KR100838575B1 - Noise removal circuit for liquid crystal display television - Google Patents

Noise removal circuit for liquid crystal display television Download PDF

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Publication number
KR100838575B1
KR100838575B1 KR1020070004509A KR20070004509A KR100838575B1 KR 100838575 B1 KR100838575 B1 KR 100838575B1 KR 1020070004509 A KR1020070004509 A KR 1020070004509A KR 20070004509 A KR20070004509 A KR 20070004509A KR 100838575 B1 KR100838575 B1 KR 100838575B1
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South Korea
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noise
filter
tuner
microcomputer
decoder
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KR1020070004509A
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Korean (ko)
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고명기
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주식회사 대우일렉트로닉스
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/80—Camera processing pipelines; Components thereof
    • H04N23/81—Camera processing pipelines; Components thereof for suppressing or minimising disturbance in the image signal generation
    • 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
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
    • H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
    • 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
    • H04N5/50—Tuning indicators; Automatic tuning control
    • 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
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
    • H04B2001/1063—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal using a notch filter

Abstract

A noise canceling circuit for an LCD TV is provided to reduce noise directly using a notch filter, thereby reducing the generation of the noise without the deterioration of definition. A noise canceling circuit for an LCD(Liquid Crystal Display) TV comprises a microcomputer(1), a tuner(2), a decoder(3), and a noise filter(4). The microcomputer outputs a control signal necessary for noise cancellation according to noise filter settings. The tuner receives a broadcasting signal. The decoder decodes the broadcasting signal received through the tuner. The noise filter is positioned in the decoder to filter and output the frequency of a specific band according to the control signal of the microcomputer. Further, the noise filter is a notch filter.

Description

엘씨디 텔레비전의 노이즈 제거회로{Noise removal circuit for liquid crystal display television}Noise removal circuit for liquid crystal display television

도 1은 본 발명 엘씨디 텔레비전의 노이즈 제거회로 바람직한 실시예에 따른 회로도이다.1 is a circuit diagram according to a preferred embodiment of the noise canceling circuit of the present invention.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

1:마이크로 컴퓨터 1: micro computer

2:튜너2: tuner

3:디코더 3: decoder

4:노이즈 필터4: noise filter

본 발명은 엘씨디 텔레비전의 노이즈 제거회로에 관한 것으로, 더욱 상세하게는 선명도의 저하 정도를 줄이면서 노이즈를 제거할 수 있는 엘씨디 텔레비전의 노이즈 제거회로에 관한 것이다.The present invention relates to a noise canceling circuit of an LCD television, and more particularly, to a noise canceling circuit of an LCD television capable of removing noise while reducing the degree of deterioration of sharpness.

일반적으로, 엘씨디 텔레비전은 디스플레이 해상도가 높아 노이즈가 비교적 많이 발생한다. In general, an LCD television has a high display resolution and generates a lot of noise.

종래에는 이와 같은 노이즈를 제거하는 방식이 아닌 노이즈를 숨기는 방식을 사용하였다.In the related art, a method of hiding noise is used instead of a method of removing such noise.

즉, 피킹(peaking)을 약하게 함으로써 화면을 희미하게 하여 노이즈를 숨기는 방법을 사용하였으나, 이와 같은 방식에 의해 화면의 선명도가 저하되는 문제점이 있었다.That is, although the method of hiding the noise by blurring the screen by weakening the peaking (peaking), there was a problem that the sharpness of the screen is reduced by this method.

본 발명은 전술한 문제점을 개선하기 위해 창안된 것으로서, 화면의 선명도를 감소시키지 않고 엘씨디 텔레비전의 노이즈를 제거할 수 있는 엘씨디 텔레비전의 노이즈 제거회로를 제공하는데에 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object thereof is to provide a noise removing circuit of an LCD television that can remove noise of an LCD television without reducing the sharpness of the screen.

전술한 목적을 달성하기 위해 창안된 본 발명의 구성은 다음과 같다. 본 발명의 엘씨디 텔레비전의 노이즈 제거회로는 노이즈 필터 설정에 따라 노이즈 제거에 필요한 제어신호를 출력하는 마이크로 컴퓨터와, 방송신호를 수신하는 튜너와, 상기 튜너를 통해 수신된 방송신호를 디코딩하는 디코더와, 상기 디코더 내에 위치하여 상기 마이크로 컴퓨터의 제어신호에 따라 특정 대역의 주파수를 필터링하여 출력하는 노이즈 필터를 포함하는 것을 특징으로 한다.
상기 노이즈 필터는 노치 필터(notch filter)인 것을 특징으로 한다.
상기 노이즈 필터 설정은 사용자가 노이즈 필터의 강약을 선택한 것이거나, 상기 마이크로 컴퓨터에서 상기 튜너를 통해 수신된 영상신호의 AGC 전압 및 신호수신감도에 따라 설정하는 것을 특징으로 한다.The present invention devised to achieve the above object is as follows. The noise canceling circuit of an LCD television of the present invention includes a microcomputer for outputting a control signal for noise removal according to a noise filter setting, a tuner for receiving a broadcast signal, a decoder for decoding the broadcast signal received through the tuner, And a noise filter positioned in the decoder to filter and output a frequency of a specific band according to a control signal of the microcomputer.
The noise filter may be a notch filter.
The noise filter setting is characterized in that the user selects the strength or weakness of the noise filter or sets it according to the AGC voltage and signal reception sensitivity of the image signal received through the tuner from the microcomputer.

