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Room size, absorption characteristics - and attenuation in direct sound fields.
Room attenuation in a direct sound field as function of room size and room sound absorption characteristics:
The diagram is based on a listener within 5 ft (1.5 m) from the source.
Typical Rooms and their Absorption Characteristics
- Hard - bath rooms, large churches, gymnasiums, factories
- Average - private homes, concert halls, restaurants, offices, conference rooms, hotel rooms, school rooms, hospitals, libraries, churches, reception rooms
- Soft - radio and TV studios, theaters
Example - Sound Attenuation in an "Average" Room
The sound attenuation in an "average" room with surface 100 m2 (1076 ft2) can be estimated from the diagram above to be approximately
- Room acoustics and acoustic properties, decibel A, B and C, Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity and sound attenuation.
- In a room the sound or noise will reach the receiver as direct and reverberant sound.
- The speed and attenuation of sound in moist air varies with sound frequency and air humidity.
- The attenuation in a room depends on the location of the sound source and the receiver - and the room constant.
- The sound reverberation time indicates how long it takes until the sound pressure level in a room is decreased with 60 dB.
- Mean absorption coefficients and reverberation times in typical rooms.
- Room sound absorption and absorption coefficients for common materials like plaster walls, brickwork, plywood panels and more.
- Sound Pressure is the force of sound on a surface perpendicular to the propagation of sound.
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