Reverberation is the persistence of sound in a particular space after the original sound is produced. When sound waves hit a surface, they can reflect off that surface and travel back to the listener's ears, creating a series of reflections that blend together. These reflections continue until they lose enough energy to be inaudible, and this effect is known as reverberation.
Whenever a sound pulse is produced in the room or auditorium, the waves received by the listener are combined effect of direct waves and reflected waves. Due to this the sound persist for sometime even after the source has stopped producing the sound. This persistance of sound is known as reverberation.
The time gap between the direct note and reflected note upto the minimum audibility level is called reverberation time. It is often denoted as RT60, is a measure of how long it takes for the sound level in a room to decrease by 60 decibels (dB) after the sound source has stopped. It is a crucial parameter in room acoustics and is used to characterize the reverberant properties of a space.
A room with a long reverberation time will have a more pronounced echo and a lingering sound, while a room with a short reverberation time will sound drier and more absorbent. The ideal reverberation time for a specific space depends on its purpose. For example, concert halls often have longer reverberation times to enhance musical performances, while recording studios typically aim for shorter reverberation times to capture a cleaner sound.
Reverberation is a natural phenomenon that occurs in various environments, such as rooms, concert halls, and auditoriums. The characteristics of reverberation, including its duration and intensity, depend on the size, shape, and acoustics of the space in which it occurs. Different surfaces and materials can also influence the way sound waves reflect and create reverberation.
When a series of notes are produced in the auditorium each note will give rise to its own intensity curve with respect to time. For clear audibility of speech or music
(i) each separate note should give sufficient intensity of sound in every part of auditorium
(ii) each note should die down rapidly before the maximum average intensity of next note is received by the listener in the case of speech, for music comparatively more reverberation are tolerated.
In audio engineering and music production, reverberation is often used intentionally to add a sense of space and depth to recorded sounds. Reverberation effects can be simulated using digital signal processing techniques and added to recordings to create a desired acoustic environment or artistic effect. This is commonly done using electronic devices called reverberation units or reverb effects processors.
Controlling and manipulating reverberation is crucial in various fields, including architecture, acoustics, audio engineering, and music production, to create pleasant and immersive auditory experiences.
References:
1. A text book of sound, N. Subrahmanyam Brijlal, Vikas publishing house pvt ltd.
2. Properties of matter, R. Murugeshan, S chand and company Ltd.
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