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About the application:

With this apk, the reverberation time of a room can be measured. The reverberation time is an acoustic parameter for the reverberation of a room. To measure the drop in sound pressure level is measured after a short loud noise (pop a bag or clap your hands once). The time it takes for the sound to decay by 60 dB, is called the reverberation time. When assignment "= 80 dB loud" and "20 dB = quiet" you can also say this: The reverberation time is the time that elapses until you no longer observe a previously loud noise. In a classroom at school or a in a nursery school, the reverberation time could be about 0.6 seconds. The desirable value is slightly dependent on the volume of the room: 180 m³ = 0.55 s / 360 m³ = 0.65 s. The value of 0.6 seconds is considered for a full room with students or kids. Due to the absorption of the bodies, the reverberation time of an empty room is higher. For an empty room the reverberation time could be 0.75 seconds, instead of the 0.6 seconds for a full room. For hearing-impaired kids or adults with tinnitus the nominal reverberation time can be reduced by 20%. For comparison: In a room, which is used for melody, the reverberation time could be 1.1 seconds, in churches, the value is 2 seconds or higher. The reverberation time is too long: In a live room every word sounds louder. Furthermore, a previously spoken word is still audible when the following words are spoken. They talk across each another. To improve the speech intelligibility the speaker speaks louder. Thus, it becomes even louder in the room. The reverberation time is too short: Children, standing directly in front of the speaker, understand the spoken words well. Due to high sound absorption in the room, on the side and particularly in the rear place of the speaker, the words are awful to hear. The kids do not feel addressed. This can be compensated by speaking louder, but this leads to hoarseness of the speaker. Measurement of the reverberation time: Before and during the measurement, it must be quiet in the room. The measurement is triggered by a loud clap or popping of a paper bag. The determined value of the reverberation time is displayed immediately. After a successful statistical evaluation, a green circle appears. For evaluating the average of 3-5 measurements could be used.