CAE-USC V2.3 AIMs Audio Scene Description

1     Function	2     Reference Model	3     Input/Output Data
4     SubAIMs	5     JSON Metadata	6     Profiles
7     Reference Software	8     Conformance Texting	9     Performance Assessment

1     Functions

Audio Scene Description (CAE-ASD):

Receives	Space-Time	Audio Scene’s Space-Time.
	Audio Object	Input Audio Object.
	Audio Scene Descriptors	Possible Audio Scene to be augmented.
Computes	Audio Objects	Inside the input Audio Object.
	Audio Scene Geometry	Possible Audio Scene to be augmented.
Adds	Audio Scene Descriptors	To make the new Audio Scene.
Produces	Audio Scene Descriptors (output)	The augmented Audio Scene.

Unlike CAE-ABS that can only describe an Audio Scene composed of Audio Objects, CAE-ASD can describe an Audio Scene in terms of Audio Objects and Audio Scenes. In their turn, Audio Scene can be composed of Objects and Scenes.

2     Reference Model

Figure 1 depicts the Reference Architecture of the Audio Scene Description AIM.

Figure 1 – The Audio Scene Description (CAE-ASD) AIM

3    Input/Output Data

Table 1 specifies the Input and Output Data of the Audio Scene Description AIM.

Table 1 – I/O Data of the Audio Scene Description (CAE-ASD) AIM

Input	Description
Space-Time	Audio Objects Space-Time information.
Audio Object	Multichannel Audio (with associated Microphone Array info)
Audio Scene Descriptors	Input Audio Scene Descriptors
Output	Description
Audio Scene Descriptors	Output Audio Scene Descriptors

4     SubAIMs

Audio Scene Description (CAE-ASD) is a Composite AIM with the structure depicted in Figure 2.

Figure 2 – The Audio Scene Description (CAE-ASD) Composite AIM

The specification of the CAE-ASD Basic AIMs are provided at the links of Table 2.

Table 2 – BASIC AIMs of Audio Scene Descriptors

AIW	AIMs	Names	JSON
CAE-ASD		Audio Scene Description	File
	CAE-AAT	Audio Analysis Transform	File
	CAE-ASL	Audio Source Localisation	File
	CAE-ASE	Audio Separation and Enhancement	File
	CAE-AST	Audio Synthesis Transform	File
	CAE-ADM	Audio Descriptors Multiplexing	File

5     JSON Metadata

https://schemas.mpai.community/CAE1/V2.3/AIMs/AudioSceneDescription.json

6     Profiles

No Profiles.

7     Reference Software

8     Conformance Testing

Table 2 provides the Conformance Testing Method for the CAE-ASD AIM. The Conformance Testing Method for the individual Basic AIMs of the CAE-ASD Composite AIM is provided by the individual Basic AIMs.

If a schema contains references to other schemas, conformance of data for the primary schema implies that any data referencing a secondary schema shall also validate against the relevant schema, if present and conform with the Qualifier, if present.

Table 2 – Conformance Testing Method for CAE-ASD AIM

Receives	Space-Time	Shall validate against Space-Time Schema.
	Audio Object	Shall validate against Audio-Object Schema. Audio Data shall conform with Audio Data Qualifier.
	Audio Scene Descriptors	Shall validate against Audio Scene Descriptors Schema.
Produces	Audio Scene Descriptors	Shall validate against Audio Scene Descriptors Schema.

9     Performance Assessment