KR950007549A - Caption decoder control method of scrambled video signal - Google Patents

Caption decoder control method of scrambled video signal Download PDF

Info

Publication number
KR950007549A
KR950007549A KR1019930015884A KR930015884A KR950007549A KR 950007549 A KR950007549 A KR 950007549A KR 1019930015884 A KR1019930015884 A KR 1019930015884A KR 930015884 A KR930015884 A KR 930015884A KR 950007549 A KR950007549 A KR 950007549A
Authority
KR
South Korea
Prior art keywords
video signal
caption
parity bit
scrambled
parity
Prior art date
Application number
KR1019930015884A
Other languages
Korean (ko)
Other versions
KR950012669B1 (en
Inventor
김성수
Original Assignee
이헌조
주식회사 금성사
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 이헌조, 주식회사 금성사 filed Critical 이헌조
Priority to KR1019930015884A priority Critical patent/KR950012669B1/en
Publication of KR950007549A publication Critical patent/KR950007549A/en
Application granted granted Critical
Publication of KR950012669B1 publication Critical patent/KR950012669B1/en

Links

Classifications

    • 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]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream decryption

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

본 발명은 유료 텔레비젼 방송 시스템등에서, 스크램블되어 수신되는 영상신호에 실려있는 캡션 데이터의 패리티 비트 데이터를 검색하여 현재 입력되는 영상신호가 스크램블 영상신호인가 또는 일반 영상신호인가를 판단하고, 이 판단 결과에 따라 캡션 디코더에서 이루어지는 패리티 검색동작의 실행 여부를 제어하므로서 영상신호 재현에 신뢰를 확보할 수 있도록 한 스크램블 영상신호의 캡션 디코더 제어 방법에 관한 것이다.According to the present invention, in a pay TV broadcasting system, the parity bit data of the caption data contained in the scrambled and received video signal is searched to determine whether the currently input video signal is a scrambled video signal or a general video signal. Accordingly, the present invention relates to a method of controlling a caption decoder of a scrambled video signal, by which a parity search operation performed in a caption decoder is performed to ensure reliability in reproducing the video signal.

종래의 스크램블 시스템에서, 가입자측의디스크램블러에서 복조된 영상신호에 존재하는 스크램블 바아(BAR)의 영향으로 패리티 비트(P2)가 손상되고, 이로 인하여 패리티 비트(P2)가 항상 로직 '1'로 되므로 수신된 캡션 데이터의 홀수 패리티 검색을 수행하면 확률상 50%의 오차가 발생되고 캡션 데이터의 1/2의 에러로 처리되므로 캡션 영상의 시청 자체가 불가능해 지게되는 문제점이 있다.In the conventional scramble system, the parity bit P2 is damaged due to the scramble bar BAR present in the demodulated video signal in the subscriber-side descrambler, so that the parity bit P2 is always set to logic '1'. Therefore, when the odd parity search of the received caption data is performed, an error of 50% is generated in probability and is treated as an error of 1/2 of the caption data, thereby making it impossible to view the caption image itself.

본 발명은 가입자측에서 수신된 영상신호의 캡션 데이터의 패리티 비트(P2)를 검색하여 이 패리티 비트(P2)가 설정된 횟수 이상 연속하여 로직 '1'을 유지하면 현재 수신된 영상신호가 스크램블된 영상신호이고 스크램블 바아(BAR)에 의하여 패리티 비트(P2)가 손상되고 있는 경우로 판별하여 이 경우에는 캡션 데이터의 패리티 검색을 실행하지 않도록 제어하므로서 정상적인 캡션 데이터를 에러로 처리하는 오류를 방지하고, 이에 따른 캡션 디코더의 동작 신뢰성을 확보할 수 있도록 한 스크램블 영상신호의 캡션 디코더 제어 방법이다.According to the present invention, if the parity bit (P2) of the caption data of the video signal received at the subscriber side is searched and the logic parity bit (P2) is maintained more than the set number of times continuously, the current received video signal is scrambled. The signal is determined to be a case where the parity bit P2 is damaged by the scramble bar BAR, and in this case, the parity search of the caption data is not executed, thereby preventing an error of processing normal caption data as an error. The caption decoder control method of the scrambled video signal to ensure the operation reliability of the caption decoder according to the present invention.

Description

스크램블 영상신호의 캡션 디코더 제어 방법Caption decoder control method of scrambled video signal

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제3도는 본 발명의 캡션 디코더 제어방법의 플로우차트.3 is a flowchart of a caption decoder control method of the present invention.

