一种基于nRF2401的无线语音通信的实现

Application of Wireless Voice Communication Based on nRF2401

介绍了一种基于nRF2401的无线语音通信系统。发送方的语音经A/D采样和由AT-mega16单片机进行CVSD(连续可变斜率增量调制)编码后发送至nRF2401进行无线传输;接收方由ATmega16接收数据并进行CVSD解码,经D/A转换、滤波、功放等电路,最后由扬声器放音。该系统能实现实时半双工通信,具有可加密、可存储录音并随时回放的特点,在采样率为8 kHz时,语音存储时间可达约4 min。经调试,音质良好且有效通信距离可达100 m,可方便地应用于无线教学系统等短距离通信场合。

A kind of short distance wireless voice communication system based on nRF2401 is realized. The voice of the sending side is first sampled by A/D, then MCU takes the CVSD coding and sending data to nRF2401 to realize the wireless transmission. The receiveing side receives data transfered by nRF2401 and MCU accepts the CVSD decoding. With the help of D/A, audio filtering and amplification, the voice can be heard finally using a speaker. The system can realize real time semiduplex communication, have the characteristic of encryptability, store the record and playback the record at any time. The storage time of voice can reach up to four minites at the sampling rate of 8kHz. After debugging, the tone is good and the communication distance can reach to one hundred meters. So it can be used conveniently in some situations such as wireless teaching and learning system and have some other applications.