ISO 21727:2016
Cinematography — Method of measurement of perceived loudness of short duration motion-picture audio material
ISO 21727:2016 specifies a method of measurement of short duration 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, typically commercials and trailers that do not exceed 3 min in length, with suitable channel summation, frequency weighting and time integration. It does not specify a maximum recommended level for such material and is solely aimed at describing a measurement method.
NOTE Typical recording and replay levels are discussed in Annex A.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Method of measurement
4.1 General
4.2 Procedure
4.2.1 Input calibration and M-type frequency weighting
4.2.2 Scalar channel summation
4.2.3 Loudness-equivalent level
4.2.4 Calculation
Annex A (informative) Typical recording and replay levels
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Method of measurement
4.1 General
4.2 Procedure
4.2.1 Input calibration and M-type frequency weighting
4.2.2 Scalar channel summation
4.2.3 Loudness-equivalent level
4.2.4 Calculation
Annex A (informative) Typical recording and replay levels
Bibliography