When a sound is generated at a certain point in space, it will cause a series of sound waves around it. They are centered on the sound source and are free to propagate outward in a spherical layer. When they touch obstacles such as walls and floors, part of them the sound energy is absorbed, and the other part of the sound energy is reflected. The reflected sound wave continues to propagate in the new direction of propagation until the next time the obstacle is hit, a new absorption and reflection is generated.
The sound spreads in the room:
The sound heard in the room is the sum of direct sound and reflected sound.
The sound heard in the room is louder than the outdoor, depending on the strength of the reflected sound, the sum of the direct sound and the reflected sound.
The small reflection sound is called the anechoic chamber (or the environment without sound chamber for professional acoustic testing). The reflected sound is strong, and the sound density of each point in the room is uniform, and the phase difference is irregular. The diffuse sound field laboratory is called the reverberation room.
Reverberation time: The time required for the sound source to be attenuated and the room sound pressure is attenuated by 60 dB after the indoor sound field has stabilized.
Formula: T60 = 0.161V/(S*α)
T: reverberation time (s)
V: room volume (M3)
S: indoor surface area (M2)
α: room average sound absorption coefficient
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