CA1150818A - Systeme de codage pour television a abonnement - Google Patents
Systeme de codage pour television a abonnementInfo
- Publication number
- CA1150818A CA1150818A CA000340211A CA340211A CA1150818A CA 1150818 A CA1150818 A CA 1150818A CA 000340211 A CA000340211 A CA 000340211A CA 340211 A CA340211 A CA 340211A CA 1150818 A CA1150818 A CA 1150818A
- Authority
- CA
- Canada
- Prior art keywords
- video
- signals
- clock
- horizontal
- suppressed
- 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
- H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
- H04N7/087—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only
- H04N7/088—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
- H04N7/084—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the horizontal blanking interval only
- H04N7/085—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the horizontal blanking interval only the inserted signal being digital
-
- 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)
- Television Systems (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US96594078A | 1978-12-04 | 1978-12-04 | |
US965,940 | 1978-12-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1150818A true CA1150818A (fr) | 1983-07-26 |
Family
ID=25510704
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA000340211A Expired CA1150818A (fr) | 1978-12-04 | 1979-11-20 | Systeme de codage pour television a abonnement |
Country Status (12)
Country | Link |
---|---|
JP (2) | JPS5588481A (fr) |
AU (1) | AU526049B2 (fr) |
BR (1) | BR7907803A (fr) |
CA (1) | CA1150818A (fr) |
CH (1) | CH661398A5 (fr) |
DE (1) | DE2947943C2 (fr) |
FR (1) | FR2443778B1 (fr) |
GB (1) | GB2038137B (fr) |
GR (1) | GR82329B (fr) |
IL (1) | IL58735A (fr) |
MX (1) | MX147755A (fr) |
NL (1) | NL188137C (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4594609A (en) * | 1983-06-30 | 1986-06-10 | Viewstar Inc. | Scrambling system for television video signal |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4340906A (en) * | 1980-05-14 | 1982-07-20 | Oak Industries Inc. | Video signal coding by video signal polarity reversal on the basis of brightness level comparison |
US4353088A (en) * | 1980-05-14 | 1982-10-05 | Oak Industries, Inc. | Coding and decoding system for video and audio signals |
US4336553A (en) * | 1980-05-14 | 1982-06-22 | Oak Industries | Method of coding audio and video signals |
US4621285A (en) * | 1980-12-10 | 1986-11-04 | Jerrold Division, General Instrument Corporation | Protected television signal distribution system |
CA1338158C (fr) * | 1982-07-15 | 1996-03-12 | John D. Lowry | Chiffrement et dechiffrement (brouillage et debrouillage) de signaux video |
DE3466636D1 (en) * | 1983-02-18 | 1987-11-05 | Sanyo Electric Co | Scrambling system of television signal |
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 |
DE3479952D1 (en) * | 1983-04-21 | 1989-11-02 | Gen Instrument Corp | Scrambling system for television video signal |
EP0133190A1 (fr) * | 1983-08-01 | 1985-02-20 | Payview Limited | Codage et décodage d'un signal de télévision |
AU560508B2 (en) * | 1984-02-15 | 1987-04-09 | Matsushita Electric Industrial Co., Ltd. | Pay tv delta encoded sound signal processing apparatus |
DE3432653C1 (de) * | 1984-09-05 | 1986-01-16 | Westdeutscher Rundfunk, Anstalt des öffentlichen Rechts, 5000 Köln | Verfahren zum Übertragen von Fersehprogrammen an berechtigte Teilnehmer |
FR2572612B1 (fr) * | 1984-10-31 | 1986-12-26 | Cgv Comp Gen Videotech | Interface entre decodeur video et recepteur de television |
