利用2FSK调制/解调的语音传输系统设计  

Design of Voice Transmission System Based on 2FSK Modulation/Demodulation

作　　者：李玉萍 张晓连 梁文海[1,2] Li Yuping;Zhang Xiaolian;Liang Wenhai(College of Physics and Electronic Engineering,Sichuan Normal University,Chengdu 610101,China;Key Laboratory of Wireless Sensor Network in Universities of Sichuan Province)

机构地区：[1]四川师范大学物理与电子工程学院,成都610101 [2]无线传感器网络四川省高校重点实验室

出　　处：《单片机与嵌入式系统应用》2020年第4期68-71,74,共5页Microcontrollers & Embedded Systems

摘　　要：根据2FSK调制解调的基本原理,以FPGA为核心设计了一种基于2FSK的语音传输系统。系统通过拾音电路、带通滤波以及A/D采集语音信号,利用频移键控法对该语音信号进行2FSK调制,并利用过零检测法完成2FSK解调,最后利用D/A转换和带通滤波实现语音信号的还原。经测试,语音传输系统接收端能完整恢复发送端的语音信号并无明显失真,整个系统具有成本低、速度快、稳定性高、可移植的优点。According to the basic principle of 2FSK modulation and demodulation,a 2FSK-based voice transmission system is designed with FPGA as the core.The system uses the frequency-shift keying method to perform 2FSK modulation on the voice signal through the pickup circuit,band-pass filtering and A/D acquisition of the voice signal,and completes the 2FSK demodulation by using the zero-crossing detection method.Finally,the D/A and bandpass are usedto enable the restoration of speech signals.After testing,the voice transmission system receiver can completely recover the voice signal of the transmitter without obvious distortion.The whole system has the advantages of low cost,high speed,high stability and portability.

关 键 词：EP4CE6E2C8N 2FSK 调制 解调 

分 类 号：TN912[电子电信—通信与信息系统] TN34[电子电信—信息与通信工程]