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 JUMPINGInfo
- 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- Withdrawn
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.
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)
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)
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)
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 |
-
1975
- 1975-12-18 FR FR7538853A patent/FR2405601A1/en not_active Withdrawn
-
1976
- 1976-11-18 GB GB4817676A patent/GB1572454A/en not_active Expired
- 1976-12-10 NL NL7613800A patent/NL7613800A/en not_active Application Discontinuation
- 1976-12-17 DE DE19762657283 patent/DE2657283A1/en active Pending
Patent Citations (2)
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)
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 |
---|---|
DE2657283A1 (en) | 1979-08-16 |
GB1572454A (en) | 1980-07-30 |
NL7613800A (en) | 1979-03-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |