What is TWS headphones

Noise-canceling headphones, what are noise-canceling headphones? In fact, the literal interpretation is headphones that can reduce noise, and noise reduction headphones can be divided into "active noise reduction" and "passive noise reduction" headphones. Noise-canceling earphones can eliminate environmental noise, provide a quiet and peaceful listening environment for earphone users, and can avoid the behavior of having to increase the music volume due to the interference of environmental noise, which protects the hearing of human ears to a certain extent.

Passive noise reduction:

Before talking about active noise reduction, let's talk about passive noise reduction first. Passive noise reduction is a combination of plastic, foam, woven mesh and other composite materials to achieve pure physical noise reduction methods, such as the US military headsets we often see on TV, or those used by airport ground crews The headphones with oversized earmuffs are basically passive noise-cancelling headphones.

Passive noise reduction headphones mainly rely on good airtightness and material characteristics to keep noise out, but passive noise reduction generally can only target higher frequency sounds above 500Hz, especially for noises above 1KHz, which are mostly closed Earphones will show a certain degree of passive noise reduction ability, but if you want to get a better noise reduction effect and deal with low-frequency noise, you need to pay a great price (the research of materials science is a big project!) Passive noise reduction is incapable of many low-frequency noises, which has contributed to the development of active noise reduction.

The protection principle of noise-canceling headphones

Knowing the principle of noise damage to hearing, then we can start from the principle and analyze how noise-canceling headphones protect our hearing. Let's leave the early noise-cancelling headphones aside for the time being. In principle, modern noise-cancelling headphones can be roughly divided into two working principles: "active noise reduction" and "passive noise reduction". Of course, the two working principles do not conflict in principle, so earphone products that use active noise reduction schemes often also take into account the function of passive noise reduction.

Let's talk about passive noise reduction first: In essence, there is no essential difference between passive noise reduction and "covering your ears". It mainly starts from the perspective of sound propagation and sound acceptance. As mentioned earlier, sound waves are transmitted through air vibration, so as long as we block the sound waves before they pass into the ears, then we can easily isolate the noise hazards. In terms of earphone products, in the past, in a noisy environment, in order to hear the contents of the earphone clearly, we often needed to adjust the earphone volume to a very high level.

Although we turn up the earphones loudly to cover the surrounding volume, higher volume levels can still damage our auditory hair cells. Passive noise-cancelling earphones isolate the noise from the earphones, allowing us to hear the content played in the earphones at a lower volume. This is how passive noise-cancelling earphones "protect hearing" work.