KR940004547Y1 - Fm trap switching circuit of electronic tuner - Google Patents

Fm trap switching circuit of electronic tuner Download PDF

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Publication number
KR940004547Y1
KR940004547Y1 KR92007282U KR920007282U KR940004547Y1 KR 940004547 Y1 KR940004547 Y1 KR 940004547Y1 KR 92007282 U KR92007282 U KR 92007282U KR 920007282 U KR920007282 U KR 920007282U KR 940004547 Y1 KR940004547 Y1 KR 940004547Y1
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South Korea
Prior art keywords
unit
trap
switching
signal
tuner
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KR92007282U
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Korean (ko)
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KR930024504U (en
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박기준
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황선두
삼성전기 주식회사
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
    • H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
    • H03J5/244—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection using electronic means
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/16—Tuning without displacement of reactive element, e.g. by varying permeability
    • H03J3/18—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance
    • H03J3/185—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance with varactors, i.e. voltage variable reactive diodes
    • 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

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

내용 없음.No content.

Description

전자동조 튜너의 FM트랩 스위칭 회로FM Trap Switching Circuit of Fully Tuned Tuner

제1도는 본 고안의 회로도.1 is a circuit diagram of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

10 : 튜너부 11 : 입력 필터부10 tuner part 11 input filter part

12 : RF 동조부 13 : 믹서부12: RF tuning unit 13: mixer unit

14 : 발진부 15 : PLL부14: oscillation unit 15: PLL unit

16 : FM 트랩부 20 : 세트부16: FM trap section 20: set section

21 : 마이콤 22 : 스위칭부21: microcomputer 22: switching unit

23 : 세트전원부 D1: 스위칭 다이오드23: set power supply unit D 1 : switching diode

C1, C2:콘덴서 L1: 코일C 1 , C 2 : Condenser L 1 : Coil

R1-R4: 저항R 1 -R 4 : Resistance

본 고안은 에어 TV 방송 채널중 FM 채널에 인접한 6채널 수신시 방해파로 작용하는 FM 주파수를 트랩시키기 위한 전자동조 튜너의 FM 트랩 스위칭회로에 관한 것이다.The present invention relates to an FM trap switching circuit of an electronically tuned tuner for trapping an FM frequency acting as a disturbing wave when receiving six channels adjacent to an FM channel among air TV broadcasting channels.

에어방송을 수신하기 위한 VHF 튜너는 채널2-채널6을 커버하는 VHF 로우밴드와 채널7-채널13을 커버하는 VHF 하이밴드로 나누어서 에어방송 신호를 튜닝하게 된다.The VHF tuner for receiving air broadcasting tunes the air broadcasting signal by dividing it into a VHF low band covering channel 2-channel 6 and a VHF high band covering channel 7-channel 13.

상기 VHF 로우밴드는 54-88MHz로써 채널2는 54-60MHz, 채널 3은 60-66MHz, 채널 4는 66-72MHz, 채널5는 76-82MHz, 채널 6은 82-88MHz의 주파수 범위를 갖는다.The VHF lowband is 54-88 MHz, with channel 2 having 54-60 MHz, channel 3 having 60-66 MHz, channel 4 having 66-72 MHz, channel 5 having 76-82 MHz, and channel 6 having 82-88 MHz.

그런데 채널6은 FM밴드(88-108MHZ)와 인접하고 있기 때문에, 채널6 선택시에는 FM밴드의 신호를 트랩시켜 주어야 한다.However, since channel 6 is adjacent to the FM band (88-108MHZ), when the channel 6 is selected, the signal of the FM band should be trapped.

본 고안은 6채널 선택시 RF 동조단으로 입력되는 FM 신호를 선택적으로 트랩시켜 FM 신호에 따른 TV 방송수신방해 문제를 해결할 수 있는 전자동조 튜너의 FM 트랩스위칭 회로를 제공하는데 목적이 있다.The present invention aims to provide an FM trap switching circuit of a fully tuned tuner that can solve the problem of TV broadcast reception interference by selectively trapping the FM signal input to the RF tuning stage when selecting 6 channels.

이하 첨부한 도면을 참고로하여 본고안을 설명하면 다음과 같다.Hereinafter, the present invention will be described with reference to the accompanying drawings.

제1도는 본 고안의 회로구성도로써, 참조부호 10은 튜너부를 참고부호 20은 세트부를 나타내고 있다.1 is a circuit diagram of the present invention, and reference numeral 10 denotes a tuner portion and reference numeral 20 denotes a set portion.

상기 튜너부(10)는 RF 입력신호를 필터링하는 입력필터부(11)와, FM 주파수 대역을 제거하기 위한 FM 트랩부(16)와, 선택된 채널 주파수 대역의 RF 신호만 동조하는 RF 동조부(12)와, 발진부(14)의 발진신호로 RF 동조된 신호를 믹싱하여 IF 신호를 만들어 내는 믹서부(13) 및 PLL부(15)를 포함한다.The tuner unit 10 includes an input filter unit 11 for filtering an RF input signal, an FM trap unit 16 for removing an FM frequency band, and an RF tuning unit for tuning only an RF signal of a selected channel frequency band ( 12) and a mixer section 13 and a PLL section 15 for generating an IF signal by mixing an RF tuned signal with the oscillation signal of the oscillator 14.

