中文摘要：

在分析Purepath无线音频协议的基础上，设计了基于CC8531的高保真、低功耗的USB无线声卡。结合系统需求拟定了以CC8531无线音频流芯片为核心、TLV320AIC3254为音频解码器、辅以按键控制和LDO电源降压电路等外围模块的硬件结构，并分析了各个模块的电路设计。在此基础上，通过使用Purepath无线配置平台对CC8531芯片进行参数配置和固件烧写，实现了完整的系统。经过测试，USB无线声卡能稳定传输CD级高保真音质，距离最高达到130m，并实现了条件配对组网、自动功耗调节、远程音量控制等功能，可用于板载声卡的替代，也可用作无线耳机、无线音响，具有一定的市场价值。

英文摘要：

Based on the analysis of Purepath wireless audio protocol, a CD-class low-power USB wireless soundcard is designed. Combi- ning the system requirements, a system structure is developed based on RF streaming chip CC8531, the codec TLV320AIC3254 and other peripheral function modules. Then a detailed description of the circuit design is given. After that,CC8531 chip is programmed through the Purepath wireless platform and a complete system is finally finished. As test shows the USB wireless soundcard can achieve a high-fidelity wireless transmission with distance up to 130 m. In addition, the system increases pairing networking, automatic power adjustment, volume control and other functions. It can not only used as an alternative to onboard soundcard but also as a wireless headset or a wireless audio speaker.