CA1204162A - 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
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
Application number
CA000424946A
Other languages
English (en)
French (fr)
Inventor
Leslie D. Thomas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Westinghouse Electric Corp
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
Application granted granted Critical
Publication of CA1204162A publication Critical patent/CA1204162A/en
Expired legal-status Critical Current

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)
CA000424946A 1982-04-08 1983-03-30 Audio scrambler utilizing an auxiliary channel for synchronizing the descrambler Expired CA1204162A (en)

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 (en) 1986-05-06

Family

ID=23443804

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000424946A Expired CA1204162A (en) 1982-04-08 1983-03-30 Audio scrambler utilizing an auxiliary channel for synchronizing the descrambler

Country Status (4)

Country Link
EP (1) EP0105906A1 (de)
CA (1) CA1204162A (de)
IE (1) IE55744B1 (de)
WO (1) WO1983003731A1 (de)

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 (de) 1984-04-25
IE55744B1 (en) 1991-01-02
IE830565L (en) 1983-10-08
WO1983003731A1 (en) 1983-10-27

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Legal Events

Date Code Title Description
MKEX Expiry
MKEX Expiry

Effective date: 20030506