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1. reverberation


ETYM cf. French réverbération.
The act of reverberating; especially, the act of reflecting light or heat, or echoing sound.
In acoustics, the multiple reflections, or echoes, of sounds inside a building that merge and persist a short while (up to a few seconds) before fading away. At each reflection some of the sound energy is absorbed, causing the amplitude of the sound wave and the intensity of the sound to reduce a little.
Too much reverberation causes sounds to become confused and indistinct, and this is particularly noticeable in empty rooms and halls, and such buildings as churches and cathedrals where the hard, unfurnished surfaces do not absorb sound energy well. Where walls and surfaces absorb sound energy very efficiently, too little reverberation may cause a room or hall to sound dull or “dead”. Reverberation is a key factor in the design of theaters and concert halls, and can be controlled by lining ceilings and walls with materials possessing specific sound-absorbing properties.

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