상기 입력필터부(11)와 RF 동조부(12) 사이에 설치되는 FM 트랩부(16)는 입력필터부(11)는 거친 RF 신호가 코일(L1) 및 콘덴서(C1)의 병렬회로를 통하거나 또는 콘덴서(C2) 및 스위칭 다이오드(D1)의 직렬회로를 통하여 RF 동조부(12)로 제공되게 구성한다.In the FM trap unit 16 installed between the input filter unit 11 and the RF tuning unit 12, the input filter unit 11 has a coarse RF signal in parallel circuit of the coil L 1 and the capacitor C 1 . It is configured to be provided to the RF tuning unit 12 through or through a series circuit of the capacitor (C 2 ) and the switching diode (D 1 ).

상기 스위칭 다이오드(D1)의 콘덴서(C2)와 연결된 애노드측에는 저항(R1, R2)을 통한 VB전압이 공급되게 연결하고, 스위칭 다이오드(D1)의 케소드측에는 저항(R3, R4)을 통한 세트부(20)의 스위치부(22)의 출력전압이 공급되게 연결한다.The anode side connected to the capacitor C 2 of the switching diode D 1 is connected to supply the V B voltage through the resistors R 1 and R 2 , and the resistor R 3 on the cathode side of the switching diode D 1 . , R 4 is connected so that the output voltage of the switch unit 22 of the set unit 20 is supplied.

한편, 세트부(20)는 앞에서 언급한 스위칭부(22)와, 튜너부(10)의 PLL부(15)의 6채널 선택전압을 인식하여 스위치부(22)를 제어하는 마이콤(21)과, 상기 스위치부(22)를 통하여 FM 트랩부(16)에 스위치 전압을 공급하는 세트 전원부(23)를 포함한다.On the other hand, the set unit 20 is the switching unit 22 and the microcomputer 21 for controlling the switch unit 22 by recognizing the six-channel selection voltage of the PLL unit 15 of the tuner unit 10 and And a set power supply unit 23 for supplying a switch voltage to the FM trap unit 16 through the switch unit 22.

이와같은 구성된 본 고안의 작용 및 효과를 설명하면 다음과 같다.Referring to the operation and effects of the present invention configured as described above are as follows.

제1도에서, 에어 TV 방송의 RF 신호는 튜너부(10)의 입력필터부(11)에서 필터링되어 FM 트랩부(16)를 거쳐 RF 동조부(12)에 입력된다.In FIG. 1, the RF signal of the air TV broadcast is filtered by the input filter unit 11 of the tuner unit 10 and input to the RF tuning unit 12 via the FM trap unit 16.

이때 세트부(20)의 스위치부(22)의 출력을 고려하지 않는다면 FM 트랩부(16)의 스위칭 다이오드(D1)는 VB전압에 의해 온되는 상태이므로 입력필터부(11)를 거친 RF 신호는 콘덴서(C2)와 스위칭 다이오드(D1)를 거쳐 그대로 RF 동조부(12)에 전달된다.In this case, if the output of the switch unit 22 of the set unit 20 is not considered, the switching diode D 1 of the FM trap unit 16 is turned on by the V B voltage and thus passes through the input filter unit 11. The signal is transmitted to the RF tuning unit 12 as it is through the capacitor C 2 and the switching diode D 1 .

RF 동조부(12)에서 동조된 해당채널 대역의 RF 신호는 발진부(14)의 발진 주파수에 믹싱되어 IF 신호로 변환 출력된다.The RF signal of the corresponding channel band tuned by the RF tuner 12 is mixed with the oscillation frequency of the oscillator 14 and converted into an IF signal.

한편 발진부(14)의 선택 채널에 해당하는 발진주파수는 PLL부(15)를 거쳐 세트부(21)의 마이콤(21)에 입력된다. 이 마이콤(21)은 어떠한 채널이 선택되었는지를 판단하여 6채널 선택인 경우에는 스위치부(22)에 제어신호를 내보내 세트 전원부(23)의 세트 전원이 스위치부(22)를 통하여 튜너부(10)의 FM 트랩부(16)로 공급되게 한다.On the other hand, the oscillation frequency corresponding to the selected channel of the oscillator 14 is input to the microcomputer 21 of the set unit 21 via the PLL unit 15. The microcomputer 21 determines which channel is selected and, in the case of 6-channel selection, sends a control signal to the switch unit 22 so that the set power supply of the set power supply unit 23 passes through the tuner unit 10 through the switch unit 22. Is supplied to the FM trap section 16).

