CA2156926A1 - Auxiliary Video Information Code Correction in Sync-Suppression Type Scrambled Video Signals - Google Patents

Auxiliary Video Information Code Correction in Sync-Suppression Type Scrambled Video Signals

Info

Publication number
CA2156926A1
CA2156926A1 CA2156926A CA2156926A CA2156926A1 CA 2156926 A1 CA2156926 A1 CA 2156926A1 CA 2156926 A CA2156926 A CA 2156926A CA 2156926 A CA2156926 A CA 2156926A CA 2156926 A1 CA2156926 A1 CA 2156926A1
Authority
CA
Canada
Prior art keywords
parity errors
sync
character
information code
code correction
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
CA2156926A
Other languages
French (fr)
Other versions
CA2156926C (en
Inventor
Juri Tults
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.)
Technicolor USA Inc
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 CA2156926A1 publication Critical patent/CA2156926A1/en
Application granted granted Critical
Publication of CA2156926C publication Critical patent/CA2156926C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/16Analogue secrecy systems; Analogue subscription systems
    • H04N7/167Systems rendering the television signal unintelligible and subsequently intelligible
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/025Systems for the transmission of digital non-picture data, e.g. of text during the active part of a television frame
    • H04N7/035Circuits for the digital non-picture data signal, e.g. for slicing of the data signal, for regeneration of the data-clock signal, for error detection or correction of the data signal
    • H04N7/0357Circuits for the digital non-picture data signal, e.g. for slicing of the data signal, for regeneration of the data-clock signal, for error detection or correction of the data signal for error detection or correction
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/16Analogue secrecy systems; Analogue subscription systems
    • H04N7/167Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/171Systems operating in the amplitude domain of the television signal
    • H04N7/1713Systems operating in the amplitude domain of the television signal by modifying synchronisation signals

Abstract

A system for processing auxiliary video information, such as closed caption information, includes capability for detecting invalid parity errors that may be created by video signal distortion effects caused by sync suppression video signal scrambling. The sync suppression distortion does not affect the video display but may modify the parity bit of the second of two closed caption characters in each occurrence of line 21 of field 1 causing invalid parity errors. Parity errors in the first character, which is unaffected by the sync suppression distortion, indicate whether valid parity errors exist in the second character. If no parity errors occur in the first character, parity errors that occur in the second character are considered to be invalid.
CA002156926A 1993-04-15 1994-02-25 Auxiliary video information code correction in sync-suppression type scrambled video signals Expired - Fee Related CA2156926C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US048,159 1993-04-15
US08/048,159 US5374960A (en) 1993-04-15 1993-04-15 Auxiliary video information code correction in sync-suppression type scrambled video signals
PCT/US1994/001833 WO1994024819A1 (en) 1993-04-15 1994-02-25 Auxiliary video information code correction in sync-suppression type scrambled video signals

Publications (2)

Publication Number Publication Date
CA2156926A1 true CA2156926A1 (en) 1994-10-27
CA2156926C CA2156926C (en) 1999-04-27

Family

ID=21953042

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002156926A Expired - Fee Related CA2156926C (en) 1993-04-15 1994-02-25 Auxiliary video information code correction in sync-suppression type scrambled video signals

Country Status (10)

Country Link
US (1) US5374960A (en)
EP (1) EP0706741B1 (en)
JP (1) JP3488460B2 (en)
KR (1) KR100328323B1 (en)
CN (1) CN1058359C (en)
CA (1) CA2156926C (en)
DE (1) DE69411009T2 (en)
ES (1) ES2117262T3 (en)
SG (1) SG83628A1 (en)
WO (1) WO1994024819A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1192602C (en) * 1996-05-03 2005-03-09 三星电子株式会社 Viewer selecting type captions playing and receiving method and equipment adatpted for syllabic language
CN1178478C (en) * 1996-05-03 2004-12-01 三星电子株式会社 Viewer selecting type captions broadcasting and receiving method and equipment adapted for syllabic language
EP1753149B1 (en) * 1998-01-29 2013-03-13 Magellan Technology Pty. Limited Methods and devices for the suppression of harmonics
US20100091187A1 (en) * 2008-10-15 2010-04-15 Echostar Technologies L.L.C. Method and audio/video device for processing caption information
CN106331767B (en) * 2016-09-09 2020-03-17 腾讯科技(深圳)有限公司 Data error correction processing method, terminal, server and system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7903340A (en) * 1979-04-27 1980-10-29 Philips Nv ERROR CORRECTION CIRCUIT FOR AN IMAGE AND / OR TEXT RECEIVER.
FR2462073A1 (en) * 1979-07-17 1981-02-06 Thomson Csf METHOD AND DEVICE FOR THE EXTRACTION OF DIGITAL DATA IN THE PRESENCE OF NOISE AND DISTORTIONS
US4470065A (en) * 1982-03-25 1984-09-04 Rca Corporation Adaptive error concealment using horizontal information determination from adjacent lines
JPH04286297A (en) * 1991-03-14 1992-10-12 Nec Corp Transmission line erroe detecting and compensating circuit of color television signal
GB9209147D0 (en) * 1992-04-28 1992-06-10 Thomson Consumer Electronics Auxiliary video information system including extended data services

Also Published As

Publication number Publication date
EP0706741A1 (en) 1996-04-17
ES2117262T3 (en) 1998-08-01
DE69411009T2 (en) 1998-10-15
CA2156926C (en) 1999-04-27
WO1994024819A1 (en) 1994-10-27
CN1120880A (en) 1996-04-17
SG83628A1 (en) 2001-10-16
EP0706741B1 (en) 1998-06-10
DE69411009D1 (en) 1998-07-16
JPH08509109A (en) 1996-09-24
JP3488460B2 (en) 2004-01-19
CN1058359C (en) 2000-11-08
US5374960A (en) 1994-12-20
KR960702246A (en) 1996-03-28
KR100328323B1 (en) 2002-07-03

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed
MKLA Lapsed

Effective date: 20100225