KR930006837Y1 - Color signal filter circuit - Google Patents
Color signal filter circuit Download PDFInfo
- Publication number
- KR930006837Y1 KR930006837Y1 KR2019880012429U KR880012429U KR930006837Y1 KR 930006837 Y1 KR930006837 Y1 KR 930006837Y1 KR 2019880012429 U KR2019880012429 U KR 2019880012429U KR 880012429 U KR880012429 U KR 880012429U KR 930006837 Y1 KR930006837 Y1 KR 930006837Y1
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- South Korea
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- filter
- color signal
- coil
- capacitor
- video signal
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/06—Frequency selective two-port networks including resistors
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/12—Bandpass or bandstop filters with adjustable bandwidth and fixed centre frequency
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- Processing Of Color Television Signals (AREA)
Abstract
내용 없음.No content.
Description
제1도는 종래의 회로도.1 is a conventional circuit diagram.
제2도는 본 고안의 회로도.2 is a circuit diagram of the present invention.
제3도는 본 고안의 1,2차 필터 구성도.3 is a first and second filter configuration diagram of the present invention.
제4도는 2차 필터의 등가회로도.4 is an equivalent circuit diagram of a secondary filter.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
200 : 영상신호처리용 집적회로 210 : 1차필터200: integrated circuit for image signal processing 210: primary filter
220 : 2차필터 230 : 색신호 트랩회로220: secondary filter 230: color signal trap circuit
R1-R4: 저항 C1-C7: 콘덴서R 1 -R 4 : Resistor C 1 -C 7 : Capacitor
L1-L5: 코일L 1 -L 5 : Coil
본 고안은 케이블 TV의 영상신호 처리에 있어서 선택도가 높고 적절한 대역폭을 갖는 색신호 필터회로에 관한 것이다.The present invention relates to a color signal filter circuit having a high selectivity and an appropriate bandwidth in image signal processing of a cable TV.
종래에는 제1도에 도시한 바와같이 (a)도에서 코일(L1)의 권선간에 존재하는 분포용량(Cs)의 영향으로 고역신호의 차단이 불가능해짐으로써 원하는 색신호의 선택도를 얻기 힘들며 색신호 증폭회로(100)의 입력용량(Ci)의 영향에 의해 공진주파수가 이동하는 문제가 있으며, 또한 색신호의 필요한 대역폭을 확보하기 위해서는 댐핑저항(R1)을 사용해야하는데 이 경우 저역주파수 대역에 있어서의 관계가 성립함으로 저역차단이 곤란하다.Conventionally, as shown in FIG. 1 , it is difficult to block a high frequency signal due to the influence of the distribution capacitance Cs existing between the windings of the coil L 1 in FIG. The resonance frequency is shifted by the influence of the input capacitance Ci of the amplification circuit 100. Also, in order to secure the required bandwidth of the color signal, a damping resistor R 1 must be used. It is difficult to block the low pass because the relationship between
(b)도의 경우는 댐핑저항(R1)과 입력저항(R1)의 비율에 따라 저역감쇄비가 일정되므로 선택도를 높을 수 있고 색신호 증폭회로(100)의 입력용량(Ci)의 영향으로 공진주파수가 변화하게 되므로 코일(L2)의 가변에 의해 공진주파수를 조정하면 선택도(Q1)는이므로,만큼 선택도가 변화하는 문제가 발생한다.In the case of (b), since the low attenuation ratio is constant according to the ratio of the damping resistor R 1 and the input resistance R 1 , the selectivity can be increased and the resonance is affected by the input capacitance Ci of the color signal amplifying circuit 100. Since the frequency changes, if the resonance frequency is adjusted by the change of the coil L 2 , the selectivity Q 1 is Because of, As a matter of course, the selectivity changes.
본 고안은 상기와 같은 문제점들을 해결하기 위하여 안출한 것인바, 색신호의 입력필터를 구성함에 있어서 콘덴서와 코일로 구성되는 기본필터회로와 코일의 권선간에 존재하는 분포용량(Cs) 및 입력용량(Ci)의 영향을 감안하여 2차 공진이 이루어지도록 구성된 2차 필터의 연결로 2단필터회로를 구성함으로써 공진주파수값을 높이고 필요한 대역폭의 확보를 위한 댐핑저항을 2차 필터와 병렬로 접속함으로써 공진주파수 조정에 따른 색신호의 선택도 변화를 줄이도록 한 것으로 이하 첨부된 도면에 의하여 본 고안을 상세히 설명하면 다음과 같다.The present invention has been made to solve the above problems, the distribution capacity (Cs) and the input capacitance (Ci) existing between the basic filter circuit consisting of a capacitor and a coil and the winding of the coil in the input filter of the color signal Resonance frequency by connecting the secondary filter circuit to the secondary filter configured to make the secondary resonance in consideration of the effect of) and increasing the resonance frequency value and connecting the damping resistance in parallel with the secondary filter to secure the required bandwidth. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so as to reduce the selectivity of the color signal according to the adjustment.
제2도는 본 고안의 회로도로서 색신호와 휘도신호가 중첩된 복합영상신호는 입력저항(R1)과 콘덴서(C1)와 코일(L3)이 직렬접속을 통해 접지에 연결된 색신호트랩(230)에 인가되는 동시에 콘덴서(C4)와 코일(L4)이 직렬로 접속된 색신호필터(210)에 인가되고 상기 색신호트랩(230)의 출력은 저항(R2)(R3)과 지연소자(DL1) 및 결합콘덴서(C2)를 통하여 영상신호 처리용 집적회로(200)의 휘도(Y)입력단자에 인가된다.2 is a circuit diagram of the present invention, in which a complex image signal in which a color signal and a luminance signal are superimposed is a color signal trap 230 in which an input resistor R 1 , a capacitor C 1 , and a coil L 3 are connected to ground through a series connection. At the same time, the capacitor C 4 and the coil L 4 are applied to the color signal filter 210 connected in series, and the output of the color signal trap 230 is the resistor R 2 (R 3 ) and the delay element ( DL 1 ) and the coupling capacitor C 2 are applied to the luminance Y input terminal of the integrated circuit 200 for image signal processing.
