BS 3383:1961
Date published:
Normal equal-loudness contours for pure tones and normal threshold of hearing under free-field listening conditions
Frequency range 20 to 15 000 c/s, under stated conditions, relations between sound pressure level and frequency for pure-tones of equal loudness, values for threshold of hearing. For otologically normal persons aged 18 to 25. Correction formulae for otologically normal persons up to 60 years.
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BS 3383:1961
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