LOUDNESS LEVEL
The loudness level of a sound is measured by making a subjective comparison between the LOUDNESS of the sound and that of a PURE TONE of specified frequency that seems equally loud. The SOUND PRESSURE LEVEL of the pure tone in PHONs is then called the loudness level of the sound.
See: EQUAL LOUDNESS CONTOURS. Compare: HEARING LEVEL, NOISE LEVEL, PERCEIVED NOISE LEVEL, SOUND LEVEL, SOUND POWER LEVEL.
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