基于FPGA的自由空间音频信号传输及频谱显示系统  

Free Space Transmission of Audio Signals and Spectrum Display System Based on FPGA

作　　者：杨丹[1] 毛昱枫 于虹[1] 

机构地区：[1]东南大学电子科学与工程学院,南京210096

出　　处：《电子器件》2015年第4期817-820,共4页Chinese Journal of Electron Devices

摘　　要：自由空间光通信技术随着设备成本的下降,相关应用也在不断扩展。基于自由空间光通信技术,我们搭建了一个音频信号传输系统。以声音信号调制的激光作为信号源,采用光电晶体管及其反馈电路对信号进行接收,并使用FPGA组成的控制电路实现信号解调,还原初始信号。同时实现了FIR滤波,FFT变换和VGA时序。我们完成了系统搭建和测试,实现了高识别率、低成本的自由空间音频信号传输及频谱显示。With the decline in the cost of equipment of free space optical communication technology,related applications are also expanding. We built an audio signal transmission system based on free-space optical communications technology. One laser beam is modulated by a voice signal,and then transmited in the air. It is demodulated on a receiver consisting of a phototransistor,a feedback circuit and a control model. The original audio signal is finally obtained by a control circuit composed of FPGA for demodulation. The system achieves FIR filtering,FFT transform and VGA timing. We have completed the system and the experimental results show that a high recognition rate,lowcost free-space audio signal transmission and spectrum display system is realized.

关 键 词：大气光通信 音频信号传输 动态频谱显示 FPGA 

分 类 号：TN929.12[电子电信—通信与信息系统]