
Normal equal-loudness contours for pure tones and normal threshold of hearing under free-field listening conditions.
NORM herausgegeben am 19.5.1961
Designation standards: BS 3383:1961
Note: UNGÜLTIG
Publication date standards: 19.5.1961
Approximate weight : 300 g (0.66 lbs)
Country: British technical standard
Kategorie: Technische Normen BS