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Contact UsOverview of ARIB Technical Report (TR-B32)
1. Overview
| TR Number | ARIB TR-B32 |
|---|---|
| Technical Report Name | Operational Guidelines for Loudness of Digital Television Programs |
| General Description | This technical report summarizes the items to be considered in the operation of the average loudness value and the true peak value in digital television broadcasting. This technical report is applied to the audio signal of all full-packaged programs to be produced, transported, exchanged and played-out in digital television broadcasting. Here, the program refers to a general program or CM. |
2. Amendment History
| Ver. | Amendment or Enactment Date | Amendment summary |
|---|---|---|
| 1.6 | 03.25.2025 | Addition of the algorithm for measuring the average loudness value of program audio produced using the object-based audio system, as well as the points to be considered when measuring. |
| 1.5 | 09.29.2016 | ARIB STD-B59; Three-dimensional Multichannel Stereophonic Sound System for Programme Production was revised in July,2016. To follow above, this technical report is revised to add to weight coefficient for the labels of 7.1 channels, and add to Check Signals for 22.2 channels and 7.1 channels. Furthermore, this technical report is revised to stipulates the correction value for gain of pre-filter is corresponded with 997Hz sine wave, but not 1kHz sine wave, and to make modifications for the purpose of unification and the clarification of the term. |
| 1.4 | 12.03.2015 | A conventional measuring method for sounds up to 5.1ch defined in Rec. ITU-R BS.1770-3 is expanded to the measuring method for three-dimensional sounds exceeding 5.1ch defined in revised Rec. BS. 1770-4. To follow above, this technical report is revised to meet exceeding 5.1 channels. |
| 1.3 | 07.03.2015 | This is to clarify the measuring method of the average loudness level when a sound mode is monophonic. |
| 1.2 | 12.10.2013 | This is to clarify that the purpose of this report is to truly specify the management of the program by the average loudness level and the true peak level. And a short time measurement mode is beyond the scope of the report. A meter characteristic and requirements described in Rec. ITU-R BS.1771 is added as information under the positioning of "reference materials." |
| 1.1 | 03.19.2013 | This technical report specifies the operation based on loudness measurement algorithm specified in Rec. ITU-R BS.1770. By using a loudness meter based on this specification, the average loudness level of the sound of the whole program is obtained. And the level is kept uniformity to optimize the sound level difference of the programs. When the audio level management by loudness is started, a method is required to confirm weather loudness meter is based on the algorithm specified in this report. This revision is to specify seven kinds of check signals which enable to confirm operation check by measuring them with a loudness meter and compare them with expected values. |
| 1.0 | 03.28.2011 | Enactment |
