Measure the sound insulation between two rooms. Do this by generating a sound in a room, and by comparing this sound level with the level measured in a, normally adjacent, room.
Airborne and impact noise are distinguished as follows.
Airborne noise is sound that is transmitted through the air,
such as traffic noise or people talking in the room next door.
Impact noise is produced when walls or floors vibrate,
due to footsteps, slamming doors, moving furniture, water pipes, etc.
The process of calculating the SRI or the STC may also require that the background noise and the Reverberation Time RT60 are measured.