公开(公告)号：WO1981002653A1

公开(公告)日：1981-09-17

申请号：PCT/US1981000177

申请日：1981-02-11

Applicant: WESTERN ELECTRIC CO INC

Inventor： WESTERN ELECTRIC CO INC ,  FENDERSON G ,  SKINNER M

IPC: H03K05/08

CPC classification number: H04L25/065 ,  H03K5/086 ,  H04L25/063

Abstract: The adaptive decision level circuit (FIG. 3) slices a digital signal with respect to a decision level disposed between the signal levels. A correction signal generated from the sliced signals (S, S) compensates for variations in the signal levels by maintaining the decision level at a constant position relative to the signal levels. The correction signal is generated by comparing (321) the integrated difference (on lead 305) between the sliced signal and its complement with the statistically expected value (312) of the difference between the sliced signal and its complement. In the preferred embodiment, the expected value is equal to one-half the signal swing of the sliced signal.