SE7606996L - System for rundradiering av data samtidigt med oberoende av televisionsprogram - Google Patents

System for rundradiering av data samtidigt med oberoende av televisionsprogram

Info

Publication number
SE7606996L
SE7606996L SE7606996A SE7606996A SE7606996L SE 7606996 L SE7606996 L SE 7606996L SE 7606996 A SE7606996 A SE 7606996A SE 7606996 A SE7606996 A SE 7606996A SE 7606996 L SE7606996 L SE 7606996L
Authority
SE
Sweden
Prior art keywords
signals
accordance
key
television programs
decoder
Prior art date
Application number
SE7606996A
Other languages
English (en)
Other versions
SE415436B (sv
Inventor
J H Barrett
Original Assignee
Dynamic Technology 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 Dynamic Technology Ltd filed Critical Dynamic Technology Ltd
Publication of SE7606996L publication Critical patent/SE7606996L/sv
Publication of SE415436B publication Critical patent/SE415436B/sv

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
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H04N7/087—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only
    • H04N7/088—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital
    • H04N7/0888—Subscription systems therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Television Systems (AREA)
SE7606996A 1975-06-20 1976-06-18 Televisionssystem SE415436B (sv)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB26345/75A GB1558168A (en) 1975-06-20 1975-06-20 Systems for broadcasting data simultaneously with but independently of television programmes

Publications (2)

Publication Number Publication Date
SE7606996L true SE7606996L (sv) 1976-12-21
SE415436B SE415436B (sv) 1980-09-29

Family

ID=10242215

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7606996A SE415436B (sv) 1975-06-20 1976-06-18 Televisionssystem

Country Status (7)

Country Link
US (1) US4205343A (sv)
AU (1) AU509088B2 (sv)
DE (1) DE2627703C2 (sv)
FR (1) FR2316821A1 (sv)
GB (1) GB1558168A (sv)
NL (1) NL7606638A (sv)
SE (1) SE415436B (sv)

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FR2457048A1 (fr) * 1979-05-16 1980-12-12 Telediffusion Fse Systeme de videotex muni de moyens de protection contre les erreurs de transmission
FR2459595A1 (fr) * 1979-06-15 1981-01-09 Telediffusion Fse Systeme de television a controle d'acces utilisant une cle electronique variable
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Also Published As

Publication number Publication date
GB1558168A (en) 1979-12-19
US4205343A (en) 1980-05-27
SE415436B (sv) 1980-09-29
AU1504676A (en) 1977-12-22
NL7606638A (nl) 1976-12-22
FR2316821A1 (fr) 1977-01-28
FR2316821B1 (sv) 1982-04-23
DE2627703A1 (de) 1977-01-13
AU509088B2 (en) 1980-04-17
DE2627703C2 (de) 1985-10-03

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