CA1204162A - Embrouilleur audio utilisant un canal auxiliaire pour synchroniser le desembrouilleur - Google Patents
Embrouilleur audio utilisant un canal auxiliaire pour synchroniser le desembrouilleurInfo
- Publication number
- CA1204162A CA1204162A CA000424946A CA424946A CA1204162A CA 1204162 A CA1204162 A CA 1204162A CA 000424946 A CA000424946 A CA 000424946A CA 424946 A CA424946 A CA 424946A CA 1204162 A CA1204162 A CA 1204162A
- Authority
- CA
- Canada
- Prior art keywords
- audio signal
- digital
- signal
- scrambled
- pseudo
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
- H04K1/02—Secret communication by adding a second signal to make the desired signal unintelligible
-
- 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
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US36662482A | 1982-04-08 | 1982-04-08 | |
US366,624 | 1982-04-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1204162A true CA1204162A (fr) | 1986-05-06 |
Family
ID=23443804
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA000424946A Expired CA1204162A (fr) | 1982-04-08 | 1983-03-30 | Embrouilleur audio utilisant un canal auxiliaire pour synchroniser le desembrouilleur |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0105906A1 (fr) |
CA (1) | CA1204162A (fr) |
IE (1) | IE55744B1 (fr) |
WO (1) | WO1983003731A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2140656A (en) * | 1983-05-13 | 1984-11-28 | Philips Electronic Associated | Television transmission system |
DE3343307A1 (de) * | 1983-11-30 | 1985-06-05 | Blaupunkt-Werke Gmbh, 3200 Hildesheim | Verfahren zum verschluesseln und entschluesseln von analogen signalen, sowie schaltungsanordnung zur durchfuehrung des verfahrens |
US4599646A (en) * | 1984-05-18 | 1986-07-08 | D-Tec Industries, Inc. | Method and apparatus for identifying unauthorized or defective converter/decoder boxes in CATV system |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3746799A (en) * | 1971-09-27 | 1973-07-17 | Us Navy | Method and apparatus for encoding and decoding analog signals |
US4086435A (en) * | 1976-09-17 | 1978-04-25 | Biosystems Research Group Ii | Method of and means for scrambling and descrambling speech at audio frequencies |
US4221931A (en) * | 1977-10-17 | 1980-09-09 | Harris Corporation | Time division multiplied speech scrambler |
US4215366A (en) * | 1977-10-19 | 1980-07-29 | Feature Film Services | Subscriber-limited reception television broadcast security encoder-decoder system |
US4318125A (en) * | 1979-04-25 | 1982-03-02 | Westinghouse Electric Corp. | Solid state digital audio scrambler system for teletransmission of audio intelligence through a television system |
US4295223A (en) * | 1979-04-25 | 1981-10-13 | Westinghouse Electric Corp. | Digital signal/noise ratio amplifier apparatus for a communication system |
-
1983
- 1983-03-16 IE IE56583A patent/IE55744B1/en unknown
- 1983-03-23 EP EP19830901503 patent/EP0105906A1/fr not_active Withdrawn
- 1983-03-23 WO PCT/US1983/000408 patent/WO1983003731A1/fr unknown
- 1983-03-30 CA CA000424946A patent/CA1204162A/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
IE55744B1 (en) | 1991-01-02 |
EP0105906A1 (fr) | 1984-04-25 |
WO1983003731A1 (fr) | 1983-10-27 |
IE830565L (en) | 1983-10-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MKEX | Expiry | ||
MKEX | Expiry |
Effective date: 20030506 |