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Audio class

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SEGGER emUSB-Host

Overview

The USB class protocol for AUDIO was defined for devices or functions embedded in composite devices that are used to manipulate audio, voice, and sound-related functionality. This includes both audio data and the functionality that is used to directly control the audio environment, such as Volume and Tone Control.

Microphone
The emUSB-Host AUDIO class enables the communication with any device that complies with the USB Device Class Definition for Audio Devices as specified by the USB Implementers Forum.

Key features

  • Compatibility with USB Audio V1.0 devices.
  • Transfer sound to audio output devices (e.g. speakers).
  • Receive data from audio input devices (e.g. microphones).
  • Control the audio environment, such as Volume and Tone Control.
  • Notifications about insertion and removal of audio devices.
  • All common sample rates supported (8, 16, 22.05, 44.1, 48, 96, 192 kHz, etc.)
  • All sample resolutions supported (8, 16, 24, 32 bit per sample)
  • Any number of channels supported
  • Small footprint

Application Examples for emUSB-Host AUDIO

Microphone

Microphone

USB Speaking

Speakers

Bluetooth Speaker

Sound bar

emUSB device audio headset headphones

Headset

USB Soundcard

USB sound card

Sample Applications Available

emusb audio

SEGGER provides multiple examples with the Audio class for emUSB-Host. One of the examples plays a voice to a connected USB speaker. If additionally an USB memory stick with a ".wav" file is connected, the audio file is played.

Another example reads audio data from an input device (like a microphone) and outputs the volume level.

Requirements

Components required to use emUSB-Host AUDIO:

  • emUSB-Host AUDIO
  • emUSB-Host core
  • emUSB-Host target driver
  • Real-time operating system (embOS or other)

Resource usage