JPS5723355A - Multi-station call equipment - Google Patents

Multi-station call equipment

Info

Publication number
JPS5723355A
JPS5723355A JP9729780A JP9729780A JPS5723355A JP S5723355 A JPS5723355 A JP S5723355A JP 9729780 A JP9729780 A JP 9729780A JP 9729780 A JP9729780 A JP 9729780A JP S5723355 A JPS5723355 A JP S5723355A
Authority
JP
Japan
Prior art keywords
frequency
interphone
station
call
stations
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
JP9729780A
Other languages
Japanese (ja)
Other versions
JPS6151819B2 (en
Inventor
Hitoshi Fukagawa
Mitsuru Wada
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 Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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 Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP9729780A priority Critical patent/JPS5723355A/en
Publication of JPS5723355A publication Critical patent/JPS5723355A/en
Publication of JPS6151819B2 publication Critical patent/JPS6151819B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/02—Arrangements for interconnection not involving centralised switching involving a common line for all parties
    • H04M9/022—Multiplex systems
    • H04M9/027—Frequency division multiplex systems

Landscapes

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

Abstract

PURPOSE:To execute a call by only a pair of interphone line and control line, by controlling the call carrier frequency to idle frequency to which sequence has been given in advance, so that it can be set to a corresponding interphone station in advance. CONSTITUTION:In case a circuit shown in the figure A is that of an interphone station I3, and a call by carrier frequency f1 is being executed already between interphone stations I1, I2, a setting signal of carrier frequency f2 is outputted from a frequency setting circuit 7, a filter switching circuit 12 selects a filter for f2, and selects a switching circuit 15 so that lock frequency becomes f2. In this case, the station I2 enters into a receiving state of the frequency f2. At this time, the station I3 calls I4, switches S3, S4 are turned on by an operation displaying circuit, a channel by an interphone line li which has used the frequency f2 between the stations I3, I4 is formed, and a call is executed between both the stations I3, I4.
JP9729780A 1980-07-15 1980-07-15 Multi-station call equipment Granted JPS5723355A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9729780A JPS5723355A (en) 1980-07-15 1980-07-15 Multi-station call equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9729780A JPS5723355A (en) 1980-07-15 1980-07-15 Multi-station call equipment

Publications (2)

Publication Number Publication Date
JPS5723355A true JPS5723355A (en) 1982-02-06
JPS6151819B2 JPS6151819B2 (en) 1986-11-11

Family

ID=14188555

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9729780A Granted JPS5723355A (en) 1980-07-15 1980-07-15 Multi-station call equipment

Country Status (1)

Country Link
JP (1) JPS5723355A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02136631U (en) * 1989-04-20 1990-11-14

Also Published As

Publication number Publication date
JPS6151819B2 (en) 1986-11-11

Similar Documents

Publication Publication Date Title
JPS6460026A (en) Transmission line switching device for communication equipment
JPS56116341A (en) Radio channel switching system in communication
JPS5723355A (en) Multi-station call equipment
JPS5573137A (en) Solid state relay
JPS5530272A (en) Interphone unit
JPS53145504A (en) Cordless telephone equipment
JPS5781753A (en) Improved double-telephone device
JPS5637766A (en) Automatic telephone switching device for telemeter
JPS5720051A (en) Reception switching system of digital radio system
JPS648736A (en) Answer-back system
JPS56136073A (en) Testing method for channel continuity of telephone switching system
JPS5725768A (en) Power off circuit of telephone exchange
JPS5647157A (en) Talking device
JPS5580106A (en) Operation order change-over circuit
JPS57115094A (en) Multi-frequency signal send-out system
JPS562755A (en) Diverse terminal equipment mounted on moving material
JPS5246752A (en) Switch unit
JPS52100803A (en) Call wating system
JPS51144564A (en) Diode gate circuit
JPS51140505A (en) Selecting station operation mode automatic switching device
JPS55153486A (en) Television receiver
JPS52147903A (en) Connection switching control system for moving communicatinon method
JPS5426607A (en) Mutual connection circuit for multi-station
JPS51128201A (en) Station selecting circuit
JPS5214186A (en) Remote control circuit