KR960007151Y1 - Tuner having distributor - Google Patents

Tuner having distributor Download PDF

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Publication number
KR960007151Y1
KR960007151Y1 KR2019930022519U KR930022519U KR960007151Y1 KR 960007151 Y1 KR960007151 Y1 KR 960007151Y1 KR 2019930022519 U KR2019930022519 U KR 2019930022519U KR 930022519 U KR930022519 U KR 930022519U KR 960007151 Y1 KR960007151 Y1 KR 960007151Y1
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South Korea
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frequency signal
high frequency
signal
amplifier
intermediate frequency
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KR2019930022519U
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Korean (ko)
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KR950012815U (en
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최규환
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삼성전기 주식회사
윤종용
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Priority to KR2019930022519U priority Critical patent/KR960007151Y1/en
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    • 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
    • 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
    • H03J1/06—Driving or adjusting arrangements; combined with other driving or adjusting arrangements, e.g. of gain control
    • H03J1/16—Single control means independently performing two or more functions
    • 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
    • H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
    • H04N5/45—Picture in picture, e.g. displaying simultaneously another television channel in a region of the screen
    • 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
    • H04N5/52—Automatic gain control

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

내용 없음No content

Description

분배기 내장튜너Splitter Built-in Tuner

제1도는 종래의 분배기 외장 튜너의 구성을 보여주는 블럭도이고1 is a block diagram showing the configuration of a conventional distributor exterior tuner.

제2도는 본 고안에 의한 분배기 내장 튜너의 구성을 보여주는 블럭도이다.2 is a block diagram showing the configuration of a divider built-in tuner according to the present invention.

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

201 : 감쇄기202 : 자동이득제어기201: attenuator 202: automatic gain controller

203 : 고주파 증폭기204 : 분배기203: high frequency amplifier 204: divider

205 : 입력동조필터206, 211 : 믹서205: input tuning filter 206, 211: mixer

207 : 가변발진기208, 210 : 단간동조필터207 variable oscillator 208, 210 inter-stage tuning filter

209, 213 : 중간주파증폭기212 : 국부발진기209, 213: medium frequency amplifier 212: local oscillator

200 : 분배기 내장튜너40 : PIP용 튜너200: Splitter built-in tuner 40: PIP tuner

본 고안은 텔레비젼에 구비되는 튜너에 관한 것으로, 특히 튜터에 분배기를 내장하고 분배기 앞단에 감쇄기 및 고주파증폭기를 설치함으로써 NF(잡음지수)특성을 향상시키기 위한 분배기 내장튜너에 관한 것이다.The present invention relates to a tuner provided in a television, and more particularly, to a tuner built-in tuner for improving NF characteristics by installing a divider in a tutor and providing an attenuator and a high frequency amplifier in front of the dispenser.

일반적으로, 텔레비젼에 구비되어 있는 에어방송수신시스템은 분배기를 내장하지 않고, 안테나와 연결하여, 안테나로 수신횐 고주파신호를 각각 해당 튜너로 입력하도록 구성되어 있다.In general, an air broadcasting reception system provided in a television is configured to connect a radio antenna and input a high frequency signal received by the antenna to a corresponding tuner without a built-in distributor.

특히, PIP(picture in picture)를 위한 튜너가 구비되는 경우, 분배기에서 PIP를 위한 고주파신호와 모화면을 위한 고주파신호를 분배하여, 각각 모화면용 튜너와 PIP용 튜너로 공급함으로써, PIP화면의 동시시청이 가능하게 된다.In particular, when a tuner for a picture in picture (PIP) is provided, a splitter distributes a high frequency signal for the PIP and a high frequency signal for the mother screen, and supplies them to the parent screen tuner and the PIP tuner, respectively, Simultaneous viewing is possible.