이하에서는 본 발명의 실시예를 첨부된 도면을 참조하여 상세하게 설명한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1 은 본 발명 엘씨디 텔레비전의 노이즈 제거회로의 바람직한 실시예에 따른 회로도이다.1 is a circuit diagram according to a preferred embodiment of the noise canceling circuit of the present invention.

도 1 을 참조하면, 본 발명 엘씨디 텔레비전의 노이즈 제거회로는 사용자의 노이즈 필터 설정을 입력받아 그 노이즈 필터 설정에 따른 제어를 수행하는 마이크로 컴퓨터(1)와, 상기 마이크로 컴퓨터(1)의 제어에 따라 튜너(2)에서 수신된 방송신호를 디코딩하는 디코더(3)와, 상기 디코더(4)의 내부에 위치하여 상기 디코더(3)의 출력신호에서 상기 사용자의 노이즈 필터 설정에 따라 노이즈를 제거하는 노이즈 필터(4)를 포함한다.Referring to FIG. 1, the noise canceling circuit of an LCD television of the present invention receives a noise filter setting of a user and performs control according to the noise filter setting, and according to the control of the microcomputer 1. A decoder 3 for decoding the broadcast signal received by the tuner 2 and a noise located inside the decoder 4 to remove noise from the output signal of the decoder 3 according to the noise filter setting of the user. And a filter 4.

이하, 상기와 같이 구성되는 본 발명 엘씨디 텔레비전의 노이즈 제거회로의 구성과 작용을 보다 상세히 설명한다.Hereinafter, the configuration and operation of the noise canceling circuit of the present invention the LCD television configured as described above will be described in more detail.

먼저, 상기 마이크로 컴퓨터(1)는 사용자가 엘씨디 텔레비전의 설정을 변경할 수 있는 온스크린 디스플레이 상에 노이즈 필터(4)의 설정을 변경할 수 있는 화 면을 제공한다.First, the microcomputer 1 provides a screen on which the user can change the settings of the noise filter 4 on the on-screen display, which can change the settings of the LCD television.

온스크린 디스플레이 상에서 표시되는 노이즈 필터(4)의 설정은 그 필터의 강약을 조절할 수 있는 설정이며, 그 설정에 따라 상기 마이크로 컴퓨터(1)는 노이즈 필터(4)의 동작을 제어한다.The setting of the noise filter 4 displayed on the on-screen display is a setting that can adjust the strength and weakness of the filter, and according to the setting, the microcomputer 1 controls the operation of the noise filter 4.

노이즈 필터(4)는 노치 필터(notch filter)를 사용함이 바람직하다.The noise filter 4 preferably uses a notch filter.

노치필터는 특정의 주파수에서 급격한 감쇠특성을 가지고 있는 필터로서, 주로 불필요한 주파수 성분을 제거하는데 사용한다.Notch filter is a filter that has a rapid attenuation characteristic at a specific frequency and is mainly used to remove unnecessary frequency components.

마이크로 컴퓨터(1)는 튜너(2)에서 수신된 방송신호를 디코더(3)에서 디코딩하며, 이때 상기 노치필터인 노이즈 필터(4)의 필터대역을 상기 입력된 사용자의 노이즈 필터 설정을 이용하여 제어한다.The microcomputer 1 decodes the broadcast signal received from the tuner 2 at the decoder 3, and controls the filter band of the noise filter 4, which is the notch filter, using the noise filter setting of the input user. do.

노이즈 필터 설정이 강일 때 상기 노이즈 필터(4)는 4.5MHz 대역, 중일 때 3.5MHz 대역, 약일 때 2.5MHz 대역의 신호를 필터링한다.When the noise filter setting is strong, the noise filter 4 filters signals in the 4.5 MHz band, the 3.5 MHz band in the middle, and the 2.5 MHz band in the weak state.

이와 같은 필터링 결과에 의해 화면에 표시되는 영상에 차이가 있으며, 사용자는 그 화면의 표시상태에 따라 상기 노이즈 필터 설정을 변경하여 최적의 화면 상태를 얻을 수 있다.As a result of the filtering, there is a difference in the image displayed on the screen, and the user can change the noise filter setting according to the display state of the screen to obtain an optimal screen state.

이와 같은 구성 외에 상기 마이크로 컴퓨터(1)에서 튜너(2)에서 수신된 방송신호에 따라 자동으로 상기 노이즈 필터(4)의 필터링 대역을 제어할 수 있다.In addition to such a configuration, the microcomputer 1 may automatically control the filtering band of the noise filter 4 according to the broadcast signal received by the tuner 2.

