H - Electricity – 04 – L
Patent
H - Electricity
04
L
354/232
H04L 25/49 (2006.01)
Patent
CA 1146672
HENRY-8 ZERO DISPARITY CODING/DECODING SYSTEM Abstract In a digital transmission system, disparity is defined as the difference between the number of binary digits at each code state. The generation of a block of binary digits having zero disparity possesses many advantages. The present invention discloses coding apparatus for converting a block of binary digits having random disparity into a zero disparity block, and vice versa. The coder accomplishes this translation by determining the disparity of the random disparity block and then selecting a bit position which divides the block into two digit segments each having half this disparity. Inversion of either digit segment generates a zero disparity block. For decoding, data representing the bit position selected is transmitted along with the zero disparity block. The binary digits previously inverted by the coder are then reinverted. This coding/decoding technique is adaptable to any block size having an even number of binary digits.
371611
Kirby Eades Gale Baker
Western Electric Company Incorporated
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