "defensive" way. From thick walls and glass, plus thick soundproof cotton to isolate or absorb noise in a large range, to earmuffs and earplugs to resist noise. Passive noise reduction can mainly fight against high-frequency noise, but the isolation effect of low-frequency noise will be greatly reduced, such as the roar of aircraft or automobile engines.
This passive noise reduction method was used for a long time until the birth of active noise reduction technology. The concept of active noise reduction was put forward by Dr. Amar G. Bose, the founder of Bose, on a plane trip because he couldn't stand the noise of the plane. If you use active noise reduction headphones in flight, you must have experienced the feeling that the low-frequency roar was suddenly isolated at the moment of noise reduction. Sound propagates through vibration. The principle of active noise reduction is to collect the vibration waveform of noise through the sensor outside the earphone, and then generate the reverse vibration waveform through the sound generating unit inside the earphone to "neutralize" the noise. Obviously, it is different from the "prevention" form that only relies on passive noise reduction in the past. Active noise reduction ANC "attacks" by reversing noise neutralization, which greatly weakens the spread of low-frequency noise.
3. More complex noise reduction artifact: silent cockpit technology. Noise control is carried out locally, and earphone noise reduction is actually a relatively simple application scenario. The most advanced active noise reduction headphones only need to use the sound insulation bag/earplug for passive noise reduction, then measure the noise waveform at a single point, and then "neutralize" the noise in a single sound generating unit of the headphones.