Consumer USB Audio

USB Audio Streaming Device

Client: Audio Products Company

USB Audio Streaming Device

Overview

USB audio is notoriously difficult to get right. We developed a fully UAC 2.0 compliant audio streaming device, building the complete signal path from USB host interface through sample rate conversion to codec output, with reliable operation across Windows, macOS, and Linux.

Project Details

Client
Audio Products Company
Industry
Consumer Electronics
Year
2021

The Challenge

USB Audio Class 2.0 is one of the more complex USB specifications to implement correctly. Isochronous transfers demand precise timing, clock domains must be synchronized to avoid audible artifacts, and subtle descriptor errors cause silent failures on specific operating systems. The device needed low-latency performance without dropouts across the full range of host configurations.

The Solution

We implemented the complete UAC 2.0 stack from scratch, including isochronous endpoint handling, adaptive clock synchronization, and the full suite of audio control interfaces. The audio pipeline handles sample rate conversion and codec interfacing with latency low enough for real-time monitoring. Extensive cross-platform testing ensured reliable operation on Windows, macOS, and Linux hosts.

Technology Stack

USB Audio Class 2.0 Isochronous Transfers Audio Codec Sample Rate Conversion ARM Cortex-M

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