The PHON scale was devised to express this subjective impression of loudness, since the DECIBEL scale alone refers to actual sound pressure or sound intensity levels. Historically, the A, B, and C ...
Because the square of the sound pressure is proportional to SOUND INTENSITY, SPL can be calculated in the same manner and is measured in DECIBELs. Two SPL measurements in decibels may be combined with ...
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