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KR970056929A - How to remove ghost of on-board video receiver - Google Patents

How to remove ghost of on-board video receiver Download PDF

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Publication number
KR970056929A
KR970056929A KR1019950058740A KR19950058740A KR970056929A KR 970056929 A KR970056929 A KR 970056929A KR 1019950058740 A KR1019950058740 A KR 1019950058740A KR 19950058740 A KR19950058740 A KR 19950058740A KR 970056929 A KR970056929 A KR 970056929A
Authority
KR
South Korea
Prior art keywords
ghost
signal
gcr
reference signal
filter coefficients
Prior art date
Application number
KR1019950058740A
Other languages
Korean (ko)
Inventor
박형모
Original Assignee
구자홍
Lg 전자주식회사
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 구자홍, Lg 전자주식회사 filed Critical 구자홍
Priority to KR1019950058740A priority Critical patent/KR970056929A/en
Priority to CN96114080A priority patent/CN1158533A/en
Publication of KR970056929A publication Critical patent/KR970056929A/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
    • H04N5/211—Ghost signal cancellation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/57—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for mobile receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/52—Automatic gain control
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H2017/0072—Theoretical filter design
    • H03H2017/009—Theoretical filter design of IIR filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H2218/00—Indexing scheme relating to details of digital filters
    • H03H2218/02—Coefficients

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Noise Elimination (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)

Abstract

본 발명은 차량에 탑재된 영상신호 수신기의 고스트신호 제거기술에 관한 것으로 종래의 고스트제거 방법에 있어서는 단지 차량이 정지된 상태에서만 고스트신호를 제거할 수 있게 되어 있어 이동상태에서 보다 양질의 화상을 제공할 수 없는 결함이 있을 뿐더러 별도의 차량센서를 사용하게 되어 있어 공간을 많이 차지하고 원가가 상승되는 결함이 있었는 바, 본 발명은 이를 해결하기 위하여, 중간주파수단에서 공급되는 자동이득제어신호(AGC)를 근거로 차량의 정지/이동상태를 판단하여 고스트제거기준신호(GCR)를 근거로 필터계수를 구하고, 이렇게 구한 필터계수들의 평균값을 취하여 로딩하는 슬로오모드에서의 고스트제거과정과, 고스트제거기준신호(GCR)와 인가되는 왜곡된 고스트제거기준신호의 상호상관값을 이용하여 채널의 응답특성을 추정하고, 이로부터 필터계수를 구하는 패스트모드에서 고스트제거과정을 통해 고스트를 제거하도록 하였다.The present invention relates to a ghost signal removal technology of a video signal receiver mounted on a vehicle. In the conventional ghost removal method, the ghost signal can be removed only when the vehicle is stopped, thereby providing a better image in a moving state. In addition, there is a defect that can not only be used as a separate vehicle sensor and occupies a lot of space and the cost is increased, the present invention to solve this problem, the automatic gain control signal (AGC) supplied from the intermediate frequency stage Determination of the filter coefficients based on the ghost removal reference signal (GCR) by determining the vehicle stop / move state based on the ghost removal process in the slow mode, and the ghost removal criteria The response characteristics of the channel are extracted by using the cross-correlation value of the signal GCR and the distorted ghost cancellation reference signal. , Which was to eliminate the ghost through ghost removal process in a fast mode to obtain the filter coefficients therefrom.

Description

차량 탑재형 영상수신기의 고스트 제거방법How to remove ghost of on-board video receiver

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

제3도는 본 발명의 고스트 제거방법이 적용되는 차량 탑재형 영상수신기의 블록도,이다.3 is a block diagram of an on-board video receiver to which the ghost removal method of the present invention is applied.

제4도는 본 발명에 의한 슬로우모드에서의 고스트제거방법에 대한 신호 흐름도,4 is a signal flow diagram for a ghost removal method in a slow mode according to the present invention;

제5도는 본 발명에 의한 패스트모드에서의 고스트제거방법에 대한 신호 흐름도.5 is a signal flowchart of a ghost cancellation method in a fast mode according to the present invention.

Claims (3)

중간주파수단에서 공급되는 자동이득제어신호(AGC)를 근거로 차량의 정지/이동상태를 판단하여 고스트제거를 위한 슬로우모드와 패스트모드를 설정하는 움직임 판별과정과, 고스트제기준신호(GCR)를 근거로 필터계수를 구하고, 이렇게 구한 필터계수들의 평균갑을 취하여 로딩하는 슬로오모드에서의 고스트제거과정과, 고스트제거기준신호(GCR)와 인가되는 왜곡된 고스트제거기준신호의 상호상관값을 이용하여 채널의 응답특성을 추정하고, 이로부터 필터계수를 구하는 패스트모드에서 고스트제거과정으로 이루어지는 것을 특징으로 하는 차량 탑재형 영상수신기의 고스트 제거방법.Based on the automatic gain control signal (AGC) supplied from the intermediate frequency stage, the vehicle's stop / movement state is judged, and the motion discrimination process for setting the slow mode and the fast mode for ghost elimination, and the ghost control reference signal (GCR) are performed. Based on the ghost elimination process in the slow mode that obtains the filter coefficients based on the filter coefficients and loads the average value of the filter coefficients, the cross correlation value between the ghost elimination reference signal (GCR) and the distorted ghost elimination reference signal is applied. And a ghost elimination process in a fast mode estimating a response characteristic of a channel and obtaining a filter coefficient therefrom. 제1항에 있어서 로우모드에서의 고스트제거과정은 고스트제거기준신호(GCR)를 포착하여 필터계수를 구하는 단계와, 상기 단계에서 구해진 필터계수와 그전의 필터계수의 평균치를 구하여 로딩하는 단계로 이루어지는 것을 특징으로 하는 차량탑재형 영상수신기의 고스트 제거방법.The ghost elimination process in the low mode comprises: acquiring a ghost elimination reference signal (GCR) to obtain a filter coefficient; and obtaining and loading an average value of the filter coefficient obtained in the step and the previous filter coefficient. Ghost removal method of a vehicle-mounted image receiver characterized in that. 제1항에 있어서, 패스트모드에서의 고스트 제거과정은 고스트 제거기준신호 (GCR)와 인고대는 왜곡된 고스트 제거기준신호(GCR)의 상호 상관 값을 로딩하는 단계와 이득을 검출하는단계와, 일정치 이상의 이득을 갖는 신호만을 고스트 신호로 인식하고 그 주변의 포인트들을 소정 범위만큼 윈도윙하는 방식으로 IIR 필터계수를 구하여 로딩하는 단계로 이루어지는 것을 특징으로 하는 차량 탑재형 영상수신기의 고스트 제거방법2. The method of claim 1, wherein the ghost removal process in the fast mode comprises the steps of loading a cross-correlation value of the ghost removal reference signal (GCR) and the anti-ghost distortion signal (GCR) and detecting gain; Recognizing only the signal having a stationary gain as a ghost signal and obtaining the IIR filter coefficients by windowing the points around the predetermined range by a predetermined range, the ghost removal method of the on-board image receiver comprising the ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950058740A 1995-12-27 1995-12-27 How to remove ghost of on-board video receiver KR970056929A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1019950058740A KR970056929A (en) 1995-12-27 1995-12-27 How to remove ghost of on-board video receiver
CN96114080A CN1158533A (en) 1995-12-27 1996-12-25 Ghost eliminating apparatus for mobile image display device and method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950058740A KR970056929A (en) 1995-12-27 1995-12-27 How to remove ghost of on-board video receiver

Publications (1)

Publication Number Publication Date
KR970056929A true KR970056929A (en) 1997-07-31

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Application Number Title Priority Date Filing Date
KR1019950058740A KR970056929A (en) 1995-12-27 1995-12-27 How to remove ghost of on-board video receiver

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KR (1) KR970056929A (en)
CN (1) CN1158533A (en)

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* Cited by examiner, † Cited by third party
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CN102860557B (en) * 2011-07-07 2015-12-02 雀巢公司 Instant granular solid beverage

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Publication number Publication date
CN1158533A (en) 1997-09-03

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