SE9001672D0 - PAYMENT TV SYSTEM REQUEST - Google Patents
PAYMENT TV SYSTEM REQUESTInfo
- Publication number
- SE9001672D0 SE9001672D0 SE9001672A SE9001672A SE9001672D0 SE 9001672 D0 SE9001672 D0 SE 9001672D0 SE 9001672 A SE9001672 A SE 9001672A SE 9001672 A SE9001672 A SE 9001672A SE 9001672 D0 SE9001672 D0 SE 9001672D0
- Authority
- SE
- Sweden
- Prior art keywords
- obfuscation
- signal
- signals
- pass
- channels
- Prior art date
Links
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)
- Small-Scale Networks (AREA)
Abstract
An improved pay-TV-system, comprising a centrally located obfuscation signal generator, adapted to periodically pass to at least some TV-channels obfuscation signals, and control and communication device (12) to set which ones of the channels at the respective subscriber where unobfuscated receiving is authorized, comprising a centrally located coding device (K) to which a modulated TV-signal from the cable net (10) is passed, and which, within the band width of the TV-signal, via an obfuscation signal generator (13) passes to the modulated TV-signal data for the respective obfuscation signal, such as time, duration and frequency of the obfuscation signal, and, for each subscriber, a decoder (AK), comprising a sync unit and a filter, and adapted to receive obfuscation coded signals from the coding device, and, in dependence on control signals from the control and communication devices (12) on one hand, and the function of the sync unit on the other hand, to filtrate off the obfuscation signals on the channels where normal receiving is authorized in order to pass to an output terminal only decoded information signals. The system includes a logic circuit which is adapted to detect whether or not an obfuscation lies within the filter, and a device adapted to adjust the filter towards the obfuscation. Further, at least some of the decoding units (AK) are provided with a by-pass line, preferably including an amplifier (F), to provide a by-pass function.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9001672A SE9001672L (en) | 1990-05-09 | 1990-05-09 | DEVICE ON PAYMENT-TV SYSTEM |
AU78904/91A AU7890491A (en) | 1990-05-09 | 1991-04-30 | An improved pay-tv-system |
PCT/SE1991/000311 WO1991017630A1 (en) | 1990-05-09 | 1991-04-30 | An improved pay-tv-system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9001672A SE9001672L (en) | 1990-05-09 | 1990-05-09 | DEVICE ON PAYMENT-TV SYSTEM |
Publications (2)
Publication Number | Publication Date |
---|---|
SE9001672D0 true SE9001672D0 (en) | 1990-05-09 |
SE9001672L SE9001672L (en) | 1992-01-27 |
Family
ID=20379425
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE9001672A SE9001672L (en) | 1990-05-09 | 1990-05-09 | DEVICE ON PAYMENT-TV SYSTEM |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU7890491A (en) |
SE (1) | SE9001672L (en) |
WO (1) | WO1991017630A1 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3896262A (en) * | 1974-03-21 | 1975-07-22 | Hughes Aircraft Co | Subscription television jamming system |
US4841569A (en) * | 1987-12-30 | 1989-06-20 | General Instrument Corporation | Secure video distribution system |
SE8803814A0 (en) * | 1988-10-25 | 1990-04-26 | Spacenet Ab | Device for pay-TV systems |
-
1990
- 1990-05-09 SE SE9001672A patent/SE9001672L/en unknown
-
1991
- 1991-04-30 AU AU78904/91A patent/AU7890491A/en not_active Abandoned
- 1991-04-30 WO PCT/SE1991/000311 patent/WO1991017630A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
SE9001672L (en) | 1992-01-27 |
WO1991017630A1 (en) | 1991-11-14 |
AU7890491A (en) | 1991-11-27 |
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