JPS56158585A - Mixing circuit of video signal without addition - Google Patents

Mixing circuit of video signal without addition

Info

Publication number
JPS56158585A
JPS56158585A JP6325880A JP6325880A JPS56158585A JP S56158585 A JPS56158585 A JP S56158585A JP 6325880 A JP6325880 A JP 6325880A JP 6325880 A JP6325880 A JP 6325880A JP S56158585 A JPS56158585 A JP S56158585A
Authority
JP
Japan
Prior art keywords
video signals
signals
fed
luminance
switching
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
JP6325880A
Other languages
Japanese (ja)
Inventor
Toshiro Watanabe
Akira Suzuki
Yasuo Suzuki
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP6325880A priority Critical patent/JPS56158585A/en
Publication of JPS56158585A publication Critical patent/JPS56158585A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/74—Circuits for processing colour signals for obtaining special effects
    • H04N9/76—Circuits for processing colour signals for obtaining special effects for mixing of colour signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

PURPOSE:To suppress the mixing and switching at high band by a chroma signal at mixing without addition and to increase the color reproducibility around the switching boundary, by making the switching control for 2 video signals through the result of comparison between the amplitudes of luminance signal level for two video signals. CONSTITUTION:Color video signals from input terminals 21, 26 are fed to adders 23, 28, control signals F1, F2 are added at adders 23, 28, and color video signals VA, VB are produced and fed to separation circuits 24, 29 and also fed to a switch 30. The chroma component is eliminated from the two video signals VA, VB for the separation circuits 24, 29 and luminance signals VAr, VBr are fed to a comparison circuit 25. Further, at the circuit 25, the luminance level of the luminance signals VAr, VBr is compared, a switching signal S is produced to control a switch 30, and either one of the video signals VA, VB is selected to output a mixed output video signal C to an output terminal 32 via a video clamp circuit 31.
JP6325880A 1980-05-12 1980-05-12 Mixing circuit of video signal without addition Pending JPS56158585A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6325880A JPS56158585A (en) 1980-05-12 1980-05-12 Mixing circuit of video signal without addition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6325880A JPS56158585A (en) 1980-05-12 1980-05-12 Mixing circuit of video signal without addition

Publications (1)

Publication Number Publication Date
JPS56158585A true JPS56158585A (en) 1981-12-07

Family

ID=13224053

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6325880A Pending JPS56158585A (en) 1980-05-12 1980-05-12 Mixing circuit of video signal without addition

Country Status (1)

Country Link
JP (1) JPS56158585A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0518465A2 (en) * 1991-06-14 1992-12-16 The Grass Valley Group, Inc. Non-additive video mixer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0518465A2 (en) * 1991-06-14 1992-12-16 The Grass Valley Group, Inc. Non-additive video mixer
US5850267A (en) * 1991-06-14 1998-12-15 Tektronix, Inc. Non-additive video mixer

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