KR0158596B1 - Frequency channel signal trap circuit - Google Patents
Frequency channel signal trap circuit Download PDFInfo
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- KR0158596B1 KR0158596B1 KR1019950044673A KR19950044673A KR0158596B1 KR 0158596 B1 KR0158596 B1 KR 0158596B1 KR 1019950044673 A KR1019950044673 A KR 1019950044673A KR 19950044673 A KR19950044673 A KR 19950044673A KR 0158596 B1 KR0158596 B1 KR 0158596B1
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- intermediate frequency
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- circuit
- channel
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/02—Details
- H03J3/06—Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges
- H03J3/08—Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges by varying a second parameter simultaneously with the tuning, e.g. coupling bandpass filter
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/20—Continuous tuning of single resonant circuit by varying inductance only or capacitance only
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Abstract
본 발명은 인접중간주파 채널신호 트랩회로(Trap Circuit)에 관한 것이다.The present invention relates to an adjacent intermediate frequency channel signal trap circuit.
본 발명은 튜너의 주파수변화부에서 출력되는 중간주파신호에 있어서, 소망 중간주파신호에 인접하는 영상 및 음성채널신호를 제거하므로써, 인접채널방해 특성을 양호히 개선하는 효과가 있는 것이다.The present invention has the effect of improving the adjacent channel interference characteristics by removing the video and audio channel signals adjacent to the desired intermediate frequency signal in the intermediate frequency signal output from the frequency changer of the tuner.
Description
제1도는 종래의 주파수변환부 및 저역통과필터의 회로도.1 is a circuit diagram of a conventional frequency converter and a low pass filter.
제2도는 본 발명에 따른 인접중간주파 채널신호 트랩회로도.2 is an adjacent intermediate frequency channel signal trap circuit diagram according to the present invention.
제3도는 본 발명과 종래의 중간주파신호를 비교하기 위한 파형도.3 is a waveform diagram for comparing the present invention and a conventional intermediate frequency signal.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 주파수변환부 2 : 트랩회로부1: Frequency converter 2: Trap circuit
3 : 저역통과필터3: low pass filter
본 발명은 인접중간주파 채널신호 트랩회로(Trap Circuit)에 관한 것으로, 특히 튜너의 주파수변화부에서 출력되는 중간주파신호에 있어서, 소망하는 중간주파신호에 포함된 영상 및 음성인접채널신호를 제거하므로써, 인접채널방해 특성을 개선하는 인접중간주파 채널신호 트랩회로에 관한 것이다.The present invention relates to an adjacent intermediate frequency channel signal trap circuit, and in particular, in an intermediate frequency signal output from a frequency changer of a tuner, by removing a video and audio adjacent channel signal included in a desired intermediate frequency signal. The present invention relates to an adjacent intermediate frequency channel signal trap circuit for improving adjacent channel disturbance characteristics.
일반적으로, 튜너(TUNER)는 특정한 주파수에 동조하도록 하는 장치로, 몇개의 단위회로 조합으로 구성되어 금속성 케이스에 넣어져 실드되어 지는데, 상기 튜너내부에는 입력되는 고주파신호와 발진부에서 출력되는 발진신호를 믹서에서 혼합하여 소정의 중간주파신호를 출력하는 주파수변환부를 포함하고 있다.In general, a tuner (TUNER) is a device for tuning to a specific frequency, composed of a combination of several unit circuits are shielded in a metal case, the inside of the tuner is a high frequency signal input and the oscillation signal output from the oscillator And a frequency converter for mixing the mixer and outputting a predetermined intermediate frequency signal.
제1도는 종래의 주파수변환부 및 저역통과필터의 회로도로, 제1도를 참조하면, 주파수변환부(1)에서 출력되는 중간주파신호는 결합용콘덴서(C1)를 경유하여 저역통과필터(3)에서 저역통과된다.FIG. 1 is a circuit diagram of a conventional frequency converter and a low pass filter. Referring to FIG. 1, an intermediate frequency signal output from the frequency converter 1 passes through a coupling capacitor C1. ) Is lowpass.
이와 같이, 종래에 주파수변환부(1)에서 출력되는 중간주파신호를 오실로스코우프로 관찰하면 제3도(a)와 같이 나타나는데, 제3도(a)에서 보인 바와 같이 수신채널의 음성중간주파수(SIF)는 33.4[MHz]이고, 영상중간주파수(PIF)가 38.9[MHz]인 경우에, 이 수신채널의 인접채널에 포함되는 31.9[MHz]의 영상중간주파수와 40.4[MHz]의 음성중간주파수가 상하측 대역 각각에 포함되어 있는 관계로, 이 인접채널이 소망하는 신호에 방해파로 작용하는 문제점이 있었다.As described above, when the intermediate frequency signal outputted from the frequency converter 1 is observed with an oscilloscope, it appears as shown in FIG. 3 (a). As shown in FIG. (SIF) is 33.4 [MHz], and when the video intermediate frequency (PIF) is 38.9 [MHz], the video intermediate frequency of 31.9 [MHz] included in the adjacent channel of this receiving channel and the voice intermediate of 40.4 [MHz] are included. Since frequency is included in each of the upper and lower bands, there is a problem that this adjacent channel acts as a disturbing wave to a desired signal.
