GB2430510B - Improved scrambling - Google Patents

Improved scrambling

Info

Publication number
GB2430510B
GB2430510B GB0519677A GB0519677A GB2430510B GB 2430510 B GB2430510 B GB 2430510B GB 0519677 A GB0519677 A GB 0519677A GB 0519677 A GB0519677 A GB 0519677A GB 2430510 B GB2430510 B GB 2430510B
Authority
GB
United Kingdom
Prior art keywords
scrambler
data
output
scrambled
transmission
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 - Fee Related
Application number
GB0519677A
Other versions
GB2430510A (en
GB0519677D0 (en
Inventor
David Lyon
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.)
Snell Advanced Media Ltd
OL Security LLC
Original Assignee
Snell and Wilcox Ltd
Amstr Investments 5 KG LLC
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 Snell and Wilcox Ltd, Amstr Investments 5 KG LLC filed Critical Snell and Wilcox Ltd
Priority to GB0519677A priority Critical patent/GB2430510B/en
Publication of GB0519677D0 publication Critical patent/GB0519677D0/en
Publication of GB2430510A publication Critical patent/GB2430510A/en
Application granted granted Critical
Publication of GB2430510B publication Critical patent/GB2430510B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
    • H04L25/03866—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using scrambling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
    • H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Power Engineering (AREA)
  • Computer Security & Cryptography (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

The apparatus provides for removal of undesirable data sequences for scrambled data prior to transmission to prevent the scrambled data being the same as timing reference signals. Data input is scrambled by a first scrambler 3 and simultaneously passed to data modifier 13 to be modified and then scrambled by a second scrambler 15. The output from the first scrambler is analysed by analysis module 9 to compare it to forbidden data patterns and the result of this analysis is used by control module 11 to select between the output from the first and second scramblers for transmission. The first scrambler output will normally be used for transmission except where the data output from the first scrambler equals a reserved word, such as synchronising pattern, when the output from the second scrambler will be selected for transmission.
GB0519677A 2005-09-27 2005-09-27 Improved scrambling Expired - Fee Related GB2430510B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0519677A GB2430510B (en) 2005-09-27 2005-09-27 Improved scrambling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0519677A GB2430510B (en) 2005-09-27 2005-09-27 Improved scrambling

Publications (3)

Publication Number Publication Date
GB0519677D0 GB0519677D0 (en) 2005-11-02
GB2430510A GB2430510A (en) 2007-03-28
GB2430510B true GB2430510B (en) 2011-05-25

Family

ID=35335535

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0519677A Expired - Fee Related GB2430510B (en) 2005-09-27 2005-09-27 Improved scrambling

Country Status (1)

Country Link
GB (1) GB2430510B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL199616A0 (en) * 2009-06-28 2010-05-17 Chaim Shen Orr Pattern-free encryption
US10355867B2 (en) 2012-02-15 2019-07-16 Irdeto B.V. Generating fingerprinted content data for provision to receivers

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5333197A (en) * 1990-04-12 1994-07-26 British Telecommunications Public Limited Company System to prevent a scrambler from generating undesired symbols
EP0641130A1 (en) * 1993-08-23 1995-03-01 Matsushita Electric Industrial Co., Ltd. Scramble transmission apparatus and signal processing apparatus
GB2296168A (en) * 1994-12-12 1996-06-19 Grass Valley Group Scrambling system for serial digital video
US6233718B1 (en) * 1998-10-19 2001-05-15 Dolby Laboratories Licensing Corporation Avoiding forbidden data patterns in coded audio data
JP2002359829A (en) * 2001-05-31 2002-12-13 Toshiba Corp System for transmitting serial digital video signal
US20070050805A1 (en) * 2005-08-29 2007-03-01 Sergiu Rotenstein Transmission of pathological data patterns

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5333197A (en) * 1990-04-12 1994-07-26 British Telecommunications Public Limited Company System to prevent a scrambler from generating undesired symbols
EP0641130A1 (en) * 1993-08-23 1995-03-01 Matsushita Electric Industrial Co., Ltd. Scramble transmission apparatus and signal processing apparatus
GB2296168A (en) * 1994-12-12 1996-06-19 Grass Valley Group Scrambling system for serial digital video
US6233718B1 (en) * 1998-10-19 2001-05-15 Dolby Laboratories Licensing Corporation Avoiding forbidden data patterns in coded audio data
JP2002359829A (en) * 2001-05-31 2002-12-13 Toshiba Corp System for transmitting serial digital video signal
US20070050805A1 (en) * 2005-08-29 2007-03-01 Sergiu Rotenstein Transmission of pathological data patterns

Also Published As

Publication number Publication date
GB2430510A (en) 2007-03-28
GB0519677D0 (en) 2005-11-02

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)

Free format text: REGISTERED BETWEEN 20090903 AND 20090909

PCNP Patent ceased through non-payment of renewal fee

Effective date: 20140927