JPS5414104A - Privacy circuit for telephone - Google Patents

Privacy circuit for telephone

Info

Publication number
JPS5414104A
JPS5414104A JP7955077A JP7955077A JPS5414104A JP S5414104 A JPS5414104 A JP S5414104A JP 7955077 A JP7955077 A JP 7955077A JP 7955077 A JP7955077 A JP 7955077A JP S5414104 A JPS5414104 A JP S5414104A
Authority
JP
Japan
Prior art keywords
telephone
privacy circuit
privacy
circuit
paralleley
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
JP7955077A
Other languages
Japanese (ja)
Inventor
Shiokazu Fujiwara
Yuichiro Takagawa
Yoshio Nagasaki
Minoru Sasai
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
Kanda Tsushin Kogyo Co Ltd
Original Assignee
Nippon Telegraph and Telephone Corp
Kanda Tsushin Kogyo 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 Nippon Telegraph and Telephone Corp, Kanda Tsushin Kogyo Co Ltd filed Critical Nippon Telegraph and Telephone Corp
Priority to JP7955077A priority Critical patent/JPS5414104A/en
Publication of JPS5414104A publication Critical patent/JPS5414104A/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
    • H04M1/68—Circuit arrangements for preventing eavesdropping
    • H04M1/70—Lock-out or secrecy arrangements in party-line systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To improve the privacy performance for a plurality of telephone sets connected paralleley, by inserting non-linear elements and capacitors of small capacitance to the telephone line.
JP7955077A 1977-07-05 1977-07-05 Privacy circuit for telephone Pending JPS5414104A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7955077A JPS5414104A (en) 1977-07-05 1977-07-05 Privacy circuit for telephone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7955077A JPS5414104A (en) 1977-07-05 1977-07-05 Privacy circuit for telephone

Publications (1)

Publication Number Publication Date
JPS5414104A true JPS5414104A (en) 1979-02-02

Family

ID=13693106

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7955077A Pending JPS5414104A (en) 1977-07-05 1977-07-05 Privacy circuit for telephone

Country Status (1)

Country Link
JP (1) JPS5414104A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4332983A (en) * 1980-10-27 1982-06-01 Hosein Vakili Telephone privacy controller

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5081604A (en) * 1973-11-21 1975-07-02

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5081604A (en) * 1973-11-21 1975-07-02

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4332983A (en) * 1980-10-27 1982-06-01 Hosein Vakili Telephone privacy controller

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