FR2362537A1 - Radio communication equipment with frequency switching - has addressable memory for selection of successive transmission frequencies - Google Patents

Radio communication equipment with frequency switching - has addressable memory for selection of successive transmission frequencies

Info

Publication number
FR2362537A1
FR2362537A1 FR7625033A FR7625033A FR2362537A1 FR 2362537 A1 FR2362537 A1 FR 2362537A1 FR 7625033 A FR7625033 A FR 7625033A FR 7625033 A FR7625033 A FR 7625033A FR 2362537 A1 FR2362537 A1 FR 2362537A1
Authority
FR
France
Prior art keywords
frequency
radio communication
communication equipment
addressable memory
selection
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
FR7625033A
Other languages
French (fr)
Other versions
FR2362537B1 (en
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.)
Socrat
Original Assignee
Socrat
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 Socrat filed Critical Socrat
Priority to FR7625033A priority Critical patent/FR2362537A1/en
Publication of FR2362537A1 publication Critical patent/FR2362537A1/en
Priority to FR7823067A priority patent/FR2432803A2/en
Application granted granted Critical
Publication of FR2362537B1 publication Critical patent/FR2362537B1/fr
Granted 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)
  • Transceivers (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The radio communication equipment has frequency channel switching to enable transmission of personal or secretinformation. The frequency switching is automatically obtained without disruption of transmission. The equipment comprises two receiving and transmitting stations. Each station has a frequency generator which controls the transmitting frequency. The frequency is selected in value and in time duration by two signals. The signals are provided by an addressable memory which controls the frequency generator and also controls a timer. It also has a synchronous circuit to ensure synchronism of transmission.
FR7625033A 1976-08-18 1976-08-18 Radio communication equipment with frequency switching - has addressable memory for selection of successive transmission frequencies Granted FR2362537A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR7625033A FR2362537A1 (en) 1976-08-18 1976-08-18 Radio communication equipment with frequency switching - has addressable memory for selection of successive transmission frequencies
FR7823067A FR2432803A2 (en) 1976-08-18 1978-08-04 Secrecy transmission system with frequency synthesiser - switches signal between number of available channels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7625033A FR2362537A1 (en) 1976-08-18 1976-08-18 Radio communication equipment with frequency switching - has addressable memory for selection of successive transmission frequencies

Publications (2)

Publication Number Publication Date
FR2362537A1 true FR2362537A1 (en) 1978-03-17
FR2362537B1 FR2362537B1 (en) 1980-10-24

Family

ID=9176951

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7625033A Granted FR2362537A1 (en) 1976-08-18 1976-08-18 Radio communication equipment with frequency switching - has addressable memory for selection of successive transmission frequencies

Country Status (1)

Country Link
FR (1) FR2362537A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2432803A2 (en) * 1976-08-18 1980-02-29 Socrat Secrecy transmission system with frequency synthesiser - switches signal between number of available channels
EP0074657A1 (en) * 1981-09-15 1983-03-23 Siemens Aktiengesellschaft Method of securing the transmission of digital signals

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2432803A2 (en) * 1976-08-18 1980-02-29 Socrat Secrecy transmission system with frequency synthesiser - switches signal between number of available channels
EP0074657A1 (en) * 1981-09-15 1983-03-23 Siemens Aktiengesellschaft Method of securing the transmission of digital signals

Also Published As

Publication number Publication date
FR2362537B1 (en) 1980-10-24

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Legal Events

Date Code Title Description
ST Notification of lapse