JPS5644278A - Video signal transmission line supervisory system - Google Patents

Video signal transmission line supervisory system

Info

Publication number
JPS5644278A
JPS5644278A JP12015779A JP12015779A JPS5644278A JP S5644278 A JPS5644278 A JP S5644278A JP 12015779 A JP12015779 A JP 12015779A JP 12015779 A JP12015779 A JP 12015779A JP S5644278 A JPS5644278 A JP S5644278A
Authority
JP
Japan
Prior art keywords
signal
supervisory
video signal
pilot signal
synchronizing 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
JP12015779A
Other languages
Japanese (ja)
Inventor
Yoshihiko Miyano
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 JP12015779A priority Critical patent/JPS5644278A/en
Publication of JPS5644278A publication Critical patent/JPS5644278A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/06—Monitoring of the line circuits, e.g. signalling of line faults

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Abstract

PURPOSE:To improve the supervisory function, by supervising the synchronizing signal included in the video signal besides the pilot signal and by combining supervisory results of both signals. CONSTITUTION:The video signal transmitted from transmission part 1 through the video signal transmission line (line 2 and realy 3) is received by terminal unit 4, and existence of the synchronizing signal and level properness are detected by synchronizing signal supervisory part 5, and existence of the pilot signal is detected by pilot signal supervisory part 6. In this case, if normalcy detection signals are transmitted from synchronizing signal supervisory part 5 as well as pilot signal supervisory part 6, no abnormal alarm output is transmitted from alarm terminal ALM because these signals pass through AND 7 and inverter 8. Meanwhile, if one or both of the pilot signal and the synchronizing signal are not received normally, the output of AND 7 is low-level and is inverted by inverter 8, and abnormal alarm is output from alarm terminal ALM.
JP12015779A 1979-09-20 1979-09-20 Video signal transmission line supervisory system Pending JPS5644278A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12015779A JPS5644278A (en) 1979-09-20 1979-09-20 Video signal transmission line supervisory system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12015779A JPS5644278A (en) 1979-09-20 1979-09-20 Video signal transmission line supervisory system

Publications (1)

Publication Number Publication Date
JPS5644278A true JPS5644278A (en) 1981-04-23

Family

ID=14779357

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12015779A Pending JPS5644278A (en) 1979-09-20 1979-09-20 Video signal transmission line supervisory system

Country Status (1)

Country Link
JP (1) JPS5644278A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03273792A (en) * 1990-03-23 1991-12-04 Nec Corp Video line monitoring circuit
CN110677642A (en) * 2019-11-15 2020-01-10 冠捷显示科技（厦门）有限公司 Television fault online detection method and device based on LED indicator lamp

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03273792A (en) * 1990-03-23 1991-12-04 Nec Corp Video line monitoring circuit
CN110677642A (en) * 2019-11-15 2020-01-10 冠捷显示科技（厦门）有限公司 Television fault online detection method and device based on LED indicator lamp

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