USB音频设备的设计与实现

Design and Implementation of USB Audio Device

在介绍USB音频设备及其驱动程序结构的基础上,对USB Audio功能节点、USB Audio描述符、USB Audio请求、码流同步等设计重要方面进行了详细论述,提出了一种准同步USB码流速度匹配方法。使用准同步法,在一对USB ISO端点上,成功地实现了实时全双工USB音频通信功能,简化了时钟同步系统的设计。

Introduce the structure of USB audio device and the structure of USB audio driver, discuss the function endpoints of USB audio peripheral, the USB audio descriptors, the USB audio request and the synch mechanism for USB audio stream detailly, bring out a new synch method called plesiochronous communication for USB audio stream speed matching. Using the plesiochronous communication model , implement duplex audio communication functions on twain USB ISO endpoints, simplify the design of clock synch system .