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 SignalsInfo
- 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
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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/025—Systems for the transmission of digital non-picture data, e.g. of text during the active part of a television frame
- H04N7/035—Circuits 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
- H04N7/0357—Circuits 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
-
- 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
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.
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)
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)
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 |
-
1993
- 1993-04-15 US US08/048,159 patent/US5374960A/en not_active Expired - Lifetime
-
1994
- 1994-02-25 WO PCT/US1994/001833 patent/WO1994024819A1/en active IP Right Grant
- 1994-02-25 CN CN94191764A patent/CN1058359C/en not_active Expired - Fee Related
- 1994-02-25 DE DE69411009T patent/DE69411009T2/en not_active Expired - Lifetime
- 1994-02-25 JP JP52313994A patent/JP3488460B2/en not_active Expired - Fee Related
- 1994-02-25 ES ES94909729T patent/ES2117262T3/en not_active Expired - Lifetime
- 1994-02-25 SG SG9602299A patent/SG83628A1/en unknown
- 1994-02-25 EP EP94909729A patent/EP0706741B1/en not_active Expired - Lifetime
- 1994-02-25 CA CA002156926A patent/CA2156926C/en not_active Expired - Fee Related
- 1994-02-25 KR KR1019950704469A patent/KR100328323B1/en not_active IP Right Cessation
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 |