EN IEC 62680-1-8:2019
(Main)Universal serial bus interfaces for data and power - Part 1-8: Common components - USB Audio 3.0 device class definition terminal types
Universal serial bus interfaces for data and power - Part 1-8: Common components - USB Audio 3.0 device class definition terminal types
IEC 62680-1-8:2019 is to describe in detail all the Terminal Types that are supported by the Audio Device Class. This document is considered an integral part of the Audio Device Class Specification, although subsequent revisions of this document are independent of the revision evolution of the main Audio Device Class Specification. This is to easily accommodate the addition of new Terminal Types without impeding the core Audio Device Class Specification. The Audio Device Class Definition applies to all devices or functions embedded in composite devices. All audio signals inside an audio function start at an Input Terminal, pass through some Units, and leave the function through an Output Terminal. Units can manipulate the signal in various ways. Terminals represent the connections of the function to the outside world. As part of the Terminal descriptor, the wTerminalType field specifies the vendor’s suggested use of the Terminal. For example, a pair of speakers is a more suitable target for music output than a telephone line. This feature allows a vendor to ensure that applications use the device in a consistent and meaningful way.
Schnittstellen des Universellen Seriellen Busses für Daten und Energie - Teil 1-8: Gemeinsame Komponenten - USB Audio 3.0 Geräteklassendefinition Anschlussarten
Interfaces de bus universel en série pour les données et l'alimentation électrique - Partie 1-8: Composants communs - Définition de classes de dispositifs USB Audio 3.0 pour types de terminaux
L'IEC 62680-1-8:2019 a pour objectif de décrire en détail tous les types de terminaux pris en charge par la classe des dispositifs audio. Le présent document est vu comme faisant partie intégrante de la Spécification de classe de dispositifs audio, bien que les révisions ultérieures du présent document soient indépendantes de l'évolution des révisions de la Spécification de classe de dispositifs audio principale. L'objectif est de faciliter la prise en compte de l'ajout de nouveaux types de terminaux sans affecter la Spécification de classe de dispositifs audio de base. La définition de classes de dispositifs audio s'applique à tous les dispositifs ou fonctions intégrés dans des dispositifs composites. Tous les signaux audio au sein d'une fonction audio partent d'un terminal d'entrée, passent par des unités, puis quittent la fonction par un terminal de sortie. Les unités peuvent manipuler le signal de différentes façons. Les terminaux représentent les connexions de la fonction au monde extérieur. Le champ wTerminalType, qui fait partie du descripteur de terminal, indique l'utilisation suggérée par le fournisseur du terminal. Par exemple, une paire de haut-parleurs est une cible plus appropriée pour une sortie musicale qu'une ligne téléphonique. Cette fonctionnalité permet à un fournisseur de s'assurer que les applications utilisent le dispositif de manière cohérente et pertinente.
Vmesniki univerzalnega serijskega vodila za prenos podatkov in napajanje - 1-8. del: Skupne komponente - Definicija tipa naprave USB Avdio 3.0 za vrste terminalov (IEC 62680-1-8:2019)
General Information
- Status
- Published
- Publication Date
- 14-Nov-2019
- Withdrawal Date
- 23-Oct-2022
- Technical Committee
- CLC/TC 100X - Audio, video and multimedia systems and equipment and related sub-systems
- Drafting Committee
- IEC/TC 100 - IEC_TC_100
- Current Stage
- 6060 - Document made available - Publishing
- Start Date
- 15-Nov-2019
- Completion Date
- 15-Nov-2019
Overview
EN IEC 62680-1-8:2019 (IEC 62680-1-8:2019) defines the USB Audio 3.0 device class terminal types. Adopted from the USB-IF "USB Device Class Definition for Terminal Types Release 3.0", this standard describes the terminal descriptors and the vendor-suggested terminal uses (the wTerminalType field) that are part of the USB Audio Device Class. It is an integral, but independently-updatable, component of the broader Audio Device Class Specification and applies to audio functions embedded in composite USB devices.
Key Topics
- Terminal model and signal flow: Audio signals start at an Input Terminal, pass through one or more Units (signal-processing elements), and exit via an Output Terminal.
- Terminal descriptor semantics: The wTerminalType field indicates a vendor’s suggested use (for example, speakers vs telephone output) so hosts and applications can choose appropriate audio routing and defaults.
- Terminal categories: The document organizes terminal types into sets such as USB terminal types, Input, Output, Bi-directional, Telephony, External, and Embedded function terminal types.
