JPS5357903A - Privacy communication set - Google Patents

Privacy communication set

Info

Publication number
JPS5357903A
JPS5357903A JP13288476A JP13288476A JPS5357903A JP S5357903 A JPS5357903 A JP S5357903A JP 13288476 A JP13288476 A JP 13288476A JP 13288476 A JP13288476 A JP 13288476A JP S5357903 A JPS5357903 A JP S5357903A
Authority
JP
Japan
Prior art keywords
communication set
privacy communication
privacy
plarity
superimposing
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
JP13288476A
Other languages
Japanese (ja)
Inventor
Shigeru Asakawa
Fumio Sugiyama
Makoto Nakamura
Tsukasa Okai
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP13288476A priority Critical patent/JPS5357903A/en
Priority to US05/837,768 priority patent/US4159399A/en
Publication of JPS5357903A publication Critical patent/JPS5357903A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/02—Secret communication by adding a second signal to make the desired signal unintelligible

Abstract

PURPOSE:To prevent interception of the content of communication, by superimposing stationary signal after polarity-inverting the original signal according to a given rule and transmitting again with plarity inversion.
JP13288476A 1976-09-29 1976-11-05 Privacy communication set Pending JPS5357903A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP13288476A JPS5357903A (en) 1976-11-05 1976-11-05 Privacy communication set
US05/837,768 US4159399A (en) 1976-09-29 1977-09-29 Security communication system using polarity inversion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13288476A JPS5357903A (en) 1976-11-05 1976-11-05 Privacy communication set

Publications (1)

Publication Number Publication Date
JPS5357903A true JPS5357903A (en) 1978-05-25

Family

ID=15091799

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13288476A Pending JPS5357903A (en) 1976-09-29 1976-11-05 Privacy communication set

Country Status (1)

Country Link
JP (1) JPS5357903A (en)

Similar Documents

Publication Publication Date Title
JPS5357903A (en) Privacy communication set
JPS5313806A (en) Telephone extension system
JPS5318304A (en) Privacy communication unit
JPS53121501A (en) Loop transmission system
JPS5373019A (en) Signal detection system
JPS5318306A (en) Privacy communication unit
JPS52104001A (en) Secret communication system
JPS52137222A (en) Interface system
JPS5344788A (en) Transmitter/receiver
JPS51113506A (en) Synchronizing equipment for digital code transmission
JPS5276809A (en) Transmitter for data
JPS5327312A (en) Signal transmission system
JPS533115A (en) Pcm terminal station unit
JPS5424505A (en) Modem control unit of semi-double type
JPS5228808A (en) Transmitting and receiving system of interphone
JPS52126103A (en) Communication method
JPS5357909A (en) Signal transmission system
JPS5293206A (en) Data transmission system
JPS5274201A (en) Display control circuit for key telephone system
JPS5242303A (en) Key restoring set for telephone
JPS5213707A (en) Privacy system in key telephone system
JPS523310A (en) Remote scanning system
JPS51144196A (en) Ecm system
JPS52149409A (en) Digital data exchanging network
JPS5260507A (en) Receiver