Sound Absorption Capabilities

Do you want to avoid noisy ambiance? No doubt everyone loves peace and want to avoid ill timed and unwanted noise. Returning from the office you would always like to avoid unwanted sounds of footsteps or other things. The perfect solution for you is to install Carpet that has good acoustic value. According to studies and various research, floor coverings are good absorbent of sound. The floor coverings control the sound by absorbing airborne sound, reducing surface noise, and minimizing the transmission of noise through floors into other rooms.

Of all the floor coverings, carpet is considered to be the best noise absorbent. The family with adult population in general prefer the carpets that are good at absorbing sound. However selection of proper carpet is necessary. If carpet is selected carefully, it can absorb noise as efficiently as many specialized acoustical materials. It also prevents the sound transmission to rooms below. Thus carpet plays the role of acoustical material that performs the dual role of a floor covering and acoustical aid.

Before buying carpet one should understand the acoustical values of particular carpet constructions and the combinations of specific carpet cushions. The coefficient of sound absorption usually vary strongly with frequency. A noise reduction coefficient (NRC) is applied to grade the effectiveness of a material employed for sound control. Acoustics value is also affected by the nature of the pile-height, cut or looped pile which should be inquired before purchasing.

Noise Reduction Coefficient (NRC) is calculated by averaging the material's sound absorption coefficients at frequencies of 250, 500, 1000, and 2000 Hz. Zero NRC indicates perfect reflection whereas an NRC of 1 indicates perfect absorption. It is expressed to the nearest multiple of 0.05.

The coefficient of sound absorption can be measured by both the normal incident method and the reverberation room method. A noise reduction coefficient (NRC) is applied for using to grade the effectiveness of a material employed for sound control.

There are two types of the sound absorption characteristics.

• In the first category the sound absorption coefficient is small in low frequency range and gradually increases with shifting to higher frequency
• In the second category, there is a peak of sound absorption coefficient in medium frequency range (about 500~1,000Hz).