Equal-loudness contour (등청감 곡선)

Equal-loudness contour (등청감 곡선)

등청감 곡선은 우리가 느끼는 소리의 크기를 나타낸 phon 곡선으로서 기준 톤은 1Khz입니다. 이 그래프는 18~30세의 정상 청각 보유자에 대해 적용할 수 있는 규격입니다.

(출처: http://en.wikipedia.org/wiki/Equal-loudness_contour)

An equal-loudness contour is a measure of sound pressure (dB SPL), over the frequency spectrum, for which a listener perceives a constantloudness when presented with pure steady tones. The unit of measurement for loudness levels is the phon, and is arrived at by reference to equal-loudness contours. By definition, two sine waves of differing frequencies are said to have equal-loudness level measured in phons if they are perceived as equally loud by the average young person without significant hearing impairment.