Reverberens/echo is a phenomenon that has to do with time.
Hard surface has difficulty absorbing the sound and reflects much of it instead. This can at worst be a very unpleasant sound environment.
In schools, kindergartens, meeting rooms, canteens, gyms and churches it can not only be difficult and annoying to hear what is said, but the noise picture can become a dangerous problem.
So how do we measure this? Well in the time it has for noise emitted to be reduced by 60 dB. This can be measured with instrument, but also calculated with a formula called Sabine's Formula: T = 0.16 x V / AT is the time, V is the volume in cubic meters and A is the sum of the various surfaces in m2 multiplied by the absorbency of the materials ( someone knows a lot about).
In meeting rooms and where people work, we would preferably stay in about 0.6 seconds. In some places we want a little longer reverberation - for example with harmony in concert halls and the like, where levels can lie between 1.5 - 2.0 seconds, so the experience is not obscured by short tones. Therefore, one can plan well with regard to materials you use, and in the situation is that in case of unfortunate conditions, change of use or renovation there are a number of good aids to regulate this.
Overview of noise absorbers for reduction of resonance and noise in rooms.
To reduce noise within the same room, we often use plates of either acoustic foam or fiber with exceptionally high capacity to absorb noise. These reduce reverberation and reduce overall sound levels. Great use in schools, kindergartens, meeting rooms, canteens, restaurants, cafes, home theaters, music studios, industrial halls, etc. Here we show a brief overview of the most important products.