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Tidbits of Knowledge on Soundproofing
Glossary of Soundproofing Terms
Sound insulation
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Sound insulation is a means of soundproofing by reflecting as much sound as possible.
The smaller the sound leakage from or into a certain space, the higher the sound insulation. Example: Blocking the sound of a piano or stereo from being heard outside the room. Blocking outside sounds from entering a room. Representative sound insulating materials: steel plates, sound insulating sheets, lead sheets, plasterboard |
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Sound absorption
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When sound passes through material with many small holes in it, the sound waves are attenuated. Material that permits large portion of sound to pass through the holes and reflects minimal portion of it is said to have good sound absorbency.
Example: Reducing the echoing of sound in a room Representative sound absorbing materials: glass wool, rock wool, rock wool sound absorbing board |
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Vibration damping
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Vibration damping is a means of reducing vibration in a short period of time to prevent vibration noise.
Example: Stopping the vibration (sympathetic vibration) of air conditioners and refrigerators. Reducing the noise generation of flooring material. Representative vibration damping materials: vibration damping sheets, rubber sheets |
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Vibration proofing
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Vibration proofing is a means of reducing the transmission of vibration.
Example: Reducing the transmission of noise and vibration caused by people walking overhead. Reducing vibration. Reducing the transmission of low pitched sound from stereos. Representative vibration proofing materials: rubber mats, felt |
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Noise Levels in Daily Life
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Faint |
● Ticking of a clock ● Sound of breathing |
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Moderate |
● Air supply sound of an air-conditioner ● Whisper ● Residential area during the daytime |
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Common sounds |
● Alarm clock ● Running water in a stainless steel sink ● A wooden door closing |
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Loud |
● Flush toilet ● Shout ● TV at a high volume ● Radio |
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Extremely loud |
● Disco ● Inside a Karaoke booth ● Inside a noisy factory |
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Painfully loud |
● Beating of a drum ● Rock music ● Thunder nearby ● Under a railroad bridge |
2 units of measurement that express noise level
- dB (decibels)
- dB is a unit of measurement that expresses the level of sound with higher values expressing louder noise. The unit that expresses audible sound to human ears is dB(A).
- Hz (hertz)
- Hz is a unit of measurement that expresses sound frequency. This unit expresses the number of cycles per second. Smaller values express lower frequencies.
