Audio Frequency
요약 : Our ears are most sensitive to frequencies around 4kHz
레퍼런스 : http://en.wikipedia.org/wiki/Audio_frequency
dB(Decibel)
설명 : 나중에 정리
http://en.wikipedia.org/wiki/Decibel
http://en.wikipedia.org/wiki/Frequency_weighting
키워드 :volume, 주파수, 볼륨, 소리 크기, 가청 영역
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