USB Device Class Definition for Audio Devices
Release 2.0
Release 2.0
May 31, 2006
May 31, 2006
1
Universal Serial Bus
Device Class Definition
for
Audio Devices
USB Device Class Definition for Audio Devices
Release 2.0 May 31, 2006 2
Scope of This Release
This document is the Release 2.0 of this device class definition.
Contributors
Geert Knapen (Editor) Philips Applied Technologies
AppTech-USA
1101 McKay Drive M/S 16
San Jose, CA 95131
USA
Phone: +1 (408) 474-8774
E-mail: geert.knapen@philips.com
Mike Kent Roland Corporation
Kaoru Ishimine Roland Corporation
Shoichi Kojima Roland Corporation
Robert Gilsdorf Creative Labs
Daniel (D.J.) Sisolak Microsoft Corporation
Jack Unverferth Microsoft Corporation
Niel Warren Apple Computer, Inc.
Len Layton C-Media Electronics
Mark Cookson M-Audio
Revision History
Revision Date Filename Author Description
1.7 Sep. 3, 02 Audio17.doc USB-IF DWG Initial version. Based on Audio10.doc. This
version will be used to capture the areas
where the spec needs adjustments. Areas
are indicated by comments.
1.7a Oct. 24, 02 Audio17a.doc Geert Knapen Areas are identified where changes need
to be made. Some minor changes already
introduced.
1.7b Oct. 24, 02 Audio17b.doc Geert Knapen Intermediate version
1.7c Dec. 10, 02 Audio17c.doc Geert Knapen Discussions from 12-18-2002 f2f meeting
captured. Additional comments added.
1.7d Feb. 3, 03 Audio17d.doc Geert Knapen Changes from 1.7c accepted. Additional
changes introduced.
1.7e Feb. 19, 03 Audio17e.doc Geert Knapen Introduced physical vs. logical channel
cluster
1.7f Feb. 19, 03 Audio17f.doc Geert Knapen Accepted all changes in 1.7e. Fixed some
typos.
1.7g Jun. 2, 03 Audio17g.doc Geert Knapen Major overhaul with the introduction of the
RANGE attribute.
1.7h Jun. 3, 03 Audio17h.doc Geert Knapen Accepted all changes
USB Device Class Definition for Audio Devices
Release 2.0 May 31, 2006 3
Revision Date Filename Author Description
1.7i Jul. 10, 03 Audio17i.doc Geert Knapen Introduced clock domain, interface
association descriptor
1.7j Jul. 10, 03 Audio17j.doc Geert Knapen Accepted all changes
1.7k Sep. 8, 03 Audio17k.doc Geert Knapen Introduced Function Subclass codes,
extended interrupt usage, cleaned up clock
domains and removed clock domain group
concept. Replaced by Clock Source Entity.
1.7l Sep. 10, 03 Audio17l.doc Geert Knapen Accepted all the changes
1.7m Sep. 15, 03 Audio17m.doc Geert Knapen Cleaned up Interrupt description
1.7n Sep. 30, 03 Audio17n.doc Geert Knapen Accepted all changes
1.7o Sep. 30, 03 Audio17o.doc Geert Knapen Major rewrite w.r.t. Controls.
1.7p Nov. 05, 03 Audio17p.doc Geert Knapen Accepted all the changes. Added bit pairs
for indicating Control availability
1.7q Nov. 07, 03 Audio17q.doc Geert Knapen Introduced the new concept of controlling
sampling frequency
1.7r Dec. 01, 03 Audio17r.doc Geert Knapen Accepted all the changes
1.7s Dec. 10, 03 Audio17s.doc Geert Knapen Changed physical-logical cluster mapping.
Added explanation on binding between
physical buttons and Audio Controls
1.7t Feb. 04, 04 Audio17t.doc Geert Knapen Accepted all changes
1.7u Feb. 05, 04 Audio17u.doc Geert Knapen Introduced Effect Unit. Regrouped some
PUs into the EU concept. Added
Parametric EQ as an EU. Accepted all
changes
1.7v Mar. 30, 04 Audio17v.doc Geert Knapen Full proof-read. Changed formatting and
wording throughout the document
1.7w Mar. 30, 04 Audio17w.doc Geert Knapen Accepted all the changes. Added new
Function Categories. Added physical
cluster desctriptor to AS interface
descriptor.
1.7x Apr. 13, 04 Audio17x.doc Geert Knapen Accepted all the changes. Added new
Function Categories. Added support for
encoders and decoders.
1.7y Apr. 28, 04 Audio17y.doc Geert Knapen Accepted all the changes.
1.7z May 15, 04 Audio17z.doc Geert Knapen Added some fields to encoder descriptors.
1.8 May 26, 04 Audio18.doc Geert Knapen Accepted all changes and promoted to 1.8
level
USB Device Class Definition for Audio Devices
Release 2.0 May 31, 2006 4
Revision Date Filename Author Description
1.8a Sep. 15, 04 Audio18a.doc Geert Knapen Corrected some errors in table offsets etc
as indicated by Len Layton (CMedia)
Identified the need to address ASR
converter Unit
1.8b Mar. 15, 05 Audio18b.doc Geert Knapen Minor editorial changes
1.8c Aug. 10, 05 Audio18c.doc Geert Knapen Minor editorial changes
1.8d Aug. 16, 05 Audio18d.doc Geert Knapen Accepted editorial changes, based on F2F
meeting review. Added and accepted an ID
field for all encoder and decoder
descriptors. This ID must also be passed
into the requests that address the encoder
or decoder.
1.8e Aug. 17, 05 Audio18e.doc Geert Knapen Redid the encoder sections. Added
generic latency support. Added SRC Unit.
1.8f Aug. 31, 05 Audio18f.doc Geert Knapen Fixed some heading levels. Added DTS.
1.8g Sep. 02, 05 Audio18g.doc Geert Knapen Added Encoder and Decoder Error Codes.
Accepted all the changes.
1.9RC1 Sep. 02, 05 Audio19RC1.doc Geert Knapen Republished unchanged as 1.9RC1.
1.9RC2 Oct. 05, 05 Audio19RC2.doc Geert Knapen Made several small editorial changes.
Accepted all the changes.
1.9 Oct. 07, 05 Audio19.doc Geert Knapen Promoted to 1.9 without change.
2.0RC1 May 19, 06 Audio20RC1.doc Geert Knapen Addressed and accepted some minor
changes. Declared this document as the
Release Candidate for the 2.0 version.
2.0 May 31, 06 Audio20.doc Geert Knapen Added new Intellectual Property
Disclaimer. Final version.
USB Device Class Definition for Audio Devices
Release 2.0 May 31, 2006 5
Copyright © 1997-2006 USB Implementers Forum, Inc.
All rights reserved.
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USE ONLY. NO OTHER LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE,
IS GRANTED OR INTENDED HEREBY.
USB-IF AND THE AUTHORS OF THIS SPECIFICATION EXPRESSLY DISCLAIM ALL
LIABILITY FOR INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS RELATING TO
IMPLEMENTATION OF INFORMATION IN THIS SPECIFICATION. USB-IF AND THE
AUTHORS OF THIS SPECIFICATION ALSO DO NOT WARRANT OR REPRESENT THAT
SUCH IMPLEMENTATION(S) WILL NOT INFRINGE THE INTELLECTUAL PROPERTY RIGHTS
OF OTHERS.
THIS SPECIFICATION IS PROVIDED “AS IS” AND WITH NO WARRANTIES, EXPRESS OR
IMPLIED, STATUTORY OR OTHERWISE. ALL WARRANTIES ARE EXPRESSLY
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PROVIDE
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