KR970057767A - Jitter absorption and video signal transmission of video data in distribution switch network of optical cable TV system - Google Patents

Jitter absorption and video signal transmission of video data in distribution switch network of optical cable TV system Download PDF

Info

Publication number
KR970057767A
KR970057767A KR1019950053969A KR19950053969A KR970057767A KR 970057767 A KR970057767 A KR 970057767A KR 1019950053969 A KR1019950053969 A KR 1019950053969A KR 19950053969 A KR19950053969 A KR 19950053969A KR 970057767 A KR970057767 A KR 970057767A
Authority
KR
South Korea
Prior art keywords
clock
outputting
phase
nrz
video signal
Prior art date
Application number
KR1019950053969A
Other languages
Korean (ko)
Other versions
KR0176081B1 (en
Inventor
조재일
박승현
윤용섭
강성수
Original Assignee
양승택
한국전자통신연구원
이준
한국전기통신공사
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 양승택, 한국전자통신연구원, 이준, 한국전기통신공사 filed Critical 양승택
Priority to KR1019950053969A priority Critical patent/KR0176081B1/en
Publication of KR970057767A publication Critical patent/KR970057767A/en
Application granted granted Critical
Publication of KR0176081B1 publication Critical patent/KR0176081B1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable
    • H04N7/102—Circuits therefor, e.g. noise reducers, equalisers, amplifiers
    • H04N7/104—Switchers or splitters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M9/00—Parallel/series conversion or vice versa
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0475—Circuits with means for limiting noise, interference or distortion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable
    • H04N7/106—Adaptations for transmission by electrical cable for domestic distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/22—Adaptations for optical transmission

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Theoretical Computer Science (AREA)
  • Optical Communication System (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

본 발명은 광 케이블 티비(CATV) 시스템에서 가입자가 원하는 디지탈 비디오 신호를 분배 스위칭하는 분배 스위치 네트워크의 광 전송 장치를 통해 입력되는 디지탈 비디오 데이타의 위상 지터를 흡수하여 비디오 신호를 송신하는 장치에 관한 것으로서, B3ZS로 선로 부호화되어 광 전송 장치를 통해 입력되는 비디오 신호를 NRZ 형태로 변환하고, 각 비디오 신호에 동기되어 있는 클럭을 추출하여 출력하는 B3ZS 복호 수단(11); 광 CATV 시스템 전체에 사용되는 동기 클럭을 이용하여 기준 클럭을 생성하여 출력하는 클럭 분배 수단(12); 상기 B3ZS 복호 수단(11)에서 NRZ로 변환된 비디오 데이타와 각 비디오 데이타에 동기된 추출 클럭 및 상기 클럭 분배 수단(12)에서 입력되는 기준 클럭을 이용하여 서로 위상 특성이 상이한 NRZ 비디오 데이타를 하나의 기준 클럭에 위상 정렬시켜 출력하는 위상 정렬 수단(13); 상기 위상 정렬 수단(13)의 하나의 기준 클럭에 위상 정렬되어 출력된 NRZ 비디오 데이타를 입력받아 출력하는 비디오 신호 송신 수단(14); 및 입력되는 B3ZS 비디오 신호의 유무를 검출하여 에러 발생시 에러 신호(FAULT)를 출력하는 경보 처리 수단(15)을 구비하여 광 전송 장치를 통해 분배 스위치 네트워크로 입력되는 비디오 데이타의 지터를 흡수할 수 있기 때문에 가입자로 분배 전송되는 디지탈 비디오 신호의 손실을 제거할 수 있는 효과가 있다.The present invention relates to an apparatus for transmitting a video signal by absorbing phase jitter of digital video data input through an optical transmission device of a distribution switch network that distributes and switches a subscriber's desired digital video signal in an optical cable TV system. A B3ZS decoding means (11) for converting the video signal inputted through the optical transmission device into an NRZ form by line coding with B3ZS, and extracting and outputting a clock synchronized with each video signal; Clock distributing means (12) for generating and outputting a reference clock using a synchronous clock used for the entire optical CATV system; The B3ZS decoding means 11 uses NRZ video data converted to NRZ, an extraction clock synchronized with each video data, and a reference clock inputted from the clock distribution means 12 to generate NRZ video data having different phase characteristics from each other. Phase alignment means (13) for phase-aligning and outputting the reference clock; Video signal transmission means (14) for receiving and outputting NRZ video data that is phase-aligned and output to one reference clock of the phase aligning means (13); And alarm processing means (15) for detecting the presence or absence of an input B3ZS video signal and outputting an error signal (FAULT) when an error occurs to absorb jitter of video data input to the distribution switch network through the optical transmission device. Therefore, there is an effect that can eliminate the loss of the digital video signal distributed to the subscriber.

