In a room with refl ecting walls and objects the sound pressure does not decay that much and the sound field in a certain distance from the source becomes more or less diffuse, that means that due to the many reflections the sound waves come from all directions.
A simple model for calculating the sound pressure level in a closed space is using:
Sound pressure level:
Room constant:
More advanced calculations can be performed with acoustical programs using e.g. ray tracing and mirror source techniques. Those programs need detailed information about the room geometry and sound absorbing and reflecting properties of all surfaces. Normally those programs will only be used by qualified acoustic engineers.
A leading application is the ODEON Software, where it is possible to build up various scenarios and simulate the acoustic properties within the room / area. World leading marine acoustic consultancy company Ødegaard & Danneskiold-Samsøe is widely using this application and can simulate engine room scenarios, dining room in cruise liners, living quarters on platforms, muster stations, etc.
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