JPS56102177A - Character and pattern signal superposing circuit - Google Patents

Character and pattern signal superposing circuit

Info

Publication number
JPS56102177A
JPS56102177A JP460780A JP460780A JPS56102177A JP S56102177 A JPS56102177 A JP S56102177A JP 460780 A JP460780 A JP 460780A JP 460780 A JP460780 A JP 460780A JP S56102177 A JPS56102177 A JP S56102177A
Authority
JP
Japan
Prior art keywords
signal
circuit
character
stated
level
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
JP460780A
Other languages
Japanese (ja)
Inventor
Nobuo Onuki
Masutomi Oota
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 JP460780A priority Critical patent/JPS56102177A/en
Publication of JPS56102177A publication Critical patent/JPS56102177A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/222—Studio circuitry; Studio devices; Studio equipment
    • H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
    • H04N5/278—Subtitling

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Studio Circuits (AREA)
  • Television Systems (AREA)

Abstract

PURPOSE:To make it possible to keep characters superposed by television (TV) video signals always a constant brightness by applying pulses with large amplitude to the part where character signals of TV video signals are superposed so as to be reverse polarity and making the levels of character signals uniform. CONSTITUTION:Video signal A, character signal B and subtracted pulse signal d', which is obtained by amplifying the pulse of signal B up to a stated amplitude, are applied to terminals 1, 3 and 3' respectively. Pulse signal -d' with reverse polarity is superposed to the stated part of signal A by subtraction circuit 25 and output signal D of circuit 25 is entered into DC restoration circuit 26. Circuit 26 uniforms variable DC leves to a stated standard level and supplies level-uniformed signals to clip circuit 27. Circuit 27 clips signal D with clip level CL which is lower than the stated standard level and thus original signal A is supplied to character signal insertion circuit 28 as a clipped signal up to CL with signal d'. After being delayed for a stated period after signal d' by delay circuit 29, signal B is applied to circuit 28 and inserted into the clipped places with some gaps to output video signal E with a constant character signal level.
JP460780A 1980-01-21 1980-01-21 Character and pattern signal superposing circuit Pending JPS56102177A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP460780A JPS56102177A (en) 1980-01-21 1980-01-21 Character and pattern signal superposing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP460780A JPS56102177A (en) 1980-01-21 1980-01-21 Character and pattern signal superposing circuit

Publications (1)

Publication Number Publication Date
JPS56102177A true JPS56102177A (en) 1981-08-15

Family

ID=11588727

Family Applications (1)

Application Number Title Priority Date Filing Date
JP460780A Pending JPS56102177A (en) 1980-01-21 1980-01-21 Character and pattern signal superposing circuit

Country Status (1)

Country Link
JP (1) JPS56102177A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0323851A2 (en) * 1988-01-08 1989-07-12 BULGARSKA TELEVISIA kam KOMITET sa TELEVISIA i RADIO Method and apparatus for entering symbols into a programme televion signal
RU2575875C1 (en) * 2015-02-02 2016-02-20 Федеральное государственное бюджетное учреждение науки Институт космофизических исследований и аэрономии им. Ю.Г. Шафера Сибирского отделения Российской академии наук Method of transmitting data in frame of standard video signal

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4421763Y1 (en) * 1968-08-29 1969-09-16

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4421763Y1 (en) * 1968-08-29 1969-09-16

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0323851A2 (en) * 1988-01-08 1989-07-12 BULGARSKA TELEVISIA kam KOMITET sa TELEVISIA i RADIO Method and apparatus for entering symbols into a programme televion signal
RU2575875C1 (en) * 2015-02-02 2016-02-20 Федеральное государственное бюджетное учреждение науки Институт космофизических исследований и аэрономии им. Ю.Г. Шафера Сибирского отделения Российской академии наук Method of transmitting data in frame of standard video signal

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