Claims (1)

디코드된 캡션 데이터의 제2바이트(B2) 패리티 비트(P2)의 로직을 검색하는 제1단계와, 상기 제1단계의 로직 검색 결과 패리티 비트(P2)가 연속하여 로직 '1'인 개수 및 연속하여 로직 '0'인 개수를 카운트하여 각각 스크램블 판단 기준값 및 일반 영상신호 판단 기준값과 비교하는 제2단계와, 상기 제2단계의 비교 결과 패리티 비트(P2)의 로직 '1'인 개수가 스크램블 판단 기준값이면 현재 입력되는 영상신호가 스크램블되어 전송되어 온 신호로 판별하고 캡션 데이터의 패리티 검색을 싱행하지 않는 제3단계와, 상기 제2단계의 비교 결과 패리티 비트(P2)의 로직 '0'인 개수가 일반 영상신호 판단 기준값이면 현재 입력되는 영상신호가 스크램블되지 않은 영상신호로 판별하고 캡션 데이터의 패리티 검색을 실행하는 제4단계로 이루어진 스크램블 영상신호의 캡션 디코더 제어방법.A first step of searching logic of the parity bit P2 of the second byte B2 of the decoded caption data, and the number and continuation of the logic search result parity bit P2 of the first step being logic '1' The second step of counting the number of logic '0' and comparing it with the scramble determination reference value and the general video signal determination reference value, and the number of logic '1' of the parity bit (P2) of the comparison result of the second step is scrambled determination When the reference value is a reference value, the current input signal is determined as a scrambled and transmitted signal, and the third step of not performing parity search of caption data and the number of logic '0' of the parity bit P2 as a result of the comparison of the second step. Is a standard video signal determination reference value, the caption of the scrambled video signal comprising the fourth step of discriminating the currently input video signal as an unscrambled video signal and executing a parity search of the caption data. Decoder control method. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930015884A 1993-08-17 1993-08-17 Control method of caption decoder of scrambled image signal KR950012669B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019930015884A KR950012669B1 (en) 1993-08-17 1993-08-17 Control method of caption decoder of scrambled image signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019930015884A KR950012669B1 (en) 1993-08-17 1993-08-17 Control method of caption decoder of scrambled image signal

Publications (2)

Publication Number Publication Date
KR950007549A true KR950007549A (en) 1995-03-21
KR950012669B1 KR950012669B1 (en) 1995-10-19

Family

ID=19361370

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019930015884A KR950012669B1 (en) 1993-08-17 1993-08-17 Control method of caption decoder of scrambled image signal

Country Status (1)

Country Link
KR (1) KR950012669B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100386080B1 (en) * 1996-09-16 2003-08-21 주식회사 하이닉스반도체 Apparatus for compensating gamma of video signals
KR102661181B1 (en) * 2023-11-30 2024-04-26 주식회사 티에스산업 H-beam process automation device and system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100386080B1 (en) * 1996-09-16 2003-08-21 주식회사 하이닉스반도체 Apparatus for compensating gamma of video signals
KR102661181B1 (en) * 2023-11-30 2024-04-26 주식회사 티에스산업 H-beam process automation device and system

Also Published As

Publication number Publication date
KR950012669B1 (en) 1995-10-19

Similar Documents

Publication Publication Date Title
US5912696A (en) Multidimensional rating system for media content
US7707485B2 (en) System and method for dynamic transrating based on content
US20040006767A1 (en) System, method, and computer program product for selective filtering of objectionable content from a program
US20040049780A1 (en) System, method, and computer program product for selective replacement of objectionable program content with less-objectionable content
US20020147782A1 (en) System for parental control in video programs based on multimedia content information
KR20040004355A (en) Television access control system
US20110093882A1 (en) Parental control through the HDMI interface
KR19990071555A (en) METHOD AND APPARATUS FOR DISABLING VOICE OR VIDEO DISPLAY
US4663659A (en) Video signal scrambling system employing full line reversal and double burst coding
KR960020502A (en) 180 ° Phase Error Compensator for High Definition Television GE Systems
KR950007549A (en) Caption decoder control method of scrambled video signal
JPH10164522A (en) Data-processing method inside teletext page, and decoder
US6698019B1 (en) Apparatus and method for controlling viewing of video signals
US20070132851A1 (en) Sync-threshold adjust
EP0706741B1 (en) Auxiliary video information code correction in sync-suppression type scrambled video signals
US20090116816A1 (en) Chaptering method and apparatus for movie data
US20040057545A1 (en) Data reading method, data reading apparatus, and data reading program
JPS5824282A (en) Control signal transmission system
US8374491B2 (en) Methods for reading watermarks in unknown data types, and DVD drives with such functionality
Yu et al. An improved structure of pre-determined parental viewing control data in software design for ATSC receiver
KR970023293A (en) How to Preset Video Plus Channels with One Page Teletext
WO1998036570A1 (en) Television
TH21891EX (en) "The machine successfully decrypts the data in the rental system. TV signal reception "
KR960016147B1 (en) Television program restricting method
KR100287864B1 (en) Learning caption TV and its control method

Legal Events

Date Code Title Description
A201 Request for examination
G160 Decision to publish patent application
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20070918

Year of fee payment: 13

LAPS Lapse due to unpaid annual fee