The difference between sound pressure levels in the source and receiving room.
General
The difference between sound pressure levels in the source and receiving room.
When measuring airborne sound insulation between two rooms, we normally do as follows:
- One of the rooms is defined as the source room. In this room we put a signal generator/power amplifier/loudspeaker combination and at least one microphone connected to our analysing system.
- If we use one microphone only, we must make several level measurements at different positions about the room to calculate a spatially averaged sound pressure level. The loudspeaker must also be used in at least two positions otherwise we cannot guarantee that the measured sending room level is representative for the sending room.
- The other room is defined as the receiving room. In here we put at least one microphone which we move about the room to calculate a spatially averaged level even here.
- The excitation signal used is normally pink noise.