가령 6채널이외의 채널이 선택된 경우에는 세트부(20)의 스위치부(22)의 출력이 없으므로, 앞에서 기술한 바와같이 튜너부(10)의 FM 트랩부(16)는 트랩기능을 갖지 않고 입력필터부(11)의 RF 신호를 그대로 RF 동조부(12)로 전달하게 된다.For example, when a channel other than 6 channels is selected, there is no output of the switch unit 22 of the set unit 20. As described above, the FM trap unit 16 of the tuner unit 10 has no trap function and has no input function. The RF signal of the filter unit 11 is transmitted to the RF tuning unit 12 as it is.

그렇지만 세트부(20)의 마이콤(21)에 6채널 선택임을 인식하면 스위치부(22)로 제어하여 세트전원부(23)의 전원을 스위치부(22)를 통하여 튜너부(10)의 FM 트랩부(16)에 인가하게 된다.However, if the microcomputer 21 of the set unit 20 recognizes that the six channels are selected, it is controlled by the switch unit 22 to control the power of the set power source unit 23 through the switch unit 22. It is applied to (16).

이에따라 FM 트랩부(16)의 스위칭다이오드(D1)는 역 바이어스되어 오프상태로 되므로 입력필터부(11)를 거친 RF 신호중 FM 대역의 신호는 코일(L1) 및 콘덴서(C1)에 의한 트랩회로에서 트랩되므로 RF 동조부(12)에는 6채널 상측의 FM 신호가 제거된 에어 V RF 신호만 동조하게 된다.Accordingly, since the switching diode D 1 of the FM trap unit 16 is reverse biased to be turned off, the signal of the FM band of the RF signals passing through the input filter unit 11 is generated by the coil L 1 and the capacitor C 1 . Since the trap is trapped in the trap circuit, the RF tuner 12 tunes only the air V RF signal from which the FM signal of the six channels is removed.

이상에서 설명한 바와같은 본 고안은 6채널 선택여부를 마이콤에 의해 정확히 인식하고, 이러한 인식테이터로써 세트전원이 FM 트랩부에 스위칭 공급되게 하여, TV 방송채널에 대한 방해파의 영향을 배제시킬 수 있는 특유의 효과를 얻을 수 있다.As described above, the present invention accurately recognizes whether the six channels are selected by the microcomputer, and the set power is switched to the FM trap unit by the recognition data, thereby eliminating the influence of the interference wave on the TV broadcasting channel. The effect can be obtained.

Claims (2)

에어 TV 방송의 RF 입력신호가 입력필터부(11), FM트랩부(16), RF 동조부(12)를 거쳐 믹서부(13)에서 발진부의 발진신호로 믹싱된후 IF 신호로 출력되게 연결하고, PLL부(15)를 거친 상기 발진부(14)의 발진주파수로써 세트부(20)의 마이콤(21)이 6채널 선택을 인식하여 스위치부(22)를 통한 세트전원으로 FM 트랩부(16)가 온/오프스위칭 되게 연결하여 구성하는 것을 특징으로 하는 전자동조 튜너의 FM 트랩스위칭 회로.The RF input signal of the air TV broadcast is mixed with the oscillation signal of the oscillation unit in the mixer unit 13 through the input filter unit 11, the FM trap unit 16, and the RF tuning unit 12, and then outputted as an IF signal. In addition, the microcomputer 21 of the set unit 20 recognizes the six-channel selection as the oscillation frequency of the oscillator 14 that has passed through the PLL unit 15, and the FM trap unit 16 as the set power supply through the switch unit 22. FM trap switching circuit of a fully tuned tuner, characterized in that the () is configured to be connected on / off switching. 제1항에 있어서, 상기 FM 트랩부(16)는 RF 신호가 코일(L1), 콘덴서(C1)의 병렬회로와 콘덴서(C2), 스위칭다이오드(D1)의 직렬회로를 상기 스위칭 다이오드(D1)의 스위칭에 따라 선택적으로 통과하게 연결하고, 상기 스위칭다이오드(D1)의 애노드측과 캐소드측에는 각각 저항(R1, R2)을 통한 VB전원과 저항(R3, R4)을 통한 세트 전원이 인가되게 연결하여 구성하는 것을 특징으로 하는 전자 동조 튜너의 FM 트랩 스위칭회로.The method of claim 1, wherein the FM trap unit 16 is the RF signal switching the parallel circuit of the coil (L 1 ), condenser (C 1 ) and the series circuit of the condenser (C 2 ), switching diode (D 1 ) a diode (D 1) selectively passes the connection according to the switching, the switching diode (D 1) the anode-side and each side of the cathode resistance (R 1, R 2) V B power supply and the resistor with the (R 3, and the R 4 ) FM trap switching circuit of the electronic tuning tuner, characterized in that the configuration is connected to the set power applied through.
KR92007282U 1992-04-30 1992-04-30 Fm trap switching circuit of electronic tuner KR940004547Y1 (en)

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Application Number Priority Date Filing Date Title
KR92007282U KR940004547Y1 (en) 1992-04-30 1992-04-30 Fm trap switching circuit of electronic tuner

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KR930024504U KR930024504U (en) 1993-11-27
KR940004547Y1 true KR940004547Y1 (en) 1994-07-07

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