SE9100986D0 - TV SIGNAL TRANSFER PAY-TV SYSTEM - Google Patents
TV SIGNAL TRANSFER PAY-TV SYSTEMInfo
- Publication number
- SE9100986D0 SE9100986D0 SE9100986A SE9100986A SE9100986D0 SE 9100986 D0 SE9100986 D0 SE 9100986D0 SE 9100986 A SE9100986 A SE 9100986A SE 9100986 A SE9100986 A SE 9100986A SE 9100986 D0 SE9100986 D0 SE 9100986D0
- Authority
- SE
- Sweden
- Prior art keywords
- signal
- transmitter
- receivers
- signals according
- subscribed
- Prior art date
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
- H04N7/171—Systems operating in the amplitude domain of the television signal
- H04N7/1713—Systems operating in the amplitude domain of the television signal by modifying synchronisation signals
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Television Systems (AREA)
Abstract
The present invention relates to a TV-signal transmission pay-TV-system which includes a transmitter, a number of system-subscribed receivers (13), a number of non-subscribed receivers (16), and a signal transmission medium (6, 7, 8) which connects the transmitter with respective receivers, wherein the transmitter is provided with, or coacts with a signal scrambling device and respective system-subscribed receivers are provided with or preceded by a signal-unscrambling device (14), wherein the signal-scrambling device and the signal-unscrambling device (14) are mutually so adapted as to unscramble a scrambled TV-signal transmitted from the transmitter and thereby regenerate a signal in its correct form, so as to form picture-correct lines and pictures and possibly also sound, while non-system subscribed receivers (16) receive distorted lines, pictures and possibly also distorted sound from the scrambled TV-signal, and wherein line signals according to a first system (MAC) are transmitted via the signal transmission medium. The system includes a first means (44) which functions to inhibit a first selected part ("a") of the line signals according to a second system (PAL) and a second means (44) functions to enable a second selected part to be applied to the line signals according to the PAL-system with a signal structure that conforms to the first system, (MAC).
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9100986A SE466727B (en) | 1991-04-04 | 1991-04-04 | TV SIGNAL TRANSFER PAY-TV SYSTEM |
PCT/SE1992/000148 WO1992017984A1 (en) | 1991-04-04 | 1992-03-10 | Tv-signal transmission pay-tv-system |
AU13477/92A AU1347792A (en) | 1991-04-04 | 1992-03-10 | Tv-signal transmission pay-tv-system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9100986A SE466727B (en) | 1991-04-04 | 1991-04-04 | TV SIGNAL TRANSFER PAY-TV SYSTEM |
Publications (3)
Publication Number | Publication Date |
---|---|
SE9100986D0 true SE9100986D0 (en) | 1991-04-04 |
SE466727B SE466727B (en) | 1992-03-23 |
SE9100986A SE9100986A (en) | 1992-03-30 |
Family
ID=20382350
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE9100986A SE466727B (en) | 1991-04-04 | 1991-04-04 | TV SIGNAL TRANSFER PAY-TV SYSTEM |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU1347792A (en) |
SE (1) | SE466727B (en) |
WO (1) | WO1992017984A1 (en) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2541841A1 (en) * | 1983-02-25 | 1984-08-31 | Radiotechnique | DEVICE FOR DE-RECORDING TELEVISION IMAGES BROUGHT BY APPLICATION TO VIDEO SIGNALS OF CIRCULAR PERMUTATIONS |
US4642688A (en) * | 1983-06-24 | 1987-02-10 | Scientific Atlanta, Inc. | Method and apparatus for creating encrypted and decrypted television signals |
-
1991
- 1991-04-04 SE SE9100986A patent/SE466727B/en not_active IP Right Cessation
-
1992
- 1992-03-10 WO PCT/SE1992/000148 patent/WO1992017984A1/en active Application Filing
- 1992-03-10 AU AU13477/92A patent/AU1347792A/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
SE9100986A (en) | 1992-03-30 |
SE466727B (en) | 1992-03-23 |
WO1992017984A1 (en) | 1992-10-15 |
AU1347792A (en) | 1992-11-02 |
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