Description

광 케이블 티비(CATV) 시스템의 분배 스위치 망에서 비디오 데이타의 지터 흡수 및 비디오 신호 송신 장치Jitter absorption and video signal transmission of video data in distribution switch network of optical cable TV system

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

제1도는 본 발명이 적용되는 광 CATV 시스템의 블럭 구성도.1 is a block diagram of an optical CATV system to which the present invention is applied.

제2도는 본 발명이 적용되는 분배 스위치 네트워크의 블럭 구성도.2 is a block diagram of a distributed switch network to which the present invention is applied.

제3도는 본 발명에 따른 지터 흡수 및 비디오 신호 송신 장치의 일실시예 블럭 구성도.3 is a block diagram of an embodiment of a jitter absorption and video signal transmission apparatus according to the present invention.

Claims (2)

B3ZS로 선로 부호화되어 광 전송 장치를 통해 입력되는 비디오 신호를 NRZ 형태로 변환하고, 각 비디오 신호에 동기되어 있는 클럭을 추출하여 출력하는 B3ZS 복호 수단(11); 광 CATV 시스템 전체에 사용되는 동기 클럭을 이용하여 기준 클럭을 생성하여 출력하는 클럭 분배 수단(12); 상기 B3ZS 복호 수단(11)에서 NRZ로 변환된 비디오 데이타와 각 비디오 데이타에 동기된 추출 클럭 및 상기 클럭 분배 수단(12)에서 입력되는 기준 클럭을 이용하여 서로 위상 특성이 상이한 NRZ 비디오 데이타를 하나의 기준 클럭에 위상 정렬시켜 출력하는 위상 정렬 수단(13); 상기 위상 정렬 수단(13)의 하나의 기준 클럭에 위상 정렬되어 출력된 NRZ 비디오 데이타를 입력받아 출력하는 비디오 신호 송신 수단(14); 및 입력되는 B3ZS 비디오 신호의 유무를 검출하여 에러 발생시 에러 신호(FAULT)를 출력하는 경보 처리 수단(15)을 구비한 것을 특징으로 하는 지터 흡수 및 비디오 신호 송신 장치.B3ZS decoding means (11) for converting video signals inputted through the optical transmission device into lines in NRZ form by B3ZS, and extracting and outputting a clock synchronized with each video signal; Clock distributing means (12) for generating and outputting a reference clock using a synchronous clock used for the entire optical CATV system; The B3ZS decoding means 11 uses NRZ video data converted to NRZ, an extraction clock synchronized with each video data, and a reference clock inputted from the clock distribution means 12 to generate NRZ video data having different phase characteristics from each other. Phase alignment means (13) for phase-aligning and outputting the reference clock; Video signal transmission means (14) for receiving and outputting NRZ video data that is phase-aligned and output to one reference clock of the phase aligning means (13); And alarm processing means (15) for detecting the presence or absence of an input B3ZS video signal and outputting an error signal (FAULT) when an error occurs. 제1항에 있어서, 상기 위상 정렬 수단(13)은, 상기 B3ZS 복호 수단(11)으로 부터 입력된 NRZ 비디오 직렬 데이타와 추출된 클럭을 입력받아 병렬 데이타로 변환하여 출력하는 직/병렬 변환 수단(100); 상기 B3ZS 복호 수단(11)으로 부터 추출된 클럭을 입력받고, 상기 클럭 분배 수단(12)으로 부터 기준 클럭을 입력받아 위상 신호를 검출하여 제어 신호를 생성하여 출력하는 위상 신호 검출 및 제어 신호 생성 수단(101); 상기 직/병렬 변환 수단(100)의 병렬 데이타를 상기 위상 신호 검출 및 제어 신호 생성 수단(101)의 제어 신호에 의해 래치하여 출력하는 래치 수단(102); 및 상기 래치 수단(102)의 출력을 입력받아 상기 클럭 분배 수단(12)의 기준 클럭에 동기시켜 직렬 데이타로 변환하여 상기 비디오 신호 송신 수단(14)으로 출력하는 병/직렬 변환 수단(103)을 구비한 것을 특징으로 하는 지터 흡수 및 비디오 신호 송신 장치.The apparatus of claim 1, wherein the phase aligning means (13) comprises: serial / parallel converting means for receiving the NRZ video serial data inputted from the B3ZS decoding means (11) and the extracted clock, converting them into parallel data, and outputting the parallel data; 100); Phase signal detection and control signal generation means for receiving a clock extracted from the B3ZS decoding means 11, receiving a reference clock from the clock distribution means 12, detecting a phase signal, and generating and outputting a control signal. 101; Latch means (102) for latching and outputting parallel data of the serial / parallel conversion means (100) by the control signal of the phase signal detection and control signal generation means (101); And parallel / serial conversion means 103 which receives the output of the latch means 102 and converts it into serial data in synchronization with the reference clock of the clock distribution means 12 and outputs it to the video signal transmission means 14. Jitter absorption and video signal transmission device, characterized in that provided. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950053969A 1995-12-22 1995-12-22 Apparatus for absorbing the jiter of a video data and transmitting a video signal in distributive switching network of an optic cable television KR0176081B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950053969A KR0176081B1 (en) 1995-12-22 1995-12-22 Apparatus for absorbing the jiter of a video data and transmitting a video signal in distributive switching network of an optic cable television

