基于FSK商品查询的通信协议研究

Commodity Checking Communication Protocol Based on FSK

频移键控技术是用数字信号去调制载波的频率。介绍了频移键控技术在查询终端机和语音服务器之间的应用,设计了用于商品查询机和语音服务器之间进行数据交换的系统。在数据的交互过程中,除了协商的数据包的格式外,还增加了循环冗余校验,使得数据传输的效率和可靠性大大提高。

FSK(Frequency-shift keying) signal is used as a digital frequency modulated carrier.FSK signal demodulation is divided into coherent assay and incoherent method,the application of transmission data between terminal and audio server through FSK is introduced in this paper.The application shows that the system has better performance of anti-noise and anti-attenuation,and more efficient of data transmission,it is very suitable for low-speed transmission.