Active noise cancellation in headphones: how it works

Modern technologies have made it possible to develop such a system thanks to which the external noise is completely blocked when listening to music in the headphones. This is important, first of all, for the safety of using headphones, and the second important aspect is quality improvement. How the system works, let's try to figure it out.

Headphone Noise Reduction

Today, manufacturers provide almost every such accessory with a named advantage. However, upon acquisition, it is desirable to know the principle of the performance, as well as possible negative consequences. Indeed, with the help of the presented isolation, all external sounds cannot be prevented, but it fulfills its purpose quite properly. Below we will analyze why so.

What is it for, what is useful

It is preliminary recommended to deal with the definition. First of all, this is an option to eliminate interfering noise by applying a certain sound that is initially generated. Thus, the user of this device can play audio files and videos, while unwanted rustles (a passing car, street sounds, an outside conversation, etc.) will not interfere activities. It is especially convenient to use when visiting a crowded place, metro.

ATTENTION! If you select a high-quality model of equipment, then when using it it is possible to feel in an absolutely empty room, even if you are in a noisy space at this moment.

In addition, some developers give users the opportunity to use the built-in amplifier in the suppression. And this means that with the functionality of the system as a result, the most high-quality sound can be formed.

How it works

All activity is based solely on the laws of physics. Sound waves are simply reflected and absorbed. That is, the system captures noise and creates a similar connection with the same amplitude, but with the opposite phase. Thus, the two components are mixed, due to which each other is suppressed. Moreover, the whole procedure is accomplished thanks to external microphones that are built in from the inside. They are needed in order to measure the degree of surround sound. Accordingly, using this mechanism, you can protect yourself from excessive volume. But the popularity of such a system did not immediately increase. Initially, it was used only in the aviation and defense industries.

IMPORTANT! With prolonged continuous operation, negative consequences can be noticed. To understand them in more detail, it is worth paying attention to the following aspects.

• The most common complaint from users is a headache. This is due to the constant pressure of sound waves on the eardrum. Therefore, some people may have intolerance to active suppression.
• A feeling of nausea is created due to exposure to the vestibular apparatus. During operation, you yourself are deceiving your own brain: when walking, the body realizes that it is in a state of motion. However, the hearing organs convey the opposite situation to the brain.
• In use, headphones suppress most low frequencies, bass. Along with external sound, certain basics in reproduced music can also be isolated.