JPS54100220A - Synchronous signal isolator circuit - Google Patents
Synchronous signal isolator circuitInfo
- Publication number
- JPS54100220A JPS54100220A JP620178A JP620178A JPS54100220A JP S54100220 A JPS54100220 A JP S54100220A JP 620178 A JP620178 A JP 620178A JP 620178 A JP620178 A JP 620178A JP S54100220 A JPS54100220 A JP S54100220A
- Authority
- JP
- Japan
- Prior art keywords
- diode
- circuit
- video signal
- synchronous
- voltage
- 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
- Synchronizing For Television (AREA)
Abstract
PURPOSE: To decrease the number of the component parts without lowering the performance of the synchronous isolator circuit by using the base saturation type clipping circuit instead of the clipping circuit using the differential amplifier.
CONSTITUTION: The composite video signal supplied to input terminal 1 is amplified through transistor 9 and 12 forming amplifier circuit 2 and then applied to clamping circuit 3. The tip of the synchronous signal is clamped by the voltage which is obtained by lowering the video signal from constant voltage source 18 by the voltage of diode 16 via capacitor 15, diode 16 and resistance 17. The clamped video signal is then lowered by the rise voltage of diode 19 via diode 19 and resistance 20 and applied to the base of Tr21 which functions as the clipping and amplifier circuits. Thus, the synchronous pulse synchronized with the synchronous signal of the composite video signal is delivered through the collector of Tr21 via Tr21.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP620178A JPS54100220A (en) | 1978-01-25 | 1978-01-25 | Synchronous signal isolator circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP620178A JPS54100220A (en) | 1978-01-25 | 1978-01-25 | Synchronous signal isolator circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54100220A true JPS54100220A (en) | 1979-08-07 |
Family
ID=11631919
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP620178A Pending JPS54100220A (en) | 1978-01-25 | 1978-01-25 | Synchronous signal isolator circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54100220A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61120583A (en) * | 1984-11-15 | 1986-06-07 | Matsushita Electric Ind Co Ltd | Synchronizing separation and clamping device |
JPS61120585A (en) * | 1984-11-15 | 1986-06-07 | Matsushita Electric Ind Co Ltd | Synchronizing signal separating and clamping circuit |
JPS6268370A (en) * | 1985-09-19 | 1987-03-28 | Matsushita Electric Ind Co Ltd | Pseudo synchronizing signal generating circuit |
-
1978
- 1978-01-25 JP JP620178A patent/JPS54100220A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61120583A (en) * | 1984-11-15 | 1986-06-07 | Matsushita Electric Ind Co Ltd | Synchronizing separation and clamping device |
JPS61120585A (en) * | 1984-11-15 | 1986-06-07 | Matsushita Electric Ind Co Ltd | Synchronizing signal separating and clamping circuit |
JPS6268370A (en) * | 1985-09-19 | 1987-03-28 | Matsushita Electric Ind Co Ltd | Pseudo synchronizing signal generating circuit |
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