Almost classroom in school were not designed acoustically. Its difference with home entertainment room, home theater room, karaoke room, or other audio room designed well acoustically. When someone speaks in a classroom and the other speaks in an acoustic room will be heard difference.

Acoustic Room Performance standards are defined for the following:
? Indoor ambient noise levels from external sources and building services defined on a room classification basis
? Airborne sound insulation between spaces
? Impact sound insulation of floors
? Reverberation within teaching and study spaces
? Sound absorption requirements for corridors, stairwells and entrance halls
? Speech intelligibility requirements in open plan spaces

Unfortunately classrooms currently suffer from poor room acoustics. We think that classrooms do not need an acoustic audio sound. While an acoustic effect needed when study process.

The science behind poor acoustics.

Why are some rooms acoustically poor?
There are a number of factors to take into account when analyzing the acoustics in any one room, the following play a major part in creating a poor acoustic environment.
? Too much reverberation
? Sound from other rooms penetrates the walls
? Flutter echoes

What is reverberation?
Reverberation is the persistence of a sound after its source has stopped, resulting in poor speech intelligibility in rooms.

The effect of reverberation on speech.
Decreases the overall understanding of speech.
Vowels interrupt the understanding of lower loudness consonants. Vowels tend to be 10-15 dB louder than consonants.
Silent intervals between syllables, sounds and words are filled with reflective energy resulting in a smearing effect of the sound.

Ways to reduce reverberation time.
In order to reduce reverberation time, you need to increase the absorption in the room. Absorption can be increased by the replacing of covering hard surfaces with softer ones to minimize the amount of reflection.