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School class acoustics

19.07.2010

Engineers and physicists examined the acoustics in two hundred empty classrooms in Berlin schools.

In each class, a balloon was blown up and pierced with a pin, recording the resulting pop and its echo. If the echo lasts no more than half a second, such acoustics, according to the German standard, is considered good for rooms in which teaching is conducted. But only 15% of the surveyed classes met the standard.

In some cases, the echo lasted more than three seconds, making the teacher's speech completely unintelligible. Such conditions are especially difficult for children with impaired hearing and for those whose German is not their native language. Classrooms with poor acoustics will have to be refurbished with sound-absorbing wall and furniture finishes.

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