Reverberation can be defined as the persistence of sound after it has been produced. A sound formed in a large-sized hall will be reflected from the walls repeatedly until it is decreased to the point where it is not audible. Excessive reverberation is highly unwanted in an auditorium or large-sized hall. To reduce reverberation, the ceiling and walls in the auditorium are typically covered with sound-absorbent materials such as compressed rough plaster and fiberboard.
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Important Questions with Answers
1. What are the effects of reverberation?
Speech intelligibility (the measure of speech comprehensiveness) may be affected by reverberation. And also, by adding a sense of space, reverberation enhances the naturalness of the recorded sound.
2. What if the reverberation time is too long?
The reverberation time of a room or a hall is defined as the time the sound takes to decay by 60 dB. If the sound takes 6 seconds to decay from 100 dB to 40 dB, then the reveberation time is 6 seconds. When the reverberation time is too long, it produces an echo. We will hear a distinct echo when the reverberation time is long.
3. What are the characteristics of reverberation?
- The surfaces of objects in the space, such as a wall, furniture, or air, can cause many reflections.
- Reverberation is the arrival of reflections in less than 50 milliseconds.
- Reverberation is the persistence of sound after it has been produced.
4. What are some of the advantages of reverberation?
Sound depth increases without changing pitch when the rightr amount of reverberation is present. Reverberations work wonders in musical symphonies and orchestra halls. It makes music sound better.
5. What is the application of reverberation?
Live and recorded music producers use the reverberation phenomenon to improve sound quality. Several systems for producing and simulating reverberations have been developed.
6. What can we do to reduce reverberations?
Reverberation can be reduced by covering the surface of objects in the enclosed space using sound-absorbing material. For example, mineral wool and fibreglass are porous materials used as absorbents. Sound waves penetrate mineral wool and convert sound energy to heat through friction. In that case, the reflected sound decays much faster, leaving the listener with only the original sound.
7. Is reverberation similar to echo?
The concepts of reverberation and echo are almost similar. They are both time-based audio effects caused by sound reflection on hard surfaces. The persistence of sound after the sound source has been turned off is referred to as reverberation. And echo is the sound caused by reflections of sound waves from the surface back to the listener.
9. How do we measure reverberation?
A sound level metre and a loudspeaker can measure reverberation time. Similarly, it can compute the reverberation time using Sabins’ formula. We use the volume of the room and the surface materials to calculate the Sabin values. To calculate reverberation, first, compute the Sabinvalue for each surface; total absorption is obtained by adding the Sabin values.
10. What are the disadvantages of reverberation?
The sound running together in excessive reverberations becomes garbled. Suppose a room lacks sound-absorbing surfaces such as roofs, walls, and floors, sound bounces back between them. In such a room, the listener appears unable to analyse the speaker because he hears both direct and repeated reflected sound waves.
11. Which device can be used to estimate sound?
Sound can be estimated with a device called a decibel metre.
Practice Questions
- What is the intensity of a sound?
- What are the properties of sound?
- What is reverberation time?
- What is reflection?
- The sound unit is _______.
- kilometre
- decibel
- metre
- none of the above
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