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This Document Has Been Superseded
A newer publication replaces it: BSI BS 6951, BSI BS ISO 226
Normal equal-loudness contours for pure tones and normal threshold of hearing under free-field listening conditions
REAFFIRMED IN 1999
Specifies, for the condition of equal loudness and certain other stated conditions, relationships between sound pressure levels and frequencies of pure continuous tones.
These are expressed by means of a bilinear equation for the preferred frequencies in the one-third octave series from 20 to 12500 Hz.
A graphical illustration is included.
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