If using oddparity, then when the receiver receives this set of code, check the "1" if the number is odd, to determine the transmission code is correct.
若用奇校验，则当接收端收到这组代码时，校验“1”的个数是否为奇数，从而确定传输代码的正确性。
2
Parity bit: a check bit added to a series of binary digits to make the total odd or even according to the logic of the system.