可用于电声测试系统的专业音频接口设计  

Design of professional audio interface available for electroacoustic testing system

作　　者：周静雷[1] 李腾飞 冯源 Zhou Jinglei;Li Tengfei;Feng Yuan(School of Electronic Information,Xi′an Polytechnic University,Xi′an 710048,China)

机构地区：[1]西安工程大学电子信息学院,陕西西安710048

出　　处：《电子技术应用》2019年第1期105-108,共4页Application of Electronic Technique

基　　金：陕西省教育厅专项科研项目(11JK0548)

摘　　要：针对电声测试系统对低成本、高性能音频接口的需求,设计了一种由下位机嵌入式系统和上位机计算机软件组成的电声测试系统专用音频接口。音频接口采用高速USB2.0接口传输音频数据,通过音频编解码器对音频信号进行D/A和A/D转换,实现播放和录音功能。经测试音频接口生成正弦信号的总谐波失真低于专业声卡;信号采集通道的幅频特性优于专业声卡;同步录音功能能够实现录音和播放完全同步。Aiming at low cost and high performance for audio interface requirements used in the electroacoustic testing system,a special audio interface is designed,which is composed of the slave computer embedded system and the host computer software.The audio interface uses high-speed USB2.0 interface to transmit audio data,and carries out D/A and A/D conversion through audio codec to achieve the function of playing and recording.By the test,the total harmonic distortion of sinusoidal signal generated by audio interface is lower than that of professional sound card;the amplitude frequency characteristic of the signal acquisition channel is better than that of the professional sound card;synchronous recording function enables full synchronization of recording and playing.

关 键 词：电声测试系统 音频接口 USB 音频编解码器 

分 类 号：TN912.2[电子电信—通信与信息系统]