BE889509A - Systeme de television par cables - Google Patents

Systeme de television par cables

Info

Publication number
BE889509A
BE889509A BE0/205315A BE205315A BE889509A BE 889509 A BE889509 A BE 889509A BE 0/205315 A BE0/205315 A BE 0/205315A BE 205315 A BE205315 A BE 205315A BE 889509 A BE889509 A BE 889509A
Authority
BE
Belgium
Prior art keywords
television system
cable television
cable
television
Prior art date
Application number
BE0/205315A
Other languages
English (en)
Inventor
E J Gargini
Original Assignee
Communications Patents Ltd
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 Communications Patents Ltd filed Critical Communications Patents Ltd
Publication of BE889509A publication Critical patent/BE889509A/fr

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
BE0/205315A 1980-07-05 1981-07-03 Systeme de television par cables BE889509A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8022111 1980-07-05

Publications (1)

Publication Number Publication Date
BE889509A true BE889509A (fr) 1981-11-03

Family

ID=10514570

Family Applications (1)

Application Number Title Priority Date Filing Date
BE0/205315A BE889509A (fr) 1980-07-05 1981-07-03 Systeme de television par cables

Country Status (6)

Country Link
US (1) US4398214A (fr)
BE (1) BE889509A (fr)
CA (1) CA1169543A (fr)
DE (1) DE3125767A1 (fr)
FR (1) FR2486340B1 (fr)
NL (1) NL8103152A (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4521809A (en) * 1982-12-29 1985-06-04 North American Philips Corporation Method and apparatus for controlling access to selected television programs
US4496986A (en) * 1983-01-11 1985-01-29 U.S. Philips Corporation Subscription television interface
US4682359A (en) * 1984-10-15 1987-07-21 Blonder-Tongue Laboratories, Inc. Television picture and sound scrambler and method
US4748667A (en) * 1986-11-04 1988-05-31 Scientific Atlanta Jamming signal scrambling and descrambling systems for CATV
US5617475A (en) * 1994-11-18 1997-04-01 General Instrument Corporation, G.I. Communications Division Scrambling and descrambling of video signals using horizontal line combinations

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2709218A (en) * 1945-03-06 1955-05-24 Leonide E Gabrilovitch Method and means for anti-jamming in radio
US3054857A (en) * 1955-04-18 1962-09-18 Paramount Pictures Corp Secrecy system
GB850824A (en) * 1957-07-02 1960-10-05 Rank Organisation Ltd Improvements in or relating to television systems
US3826863A (en) * 1973-02-09 1974-07-30 Oak Industries Inc Subscription television system using audio and video carrier reversal
US3857997A (en) * 1973-03-08 1974-12-31 Oak Industries Inc Cable converter with phase lock loop techniques
US3914534A (en) * 1973-10-29 1975-10-21 Magnavox Co Methods and apparatus for scrambling and unscrambling premium television channels
US4024575A (en) * 1974-03-15 1977-05-17 Oak Industries Inc. Catv sine wave coding system
US4091413A (en) * 1977-01-17 1978-05-23 Herman Richard E Security system for pay-TV channel
US4222067A (en) * 1978-06-23 1980-09-09 Stern Joseph L Tamper-resistant television signal scrambling
JPS5539444A (en) * 1978-09-13 1980-03-19 Pioneer Electronic Corp Scramble/descramble system for catv broadcast
FR2459595A1 (fr) * 1979-06-15 1981-01-09 Telediffusion Fse Systeme de television a controle d'acces utilisant une cle electronique variable

Also Published As

Publication number Publication date
CA1169543A (fr) 1984-06-19
NL8103152A (nl) 1982-02-01
FR2486340A1 (fr) 1982-01-08
FR2486340B1 (fr) 1986-10-31
US4398214A (en) 1983-08-09
DE3125767A1 (de) 1982-06-09

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: COMMUNICATIONS PATENTS LTD

Effective date: 19880731