Assignment 7: Room Acoustics
In last week’s assignment, you calculated mean free path, total absorption, and reverberation time for a room that is 4 m long, 7 m wide, and has a ceiling height of 3 m.
The floor is hardwood, = .15 at 500 Hz.
The walls are gypsum wallboard (GWB), = .30 at 500 Hz.
The ceiling is acoustic ceiling tile (ACT), = .95 at 500 Hz.
Using the same room, calculate the following. Scan or photograph your assignment work and submit it.
1. What is the room constant for this room?
2. For a person speaking, what is the critical distance in this room? Use Q = 2.
3. If a person speaking produces a sound power level of 70 dB, how much sound pressure level would you expect at a distance of 3 m?
4. Is this in the direct field or the reverberant field?