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950053969A KR0176081B1 (en) 1995-12-22 1995-12-22 Apparatus for absorbing the jiter of a video data and transmitting a video signal in distributive switching network of an optic cable television

Publications (2)

Publication Number Publication Date
KR970057767A true KR970057767A (en) 1997-07-31
KR0176081B1 KR0176081B1 (en) 1999-05-01

Family

ID=19442808

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019950053969A KR0176081B1 (en) 1995-12-22 1995-12-22 Apparatus for absorbing the jiter of a video data and transmitting a video signal in distributive switching network of an optic cable television

Country Status (1)

Country Link
KR (1) KR0176081B1 (en)

Also Published As

Publication number Publication date
KR0176081B1 (en) 1999-05-01

Similar Documents

Publication Publication Date Title
US5426644A (en) Parallel code transmission method and apparatus of the same
EP0214261B1 (en) Signal generation
EP0512008B1 (en) Passive optical network
NO961234L (en) Optical telecommunication method for providing a transmitting and receiving service channel
EP0232043A2 (en) Scrambling data signals
KR970057767A (en) Jitter absorption and video signal transmission of video data in distribution switch network of optical cable TV system
US3436471A (en) Multichannel television transmission system utilizing the blanking intervals of transmitted television signals as time slots to accommodate additional television signals
JP2007201842A (en) Pon system
US7729615B1 (en) Method for transmitting overhead information for wavelength division multiplex networks for fibre-optic information transmission
KR900702716A (en) TV receiver
KR930008173B1 (en) Reverse multiplexing apparatus of catv
KR970056144A (en) Adaptive Clock Recovery Unit Supporting Multiple Bit Rates
JPH0556025A (en) Transmission line code processing system
JPH02142231A (en) Jitterless optical transmitting system
KR950005614B1 (en) Optical cable tv apparatus
KR970068672A (en) 1.2G optical transmission apparatus and method using 155M data switching
KR960028541A (en) Subscriber alarm information transmission device
KR950004499Y1 (en) Remoting loop back circuit of synchronous optical fiber multi plexing device
KR0185855B1 (en) A device for transmitting and receiving voice signal and digital data by telephone channel
KR940013209A (en) Multiple / Demultiplex Circuit of Subscriber Access / Terminal in Optical Cable Television (CATV) Network
KR960013078A (en) Optical cable T.V. Synchronization and clock generator for clock switching in distribution center of CATV network
JPH08154084A (en) Digital transmitting and receiving method and device therefor
JP2864703B2 (en) Redundant optical transmission path
Takahashi et al. Experimental adaptive digital multiplexer for fiber optic generation using digital run-length modulation technology
KR950016339A (en) Stereo Audio Broadcasting System for Optical Cable Television

Legal Events

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

Payment date: 20091109

Year of fee payment: 12

LAPS Lapse due to unpaid annual fee