이는 상기 튜너(2)에서 수신된 방송신호가 AGC 전압이 4~5V, 신호수신감도 60dB 이하인 경우 그 노이즈 필터(4)를 2.5MHz 대역의 주파수를 필터링하도록 제어하고, AGC 전압이 2.5~3V, 신호수신감도가 70dB의 방송신호는 3.5MHz 대역, AGC 전압이 5V 이하 신호수신감도가 90dB의 신호는 4.5MHz 대역의 주파수를 필터링 하도록 제어한다.When the broadcast signal received by the tuner 2 has an AGC voltage of 4-5 V and a signal reception sensitivity of 60 dB or less, the noise filter 4 is controlled to filter frequencies in the 2.5 MHz band, and the AGC voltage is 2.5-3 V, The broadcast signal with 70dB signal reception sensitivity is controlled to 3.5MHz band, and the AGC voltage is below 5V and the signal reception sensitivity 90dB signal is filtered to 4.5MHz band.

이와 같은 본 발명은 직접 노이즈를 감소시키는 것으로, 종래의 피킹 필터 방식과는 다르게 선명도의 저하를 유발하지 않고, 노이즈를 감소시킬 수 있게 된다.As described above, the present invention directly reduces noise, and unlike the conventional picking filter method, noise can be reduced without causing a decrease in sharpness.

본 발명은 전술한 실시예에 국한되지 않고 본 발명의 기술사상이 허용되는 범위 내에서 다양하게 변형하여 실시할 수 있다.The present invention is not limited to the above-described embodiments and can be carried out in various modifications within the scope of the technical idea of the present invention.

이와 같이 구성되는 본 발명에 따르면, 노치 필터를 사용하여 직접 노이즈를 줄임으로써, 선명도의 저하 없이 노이즈 발생을 줄일 수 있는 효과가 있다.According to the present invention configured as described above, by directly reducing the noise using a notch filter, it is possible to reduce the occurrence of noise without deteriorating the sharpness.

Claims (3)

노이즈 필터 설정에 따라 노이즈 제거에 필요한 제어신호를 출력하는 마이크로 컴퓨터;A microcomputer for outputting a control signal for removing noise in accordance with the noise filter setting; 방송신호를 수신하는 튜너;A tuner for receiving a broadcast signal; 상기 튜너를 통해 수신된 방송신호를 디코딩하는 디코더; 및A decoder for decoding the broadcast signal received through the tuner; And 상기 디코더 내에 위치하여 상기 마이크로 컴퓨터의 제어신호에 따라 특정 대역의 주파수를 필터링하여 출력하는 노이즈 필터를 포함하는 엘씨디 텔레비전의 노이즈 제거회로.And a noise filter positioned in the decoder to filter and output a frequency of a specific band according to a control signal of the microcomputer. 제 1 항에 있어서, The method of claim 1, 상기 노이즈 필터는,The noise filter, 노치 필터(notch filter)인 것을 특징으로 하는 엘씨디 텔레비전의 노이즈 제거회로.A noise reduction circuit of an LCD television, which is a notch filter. 제 1 항 또는 제 2 항에 있어서,The method according to claim 1 or 2, 상기 노이즈 필터 설정은,The noise filter setting, 사용자가 노이즈 필터의 강약을 선택한 것이거나, 상기 마이크로 컴퓨터에서 상기 튜너를 통해 수신된 영상신호의 AGC 전압 및 신호수신감도에 따라 설정하는 것을 특징으로 하는 엘씨디 텔레비전의 노이즈 제거회로.The user selects the strength of the noise filter, or sets the noise reduction circuit of the LCD television according to the AGC voltage and signal reception sensitivity of the video signal received through the tuner from the microcomputer.
KR1020070004509A 2007-01-15 2007-01-15 Noise removal circuit for liquid crystal display television KR100838575B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050032487A (en) 2003-10-01 2005-04-07 코프라 인터액티브 시스템즈 인터내셔날, 엘엘씨 Method and apparatus for modulating a video signal with data
KR20060135720A (en) 2004-12-13 2006-12-29 마쯔시다덴기산교 가부시키가이샤 High frequency receiver, integrated circuit used therein, mobile device using them, transmitter used therein, and method for making them
KR20070012047A (en) 2005-07-22 2007-01-25 삼성전자주식회사 Digital video processing apparatus and control method thereof
KR20070088270A (en) 2005-01-17 2007-08-29 마츠시타 덴끼 산교 가부시키가이샤 Tuner and mobile device using the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050032487A (en) 2003-10-01 2005-04-07 코프라 인터액티브 시스템즈 인터내셔날, 엘엘씨 Method and apparatus for modulating a video signal with data
KR20060135720A (en) 2004-12-13 2006-12-29 마쯔시다덴기산교 가부시키가이샤 High frequency receiver, integrated circuit used therein, mobile device using them, transmitter used therein, and method for making them
KR20070088270A (en) 2005-01-17 2007-08-29 마츠시타 덴끼 산교 가부시키가이샤 Tuner and mobile device using the same
KR20070012047A (en) 2005-07-22 2007-01-25 삼성전자주식회사 Digital video processing apparatus and control method thereof

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