USB Device Class Definition for Audio Devices
Release 1.0 March 18, 1998 v
Table of Contents
Scope of This Release.........................................................................................................ii
Contributors.........................................................................................................................ii
Revision History ..................................................................................................................ii
Table of Contents................................................................................................................v
List of Tables....................................................................................................................viii
List of Figures...................................................................................................................xiii
1 Introduction................................................................................................................14
1.1 Scope....................................................................................................................14
1.2 Purpose.................................................................................................................14
1.3 Related Documents ...............................................................................................14
1.4 Terms and Abbreviations.......................................................................................14
2 Management Overview...............................................................................................17
3 Functional Characteristics.........................................................................................18
3.1 Audio Interface Class.............................................................................................18
3.2 Audio Interface Subclass and Protocol...................................................................18
3.3 Audio Synchronization Types.................................................................................19
3.3.1 Asynchronous .................................................................................................19
3.3.2 Synchronous...................................................................................................19
3.3.3 Adaptive .........................................................................................................19
3.4 Inter Channel Synchronization ...............................................................................19
3.5 Audio Function Topology .......................................................................................20
3.5.1 Input Terminal ................................................................................................21
3.5.2 Output Terminal..............................................................................................21
3.5.3 Mixer Unit.......................................................................................................22
3.5.4 Selector Unit...................................................................................................22
3.5.5 Feature Unit....................................................................................................23
3.5.6 Processing Unit...............................................................................................23
3.5.7 Extension Unit ................................................................................................28
3.5.8 Associated Interfaces......................................................................................28
3.6 Copy Protection.....................................................................................................28
3.7 Operational Model .................................................................................................29
3.7.1 AudioControl Interface ....................................................................................30
3.7.2 AudioStreaming Interface ...............................................................................31
4 Descriptors .................................................................................................................36
4.1 Device Descriptor ..................................................................................................36
4.2 Configuration Descriptor ........................................................................................36
4.3 AudioControl Interface Descriptors.........................................................................36
4.3.1 Standard AC Interface Descriptor....................................................................36
4.3.2 Class-Specific AC Interface Descriptor ...........................................................37
4.4 AudioControl Endpoint Descriptors ........................................................................57
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