These Terminal Types describe Terminals that handle signals carried over the USB, usually through isochronous pipes. These Terminal Types are valid for both Input and Output Terminals.
Terminal Type
Code
I/O
Description
USB Undefined
0x0100
I/O
USB Terminal, undefined Type.
USB streaming
0x0101
I/O
A Terminal dealing with a signal carried over an endpoint in an AudioStreaming interface. The AudioStreaming interface descriptor points to the associated Terminal through the bTerminalLink field.
USB vendor specific
0x01FF
I/O
A Terminal dealing with a signal carried over a vendor-specific interface. The vendor-specific interface descriptor must contain a field that references the Terminal.
Input Terminal Types
These Terminal Types describe Terminals that are designed to record sounds. They either are physically part of the audio function or can be assumed to be connected to it in normal operation. These Terminal Types are valid only for Input Terminals
Terminal Type
Code
I/O
Description
Input Undefined
0x0200
I
Input Terminal, undefined Type.
Microphone
0x0201
I
A generic microphone that does not fit under any of the other classifications.
Desktop microphone
0x0202
I
A microphone normally placed on the desktop or integrated into the monitor.
Personal microphone
0x0203
I
A head-mounted or clip-on microphone.
Omni-directional microphone
0x0204
I
A microphone designed to pick up voice from more than one speaker at relatively long ranges.
Microphone array
0x0205
I
An array of microphones designed for directional processing using host-based signal processing algorithms.
Processing microphone array
0x0206
I
An array of microphones with an embedded signal processor.
Output Terminal Types
These Terminal Types describe Terminals that produce audible signals that are intended to be heard by the user of the audio function. They either are physically part of the audio function or can be assumed to be connected to it in normal operation. These Terminal Types are only valid for Output Terminals. The distinction between headphones, desktop speakers, and room speakers may be used by applications to select different 3D signal processing algorithms
Terminal Type
Code
I/O
Description
Output Undefined
0x0300
O
Output Terminal, undefined Type.
Speaker
0x0301
O
A generic speaker or set of speakers that does not fit under any of the other classifications.
Headphones
0x0302
O
A head-mounted audio output device.
Head Mounted Display Audio
0x0303
O
The audio part of a VR head mounted display. The Associated Interfaces descriptor can be used to reference the HID interface used to report the position and orientation of the HMD.
Desktop speaker
0x0304
O
Relatively small speaker or set of speakers normally placed on the desktopor integrated into the monitor. These speakers are close to the user and have limited stereo separation.
Room speaker
0x0305
O
Larger speaker or set of speakers that are heard well anywhere in the room.
Communication speaker
0x0306
O
Speaker or set of speakers designed for voice communication.
Low frequency effects speaker
0x0307
O
Speaker designed for low frequencies (subwoofer). Not capable of reproducing speech or music.
Bi-directional Terminal Types
These Terminal Types describe an Input and an Output Terminal for voice communication that are closely related. They should be used together for bi-directional voice communication. They may be used separately for input only or output only. These types require two Terminal descriptors. Both have the same type. The two Terminals are linked together through the bAssocTerminal fields in their respective Terminal descriptors. The Associated Interfaces descriptor can be used to reference a HID interface for conferencing functions.
Terminal Type
Code
I/O
Description
Bi-directional Undefined
0x0400
I/O
Bi-directional Terminal, undefined Type.
Handset
0x0401
I/O
Hand-held bi-directional audio device.
Headset
0x0402
I/O
Head-mounted bi-directional audio device.
Speakerphone, no echo reduction
0x0403
I/O
A hands-free audio device designed for host-based echo cancellation.
Echo-suppressing speakerphone 0
x0404
I/O
A hands-free audio device with echo suppression capable of half-duplex operation.
Echo-canceling speakerphone
0x0405
I/O
A hands-free audio device with echo cancellation capable of full-duplex operation.
Telephony Terminal Types
These Terminal Types describe Terminals that connect to the PSTN or PBX. Initiating calls and monitoring call progress will be done through an associated interface which may be Communication, HID or Vendor-Specific class. These Terminals are bi-directional and follow the rules for bi-directional Terminals.
Terminal Type
Code
I/O
Description
Telephony Undefined
0x0500
I/O
Telephony Terminal, undefined Type.
Phone line -
0x0501
I/O
May be an analog telephone line jack, an ISDN line, a proprietary PBX interface, or a wireless link.
Telephone -
0x0502
I/O
Device can be used as a telephone. When not in use as a telephone, handset is used as a bi-directional audio device.
Down Line Phone
0x0503
I/O
A standard telephone set connected to the device. When not in use as atelephone, it can be used as a bidirectional audio device.
External Terminal Types
These Terminal Types describe external resources and connections that do not fit under the categories of Input or Output Terminals because they do not necessarily translate acoustic signals to or from the user of the computer. Most of them may be either Input or Output Terminals.
Terminal Type
Code
I/O
Description
External Undefined
0x0600
I/O
External Terminal, undefined Type.
Analog connector
0x0601
I/O
A generic analog connector.
Digital audio interface
0x0602
I/O
A generic digital audio interface.
Line connector
0x0603
I/O
An analog connector at standard line levels. Usually uses 3.5mm.
Legacy audio connector
0x0604
I/O
An input connector assumed to be connected to the lineout of the legacy audio system of the host computer. Used for backward compatibility.
S/PDIF interface
0x0605
I/O
An S/PDIF digital audio interface. The Associated Interface descriptor can be used to reference an interface used for controlling special functions of this interface.
1394 DA stream
0x0606
I/O
An interface to audio streams on a 1394 bus.
1394 DV stream soundtrack
0x0607
I/O
An interface to soundtrack of A/V stream on a 1394 bus.
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UAC规范（USB音频）
