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IEC 100/1860/NP
Audio reproduction method for normalized loudness level (TA11)
ISO/TC 43/WG 9
Method for calculating loudness level
DIN ISO 226
Acoustics - Normal equal-loudness-level contours (ISO 226:2023)
ISO 21727 AMD 1
Cinematography - Method of measurement of perceived loudness of short duration motion-picture audio material - Amendment 1