JPS6342893B2 - - Google Patents

Info

Publication number
JPS6342893B2
JPS6342893B2 JP54071161A JP7116179A JPS6342893B2 JP S6342893 B2 JPS6342893 B2 JP S6342893B2 JP 54071161 A JP54071161 A JP 54071161A JP 7116179 A JP7116179 A JP 7116179A JP S6342893 B2 JPS6342893 B2 JP S6342893B2
Authority
JP
Japan
Prior art keywords
communication
signal
wave
area
frequency
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.)
Expired
Application number
JP54071161A
Other languages
English (en)
Japanese (ja)
Other versions
JPS55163922A (en
Inventor
Yutaka Umetsu
Takeshi Takeuchi
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.)
Hochiki Corp
Original Assignee
Hochiki Corp
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 Hochiki Corp filed Critical Hochiki Corp
Priority to JP7116179A priority Critical patent/JPS55163922A/ja
Priority to US06/156,491 priority patent/US4378602A/en
Publication of JPS55163922A publication Critical patent/JPS55163922A/ja
Publication of JPS6342893B2 publication Critical patent/JPS6342893B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F9/00—Magnetic amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)
  • Near-Field Transmission Systems (AREA)
JP7116179A 1979-06-08 1979-06-08 Communication unit with limited communication area Granted JPS55163922A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP7116179A JPS55163922A (en) 1979-06-08 1979-06-08 Communication unit with limited communication area
US06/156,491 US4378602A (en) 1979-06-08 1980-06-04 Communication system with a limited communication area

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7116179A JPS55163922A (en) 1979-06-08 1979-06-08 Communication unit with limited communication area

Publications (2)

Publication Number Publication Date
JPS55163922A JPS55163922A (en) 1980-12-20
JPS6342893B2 true JPS6342893B2 (enExample) 1988-08-26

Family

ID=13452628

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7116179A Granted JPS55163922A (en) 1979-06-08 1979-06-08 Communication unit with limited communication area

Country Status (2)

Country Link
US (1) US4378602A (enExample)
JP (1) JPS55163922A (enExample)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57132760A (en) * 1981-02-10 1982-08-17 Toshiba Corp Gate pulse generator for high voltage thyristor converter
JPS61168736U (enExample) * 1985-04-08 1986-10-20
US4901348A (en) * 1985-12-24 1990-02-13 American Telephone And Telegraph Company Data transmission security arrangement for a plurality of data stations sharing access to a communication network
JPS6397932U (enExample) * 1986-12-15 1988-06-24
AU607022B2 (en) * 1987-12-01 1991-02-21 Ascom Tateco Ab Paging system with paging receivers controlled depending on location
US5826178A (en) * 1996-01-29 1998-10-20 Seiko Communications Systems, Inc. Loop antenna with reduced electrical field sensitivity

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2567431A (en) * 1947-05-05 1951-09-11 William S Halstead Communications system of restricted-range type
US3996518A (en) * 1974-10-31 1976-12-07 Carrier Communication, Inc. Inductive carrier communication systems

Also Published As

Publication number Publication date
JPS55163922A (en) 1980-12-20
US4378602A (en) 1983-03-29

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