상기 색신호필터(210)의 출력은 가변코일(L5)과 댐핑저항(R4)의 병렬로 구성된 2차 필터(200)를 거쳐 직렬연결에 의한 2단 색신호필터를 구성함으로써 그 출력이 결합콘덴서(C4)를 통해 상기 영상신호처리용 집적회로(200)의 컬러(C)입력단자에 인가된다.The output of the color signal filter 210 is composed of a two-stage color signal filter by series connection via a secondary filter 200 configured in parallel with a variable coil (L 5 ) and a damping resistor (R 4 ) so that the output of the combined capacitor It is applied to the color (C) input terminal of the integrated image signal processing circuit 200 through (C 4 ).
이하 이들의 동작 및 작용효과를 제3도에 의해 설명한다.Hereinafter, these operations and effects will be described with reference to FIG.
휘도신호와 색신호가 중첩된 복합영상신호 입력단자(101)를 통해서 콘덴서(C4)에 인가되면 이 콘덴서(C4)와 코일(L4)의 직렬공진에 의해 공진주파수(f1)는를 중심주파수로 하는 특정대역만이 직렬공진 색신호필터(210)를 통과한다.When the luminance signal and the color signal are applied to the condenser C 4 through the overlapped composite video signal input terminal 101, the resonance frequency f 1 is reduced by the series resonance of the condenser C 4 and the coil L 4 . Only a specific band with a center frequency passes through the serial resonant color signal filter 210.
이때 상기 코일(L4)의 양단간에 존재하는 극간용량(Cs1)의 영향에 의해 고역주파수는 차단되지 않는 문제가 발생한다.At this time, the high frequency does not block due to the influence of the inter-pole capacitance Cs 1 existing between both ends of the coil L 4 .
따라서 1차 색신호필터(210)의 출력에서 고역을 차단하고 색신호의 선택도를 높이기 위해 2차필터(220)를 직렬로 연결한다.Therefore, the secondary filter 220 is connected in series to block the high range at the output of the primary color signal filter 210 and to increase the selectivity of the color signal.
상기 2차필터(220)에서 콘덴서(Cs2)는 패턴(Pattern)설계에서 발생하는 분포용량이며 콘덴서(Ci)는 영상신호처리용 집적회로(200)의 입력용량이다.In the secondary filter 220, the capacitor Cs 2 is a distribution capacitance generated in the pattern design, and the capacitor Ci is an input capacitance of the integrated circuit 200 for image signal processing.
그러므로 상기 2차필터(220)는 제4도에 도시한 바와같이 등가회로를 생각할 수 있으며 이때 콘덴서(CT)의 용량가 되므로 상기 2차 필터(220)의 공진주파수(F2) 및 색신호 선택도(Q2)는가 된다.Therefore, the secondary filter 220 can be considered an equivalent circuit as shown in Figure 4, where the capacitance of the capacitor (C T ) Since the resonant frequency (F 2 ) and color signal selectivity (Q2) of the secondary filter 220 is Becomes
여기서 상기 공진주파수가 f1는 f1=f2가 되도록 코일(L4)의 값을 조정하면 회로전체의 선택도(Q)는 Q=Q1ㆍQ2(단,: 코일(L4)의 직류저항값)로 주어지므로 매우 높은 선택도를 얻을 수 있다.Here, the resonance frequency f 1 is f 1 = f 2 If the adjusted values of the coil (L 4) are selected in the overall view (Q) is Q = Q 1 and Q 2 (short circuit, : Therefore given by the DC resistance of the coil (L 4)) to obtain a very high selectivity.
또한 상기 코일(L7)과 병렬로 댐핑저항(R4)을 연결하면 적절한 색신호의 대역폭을 얻을 수 있다.In addition, by connecting the damping resistor (R 4 ) in parallel with the coil (L 7 ) it is possible to obtain the appropriate bandwidth of the color signal.
이상에서 설명한 바와같이 본 고안은 색신호의 선택도가 높고 적절한 대역폭을 갖는 색신호 필터회로를 소수의 부품만으로 구성할 수 있고 패턴 및 영상신호 처리용 집적회로의 특성이 회로정수에 반영되므로 정확한 공진주파수를 얻을 수 있는 효과가 있는 것이다.As described above, the present invention can constitute a color signal filter circuit having a high selectivity of color signals and an appropriate bandwidth with only a few components. There is an effect that can be obtained.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019880012429U KR930006837Y1 (en) | 1988-07-29 | 1988-07-29 | Color signal filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019880012429U KR930006837Y1 (en) | 1988-07-29 | 1988-07-29 | Color signal filter circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR900003903U KR900003903U (en) | 1990-02-08 |
| KR930006837Y1 true KR930006837Y1 (en) | 1993-10-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019880012429U Expired - Fee Related KR930006837Y1 (en) | 1988-07-29 | 1988-07-29 | Color signal filter circuit |
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| Country | Link |
|---|---|
| KR (1) | KR930006837Y1 (en) |
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1988
- 1988-07-29 KR KR2019880012429U patent/KR930006837Y1/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| KR900003903U (en) | 1990-02-08 |
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