基于USB总线的听力障碍筛查设备设计

Design of Audio Acuity Equipment Based on the USB Bus

在一个基于计算机的听力障碍评价系统中,为了有效驱动听力计专用耳机并提高测量的准确度,设计了基于USB总线的听力障碍筛查设备。硬件方面,来自上位机的音频数据通过USB芯片和FPGA中设计的接口逻辑送入音频DAC中,并经过三级变换电路将其转换为模拟音频功率信号。软件方面,设计了驱动程序和DSP程序,实现了音频数据的发送和接受。该设备已成功应用在听力障碍评价系统中。

In a computer-based hearing loss evaluation system, in order to effectively drive audiometer headset and increase measurement accuracy, the audio acuity equipment based on the USB bus is designed. On the side of hardware, the audio data coming from a computer is sent to the audio DAC, having passed through an USB chip and interface logic in a FPGA. Meanwhile, the three-order converting circuit converts a signal to be a audio power signal. On the side of software, a DSP program and a driver of the computer are designed in order to accomplish sending and receiving the audio data. The equipment has been used in a hearing loss evaluation system successfully.