SE9002372L - PROCEDURE AND DEVICE FOR ACCESS CONTROL OF DISTRIBUTION SYSTEM FOR SOUND, IMAGE AND / OR DATA - Google Patents

PROCEDURE AND DEVICE FOR ACCESS CONTROL OF DISTRIBUTION SYSTEM FOR SOUND, IMAGE AND / OR DATA

Info

Publication number
SE9002372L
SE9002372L SE9002372A SE9002372A SE9002372L SE 9002372 L SE9002372 L SE 9002372L SE 9002372 A SE9002372 A SE 9002372A SE 9002372 A SE9002372 A SE 9002372A SE 9002372 L SE9002372 L SE 9002372L
Authority
SE
Sweden
Prior art keywords
channels
converters
signals
sound
procedure
Prior art date
Application number
SE9002372A
Other languages
Swedish (sv)
Other versions
SE9002372D0 (en
SE504763C2 (en
Inventor
M Ellstroem
Original Assignee
Televerket
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 Televerket filed Critical Televerket
Priority to SE9002372A priority Critical patent/SE504763C2/en
Publication of SE9002372D0 publication Critical patent/SE9002372D0/en
Publication of SE9002372L publication Critical patent/SE9002372L/en
Publication of SE504763C2 publication Critical patent/SE504763C2/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
    • 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

Abstract

Channels contain programmes, access to which by viewers is controlled. The programme channels are fed into a distributer which divides the signals to six controllable down-converters which convert the frequencies of the channels to a mean frequency, e.g. 38.9 MHz. The down-converters are followed by a series of up-converters which convert the signals from the mean frequency to a number of distribution channels. Finally, the signals are reconnected together in a combiner, and transmitted into the distribution network, using cable and/or radio medium and/or optic fibre. A subscriber administration computer controls which programme channel is to be transmitted on the respective distribution channels. This can be changed so rapidly that no viewer has any possibility of manually following the channel shifting process.
SE9002372A 1990-07-06 1990-07-06 Access control in sound picture and/or data distribution SE504763C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE9002372A SE504763C2 (en) 1990-07-06 1990-07-06 Access control in sound picture and/or data distribution

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9002372A SE504763C2 (en) 1990-07-06 1990-07-06 Access control in sound picture and/or data distribution

Publications (3)

Publication Number Publication Date
SE9002372D0 SE9002372D0 (en) 1990-07-06
SE9002372L true SE9002372L (en) 1992-01-07
SE504763C2 SE504763C2 (en) 1997-04-21

Family

ID=20379958

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9002372A SE504763C2 (en) 1990-07-06 1990-07-06 Access control in sound picture and/or data distribution

Country Status (1)

Country Link
SE (1) SE504763C2 (en)

Also Published As

Publication number Publication date
SE9002372D0 (en) 1990-07-06
SE504763C2 (en) 1997-04-21

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Legal Events

Date Code Title Description
NUG Patent has lapsed