JPS57197936A - Power line carrier type interphone system - Google Patents

Power line carrier type interphone system

Info

Publication number
JPS57197936A
JPS57197936A JP8293881A JP8293881A JPS57197936A JP S57197936 A JPS57197936 A JP S57197936A JP 8293881 A JP8293881 A JP 8293881A JP 8293881 A JP8293881 A JP 8293881A JP S57197936 A JPS57197936 A JP S57197936A
Authority
JP
Japan
Prior art keywords
speech
calling
channel
power line
subordinate
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
JP8293881A
Other languages
Japanese (ja)
Inventor
Hideo Togawa
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 JP8293881A priority Critical patent/JPS57197936A/en
Publication of JPS57197936A publication Critical patent/JPS57197936A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/544—Setting up communications; Call and signalling arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/545—Audio/video application, e.g. interphone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5462—Systems for power line communications
    • H04B2203/5491—Systems for power line communications using filtering and bypassing

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To obtain a power line carrier type interphone by realize multiple- station constitution by using only two kind of carrier frequencies for speech and calling, and enabling a block filter having a narrow frequency band to be used. CONSTITUTION:The channel of a subordinate station is selected from the transmitter 4 of a master station 3 and a calling data signal is transmitted. Then, a subordinate equipment 2 receives it by a receiving circuit part 4 and an arithmetic processing circuit 5 collates the input with data preset in a channel setting part 6; only when the both coincide with each other, the relay Ry operates to make the contact (r), and a speech circuit part (interphone 1) is connected to power lines l1 and l2 to enable speech. At this time, receivers of other subordinate stations are not in operation and speech and wiretapping are impossible. Namely, one-channel centralized calling to many stations is performed through a channel and a block filter BF provided for the leakage of signals from the power line to the outside of the house requires only a narrow band for storpping two kinds of carrier frequency bands for speech and calling control.
JP8293881A 1981-05-30 1981-05-30 Power line carrier type interphone system Pending JPS57197936A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8293881A JPS57197936A (en) 1981-05-30 1981-05-30 Power line carrier type interphone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8293881A JPS57197936A (en) 1981-05-30 1981-05-30 Power line carrier type interphone system

Publications (1)

Publication Number Publication Date
JPS57197936A true JPS57197936A (en) 1982-12-04

Family

ID=13788157

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8293881A Pending JPS57197936A (en) 1981-05-30 1981-05-30 Power line carrier type interphone system

Country Status (1)

Country Link
JP (1) JPS57197936A (en)

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