ISO/IEC 23003-4:2020

Information technology — MPEG audio technologies — Part 4: Dynamic range control

This document specifies technology for loudness and dynamic range control. It is applicable to most MPEG audio technologies. It offers flexible solutions to efficiently support the widespread demand for technologies such as loudness normalization and dynamic range compression for various playback scenarios.

Technologies de l'information — Technologies audio MPEG — Partie 4: Contrôle de gamme dynamique

General Information

• Status: Published
• Publication Date: 03-Jun-2020
• ICS: 35.040.40 - Coding of audio, video, multimedia and hypermedia information
• Technical Committee: ISO/IEC JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information
• Drafting Committee: ISO/IEC JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information
• Current Stage: 9092 - International Standard to be revised
• Completion Date: 08-Feb-2024

Relations

• Amended By: ISO/IEC 23003-4:2020/Amd 2:2023 - Information technology — MPEG audio technologies — Part 4: Dynamic range control — Amendment 2: Loudness leveling
• Effective Date: 02-Jul-2022
• Amended By: ISO/IEC 23003-4:2020/Amd 1:2022 - Information technology — MPEG audio technologies — Part 4: Dynamic range control — Amendment 1: Side chain normalization
• Effective Date: 21-Aug-2021
• Revises: ISO/IEC 23003-4:2015 - Information technology — MPEG audio technologies — Part 4: Dynamic Range Control
• Effective Date: 02-Jun-2018
• Revises: ISO/IEC 23003-4:2015/Amd 2:2017 - Information technology — MPEG audio technologies — Part 4: Dynamic Range Control — Amendment 2: Reference software
• Effective Date: 02-Jun-2018
• Revises: ISO/IEC 23003-4:2015/Amd 1:2017 - Information technology — MPEG audio technologies — Part 4: Dynamic Range Control — Amendment 1: Parametric DRC, gain mapping and equalization tools
• Effective Date: 02-Jun-2018

Standards Content (Sample)

INTERNATIONAL ISO/IEC
STANDARD 23003-4
Second edition
2020-06
Information technology — MPEG
audio technologies —
Part 4:
Dynamic range control
Technologies de l'information — Technologies audio MPEG —
Partie 4: Contrôle de gamme dynamique
Reference number
ISO/IEC 23003-4:2020(E)
©
ISO/IEC 2020

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ISO/IEC 23003-4:2020(E)

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ii © ISO/IEC 2020 – All rights reserved

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ISO/IEC 23003-4:2020(E)
Contents Page
Foreword . vi
Introduction . vii
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and mnemonics. 1
3.1 Terms and definitions . 1
3.2 Mnemonics . 3
4 Symbols (and abbreviated terms) . 3
5 Technical overview . 4
6 DRC decoder . 6
6.1 DRC decoder configuration . 6
6.1.1 Overview . 6
6.1.2 Description of logical blocks . 7
6.1.3 Derivation of peak and loudness values. 12
6.2 Dynamic DRC gain payload . 16
6.3 DRC set selection . 16
6.3.1 Overview . 16
6.3.2 Pre-selection based on Signal Properties and Decoder Configuration . 17
6.3.3 Selection based on requests . 20
6.3.4 Final selection . 22
6.3.5 Applying multiple DRC sets . 23
6.3.6 Album mode . 23
6.3.7 Ducking. 23
6.3.8 Precedence .
...