Alternate mark/space inversion line code

A method of communicating information originating in the form of a stream of binary digital data D1 occurring at a predetermined data rate, comprising the steps of:

• encoding said digital data stream into first and second binary signal sequences S1 and S2 having predetermined first and second logic level, such that (1) a first occurrence of a logic "1" in said digital data stream D1 is encoded into the same logic level in both said first and second binary signal sequences and a first occurrence of a logic "0" in said digital data stream D1 is encoded into opposite logic levels in said first and second binary signal sequences, and (2) each subsequent occurrence of a logic "1" or logic "0" in digital data stream D1 in encoded into a level opposite the immediately prior level representing a logic "1" or logic "0" in each of the binary signal sequences S1 and S2,
• transmitting said binary signal sequences S1 and S2 over a distance, and
• receiving said transmitted binary signal sequences S1 and S2 and decoding said binary signal sequences to generate a stream of binary digital data corresponding to said digital data stream D1.

A communication system for information in the form of stream of binary digital data D1 occurring at a predetermined data rate, comprising:

• means for encoding said digital data stream into first and second binary signal sequences S1 and S2 having predetermined first and second logic levels, said encoding 'means responding to said digital data stream such that (1) a first occurrence of logic "1" in said digital data stream D1 is encoded into the same logic level in both said first and second binary signal sequences and a first occurrence of a logic "0" in said digital data stream D1 is encoded into opposite logic levels in said first and second binary signal sequences, and (2) each subsequent occurrence of a logic "1" or logic "0" in digital data stream D1 in encoded into a level opposite the immediately prior level representing a logic "1" or logic "0" in each of the binary signal sequences S1 and S2,
• means for transmitting said binary signal sequences over a distance, and
• means for receiving said transmitted binary signal sequences S1 and S2 and for decoding said binary signal sequences to generate a stream of binary digital data corresponding to said digital data stream D1.