JPS554746A - Video signal clamp circuit - Google Patents

Video signal clamp circuit

Info

Publication number
JPS554746A
JPS554746A JP7741278A JP7741278A JPS554746A JP S554746 A JPS554746 A JP S554746A JP 7741278 A JP7741278 A JP 7741278A JP 7741278 A JP7741278 A JP 7741278A JP S554746 A JPS554746 A JP S554746A
Authority
JP
Japan
Prior art keywords
capacitor
transistor
clamping
synchronizing signals
current
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.)
Granted
Application number
JP7741278A
Other languages
Japanese (ja)
Other versions
JPS6224990B2 (en
Inventor
Kazuo Kondo
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 JP7741278A priority Critical patent/JPS554746A/en
Publication of JPS554746A publication Critical patent/JPS554746A/en
Publication of JPS6224990B2 publication Critical patent/JPS6224990B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Picture Signal Circuits (AREA)

Abstract

PURPOSE: To clamp emphasized video signals accurately with a high response by connecting not only a high-voltage power source but also a current source, which increases a current value, to the other end of a clamping capacitor.
CONSTITUTION: Video synchronizing signals with overshoot inputted from the terminal 2 are emphasized by the pre-emphasis circuit 3 and are applied to the clamping capacitor 19. Meanwhile, a clamping key pulse is applied from the terminal 1; and the switches 42 and 29 are closed during this pulse period, and the other end of the capacitor 19 is connected to not only the high-voltage power source VCC through the conductive transistor 28 but also the constant power source 30 by the switch 29, and the capacitor 19 is charged by the current flowing through the transistor 28, switch 29 and current source 30, thereby clamping the leading edge of video synchronizing signals. In the period other than this period, the transistor 28 is turned off, and the overshoot of video synchronizing signals is not clamped; and when the potential of video synchronizing signals is inverted to the positive side, the transistor 28 is turned off and the discharge current of the capacitor 19 flows to the current source 30.
COPYRIGHT: (C)1980,JPO&Japio
JP7741278A 1978-06-28 1978-06-28 Video signal clamp circuit Granted JPS554746A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7741278A JPS554746A (en) 1978-06-28 1978-06-28 Video signal clamp circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7741278A JPS554746A (en) 1978-06-28 1978-06-28 Video signal clamp circuit

Publications (2)

Publication Number Publication Date
JPS554746A true JPS554746A (en) 1980-01-14
JPS6224990B2 JPS6224990B2 (en) 1987-06-01

Family

ID=13633206

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7741278A Granted JPS554746A (en) 1978-06-28 1978-06-28 Video signal clamp circuit

Country Status (1)

Country Link
JP (1) JPS554746A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51128249A (en) * 1975-05-01 1976-11-09 Seiko Instr & Electronics Ltd Dc-part regenerator
JPS5233932A (en) * 1975-09-10 1977-03-15 Tokuyama Sekisui Kogyo Kk Improver of weathring resistance and heat stability of synthetic resin

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51128249A (en) * 1975-05-01 1976-11-09 Seiko Instr & Electronics Ltd Dc-part regenerator
JPS5233932A (en) * 1975-09-10 1977-03-15 Tokuyama Sekisui Kogyo Kk Improver of weathring resistance and heat stability of synthetic resin

Also Published As

Publication number Publication date
JPS6224990B2 (en) 1987-06-01

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