DK7186A - Fremgangsmaade til kodning og dekodning af information og apparat til udaevelse af fremgangsmaaden - Google Patents
Fremgangsmaade til kodning og dekodning af information og apparat til udaevelse af fremgangsmaaden Download PDFInfo
- Publication number
- DK7186A DK7186A DK7186A DK7186A DK7186A DK 7186 A DK7186 A DK 7186A DK 7186 A DK7186 A DK 7186A DK 7186 A DK7186 A DK 7186A DK 7186 A DK7186 A DK 7186A
- Authority
- DK
- Denmark
- Prior art keywords
- procedure
- signal
- coding
- converting
- digital signal
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
- H04K1/06—Secret communication by transmitting the information or elements thereof at unnatural speeds or in jumbled order or backwards
-
- 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
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
- H04N7/169—Systems operating in the time domain of the television signal
- H04N7/1696—Systems operating in the time domain of the television signal by changing or reversing the order of active picture signal portions
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computer Security & Cryptography (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Communication Control (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Dc Digital Transmission (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE0/214310A BE901468A (fr) | 1985-01-09 | 1985-01-09 | Procede de codage et de decodage d'informations et appareil pour sa mise en oeuvre. |
Publications (2)
Publication Number | Publication Date |
---|---|
DK7186D0 DK7186D0 (da) | 1986-01-08 |
DK7186A true DK7186A (da) | 1986-07-10 |
Family
ID=3843840
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DK7186A DK7186A (da) | 1985-01-09 | 1986-01-08 | Fremgangsmaade til kodning og dekodning af information og apparat til udaevelse af fremgangsmaaden |
Country Status (12)
Country | Link |
---|---|
US (1) | US4731839A (da) |
EP (1) | EP0188030B1 (da) |
JP (1) | JPS61256881A (da) |
AT (1) | ATE74247T1 (da) |
AU (1) | AU587003B2 (da) |
BE (1) | BE901468A (da) |
BR (1) | BR8600057A (da) |
CA (1) | CA1291559C (da) |
DE (1) | DE3585732D1 (da) |
DK (1) | DK7186A (da) |
ES (1) | ES8706298A1 (da) |
NO (1) | NO167179C (da) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4821097A (en) * | 1987-03-05 | 1989-04-11 | General Instrument Corporation | Apparatus and method for providing digital audio on the sound carrier of a standard television signal |
GB2207328A (en) * | 1987-07-20 | 1989-01-25 | British Broadcasting Corp | Scrambling of analogue electrical signals |
US5040211A (en) * | 1988-10-13 | 1991-08-13 | Massachusetts Institute Of Technology | Reliable television transmission through analog channels |
FR2638045A1 (fr) * | 1989-10-31 | 1990-04-20 | Belloli Pascal | Encodeur-decodeur video et/ou audio |
US5844737A (en) * | 1990-11-14 | 1998-12-01 | Canon Kabushiki Kaisha | Reproducing apparatus with different reproduction data for normal and search modes which scans two areas of a split tape recording medium in opposite directions |
US5253296A (en) * | 1991-11-26 | 1993-10-12 | Communication Electronics | System for resisting interception of information |
SE9301236L (sv) * | 1993-04-15 | 1994-10-16 | Erik Rickard Soederqvist | Sätt och anordning för koordinerad kodning och avkodning av en TV-signal eller annan meddelande signal |
FR2716597B1 (fr) * | 1994-02-21 | 1996-06-14 | Visiorep Sarl | Système de cryptage et contrôle d'accés pour abonnés à des services de télévision et vidéo multiniveaux. |
