Introduction

The Audio Definition Model (ADM) is standardised metadata model for describing the technical properties of audio. ADM metadata can be attached to audio files to ensure the audio is correctly handled. These pages contain information to help you understand the ADM and provide examples and a reference to use it.

Tutorial

Background

If you want to know the backgound behind the ADM, these pages will provide a good starting point:

• What is the ADM? - What the ADM is (and isn't), and why it is needed.
• Different type of audio - Audio has moved beyond just simple channels, these are the different types.
• Rendering - Some types of audio need special processing, this tells what is involved.

Step-by-step Tutorial

The easiest way to build up an understanding of the ADM is to work through the following tutorial pages:

• Overall structure
• Format part
• Content part
• Common Definitions
• Timing
• Dynamic and static metadata

Use Cases

Some exmaple use cases are included to help illustrate how the ADM be used in different ways:

• Foreground/background - Allowing adjust of the background sound.
• Multiple languages - Two approaches for language selection.
• Multiple storylines - Allowing choice of different versions of a story.
• Dynamic mixed - Dynamic object-based audio alongside a channel-based bed.

ADM Reference

The full reference for the ADM specification can be found here:

• ADM elements
• Other ADM related parts