제1도는 종래의 분배기를 외장한 시스템의 블럭도로써, 안테나로 수신된 PIP용 튜너(40)와 모화면용튜너(100)로 분배하는 분배기(12)와, 상기 분배기(12)로부터 PIP용 고주파신호를 수신받는 PIP용 튜너(40)와, 상기 분배기(12)로부터 모화면용 고주파신호를 받아 중간주파신호로 변환하는 모화면용튜너(100)로 이루어지면, 상기 모화면용 튜너(100)는 상기 분배기(12)로부터 입력되는 모화면용 고주파신호를 하기 자동 이득제어기(13)으로부터 인가되는 자동이득제어전압(이하, 'AGC전압'이라함)(VAGC)에 의해 이득을 조절하는 감쇄기(14)와, 상기 감쇄기(14)로 부터 출력되는 일정한 이득을 갖는 고주파신호를 증폭하는 고주파증폭기(16)와 상기 고주파증폭기(16)에 의하여 증폭된 고주파신호를 입력동조하는 입력동조필터(18)와 상기 입력 동조필터(18)에서 입력동조된 고주파신호를 하기 가변발진기(22)로부터 입력되는 발진주파수를 믹서하여 제1중간주파(이하, IF)신호로 변환시키는 제1믹서(20)와, 선택된 채널에 따른 발진주파수를 상기 제1믹서(20)로 출력하는 가변발진기(22)와, 상기 제1믹서(20)로부터 출력된 제1IF신호를 단간동조하는 제1단간동조필터(24)와, 상기 제1단간동조필터(24)에 의하여 동조된 제1IF신호를 증폭하는 제1IF증폭기(26)와, 상기 제1IF증폭기(26)에 의하여 증폭된 제1IF신호를 다시 단간동조시키는 제2단간동조필터(28)와, 상기 제2단간동조필터(28)에 의하여 동조된 제1IF신호를 하기 국부발진기(32)로부터 입력되는 국부발진주파수와 혼합하여 제2IF신호로 변환하는 제2믹서(30)와, 상기 제2믹서(30)로 소정의 국부발진주파수를 출력하는 국부발진기(32)와, 상기 제2믹서(30)로부터 출력되는 제2IF신호를 증폭하는 제2IF증폭기(34)와, 상기 제2믹서(30)로부터 출력되는 제2IF신호의 이득에 따른 AGC전압(VAGC)를 상기 감쇄기(14)로 인가하는 자동이득제어기(13)로 구성된다.FIG. 1 is a block diagram of a system in which a conventional distributor is installed. The distributor 12 distributes the PIP tuner 40 and the parent screen tuner 100 received by the antenna, and the PIP for the PIP. When the PIP tuner 40 receives the high frequency signal and the parent screen tuner 100 receives the high frequency signal for the parent screen from the splitter 12 and converts it into an intermediate frequency signal, the parent screen tuner 100 is used. ) Adjusts the gain by the automatic gain control voltage (hereinafter referred to as 'AGC voltage') (V AGC ) applied from the automatic gain controller 13 to the high frequency signal for the mother screen input from the divider 12. An input tuning filter for input tuning the attenuator 14, a high frequency amplifier 16 for amplifying a high frequency signal having a constant gain output from the attenuator 14, and a high frequency signal amplified by the high frequency amplifier 16 ( 18) and the input tuned by the input tuning filter 18 The first mixer 20 converts an oscillation frequency input from the variable oscillator 22 to a first intermediate frequency (hereinafter, referred to as IF) signal, and converts an oscillation frequency according to a selected channel into the first mixer. 20 by a variable oscillator 22 for outputting to the first stage, a first stage interpolation filter 24 for single-step tuning the first IF signal output from the first mixer 20, and the first inter-phase tuning filter 24. A first IF amplifier 26 for amplifying the tuned first IF signal, a second stage interpolation filter 28 for single-step tuning the first IF signal amplified by the first IF amplifier 26, and the second step interpolation A second mixer 30 for mixing the first IF signal tuned by the filter 28 with the local oscillation frequency input from the following local oscillator 32 and converting the second IF signal into a second IF signal; and the second mixer 30. Amplifying a local oscillator 32 for outputting a local oscillation frequency of the second and the second IF signal output from the second mixer 30 2IF consists of amplifier 34 and automatic gain controller 13 for applying the AGC voltage (V AGC) in accordance with the gain of the 2IF signal output from the second mixer 30 to the attenuator 14.

이와같이 구성되는 종래의 분배기를 튜너외부에 구비한 수신시스템은 분배기(12)에서 안테나로부터 직접 고주파신호로 수신받아, PIP용 튜너(40)와 모화면용 튜너(100)로 각각 분배하므로써, 상기 분배기(12)에서 발생한 신호의 로스(LOSS)성분이 그대로 상기 두 튜너로 이어지므로, 각각의 튜너부터 출력되는 중간주파신호가 열화되어 화질감도가 저하되는 문제점이 발생하였다.A receiving system having a conventional divider configured as described above, which is provided outside the tuner, receives the high frequency signal directly from the antenna in the divider 12 and distributes the splitter 12 to the tuner 40 for PIP and the parent screen tuner 100, respectively. Since the LOSS component of the signal generated in (12) is directly connected to the two tuners, the intermediate frequency signal outputted from each tuner is deteriorated, thereby degrading the image quality.

