JPS57193159A - Information transmitting device - Google Patents

Information transmitting device

Info

Publication number
JPS57193159A
JPS57193159A JP7824781A JP7824781A JPS57193159A JP S57193159 A JPS57193159 A JP S57193159A JP 7824781 A JP7824781 A JP 7824781A JP 7824781 A JP7824781 A JP 7824781A JP S57193159 A JPS57193159 A JP S57193159A
Authority
JP
Japan
Prior art keywords
power failure
failure
modulator
mark
transmission
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
JP7824781A
Other languages
Japanese (ja)
Inventor
Setsuya Yamazaki
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.)
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Original Assignee
Meidensha Corp
Meidensha Electric Manufacturing 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 Meidensha Corp, Meidensha Electric Manufacturing Co Ltd filed Critical Meidensha Corp
Priority to JP7824781A priority Critical patent/JPS57193159A/en
Publication of JPS57193159A publication Critical patent/JPS57193159A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To make transmission of power failure information surely without a limit of frequency band with a simple constitution, by transmitting a modulated output of fixed transmission when a commercial power supply is in failure and discriminating it at the reception side as the power failure through the detection of a long pulse. CONSTITUTION:When a commercial power supply is in failure, a power failure detecting relay 15 is inoperative, contacts 15K1 and 15K2 are changed over, a power is supplied to a modulator 13 from a battery 16 in place of a power supply 14, and a mark or a space hold signal is inputted from a generating section 17 in place of the output of a modulator 12. Thus, the output of the modulator 13 is a fixed transmission. On the other hand, at the reception side, alternate transmission of mark and space in the reception frequency is fixed into either the mark or the space due to power failure. This is detected at a detecting circuit 25 and it is discriminated as the power failure when the detected signal is in opposite phase to a long pulse generated at the interruption of line.
JP7824781A 1981-05-23 1981-05-23 Information transmitting device Pending JPS57193159A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7824781A JPS57193159A (en) 1981-05-23 1981-05-23 Information transmitting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7824781A JPS57193159A (en) 1981-05-23 1981-05-23 Information transmitting device

Publications (1)

Publication Number Publication Date
JPS57193159A true JPS57193159A (en) 1982-11-27

Family

ID=13656669

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7824781A Pending JPS57193159A (en) 1981-05-23 1981-05-23 Information transmitting device

Country Status (1)

Country Link
JP (1) JPS57193159A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5555646A (en) * 1978-10-20 1980-04-23 Toshiba Corp Failure detection system for remote monitor system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5555646A (en) * 1978-10-20 1980-04-23 Toshiba Corp Failure detection system for remote monitor system

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