US5606612A (en) * | 1994-07-25 | 1997-02-25 | General Instrument Corporation, Jerrold Communications Division | Method and apparatus for television signal scrambling using a line expansion technique |
US7146007B1 (en) * | 2000-03-29 | 2006-12-05 | Sony Corporation | Secure conditional access port interface |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1097794A (en) * | 1975-08-08 | 1981-03-17 | Harold B. Shutterly | Secure television transmission system |
US4221931A (en) * | 1977-10-17 | 1980-09-09 | Harris Corporation | Time division multiplied speech scrambler |
GB1590579A (en) * | 1977-12-16 | 1981-06-03 | Micro Consultants Ltd | Information scrambler system |
US4266243A (en) * | 1979-04-25 | 1981-05-05 | Westinghouse Electric Corp. | Scrambling system for television sound signals |
US4443660A (en) * | 1980-02-04 | 1984-04-17 | Rockwell International Corporation | System and method for encrypting a voice signal |
AU562395B2 (en) * | 1981-09-10 | 1987-06-11 | Sony Corporation | Subscription television system |
AU1888183A (en) * | 1982-07-29 | 1984-02-23 | Telease, Inc. | Secure coding and decoding system and method for television program signals |
FR2533099A1 (fr) * | 1982-09-14 | 1984-03-16 | Radiotechnique | Procede de brouillage d'images de television et dispositif de dechiffrage d'images ainsi brouillees |
US4575754A (en) * | 1983-01-06 | 1986-03-11 | Rca Corporation | Video scrambler system |
FR2543386B1 (fr) * | 1983-03-21 | 1987-03-20 | Telediffusion Fse | Procedes et dispositifs d'embrouillage et de desembrouillage pour images de television |
US4604650A (en) * | 1983-05-17 | 1986-08-05 | Westinghouse Electric Corp. | Three line video scrambling method |
US4563702A (en) * | 1983-05-27 | 1986-01-07 | M/A-Com Linkabit, Inc. | Video signal scrambling and descrambling systems |
US4605961A (en) * | 1983-12-22 | 1986-08-12 | Frederiksen Jeffrey E | Video transmission system using time-warp scrambling |
-
1985
- 1985-01-09 BE BE0/214310A patent/BE901468A/fr not_active IP Right Cessation
- 1985-12-30 NO NO855385A patent/NO167179C/no unknown
- 1985-12-31 EP EP85202124A patent/EP0188030B1/fr not_active Expired - Lifetime
- 1985-12-31 DE DE8585202124T patent/DE3585732D1/de not_active Expired - Fee Related
- 1985-12-31 AT AT85202124T patent/ATE74247T1/de not_active IP Right Cessation
-
1986
- 1986-01-02 AU AU51791/86A patent/AU587003B2/en not_active Ceased
- 1986-01-06 US US06/816,635 patent/US4731839A/en not_active Expired - Fee Related
- 1986-01-08 CA CA000499246A patent/CA1291559C/en not_active Expired - Lifetime
- 1986-01-08 BR BR8600057A patent/BR8600057A/pt not_active IP Right Cessation
- 1986-01-08 DK DK7186A patent/DK7186A/da not_active Application Discontinuation
- 1986-01-09 JP JP61001470A patent/JPS61256881A/ja active Pending
- 1986-01-09 ES ES550771A patent/ES8706298A1/es not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US4731839A (en) | 1988-03-15 |
BE901468A (fr) | 1985-05-02 |
CA1291559C (en) | 1991-10-29 |
NO855385L (no) | 1986-07-10 |
BR8600057A (pt) | 1986-09-23 |
AU5179186A (en) | 1986-07-17 |
ES550771A0 (es) | 1987-05-16 |
EP0188030B1 (fr) | 1992-03-25 |
EP0188030A3 (en) | 1987-08-19 |
ATE74247T1 (de) | 1992-04-15 |
NO167179C (no) | 1991-10-09 |
JPS61256881A (ja) | 1986-11-14 |
AU587003B2 (en) | 1989-08-03 |
NO167179B (no) | 1991-07-01 |
ES8706298A1 (es) | 1987-05-16 |
EP0188030A2 (fr) | 1986-07-23 |
DK7186D0 (da) | 1986-01-08 |
DE3585732D1 (de) | 1992-04-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AHB | Application shelved due to non-payment |