What is an anechoic chamber? what's its function?

What is an anechoic chamber? what's its function?

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Update time : 2022-06-30 17:48:50
An anechoic chamber is a special laboratory used for acoustic testing, also called an acoustic laboratory. It can be used to measure the sound absorption coefficient of sound absorbing materials and sound absorbing structures. Measure the noise level power level of equipment and products. Frequency response characteristics of electrical components such as microphones and speakers. Measurement of acoustic frequency characteristics and noise levels of musical instruments or precision instruments.

To put it simply, it is a special room used to test the noise with extremely low decibels. It is used for automobiles, electronic products, audio, musical instruments and other products to test the noise level. It is equivalent to measuring how loud a product is in a silent room. When you stay in the anechoic room, you can clearly hear your own breathing and heartbeat. If you have a chance, you can try it.

In practical industry applications, it is divided into a full anechoic room and a semi-anechoic room. The anechoic room, like an ordinary room, is a cube with 6 faces. In the design process, all the 6 sides need to be muffled, which is called a full anechoic room. If the ground or roof is not covered, then only five or four sides need to be muffled, which is called a semi-anechoic room.

Seeing this, I believe everyone should have a certain understanding of the anechoic room. You only need to know that it is a special room for testing product noise.

The functions of the anechoic chamber are mainly reflected in the following points:
➢Free field space: Free field means that when sound waves propagate in infinite space, there are no reflectors and reflecting surfaces; the main function of the anechoic chamber is to provide a semi-free field space for acoustic testing.

➢Background Noise: Another function of the anechoic chamber is to provide a low background noise loop test environment. In the test frequency range, the sound pressure of the background noise is 6dB(A) lower than the sound pressure level of the sound source under test, preferably 12dB(A).

➢Cutoff frequency: In the design of anechoic chamber, the lowest frequency with the wedge sound absorption coefficient of 0.99 is usually called the cutoff frequency. When the sound absorption system on the wall can ensure a sound absorption coefficient of 99%, it can ensure that the anechoic chamber above the cutoff frequency can meet the free field conditions. For measurements below the cutoff frequency, correction measurements can be made according to the standards of IS03746 and IS03747.


Anechoic chamber structure:
Outer double-sided steel-plastic sandwich sound insulation panel, outer bottom shock absorber, outer wall profile frame, inner six-sided steel-plastic sandwich sound insulation board,The interlayer cavity of the inner and outer rooms is filled with sound insulation cotton, board seam sealant, sound absorption wedge mounting frame, pneumatic translation sound insulation door, ventilation muffler, sound source bracket, test platform, etc.

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