- Extensibility: The specification supports adding new terminal types independently of the core Audio Device Class Specification, enabling future expansion without impeding the main standard.
- Release & provenance: This EN IEC version (2019) is based on the USB-IF Release 3.0 publication and preserves USB-IF terminology and structure.
Applications
- Hardware manufacturers: USB audio peripheral designers (headsets, speaker systems, USB sound cards, telephony devices) use terminal type definitions to label ports and behavior for correct host integration.
- Firmware & driver developers: Device firmware and OS drivers map descriptors to device functions and ensure correct audio routing, control exposure, and class-compliant behavior.
- System integrators & OEMs: Integrate composite devices that include multiple audio functions and ensure consistent application behavior.
- Test labs & certification: Use terminal definitions during interoperability and conformance testing to validate expected host-device interactions.
- Application developers: Multimedia and telephony apps use terminal type hints to select appropriate audio endpoints (e.g., prioritize “telephone” vs “music” outputs).
Related Standards
- IEC 62680 series (Universal serial bus interfaces for data and power) - Part 1 covers common components.
- Audio Device Class Specification (USB Audio) - this terminal-types document is treated as part of the Audio Device Class family though it can be revised independently.
- USB Implementers Forum (USB-IF) device class publications - original source for Release 3.0 content.
Keywords: USB Audio 3.0, terminal types, wTerminalType, USB device class, audio device class, EN IEC 62680-1-8:2019, USB-IF, composite devices, audio routing.
Frequently Asked Questions
EN IEC 62680-1-8:2019 is a standard published by CLC. Its full title is "Universal serial bus interfaces for data and power - Part 1-8: Common components - USB Audio 3.0 device class definition terminal types". This standard covers: IEC 62680-1-8:2019 is to describe in detail all the Terminal Types that are supported by the Audio Device Class. This document is considered an integral part of the Audio Device Class Specification, although subsequent revisions of this document are independent of the revision evolution of the main Audio Device Class Specification. This is to easily accommodate the addition of new Terminal Types without impeding the core Audio Device Class Specification. The Audio Device Class Definition applies to all devices or functions embedded in composite devices. All audio signals inside an audio function start at an Input Terminal, pass through some Units, and leave the function through an Output Terminal. Units can manipulate the signal in various ways. Terminals represent the connections of the function to the outside world. As part of the Terminal descriptor, the wTerminalType field specifies the vendor’s suggested use of the Terminal. For example, a pair of speakers is a more suitable target for music output than a telephone line. This feature allows a vendor to ensure that applications use the device in a consistent and meaningful way.
IEC 62680-1-8:2019 is to describe in detail all the Terminal Types that are supported by the Audio Device Class. This document is considered an integral part of the Audio Device Class Specification, although subsequent revisions of this document are independent of the revision evolution of the main Audio Device Class Specification. This is to easily accommodate the addition of new Terminal Types without impeding the core Audio Device Class Specification. The Audio Device Class Definition applies to all devices or functions embedded in composite devices. All audio signals inside an audio function start at an Input Terminal, pass through some Units, and leave the function through an Output Terminal. Units can manipulate the signal in various ways. Terminals represent the connections of the function to the outside world. As part of the Terminal descriptor, the wTerminalType field specifies the vendor’s suggested use of the Terminal. For example, a pair of speakers is a more suitable target for music output than a telephone line. This feature allows a vendor to ensure that applications use the device in a consistent and meaningful way.
EN IEC 62680-1-8:2019 is classified under the following ICS (International Classification for Standards) categories: 33.120.20 - Wires and symmetrical cables; 33.120.30 - RF connectors; 35.200 - Interface and interconnection equipment. The ICS classification helps identify the subject area and facilitates finding related standards.
You can purchase EN IEC 62680-1-8:2019 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CLC standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2020
Vmesniki univerzalnega serijskega vodila za prenos podatkov in napajanje - 1-8.
