JPS56132883A - Adding and mixing circuit of digital picture signal - Google Patents

Adding and mixing circuit of digital picture signal

Info

Publication number
JPS56132883A
JPS56132883A JP3667780A JP3667780A JPS56132883A JP S56132883 A JPS56132883 A JP S56132883A JP 3667780 A JP3667780 A JP 3667780A JP 3667780 A JP3667780 A JP 3667780A JP S56132883 A JPS56132883 A JP S56132883A
Authority
JP
Japan
Prior art keywords
picture signal
digital
digital picture
black level
mixing circuit
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
JP3667780A
Other languages
Japanese (ja)
Inventor
Toshiro Watanabe
Akira 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 JP3667780A priority Critical patent/JPS56132883A/en
Publication of JPS56132883A publication Critical patent/JPS56132883A/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)

Abstract

PURPOSE:To constitute a circuit so that a black level of an adding and mixing output picture signal is not varied, in case plural digital input picture signals are added and mixed, by setting in advance a black level of the digital input picture signal to ''0'' by a digital value. CONSTITUTION:A digital picture signal A by which a black level is made 40 by a digital value is level-shifted so that a black level becomes ''0'' by a digital value by the clamping circuit 1, and it becomes a digital picture signal A'. In the same way, a digital picture signal B is converted to a digital picture signal B' by which a digital value of a black level is made ''0'', by the clamping circuit 2. Said digital picture signal A' and digital picture signal B' are input to the adder 3, the result of said addition is led to the output terminal, and a digital picture signal C is output.
JP3667780A 1980-03-21 1980-03-21 Adding and mixing circuit of digital picture signal Pending JPS56132883A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3667780A JPS56132883A (en) 1980-03-21 1980-03-21 Adding and mixing circuit of digital picture signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3667780A JPS56132883A (en) 1980-03-21 1980-03-21 Adding and mixing circuit of digital picture signal

Publications (1)

Publication Number Publication Date
JPS56132883A true JPS56132883A (en) 1981-10-17

Family

ID=12476477

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3667780A Pending JPS56132883A (en) 1980-03-21 1980-03-21 Adding and mixing circuit of digital picture signal

Country Status (1)

Country Link
JP (1) JPS56132883A (en)

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