JPS5627545A - Cordless telephone set - Google Patents

Cordless telephone set

Info

Publication number
JPS5627545A
JPS5627545A JP10336579A JP10336579A JPS5627545A JP S5627545 A JPS5627545 A JP S5627545A JP 10336579 A JP10336579 A JP 10336579A JP 10336579 A JP10336579 A JP 10336579A JP S5627545 A JPS5627545 A JP S5627545A
Authority
JP
Japan
Prior art keywords
telephone set
signal
light
amplitude
radiated
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
JP10336579A
Other languages
Japanese (ja)
Inventor
Iwamasa Nishikado
Kiichi Shimizu
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP10336579A priority Critical patent/JPS5627545A/en
Publication of JPS5627545A publication Critical patent/JPS5627545A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/725—Cordless telephones
    • H04M1/737—Characterised by transmission of electromagnetic waves other than radio waves, e.g. infrared waves

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To prevent radio interference with other telephone set by coupling telephone set circuits partially through a free space transmission line for light-amplitude- modulated signals. CONSTITUTION:A calling signal sent from telephone exchange 1 is radiated into the free space as light-amplitude-modulated signal 31 by way of detecting circuit 7 and optical signal transmitter 12. Signal 31 is received by reveiver 23 in mobile telephone set 3. As an answer is made with hook switch 24 off the hook, an answer signal is radiated from transmitter 20 as optical signal 28 and then received by receiver 15 in fixed telephone set 2. Similarly, transmitters 22 and 14 and receivers 21 and 13 are provided for transmission and reception of aural signals. Therefore, since light is used as a transmission medium, the need for countermeasures to radio interference with other telephone sets in eliminated and employing the amplitude modulation system amplifies the constitution.
JP10336579A 1979-08-13 1979-08-13 Cordless telephone set Pending JPS5627545A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10336579A JPS5627545A (en) 1979-08-13 1979-08-13 Cordless telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10336579A JPS5627545A (en) 1979-08-13 1979-08-13 Cordless telephone set

Publications (1)

Publication Number Publication Date
JPS5627545A true JPS5627545A (en) 1981-03-17

Family

ID=14352087

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10336579A Pending JPS5627545A (en) 1979-08-13 1979-08-13 Cordless telephone set

Country Status (1)

Country Link
JP (1) JPS5627545A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57188149A (en) * 1981-05-15 1982-11-19 Hitachi Ltd Operation guarantee device for optical transmission device
JPH02299330A (en) * 1989-03-20 1990-12-11 Hm Electron Inc Light wavelength communication equipment and method for utilizing the same
JP2001160647A (en) * 1999-09-24 2001-06-12 Sharp Corp Semiconductor laser device, optical transmission device, optical transmission system, electronic apparatus, control unit, connector, communication device, optical transmission method and data transmitting and receiving method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5482901A (en) * 1977-12-15 1979-07-02 Tamagawa Denki Seisakushiyo Kk Device for automatically switching telephone set

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5482901A (en) * 1977-12-15 1979-07-02 Tamagawa Denki Seisakushiyo Kk Device for automatically switching telephone set

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57188149A (en) * 1981-05-15 1982-11-19 Hitachi Ltd Operation guarantee device for optical transmission device
JPS625542B2 (en) * 1981-05-15 1987-02-05 Hitachi Ltd
JPH02299330A (en) * 1989-03-20 1990-12-11 Hm Electron Inc Light wavelength communication equipment and method for utilizing the same
JP2001160647A (en) * 1999-09-24 2001-06-12 Sharp Corp Semiconductor laser device, optical transmission device, optical transmission system, electronic apparatus, control unit, connector, communication device, optical transmission method and data transmitting and receiving method

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