del: Skupne komponente - Definicija tipa naprave USB Avdio 3.0 za vrste
terminalov (IEC 62680-1-8:2019)
Universal serial bus interfaces for data and power - Part 1-8: Common components -
USB Audio 3.0 Device Class Definition Terminal Types (IEC 62680-1-8:2019)
Schnittstellen des Universellen Seriellen Busses für Daten und Energie - Teil 1-8:
Gemeinsame Komponenten - USB Audio 3.0 Geräteklassendefinition Anschlussarten
(IEC 62680-1-8:2019)
Interfaces de bus universel en série pour les données et l'alimentation électrique - Partie
1-8: Composants communs - Définition de classes de dispositifs USB Audio 3.0 pour
types de terminaux (IEC 62680-1-8:2019)
Ta slovenski standard je istoveten z: EN IEC 62680-1-8:2019
ICS:
35.200 Vmesniška in povezovalna Interface and interconnection
oprema equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 62680-1-8
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2019
ICS 33.120.20; 33.120.30; 35.200
English Version
Universal serial bus interfaces for data and power - Part 1-8:
Common components - USB Audio 3.0 device class definition
terminal types
(IEC 62680-1-8:2019)
Interfaces de bus universel en série pour les données et Schnittstellen des Universellen Seriellen Busses für Daten
l'alimentation électrique - Partie 1-8: Composants communs und Energie - Teil 1-8: Gemeinsame Komponenten - USB
- Définition de classes de dispositifs USB Audio 3.0 pour Audio 3.0 Geräteklassendefinition Anschlussarten
types de terminaux (IEC 62680-1-8:2019)
(IEC 62680-1-8:2019)
This European Standard was approved by CENELEC on 2019-10-24. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62680-1-8:2019 E
European foreword
The text of document 100/3160/CDV, future edition 1 of IEC 62680-1-8, prepared by IEC/TC 100
"Audio, video and multimedia systems and equipment" was submitted to the IEC-CENELEC parallel
vote and approved by CENELEC as EN IEC 62680-1-8:2019.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-07-24
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-10-24
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 62680-1-8:2019 was approved by CENELEC as a
European Standard without any modification.
IEC 62680-1-8 ®
Edition 1.0 2019-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Universal serial bus interfaces for data and power –
Part 1-8: Common components – USB Audio 3.0 device class definition terminal
types
Interfaces de bus universel en série pour les données et l'alimentation
électrique –
Partie 1-8: Composants communs – Définition de classes de dispositifs USB
Audio 3.0 pour types de terminaux
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.120.20; 33.120.30; 35.200 ISBN 978-2-8322-7245-9
– 2 – IEC 62680-1-8:2019
© USB-IF:1997-2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
UNIVERSAL SERIAL BUS INTERFACES FOR DATA AND POWER –
Part 1-8: Common components –
USB Audio 3.0 device class definition terminal types
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62680-1-8 has been prepared by technical area 18: Multimedia
home systems and applications for end-user networks, of IEC technical committee 100: Audio,
video and multimedia systems and equipment.
The text of this standard was prepared by the USB Implementers Forum (USB-IF). The
structure and editorial rules used in this publication reflect the practice of the organization
which submitted it.
Copyright © 1997-2016 USB Implementers Forum, Inc. All rights reserved.
–IE 3C – 6 2680-1-8:2019 – 3 –
© USB-IF:1997-2016
The text of this International Standard is based on the following documents:
CDV Report on voting
100/3160/CDV 100/3230/RVC
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
Copyright © 1997-2016 USB Implementers Forum, Inc. All rights reserved.
– 4 – IEC 62680-1-8:2019
© USB-IF:1997-2016
INTRODUCTION
The IEC 62680 series is based on a series of specifications that were originally developed by the USB
Implementers Forum (USB-IF). These specifications were submitted to the IEC under the auspices of
a special agreement between the IEC and the USB-IF.
This standard is the USB-IF publication USB Device Class Definition for Terminal Types Release 3.0.
The USB Implementers Forum, Inc.(USB-IF) is a non-profit corporation founded by the group of
companies that developed the Universal Serial Bus specification. The USB-IF was formed to provide a
support organization and forum for the advancement and adoption of Universal Serial Bus technology.
The Forum facilitates the development of high-quality compatible USB peripherals (devices), and
promotes the benefits of USB and the quality of products that have passed compliance testing.
ANY USB SPECIFICATIONS ARE PROVIDED TO YOU "AS IS, "WITH NO WARRANTIES
WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY, NON-INFRINGEMENT,
OR FITNESS FOR ANY PARTICULAR PURPOSE. THE USB IMPLEMENTERS FORUM AND THE
AUTHORS OF ANY USB SPECIFICATIONS DISCLAIM ALL LIABILITY, INCLUDING LIABILITY
FOR INFRINGEMENT OF ANY PROPRIETARY RIGHTS, RELATING TO USE OR
IMPLEMENTATION OR INFORMATION IN THIS SPECIFICAITON.
