公开(公告)号：US3593141A

公开(公告)日：1971-07-13

申请号：US3593141D

申请日：1969-09-26

Applicant: BELL TELEPHONE LABOR INC

Inventor： BROWN EARL F ,  KAMINSKI WILLIAM ,  LIMB JOHN O ,  MOUNTS FRANK W

IPC: H03M3/04 ,  H04B14/06 ,  H04L25/48 ,  H04B1/00

CPC classification number: H03M3/04

Abstract: A differential pulse code communication system is disclosed with sign prediction coding which reduces the number of digits required to describe the levels produced in the quantization of the differential signal. In the system the sign of the largest positive and negative levels of the quantizer are predicted by assuming that they have the same sign as the previous level. If the prediction is wrong a lower level with the correct sign is transmitted rather than the level with the predicted sign. Because of the prediction, additional levels may be added in the quantizer in the space otherwise reserved for the signs predicted without increasing the pulse rate of the system.

公开(公告)号：US3439753A

公开(公告)日：1969-04-22

申请号：US3439753D

申请日：1966-04-19

Applicant: BELL TELEPHONE LABOR INC

Inventor： MOUNTS FRANK W ,  PRASADA BIRENDRA

IPC: H03M7/00 ,  H03M7/30 ,  H04N7/26 ,  H04N7/00 ,  H04B1/04

CPC classification number: H03M7/3044 ,  H03M7/3053 ,  H04N19/90

公开(公告)号：US3241067A

公开(公告)日：1966-03-15

申请号：US10460961

申请日：1961-04-21

Applicant: BELL TELEPHONE LABOR INC

Inventor： JAMES DENNIS B ,  MOUNTS FRANK W

IPC: H04L7/04

CPC classification number: H04L7/048