Reverse non return to zero code, Manchester code and differential Manchester code of common digital signal coding

Digital signal coding is to solve the problem of digital signal representation of digital data , That is, by encoding digital signals to represent data . The work of digital signal coding is generally completed by hardware , Common coding methods are as follows ： Reverse non return to zero code 、 Manchester code 、 Differential Manchester code .

Reverse non return to zero code ： encounter “0” transformation , encounter “1” keep

Manchester code It is a coding scheme that uses median transition to time .

characteristic ： There is a level jump in the middle of each clock cycle , This jump is used for synchronization , Can carry clock signal , And it can indicate whether there is data transmission

Difference Manchester code

characteristic ：1、 The differential Manchester code is the same as the Manchester code , But the anti-interference performance is better than that of Manchester coding

2、 Change the signal polarity at the beginning of the signal bit , To express logic "0"; The signal polarity is not changed at the beginning of the signal bit , To express logic "1"

 

                                                                        chart   Manchester code Differential Manchester code