公开(公告)号：US3665107A

公开(公告)日：1972-05-23

申请号：US3665107D

申请日：1970-11-13

申请人： AUTOMATIC ELECT LAB

发明人： KOPEC THOMAS J ,  MORSTADT RICHARD A

IPC分类号： H04M11/06

CPC分类号： H04M11/06

摘要： A circuit for use in a data set that permits the user to monitor acknowledgment tones or voice signals from a distant data receiving station, as well as permitting monitoring of tones representing data transmitted by the user''s own station. Signal muting of both the data set telephone receiver and an extension telephone are provided to limit the tone levels, as well as isolation from the telephone line to reduce impedance mismatching.

公开(公告)号：US3524935A

公开(公告)日：1970-08-18

申请号：US3524935D

申请日：1967-12-19

申请人： AUTOMATIC ELECT LAB

发明人： GONSEWSKI LEONARD E ,  MORSTADT RICHARD A

IPC分类号： H04M11/06 ,  H04M1/00

CPC分类号： H04M11/06