KR960016407A - Calculation method of ghost filter - Google Patents

Calculation method of ghost filter Download PDF

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Publication number
KR960016407A
KR960016407A KR1019940028279A KR19940028279A KR960016407A KR 960016407 A KR960016407 A KR 960016407A KR 1019940028279 A KR1019940028279 A KR 1019940028279A KR 19940028279 A KR19940028279 A KR 19940028279A KR 960016407 A KR960016407 A KR 960016407A
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KR
South Korea
Prior art keywords
value
filter coefficient
maximum value
maximum
minimum
Prior art date
Application number
KR1019940028279A
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Korean (ko)
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KR0134269B1 (en
Inventor
서창원
Original Assignee
배순훈
대우전자 주식회사
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Application filed by 배순훈, 대우전자 주식회사 filed Critical 배순훈
Priority to KR1019940028279A priority Critical patent/KR0134269B1/en
Publication of KR960016407A publication Critical patent/KR960016407A/en
Application granted granted Critical
Publication of KR0134269B1 publication Critical patent/KR0134269B1/en

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    • 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
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H2017/0072—Theoretical filter design
    • H03H2017/0081—Theoretical filter design of FIR filters
    • 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

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

Abstract

본 발명은 고스트 제거장치의 필터계수 계산방법에 관한 것으로, 고스트의 위치를 알아내고 고스트가 존재하는 구간에서만 LMS를 수행하여 계산된 필터계수의 최대값과 최소값의 차이가 설정된 소정수치보다 작으면, 최대값과 최소값의 크기를 비교한다. 최대값이 큰 경우, 최대값이 설정된 소정수치의 2배보다 작고 최대값 바로 다음으로 큰값의 2배보다 작으면 필터계수를 “0”으로 하고, 최소값이 큰 경우, 최소값이 설정된 소정수치의 2배보다 작고 최소값 바로 다음으로 작은값의 2배보다 작으면 필터계수를 “0”으로 함으로써, 잘못 구해진 필터계수를 제거하여 고스트 제거 기능을 향상시키고 잘못 구해진 필터계수로 인한 화질저하를 방지할 수 있도록 한 것이다.The present invention relates to a method for calculating a filter coefficient of a ghost elimination apparatus, wherein the difference between the maximum value and the minimum value of the filter coefficient calculated by determining the position of the ghost and performing LMS only in a section in which the ghost is present is smaller than a predetermined value. Compare the magnitudes of the maximum and minimum values. If the maximum value is large, the filter coefficient is set to "0" if the maximum value is less than twice the predetermined value and less than two times the maximum value immediately after the maximum value. If the minimum value is large, the minimum value is two times the predetermined value. If less than 2 times and less than 2 times smaller than the minimum value, the filter coefficient is set to "0" to remove the erroneously calculated filter coefficients to improve the ghost elimination function and to prevent deterioration of image quality due to the incorrectly calculated filter coefficients. It is.

Description

고스트 제거장치의 필터계수 개선방법How to improve filter coefficient of ghost eliminator

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제3도는 본 발명에 따른 필터계수 계산방법의 흐름을 도시한 플로우챠트,3 is a flow chart showing the flow of the filter coefficient calculation method according to the present invention,

제4도의 (a)는 일예로서 롱고스트의 존재위치를 도시한 파형도이고, (b)는 (a)에서 발생된 롱고스트를 제거하기 위한 필터계수와 잘못 구해진 필터계수를 도시한 파형도.(A) of FIG. 4 is a waveform diagram showing the presence position of a long ghost as an example, and (b) is a waveform diagram showing a filter coefficient and an incorrectly obtained filter coefficient for removing the long ghost generated in (a).

Claims (1)

전송로와 수신측간의 채널특성을 알아낸 다음 고스트 제거를 위해 상기 채널특성의 역특성을 갖는 필터계수를 계산하는 방법에 있어서, 상기 계산된 필터계수의 최대값과 최소값의 차이가 설정된 소정치보다 작으면 상기 최대값과 상기 최소값과의 질대값 크기를 비교하는 단계와; 상기 비교단계에서 상기 최대값이 크면 상기 설정된 소정수치의 2배와 비교하여 상기 최대값이 상기 설정된 소정수치의 2배보다 작고 상기 최대값 바로 다음으로 큰값의 2배와 비교하여 상기 최대값의 크기가 작으면 상기 계산된 필터계수를 “0”으로 하는 단계와; 상기 비교단계에서 상기 최소값이 크면 상기 설정된 소정수치의 2배와 비교하여 상기 최소값이 상기 설정된 소정수치의 2배보다 작고 상기 최소값 바로 다음으로 작은값의 2배와 비교하여 상기 최소값의 크기가 작으면 상기 계산된 필터계수를 “0”으로 하는 단계로 이루어진 것을 특징으로 하는 개선된 필터계수 계산방법.A method of calculating a channel coefficient between a transmission path and a receiving side and then calculating a filter coefficient having an inverse characteristic of the channel characteristic for ghost elimination, wherein a difference between the calculated maximum and minimum values of the filter coefficient is greater than a predetermined value. Comparing the magnitude value of the maximum value with the minimum value if it is small; In the comparing step, when the maximum value is large, the maximum value is smaller than twice the predetermined value, and the maximum value is smaller than twice the predetermined value, and compared to twice the maximum value immediately after the maximum value. Setting the calculated filter coefficient to “0” if less than 0; If the minimum value is large in the comparing step, the minimum value is smaller than twice the predetermined value, and the size of the minimum value is small compared to two times the smaller value immediately after the minimum value. And a step of setting said calculated filter coefficient to "0". ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940028279A 1994-10-31 1994-10-31 Method for calculating filter coefficient for ghost canceller KR0134269B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019940028279A KR0134269B1 (en) 1994-10-31 1994-10-31 Method for calculating filter coefficient for ghost canceller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019940028279A KR0134269B1 (en) 1994-10-31 1994-10-31 Method for calculating filter coefficient for ghost canceller

Publications (2)

Publication Number Publication Date
KR960016407A true KR960016407A (en) 1996-05-22
KR0134269B1 KR0134269B1 (en) 1998-04-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019940028279A KR0134269B1 (en) 1994-10-31 1994-10-31 Method for calculating filter coefficient for ghost canceller

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KR (1) KR0134269B1 (en)

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KR0134269B1 (en) 1998-04-23

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