KR0158598B1 - Receiving band width automatic control type trap circuit - Google Patents
Receiving band width automatic control type trap circuit Download PDFInfo
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- KR0158598B1 KR0158598B1 KR1019950044674A KR19950044674A KR0158598B1 KR 0158598 B1 KR0158598 B1 KR 0158598B1 KR 1019950044674 A KR1019950044674 A KR 1019950044674A KR 19950044674 A KR19950044674 A KR 19950044674A KR 0158598 B1 KR0158598 B1 KR 0158598B1
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- band
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- adjacent channel
- trap circuit
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/24—Continuous tuning of more than one resonant circuit simultaneously, the circuits being tuned to substantially the same frequency, e.g. for single-knob tuning
- H03J3/26—Continuous tuning of more than one resonant circuit simultaneously, the circuits being tuned to substantially the same frequency, e.g. for single-knob tuning the circuits being coupled so as to form a bandpass filter
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- 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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- Filters And Equalizers (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
본 발명은 수신대역별 자동조정식 트랩회로(Trap Circuit)에 관한 것으로, 특히 튜너의 주파수변환부에서 출력되는 중간주파신호에 있어서, 수신되는 대역에 따라 각기 다른 인접채널신호를 트랩시키도록 트랩점(Trap point)이 자동조정되도록 함으로써, 인접채널방해 특성을 개선하는 수신대역별 자동조정식 트랩회로에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatically adjustable trap circuit for each reception band. In particular, in an intermediate frequency signal output from a frequency converter of a tuner, a trap point for trapping different adjacent channel signals according to a received band ( The present invention relates to a self-adjusting trap circuit for each reception band that improves adjacent channel disturbance characteristics by automatically adjusting a trap point.
본 발명은 VHF대역과 UHF대역을 동시에 수신할 수 있도록 되는 튜너에 있어서, 상기 튜너에 포함되는 주파수변환IC(10)에서 출력되는 중간주파신호에 포함되는 인접 채널신호를 수신대역(VHF대역 또는 UHF대역)에 따라서 각기 주파수가 다른 인접채널신호를 UHF대역을 선택하는 경우에 세트에서 발생되는 UHF대역 선택전압을 이용함으로써, 수신대역별로 달라지는 인접채널신호에 해당하는 트랩점을 형성하도록 한 것이다.The present invention provides a tuner capable of simultaneously receiving a VHF band and a UHF band, wherein the adjacent channel signal included in an intermediate frequency signal output from the frequency conversion IC 10 included in the tuner is a reception band (VHF band or UHF band). In the case of selecting the UHF band for adjacent channel signals having different frequencies according to the band), a trap point corresponding to the adjacent channel signal that varies for each reception band is formed by using the UHF band selection voltage generated in the set.
Description
제1도는 종래의 트랩회로도.1 is a conventional trap circuit diagram.
제2도는 본 발명에 따른 트랩회로도.2 is a trap circuit diagram according to the present invention.
제3도는 제2도에 도시한 트랩회로의 수신대역에 따른 등가회로도.3 is an equivalent circuit diagram according to the reception band of the trap circuit shown in FIG.
제4도는 본 발명에 의해 수신대역에 따라 트랩점 이동을 보이는 파형도.4 is a waveform diagram showing a trap point movement according to a reception band according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
10 : 주파수변환IC 25 : 제1트랩회로부10: frequency conversion IC 25: first trap circuit section
35 : 제2트랩회로부35: second trap circuit
본 발명은 수신대역별 자동조정식 트랩회로(Trap Circuit)에 관한 것으로, 특히 튜너의 주파수변환부에서 출력되는 중간주파신호에 있어서, 수신되는 대역에 따라 각기 다른 인접채널신호를 트랩시키도록 트랩점(Trap point)이 자동조정되도록 함으로써, 인접채널방해 특성을 개선하는 수신대역별 자동조정식 트랩회로에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatically adjustable trap circuit for each reception band. In particular, in an intermediate frequency signal output from a frequency converter of a tuner, a trap point for trapping different adjacent channel signals according to a received band ( The present invention relates to a self-adjusting trap circuit for each reception band that improves adjacent channel disturbance characteristics by automatically adjusting a trap point.
일반적으로, 튜너(TUNER)는 특정한 주파수에 동조하도록 하는 장치로, 몇개의단위회로 조합으로 구성되어 금속성 케이스에 넣어져 실드되어 지는데, 상기 튜너내부에는 입력되는 고주파신호와 발진부에서 출력되는 발진신호를 믹서에서 혼합하여 소정의 중간주파신호를 출력하는 주파수변환부(또는 주파수변환IC)를 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 put in a shielded 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 (or frequency converter IC) for mixing in a mixer and outputting a predetermined intermediate frequency signal.
