An anechoic sound is a method of attenuating noise at the source, which is usually done by technical means, utilizing the principle of mutual cancellation or suppression of sound to reduce or eliminate the intensity of noise.
I. Understanding the Principle of Sound Anechoism
The principle of sound anechoism is the interference of sound. Interference is when two or more waves are superimposed in space, their amplitudes add up, and the squares of the amplitudes add up to produce intensity. When two waves are in opposite phases, they cancel each other out, resulting in a silencing effect. This is the basic principle of muffling sound with sound.
Second, there are two main methods of sound muffling passive noise reduction and active noise reduction
1, passive noise reduction: passive noise reduction is by changing the path of sound propagation, such as the use of acoustic materials, change the structural design, etc., to reduce or eliminate the noise. This method is simple and economical, but the effect may not be as good as active noise reduction.
2, active noise reduction: active noise reduction is through electronic equipment to produce and the original noise phase opposite sound waves, so that the two cancel each other out. This method is more effective, but requires the use of electronic equipment, which may increase the cost.
There are five application areas of acoustic noise reduction
1, aerospace
Aircraft and rockets and other aircraft engines can produce huge noise. By using acoustic anechoic technology, these noises can be reduced to a large extent and passenger comfort can be improved.
2, industrial production
Many mechanical equipment in the operation process will produce noise, such as cutting machines, sanding machines and so on. Acoustic anechoic technology can effectively reduce these noises and reduce the health impact on workers.
3, urban planning
Traffic noise in the city is an important factor affecting residents' lives. Through the acoustic silencing technology, soundproof screens can be set up on both sides of the road to reduce the impact of traffic noise on residents.
Concert halls and movie theaters: Acoustic anechoic technology can be used to eliminate echoes and reverberation, improving acoustics and the movie-going experience.
4. Medical field
Acoustic anechoic technology can be used to eliminate noise generated by certain medical devices and improve patient comfort. For example, in the MRI scanning process, the noise generated by the machine can be reduced through acoustic silencing technology, reducing the impact on the patient.
5, environmental protection
Acoustic anechoic technology can also be used to reduce the noise pollution emitted by factories, to protect the quality of life of the surrounding residents.