BE534753A - - Google Patents
Info
- Publication number
- BE534753A BE534753A BE534753DA BE534753A BE 534753 A BE534753 A BE 534753A BE 534753D A BE534753D A BE 534753DA BE 534753 A BE534753 A BE 534753A
- Authority
- BE
- Belgium
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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
- H04K1/006—Secret communication by varying or inverting the phase, at periodic or random intervals
-
- 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
- H04N7/1693—Systems operating in the time domain of the television signal by displacing synchronisation signals relative to active picture signals or vice versa
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Television Systems (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Noise Elimination (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB36022/54A GB796858A (en) | 1954-12-13 | 1954-12-13 | Improvements in or relating to subscription television system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE534753A true BE534753A (instruction) | 1958-10-10 |
Family
ID=10384097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE534753D BE534753A (instruction) | 1954-12-13 | 1955-01-10 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2910526A (instruction) |
| BE (1) | BE534753A (instruction) |
| CH (1) | CH342258A (instruction) |
| DE (1) | DE1073028B (instruction) |
| FR (1) | FR1120543A (instruction) |
| GB (2) | GB796858A (instruction) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2486746A1 (fr) * | 1980-07-11 | 1982-01-15 | Telediffusion Fse | Procede de brouillage et de debrouillage d'images de television |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2972009A (en) * | 1957-08-01 | 1961-02-14 | Zenith Radio Corp | Subscription television system |
| US2926214A (en) * | 1957-09-26 | 1960-02-23 | Zenith Radio Corp | Subscription television system |
| US4636852A (en) * | 1984-01-26 | 1987-01-13 | Scientific-Atlanta, Inc. | Scrambling and descrambling of television signals for subscription TV |
| US4916736A (en) * | 1988-06-07 | 1990-04-10 | Macrovision Corporation | Method and apparatus for encrypting and decrypting time domain signals |
| US5058157A (en) * | 1989-09-06 | 1991-10-15 | Macrovision Corporation | Method and apparatus for encrypting and decrypting time domain signals |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2656407A (en) * | 1949-02-12 | 1953-10-20 | Zenith Radio Corp | Subscriber signaling system |
| US2619530A (en) * | 1949-11-19 | 1952-11-25 | Zenith Radio Corp | Control system for subscription type television receivers |
| US2816156A (en) * | 1951-06-08 | 1957-12-10 | Zenith Radio Corp | Subscription television system |
| US2697741A (en) * | 1953-04-29 | 1954-12-21 | Zenith Radio Corp | Subscription television system |
-
1953
- 1953-07-24 US US370174A patent/US2910526A/en not_active Expired - Lifetime
-
1954
- 1954-12-13 GB GB36022/54A patent/GB796858A/en not_active Expired
- 1954-12-13 GB GB12670/56A patent/GB796859A/en not_active Expired
-
1955
- 1955-01-07 DE DE1955Z0004656 patent/DE1073028B/de active Pending
- 1955-01-10 FR FR1120543D patent/FR1120543A/fr not_active Expired
- 1955-01-10 BE BE534753D patent/BE534753A/xx unknown
- 1955-01-11 CH CH342258D patent/CH342258A/de unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2486746A1 (fr) * | 1980-07-11 | 1982-01-15 | Telediffusion Fse | Procede de brouillage et de debrouillage d'images de television |
Also Published As
| Publication number | Publication date |
|---|---|
| GB796858A (en) | 1958-06-18 |
| US2910526A (en) | 1959-10-27 |
| CH342258A (de) | 1959-11-15 |
| FR1120543A (fr) | 1956-07-09 |
| GB796859A (en) | 1958-06-18 |
| DE1073028B (de) | 1960-01-14 |