KR20030024412A - Reception apparatus for analog/digital broadcasting signal of a television set - Google Patents

Reception apparatus for analog/digital broadcasting signal of a television set Download PDF

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Publication number
KR20030024412A
KR20030024412A KR1020010057553A KR20010057553A KR20030024412A KR 20030024412 A KR20030024412 A KR 20030024412A KR 1020010057553 A KR1020010057553 A KR 1020010057553A KR 20010057553 A KR20010057553 A KR 20010057553A KR 20030024412 A KR20030024412 A KR 20030024412A
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South Korea
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analog
signal
digital
tuner
high frequency
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KR1020010057553A
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Korean (ko)
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정수원
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엘지전자 주식회사
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Priority to KR1020010057553A priority Critical patent/KR20030024412A/en
Publication of KR20030024412A publication Critical patent/KR20030024412A/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
    • H04N5/46—Receiver circuitry for the reception of television signals according to analogue transmission standards for receiving on more than one standard at will
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
    • H04N21/4263—Internal components of the client ; Characteristics thereof for processing the incoming bitstream involving specific tuning arrangements, e.g. two tuners
    • H04N21/42638—Internal components of the client ; Characteristics thereof for processing the incoming bitstream involving specific tuning arrangements, e.g. two tuners involving a hybrid front-end, e.g. analog and digital tuners
    • 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
    • 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)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE: An apparatus for receiving analog/digital broadcasting of a television receiver set is provided to switch an IF signal and an RF signal to selectively tune analog and digital broadcasting signals, thereby receiving both analog and digital broadcasting signals without extra costs. CONSTITUTION: A tuner(11) tunes an RF input signal for outputting an IF(Intermediate Frequency) signal, and receives an RF AGC(Automatic Gain Control) signal. A D/A switching part(12) receives a digital IF signal for transmitting to a digital TV signal processor(13) and receives a digital RF AGC signal from the digital TV signal processor for transmitting to the tuner. Otherwise, the D/A switching part receives an analog IF signal for transmitting to an analog TV signal processor(14) and receives an analog RF AGC signal from the analog TV signal processor for transmitting to the tuner. The digital TV signal processor restores the digital IF signal to the original digital video signal and provides the digital RF AGC signal to the D/A switching part. The analog TV signal processor restores the analog IF signal to the original analog video signal and provides the analog RF AGC signal to the D/A switching part.

Description

텔레비젼수상기의 아날로그/디지털방송 수신장치{RECEPTION APPARATUS FOR ANALOG/DIGITAL BROADCASTING SIGNAL OF A TELEVISION SET}Analog / digital broadcasting receiver of TV receiver {RECEPTION APPARATUS FOR ANALOG / DIGITAL BROADCASTING SIGNAL OF A TELEVISION SET}

본 발명은 하나의 튜너를 이용하여 디지털 방송과 아날로그 방송을 수신하는 기술에 관한 것으로, 특히 아날로그/디지털 방송신호에 따라 튜너로부터 출력되는 중간주파수 신호와 그 튜너에 공급되는 고주파 자동이득제어신호를 적절히 절환할 수 있도록 한 텔레비젼수상기의 아날로그/디지털방송 수신장치에 관한 것이다.The present invention relates to a technology for receiving digital broadcasts and analog broadcasts using a single tuner. In particular, the present invention relates to an intermediate frequency signal output from a tuner and a high frequency automatic gain control signal supplied to the tuner according to an analog / digital broadcast signal. The present invention relates to an analog / digital broadcasting receiver of a television receiver which can be switched.

최근 각 나라별로 디지털 방송을 위한 규격이 마련되고, 그 규격에 따른 디지털 방송이 진행되고 있다. 따라서, 현재는 기존의 아날로그 방송과 새로 등장한 디지털 방송이 공존하고 있는 상황이다. 그런데, 디지털 방송과 아날로그 방송은 방송신호 뿐만 아니라 전파의 세기나 수신감도 등에서 차별화 된다. 따라서, 종래에 있어서는 디지털 방송용 튜너와 아날로그 방송용 튜너를 모두 구비하여 원하는 방송신호를 수신하도록 되어 있었다.Recently, standards for digital broadcasting have been prepared for each country, and digital broadcasting in accordance with the standards is in progress. Therefore, the existing analog broadcasting and the newly appeared digital broadcasting coexist. However, digital broadcasts and analog broadcasts are differentiated not only from broadcast signals but also from radio wave strength and reception sensitivity. Therefore, conventionally, both a digital broadcast tuner and an analog broadcast tuner are provided to receive a desired broadcast signal.

이와 같이 종래의 텔레비젼방송 수신장치에 있어서는 아날로그 방송신호와 디지털 방송신호를 모두 수신하기 위해 두 개의 전용 튜너를 구비하게 되어 있어 텔레비젼수상기의 원가를 상승시키게 되는 결함이 있었다.As described above, in the conventional television broadcasting receiver, two dedicated tuners are provided to receive both the analog broadcasting signal and the digital broadcasting signal, thereby increasing the cost of the television receiver.

