KR910008133B1 - Single tuner circuit for all band receiver input data display system and method for transmitting and receiving remocon - Google Patents

Single tuner circuit for all band receiver input data display system and method for transmitting and receiving remocon Download PDF

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Publication number
KR910008133B1
KR910008133B1 KR1019890015265A KR890015265A KR910008133B1 KR 910008133 B1 KR910008133 B1 KR 910008133B1 KR 1019890015265 A KR1019890015265 A KR 1019890015265A KR 890015265 A KR890015265 A KR 890015265A KR 910008133 B1 KR910008133 B1 KR 910008133B1
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South Korea
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tuner
uhf
signal
vhf
receiving
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KR1019890015265A
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Korean (ko)
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KR910008949A (en
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이기룡
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삼성전기 주식회사
서주인
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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

Abstract

A tuning circuit is capable of receiving UHF and VHF band television signals by using one UHF tuner. The UHF RF signal is directly provided to an UHF tuner (100). The VHF RF signal is mixed with the first and second local oscillation frequencies by two mixers (31,33).

Description

올밴드 수신용 단일튜너회로Single tuner circuit for all-band reception

제1도는 종래의 튜너의 블록다이어그램.1 is a block diagram of a conventional tuner.

제2도는 본 발명 튜너의 블록다이어그램.2 is a block diagram of the tuner of the present invention.

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

27 : IF 증폭기 28 : IF 동조기27: IF amplifier 28: IF tuner

31 : 제1혼합기 33 : 제2혼합기31: first mixer 33: second mixer

32 : 제1국부발진기 34 : 제2국부발진기32: first local oscillator 34: second local oscillator

100 : UHF 튜너100: UHF Tuner

본 발명은 단일의 UHF 튜너로 TV 방송의 전대역을 커버할 수 있는 올 밴드(ALL BAND) 수신용 단일 튜너회로에 관한 것이다. TV 방송신호는 크게 VHF대와 UHF대로 구분되며 이들 밴드폭은 각각 55-470MHz와 470-887MHz로 구분된다. 따라서 TV 방송을 수신하기 위해서는 기계식 튜너인 경우 VHF 튜너와 UHF 튜너를 각각 별도로 구비해야하며, 전자식튜너인 경우 가변용량다이오드를 이용하여 수신대역을 절환할 수 있지만 그 주파수변환범위가 좁기 때문에 VHF 밴드에서는 2-3개의 밴드로 나누고 UHF 밴드에서는 3-4개의 밴드로 나누어 별도의 절환회로로써 희망대역을 선정하게 된다.The present invention relates to a single tuner circuit for all band reception that can cover the full range of TV broadcast with a single UHF tuner. TV broadcast signals are largely divided into VHF bands and UHF bands, and their bandwidths are divided into 55-470 MHz and 470-887 MHz, respectively. Therefore, in order to receive a TV broadcast, a mechanical tuner must be separately equipped with a VHF tuner and a UHF tuner. For an electronic tuner, the reception band can be switched using a variable capacitance diode, but the VHF band has a narrow frequency conversion range. The band is divided into 2-3 bands and the UHF band is divided into 3-4 bands to select a desired band as a separate switching circuit.

제1도는 종래의 전자식튜너의 블록다이어그램으로서, 이를 살펴보면, UHF 튜너부(100)와 VHF 튜너부(200)가 각각 별도로 분리되어 구성되고 있음을 알 수 있다.FIG. 1 is a block diagram of a conventional electronic tuner. Looking at this, it can be seen that the UHF tuner 100 and the VHF tuner 200 are separately configured.

여기에서 UHF 선국시 UHF RF 입력신호는 대역통과여파기(10)와 가변입력동조기(11)와 RF 증폭기(12)와 가변단간동조기(13)을 통하여, 발진동조기(14)에 의한 국부발진기(15)의 발진주파수와 혼합기(16)에서 혼합된 후, UHF 수신시에는 증폭기로서의 기능을 하는 VHF 튜너(200)내의 혼합기(26)와 IF 증폭기(27)와 IF 동조기(28)를 통하여 UHF IF 신호로 출력된다.Here, the UHF RF input signal at the time of UHF tuning is transmitted through the band pass filter 10, the variable input synchronizer 11, the RF amplifier 12, and the variable stage interlocker 13, and the local oscillator 15 by the oscillator 14. UHF IF signal after mixing in oscillation frequency of mixer 16 and mixer 16 and then mixer 26 and IF amplifier 27 and IF tuner 28 in VHF tuner 200 functioning as an amplifier when receiving UHF. Is output.