상기와 같은 주파수변환에서 출력되는 중간주파수에는 인접채널의 영상주파수와 음성주파수가 상측과 하측대에 각각 포함되어 채널간 간섭현상이 일어나는데, 이와 같은 채널신호간 상호간섭현상을 억제시키기 위해서 트랩회로를 사용하고 있다.In the intermediate frequency output from the above frequency conversion, video and audio frequencies of adjacent channels are included in the upper and lower bands, respectively, so that interference occurs between channels. I use it.
종래에 사용하고 있는 트랩회로부는 제1도에 도시되어 있으며, 제1도에 도시되어 있는 바와 같이 주파수변환IC(10)에서 출력되는 중간주파신호는 제1트랩회로부(20)에서 인접채널의 음성중간주파수가 트랩되고, 제2트랩회로부(30)에서 인접채널의 영상중간주파수가 트랩된다.The conventional trap circuit portion is shown in FIG. 1, and as shown in FIG. 1, the intermediate frequency signal output from the frequency conversion IC 10 is transmitted to the adjacent channel by the first trap circuit portion 20. FIG. The intermediate frequency is trapped, and the image intermediate frequency of the adjacent channel is trapped by the second trap circuit unit 30.
상기 주파수변환부(10)에서 출력되는 중간주파신호에는 음성중간주파수(SIF)는 33.4[MHz]이고, 영상중간주파수(PIF)가 38.9[MHz]인데, 상기 수신채널이 VHF대역(채널대역이 7MHz)일 경우에는 수신채널의 인접채널에 포함되는 31.9[MHz]의 영상중간주파수와 40.4[MHz]의 음성중간주파수가 상하측 대역 각각에 포함되어 있으며, 또한 수신대역이 UHF대역(채널 대역이 8MHz)일 경우에는 수신채널의 인접채널에 포함되는 30.9[MHz]의 영상중간주파수와 41.4[MHz]의 음성중간주파수가 상하측 대역 각각에 포함되어 있다.The intermediate frequency signal output from the frequency converter 10 has a voice intermediate frequency (SIF) of 33.4 [MHz] and an image intermediate frequency (PIF) of 38.9 [MHz]. 7MHz), the video intermediate frequency of 31.9 [MHz] and the voice intermediate frequency of 40.4 [MHz] included in the adjacent channel of the receiving channel are included in the upper and lower bands, and the receiving band is UHF band 8MHz), the 30.9 [MHz] video intermediate frequency and 41.4 [MHz] audio intermediate frequency included in the adjacent channel of the reception channel are included in the upper and lower bands, respectively.
이와 같이 수신하는 대역에 따라서 수신대역에 인접채널신호가 포함되는 포인트가 다른 관계로, 종래 트랩점이 고정되어 있는 트랩회로는 소망 수신채널에 포함되어 있는 인접채널신호를 효과적으로 억제할 수 없으며, 이로 인해서 소망하는 신호에 방해파로 작용하는 문제점이 있었다.In this way, since the point where the adjacent channel signal is included in the reception band is different depending on the band to be received, the trap circuit having a fixed trap point cannot effectively suppress the adjacent channel signal included in the desired reception channel. There was a problem acting as a jamming wave for 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 주파수변환부에 출력되는 중간주파신호에 있어서, 수신되는 대역에 따라 각기 다른 인접채널신호를 트랩시키도록 트랩점(Trap point)이 자동조정되도록 함으로써, 인접채널방해 특성을 개선하는 수신대역별 자동조정식 트랩회로를 제공하는데 있다.Accordingly, an object of the present invention is that in the intermediate frequency signal output to the frequency converter of the tuner, the trap point is automatically adjusted to trap different adjacent channel signals according to the received band, thereby preventing adjacent channel interference. The present invention provides an automatically adjustable trap circuit for each reception band that improves characteristics.
