The longer you live in a city, the more you feel it's a luxury to enjoy a moment of peace. ANC active noise reduction is a kind of noise reduction technology, and it is one of the methods applied in earphone noise reduction. The active noise reduction function is to neutralize the noise by producing the reverse sound wave which is equal to the external noise by the noise reduction system, so as to achieve the effect of noise reduction. Recently, a residential building less than 100 meters away from my dormitory was rebuilt and started. It was on time at 7:00 every day; it was sudden; even wearing Shanghai ear plugs could not help the mechanical collision. I was upset when I thought of the construction site. Just after the double eleven, a terrible idea came to mind: I probably need an ANC active noise reduction headset.
ANC active noise reduction headset
Noise reduction means different from that in acoustics and photography, but we mean noise reduction (DB) to the intensity that the human ear can not detect. The principle of active noise reduction is that all sound consists of a certain spectrum. If one sound can be found, its spectrum is exactly the same as the noise to be eliminated, but the phase is just the opposite, it can completely cancel out the noise. Noise reduction headphones, which can eliminate environmental noise naturally, also provide users with a quiet listening environment for music. There are many noise reduction earphones on the market, including passive noise reduction earphone and active noise reduction headset, and the main role of this paper is the latter. However, this paper is not to recommend specific active noise reduction headphones, but to everyone Amway a practical and fashionable active noise reduction headset.
What is the best way to reduce noise?
The greatest advantage of noise reduction technology in headphones is to protect the user's hearing. The active noise reduction headset selects high performance Φ 13 acoustic driving unit and the leading multilayer polymer crystal to meet the material diaphragm, which can fully show thicker bass, brighter and wider high-level effect, and greatly reduce acoustic distortion and achieve high fidelity sound effect. Although the main role of this paper is active noise reduction earphone, even passive noise reduction headphones can play a role in protecting hearing. Yes, you're not wrong. Noise reduction technology can protect your listening. Many people have a misunderstanding about headphones, that is, hearing more headphones can damage listening. In fact, what really affects the user's listening is that the volume is set too high during the process of listening to music.

Imagine what can you do to hear music in noisy buses and subway cars and the sound insulation of headphones is not very good? Of course, turn the volume up. In fact, many people cover up the environment with high volume. Every time I hear the sound of the passenger headphones floating around the noisy bus, I would like to say to the brothers: your ears will suffer irreversible hearing damage if you go on. So, to listen to music at normal volume, the best way to do this is to isolate the noise from our ears through noise reduction. If the volume is normal, listening to music with headphones will not bring much burden to the ears.

Active noise reduction
Active noise reduction is just the opposite, it has no way to high-frequency noise, but the noise reduction of medium and low frequency is indeed strong. The active noise reduction headset selects high performance Φ 13 acoustic driving unit and the leading multilayer polymer crystal to meet the material diaphragm, which can fully show thicker bass, brighter and wider high-level effect, and greatly reduce acoustic distortion and achieve high fidelity sound effect. Compared with simple and rough passive noise reduction, active noise reduction technology is a lot of black technology. It uses the phenomenon of acoustic interference, and actively emits the anti phase sound wave with the same amplitude as the external noise, so that the two can cancel each other, so as to achieve the effect of noise reduction.
Tips: earphone soundproof test method. The active noise reduction headset selects high performance Φ 13 acoustic driving unit and the leading multilayer polymer crystal to meet the material diaphragm, which can fully show thicker bass, brighter and wider high-level effect, and greatly reduce acoustic distortion and achieve high fidelity sound effect. You can listen to the earphone you think is appropriate at the end of the night, and record the volume. Then, when you use it in the noisy environment of bus or subway, if you don't need to improve the volume and listen to the music content, your earphone sound insulation is very ideal. If you need to improve the volume to hear clearly, it is recommended to replace the earphone with better sound insulation capability or buy an active noise reduction headset.
Active noise reduction ≠ noise insulation passive noise reduction
As mentioned above, noise reduction is divided into passive and active. Passive noise reduction is actually sound insulation. Passive noise reduction earplug can isolate external noise through slow rebound sponge or silica gel earmuff, so that a closed space is formed in the ear canal. Passive noise reduction earphones are commonly used in professional monitoring earphones. These earphones not only have good sound insulation performance, but also are very comfortable to wear, and playback sound quality is also very good. However, passive noise reduction can only reduce environmental noise, but not eliminate them. And passive noise reduction is more effective to isolate high-frequency noise, but the low and medium-frequency noise is a bit unstoppable.
The specific method is that the microphone collects the environmental noise, and then submits it to the noise reduction system for analysis and calculation. Finally, the anti phase sound wave is generated by the loudspeaker to eliminate the environmental noise. Active noise reduction may occur in a quiet environment