본 고안은 상기와 같은 문제점을 해결하기 위한 것으로, 그 목적은 분배기를 튜너의 감쇄기 및 고주파증폭기후단에 설치하여, 분배기에 발생한 고주파신호 이득손실을 보상하여, 잡음지수 및 화면감도특성을 개선하는 분배기 내장튜너를 제공함에 있다.The present invention has been made to solve the above problems, and its purpose is to provide a divider at the end of the tuner attenuator and the high frequency amplifier, to compensate for the high frequency signal gain loss generated in the divider, thereby improving the noise figure and the picture sensitivity characteristics. It provides a built-in tuner.

상기와 같은 목적을 달성하기 위한 기술적인 수단으로써, 본 고안은 안테나로 수신된 고주파신호를 중간주파신호로 변환하는 튜너에 있어서,As a technical means for achieving the above object, the present invention is a tuner for converting a high frequency signal received by an antenna into an intermediate frequency signal,

상기 안테나로부터 수신된 고주파신호레벨을 하기 자동이득제어전압에 따른 신호레벨로 조절하는 감쇄기와,An attenuator for adjusting the high frequency signal level received from the antenna to a signal level according to the following automatic gain control voltage;

상기 감쇄기로부터 출력되는 고주파신호를 소정레벨로 증폭하는 고주파증폭기와,A high frequency amplifier for amplifying a high frequency signal output from the attenuator to a predetermined level;

상기 고주파증폭기에 의해 증폭된 고주파신호를 분배하여 PIP용 고주파신호를 출력하고, 모화면용 고주파신호를 출력하는 분배기와,A divider for distributing a high frequency signal amplified by the high frequency amplifier, outputting a high frequency signal for PIP, and outputting a high frequency signal for a mother screen;

상기 분배기의 출력신호중 모화면용 고주파신호를 동조시키는 입력동조필터와,An input tuning filter for tuning a high frequency signal for a mother screen among the output signals of the distributor;

상기 입력동조필터로부터 입력되는 고주파신호를 가변발진주파수와 혼합하여 제1중간주파신호로 변환하는, 제1믹서와 가변발진기로 이루어진 제1주파수변화기와,A first frequency changer comprising a first mixer and a variable oscillator for converting a high frequency signal input from the input tuning filter into a first intermediate frequency signal by mixing with a variable oscillation frequency;

상기 제1주파수변환기로부터 출력되는 제1중간주파신호에 동조하는 제1단간동조필터와,A first inter-stage tuning filter for tuning to a first intermediate frequency signal output from said first frequency converter;

상기 제1단간동조필터로부터 출력되는 제1중간주파신호를 증폭하는 제1중간주파증폭기와,A first intermediate frequency amplifier for amplifying a first intermediate frequency signal output from the first stage interpolation filter;

상기 제1IF증폭기로부터 출력되는 제1중간주파신호에 동조하는 제2단간동조필터와,A second inter-phase tuning filter tuned to a first intermediate frequency signal output from the first IF amplifier,

상기 제2단간동조필터로부터 입력되는 제1중간주파신호를 국부발진주파수와 혼합하여 제2중간주파신호로 변환하는 제1믹서와 국부발진주파수로 이루어진 제2주파수변환기와,A second frequency converter comprising a first mixer and a local oscillation frequency, the first mixer converting the first intermediate frequency signal inputted from the second inter-phase tuning filter into a second intermediate frequency signal by mixing with a local oscillation frequency;

상기 제2주파수변환기로부터 출력된 제2중간주파신호를 증폭하는 제2중간주파증폭기와,A second intermediate frequency amplifier for amplifying a second intermediate frequency signal output from the second frequency converter;

상기 제2주파수변환기로부터 출력되는 제2중간주파신호의 신호레벨에 따른 자동이득제어전압을 상기 감쇄기로 출력하는 자동이득제어기를 구비함으로 특징으로 한다.And an automatic gain controller for outputting an automatic gain control voltage according to the signal level of the second intermediate frequency signal output from the second frequency converter to the attenuator.

이하 첨부한 도면을 참조하여 설명한다.It will be described below with reference to the accompanying drawings.

