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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。
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.
奇偶校验：加于一组二进制数字内的一个校验数元。它跟据系统逻辑，使总数为奇数或偶数。
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