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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 constant loudness when presented with pure steady tones.
More at Wikipedia
Audiometry
Audiogram
More related topics
CCIR (ITU) 468 Noise Weighting
dB(A)
Listener fatigue
Pure tone audiometry
Hearing
Audio engineering
Acoustics
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