JPS6166449A - 電話機装置 - Google Patents

電話機装置

Info

Publication number
JPS6166449A
JPS6166449A JP18902084A JP18902084A JPS6166449A JP S6166449 A JPS6166449 A JP S6166449A JP 18902084 A JP18902084 A JP 18902084A JP 18902084 A JP18902084 A JP 18902084A JP S6166449 A JPS6166449 A JP S6166449A
Authority
JP
Japan
Prior art keywords
telephone
buzzer
circuit
detection circuit
control
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
JP18902084A
Other languages
English (en)
Japanese (ja)
Other versions
JPH0566055B2 (
Inventor
Hideo Tanaka
英雄 田中
Hiroshi Onishi
博 大西
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 Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP18902084A priority Critical patent/JPS6166449A/ja
Publication of JPS6166449A publication Critical patent/JPS6166449A/ja
Publication of JPH0566055B2 publication Critical patent/JPH0566055B2/ja
Granted 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
    • H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
    • H04M1/663—Preventing unauthorised calls to a telephone set
    • H04M1/665—Preventing unauthorised calls to a telephone set by checking the validity of a code

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
JP18902084A 1984-09-10 1984-09-10 電話機装置 Granted JPS6166449A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18902084A JPS6166449A (ja) 1984-09-10 1984-09-10 電話機装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18902084A JPS6166449A (ja) 1984-09-10 1984-09-10 電話機装置

Publications (2)

Publication Number Publication Date
JPS6166449A true JPS6166449A (ja) 1986-04-05
JPH0566055B2 JPH0566055B2 ( ) 1993-09-21

Family

ID=16233956

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18902084A Granted JPS6166449A (ja) 1984-09-10 1984-09-10 電話機装置

Country Status (1)

Country Link
JP (1) JPS6166449A ( )

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0423131A1 (en) * 1988-07-25 1991-04-24 ANDERSON, John, James Personal signalling telephone

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5961349A (ja) * 1982-09-30 1984-04-07 Fujitsu Ltd 暗号付き電話装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5961349A (ja) * 1982-09-30 1984-04-07 Fujitsu Ltd 暗号付き電話装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0423131A1 (en) * 1988-07-25 1991-04-24 ANDERSON, John, James Personal signalling telephone
EP0423131A4 (en) * 1988-07-25 1992-05-20 John James Anderson Personal signalling telephone

Also Published As

Publication number Publication date
JPH0566055B2 ( ) 1993-09-21

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