US4815129A (en) * | 1985-01-02 | 1989-03-21 | General Instrument Corp. | Video encryption system |
DE3638554A1 (de) * | 1986-11-12 | 1988-05-26 | Siemens Ag | Verfahren und anordnung zum verschluesseln von digitalen videosignalen |
GB2216359B (en) * | 1988-03-18 | 1992-05-20 | Marconi Gec Ltd | Synchronisation |
WO1994017622A2 (fr) * | 1993-01-15 | 1994-08-04 | Nauchno-Proizvodstvennaya Firma 'elektronika Ltd.' | Procede de retransmission de donnees par l'intermediaire de canaux de television et son systeme de mise en ×uvre |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1287695A (fr) * | 1960-10-04 | 1962-03-16 | Paramount Pictures Corp | Systèmes de télévision payante |
US3184537A (en) * | 1960-10-04 | 1965-05-18 | Paramount Pictures Corp | Subscription-television system employing suppression of synchronizing signals |
US3485941A (en) * | 1965-04-12 | 1969-12-23 | R & R Research Ltd | Television system with modified sync signals and auxiliary timing information |
NL7016628A (fr) * | 1970-11-13 | 1972-05-16 | ||
JPS4924530A (fr) * | 1972-06-30 | 1974-03-05 | ||
JPS5236593B2 (fr) * | 1973-08-09 | 1977-09-16 | ||
US3919462A (en) * | 1973-08-15 | 1975-11-11 | System Dev Corp | Method and apparatus for scrambling and unscrambling communication signals |
JPS5120623A (ja) * | 1974-08-14 | 1976-02-19 | Matsushita Electric Ind Co Ltd | Shingodensohoshiki |
JPS5169927A (ja) * | 1974-12-13 | 1976-06-17 | Fujitsu Ltd | Terebijonfukugoeizoshingohoshiki |
FR2313825A1 (fr) * | 1975-06-06 | 1976-12-31 | Telediffusion Fse | Systeme de diffusion de donnees |
US4095258A (en) * | 1976-10-15 | 1978-06-13 | Blonder-Tongue Laboratories, Inc. | Apparatus for decoding scrambled television and similar transmissions |
JPS53113427A (en) * | 1977-03-15 | 1978-10-03 | Matsushita Electric Ind Co Ltd | Sampling clock reproducer |
-
1979
- 1979-11-16 IL IL58735A patent/IL58735A/xx unknown
- 1979-11-20 GR GR60551A patent/GR82329B/el unknown
- 1979-11-20 CA CA000340211A patent/CA1150818A/fr not_active Expired
- 1979-11-22 AU AU53097/79A patent/AU526049B2/en not_active Expired
- 1979-11-26 NL NLAANVRAGE7908569,A patent/NL188137C/xx not_active IP Right Cessation
- 1979-11-27 GB GB7940978A patent/GB2038137B/en not_active Expired
- 1979-11-28 DE DE2947943A patent/DE2947943C2/de not_active Expired
- 1979-11-29 CH CH10621/79A patent/CH661398A5/de not_active IP Right Cessation
- 1979-11-30 BR BR7907803A patent/BR7907803A/pt unknown
- 1979-12-03 FR FR7929682A patent/FR2443778B1/fr not_active Expired
- 1979-12-04 MX MX180309A patent/MX147755A/es unknown
- 1979-12-04 JP JP15732979A patent/JPS5588481A/ja active Pending
-
1988
- 1988-01-18 JP JP1988004588U patent/JPS63131287U/ja active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4594609A (en) * | 1983-06-30 | 1986-06-10 | Viewstar Inc. | Scrambling system for television video signal |
Also Published As
Publication number | Publication date |
---|---|
JPS63131287U (fr) | 1988-08-26 |
DE2947943A1 (de) | 1980-06-26 |
BR7907803A (pt) | 1980-07-29 |
FR2443778B1 (fr) | 1986-04-11 |
NL188137C (nl) | 1992-04-01 |
GR82329B (fr) | 1984-12-13 |
JPS5588481A (en) | 1980-07-04 |
IL58735A (en) | 1982-01-31 |
GB2038137B (en) | 1983-04-13 |
FR2443778A1 (fr) | 1980-07-04 |
DE2947943C2 (de) | 1985-04-18 |
GB2038137A (en) | 1980-07-16 |
MX147755A (es) | 1983-01-10 |
NL188137B (nl) | 1991-11-01 |
CH661398A5 (de) | 1987-07-15 |
IL58735A0 (en) | 1980-02-29 |
AU526049B2 (en) | 1982-12-16 |
NL7908569A (nl) | 1980-06-06 |
AU5309779A (en) | 1980-06-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MKEX | Expiry | ||
MKEX | Expiry |
Effective date: 20000726 |