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FR2416597A1 - Signal coding system for secret transmission - uses transposition of signal frequency with applied pseudo-random bias using locally generated analog signal - Google Patents

Signal coding system for secret transmission - uses transposition of signal frequency with applied pseudo-random bias using locally generated analog signal

Info

Publication number
FR2416597A1
FR2416597A1 FR7144215A FR7144215A FR2416597A1 FR 2416597 A1 FR2416597 A1 FR 2416597A1 FR 7144215 A FR7144215 A FR 7144215A FR 7144215 A FR7144215 A FR 7144215A FR 2416597 A1 FR2416597 A1 FR 2416597A1
Authority
FR
France
Prior art keywords
signal
frequency
coding system
locally generated
transposition
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.)
Withdrawn
Application number
FR7144215A
Other languages
French (fr)
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.)
BERGER CLAUDE
Original Assignee
BERGER CLAUDE
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 BERGER CLAUDE filed Critical BERGER CLAUDE
Priority to FR7144215A priority Critical patent/FR2416597A1/en
Priority to BE127466A priority patent/BE795216A/xx
Publication of FR2416597A1 publication Critical patent/FR2416597A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/003—Secret communication by varying carrier frequency at or within predetermined or random intervals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

The signal coding and decoding system ensures secrecy of an audio message during transmission. At the transmitter a reference frequency is used to effect a frequency transposition of the signal spectrum. A constant bias of a pseudorandom nature is applied to this for a specified long period, using a locally genrated analogue signal. At the receiver a reference frequency is generated equal to and synchronised with that used at the emitter, using a locally produced analogue signal. This reference signal is used for the inverse frequency transposition of the received signal. The appropriate analogue signal may be derived from a dephased loop controlled by a local clock.
FR7144215A 1971-12-09 1971-12-09 Signal coding system for secret transmission - uses transposition of signal frequency with applied pseudo-random bias using locally generated analog signal Withdrawn FR2416597A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR7144215A FR2416597A1 (en) 1971-12-09 1971-12-09 Signal coding system for secret transmission - uses transposition of signal frequency with applied pseudo-random bias using locally generated analog signal
BE127466A BE795216A (en) 1971-12-09 1973-02-09

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7144215A FR2416597A1 (en) 1971-12-09 1971-12-09 Signal coding system for secret transmission - uses transposition of signal frequency with applied pseudo-random bias using locally generated analog signal

Publications (1)

Publication Number Publication Date
FR2416597A1 true FR2416597A1 (en) 1979-08-31

Family

ID=9087197

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7144215A Withdrawn FR2416597A1 (en) 1971-12-09 1971-12-09 Signal coding system for secret transmission - uses transposition of signal frequency with applied pseudo-random bias using locally generated analog signal

Country Status (2)

Country Link
BE (1) BE795216A (en)
FR (1) FR2416597A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0328836A2 (en) * 1987-10-27 1989-08-23 Cedcom Network Systems Pty. Limited Pseudo-passive universal communicator system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1301404A (en) * 1961-07-06 1962-08-17 Prec Mecanique Labinal Hertzian link device, in particular for a remote control
CH460870A (en) * 1966-09-14 1968-08-15 Philips Nv Transmission system with a transmitting device and a receiving device for transmitting information in a specific frequency band
FR1536799A (en) * 1966-09-14 1968-08-16 Philips Nv System for the transmission of information in a prescribed frequency band
FR2152161A5 (en) * 1971-09-07 1973-04-20 Boeing Co

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1301404A (en) * 1961-07-06 1962-08-17 Prec Mecanique Labinal Hertzian link device, in particular for a remote control
CH460870A (en) * 1966-09-14 1968-08-15 Philips Nv Transmission system with a transmitting device and a receiving device for transmitting information in a specific frequency band
FR1536799A (en) * 1966-09-14 1968-08-16 Philips Nv System for the transmission of information in a prescribed frequency band
FR2152161A5 (en) * 1971-09-07 1973-04-20 Boeing Co

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0328836A2 (en) * 1987-10-27 1989-08-23 Cedcom Network Systems Pty. Limited Pseudo-passive universal communicator system
EP0328836A3 (en) * 1987-10-27 1991-08-14 Cedcom Network Systems Pty. Limited Pseudo-passive universal communicator system

Also Published As

Publication number Publication date
BE795216A (en) 1973-08-09

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Legal Events

Date Code Title Description
ST Notification of lapse