FR2368837A1 - PROCEDURE FOR TRANSMITTING INFORMATION - Google Patents

PROCEDURE FOR TRANSMITTING INFORMATION

Info

Publication number
FR2368837A1
FR2368837A1 FR7207453A FR7207453A FR2368837A1 FR 2368837 A1 FR2368837 A1 FR 2368837A1 FR 7207453 A FR7207453 A FR 7207453A FR 7207453 A FR7207453 A FR 7207453A FR 2368837 A1 FR2368837 A1 FR 2368837A1
Authority
FR
France
Prior art keywords
signal
transmitting information
procedure
image
pseudo
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
FR7207453A
Other languages
French (fr)
Other versions
FR2368837B1 (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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of FR2368837A1 publication Critical patent/FR2368837A1/en
Application granted granted Critical
Publication of FR2368837B1 publication Critical patent/FR2368837B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Closed-Circuit Television Systems (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Television Systems (AREA)

Abstract

L'invention concerne un procédé pour transmettre des informations. Selon ce procédé, le signal sous forme d'image à transmettre est transmis sous la forme d'un signal module angulairement, puis modulé en phase avec des signaux pseudo-aléatoires, tandis que, du côté réception, le signal est restitué et rétabli par filtrage du signal pseudo-aléatoire et démodulation angulaire et est appliqué comme signal de modulation à un appareil de restitution d'image. L'invention est applicable notamment à la transmission d'informations sous forme d'image entre deux engins spéciaux.The invention relates to a method for transmitting information. According to this method, the image signal to be transmitted is transmitted in the form of an angularly modulated signal, then phase modulated with pseudo-random signals, while, on the reception side, the signal is restored and restored by filtering of the pseudo-random signal and angular demodulation and is applied as a modulation signal to an image reproduction apparatus. The invention is particularly applicable to the transmission of information in image form between two special devices.

FR7207453A 1971-03-05 1972-03-03 PROCEDURE FOR TRANSMITTING INFORMATION Granted FR2368837A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712110468 DE2110468C1 (en) 1971-03-05 1971-03-05 Procedure for the transfer of information

Publications (2)

Publication Number Publication Date
FR2368837A1 true FR2368837A1 (en) 1978-05-19
FR2368837B1 FR2368837B1 (en) 1982-04-30

Family

ID=5800567

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7207453A Granted FR2368837A1 (en) 1971-03-05 1972-03-03 PROCEDURE FOR TRANSMITTING INFORMATION

Country Status (5)

Country Link
DE (1) DE2110468C1 (en)
FR (1) FR2368837A1 (en)
GB (1) GB1506559A (en)
IT (1) IT1019524B (en)
NL (1) NL159257B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2509559A1 (en) * 1981-07-10 1983-01-14 Thomson Csf Digital DPSK TV signal secrecy transmission method - uses pseudo random changes in carrier frequency, frequency agile pass-band filtering and line synchronisation decoder

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2581197B1 (en) * 1982-08-11 1987-09-04 Dassault Electronique METHOD AND DEVICE FOR ELIMINATING THE EFFECT OF INTERFERENCE SIGNALS RELATED TO SWITCHING RECEPTION CHANNELS IN A PULSE RADAR.
FR2706704B1 (en) * 1993-06-09 1995-07-13 Alcatel Telspace Spread spectrum digital transmission system obtained by low frequency pseudo-random coding of useful information and spread spectrum compression method used in such a system.
GB2288300A (en) * 1994-04-05 1995-10-11 Christopher Robert Turner Video surveillance system using spread spectrum radio communication
GB2308949B (en) * 1996-01-08 1999-11-10 Ramar Technology Ltd Remote meter reading system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2777897A (en) * 1950-04-22 1957-01-15 Gretener Secrecy communication system
US3180927A (en) * 1961-09-07 1965-04-27 Itt Cryptosecure transmission system
FR1444250A (en) * 1965-05-21 1966-07-01 Csf Link synchronization device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2777897A (en) * 1950-04-22 1957-01-15 Gretener Secrecy communication system
US3180927A (en) * 1961-09-07 1965-04-27 Itt Cryptosecure transmission system
FR1444250A (en) * 1965-05-21 1966-07-01 Csf Link synchronization device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2509559A1 (en) * 1981-07-10 1983-01-14 Thomson Csf Digital DPSK TV signal secrecy transmission method - uses pseudo random changes in carrier frequency, frequency agile pass-band filtering and line synchronisation decoder

Also Published As

Publication number Publication date
FR2368837B1 (en) 1982-04-30
NL159257B (en) 1979-01-15
GB1506559A (en) 1978-04-05
DE2110468C1 (en) 1978-04-27
IT1019524B (en) 1977-11-30
NL7201298A (en) 1978-01-31

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Legal Events

Date Code Title Description
ST Notification of lapse