CA957764A - Encoding and decoding system for catv - Google Patents
Encoding and decoding system for catvInfo
- Publication number
- CA957764A CA957764A CA125,699A CA125669A CA957764A CA 957764 A CA957764 A CA 957764A CA 125669 A CA125669 A CA 125669A CA 957764 A CA957764 A CA 957764A
- Authority
- CA
- Canada
- Prior art keywords
- catv
- encoding
- decoding system
- decoding
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
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)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Television Systems (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA197,830A CA963572A (en) | 1971-02-08 | 1974-04-19 | Encoding and decoding system for catv |
CA197,831A CA963573A (en) | 1971-02-08 | 1974-04-19 | Encoding and decoding system for catv |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11339371A | 1971-02-08 | 1971-02-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
CA957764A true CA957764A (en) | 1974-11-12 |
Family
ID=22349137
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA125,699A Expired CA957764A (en) | 1971-02-08 | 1971-10-20 | Encoding and decoding system for catv |
Country Status (8)
Country | Link |
---|---|
US (1) | US3729576A (ja) |
JP (1) | JPS5623353B1 (ja) |
BE (1) | BE783622A (ja) |
CA (1) | CA957764A (ja) |
CH (1) | CH538796A (ja) |
DE (1) | DE2165409C3 (ja) |
FR (1) | FR2185907A1 (ja) |
GB (1) | GB1381903A (ja) |
Families Citing this family (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2385281A2 (fr) * | 1974-03-15 | 1978-10-20 | Oak Industries Inc | Dispositif de decodage de signaux de television |
US4024575A (en) * | 1974-03-15 | 1977-05-17 | Oak Industries Inc. | Catv sine wave coding system |
CH575694A5 (ja) * | 1974-03-15 | 1976-05-14 | Oak Industries Inc | |
DE2416086C2 (de) * | 1974-04-01 | 1983-09-01 | Blonder-Tongue Laboratories, Inc., Old Bridge, N.J. | Verfahren zum Senden und Empfangen von verschlüsselten Fernsehsignalen |
US3936593A (en) * | 1974-08-05 | 1976-02-03 | Gte Laboratories Incorporated | Scrambler and decoder for a television signal |
US3996418A (en) * | 1974-08-05 | 1976-12-07 | Gte Laboratories Incorporated | Scrambler and decoder for secure television system |
JPS51115718A (en) * | 1975-02-24 | 1976-10-12 | Pioneer Electronic Corp | Bi-directional catv system |
JPS5818832B2 (ja) * | 1975-10-02 | 1983-04-14 | パイオニア株式会社 | 映像信号伝送におけるスクランブル装置 |
JPS6057270B2 (ja) * | 1976-04-23 | 1985-12-13 | パイオニア株式会社 | Catvシステムにおけるデイスクランブル装置 |
US4095258A (en) * | 1976-10-15 | 1978-06-13 | Blonder-Tongue Laboratories, Inc. | Apparatus for decoding scrambled television and similar transmissions |
US4145717A (en) * | 1977-05-11 | 1979-03-20 | Oak Industries Inc. | Subscription TV audio carrier recovery system |
JPS5539444A (en) * | 1978-09-13 | 1980-03-19 | Pioneer Electronic Corp | Scramble/descramble system for catv broadcast |
JPS57164682A (en) * | 1981-04-02 | 1982-10-09 | Alps Electric Co Ltd | Data processing circuit |
US4454543A (en) * | 1981-11-06 | 1984-06-12 | Oak Industries Inc. | Dynamic video scrambling |
US4466017A (en) * | 1981-12-23 | 1984-08-14 | Scientific-Atlanta, Inc. | Sync suppression scrambling of television signals for subscription TV |
US4489347A (en) * | 1982-08-30 | 1984-12-18 | Zenith Radio Corporation | Sine-wave decoding technique |
JPS59152786A (ja) * | 1983-02-18 | 1984-08-31 | Sanyo Electric Co Ltd | Catv放送におけるスクランブル方式 |
US4590519A (en) * | 1983-05-04 | 1986-05-20 | Regency Electronics, Inc. | Television signal scrambling/descrambling system |
US4636852A (en) * | 1984-01-26 | 1987-01-13 | Scientific-Atlanta, Inc. | Scrambling and descrambling of television signals for subscription TV |
US5091935A (en) * | 1984-01-27 | 1992-02-25 | Maast, Inc. | Method and system for scrambling information signals |
JPS63292790A (ja) * | 1987-05-23 | 1988-11-30 | Sony Corp | デイスパ−サル信号除去回路 |
US5022078A (en) * | 1990-03-08 | 1991-06-04 | Andrew F. Tresness | Television signal enhancement and scrambling system |
US5671278A (en) * | 1995-05-19 | 1997-09-23 | Pires; H. George | Video scrambling with variable function generator |
US6081599A (en) * | 1997-12-01 | 2000-06-27 | Tresness Irrevocable Patent Trust | Saw television scrambling system |
US7116374B2 (en) * | 2003-08-26 | 2006-10-03 | Koplar Interactive Systems International, L.L.C. | Method and system for enhanced modulation of video signals |
ES2362759B1 (es) * | 2008-04-14 | 2012-06-06 | Fundacio Privada Centre Tecnologic De Telecomunicacions De Catalunya | Procedimiento y dispositivo de comunicaciones digitales para la recepción de datos usando simbolos qam. |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3081376A (en) * | 1959-03-23 | 1963-03-12 | Zenith Radio Corp | Subscription television system |
US3184537A (en) * | 1960-10-04 | 1965-05-18 | Paramount Pictures Corp | Subscription-television system employing suppression of synchronizing signals |
-
1971
- 1971-02-08 US US00113393A patent/US3729576A/en not_active Expired - Lifetime
- 1971-10-20 CA CA125,699A patent/CA957764A/en not_active Expired
- 1971-10-27 JP JP8545071A patent/JPS5623353B1/ja active Pending
- 1971-12-29 DE DE2165409A patent/DE2165409C3/de not_active Expired
-
1972
- 1972-01-25 GB GB347672A patent/GB1381903A/en not_active Expired
- 1972-05-17 BE BE783622A patent/BE783622A/xx unknown
- 1972-05-25 FR FR7218652A patent/FR2185907A1/fr not_active Withdrawn
- 1972-07-05 CH CH1007672A patent/CH538796A/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE2165409A1 (de) | 1972-09-28 |
BE783622A (fr) | 1972-09-18 |
JPS5623353B1 (ja) | 1981-05-30 |
FR2185907A1 (ja) | 1974-01-04 |
DE2165409B2 (de) | 1973-05-24 |
US3729576A (en) | 1973-04-24 |
CH538796A (de) | 1973-08-15 |
DE2165409C3 (de) | 1973-12-06 |
GB1381903A (en) | 1975-01-29 |
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