CA2094228A1 - Video recorder - Google Patents

Video recorder

Info

Publication number
CA2094228A1
CA2094228A1 CA2094228A CA2094228A CA2094228A1 CA 2094228 A1 CA2094228 A1 CA 2094228A1 CA 2094228 A CA2094228 A CA 2094228A CA 2094228 A CA2094228 A CA 2094228A CA 2094228 A1 CA2094228 A1 CA 2094228A1
Authority
CA
Canada
Prior art keywords
output
shift register
address
key data
horizontal scan
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
Application number
CA2094228A
Other languages
French (fr)
Other versions
CA2094228C (en
Inventor
Masayoshi Hirashima
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of CA2094228A1 publication Critical patent/CA2094228A1/en
Application granted granted Critical
Publication of CA2094228C publication Critical patent/CA2094228C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91357—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal
    • H04N2005/91364—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal the video signal being scrambled

Abstract

A scramble codec comprises a nonvolatile key data memory which holds a key data varying from one video recorder to another, a pair of line memories in which input picture signals are alternatively written for each horizontal scan line, a nonlinear feedback shift register which is initialized with the output of the key data memory to output dissimilar pseudorandum pulse signals for respective horizontal scan lines, an address setting circuit which sets, as the initial value for scrambling, a value corresponding to the output of the nonlinear feedback shift register and, as the initial value for descrambling, a value obtained by subtracting the output of the nonlinear feedback shift register from the maximum address value of each line memory and an address counter which generates a consecutive series of addresses beginning with the address set by the above address setting circuit and applies a signal for each horizontal scan line alternately to the pair of line memories.
CA002094228A 1992-04-17 1993-04-16 Video recorder Expired - Fee Related CA2094228C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4-125583 1992-04-17
JP12558392 1992-04-17

Publications (2)

Publication Number Publication Date
CA2094228A1 true CA2094228A1 (en) 1993-10-18
CA2094228C CA2094228C (en) 2000-06-20

Family

ID=14913775

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002094228A Expired - Fee Related CA2094228C (en) 1992-04-17 1993-04-16 Video recorder

Country Status (4)

Country Link
US (1) US5455860A (en)
EP (1) EP0571753B1 (en)
CA (1) CA2094228C (en)
DE (1) DE69324188T2 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0620690B1 (en) * 1993-04-15 1999-01-27 Matsushita Electric Industrial Co., Ltd. Video signal encrypting apparatus
KR100332743B1 (en) * 1994-11-26 2002-11-07 엘지전자주식회사 Device and method for preventing illegal copy or unauthorized watching of digital image
FR2730116A1 (en) * 1995-01-31 1996-08-02 Thomson Broadband Systems SYSTEM FOR DEPARTURE OF A TELEVISION SIGNAL BROKER
KR0166923B1 (en) * 1995-09-18 1999-03-20 구자홍 Method and apparatus of preventing an illegal watching and copying in a digital broadcasting system
US6032242A (en) * 1997-10-15 2000-02-29 Industrial Technology Research Institute Methods and systems for generating alternate and zigzag address scans based on feedback addresses of alternate and zigzag access patterns
JP5198572B2 (en) * 2008-10-07 2013-05-15 富士通株式会社 Encryption device
US9497020B1 (en) 2015-05-26 2016-11-15 International Business Machines Corporation Initializing a descrambler
US9515813B1 (en) 2015-05-26 2016-12-06 International Business Machines Corporation Initializing a descrambler
CN108694896B (en) * 2017-06-09 2021-11-16 京东方科技集团股份有限公司 Signal transmission method, transmitting unit, receiving unit and display device

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1097794A (en) * 1975-08-08 1981-03-17 Harold B. Shutterly Secure television transmission system
GB2067871A (en) * 1980-01-19 1981-07-30 Marconi Co Ltd Information Encoding Systems
JPS5723367A (en) * 1980-07-17 1982-02-06 Matsushita Electric Ind Co Ltd Video signal recording and reproducing system
FR2541841A1 (en) * 1983-02-25 1984-08-31 Radiotechnique DEVICE FOR DE-RECORDING TELEVISION IMAGES BROUGHT BY APPLICATION TO VIDEO SIGNALS OF CIRCULAR PERMUTATIONS
FR2543386B1 (en) * 1983-03-21 1987-03-20 Telediffusion Fse METHODS AND DEVICES FOR SCRAMBLING AND SCRAMBLING FOR TELEVISION IMAGES
US4547802A (en) * 1983-04-29 1985-10-15 Westinghouse Electric Corp. TV Scrambler/descrambler using serial memories
DE3343307A1 (en) * 1983-11-30 1985-06-05 Blaupunkt-Werke Gmbh, 3200 Hildesheim METHOD FOR ENCRYPTING AND DECRYLING ANALOG SIGNALS, AND CIRCUIT ARRANGEMENT FOR IMPLEMENTING THE METHOD
US4682360A (en) * 1983-12-22 1987-07-21 Frederiksen Jeffrey E Video transmission system
US4680791A (en) * 1984-05-31 1987-07-14 Nec Corporation Digital video signal process apparatus for use in a video tape recorder
CA1244090A (en) * 1984-10-26 1988-11-01 General Instrument Corporation Cryptographic system for direct broadcast satellite network
US4723282A (en) * 1985-01-08 1988-02-02 U.S. Philips Corporation Method and apparatus of decoding and deciphering a rotated video signal
US4796299A (en) * 1985-08-22 1989-01-03 Itt Corporation Video encoder apparatus
GB2207328A (en) * 1987-07-20 1989-01-25 British Broadcasting Corp Scrambling of analogue electrical signals
FR2645384B1 (en) * 1989-04-04 1995-09-01 Europ Rech Electr Lab DEVICE AND METHOD FOR GENERATING CONTROL SIGNALS
US5058159A (en) * 1989-06-15 1991-10-15 Macrovision Corporation Method and system for scrambling and descrambling audio information signals
SE464271B (en) * 1990-03-23 1991-03-25 Televerket PROCEDURE AND DEVICE FOR THE Cryptography / Decryption of Digital Multitud
US5091938B1 (en) * 1990-08-06 1997-02-04 Nippon Denki Home Electronics Digital data cryptographic system

Also Published As

Publication number Publication date
EP0571753A3 (en) 1994-09-14
DE69324188T2 (en) 1999-07-22
EP0571753A2 (en) 1993-12-01
US5455860A (en) 1995-10-03
EP0571753B1 (en) 1999-03-31
DE69324188D1 (en) 1999-05-06
CA2094228C (en) 2000-06-20

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed
MKLA Lapsed

Effective date: 20080416