Decoding Method for Biphase-Encoded Data

A decoding method for biphase-encoded data having a plurality of bits wherein the logic value of a first bit of the bits is known, the logic value of one of the bits is a first logic value when the one of the bits has a transition from a first level to a second level at a time within a bit period, and the logic value of one of the bits is a second logic value when the one of the bits has a transition from the second level to the first level at the time within the bit period, the decoding method comprising:

• detecting specific transitions in the biphase-encoded data to obtain a time difference between each two adjacent specific transitions;
• when the time difference is 1 bit period and the logic value of a previous bit is the first logic value, determining that the logic value of a present bit is the first logic value;
• when the time difference is 1 bit period and the logic value of a previous bit is the second logic value, determining that the logic value of a present bit is the second logic value;
• when the time difference is 1.5 bit periods and the logic value of a previous bit is the first logic value, determining that the logic values of a present bit and a next bit are both the second logic value;
• when the time difference is 1.5 bit periods and the logic value of a previous bit is the second logic value, determining that the logic value of a present bit is the first logic value;
• and
• when the time difference is 2 bit periods and the logic value of a previous bit is the first logic value, determining that the logic values of a present bit and a next bit are the second logic value and the first logic value, respectively.