FR2385281A2 - Dispositif de decodage de signaux de television - Google Patents
Dispositif de decodage de signaux de televisionInfo
- Publication number
- FR2385281A2 FR2385281A2 FR7709070A FR7709070A FR2385281A2 FR 2385281 A2 FR2385281 A2 FR 2385281A2 FR 7709070 A FR7709070 A FR 7709070A FR 7709070 A FR7709070 A FR 7709070A FR 2385281 A2 FR2385281 A2 FR 2385281A2
- Authority
- FR
- France
- Prior art keywords
- audio
- video
- signals
- decoder
- noise
- 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.)
- Granted
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)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
L'invention concerne les dispositifs de décodage. Elle se rapporte à un dispositif de décodage d'un signal de télévision brouillé par une onde sinusoïdale à fréquence constante, à l'aide d'un circuit de réglage automatique de gain monté dans une boucle fermée. Selon l'invention, l'amplitude de l'onde sinusoïdale de brouillage de la porteuse acoustique est supérieure à celle de la porteuse vidéo. Application à la transmission de programmes aux abonnés de circuits de télévision par câble.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7709070A FR2385281A2 (fr) | 1974-03-15 | 1977-03-25 | Dispositif de decodage de signaux de television |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US45149074A | 1974-03-15 | 1974-03-15 | |
FR7709070A FR2385281A2 (fr) | 1974-03-15 | 1977-03-25 | Dispositif de decodage de signaux de television |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2385281A2 true FR2385281A2 (fr) | 1978-10-20 |
FR2385281B2 FR2385281B2 (fr) | 1984-04-27 |
Family
ID=26219931
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7709070A Granted FR2385281A2 (fr) | 1974-03-15 | 1977-03-25 | Dispositif de decodage de signaux de television |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2385281A2 (fr) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3777053A (en) * | 1972-05-16 | 1973-12-04 | Optical Systems Corp | Converter for catv |
FR2185907A1 (fr) * | 1971-02-08 | 1974-01-04 | Optical Systems Corp | |
FR2264448A1 (fr) * | 1974-03-15 | 1975-10-10 | Oak Industries Inc |
-
1977
- 1977-03-25 FR FR7709070A patent/FR2385281A2/fr active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2185907A1 (fr) * | 1971-02-08 | 1974-01-04 | Optical Systems Corp | |
US3777053A (en) * | 1972-05-16 | 1973-12-04 | Optical Systems Corp | Converter for catv |
FR2264448A1 (fr) * | 1974-03-15 | 1975-10-10 | Oak Industries Inc |
Also Published As
Publication number | Publication date |
---|---|
FR2385281B2 (fr) | 1984-04-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
TP | Transmission of property |