상기한 목적을 달성하기 위한 기술적인 수단으로써, 본 발명의 수신대역별 자동조정식 트랩회로는 튜너내 주파수변환IC에서 출력되는 중간주파신호에 포함하는 인접채널신호를 트랩시키는 트랩회로부에 있어서, 상기 주파수변환IC의 출력라인상에 형성되고, VHF대역선택시에 VHF대역 음성인접채널신호에 해당하는 트랩점을 형성시키고, UHF선택시 세트내 UHF대역 선택전압(Bu)에 의해서 UHF대역 음성인접채널신호에 해당하는 트랩점을 형성시키는 제1트랩회로부와, 코일(AL:Axial Inductor)과 직렬로 접속되어 상기 제1트랩회로부에 병렬로 형성되며, VHF대역선택시에 VHF대역 영상인접채널신호에 해당하는 트랩점을 형성시키고, UHF선택시 세트내 UHF대역 선택전압(Bu)에 의해서 UHF대역 영상인접채널신호에 해당하는 트랩점을 형성시키는 제2트랩회로부를 구비함을 특징으로한다.As a technical means for achieving the above object, the reception band automatic adjustment trap circuit of the present invention is a trap circuit for trapping the adjacent channel signal included in the intermediate frequency signal output from the frequency conversion IC in the tuner, the frequency It is formed on the output line of the conversion IC, and forms a trap point corresponding to the VHF band negative adjacent channel signal at the time of VHF band selection, and UHF band negative adjacent channel signal by the UHF band selection voltage Bu in the set at the time of UHF selection. A first trap circuit portion for forming a trap point corresponding to the first trap circuit portion connected in series with a coil (AL: Axial Inductor) and formed in parallel with the first trap circuit portion, and corresponding to a VHF band image adjacent channel signal when the VHF band is selected; And a second trap circuit section for forming a trap point corresponding to the UHF band image adjacent channel signal by the UHF band selection voltage Bu in the set when the UHF is selected. To be characterized.
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 트랩회로도이다.2 is a trap circuit diagram according to the present invention.
제2도를 참조하면, 본 발명의 트랩회로부는 튜너내 주파수변환IC(10)에서 출력되는 중간주파신호에 포함하는 인접채널신호를 트랩시키는 트랩회로부이다.Referring to FIG. 2, the trap circuit part of the present invention is a trap circuit part for trapping adjacent channel signals included in the intermediate frequency signal output from the frequency conversion IC 10 in the tuner.
상기 트랩회로부는 상기 주파수변환IC(10)의 출력라인상에 형성되고, VHF대역선택시에 VHF대역 음성인접채널신호에 해당하는 트랩점을 형성시키고, UHF선택시 세트내 UHF대역 선택전압(Bu)에 의해서 UHF대역 음성인접채널신호에 해당하는 트랩점을 형성시키는 제1트랩회로부(25)와, 코일(AL:Axial Inductor)과 직렬로 접속되어 상기 제1트랩회로부(25)에 병렬로 형성되며, VHF대역선택시에 VHF대역 영상인접채널신호에 해당하는 트랩점을 형성시키고, UHF선택시 세트내 UHF대역 선택전압(Bu)에 의해서 UHF대역 영상인접채널신호에 해당하는 트랩점을 형성시키는 제2트랩회로부(35)로 구성한다.The trap circuit portion is formed on the output line of the frequency conversion IC 10, forms a trap point corresponding to the VHF band voice adjacent channel signal at the time of VHF band selection, and selects the UHF band selection voltage (Bu) in the set at the time of UHF selection. Is formed in parallel with the first trap circuit section 25, which is connected in series with the first trap circuit section 25 for forming a trap point corresponding to the UHF band voice adjacent channel signal, and a coil (AL). When the VHF band is selected, a trap point corresponding to the VHF band video adjacent channel signal is formed, and when the UHF is selected, a trap point corresponding to the UHF band video adjacent channel signal is formed by the UHF band selection voltage (Bu) in the set. 2nd trap circuit part 35 is comprised.
상기 제1트랩회로부(25)는 병렬접속된 콘덴서(C22) 및 코일(L21)에 콘덴서(C21)를 직렬로 접속하고, 상기 콘덴서(C22)에, 직렬접속한 콘덴서(C23)와 콘덴서(C24) 및 다이오드(D1)를 병렬로 접속하며, 상기 다이오드(D1)의 캐쏘드단자를 바이어스 저항(R1)으로 접지시키고, 상기 다이오드(D1)의 애노드단자에 저항(R0)을 통해서 UHF대역 선택 전압(Bu)이 제공되도록 구성한다.The first trap circuit section 25 connects the capacitor C21 in series with the capacitor C22 and the coil L21 connected in parallel, and the capacitor C23 and the capacitor C24 connected in series with the capacitor C22. ) And the diode D1 are connected in parallel, the cathode terminal of the diode D1 is grounded with a bias resistor R1, and the UHF band selection voltage is connected to the anode terminal of the diode D1 through the resistor R0. (Bu) is provided.
