公开(公告)号：EP0253623A3

公开(公告)日：1988-12-14

申请号：EP87306208

申请日：1987-07-14

申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

发明人： KAGEYAMA, SADASHI ,  ABE, YOSHIO ,  YASUMOTO, YOSHIO ,  INOUE, SHUJI ,  TAKAI, HITOSHI ,  MATSUMOTO, MITSUJIRO ,  AONO, KOUJI ,  UCHIMURA, KIYOSHI ,  IWASAKI, EIJI

IPC分类号： H04N5/21 ,  H04N5/44 ,  H04N7/08 ,  H04N7/085 ,  H04N7/087 ,  H04N11/24 ,  H04N11/00

CPC分类号： H04N7/0122 ,  H04N5/211 ,  H04N7/08 ,  H04N7/085 ,  H04N7/087 ,  H04N11/006 ,  H04N11/008

公开(公告)号：EP0097500A3

公开(公告)日：1986-12-30

申请号：EP83303510

申请日：1983-06-17

申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

发明人： MIKI, YUTAKA ,  NOZOE, TOSHIROU ,  UCHIMURA, KIYOSHI

IPC分类号： H04N9/64 ,  H04N9/535 ,  H04N9/537

CPC分类号： H04N9/641

摘要： A multiple display control apparatus for a television receiver used for displaying a plurality of signals on a display tube. In a case of switching a first signal output and a second signal output of a signal process circuit are switched by switching circuits, when the two output signals are about equal in the brightness level to each other, the picture is very indistinct. Thus, the first signal level is lowered by means of gain control circuits, the characteristic thereof depending on an output impedance of the signal process circuit and resistances. The control signals for switching and gain control are superposed each other as one signal, so that only one line is used for control signal.