JPS56144649A - Ring-off control system of multiple address communication master-station device - Google Patents

Ring-off control system of multiple address communication master-station device

Info

Publication number
JPS56144649A
JPS56144649A JP4801680A JP4801680A JPS56144649A JP S56144649 A JPS56144649 A JP S56144649A JP 4801680 A JP4801680 A JP 4801680A JP 4801680 A JP4801680 A JP 4801680A JP S56144649 A JPS56144649 A JP S56144649A
Authority
JP
Japan
Prior art keywords
ring
circuit
signal
selcal
transmitter
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
JP4801680A
Other languages
Japanese (ja)
Inventor
Masahiko Hayashi
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 Denshi KK
Original Assignee
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 Hitachi Denshi KK filed Critical Hitachi Denshi KK
Priority to JP4801680A priority Critical patent/JPS56144649A/en
Publication of JPS56144649A publication Critical patent/JPS56144649A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/59—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for emergency or urgency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R27/00—Public address systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

PURPOSE:To prevent a ring-off signal from being sounded from a speaker by placing a subordinate station in a ring-off state by intercepting a transmission output automatically for a certain time before the ring-off signal is sent to a master station, by obtaining the conditions of the ringing-off the subordinate station by ANDing the interception of a received ratio wave and the detection of the ring-off signal. CONSTITUTION:When call buttons 6-1-6-n for kinds of calls are pushed, SELCAL (selective calling system) control circuit 1 applies transmission start signal 10 to transmitter 4 and, at the same time, applies call kind signals 6'-1-6'-n, which correspond to call buttons 6-1-6-n to SELCAL generating circuit 2. This circuit 2 generates and transmits SELCAL frequency signals 7, which correspond to call kind signals 6'-1-6'-n, from transmitter 4 to an antenna to connect the speaker circuit of a selectively called subordinate station. With ring-off button 8 pushed, said control circuit 1 applies start signal 11 to timer 3 and, at the same time, intercepts the output of transmitter 4 to disconnect the speaker circuit of the subordinate station.
JP4801680A 1980-04-14 1980-04-14 Ring-off control system of multiple address communication master-station device Pending JPS56144649A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4801680A JPS56144649A (en) 1980-04-14 1980-04-14 Ring-off control system of multiple address communication master-station device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4801680A JPS56144649A (en) 1980-04-14 1980-04-14 Ring-off control system of multiple address communication master-station device

Publications (1)

Publication Number Publication Date
JPS56144649A true JPS56144649A (en) 1981-11-11

Family

ID=12791502

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4801680A Pending JPS56144649A (en) 1980-04-14 1980-04-14 Ring-off control system of multiple address communication master-station device

Country Status (1)

Country Link
JP (1) JPS56144649A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS596639A (en) * 1982-07-05 1984-01-13 Hitachi Ltd Automatic broadcasting device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS596639A (en) * 1982-07-05 1984-01-13 Hitachi Ltd Automatic broadcasting device

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