또한, 상기 제2트랩회로부(35)는 콘덴서(C31)과 코일(L31)을 병렬접속하고, 상기 콘덴서(C31)에, 직렬접속한 콘덴서(C32)와 콘덴서(C33) 및 다이오드(D2)를 병렬로 접속하며, 상기 다이오드(D2)의 캐쏘드단자를 바이어스 저항(R2)으로 접지시키고, 상기 다이오드(D2)의 애노드단자에 저항(R0)을 통해서 UHF대역 선택 전압(Bu)이 제공되도록 구성한다.In addition, the second trap circuit unit 35 connects the capacitor C31 and the coil L31 in parallel, and connects the capacitor C32, the capacitor C33, and the diode D2 connected in series with the capacitor C31. Connected in parallel, the cathode terminal of the diode D2 is grounded with a bias resistor R2, and the UHF band selection voltage Bu is provided to the anode terminal of the diode D2 through a resistor R0. do.
제3도는 제2도에 도시한 트랩회로의수신대역에 따른 등가회로도이고, 제4도는 본 발명에 의해 수신대역에 따라 트랩점 이동을 보이는 파형도이다.FIG. 3 is an equivalent circuit diagram according to the reception band of the trap circuit shown in FIG. 2, and FIG. 4 is a waveform diagram showing the trap point movement according to the reception band according to the present invention.
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.
본 발명은 VHF대역과 UHF대역을 동시에 수신할 수 있도록 되는 튜너에 있어서, 상기 튜너에 포함되는 주파수변환IC(10)에서 출력되는 중간주파신호에 포함되는 인접채널신호를 수신대역(VHF대역 또는 UHF대역)에 따라서 각기 주파수가 다른 인접채널신호를 UHF대역을 선택하는 경우에 세트에서 발생되는 UHF대역 선택전압을 이용함으로써, 수신대역별로 달라지는 인접채널신호에 해당하는 트랩점을 형성하도록 한 것이다.The present invention provides a tuner capable of simultaneously receiving a VHF band and a UHF band, wherein the adjacent channel signal included in the intermediate frequency signal output from the frequency conversion IC 10 included in the tuner is a reception band (VHF band or UHF band). In the case of selecting the UHF band for adjacent channel signals having different frequencies according to the band), a trap point corresponding to the adjacent channel signal that varies for each reception band is formed by using the UHF band selection voltage generated in the set.
제2도를 참조하면, 수신대역이 VHF대역인 경우에는 UHF대역 선택전압(Bu)이 도통전압 이하이므로, 제1, 2트랩회로부(25,35)내 다이오드(D1,D2)가 차단되어 VHF대역 수신시의 트랩회로는 제3도(a)와 같이 된다.Referring to FIG. 2, when the reception band is the VHF band, since the UHF band selection voltage Bu is less than or equal to the conduction voltage, the diodes D1 and D2 in the first and second trap circuit sections 25 and 35 are cut off, and thus the VHF band is VHF. The trap circuit at the time of band reception is as shown in FIG.
상기 제3도(a)의 제1, 2 트랩회로부(25,35)는 소망하는 채널의 영상중간주파수(PIF)가 38.8[MHz]이고 그 음성중간주파수(SIF)가 33.4[MHz]인 경우에 있어서, 제4도에 도시된 바와 같이 제1트랩회로부(25)내 콘덴서(C21)(C22)와 코일(L21)에 의해서 트랩포인트(VTP1)가 형성되고, 이 트랩포인트(VTP1)가 음성중간주파수인 40.4[MHz]에 해당되어 음성중간주파수(S)인 40.4[MHz]가 트랩되며, 또한 제2트랩회로부(35)내 콘덴서(C31)와 코일(L31)에 의해서 트랩포인트(VTP2)가 형성되고, 이 트랩포인트(VTP2)가 영상중간주파수인 31.9[MHz]에 해당되어 음성중간주파수(S)인 31.9[MHz]가 트랩되는 것이다.The first and second trap circuits 25 and 35 of FIG. 3 (a) have an image intermediate frequency (PIF) of 38.8 [MHz] and a voice intermediate frequency (SIF) of 33.4 [MHz]. In FIG. 4, as shown in FIG. 4, a trap point VTP1 is formed by the capacitors C21 and C22 and the coil L21 in the first trap circuit section 25, and the trap point VTP1 is negative. 40.4 [MHz], which is the voice intermediate frequency (S), is trapped corresponding to the intermediate frequency of 40.4 [MHz], and the trap point (VTP2) is formed by the capacitor C31 and the coil L31 in the second trap circuit unit 35. The trap point VTP2 corresponds to 31.9 [MHz], which is the video intermediate frequency, and 31.9 [MHz], which is the voice intermediate frequency (S), is trapped.
