JPS562788A - Order telephone service system - Google Patents

Order telephone service system

Info

Publication number
JPS562788A
JPS562788A JP7781779A JP7781779A JPS562788A JP S562788 A JPS562788 A JP S562788A JP 7781779 A JP7781779 A JP 7781779A JP 7781779 A JP7781779 A JP 7781779A JP S562788 A JPS562788 A JP S562788A
Authority
JP
Japan
Prior art keywords
station
tone
order telephone
telephone signal
output
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
JP7781779A
Other languages
Japanese (ja)
Inventor
Mutsuo Tsunoda
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP7781779A priority Critical patent/JPS562788A/en
Publication of JPS562788A publication Critical patent/JPS562788A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N17/00—Diagnosis, testing or measuring for television systems or their details

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Radio Relay Systems (AREA)
  • Details Of Television Systems (AREA)

Abstract

PURPOSE:To eliminate restrictions on the system constitution without requiring a private radio line for order telephones to the same direction, by providing two sets of MODEMs, a tone generator, a tone detector, and a switch in each repeater station. CONSTITUTION:In case of service from the B station in repeater station 2 to the A station, tone is input from tone oscillator 25 to order telephone signal input point 15 in the B station and is output to TV sound signal output point 14 through transmission line 22. This tone is detected by tone detector 24 to not only switch sound demodulator 19 from the CH-B side to the CH-A side but also switch sound modulator 20 from the CH-A side to the CH-B side. Meanwhile, demodulator 19 and modulator 20 in the B station keep the CH-B side and the CH-A side respectively. Consequently, the order telephone signal input to order telephone signal input point 18 of the B station is output from order telephone signal output point 17 of the A station. Service from the A station to the B station is possible similarly. Further, since relay contact rla is inserted to the output side of oscillator 25, tone is not transmitted when incoming from the A station.
JP7781779A 1979-06-20 1979-06-20 Order telephone service system Pending JPS562788A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7781779A JPS562788A (en) 1979-06-20 1979-06-20 Order telephone service system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7781779A JPS562788A (en) 1979-06-20 1979-06-20 Order telephone service system

Publications (1)

Publication Number Publication Date
JPS562788A true JPS562788A (en) 1981-01-13

Family

ID=13644572

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7781779A Pending JPS562788A (en) 1979-06-20 1979-06-20 Order telephone service system

Country Status (1)

Country Link
JP (1) JPS562788A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58200145A (en) * 1982-04-05 1983-11-21 ゼネラル・エレクトリツク・カンパニイ Three-element nuclear magnetic resonance imaging method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58200145A (en) * 1982-04-05 1983-11-21 ゼネラル・エレクトリツク・カンパニイ Three-element nuclear magnetic resonance imaging method

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