본 발명은 상기한 종래의 문제점을 해결하기 위해 안출한 것이다.The present invention has been made to solve the above-mentioned conventional problems.
따라서, 본 발명의 목적은 튜너의 주파수변환부에서 출력되는 중간주파신호에 있어서, 소망하는 중간주파신호에 포함된 영상 및 음성인접채널신호를 제거하므로써, 인접채널방해 특성을 개선하는 인접중간주파 채널신호 트랩회로를 제공하는데 있다.Accordingly, an object of the present invention is to remove an adjacent channel signal included in a desired intermediate frequency signal in an intermediate frequency signal output from a frequency converter of a tuner, thereby improving adjacent channel interference characteristics. It is to provide a signal trap circuit.
상기한 목적을 달성하기 위한 기술적인 수단으로써, 본 발명의 중간주파신호에서의 인접채널 트랩회로는 중간주파신호를 출력하는 주파수변환부와, 상기 주파수변환부에서 출력되고 결합용콘덴서를 경유한 중간주파신호를 저역통과시키는 저역통과필터를 포함하는 튜너에 있어서, 상기 주파수변환부에서 출력되는 소망 중간주파신호에 인접하는 영상 및 음성채널 신호를 각각 트랩시키도록 트랩포인트를 형성시키는 트랩회로부를 상기 결합콘덴서와 저역통과필터 사이에 구성함을 특징으로한다.As a technical means for achieving the above object, the adjacent channel trap circuit in the intermediate frequency signal of the present invention is a frequency conversion unit for outputting the intermediate frequency signal, and the intermediate output from the frequency conversion unit via the coupling capacitor A tuner comprising a low pass filter for low-passing a frequency signal, the tuner comprising: a trap circuit section for forming a trap point to trap a video and audio channel signal adjacent to a desired intermediate frequency signal output from the frequency converter; It is characterized by the configuration between the condenser and the low pass filter.
이하, 본 발명을 첨부한 도면을 참조하여 설명한다.Hereinafter, with reference to the accompanying drawings, the present invention will be described.
본 발명에 참조된 도면들에서 실질적으로 동일한 구성과 기능을 가진 구성요소들은 동일한 부호를 사용할 것이다.In the drawings referred to in the present invention, components having substantially the same configuration and function will use the same reference numerals.
제2도는 본 발명에 따른 인접중간주파 채널신호 트랩회로도이다.2 is an adjacent intermediate frequency channel signal trap circuit diagram according to the present invention.
제2도를 참조하면, 본 발명의 중간주파신호에서의 인접채널 트랩회로는 중간주파신호를 출력하는 주파수변환부(1)와, 상기 주파수변환부(1)에서 출력되고 결합용콘덴서(C1)를 경유한 중간주파신호를 저역통과시키는 저역통과필터(3)를 포함하는 튜너에 있어서, 상기 주파수변환부(1)에서 출력되는 소망 중간주파신호에 인접하는 영상 및 음성채널신호를 각각 트랩시키도록 트랩포인트를 형성시키는 트랩회로부(3)를 상기 결합콘덴서(C1)와 저역통과필터(3) 사이에 구성한다.Referring to FIG. 2, the adjacent channel trap circuit in the intermediate frequency signal of the present invention includes a frequency converter 1 for outputting an intermediate frequency signal, and a coupling capacitor C1 that is output from the frequency converter 1. A tuner comprising a low pass filter (3) for low-passing an intermediate frequency signal via a channel, wherein the tuner traps video and audio channel signals adjacent to a desired intermediate frequency signal output from the frequency converter (1). A trap circuit section 3 for forming a trap point is provided between the coupling capacitor C1 and the low pass filter 3.
상기 트랩회로부(2)는 선로상에 제1병렬공진회로(L2,C3)와 제2병렬공진회로(L3,C4)를 구성하고, 또한 상기 트랩회로부(2)는 그 트랩포인터 각각을 수신채널의 인접채널에 포함되는 영상주간주파수와 음성중간주파수 각각에 형성시키도록 구성한다.The trap circuit section 2 constitutes a first parallel resonance circuit L2, C3 and a second parallel resonance circuit L3, C4 on the line, and the trap circuit section 2 receives each of its trap pointers. It is configured to form on each of the video frequency and the audio frequency included in the adjacent channel of.
제3도는 본 발명과 종래의 중간주파신호를 비교하기 위한 파형도이다.3 is a waveform diagram for comparing the present invention and a conventional intermediate frequency signal.
이하, 본 발명에 따른 작용 및 효과를 첨부도면에 의거하여 상세히 설명한다.Hereinafter, the operation and effect according to the present invention will be described in detail with reference to the accompanying drawings.