따라서, 본 발명의 제1목적은 하나의 튜너로 디지털 방송신호와 아날로그 방송신호를 모두 튜닝할 수 있도록 하는데 있다.Accordingly, a first object of the present invention is to enable tuning of both a digital broadcast signal and an analog broadcast signal with one tuner.

본 발명의 제2목적은 튜너의 출력신호인 중간주파수 신호와 튜너의 입력신호인 고주파 자동이득제어신호를 동시에 스위칭할 수 있도록 하는데 있다.A second object of the present invention is to enable simultaneous switching between an intermediate frequency signal, which is an output signal of a tuner, and a high frequency automatic gain control signal, which is an input signal of a tuner.

도 1은 본 발명에 의한 텔레비젼수상기의 아날로그/디지털방송 수신장치의 블록도.1 is a block diagram of an analog / digital broadcast receiver of a television receiver according to the present invention;

도 2는 도 1에서 D/A 스위칭부의 상세 회로도.FIG. 2 is a detailed circuit diagram of a D / A switching unit in FIG. 1. FIG.

** 도면의 주요 부분에 대한 부호의 설명 **** Description of symbols for the main parts of the drawing **

11 : 튜너12 : D/A 스위칭부11: tuner 12: D / A switching unit

12A : 스위칭 제어부12B : 스위칭회로부12A: switching control part 12B: switching circuit part

13 : 디지털 티브이신호 처리부14 : 아날로그 티브이신호 처리부13 digital TV signal processing unit 14 analog TV signal processing unit

본 발명의 제1특징에 따르면, 하나의 튜너를 이용하여 아날로그 방송신호와 디지털 방송신호를 수신할 수 있도록 하기 위하여 스위칭 회로를 사용한다.According to a first aspect of the present invention, a switching circuit is used to receive an analog broadcast signal and a digital broadcast signal using one tuner.

본 발명의 제2특징에 따르면, 제1특징에서의 스위칭 회로는 커플링된 콘덴서를 통해 중간주파수 신호(IF)를 스위칭하고, 커플링된 인덕터를 통해 고주파 자동이득제어신호(IF AGC)를 스위칭한다.According to a second aspect of the invention, the switching circuit in the first aspect switches the intermediate frequency signal IF through a coupled capacitor and switches the high frequency automatic gain control signal IF AGC through a coupled inductor. do.

본 발명의 제3특징에 따르면, 제1특징에서의 스위칭 회로는 디지털/아날로그 선택제어신호에 따라 스위칭 동작이 제어된다.According to the third aspect of the invention, the switching operation of the switching circuit in the first aspect is controlled in accordance with a digital / analog selection control signal.

이하, 본 발명을 첨부한 도면을 참조하여 설명한다.Hereinafter, with reference to the accompanying drawings, the present invention will be described.

도 1은 본 발명에 의한 텔레비젼수상기의 아날로그/디지털방송 수신장치의 일실시 구현예를 보인 블록도로서 이에 도시한 바와 같이, 고주파 입력신호(RF_IN)를 튜닝하여 중간주파수 신호(IF)를 출력하고, 디지털(D)/아날로그(A) 스위칭부(12)로부터 고주파 자동이득제어신호(RF_AGC)를 입력받는 튜너(11)와; 선택제어신호(D/A CTL)에 따라, 상기 튜너(11)로부터 디지털 중간주파수 신호(Digital IF)를 입력받아 디지털 티브이신호 처리부(13)에 전달하고 그로부터 디지털 고주파 자동이득제어신호(Digital RF_AGC)를 입력받아 튜너(11)에 전달하거나, 상기 튜너(11)로부터 아날로그 중간주파수 신호(Analog IF)를 입력받아 아날로그 티브이신호 처리부(14)에 전달하고 그로부터 아날로그 고주파 자동이득제어신호(Analog RF_AGC)를 입력받아 튜너(11)에 전달하는 D/A스위칭부(12)와; 상기 D/A 스위칭부(12)로부터 디지털 중간주파수 신호(Digital IF)를 입력받아 원래의 디지털 영상신호로 복원처리하고, 그 D/A 스위칭부(12)에 디지털 고주파 자동이득제어신호(Digital RF_AGC)를 공급하는 디지털 티브이신호 처리부(13)와; 상기 D/A 스위칭부(12)로부터 아날로그 중간주파수 신호(Analog IF)를 입력받아 원래의 아날로그 영상신호로 복원처리하고, 그 D/A 스위칭부(12)에 아날로그 고주파 자동이득제어신호(Analog RF_AGC)를 공급하는 아날로그 티브이신호 처리부(14)로 구성하였다.1 is a block diagram showing an embodiment of an analog / digital broadcasting receiver of a television receiver according to the present invention. As shown in FIG. 1, a high frequency input signal RF_IN is tuned to output an intermediate frequency signal IF. A tuner 11 for receiving a high frequency automatic gain control signal RF_AGC from the digital (D) / analog (A) switching unit 12; According to the selection control signal (D / A CTL), the digital intermediate frequency signal (Digital IF) is received from the tuner 11 and transmitted to the digital TV signal processing unit 13, from which the digital high frequency automatic gain control signal (Digital RF_AGC) is received. Receives and transmits to the tuner 11, or receives the analog intermediate frequency signal (Analog IF) from the tuner 11 and transmits it to the analog TV signal processing unit 14 and receives the analog high frequency automatic gain control signal (Analog RF_AGC) therefrom. A D / A switching unit 12 which receives an input and delivers it to the tuner 11; The digital intermediate frequency signal (Digital IF) is received from the D / A switching unit 12 and restored to the original digital video signal, and the digital high frequency automatic gain control signal (Digital RF_AGC) is applied to the D / A switching unit 12. A digital TV signal processor (13) for supplying; The analog intermediate frequency signal (Analog IF) is received from the D / A switching unit 12 and restored to the original analog image signal, and the analog high frequency automatic gain control signal (Analog RF_AGC) is applied to the D / A switching unit 12. It was configured as an analog TV signal processing unit 14 for supplying.

