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What does anc active noise reduction mean?

2025-01-21 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Internet Technology >

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This article mainly introduces what anc active noise reduction means, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

Anc active noise reduction is a kind of noise reduction technology, and it is one of the noise reduction methods applied in headphones. The three noise reduction measures commonly used in noise reduction, namely, noise reduction at the sound source, noise reduction in the process of propagation and noise reduction at the human ear, are passive.

Active noise reduction is a noise reduction technology, which is one of the methods used in headphones.

The three noise reduction measures commonly used to reduce noise, namely, noise reduction at the sound source, noise reduction in the process of propagation and noise reduction at the human ear, are all passive. In order to actively eliminate noise, people invented the technology of "active noise elimination". Its principle is: all sounds are composed of a certain spectrum, if you can find a sound, its frequency spectrum is exactly the same as the noise to be eliminated, but the phase is just the opposite (a difference of 180 °), the noise can be completely offset. The key is to get the sound that cancels out the noise. The practical method is to start from the noise source itself and try to reverse the phase of the original noise through the electronic circuit. From this point of view, the technology of active noise suppression is actually "attacking poison with poison".

Sound is produced by the vibration of an object, and the transmission form of vibration in the elastic medium is sound waves. Sound waves in a certain frequency range (20~20000Hz) act on the human ear to produce the feeling of sound. Noise is usually defined as "unwanted sound" (unwanted sound), which is an environmental phenomenon. People are exposed to noise all their lives, and noise is also a kind of environmental pollutant produced by various human activities. Vibration is the reciprocating periodic motion of an object (or part of an object) along a straight line or curve and passing through the equilibrium position. It exists widely in nature and engineering.

Since vibration is the source of noise, in the practice of vibration and noise reduction, the problem of noise can be solved effectively by solving vibration. In the common noise control, the vibration of the thin metal plate, such as the pipe wall of the aerodynamic machinery, the outer shell of the machine, the car body and the hull of the ship, are generally made of thin metal plates. when the equipment is running, these thin plates will produce vibration and then radiate noise. the noise caused by the vibration of the metal plate structure is called structural noise. For the effective control method of the radiated noise of the metal plate, one is to reduce the noise radiation area as much as possible to remove the unnecessary metal plate surface, and the other is to apply a damping coating on the metal structure and use damping materials to restrain structural vibration and reduce noise. This method is called damping (vibration damping), which is an active noise reduction technology.

Thank you for reading this article carefully. I hope the article "what is the meaning of anc active noise reduction" shared by the editor will be helpful to everyone? at the same time, I also hope that you will support and pay attention to the industry information channel, and more related knowledge is waiting for you to learn!

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