Usually, noise-cancelling headphones refer custom headphones with logo to headphone products with active anti-interference function. Interference cancellation theory can be simply understood as 1+(-1)=0.
The lively sound-reducing scratches inside the earphones and the noise-reducing process of the front and rear review microphones produce sound waves with the exact same consistency and opposite phase as external noise, neutralizing the noise.
In addition to earbuds, active noise cancellation is also common in industrial manufacturing, high-end cars, and other fields. Active noise cancellation is a “real-time adaptation” noise reduction technology innovation compared to non-active noise cancellation, which isolates additional noise by installing earplugs and the ear canal.
At present, the active noise reduction capability of noise-cancelling headphones is already very strong, and the price of the corresponding headphones with productive anti-interference function is relatively high. The well-known noise-cancelling earplugs can achieve 40db of interference reduction, which is equivalent to 60db, and 40db can be offset by noise reduction, which is equivalent to 30db of extra environmental sound, and 30db can be offset by noise reduction, rather than infinite sound reduction.
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