JPS57142076A - Video switching device - Google Patents

Video switching device

Info

Publication number
JPS57142076A
JPS57142076A JP2674881A JP2674881A JPS57142076A JP S57142076 A JPS57142076 A JP S57142076A JP 2674881 A JP2674881 A JP 2674881A JP 2674881 A JP2674881 A JP 2674881A JP S57142076 A JPS57142076 A JP S57142076A
Authority
JP
Japan
Prior art keywords
control data
register
data signal
registers
lines
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
JP2674881A
Other languages
Japanese (ja)
Inventor
Yoshinori Mima
Ikuo Morii
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.)
YASUDA DENKEN KK
Hitachi Denshi KK
Original Assignee
YASUDA DENKEN KK
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 YASUDA DENKEN KK, Hitachi Denshi KK filed Critical YASUDA DENKEN KK
Priority to JP2674881A priority Critical patent/JPS57142076A/en
Publication of JPS57142076A publication Critical patent/JPS57142076A/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
    • H04N5/268—Signal distribution or switching

Abstract

PURPOSE:To switch a video signal of different bus lines in the same timing as a vertical synchronizing pulse, by providing a buffer register between a register corresponding to a control data signal of a computer and a switching register. CONSTITUTION:A control data signal applied by a plurality of times from an output port of a computer is set to a register 208 during one period of a vertical synchronizing pulse, an upper-order 4-bit control data signal is decoded and BUS lines up to 16 lines are designated, and lower-order 4-bit control data signal is stored in buffer registers 203 and 206 provided at each BUS. An output signal of the buffer registers 203 and 206 sets switching registers 202 and 205 provided at each BUS in the same timing with the pulse VP. An output signal of the registers 202 and 205 is decoded with decoders 201 and 204 and a video signal on a pluraity of lines is selected with the same timing in vertical synchronism by controlling the cross point of video switching.
JP2674881A 1981-02-27 1981-02-27 Video switching device Pending JPS57142076A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2674881A JPS57142076A (en) 1981-02-27 1981-02-27 Video switching device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2674881A JPS57142076A (en) 1981-02-27 1981-02-27 Video switching device

Publications (1)

Publication Number Publication Date
JPS57142076A true JPS57142076A (en) 1982-09-02

Family

ID=12201909

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2674881A Pending JPS57142076A (en) 1981-02-27 1981-02-27 Video switching device

Country Status (1)

Country Link
JP (1) JPS57142076A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60176378A (en) * 1984-01-16 1985-09-10 ザ・グラス・バレー・グループ・インコーポレイテッド Switch unit
JPS62200989A (en) * 1986-02-28 1987-09-04 Fuji Photo Film Co Ltd Signal changeover device
EP0502673A2 (en) * 1991-03-04 1992-09-09 Matsushita Electric Industrial Co., Ltd. Video signal switching apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60176378A (en) * 1984-01-16 1985-09-10 ザ・グラス・バレー・グループ・インコーポレイテッド Switch unit
JPH0554757B2 (en) * 1984-01-16 1993-08-13 Grass Valley Group
JPS62200989A (en) * 1986-02-28 1987-09-04 Fuji Photo Film Co Ltd Signal changeover device
EP0502673A2 (en) * 1991-03-04 1992-09-09 Matsushita Electric Industrial Co., Ltd. Video signal switching apparatus

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