제2도는 본 고안에 의한 분배기 내장튜너의 구성을 보여주는 블럭도로써, 분배기를 내장한 모화면용 튜너(200)는 안테나로 수신된 고주파신호의 이득을 하기 자동이득제어기(202)로부터 인가되는 AGC전압(VAGC)에 따라 조절하는 감쇄기(201)와, 상기 감쇄기(201)로부터 입력되는 일정 레벨의 고주파신호를 증폭하는 고주파증폭기(203)와, 상기 고주파증폭기(203)로부터 출력되는 증폭된 고주파신호를 모환면용 고주파신호와 PIP용 고주파신호로 분배하는 분배기(204)와, 상기 분배기(204)로부터 분배된 고주파신호중 모화면용 고주파신호에 동조하는 입력동조필터(205)와, 상기 입력동조필터(205)에 의해 동조된 모화면용 고주파신호를 하기 가변발진기(207)로부터 인가되는 발진주파수와 혼합하는 제1믹서(206)와, 선택된 체널에 따라 가변발진되는 발진주파수를 상기 제1믹서(206)로 출력하는 가변발진기(207)와, 상기 제1믹서(206)로부터 출력되는 제1IF신호에 동조하는 제1단간종조필터(208)와, 상기 제1단간동조필터(208)로부터 출력된 제1IF신호를 증폭하는 제1IF증폭기(209)와, 상기 제1IF증폭기(209)에 의하여 증폭된 제1IF신호를 단간동조하는 제2단간동조필터(210)와, 상기 제2단간동조필터(210)로부터 출력되는 제1IF신호를 하기 국부발진기(212)로부터 입력되는 국부발진주파수와 혼합하여 제2IF신호로 변환하는 제2믹서(211)와, 상기 제1믹서(211)로 소정의 국부발진주파수를 출력하는 국부발진기(212)와, 상기 제2믹서(211)로부터 출력되는 제2IF신호를 증폭하는 제2IF증폭기(213)와, 상기 제2믹서(211)로부터 출력되는 제2IF신호의 레벨에 따른 AGC(VAGC)을 상기 감쇄기(201)로 인가하는 자동이득제어기(202)를 구비하고, 상기에서 미설명된 40은 분배기(204)에 의해 분배된 PIP용 고주파신호를 인가받아 중간주파신호로 분배하는 PIP용 튜너이다.Figure 2 is a block diagram showing the configuration of the divider built-in tuner according to the present invention, the parent screen tuner 200 with a divider is AGC applied from the automatic gain controller 202 to gain the high frequency signal received by the antenna An attenuator 201 adjusted according to the voltage V AGC , a high frequency amplifier 203 for amplifying a high frequency signal of a predetermined level input from the attenuator 201, and an amplified high frequency output from the high frequency amplifier 203. A divider 204 for distributing a signal into a high frequency signal for a cyclic plane and a high frequency signal for a PIP, an input tuning filter 205 for tuning to a high frequency signal for a mother screen among the high frequency signals distributed from the divider 204, and the input tuning The first mixer 206, which mixes the high frequency signal for the parent picture tuned by the filter 205 with the oscillation frequency applied from the variable oscillator 207, and the oscillation frequency variable oscillated according to the selected channel. A variable oscillator 207 output to the first mixer 206, a first inter-end modulation filter 208 for tuning to the first IF signal output from the first mixer 206, and the first inter-terminal tuning filter 208 A first IF amplifier 209 for amplifying the first IF signal outputted from the second IF signal, a second end tuning filter 210 for single step tuning of the first IF signal amplified by the first IF amplifier 209, and the second stage. A second mixer 211 for converting the first IF signal output from the tuning filter 210 into a second IF signal by mixing with the local oscillation frequency input from the following local oscillator 212 and the first mixer 211. A local oscillator 212 for outputting a local oscillation frequency of the second IF amplifier, a second IF amplifier 213 for amplifying a second IF signal output from the second mixer 211, and a second IF output from the second mixer 211. An automatic gain controller 202 for applying AGC (V AGC ) according to the level of the signal to the attenuator 201, which is not described above. Is a PIP tuner that receives the PIP high frequency signal distributed by the divider 204 and distributes the PIP high frequency signal.

상기 제2도의 구성에 의한 본 고안의 작용 및 효과를 상세하게 설명하면 다음과 같다.Referring to the operation and effects of the present invention by the configuration of Figure 2 in detail as follows.