또한, VHF 선국시 VHF RF 신호는 대역통과여파기(20)와 가변입력동조기(21)와, RF 증폭기(22)와 가변단간동조기(23)을 통하여, 발진동조기(24)에 의한 국부발진기(25)의 발진주파수와 혼합기(26)에서 혼합된 후, IF 증폭기(27)와 IF 동조기(28)를 통하여 VHF IF 신호로 출력된다.The VHF RF signal is also transmitted through the band pass filter 20, the variable input tuner 21, the RF amplifier 22, and the variable stage interlocker 23, and the local oscillator 25 by the oscillator 24. After mixing in the oscillation frequency and the mixer (26), it is output as a VHF IF signal through the IF amplifier 27 and the IF tuner (28).

따라서 이와 같은 종래의 튜너에서는 별도의 기능을 가지는 UHF 및 VHF 튜너를 각각 설치하게되므로 튜너회로구성의 복잡화에 따른 튜너사이즈의 증가 및 원가상승을 가져오게 된다. 또한, UHF 선국시 혼합기(16)에서 출력되는 IF 주파수신호가 VHF용 혼합기(26)에서 증폭된 후 재차 IF증폭기(27)에서 증폭되므로 UHF와 VHF의 IF 신호의 크기가 다르게 나타나는 문제점이 있게된다.Therefore, in the conventional tuner, since the UHF and VHF tuners having separate functions are installed, the tuner size increases and the cost increases due to the complexity of the tuner circuit configuration. In addition, since the IF frequency signal output from the mixer 16 at the time of UHF tuning is amplified by the IF amplifier 27 after being amplified by the mixer 26 for VHF, there is a problem that the magnitudes of the IF signals of the UHF and VHF are different. .

본 발명은 이와 같은 문제점을 해결하기위한 것으로 기존의 UHF 튜너하나만을 이용하여 UHF 밴드의 TV 방송신호는 물론 VHF 밴드의 TV 방송신호를 수신할 수 있는 컴팩트한 올 밴드 수신용 단일튜너회로를 제공하는데 그 목적이 있다.The present invention is to solve the above problems and to provide a compact all-tuner single tuner circuit for receiving a TV broadcast signal of the VHF band as well as the TV broadcast signal of the UHF band using only one conventional UHF tuner. The purpose is.

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

제2도에서 도시하고 있는 바와 같이, UHF RF 신호는 스위치(SW1)의 단자(a)를 통하여 그대로 UHF 튜너(100)로 입력되게 연결하고, VHF RF 신호는 제1, 2차 혼합기에서 각각의 1, 2차국부발진기(32,34)의 각 발진주파수(940MHz,1355MHH)로 혼합된 후 스위치(SW1)의 단자(b)를 통하여 상기 UHF 튜너(100)로 입력되게 연결하고, 상기 UHF 튜너(100)에서 출력되는 IF 신호는 IF 증폭기(27)와 IF 동조기(28)를 통하여 IF 신호로 출력되게 연결하여 구성한다.As shown in FIG. 2, the UHF RF signal is connected to the UHF tuner 100 as it is through the terminal a of the switch SW 1 , and the VHF RF signal is connected to each of the first and second mixers. After mixing at each oscillation frequency (940MHz, 1355MHH) of the primary and secondary local oscillator (32,34) of the switch (SW 1 ) through the terminal (b) of the connection to be connected to the UHF tuner 100, The IF signal output from the UHF tuner 100 is configured to be connected to the IF signal output through the IF amplifier 27 and the IF tuner 28.

이와 같이 된 본 발명의 작용 및 효과를 설명하면 다음과 같다.Referring to the operation and effects of the present invention as described above are as follows.

제2도에서, UHF 선국시 470-887MHz의 UHF RF 입력신호는 스위치(SW1)의 단자(a)를 통하여 기존의 UHF 튜너(100)로 입력되고, 상기 UHF 튜너(100)의 혼합출력신호는 IF 증폭기(27)와 IF 동조기(28)를 통하여 UHF IF 신호로 출력된다. 이는 기존의 UHF 튜너에서의 동작과 동일하다.2, the UHF RF input signal of 470-887 MHz is input to the existing UHF tuner 100 through the terminal a of the switch SW 1 and the mixed output signal of the UHF tuner 100 is shown in FIG. Is output as a UHF IF signal through the IF amplifier 27 and the IF tuner 28. This is the same operation as the existing UHF tuner.

