The measurement principle is simply to create a measured noise in the first room (the sending room) and compare that to a simultaneous measurement in the second room (the receiving room).
Such a relative airborne sound insulation measurement quantifies the ability of the walls, floor, ceiling, windows, doors, or even ventilators to absorb noise between the sending and receiving rooms.
In some cases the "sending room" is not a room at all, rather the source is generated outside the building and measured through the facade in the receiving room situated inside the building.
In order to measure the airborne sound insulation, the determination of the background sound level as a single broadband value or several values across the frequency spectrum may be required.
Airborne sound insulation measurement
For impact sound insulation measurement (structure-borne noise), a calibrated Tapping Machine is used to generate the noise by knocking on the floor. (a calibrated rubber ball can also be used).
A sound level meter in the room below records the noise level and calculates the desired results.
Depending on the standard, measurement of the reverberation time may also be required in determining the impact sound insulation.
Impact sound insulation measurement