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NBN ISO 21727:2021
Cinematography — Method of measurement of perceived loudness of short duration motion-picture audio material
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Summary
This International Standard 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.
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.
Technical characteristics
| Publisher | Bureau de Normalisation Belge (NBN) |
| Publication Date | 05/13/2021 |
| Page Count | 1 |
| EAN | --- |
| ISBN | --- |
| Weight (in grams) | --- |
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