JPS54100220A - Synchronous signal isolator circuit - Google Patents

Synchronous signal isolator circuit

Info

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
Application number
JP620178A
Other languages
Japanese (ja)
Inventor
Hidekazu Funashiro
Shigeru Ishikawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP620178A priority Critical patent/JPS54100220A/en
Publication of JPS54100220A publication Critical patent/JPS54100220A/en
Pending legal-status Critical Current

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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
JP620178A 1978-01-25 1978-01-25 Synchronous signal isolator circuit Pending JPS54100220A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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