제2도 및 제3도를 참조하면, 본 발명은 코일과 콘덴서로 병렬공진회로로 트랩회로를 구성하는데, 예를들어 소망하는 채널의 영상중간주파수(PIF)가 38.8[MHz]이고 그 음성중간주파수(SIF)가 33.4[MHz]인 경우에 있어서, 제3도(b)와 도시된 그 트랩포인터(TP1,TP2)를 제3도(a)에 도시된 인접채널의 영상중간주파수(P)인 31.9 [ M Hz]와 음성중간주파수(S)인 40.4[MHz]에 맞추어 상기 인접채널의 영상 및 음성주파수를 각각 트랩시킨다.2 and 3, the present invention configures a trap circuit with a parallel resonance circuit with a coil and a condenser. For example, the video intermediate frequency (PIF) of a desired channel is 38.8 [MHz] and the audio intermediate In the case where the frequency SIF is 33.4 [MHz], the image intermediate frequency P of the adjacent channel shown in FIG. 3 (a) and the trap pointers TP1 and TP2 shown in FIG. The video and audio frequencies of the adjacent channel are trapped in accordance with 31.9 [M Hz] and 40.4 [MHz], respectively.
한편, 병렬공진회로(L2,C3)(L3,C4)는 코일과 콘덴서를 사용해서 병렬로 공진시키는 회로로, 이와 같이 각 트랩회로에서 병렬로 공진을 시키면 이에 의해서 형성되는 공진주파수에서 임피던스(Impedance)값이 최대가 되어 통과되는 전류가 최소화된다. 따라서, 상기 두 병렬공진회로(L2,C3)(L3,C4)에서 인접채널의 영상중간주파수(31.9MHz) 및 음성중간주파수(40.4MHz) 각각과 공진주파수가 동일하도록 상기 공진회로의 콘덴서의 커패시턴서와 코일의 인덕턴스를 적절히 맞추면, 상기 인접채널에 포함되는 영상 및 음성중간주파수는 임피던스가 최대인 트랩회로부에 의해서 차단되는 것이다.On the other hand, the parallel resonant circuit (L2, C3) (L3, C4) is a circuit that resonates in parallel using a coil and a condenser, and if the resonance in each trap circuit in parallel in this way the impedance at the resonance frequency formed thereby Value is maximized to minimize the current passing through it. Therefore, in the two parallel resonant circuits (L2, C3) (L3, C4), the capacitor of the capacitor of the resonant circuit so that the resonant frequency is equal to each of the image intermediate frequency (31.9 MHz) and the voice intermediate frequency (40.4 MHz) of the adjacent channel. When the inductance of the capacitor and the coil is properly adjusted, the video and audio intermediate frequencies included in the adjacent channel are blocked by the trap circuit unit having the largest impedance.
상기와 같이 인접채널의 영상 및 음성중간주파수를 트랩시키는 측정파형이 제3도(b)에 도시되어 있으며, 이는 제3도(a)에 도시된 종래의 파형과는 트랩포인터가 형성된 인접채널부근에서 다름을 확인할 수 있다.The measurement waveform for trapping the video and audio intermediate frequencies of the adjacent channel as shown above is shown in FIG. 3 (b), which is adjacent to the adjacent channel in which the trap pointer is formed from the conventional waveform shown in FIG. You can see the difference in
상술한 바와 같이, 본 발명은 튜너의 주파수변환부에서 출력되는 중간주파신호에 있어서, 이 중간주파신호에 포함된 인접채널신호를 제거하므로써, 인접채널방해 특성을 개선하는 특유의 효과가 있는 것이다.As described above, the present invention has a unique effect of improving the adjacent channel interference characteristics by removing the adjacent channel signal included in the intermediate frequency signal in the intermediate frequency signal output from the frequency converter of the tuner.
이상의 설명은 본 발명의 일실시예에 대한 설명에 불과하며, 본 발명은 그 구성의 범위내에서 다양한 변경 및 개조가 가능하다.The above description is only a description of one embodiment of the present invention, the present invention is capable of various changes and modifications within the scope of the configuration.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950044673A KR0158596B1 (en) | 1995-11-29 | 1995-11-29 | Frequency channel signal trap circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950044673A KR0158596B1 (en) | 1995-11-29 | 1995-11-29 | Frequency channel signal trap circuit |
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| Publication Number | Publication Date |
|---|---|
| KR970031276A KR970031276A (en) | 1997-06-26 |
| KR0158596B1 true KR0158596B1 (en) | 1999-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019950044673A KR0158596B1 (en) | 1995-11-29 | 1995-11-29 | Frequency channel signal trap circuit |
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| KR (1) | KR0158596B1 (en) |
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1995
- 1995-11-29 KR KR1019950044673A patent/KR0158596B1/en not_active IP Right Cessation
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| KR970031276A (en) | 1997-06-26 |
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