THE PROVISION OF ANY USB SPECIFICATIONS TO YOU DOES NOT PROVIDE YOU WITH ANY
LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL
PROPERTY RIGHTS.
Entering into USB Adopters Agreements may, however, allow a signing company to participate in a
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https://www.usb.org/documents
IEC DOES NOT TAKE ANY POSITION AS TO WHETHER IT IS ADVISABLE FOR YOU TO ENTER
INTO ANY USB ADOPTERS AGREEMENTS OR TO PARTICIPATE IN THE USB IMPLEMENTERS
FORUM.”
Copyright © 1997-2016 USB Implementers Forum, Inc. All rights reserved.
–IE 5C – 6 2680-1-8:2019 – 5 –
© USB-IF:1997-2016
UNIVERSAL SERIAL BUS
DEVICE CLASS DEFINITION
FOR
TERMINAL TYPES
Release 3.0
September 22, 2016
Copyright © 1997-2016 USB Implementers Forum, Inc. All rights reserved.
– 6 – IEC 62680-1-8:2019
© USB-IF:1997-2016
SCOPE OF THIS RELEASE
This document is the Release 3.0 of this device class definition.
CONTRIBUTORS
Joe Scanlon Advanced Micro Devices
Rhoads Hollowell Apple Inc.
Girault Jones Apple Inc.
Matthew X. Mora Apple Inc.
Tzung-Dar Tsai C-Media Electronics, Inc.
Brad Lambert Cirrus Logic, Inc.
Dan Bogard Conexant Systems, Inc.
Pete Burgers DisplayLink (UK), Ltd.
David Roh Dolby Laboratories, Inc.
Leng Ooi Google, Inc.
Pierre-Louis Bossart Intel Corporation
David Hines Intel Corporation
Abdul Rahman Ismail (Co-Chair) Intel Corporation
Devon Worrell Intel Corporation
Chandrashekhar Rao Logitech, Inc.
Terry Moore MCCI Corporation
Alex Lin MediaTek, Inc.
Bala Sivakumar Microsoft Corporation
Geert Knapen (Co-Chair & Editor) NXP Semiconductors
PL Mobile Audio
411 E. Plumeria drive
San Jose, CA 95134, USA
E-mail: geert.knapen@nxp.com
James Goel Qualcomm, Inc.
Andre Schevciw Qualcomm, Inc.
Jin-Sheng Wang Qualcomm, Inc.
Morten Christiansen Synopsys
REVISION HISTORY
Revision Date Filename Description
1.0 Mar. 18, 98 Termt10.pdf Release 1.0
2.0 May. 31, 06 Termt20 final.pdf Release 2.0
3.0 Sep. 22, 16 Termt30.pdf Release 3.0
Copyright © 1997-2016 USB Implementers Forum, Inc. All rights reserved.
–IE 7C – 6 2680-1-8:2019 – 7 –
© USB-IF:1997-2016
Copyright © 1997-2016 USB Implementers Forum, Inc.
All rights reserved.
INTELLECTUAL PROPERTY DISCLAIMER
A LICENSE IS HEREBY GRANTED TO REPRODUCE THIS SPECIFICATION FOR INTERNAL 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 DISCLAIMED. USB-IF, ITS MEMBERS AND THE AUTHORS OF THIS
SPECIFICATION PROVIDE NO WARRANTY OF MERCHANTABILITY, NO WARRANTY OF NON-INFRINGEMENT, NO
WARRANTY OF FITNESS FOR ANY PARTICULAR PURPOSE, AND NO WARRANTY ARISING OUT OF ANY PROPOSAL,
SPECIFICATION, OR SAMPLE.
IN NO EVENT WILL USB-IF, MEMBERS OR THE AUTHORS BE LIABLE TO ANOTHER FOR THE COST OF PROCURING
SUBSTITUTE GOODS OR SERVICES, LOST PROFITS, LOSS OF USE, LOSS OF DATA OR ANY INCIDENTAL,
CONSEQUENTIAL, INDIRECT, OR SPECIAL DAMAGES, WHETHER UNDER CONTRACT, TORT, WARRANTY, OR
OTHERWISE, ARISING IN ANY WAY OUT OF THE USE OF THIS SPECIFICATION, WHETHER OR NOT SUCH PARTY
HAD ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
NOTE: VARIOUS USB-IF MEMBERS PARTICIPATED IN THE DRAFTING OF THIS SPECIFICATION. CERTAIN OF
THESE MEMBERS MAY HAVE DECLINED TO ENTER INTO A SPECIFIC AGREEMENT LICENSING INTELLECTUAL
PROPERTY RIGHTS THAT MAY BE INFRINGED IN THE IMPLEMENTATION OF THIS SPECIFICATION. PERSONS
IMPLEMENT THIS SPECIFICATION AT THEIR OWN RISK.
