JPS55109078A - Signal switching circuit - Google Patents
Signal switching circuitInfo
- Publication number
- JPS55109078A JPS55109078A JP1630679A JP1630679A JPS55109078A JP S55109078 A JPS55109078 A JP S55109078A JP 1630679 A JP1630679 A JP 1630679A JP 1630679 A JP1630679 A JP 1630679A JP S55109078 A JPS55109078 A JP S55109078A
- Authority
- JP
- Japan
- Prior art keywords
- camera
- cut
- circuit
- signal output
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To secure the projection of both the VTR reproduction picture and the camera picture images on the view finder through the automatic switching, by giving the ON/OFF control to the bias change-over switching element by the differential action of the differential amplifier provided previously.
CONSTITUTION: The camera signal sent from camera signal output circuit 1 is supplied to the base of differential amplifying transistor Tr4 and then amplified through camera signal output Tr2 to be supplied to camera/VTR signal output Tr1. The camera signal is then supplied to VTR signal output circuit 2 via resistance R9 to be recorded as well as projected onto the screen of view finder 3. In this case, base bias change-over Tr3 is cut off. The reproduction signal sent from circuit 2 is applied to Tr1 via resistance R9 and then to Tr6 of differential amplifier 5 via time constant circuit 4. As a result, Tr6 is cut off and Tr5 is turned on and Tr2 is also cut off. Thus the signal of circuit 1 is cut off, and only the reproduction signal is applied to finder 3 to secure the projection of the reproduced picture image onto the screen.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1630679A JPS55109078A (en) | 1979-02-14 | 1979-02-14 | Signal switching circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1630679A JPS55109078A (en) | 1979-02-14 | 1979-02-14 | Signal switching circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55109078A true JPS55109078A (en) | 1980-08-21 |
Family
ID=11912845
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1630679A Pending JPS55109078A (en) | 1979-02-14 | 1979-02-14 | Signal switching circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55109078A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4745478A (en) * | 1985-08-01 | 1988-05-17 | Nintendo Co., Ltd. | RF switch |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49119569A (en) * | 1973-03-15 | 1974-11-15 | ||
JPS5337415B1 (en) * | 1969-08-26 | 1978-10-09 |
-
1979
- 1979-02-14 JP JP1630679A patent/JPS55109078A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5337415B1 (en) * | 1969-08-26 | 1978-10-09 | ||
JPS49119569A (en) * | 1973-03-15 | 1974-11-15 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4745478A (en) * | 1985-08-01 | 1988-05-17 | Nintendo Co., Ltd. | RF switch |
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