JPS54144109A - Carrier type interphone - Google Patents

Carrier type interphone

Info

Publication number
JPS54144109A
JPS54144109A JP5301678A JP5301678A JPS54144109A JP S54144109 A JPS54144109 A JP S54144109A JP 5301678 A JP5301678 A JP 5301678A JP 5301678 A JP5301678 A JP 5301678A JP S54144109 A JPS54144109 A JP S54144109A
Authority
JP
Japan
Prior art keywords
out signal
call out
signal
carrier
code
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
JP5301678A
Other languages
Japanese (ja)
Other versions
JPS5857012B2 (en
Inventor
Kensaburo Tanemura
Takeyoshi Kawamura
Yoshiharu Suzuki
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 JP53053016A priority Critical patent/JPS5857012B2/en
Publication of JPS54144109A publication Critical patent/JPS54144109A/en
Publication of JPS5857012B2 publication Critical patent/JPS5857012B2/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
    • 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)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)

Abstract

PURPOSE:To assure sufficient channel, by taking the carrier feeding audio signal and that feeding the call out signal consisting of pulse code different in frequency, and transmitting them through the change of the code of call out signal. CONSTITUTION:In the master unit A, the call out signal generating section 1 generates the call out signal consisting of pulse code, the signal generated from the carrier measns 2 is carried to the transmission line, to carry the audio signal with the different frequency from the carrier frequency of the call out signal with the transmitter 3. On the other hand, in a plurality of slave units B, the out signal transmitted is selectively received and displayed with reception display unit 4, and the receiver 5 demodulates the audio signal after reception. Accordingly, sufficient channel can be assured by transmission through the change of the code of call out signal.
JP53053016A 1978-05-02 1978-05-02 Transportable intercom Expired JPS5857012B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53053016A JPS5857012B2 (en) 1978-05-02 1978-05-02 Transportable intercom

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53053016A JPS5857012B2 (en) 1978-05-02 1978-05-02 Transportable intercom

Publications (2)

Publication Number Publication Date
JPS54144109A true JPS54144109A (en) 1979-11-10
JPS5857012B2 JPS5857012B2 (en) 1983-12-17

Family

ID=12931096

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53053016A Expired JPS5857012B2 (en) 1978-05-02 1978-05-02 Transportable intercom

Country Status (1)

Country Link
JP (1) JPS5857012B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6051335A (en) * 1983-08-31 1985-03-22 Matsushita Electric Works Ltd Multichannel interphone system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6051335A (en) * 1983-08-31 1985-03-22 Matsushita Electric Works Ltd Multichannel interphone system

Also Published As

Publication number Publication date
JPS5857012B2 (en) 1983-12-17

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