JPS5535559A - Interphone unit - Google Patents

Interphone unit

Info

Publication number
JPS5535559A
JPS5535559A JP10899878A JP10899878A JPS5535559A JP S5535559 A JPS5535559 A JP S5535559A JP 10899878 A JP10899878 A JP 10899878A JP 10899878 A JP10899878 A JP 10899878A JP S5535559 A JPS5535559 A JP S5535559A
Authority
JP
Japan
Prior art keywords
equipment
switching
terminal
terminal equipment
windings
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.)
Granted
Application number
JP10899878A
Other languages
Japanese (ja)
Other versions
JPS5940342B2 (en
Inventor
Hiroshi Kito
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP10899878A priority Critical patent/JPS5940342B2/en
Publication of JPS5535559A publication Critical patent/JPS5535559A/en
Publication of JPS5940342B2 publication Critical patent/JPS5940342B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)

Abstract

PURPOSE:To make service possible by selecting automatically a called slave equipment to generate calling tone by controlling a matrix which is provided between the terminal equipment and the master equipment by the operation of the terminal equipment. CONSTITUTION:Switching circuits dependent upon transistors T1 to T8... whose number corresponds to the number of terminal equipments 3 to n and switching relays RYA to RYn-1 having two windings and one set of switching contacts Rs1 to Rs4... between respective terminal equipments are provided. Then, switching circuits T1 to T8 and windings are connected by diode matrixes D2 to D8..., and switching contracts Rs1 to Rs4 are connected to switch two terminal equipments. Then, switching circuits T1 to T8... and switching contacts Rs1 to Rs4... are operated by the operation of a called terminal equipment, thereby making it possible to connect the terminal equipment and master equipment 1. As a result, a called slave equipment is automatically selected to generate calling tone, and service can be performed.
JP10899878A 1978-09-04 1978-09-04 intercom device Expired JPS5940342B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10899878A JPS5940342B2 (en) 1978-09-04 1978-09-04 intercom device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10899878A JPS5940342B2 (en) 1978-09-04 1978-09-04 intercom device

Publications (2)

Publication Number Publication Date
JPS5535559A true JPS5535559A (en) 1980-03-12
JPS5940342B2 JPS5940342B2 (en) 1984-09-29

Family

ID=14498976

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10899878A Expired JPS5940342B2 (en) 1978-09-04 1978-09-04 intercom device

Country Status (1)

Country Link
JP (1) JPS5940342B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61158597A (en) * 1984-12-28 1986-07-18 日立造船株式会社 Shielding excavator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61158597A (en) * 1984-12-28 1986-07-18 日立造船株式会社 Shielding excavator

Also Published As

Publication number Publication date
JPS5940342B2 (en) 1984-09-29

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