CA2234972A1 - Digitally removing video copy protection pulses - Google Patents

Digitally removing video copy protection pulses

Info

Publication number
CA2234972A1
CA2234972A1 CA002234972A CA2234972A CA2234972A1 CA 2234972 A1 CA2234972 A1 CA 2234972A1 CA 002234972 A CA002234972 A CA 002234972A CA 2234972 A CA2234972 A CA 2234972A CA 2234972 A1 CA2234972 A1 CA 2234972A1
Authority
CA
Canada
Prior art keywords
pulses
copy protection
signal
digital
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.)
Granted
Application number
CA002234972A
Other languages
French (fr)
Other versions
CA2234972C (en
Inventor
Ronald Quan
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.)
Rovi Corp
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2234972A1 publication Critical patent/CA2234972A1/en
Application granted granted Critical
Publication of CA2234972C publication Critical patent/CA2234972C/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04N7/1713—Systems operating in the amplitude domain of the television signal by modifying synchronisation signals
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/02—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components
    • H03K19/173—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using elementary logic circuits as components
    • H03K19/1733—Controllable logic circuits
    • H03K19/1737—Controllable logic circuits using multiplexers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/20—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits characterised by logic function, e.g. AND, OR, NOR, NOT circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K21/00—Details of pulse counters or frequency dividers
    • H03K21/38—Starting, stopping or resetting the counter
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/66—Digital/analogue converters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • 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
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H04N7/087—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H04N7/087—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only
    • H04N7/088—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital
    • 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
    • H04N7/1693—Systems operating in the time domain of the television signal by displacing synchronisation signals relative to active picture signals or vice versa
    • 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
    • H04N2005/91307—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal
    • H04N2005/91314—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal the copy protection signal being a pulse signal inserted in blanking intervals of the video signal, e.g. pseudo-AGC pulses, pseudo-sync pulses
    • 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
    • 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
    • H04N2005/91371—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal the video color burst signal being modified

Abstract

The invention uses digital techniques for defeating the effects of the analog copy protected signal while the signal is in the digital domain. The types of copy protection signals includes pseudo sync pulses and AGC pulses.
Additionally digital techniques may be used for reducing or eliminating the effects of a chroma copy protection process (Figs. 10-14). A digital video copy protection eliminator allows removal of substantially all pseudo sync pulses and/or AGC pulses in the digital domain. The location of pseudo syncs and/or AGC pulses are determined, while the signal is in the digital domain.
These known pixel locations of all or some of the pseudo syncs and/or AGC
pulses are used to digitally modify the signal so as to effectively remove the pseudo sync pulses and/or AGC pulses.
CA002234972A 1995-10-17 1996-10-17 Digitally removing video copy protection pulses Expired - Lifetime CA2234972C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US568195P 1995-10-17 1995-10-17
US60/005,681 1995-10-17
PCT/US1996/016767 WO1997016022A1 (en) 1995-10-17 1996-10-17 Digitally removing video copy protection pulses

Publications (2)

Publication Number Publication Date
CA2234972A1 true CA2234972A1 (en) 1997-05-01
CA2234972C CA2234972C (en) 2001-07-31

Family

ID=21717156

Family Applications (2)

Application Number Title Priority Date Filing Date
CA002234972A Expired - Lifetime CA2234972C (en) 1995-10-17 1996-10-17 Digitally removing video copy protection pulses
CA002234971A Expired - Lifetime CA2234971C (en) 1995-10-17 1996-10-17 Method and apparatus for removing or defeating effects of copy protection signals from a video signal

Family Applications After (1)

Application Number Title Priority Date Filing Date
CA002234971A Expired - Lifetime CA2234971C (en) 1995-10-17 1996-10-17 Method and apparatus for removing or defeating effects of copy protection signals from a video signal

Country Status (12)

Country Link
US (4) US6002830A (en)
EP (4) EP1416730A3 (en)
JP (2) JP4355819B2 (en)
KR (2) KR100474124B1 (en)
CN (2) CN1164113C (en)
AT (2) ATE477678T1 (en)
AU (3) AU700093B2 (en)
CA (2) CA2234972C (en)
DE (2) DE69638231D1 (en)
HK (1) HK1015100A1 (en)
NZ (2) NZ321300A (en)
WO (2) WO1997015142A1 (en)

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Also Published As

Publication number Publication date
JPH11513872A (en) 1999-11-24
AU700093B2 (en) 1998-12-24
AU715473B2 (en) 2000-02-03
EP0856224B1 (en) 2005-12-07
KR100474124B1 (en) 2005-07-18
AU7718396A (en) 1997-05-15
ATE477678T1 (en) 2010-08-15
DE69635555D1 (en) 2006-01-12
JPH11513861A (en) 1999-11-24
NZ321300A (en) 1998-08-26
JP4450434B2 (en) 2010-04-14
JP4355819B2 (en) 2009-11-04
DE69638231D1 (en) 2010-09-23
EP0856224A4 (en) 1998-11-25
EP0890261A1 (en) 1999-01-13
AU700266B2 (en) 1998-12-24
US5953417A (en) 1999-09-14
CA2234971C (en) 2001-08-07
CN1200219A (en) 1998-11-25
CA2234972C (en) 2001-07-31
EP0856224A1 (en) 1998-08-05
CN1200222A (en) 1998-11-25
EP1416730A3 (en) 2010-07-07
US6002830A (en) 1999-12-14
ATE312475T1 (en) 2005-12-15
NZ323128A (en) 1998-09-24
EP0890261A4 (en) 1999-01-13
EP1646234A2 (en) 2006-04-12
CA2234971A1 (en) 1997-04-24
EP1416730A2 (en) 2004-05-06
US6173109B1 (en) 2001-01-09
AU7458096A (en) 1997-05-07
KR19990064352A (en) 1999-07-26
WO1997016022A1 (en) 1997-05-01
CN1164113C (en) 2004-08-25
DE69635555T2 (en) 2006-07-13
HK1015100A1 (en) 1999-10-08
CN1118192C (en) 2003-08-13
EP1646234A3 (en) 2010-11-24
WO1997015142A1 (en) 1997-04-24
AU1428799A (en) 1999-04-01
US6421497B1 (en) 2002-07-16
EP0890261B1 (en) 2010-08-11
KR100489145B1 (en) 2005-09-14
KR19990064292A (en) 1999-07-26

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