Pulse or digital communications – Repeaters – Testing
Patent
1986-12-03
1988-09-13
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 22, 332 16R, H04L 2710, H04L 2718
Patent
active
047714409
ABSTRACT:
A data modulation interface is provided for serial data transmission. A biphase signal is encoded with the binary bits of a parallel data word. The bits of the parallel data word are examined to determine whether there are more one bits or zero bits in the word. A polarity bit is provided in addition to the other bits to indicate which bit-state occurred most often. The biphase signal is modulated to create different time intervals between phase reversals with one time interval corresponding to a bit-state of one and another time interval corresponding to a bit-state of zero. The shortest time interval is assigned to correspond to the bit-state occurring most often in the word so that the total time required to transmit each word is minimized. A time interval can be assigned to a sync signal transmitted after each parallel data word. A time interval can also be assigned to correspond to plural bit combinations so they can be represented by a single phase interval and transmitted quickly.
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Chin Stephen
Cray Research Inc.
Griffin Robert L.
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