KR910002249A - Teletext Receiving Circuit Using Ghost Cancel Function - Google Patents

Teletext Receiving Circuit Using Ghost Cancel Function Download PDF

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Publication number
KR910002249A
KR910002249A KR1019890007646A KR890007646A KR910002249A KR 910002249 A KR910002249 A KR 910002249A KR 1019890007646 A KR1019890007646 A KR 1019890007646A KR 890007646 A KR890007646 A KR 890007646A KR 910002249 A KR910002249 A KR 910002249A
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KR
South Korea
Prior art keywords
signal
ghost
teletext
output signal
error
Prior art date
Application number
KR1019890007646A
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Korean (ko)
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KR920001850B1 (en
Inventor
김철진
Original Assignee
강진구
삼성전자 주식회사
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Application filed by 강진구, 삼성전자 주식회사 filed Critical 강진구
Priority to KR1019890007646A priority Critical patent/KR920001850B1/en
Publication of KR910002249A publication Critical patent/KR910002249A/en
Application granted granted Critical
Publication of KR920001850B1 publication Critical patent/KR920001850B1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/08Systems 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

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)

Abstract

내용 없음No content

Description

고스트 캔슬라기능을 이용한 텔레텍스트 수신회로Teletext Receiving Circuit Using Ghost Cancel Function

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

제2도는 본 발명의 텔렉텍스트 수신기 블럭도.2 is a teletext receiver block diagram of the present invention.

제3도는 제2도중 고스트 캔슬라(30)의 회로도.3 is a circuit diagram of a ghost canceller 30 in FIG.

제4도는 제2도중 고스트 캔슬라 (30)회로의 파형도.4 is a waveform diagram of a ghost cancel circuit 30 in FIG.

Claims (3)

텔레텍스트 수신회로에 있어서, 방송국에서 보내는 RF신호를 받아서 특정채널을 선국하여 중간 주파수로 변환하는 튜너(10)와, 상기 튜너(10)의 출력신호를 검파하여 복합 영상신호를 출력하는 VIF검파부(20)와 상기 VIF검파부(20) 출력신호의 수직귀선 기간에 방송국측에서 송신하는 텔레텍스트 신호와 고스트 캔슬라용 기준신호를 입력하여 고스트 유무를 판별한 후 고스트신호를 제거하는 고스트 캔슬라(30)와, 상기 고스트 캔슬라(30)의 출력신호를 입력하여 컬러신호 복조 및 영상신호를 처리하므로 색차신호 및 영상신호를 출력하는 비디오 및 크로마처리부(40)와, 상기 고스트 캔슬라(30)의 출력신호의 동기기간에 포함된 텔레텍스트 신호를 추출하는 텔레텍스트 추출부(50)와, 상기 텔레텍스트 추출부(50)의 출력신호를 그림 또는 글씨로 표시할 수 있는 신호로 변환하는 텔레텍스트신호 처리부(50)와, 상기 텔레텍스트신호 처리부(60)의 출력신호를 R,G,B원색 신호로 만드는 표시메모리부(70)와, 상기 비디오 및 크로마처리부(40)의 출력신호와 표시메모리부(70)의 출력신호를 중첩하는 혼합부(80)로 구성함을 특징으로 하는 고스트 캔슬라 기능을 이용한 텔레텍스트 수신회로.In the teletext receiving circuit, a tuner 10 that receives an RF signal transmitted from a broadcasting station and tunes a specific channel to an intermediate frequency, and a VIF detector that detects an output signal of the tuner 10 and outputs a composite video signal. (20) and a ghost canceler for inputting a teletext signal and a ghost cancel reference signal transmitted from the broadcasting station in the vertical retrace period of the output signal of the VIF detector 20 to determine whether ghost is present and then removing the ghost signal ( 30) and a video and chroma processor 40 for outputting a color difference signal and a video signal by inputting the output signal of the ghost canceller 30 to process color signal demodulation and video signals, and the ghost canceller 30. Teletext extraction unit 50 for extracting the teletext signal included in the synchronization period of the output signal of the signal and the scene that can display the output signal of the teletext extraction unit 50 in a picture or font Of the teletext signal processing unit 50 for converting to a call, the display memory unit 70 for converting the output signal of the teletext signal processing unit 60 into R, G, and B primary colors signals, and the video and chroma processing unit 40 Teletext receiving circuit using a ghost cancel function, characterized in that the output signal and the mixing unit 80 overlapping the output signal of the display memory unit 70. 제1항에 있어서, 고스트 캔슬라(30)가 탭 계수의 제어에 따라 원신호에 대한 고스트의 지연량과 진폭을 판단하여 고스트가 포함된 복합영상 신호가 기준신호(32)와 일치하게 하여 복합영상 신호를 출력하는 트랜스버설 필터(31)와, 고스트 캔슬라용 기준신호(32)와 트랜스버설 필터(31)의 출력신호를 비교하여 오차신호를 검출하는 오차검출부(33)와, 상기 오차검출부(33)의 오차신호와 고스트가 포함된 복합영상신호를 연산하여 오차신호를 최소로 하는 상기 트랜스버설필터(31)의 탭 계수를 수정하도록 제어하는 연산부(34)로 구성함을 특징으로 하는 고스트 캔슬라 기능을 이용한 텔레텍스트 수신회로.The method according to claim 1, wherein the ghost canceller 30 determines the delay amount and amplitude of the ghost with respect to the original signal under the control of the tap coefficient so that the composite video signal including the ghost matches the reference signal 32. A transversal filter 31 for outputting an image signal, an error detector 33 for detecting an error signal by comparing the output signal of the ghost cancel reference signal 32 and the transversal filter 31, and the error detector ( Ghost cancellation, characterized in that the control unit 34 controls to modify the tap coefficient of the transversal filter 31 which minimizes the error signal by calculating the complex video signal including the error signal and the ghost Teletext receiving circuit using d. 제2항에 있어서, 오차검출부(33)로부터 출력되는 오차신호가 최소가 되도록 트랜스버설 필터(31)의 탭계수를 반복 수정함을 특징으로 하는 고스트 캔슬라기능을 이용한 텔레텍스트 수신회로.3. The teletext receiver circuit according to claim 2, wherein the tap coefficient of the transversal filter (31) is repeatedly modified so that the error signal output from the error detector (33) is minimized. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019890007646A 1989-06-03 1989-06-03 Teletext circuit KR920001850B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019890007646A KR920001850B1 (en) 1989-06-03 1989-06-03 Teletext circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019890007646A KR920001850B1 (en) 1989-06-03 1989-06-03 Teletext circuit

Publications (2)

Publication Number Publication Date
KR910002249A true KR910002249A (en) 1991-01-31
KR920001850B1 KR920001850B1 (en) 1992-03-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019890007646A KR920001850B1 (en) 1989-06-03 1989-06-03 Teletext circuit

Country Status (1)

Country Link
KR (1) KR920001850B1 (en)

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KR920001850B1 (en) 1992-03-05

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