If using odd parity, 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。
Usually set up a dedicated parity bit, it makes this group code "1" is odd or even.
通常专门设置一个奇偶校验位，用它使这组代码中“1”的个数为奇数或偶数。
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