公开(公告)号：US3679977A

公开(公告)日：1972-07-25

申请号：US3679977D

申请日：1969-06-24

Applicant: BELL TELEPHONE LABOR INC

Inventor： HOWSON ROBERT D

IPC: H04L7/04 ,  H04L25/48 ,  H04L25/497 ,  H04B1/62 ,  H04B1/66

CPC classification number: H04L25/497 ,  H04L7/04

Abstract: A digital data transmission rate of three bits per cycle of bandwidth is achieved in precoded partial-response band-limited communication channels by partitioning binary digits into groups of three two-level digits and translating these binary groups of three into pairs of three-level digits prior to transmission. Correct pairwise association of received signals is accomplished by reserving a three-level digit pair of monitoring purposes. This reserved pair can validly occur only at a transition between allowable pairs. By monitoring the presence of the reserved pair, correct pairwise association of ternary digits is assured and binary digits are properly decoded without having to provide a special framing signal.

Abstract translation: 在预编码的部分响应限制通信信道中，通过将二进制数字分成三个两电平数字的组并将这三个二进制组转换为三位数字对，实现每个带宽周期三位的数字数据传输速率 在传输之前。 接收信号的正确配对关联是通过保留三级数字对的监视目的而实现的。 该保留对只能在允许对之间的转换时才有效。 通过监视保留对的存在，确保三进制数字的正确成对关联，并且二进制数字被适当地解码，而不必提供特殊的成帧信号。

公开(公告)号：US3492578A

公开(公告)日：1970-01-27

申请号：US3492578D

申请日：1967-05-19

Applicant: BELL TELEPHONE LABOR INC

Inventor： GERRISH ALLAN M ,  HOWSON ROBERT D

IPC: H04L25/497 ,  H04B1/10

CPC classification number: H04L25/497