감쇄기(201)는 자동이득제어기(202)로부터 인가되는 AGC전압에 따라 안테나로 수신된 고주파신호의 레벨을 소정레벨로 감쇄하고, 고주파증폭기(203)는 상기 감쇄기(201)로부터 출력되는 고주파신호를 하기 분배기(204)에서 발생하는 이득손실(예, 약5dB)을 보상하고, 신호대잡음비를 충분히 높일 수 있을 정도(약, 10dB정도)로 증폭한다.The attenuator 201 attenuates the level of the high frequency signal received by the antenna to a predetermined level according to the AGC voltage applied from the automatic gain controller 202, and the high frequency amplifier 203 receives the high frequency signal output from the attenuator 201. The gain loss (e.g., about 5 dB) generated by the divider 204 is compensated for, and amplified to a degree (about 10 dB) that can sufficiently increase the signal-to-noise ratio.

상기 고주파증폭기(203)에 의해 증폭된 고주파신호를 인가받은 분배기(204)는 입력된 고주파신호를 분배하여 PIP용 고주파신호는 PIP용 튜너(40)로 출력하고, 모화면용 고주파신호는 후단의 입력동조필터(208)로 출력한다. 이에 PIP용 튜너(40)는 입력된 PIP용 고주파신호를 중간주파신호로 변환하여 후단의 변조기(도시생략)으로 출력한다.The distributor 204 receiving the high frequency signal amplified by the high frequency amplifier 203 distributes the input high frequency signal, and outputs the high frequency signal for PIP to the tuner 40 for PIP, and the high frequency signal for the mother screen Output to the input tuning filter 208. Accordingly, the PIP tuner 40 converts the input high frequency signal for PIP into an intermediate frequency signal and outputs it to a modulator (not shown) at a later stage.

그리고, 상기 분배기(204)로부터 출력되는 모화면용 고주파신호는 입력동조필터(205)에 동조되어, 선택된 채널신호의 주파수대역만 제1믹서(206)로 입력된다. 제1믹서(206)는 선택된 체널에 따라 가변하는 발진주파수를 출력하는 가변발진기(207)로부터 입력되는 발진주파수와 상기 입력동조필터(205)로부터 입력되는 고주파신호를 혼합하고, 제1IF신호대역에 동조된 제1단간동조필터(208)는 상기 제1믹서(206)의 출력신호에서 잡음이 제거된 제1IF신호를 출력한다. 상기 제1IF신호는 제1IF증폭기(209)에서 증폭되고, 제2단간동조필터(210)에 단간동조되어 제2믹서(211)로 입력된다. 제2믹서(211)는 국부발진기(212)로부터 입력되는 국부발진주파수와 상기 제2단간동조필터(210)에 의해 동조된 제1IF신호를 혼합하여 제2IF신호로 변환시키고, 이 제2IF신호는 자동이득제어기(202)로 피드백되고, 또한 제2IF증폭기(213)로 출력된다. 상기 자동이득제어기(202)는 상기 제1IF신호의 레벨에 따라 감쇄기(201)로 인가할 자동이득제어전압(VAGC)를 결정하고, 상기 제2IF증폭기(213)는 상기 제2믹서(211)로부터 입력되는 제2IF신호를 증폭하여 튜너 후단에 연결되는 복조기(도시생략)로 출력한다.The high frequency signal for the mother screen output from the distributor 204 is tuned to the input tuning filter 205 so that only the frequency band of the selected channel signal is input to the first mixer 206. The first mixer 206 mixes the oscillation frequency input from the variable oscillator 207 for outputting the oscillation frequency variable according to the selected channel and the high frequency signal input from the input tuning filter 205, and the first IF signal band. The tuned first inter-stage tuning filter 208 outputs a first IF signal from which noise is removed from the output signal of the first mixer 206. The first IF signal is amplified by the first IF amplifier 209, and intermittently tuned to the second inter-stage tuning filter 210 and input to the second mixer 211. The second mixer 211 mixes the local oscillation frequency input from the local oscillator 212 and the first IF signal tuned by the second inter-stage tuning filter 210 to convert the second IF signal into a second IF signal. It is fed back to the automatic gain controller 202 and is also output to the second IF amplifier 213. The automatic gain controller 202 determines the automatic gain control voltage V AGC to be applied to the attenuator 201 according to the level of the first IF signal, and the second IF amplifier 213 determines the second mixer 211. The second IF signal input from the amplifier is amplified and output to a demodulator (not shown) connected to the rear end of the tuner.

