Download Nachhallzeit app for Android

Nachhallzeit app download for Android, Echo time is an audio parameter of the echo frequency in a room. To measure, the drop in sound pressure level after a short loud noise (paper bag blasting or clapping hands), the time it takes for the sound to dissolve by 60 dB is called echo time.

With this app, the reverberation time of the room can be measured.

When you set "80 dB = loud" and "20 dB = quiet" you can also say the following: echo time is the time that elapses before no loud noise was previously observed.

In a classroom in a school or lounge in a daycare center, the echo time should be about 0.6 seconds.

The target value depends slightly on the volume of the room: 180 m3 = 0.55 sec / 360 m3 = 0.65 sec.

The value of 0.6 seconds applies to a room occupied by students or children.

Because of people's absorption, the rebound time of the empty room is longer.

For an empty room, the target value is 0.75 seconds instead of 0.6 seconds.

For hearing-impaired children or adults with tinnitus, another 20% of target rebound times can be deducted.

For comparison: in a room for the use of music, the echo time should be 1.1 seconds, in churches the value is more than 2 seconds.

Echo time is too long:

In a room every word resonates louder. Moreover, the previously spoken word still resonates when the following words are pronounced.

They literally interrupt each other.

The speaker tries to speak louder to improve the intelligibility of speech, which makes the room louder.

Echo time is too short:

Children who are spoken to face to face understand well what is being said. Due to the excessive sound absorption in the room, the words on the side and especially the rear could no longer be heard adequately.

You feel "not treated".

This can be compensated for by raising the volume, but it will result in a hoarse sound in the speaker.

Echo time measurement:

It should be quiet in the room before and during the measurement. The measurement is caused by loud applause or the explosion of a paper bag.

The selected value of the echo time is displayed immediately.

If the statistical evaluation is successful, a green circle appears.

The average value from 3-5 measurements should be used for evaluation.

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