FR2431809B1 - - Google Patents

Info

Publication number
FR2431809B1
FR2431809B1 FR7821888A FR7821888A FR2431809B1 FR 2431809 B1 FR2431809 B1 FR 2431809B1 FR 7821888 A FR7821888 A FR 7821888A FR 7821888 A FR7821888 A FR 7821888A FR 2431809 B1 FR2431809 B1 FR 2431809B1
Authority
FR
France
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.)
Expired
Application number
FR7821888A
Other languages
French (fr)
Other versions
FR2431809A1 (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.)
Telediffusion de France ets Public de Diffusion
Original Assignee
Telediffusion de France ets Public de Diffusion
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 Telediffusion de France ets Public de Diffusion filed Critical Telediffusion de France ets Public de Diffusion
Priority to FR7821888A priority Critical patent/FR2431809A1/en
Publication of FR2431809A1 publication Critical patent/FR2431809A1/en
Application granted granted Critical
Publication of FR2431809B1 publication Critical patent/FR2431809B1/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
    • H04N7/169—Systems operating in the time domain of the television signal
    • H04N7/1696—Systems operating in the time domain of the television signal by changing or reversing the order of active picture signal portions
FR7821888A 1978-07-20 1978-07-20 TV receiver signals scrambler - divides video signal line into samples and cyclically interchanges time position of samples Granted FR2431809A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7821888A FR2431809A1 (en) 1978-07-20 1978-07-20 TV receiver signals scrambler - divides video signal line into samples and cyclically interchanges time position of samples

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7821888A FR2431809A1 (en) 1978-07-20 1978-07-20 TV receiver signals scrambler - divides video signal line into samples and cyclically interchanges time position of samples

Publications (2)

Publication Number Publication Date
FR2431809A1 FR2431809A1 (en) 1980-02-15
FR2431809B1 true FR2431809B1 (en) 1983-01-07

Family

ID=9211101

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7821888A Granted FR2431809A1 (en) 1978-07-20 1978-07-20 TV receiver signals scrambler - divides video signal line into samples and cyclically interchanges time position of samples

Country Status (1)

Country Link
FR (1) FR2431809A1 (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4318125A (en) * 1979-04-25 1982-03-02 Westinghouse Electric Corp. Solid state digital audio scrambler system for teletransmission of audio intelligence through a television system
US4266243A (en) * 1979-04-25 1981-05-05 Westinghouse Electric Corp. Scrambling system for television sound signals
JPS59500694A (en) * 1982-04-23 1984-04-19 インデペンデント・ブロ−ドキヤステイング・オ−ソリテイ Signal coding equipment for reliable signal transmission
FR2533099A1 (en) * 1982-09-14 1984-03-16 Radiotechnique METHOD FOR INTERRUPTING TELEVISION IMAGES AND DEVICE FOR DECHIFING IMAGES SO BROWNED
EP0338594B1 (en) * 1982-09-14 1994-04-13 Philips Electronique Grand Public Television signal descrambling device
DE3371947D1 (en) * 1982-12-20 1987-07-09 Radiotechnique Sa Generator of random number sequences
FR2551235B1 (en) * 1983-08-22 1985-10-25 Radiotechnique PSEUDOALEATORY DIGITAL SEQUENCE GENERATOR
FR2539938A1 (en) * 1983-01-25 1984-07-27 Thomson Brandt Method of protecting the video signal of a television transmission, in particular a pay transmission, and device implementing such a method
FR2541841A1 (en) * 1983-02-25 1984-08-31 Radiotechnique DEVICE FOR DE-RECORDING TELEVISION IMAGES BROUGHT BY APPLICATION TO VIDEO SIGNALS OF CIRCULAR PERMUTATIONS
FR2607341A1 (en) * 1983-03-21 1988-05-27 Telediffusion Fse Scrambling and descrambling method for television pictures
FR2543386B1 (en) * 1983-03-21 1987-03-20 Telediffusion Fse METHODS AND DEVICES FOR SCRAMBLING AND SCRAMBLING FOR TELEVISION IMAGES
WO1984004013A1 (en) * 1983-03-28 1984-10-11 Indep Broadcasting Authority Encryption of television signals
GB2141905A (en) * 1983-06-20 1985-01-03 Philips Electronic Associated Secure transmission system
EP0129299A3 (en) * 1983-06-20 1986-03-19 Philips Electronics Uk Limited Secure television transmission system
US4723282A (en) * 1985-01-08 1988-02-02 U.S. Philips Corporation Method and apparatus of decoding and deciphering a rotated video signal
US4736420A (en) * 1986-09-19 1988-04-05 M/A-Com Government Systems, Inc. Video scrambling by segmenting video information lines

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE24926E (en) * 1954-03-10 1961-01-17 Subscription color television system
CA1097794A (en) * 1975-08-08 1981-03-17 Harold B. Shutterly Secure television transmission system

Also Published As

Publication number Publication date
FR2431809A1 (en) 1980-02-15

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Legal Events

Date Code Title Description
TP Transmission of property