公开(公告)号：US4771440A

公开(公告)日：1988-09-13

申请号：US937374

申请日：1986-12-03

申请人： Eric C. Fromm

发明人： Eric C. Fromm

IPC分类号： H03M5/08 ,  H04L25/48 ,  H04L25/49 ,  H04L27/10 ,  H04L27/18

CPC分类号： H04L25/4902

摘要： 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.