FR2405601A1 - RADIOELECTRIC SYSTEM FOR TRANSMISSION OF INFORMATION BY MODULATION OF A VARIABLE FREQUENCY CARRIER BY JUMPING - Google Patents

RADIOELECTRIC SYSTEM FOR TRANSMISSION OF INFORMATION BY MODULATION OF A VARIABLE FREQUENCY CARRIER BY JUMPING

Info

Publication number
FR2405601A1
FR2405601A1 FR7538853A FR7538853A FR2405601A1 FR 2405601 A1 FR2405601 A1 FR 2405601A1 FR 7538853 A FR7538853 A FR 7538853A FR 7538853 A FR7538853 A FR 7538853A FR 2405601 A1 FR2405601 A1 FR 2405601A1
Authority
FR
France
Prior art keywords
modulation
frequency
jumping
transmission
information
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Withdrawn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
FR7538853A
Other languages
French (fr)
Inventor
Elie Brunet
Laurent Augier De Cremiers
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.)
Telecommunications Radioelectriques et Telephoniques SA TRT
Original Assignee
Telecommunications Radioelectriques et Telephoniques SA TRT
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 Telecommunications Radioelectriques et Telephoniques SA TRT filed Critical Telecommunications Radioelectriques et Telephoniques SA TRT
Priority to FR7538853A priority Critical patent/FR2405601A1/en
Priority to GB4817676A priority patent/GB1572454A/en
Priority to NL7613800A priority patent/NL7613800A/en
Priority to DE19762657283 priority patent/DE2657283A1/en
Publication of FR2405601A1 publication Critical patent/FR2405601A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • 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)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Small-Scale Networks (AREA)

Abstract

Système radioélectrique de transmission d'informations par modulation d'une porteuse à fréquence variant par sauts, l'émetteur et le récepteur comportant chacun un étage changeur de fréquences commandé par un synthétiseur de fréquences variant par sauts suivant un rythme déterminé par un générateur d'horloge et suivant un code se reproduisant périodiquement. Pour obtenir la synchronisation des deux synthétiseurs, le récepteur comporte un circuit limiteur avant le démodulateur, des moyens pour fournir un signal de valeur moyenne du niveau de bruit à la sortie du circuit limiteur, ce signal de valeur moyenne étant utilisé pour commander la fréquence du générateur d'horloge du récepteur. Application : systèmes de communications.Radioelectric system for transmitting information by modulation of a carrier at a frequency varying by hops, the transmitter and the receiver each comprising a frequency changer stage controlled by a frequency synthesizer varying by hops according to a rhythm determined by a generator. clock and following a code that recurs periodically. To obtain the synchronization of the two synthesizers, the receiver comprises a limiter circuit before the demodulator, means for supplying an average value signal of the noise level at the output of the limiter circuit, this average value signal being used to control the frequency of the noise level. receiver clock generator. Application: communications systems.

FR7538853A 1975-12-18 1975-12-18 RADIOELECTRIC SYSTEM FOR TRANSMISSION OF INFORMATION BY MODULATION OF A VARIABLE FREQUENCY CARRIER BY JUMPING Withdrawn FR2405601A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR7538853A FR2405601A1 (en) 1975-12-18 1975-12-18 RADIOELECTRIC SYSTEM FOR TRANSMISSION OF INFORMATION BY MODULATION OF A VARIABLE FREQUENCY CARRIER BY JUMPING
GB4817676A GB1572454A (en) 1975-12-18 1976-11-18 Radio-electric system
NL7613800A NL7613800A (en) 1975-12-18 1976-12-10 INFORMATION TRANSMISSION SYSTEM.
DE19762657283 DE2657283A1 (en) 1975-12-18 1976-12-17 WIRELESS INFORMATION TRANSFER SYSTEM

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7538853A FR2405601A1 (en) 1975-12-18 1975-12-18 RADIOELECTRIC SYSTEM FOR TRANSMISSION OF INFORMATION BY MODULATION OF A VARIABLE FREQUENCY CARRIER BY JUMPING

Publications (1)

Publication Number Publication Date
FR2405601A1 true FR2405601A1 (en) 1979-05-04

Family

ID=9163912

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7538853A Withdrawn FR2405601A1 (en) 1975-12-18 1975-12-18 RADIOELECTRIC SYSTEM FOR TRANSMISSION OF INFORMATION BY MODULATION OF A VARIABLE FREQUENCY CARRIER BY JUMPING

Country Status (4)

Country Link
DE (1) DE2657283A1 (en)
FR (1) FR2405601A1 (en)
GB (1) GB1572454A (en)
NL (1) NL7613800A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0068690A1 (en) * 1981-06-22 1983-01-05 The Marconi Company Limited Radio communications receivers
FR2538645A1 (en) * 1982-12-28 1984-06-29 Thomson Csf METHOD AND DEVICE FOR INTERPOLATING SPEECH IN A DIGITAL SPEECH TRANSMISSION SYSTEM

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4435821A (en) * 1981-03-24 1984-03-06 Nippon Electric Co., Ltd. Receiver in a frequency hopping communication system
GB2100944B (en) * 1981-06-24 1985-03-06 Racal Res Ltd Synchronisation circuits
GB2276794A (en) * 1993-03-25 1994-10-05 Roke Manor Research Spread spectrum analog signal communication system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3706933A (en) * 1963-09-17 1972-12-19 Sylvania Electric Prod Synchronizing systems in the presence of noise
US3824468A (en) * 1966-09-14 1974-07-16 Philips Corp System for transmitting information in the prescribed frequency-band

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3706933A (en) * 1963-09-17 1972-12-19 Sylvania Electric Prod Synchronizing systems in the presence of noise
US3824468A (en) * 1966-09-14 1974-07-16 Philips Corp System for transmitting information in the prescribed frequency-band

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0068690A1 (en) * 1981-06-22 1983-01-05 The Marconi Company Limited Radio communications receivers
FR2538645A1 (en) * 1982-12-28 1984-06-29 Thomson Csf METHOD AND DEVICE FOR INTERPOLATING SPEECH IN A DIGITAL SPEECH TRANSMISSION SYSTEM
EP0113291A2 (en) * 1982-12-28 1984-07-11 Thomson-Csf Speech interpolation method and apparatus in a digitized speech transmission system
EP0113291A3 (en) * 1982-12-28 1984-08-08 Thomson-Csf Speech interpolation method and apparatus in a digitized speech transmission system

Also Published As

Publication number Publication date
GB1572454A (en) 1980-07-30
DE2657283A1 (en) 1979-08-16
NL7613800A (en) 1979-03-30

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Legal Events

Date Code Title Description
ST Notification of lapse