| 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
The Basic Audio Scene Description (OSD-BAD) AIM receives Audio Objects and their Space-Time information and produces the Descriptors of a Scene composed of Audio Objects and optionally an Alert:
| Receives | Space-Time | of the input Objects having the same time base. |
| Audio Objects | Individual Objects. | |
| Produces | Basic Audio Scene Descriptors | Scene Descriptors produced by AIM. |
| Alert | Data concerning potential anomalies in input Object. |
2 Reference Model
The Reference Architecture is depicted in Figure 1.
Figure 1 – The Basic Audio Scene Description (OSD-BAD) AIM
3 Input/Output Data
Table 1 specifies the Input and Output Data of the Audio Scene Description (OSD-BAD) AIM. Links are to the Data Type specifications.
Table 1 – I/O Data of the Scene Description (OSD-BAD) AIM
| Input | Description |
| Space-Time | Space-Time of input Objects. |
| Audio Objects | Input Objects. |
| Output | Description |
| Basic Audio Scene Descriptors | The output Descriptors. |
| Alert | Data concerning potential anomalies in input Object. |
4 SubAIMs
Basic Audio Scene Description (CAE-BAS) is a Composite AIM with the structure depicted in Figure 2.
Figure 2 – The Basic Audio Scene Description Composite (OSD-ABS) AIM
The specifications of the OSD-BAS Basic AIMs are provided at the links of Table 2.
Table 2 – BASIC AIMs of Basic Audio Scene Description
| AIM | AIMs | Names | JSON |
| OSD-BAS | Basic 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-AMX | Audio Descriptors Multiplexing | File |
5 JSON Metadata
https://schemas.mpai.community/OSD/V1.4/AIMs/BasicAudioSceneDescription.json
6 Profiles
No profiles.
7 Reference Software
8 Conformance Testing
Table 2 provides the Conformance Testing Method for OSD-BAD AIM.
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 OSD-BAD AIM
| Receives | Space-Time | Shall validate against Space-Time schema. |
| Audio Objects | Shall validate against Object schema. Media-specific Data shall conform with their Qualifiers. |
|
| Produces | Basic Audio Scene Descriptors | Shall validate against Scene Descriptors schema. |
| Alert | Shall validate against Alert schema. |
