So what is a noise cancelling headset ? What is the difference between noise reduction headphones and general headphones? I believe that many ordinary users are more curious in the end what is a noise canceling headphones? The following small series on specific to everyone to talk about what is noise reduction headphones?
[What is a noise reduction headset]
Noise reduction headphones are mainly divided into two types: one is automatic noise reduction headphones, and the other is forced noise reduction headphones. The so-called automatic noise reduction earphone refers to a reverse sound wave that is leveled with external noise through a noise reduction system, neutralizes the noise, and then completes the noise reduction. Automatic noise canceling headphones are equipped with noise reduction circuits that counterbalance external noise. Most of them use a bulky head-mounted design. They can use the structure of ear plugs, cotton, and earphone housings to block outside noise and perform the first round of sound insulation. In order to have enough space to install automatic noise reduction circuit and power supply.
The other type is forced noise cancelling headphones. The so-called forced noise canceling headphones are mainly used to close the space around the ears. Generally choose silica gel earplugs and other noise materials to hinder the external noise, because the noise has not been processed by the noise reduction circuit chip, usually only high-frequency noise can be isolated, the low-frequency noise noise reduction effect is not obvious.
The three noise reduction methods that are usually used to reduce noise, namely noise reduction at the sound source, noise reduction at the transmission process, and noise reduction at the human ear, are all negatively forced. In order to actively eliminate noise, the "active noise reduction" technology was invented. The principle of this technique is that all sounds are composed of a certain spectrum. If a sound can be found, its spectrum is exactly the same as the noise to be eliminated. Only the opposite phase (180° out of phase) can completely eliminate the noise. Offset. The practice of source silencing is in practice "using poison to attack poison."
[Noise reduction earphone principle]
Noise-reducing headphones use automatic noise control, which is different from the normal sound-proofing of headphones. The principle is:
1. Detect low-frequency noise (100 to 1000Hz) in the environment that can be heard by the ear from the microphone placed in the earphone.
2. The noise signal is then transmitted to the control circuit and the control circuit performs real-time operation
3. Echoes the noise by Hi-Fi horns emitting acoustic waves of the same phase and amplitude as the noise
4. As a result, the noise disappeared.
[Noise-canceling headphones for the crowd]
First, business people. Because they travel frequently and need to reciprocate every day between business people in different cities, they must be the most annoyed of the noise in the cabin. If there is a noise reduction headset, it can effectively block the noise disturbance, restore a pure music world, and let the mind and body To relax.
2, subway workers. Daily crowded subway workers are probably accustomed to the noise in the subway. However, if there is a pair of noise cancelling headphones at this time, not only can they avoid noise disturbances, but they can also adjust their mood through headphones to make the mind in the world of music. It was relaxed and maintained a pleasant mood.
3, office family. For people sitting in the office to work, they often think about plans. At this time, they need a pure and tranquil environment to clarify their thinking. At this time a pair of noise canceling headphones is very necessary.
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