BS 3383:1961

Normal equal-loudness contours for pure tones and normal threshold of hearing under free-field listening conditions

BSI Group , 05/19/1961

$132.00 $264.16

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.