JPS57154979A - Video signal mixing circuit system - Google Patents

Video signal mixing circuit system

Info

Publication number
JPS57154979A
JPS57154979A JP3974381A JP3974381A JPS57154979A JP S57154979 A JPS57154979 A JP S57154979A JP 3974381 A JP3974381 A JP 3974381A JP 3974381 A JP3974381 A JP 3974381A JP S57154979 A JPS57154979 A JP S57154979A
Authority
JP
Japan
Prior art keywords
display
circuit
video signal
signal
display signal
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
JP3974381A
Other languages
Japanese (ja)
Inventor
Koji Fujita
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 Denshi KK
Original Assignee
Hitachi Denshi KK
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 Denshi KK filed Critical Hitachi Denshi KK
Priority to JP3974381A priority Critical patent/JPS57154979A/en
Publication of JPS57154979A publication Critical patent/JPS57154979A/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
    • H04N5/265—Mixing

Landscapes

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

Abstract

PURPOSE:To realize an easy-to-see method for the mixed display signal, by having a producing circuit for the display signals of both positive and negative polarities and switching the display signal in accordance with the level of a video signal. CONSTITUTION:The video signal input (a) is divided into two parts by a dividing circuit 10. One of the divided two inputs is applied to a comparator 12 through an LPF11. A display signal producing circuit 14 is provided to a TV monitor to mix the display signal with the video signal and display them. The circuit 14 applies the signals of positive and negative polarities to a switch circuit 15 as the display signal. The comparator 12 compares the reference level given from a reference voltage circuit 13 with the output 6 of a low pass filter and controls the circuit 15 to switch a display signal (d) of positive polarity and a display signal (e) of negative polarity when the output (b) is large and small respectively. The selected display signal is mixed with the video signal at a mixing circuit 17 and through a level control circuit 16. Thus the mixed display is carried out in accordance with the level and gradation of the video signal to ensure an easy-to-see display.
JP3974381A 1981-03-19 1981-03-19 Video signal mixing circuit system Pending JPS57154979A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3974381A JPS57154979A (en) 1981-03-19 1981-03-19 Video signal mixing circuit system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3974381A JPS57154979A (en) 1981-03-19 1981-03-19 Video signal mixing circuit system

Publications (1)

Publication Number Publication Date
JPS57154979A true JPS57154979A (en) 1982-09-24

Family

ID=12561438

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3974381A Pending JPS57154979A (en) 1981-03-19 1981-03-19 Video signal mixing circuit system

Country Status (1)

Country Link
JP (1) JPS57154979A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63187973A (en) * 1987-01-30 1988-08-03 Ricoh Co Ltd Character data superimposing device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50106516A (en) * 1973-12-25 1975-08-22

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50106516A (en) * 1973-12-25 1975-08-22

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63187973A (en) * 1987-01-30 1988-08-03 Ricoh Co Ltd Character data superimposing device

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