한편, 수신대역이 UHF대역인 경우에는 UHF대역 선택전압(Bu)이 도통전압 이상이므로, 제1, 2트랩회로부(25,35)내 다이오드(D1,D2)가 도통되어 UHF대역 수신시의 트랩회로는 제3도(b)와 같이 된다.On the other hand, in the case where the reception band is the UHF band, since the UHF band selection voltage Bu is equal to or greater than the conduction voltage, the diodes D1 and D2 in the first and second trap circuit sections 25 and 35 are turned on to trap the UHF band. The circuit is as shown in FIG. 3 (b).
상기 제3도(b)의 제1, 2트랩회로부(25,35)는 소망하는 채널의 영상중간주파수(PIF)가 38.8[MHz]이고 그 음성중간주파수(SIF)가 33.4[MHz]인 경우에, 제4도에 도시된 바와 같이 제1트랩회로부(25)내 콘덴서(C21)(C22)(C23)(C24)와 코일(L21)에 의해서 트랩포인트(UTP1)가 형성되고, 이 트랩포인트(UTP1)가 음성중간주파수인 41.4[MHz]에 해당되어 음성중간주파수인 41.4[MHz]가 트랩되며, 또한 제2트랩회로부(35)내 콘덴서(C31)(C32)(C33)와 코일(L31)에 의해서 트랩포인트(UTP2)가 형성되고, 이 트랩포인트(UTP2)가 영상중간주파수인 30.9[MHz]에 해당되어 음성중간주파수인 30.9[MHz]가 트랩되는 것이다.In the first and second trap circuits 25 and 35 of FIG. 3 (b), the image intermediate frequency (PIF) of the desired channel is 38.8 MHz and the audio intermediate frequency (SIF) is 33.4 [MHz]. As shown in FIG. 4, the trap point UTP1 is formed by the capacitors C21, C22, C23, C24 and the coil L21 in the first trap circuit section 25. (UTP1) corresponds to 41.4 [MHz], which is the voice intermediate frequency, and 41.4 [MHz], which is the voice intermediate frequency, is trapped. Also, the capacitors C31, C32, C33 and coil L31 in the second trap circuit section 35 are trapped. The trap point UTP2 is formed, and the trap point UTP2 corresponds to 30.9 [MHz] which is an image intermediate frequency, and 30.9 [MHz] which is an audio intermediate frequency is trapped.
상기와 같이 VHF대역 또는 UHF대역 등 수신하는 대역에 따라서 인접채널의 영상 및 음성중간주파수를 트랩시키는 트랩포인트가 각각 자동이동됨이 제4도에 나타나 있으며, 이는 실험을 통한 파형측정결과를 보이는 것이다.As shown in FIG. 4, the trap points for trapping the video and audio intermediate frequencies of adjacent channels are automatically moved according to the received bands such as the VHF band or the UHF band, respectively. This shows waveform measurement results through experiments. .
상술한 바와 같이, 본 발명은 튜너의 주파수변환부에서 출력되는 중간주파신호에 있어서, 수신되는 대역에 따라 각기 다른 인접채널신호를 트랩시키도록 트랩점(Trap point)이 자동조정되도록 함으로써, 인접채널방해 특성을 개선하는 특별한 효과가 있는 것이다.As described above, in the present invention, in the intermediate frequency signal output from the frequency converter of the tuner, a trap point is automatically adjusted so as to trap different adjacent channel signals according to the received band. There is a special effect to improve the disturbance characteristics.
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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950044674A KR0158598B1 (en) | 1995-11-29 | 1995-11-29 | Receiving band width automatic control type trap circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950044674A KR0158598B1 (en) | 1995-11-29 | 1995-11-29 | Receiving band width automatic control type trap circuit |
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| KR970031277A KR970031277A (en) | 1997-06-26 |
| KR0158598B1 true KR0158598B1 (en) | 1999-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1019950044674A KR0158598B1 (en) | 1995-11-29 | 1995-11-29 | Receiving band width automatic control type trap circuit |
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| KR (1) | KR0158598B1 (en) |
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1995
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