Knowledge point: An anechoic chamber refers to a room without reflection. The walls of the anechoic chamber are covered with sound-absorbing materials with good sound absorption performance, and the sound absorption coefficient reaches more than 99%.

In modern society, sound is everywhere in our lives, and even noise is an indispensable part of human life. However, the existence of sound is not all good without any harm. When testing professional audio products, audio companies usually conduct noise tests in professional anechoic chambers. An anechoic chamber refers to a room without reflection. The walls of the anechoic chamber are paved with sound-absorbing materials with good sound absorption performance, and the sound absorption coefficient reaches more than 99%. Therefore, there will be no reflection of sound waves in the room.

Anechoic chamber is a more important experimental site in acoustic experiments and noise tests. Its function is to provide a low-noise test environment in a free field or semi-free field space, and adopt good sound insulation and seismic isolation devices to avoid interference from the external environment. In the professional audio and lighting industry, it is a special place for testing audio equipment such as speakers and speaker units. The sound absorption performance of general sound-absorbing materials is a function of frequency. The lower the frequency, the worse the sound absorption performance. The high-frequency sound absorption performance of sound-absorbing materials is better. However, the wavelength of high-frequency sound waves is short, and the brackets and networks for placing the tested parts in the anechoic chamber scatter the sound waves more.

Anechoic chambers are used for noise control, sound insulation and vibration prevention projects in urban civil buildings, air-conditioning rooms, garages, exhibition halls, hotels, restaurants, shopping malls, supermarkets, hospitals, office buildings and other places. Sound design, construction and installation projects for recording studios, photo studios, performance halls, concert halls, theaters, cinemas, piano rooms, teaching and research rooms, multi-function halls, gymnasiums, conference rooms and other buildings. Sound insulation projects such as various types of soundproof doors, soundproof windows, soundproof rooms, soundproof enclosures, soundproof screens, etc. Laboratories, anechoic chambers, anechoic boxes, simultaneous interpretation rooms, hearing test rooms and various electronic, electrical, medical, mechanical equipment, power engines, aircraft engines and other ultra-quiet and noiseless laboratory projects.