DASM Anechoic Room – The most advanced sound absorption room in Vietnam

An independent third party (a client who previously built a similar testing room for the VinSmart brand) stated that the quality of the DASM Anechoic Room reaches the highest tier in Vietnam: a background noise level below 8dB during the day and only around 2dB at night.

Designed and constructed by a team of doctors of science and leading experts in acoustics using top-tier materials, the DASM Anechoic Room has been praised by an independent third party (a client who previously built a similar testing room for the VinSmart brand) for having the highest quality in Vietnam. The background noise level of the sound absorption room at the DASM Institute of Acoustics Materials Research and Application is below 8dB during the day and only around 2dB at night.

This is also an extremely fascinating space at the Institute, often dubbed as "the quietest room in Vietnam". 

Anechoic Room – the "essence" of DASM

In most product quality inspections through acoustic analysis, we need a truly quiet environment with a very low background noise level: about 10-20dBA or lower. Under this condition, the sound emitted from the items being tested will not be mixed with other ambient noise from the environment, ensuring optimal measurement accuracy.

This anechoic laboratory environment is usually created by a room called an Anechoic Chamber (sound absorption room, or sound insulation room/non-reflective room). As a place to conduct advanced testing, characteristic of the acoustic research field for materials and acoustic environments, the Anechoic Chamber is applied to test the sound volume and sound quality of products. It creates a single one-way sound field. This means waves only travel outward and there are no reflected waves in the room. Therefore, the walls of the Anechoic Room have a special structure: both resisting low-frequency fluctuating sound sources and completely absorbing the energy of existing internal sound sources at 100Hz and above. Furthermore, the environment in the Anechoic Chamber is very quiet with a background noise level ranging only between 10-20dBA. These two factors make the room an indispensable element in acoustic analysis. 

With a closed structure, the walls of the Anechoic Room are assembled from single Pyramid foam wedges made of PE (pressed foam pad) or Melamine Foam. We can easily cut, shape, and design these two types of materials into desired forms (depending on their position in the room and changing according to the direction of contact with sound). They are utilized in Full Anechoic rooms worldwide, universities, and major audio companies such as B&K, Siemens, Boeing, Airbus, etc. The acoustic characteristics of materials determined from experiments or using modeling include porosity, flow resistivity, tortuosity, thermal characteristics, etc. Determining the sound absorption capacity of this structure is based on the JCA model, PTMM, FEM, and material acoustic characteristics. 

Sound intensity

Typically, an acoustic testing room has a basic background noise level from 10-20 dBA – suitable for most acoustic quality tests for loudspeakers, machinery, household appliances, etc. The human ear can only detect sounds with an intensity greater than 0dBA. When in a room with very low or negative noise, humans can easily become disoriented and experience quite a few psychological problems.

The DASM sound absorption room was meticulously designed and constructed by the team of doctors of science and leading acoustic experts from the DASM Institute itself, using top-tier materials supplied by Remak. It can be said that this is the crystallization of DASM's intellectual essence and dedication. Especially since the Anechoic Room was reviewed by an independent third party (a client who previously built a similar type of room for the mobile phone and tablet manufacturing and distribution brand VinSmart) as the highest-tier testing room in Vietnam. The background noise level of the sound absorption room at the DASM Institute of Acoustics Materials Research and Application is below 8dB during the day and only around 2dB at night. With no reverberation time (RT60), the DASM Anechoic Room absorbs up to 99% of sound.

Applications of the sound absorption room

The sound absorption room is commonly used to test noise and sound emitted from various products with high scientific reliability.

The Anechoic Room in Building 87 at Microsoft's headquarters in Redmond, Washington, USA is currently recognized by the Guinness World Records as the quietest room in the world, with measured ambient noise at -20.35 dBA, 20 decibels below the human hearing threshold. Microsoft uses the sound absorption room for audio devices: microphones, receivers, headphones, speakers, and to analyze clicks and hums from computing devices: keyboards, mice, fans, backlight modules on monitors/touch screens. Among the products benefiting from the Anechoic Room are the Surface tablet line, the Xbox gaming console, and HoloLens VR glasses. Additionally, there is software where the acoustic component is dominant such as Skype, the virtual assistant Cortana, etc.

Meanwhile, the Orfield Labs sound absorption room (Minneapolis, Minnesota, USA) is the only independently recognized testing laboratory in the United States. Therefore, it attracts a wider variety of businesses and products: medical defibrillators, sleep apnea machines, hearing aids, heart valves, household appliances, auto parts, computers, and hard drives, etc. Manufacturers rely on Orfield Labs for product testing and development. For example, companies like Harley Davidson use the laboratory to create quieter motorcycles that still sound like a Harley. Or LED screens are tested to ensure their volume is not too loud. "In fact, NASA uses a similar lab to test its astronauts, because that space is like a giant anechoic chamber," said Steven Orfield, President of Orfield Labs.

Microsoft's sound absorption room

Orfield Labs sound absorption room (Minneapolis, Minnesota, USA)

In Vietnam, customers/businesses with the need to test the sound quality and volume of products, household appliances such as washing machines, air conditioners, refrigerators, etc.; check the operating noise of motors, engines, etc.; check the engines of vehicles such as motorcycles, etc., please contact the DASM Hotline for answers, consultation, and booking services. At the DASM Anechoic Room – "The quietest room in Vietnam", our experts will conduct testing and certification accurately, scientifically, independently, and transparently at competitive prices and satisfy all your desires!

 

An Nhiên/ DASM