IE55744B1 - Audio scrambler utilizing an auxiliary channel for synchronizing the descrambler - Google Patents

Audio scrambler utilizing an auxiliary channel for synchronizing the descrambler

Info

Publication number
IE55744B1
IE55744B1 IE56583A IE56583A IE55744B1 IE 55744 B1 IE55744 B1 IE 55744B1 IE 56583 A IE56583 A IE 56583A IE 56583 A IE56583 A IE 56583A IE 55744 B1 IE55744 B1 IE 55744B1
Authority
IE
Ireland
Prior art keywords
audio signal
digital
signal
scrambled
audio
Prior art date
Application number
IE56583A
Other languages
English (en)
Other versions
IE830565L (en
Original Assignee
Westinghouse Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of IE830565L publication Critical patent/IE830565L/en
Publication of IE55744B1 publication Critical patent/IE55744B1/en

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
IE56583A 1982-04-08 1983-03-16 Audio scrambler utilizing an auxiliary channel for synchronizing the descrambler IE55744B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US36662482A 1982-04-08 1982-04-08

Publications (2)

Publication Number Publication Date
IE830565L IE830565L (en) 1983-10-08
IE55744B1 true IE55744B1 (en) 1991-01-02

Family

ID=23443804

Family Applications (1)

Application Number Title Priority Date Filing Date
IE56583A IE55744B1 (en) 1982-04-08 1983-03-16 Audio scrambler utilizing an auxiliary channel for synchronizing the descrambler

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
EP0105906A1 (fr) 1984-04-25
CA1204162A (fr) 1986-05-06
IE830565L (en) 1983-10-08
WO1983003731A1 (fr) 1983-10-27

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