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Why does music linger naturally and dialogue remain clear and unobtrusive? The key lies in precise control of reverberation time. This article will discuss reverberation time control techniques.
Reverberation time refers to the time it takes for the sound pressure level of the diffuse sound field in a room to decay by 60dB after the sound source stops emitting sound. Its control technology is mainly based on the Sabine formula: T60 = 0.161V/A = 0.161V/αS
T60 is the reverberation time (s); V is the room volume (m3); A is the total sound absorption (m); S is the total area of the sound absorber (m); α is the average sound absorption coefficient of the sound absorber
Sound absorption and noise reduction is a tool for controlling reverberation time. Indoor background noise can be treated by sound absorption to change the reverberation time, thereby reducing the sound pressure level of the noise in the reverberant sound field.
The difference in sound pressure level before and after treatment is: △Lp=10lg (Tafter/Tbefore). The calculated value of the relationship between the reverberation time ratio before and after sound absorption treatment and the noise reduction amount is as follows:
As a core indicator of indoor sound quality, hall reverberation time (RT60) primarily impacts the subjective listening experience in terms of clarity, fullness, warmth, and sense of space. Excessively long reverberation results in muddy and indistinct sound; moderate reverberation results in a clear, rich, and dynamic sound; and short reverberation results in a dry and unmusical sound.
By adjusting the type, area or position of the sound-absorbing and diffusing materials, the reverberation time can be precisely controlled, ultimately achieving the goal of reducing environmental noise and improving the acoustic environment.
So what standard should the reverberation time of the hall be controlled at?
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