IEC 62680-1-8:2019

Overview

IEC 62680-1-8:2019 is an international standard developed by the International Electrotechnical Commission (IEC) in collaboration with the USB Implementers Forum (USB-IF). This standard provides a comprehensive definition of terminal types for USB Audio 3.0 device classes, specifying the common components used in universal serial bus interfaces for data and power. It specifically addresses all terminal types supported by the USB Audio Device Class, enabling consistent and meaningful interaction between audio devices and host applications.

The standard forms an essential part of the Audio Device Class Specification but is maintained independently to allow the seamless addition of new terminal types without disrupting the core audio class specifications. It categorizes audio terminals as input, output, bi-directional, telephony, external, and embedded function types, describing their capabilities and intended vendor-specific usages.

Key Topics

• Terminal Type Definitions: IEC 62680-1-8:2019 details the classification of terminal types in USB Audio 3.0 devices, including:

  • Input terminals: Where audio signals enter the device.
  • Output terminals: Where audio signals exit the device.
  • Bi-directional terminals: Supporting both input and output signals.
  • Telephony terminals: Specialized types for telephony applications.
  • External terminals: Interfaces connecting to external audio components.
  • Embedded function terminals: Internal processing units within the device.

• wTerminalType Field: Each terminal descriptor contains the wTerminalType attribute indicating the vendor’s recommended usage scenario, supporting tailored application behavior and ensuring consistent device functionality across different software environments.

• Flexibility for Updates: The standard’s structure allows for future extensions by enabling new terminal types to be added independently, facilitating evolving audio technologies and use cases without impacting existing device implementations.

• Scope and Integration: Applies to all audio functions within a composite USB device, covering signal flow through terminals and intermediary processing units to enable comprehensive audio interface descriptions.

Applications

• USB Audio Device Development: Provides manufacturers with clear guidelines for implementing USB Audio 3.0 device interfaces, ensuring compatibility and interoperability across a wide range of audio peripherals such as microphones, speakers, headsets, and telephony devices.

• Operating System and Driver Design: Enables OS developers to recognize and handle diverse audio terminal types systematically, improving device support and user experience.

• Consumer Electronics: Facilitates integration of USB audio interfaces in consumer devices like laptops, gaming consoles, and smart home audio systems by standardizing terminal specifications.

• Professional Audio Equipment: Assists manufacturers of professional audio gear in delivering USB-compliant audio interfaces that support complex signal routing and device functions.

• Telecommunication Devices: Supports telephony-related terminal types, tailored for USB-based communication devices, ensuring effective audio signal handling.

Related Standards

• IEC 62680 Series: A wider framework covering universal serial bus interfaces for data and power, including various device class specifications beyond audio.

• USB Device Class Specifications: Including USB Audio Device Class core specifications, which define the overall audio class requirements to which this terminal types document is a complement.

• USB Implementers Forum Publications: The USB-IF develops associated technical reports and compliance testing guidelines to support implementation of USB specifications referenced by this standard.

• International Electrotechnical Vocabulary (IEV): Provides terminology harmonization supporting IEC standards’ clarity and consistency in electrotechnical and multimedia domains.

Keywords: IEC 62680-1-8, USB Audio 3.0, terminal types, audio device class, USB interface standards, USB audio terminals, USB-IF, universal serial bus audio, composite USB devices, audio device specifications, wTerminalType, audio interoperability, telephony terminals, USB device implementation, IEC standards audio