What is active noise cancellation in headphones

Thanks to modern technology, manufacturers equip headphones with unusual, but very important characteristics. Thus, in this article we will analyze one of them. We learn by what principle it acts and what features it has.

What does active noise reduction mean?

Technology itself entered the consumer market relatively recently. But in a short period of time has gained a significant reputation. Of course, you should first understand what the named ability is. First of all, this is the elimination of extraneous sound, which sometimes makes it difficult to play various audio recordings. Of course, it is impossible to fence off all undesirable factors. However, the device performs its purpose correctly.

Moreover, if you pay attention to more modern models that are equipped with the present ability, then it is in them that you can feel in a quiet room. Therefore, this method helps the user not only fight silence, but also refuse excessive volume in the outside world.

It is important to note that high frequencies, for example, an annoying squeak or any whistle, the system can turn into a normal hiss, characterized by calm and its insignificance. Of course, those vibrations that have a frequency of more than 100 Hz cannot be suppressed, since it is perceived not only by the ears, but also directly by the body.

REFERENCE! In addition to active action, passive is distinguished. A distinctive feature of the first from the second is the presence of some add-ons: a microphone, a battery and an audio processor.

How does the noise reduction system work?

Efficiency is carried out by applying a special sound that is pre-generated. Accordingly, due to this, the surrounding noise is just suppressed. In addition, special microphones are built into the product. They are responsible for measuring the noise level in the nearest district. And the whole system is explained by the following sequence of actions:

• The first thing that is captured is the sound that will be further suppressed by others.
• After that, a sound wave with a similar amplitude is produced.

ATTENTION! The phase of the original sound at this stage is accurately mirrored.

• At the end, two streams are mixed, thereby suppressing each other. Thus, the principle is based solely on physics: any sound can create for itself a display that smooths the original one (acts exclusively in antiphase).

The presented technology is really able to cope with excess sound, the range of which is in the range from 100 Hz to 1 KHz. That is, the conversation of strangers, the characteristic sounds from passing cars or from the street can easily be “crushed”. However, it is important to understand that along with so many positive aspects, there are negative ones. For example, the fact that such a concept is not suitable for everyone.

There is a small percentage of people who are completely contraindicated in the use of these products. With prolonged use, certain headaches may occur. This is due to the fact that some people suffer from intolerance to active suppression technology.

IMPORTANT! Another disadvantage is the pressure exerted on the eardrum.

This is due to the presence of "anti-noise", which enters the ear with music or another recording. Thus, you should first check for portability of this system so as not to spend extra money.