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目的:讨论浅谈差错控制方法。方法:查阅文献资料并结合个人经验进行归纳总结。结论:信号在物理信道中传输时,线路本身电器特性造成的随机噪声、信号幅度的衰减、频率和相位的畸变、电器信号在线路上产生反射造成的回音效应、相邻线路间的串扰以及各种外界因素都会造成信号的失真。在数据通信中,这些因素将会使接收端收到的二进制数位和发送端实际发送的二进制数位不一致,从而造成由“0”变成“l”或由“1”变成“0”的差错。
Purpose: To discuss the error control method. Methods: Review the literature and combined with personal experience to summarize. Conclusion: When the signal is transmitted in the physical channel, the random noise caused by the electrical characteristics of the circuit itself, the attenuation of the signal amplitude, the distortion of the frequency and the phase, the echo effect caused by the reflection of the electrical signal on the line, the crosstalk between adjacent lines, External factors can cause signal distortion. In data communication, these factors will make the binary digits received by the receiving end inconsistent with the binary digits actually sent by the sending end, resulting in the change from “0 ” to “l ” or from “1” to “ Into ”0 " error.