Impact sound is generated by traffic contacting the floor surface. Airborne sound inside a room - ambient noise - is generated by impact noise in the room itself. It is therefore also the main area where a floor covering can influence acoustic performance. Acoustic flooring such as carpets and vinyls with underlays is an outstanding floor sound absorptive material. When properly selected, they absorb sound as efficiently as many specialized acoustical materials. No other acoustical material performs the dual role of a floor covering and a versatile acoustical aid.