Acoustical Terms : Sound, decibel, Reverberation, Frequency, Impact Sounds - Printable Version

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Acoustical Terms : Sound, decibel, Reverberation, Frequency, Impact Sounds - navya mathur - 08-14-2014

Acoustical Terms

Sound: a vibration or wave motion that can be heard, reaches the ear through air, the air vibrates back and forth in tiny molecular motions of high and low pressure

Decibel: the unit of measurement used to indicate the loudness or intensity of sound; comparable to the “degree” as a measurement of heat or cold

Reverberation Sounds: airborne sounds which continue after the actual source has ceased, caused by reflections from floors, walls and ceilings

Frequency: rate at which sound energized air molecules vibrate

Impact Sounds: sounds that are carried through the building by the vibrations of the structural materials themselves

Masking Sounds: normal sounds within habitable rooms which tend to “mask” some of the external sounds entering the room

Decibels Reduction: expression used to indicate the sound insulating properties of a wall or floor panel

Sound Transmission Loss: STL, the number of decibels which sound loses when transmitted through a wall or floor

Sound Absorption: capacity of a material or object to reduce sound waves by absorbing them, these sounds are otherwise reflected and cause excessive reverberation and build up of intensity within that area

Noise Reduction Coefficient: NRC, the sound absorption of acoustical materials is expressed as the average percentage absorption at the four frequencies which are representative of most household noises, these frequencies are 250, 500, 1000, and 2000 cycles/second

Sound Transmission Class: STC, single number which represents the minimum performance of a wall or floor at all frequencies, the higher the STC number, the more efficient the wall or floor will be in reducing sound transmission.

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