JPS5597012A - Signal switching circuit - Google Patents
Signal switching circuitInfo
- Publication number
- JPS5597012A JPS5597012A JP129179A JP129179A JPS5597012A JP S5597012 A JPS5597012 A JP S5597012A JP 129179 A JP129179 A JP 129179A JP 129179 A JP129179 A JP 129179A JP S5597012 A JPS5597012 A JP S5597012A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- transistor
- vtr
- deterioration
- supplied
- 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
Landscapes
- Television Signal Processing For Recording (AREA)
- Electronic Switches (AREA)
Abstract
PURPOSE: To avoid the deterioration of the picture quality S/N caused by the mode of VTR or the like, the crosstalk occurrence and others by switching the signal routes via the transistor of differential structure and the like.
CONSTITUTION: When transistor 30 is cut off with the control signal featuring a low level, the base potential of transistor 32 increases. Thus transistors 32 and 31 are turned on and off respectively since the base potential of differentially-connected transistor 31 is lowered by the voltage caused by diode D1. Then constant current I flows via resistance 23, and only signal S2 amplified via transistors 20 and 21 is supplied to load 26 with the supply of signal S1 blocked. In the same way, only signal S1 is supplied to load 26 when the control signal is set to a high level. And thus the signal route is switched to the prescribed route at the mode switching time of the VTR or the like to secure the identical characteristics for the signal routes. As a result, the deterioration of S/N, occurrence of the crosstalk and others can be avoided. At the same time, the effect of the temperature can be prevented owing to the differential structure.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP129179A JPS5597012A (en) | 1979-01-12 | 1979-01-12 | Signal switching circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP129179A JPS5597012A (en) | 1979-01-12 | 1979-01-12 | Signal switching circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5597012A true JPS5597012A (en) | 1980-07-23 |
Family
ID=11497351
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP129179A Pending JPS5597012A (en) | 1979-01-12 | 1979-01-12 | Signal switching circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5597012A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5065209A (en) * | 1973-10-11 | 1975-06-02 |
-
1979
- 1979-01-12 JP JP129179A patent/JPS5597012A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5065209A (en) * | 1973-10-11 | 1975-06-02 |
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