ISO 21727:2004

Cinematography — Method of measurement of perceived loudness of motion-picture audio material ISO 21727:2004

Publication date:   Sep 24, 2004

Scope

ISO 21727:2004 specifies a method of measurement of motion-picture sound that allows assessment of the subjective loudness and annoyance of the sound recording when replayed at the recommended replay level in rooms aligned with the characteristics of ISO 2969. The specified method of measurement assesses the entire duration of the sound recording with suitable channel summation, frequency weighting and time integration.