Dolby™, AC-3™, Pro Logic™ and Dolby Surround™ are trademarks of Dolby Laboratories, Inc.
All other product names are trademarks, registered trademarks, or service marks of their respective owners.
Please send comments via electronic mail to audio-chair@usb.org
Copyright © 1997-2016 USB Implementers Forum, Inc. All rights reserved.
– 8 – IEC 62680-1-8:2019
© USB-IF:1997-2016
TABLE OF CONTENTS
Scope of This Release .
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기사 제목: EN IEC 62680-1-8:2019 - 데이터 및 전원을 위한 범용 시리얼 버스 인터페이스 - 파트 1-8: 공통 구성 요소 - USB 오디오 3.0 장치 클래스 정의 터미널 유형 기사 내용: IEC 62680-1-8:2019은 오디오 장치 클래스에서 지원하는 모든 터미널 유형에 대해 자세하게 설명한 것입니다. 이 문서는 오디오 장치 클래스 사양의 일부로 간주되지만, 이 문서의 후속 개정은 본 오디오 장치 클래스 사양의 개정 발전과 독립적입니다. 이는 핵심 오디오 장치 클래스 사양에 영향을 미치지 않고 새로운 터미널 유형을 쉽게 추가할 수 있도록 하기 위함입니다. 오디오 장치 클래스 정의는 복합 장치에 내장된 모든 장치나 기능에 적용됩니다. 오디오 기능 내의 모든 오디오 신호는 입력 터미널에서 시작하여 몇 개의 유닛을 지나 출력 터미널을 통해 장치를 떠나게 됩니다. 유닛은 신호를 다양한 방식으로 조작할 수 있습니다. 터미널은 장치의 외부 세계와의 연결을 나타냅니다. 터미널 서술자의 일부로 wTerminalType 필드는 제조업체가 터미널의 권장 사용 방법을 지정합니다. 예를 들어, 스피커 한 쌍은 전화 회선보다 음악 출력에 더 적합한 대상입니다. 이 기능을 통해 제조업체는 응용 프로그램이 일관되고 의미 있는 방식으로 장치를 사용하도록 보장할 수 있습니다.
記事のタイトル：EN IEC 62680-1-8:2019 - データと電力のための汎用シリアルバスインターフェース - Part 1-8: 共通コンポーネント - USBオーディオ3.0デバイスクラス定義端子タイプ 記事の内容：IEC 62680-1-8:2019は、オーディオデバイスクラスでサポートされるすべての端子タイプについて詳細に説明しています。この文書は、オーディオデバイスクラスの仕様の一部であり、後続の改訂はメインのオーディオデバイスクラス仕様の改訂の進化とは独立しています。これにより、コアのオーディオデバイスクラス仕様に影響を与えることなく新しい端子タイプを容易に追加することができます。オーディオデバイスクラスの定義は、コンポジットデバイスに埋め込まれたすべてのデバイスまたは機能に適用されます。オーディオ信号は入力端子から始まり、いくつかのユニットを経て出力端子を通じてデバイスを離れます。ユニットは信号をさまざまな方法で操作できます。端子は、デバイスと外部の世界の接続を表します。端子ディスクリプタの一部として、wTerminalTypeフィールドはベンダーが端子の推奨使用方法を指定します。たとえば、スピーカーペアは電話回線よりも音楽の出力に適しています。この機能により、ベンダーはアプリケーションがデバイスを一貫して有意義に使用することを保証できます。
The article discusses the EN IEC 62680-1-8:2019 standard, which provides a detailed description of the Terminal Types supported by the Audio Device Class. This document is considered an integral part of the Audio Device Class Specification and allows for easy addition of new Terminal Types without affecting the core specification. The Audio Device Class Definition applies to all devices or functions embedded in composite devices, and audio signals follow a path from an Input Terminal through Units and exit the function through an Output Terminal. The Terminal descriptor includes the wTerminalType field, which specifies the suggested use of the Terminal by the vendor. This feature ensures that applications use the device consistently and appropriately.
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