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̶ ʴ Ҹ, Ҹ, ٶ Ҹ Ī̴. ַ ɸ, ο Ͽ
¿Ǵ Ư¡ ִ.
ǥ dB ǥϸ ûļ 20Hz ~ 20KHz̸ ǰ û
20dB ~ 130dB̴. Ư û¿ ļ 3,000Hz ~ 4,000Hz Ҹ̴.
 Ҹ ε ݻǸ鼭 پ Ѵ. Ҹ ļ, Ի簢, β, ġ ޸ Ȳ  ٸ 縦 Ͽ dz ȿ ϰų, ϽŰ ̿Ѵ.
ܺο ϴ 򰡵ȴ. dB m Ŭ, ļ f ũ dB = 20 log m + 20 log f - 23 ǥõȴ. β 2 β ϸ 6dB ϰԵȴ.
ȸȭ ûظ Ͽ Ÿ м ġ NOISE CRITERIA (NC) Ѵ.
NC ȯ
NC 20~30 ſ
NC 30~35 , ȸȭŸ 10MŸ
NC 35~40 ȸȭŸ 4M, ȭϴµ
NC 40~50 ȭŸ 2M, ūҸ 4M ȭ
NC 50~55 ūҸ ȭ 2M, ȭ ,ȸǿ
NC 55 ̻ ſ ò,ȭ
Ҹ
Ҹ Ҹ
200dB ߻Ҹ  
130dB ƮҸ (30M)
120dB ׷ ִ Ѱ
100dB ̿ Ҹ, ڵ  
80dB , ȥ Ÿ  
50dB 繫, ȭ  
30dB Ÿ  
10dB Ҹ  
0dB ִ Ѱ
ú : DECIBEL (dB)
Ҹ
ս : IMPACT INSULATION CLASS (IC)
ٴ̳ õ翡 ս
: NOISE REDUCTION COEFFICIENT
Ư ļ Ǿ Ÿ
0~1.00 ַ ǥϸ 0 ϴ , 1.00 ϴ
1.00 ٴ ǹ
巹 : SOUND LEVEL
 ļ Ҹ ũ⸦ ϴ A,B,CƯ
: SOUND LEVEL METER
ϴ ̴. ũ,,ǥñ ׸ ļ зԾ (PROTOCOL)
: SOUND PRESSURE LEVEL
Ҹ ũ, ϴ dB Ÿ
ս : SOUND TRANSMISSION CLASS (STC)
 ᳪ Ǵ Ư Ÿ з̸ 繫ǿ Ƽǿ ַ
ս : TRANSMISSION LOSS (TL)
 ᳪ dB ҵǾ° ϴ ϴ
Ʈ : SPECTRUM
ļ Ÿ Ҹ Ư
: SOUND ABSORPTION COEFFICIENT
Ҹ Ǿ Ǵ Ȥ ǥ鿡 ݻ簡 Ǵ
Ÿ : OCTAVE BAND
зϱ 鸮 Ҹ ļ 뿪