한편, VHF 선국시에는 55-470MHz의 VHF RF 신호가 제1혼합기(31)에서 제1국부발진기(32)의 발진주파수(940MHz)와 혼합되어 885-470MHz의 주파수신호로 변환된다. 이 신호는 영상주파수와 음성주파수가 반전된 상태로 되며, 다시 제2혼합기(33)에서 제2국부발진기(34)의 발진주파수(1355MHz)와 혼합되면 470-885MHz 즉, UHF의 RF 신호와 같은 대역의 주파수로 변환된다.On the other hand, during VHF tuning, the VHF RF signal of 55-470 MHz is mixed with the oscillation frequency (940 MHz) of the first local oscillator 32 in the first mixer 31 and converted into a frequency signal of 885-470 MHz. This signal is inverted in the video frequency and the audio frequency, and when mixed again with the oscillation frequency (1355MHz) of the second local oscillator 34 in the second mixer 33, 470-885MHz, that is, the same as the RF signal of UHF Converted to the frequency of the band.

이러한 신호는 스위치(SW1)의 단자(b)를 통하여 UHF 튜너(100)를 거친후 IF 증폭기(27)와 IF 동조기(28)를 통하여 VHF IF 신호로 출력되게 된다.Such a signal passes through the UHF tuner 100 through the terminal b of the switch SW 1 and is then output as a VHF IF signal through the IF amplifier 27 and the IF tuner 28.

이상에서 설명한 바와 같은 본 발명은 기존의 UHF 튜너의 전단에 스위치절환회로와 간단한 VHF 믹싱회로를 추가하여 주는 것으로, 별도의 VHF 튜너회로없이 VHF/UHF 공용 튜너를 구성할 수 있게되므로 튜너사이즈의 축소와 원가절감이 가능하게 된다. 또한 기존의 튜너에서 UHF IF 신호의 중복증폭에 따른 UHF IF 신호와 VHF IF 신호의 출력레벨의 차가 없어지게 되므로, IF 후단회로에의 IF 신호입력특성을 안정하게 가져갈 수 있는 특유의 효과도 나타나게 된다.As described above, the present invention adds a switch switching circuit and a simple VHF mixing circuit to the front end of the existing UHF tuner. Thus, the VHF / UHF common tuner can be configured without a separate VHF tuner circuit, thereby reducing the tuner size. And cost reduction is possible. In addition, the difference between the output level of the UHF IF signal and the VHF IF signal due to the overlapping amplification of the UHF IF signal in the existing tuner is eliminated. Therefore, a unique effect of stably bringing the IF signal input characteristic to the IF post-stage circuit is shown. .

Claims (1)

UHF/VHF 튜너에 있어서, UHF RF 신호는 스위치(SW1)의 단자(a)를 통하여 그대로 UHF 튜너(100)로 입력되게 연결하고, VHF RF 신호는 제1, 2혼합기(31,33)에서 각각 제1, 2국부 발진기(32,34)의 출력으로 혼합된 후, 스위치(SW1)의 단자(b)를 통하여 상기 UHF 튜너(100)로 입력되게 연결하여 구성하는 것을 특징으로 하는 올밴드 수신용 단일튜너회로.In the UHF / VHF tuner, the UHF RF signal is connected to the UHF tuner 100 as it is through the terminal (a) of the switch SW 1 , and the VHF RF signal is connected to the first and second mixers 31 and 33. After mixing to the output of the first and second local oscillator (32, 34), respectively, and connected to the input via the terminal (b) of the switch (SW 1 ) to the UHF tuner (100) Receive single tuner circuit.
KR1019890015265A 1989-10-24 1989-10-24 Single tuner circuit for all band receiver input data display system and method for transmitting and receiving remocon KR910008133B1 (en)

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KR1019890015265A KR910008133B1 (en) 1989-10-24 1989-10-24 Single tuner circuit for all band receiver input data display system and method for transmitting and receiving remocon

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KR1019890015265A KR910008133B1 (en) 1989-10-24 1989-10-24 Single tuner circuit for all band receiver input data display system and method for transmitting and receiving remocon

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KR910008133B1 true KR910008133B1 (en) 1991-10-10

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