이와 같이 본 고안은 분배기를 튜너에 내장하고, 분배기앞단에 감쇄기 및 잡음지수 특성이 우수한 고주파증폭기를 설치하여, 분배기에서 발생하는 신호손실을 보상하고, 그 결과 분배기의 신호손실에 의해 발생했던 잡음지수 열화밀 화질감도의 저하를 개선하는 우수한 효과가 있는 것이다.As such, the present invention incorporates a divider in the tuner and installs a high-frequency amplifier with excellent attenuator and noise figure characteristics in front of the divider to compensate for the signal loss generated by the divider, resulting in the noise figure generated by the divider signal loss. There is an excellent effect of improving the deterioration of deteriorated image quality sensitivity.

Claims (1)

(정정) 안테나로 수신된 고주파신호를 중간주파신호로 변환하는 튜너에 있어서,(Correction) A tuner for converting a high frequency signal received by an antenna into an intermediate frequency signal, 상기 안테나로부터 수신된 고주파신호레벨을 하기 자동이득제어전압에 따른 신호레벨로 조절하는 감쇄기와,An attenuator for adjusting the high frequency signal level received from the antenna to a signal level according to the following automatic gain control voltage; 상기 감쇄기로부터 출력되는 고주파신호를 소정레벨로 증폭하는 고주파증폭기와,A high frequency amplifier for amplifying a high frequency signal output from the attenuator to a predetermined level; 상기 고주파증폭기에 의해 증폭된 고주파신호를 분배하여 PIP용 고주파신호를 출력하고, 모화면용 고주파신호를 출력하는 분배기와,A divider for distributing a high frequency signal amplified by the high frequency amplifier, outputting a high frequency signal for PIP, and outputting a high frequency signal for a mother screen; 상기 분배기의 출력신호중 모화면용 고주파신호를 동조시키는 입력동조필터와,An input tuning filter for tuning a high frequency signal for a mother screen among the output signals of the distributor; 상기 입력동조필터로부터 입력되는 고주파신호를 가변발진주파수와 혼합하여 제1중간주파신호로 변환하는, 제1믹서와 가변발진기로 이루어진 제1주파수변화기와,A first frequency changer comprising a first mixer and a variable oscillator for converting a high frequency signal input from the input tuning filter into a first intermediate frequency signal by mixing with a variable oscillation frequency; 상기 제1주파수변환기로부터 출력되는 제1중간주파신호에 동조하는 제1단간동조필터와,A first inter-stage tuning filter for tuning to a first intermediate frequency signal output from said first frequency converter; 상기 제1단간동조필터로부터 출력되는 제1중간주파신호를 증폭하는 제1중간주파증폭기와,A first intermediate frequency amplifier for amplifying a first intermediate frequency signal output from the first stage interpolation filter; 상기 제1IF증폭기로부터 출력되는 제1중간주파신호에 동조하는 제2단간동조필터와,A second inter-phase tuning filter tuned to a first intermediate frequency signal output from the first IF amplifier, 상기 제2단간동조필터로부터 입력되는 제1중간주파신호를 국부발진주파수와 혼합하여 제2중간주파신호로 변환하는 제1믹서와 국부발진주파수로 이루어진 제2주파수변환기와,A second frequency converter comprising a first mixer and a local oscillation frequency, the first mixer converting the first intermediate frequency signal inputted from the second inter-phase tuning filter into a second intermediate frequency signal by mixing with a local oscillation frequency; 상기 제2주파수변환기로부터 출력된 제2중간주파신호를 증폭하는 제2중간주파증폭기와,A second intermediate frequency amplifier for amplifying a second intermediate frequency signal output from the second frequency converter; 상기 제2주파수변환기로부터 출력되는 제2중간주파신호의 신호레벨에 따른 자동이득제어전압을 상기 감쇄기로 출력하는 자동이득제어기를 구비함을 특징으로 하는 분배기 내장튜너.And an automatic gain controller for outputting an automatic gain control voltage according to the signal level of the second intermediate frequency signal output from the second frequency converter to the attenuator.
KR2019930022519U 1993-10-30 1993-10-30 Tuner having distributor KR960007151Y1 (en)

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KR960007151Y1 true KR960007151Y1 (en) 1996-08-22

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