도 2는 도 1에서 D/A 스위칭부(12)의 일실시 구현예를 보인 상세 회로도로서 이에 도시한 바와 같이, 상기 선택제어신호(D/A CTL)에 따라, 내부의 트랜지스터(Q1,Q2),(Q3)를 온오프시켜 스위칭회로부(12B)의 입출력노드(N1),(N2) 중 어느 하나를 접지레벨로 설정하는 스위칭 제어부(12A)와; 상기 스위칭 제어부(12A)의 제어에 의해 제1입출력노드(N1)가 접지레벨로 될 때, 상기 튜너(11)에서 출력되는 중간주파수 신호(IF)를 디지털 중간주파수 신호(Digital IF)로 출력함과 아울러 상기 디지털 고주파 자동이득제어신호(Digital RF_AGC)를 튜너(11)에 전달하고, 상기 스위칭 제어부(12A)의 제어에 의해 제2입출력노드(N2)가 접지레벨로 될 때, 상기 튜너(11)에서 출력되는 중간주파수 신호(IF)를 아날로그 중간주파수 신호(Analog IF)로 출력함과 아울러 상기 아날로그 고주파 자동이득제어신호 (Analog RF_AGC)를 튜너(11)에 전달하는 스위칭 회로부(12B)로 구성한 것으로, 이와 같이 구성한 본 발명의 작용을 상세히 설명하면 다음과 같다.FIG. 2 is a detailed circuit diagram illustrating an embodiment of the D / A switching unit 12 in FIG. 1. As illustrated in FIG. 1, the internal transistors Q1 and Q2 may be formed according to the selection control signal D / A CTL. A switching control unit 12A for turning on / off Q3 to set one of the input / output nodes N1 and N2 of the switching circuit unit 12B to the ground level; When the first input / output node N1 becomes the ground level by the control of the switching controller 12A, the intermediate frequency signal IF output from the tuner 11 is output as a digital intermediate frequency signal Digital IF. In addition, when the digital high frequency automatic gain control signal (Digital RF_AGC) is transmitted to the tuner 11 and the second input / output node N2 is brought to the ground level by the control of the switching controller 12A, the tuner 11 ) Is configured as a switching circuit unit 12B for outputting the intermediate frequency signal IF output from the analog IF signal as an analog intermediate frequency signal (Analog IF) and transmitting the analog high frequency automatic gain control signal (Analog RF_AGC) to the tuner 11. The operation of the present invention configured as described above will be described in detail as follows.

튜너(11)는 고주파 입력신호(RF_IN)를 튜닝하여 중간주파수 신호(IF)를 디지털(D)/아날로그(A) 스위칭부(12)에 출력하고, 그 D/A 스위칭부(12)로부터 고주파 자동이득제어신호(RF_AGC)를 입력받는다.The tuner 11 tunes the high frequency input signal RF_IN to output the intermediate frequency signal IF to the digital (D) / analog (A) switching unit 12, and the high frequency from the D / A switching unit 12. The automatic gain control signal RF_AGC is received.

그런데, 상기 중간주파수 신호(IF)는 상기 D/A 스위칭부(12)의 스위칭 결과에 따라 디지털 중간주파수 신호(Digital IF)로 결정되거나 아날로그 중간주파수 신호(Analog IF)로 결정되고, 상기 고주파 자동이득제어신호(RF_AGC) 또한 D/A 스위칭부(12)의 스위칭 결과에 따라 디지털 고주파 자동이득제어신호(Digital RF_AGC)로 결정되거나 아날로그 고주파 자동이득제어신호(Analog RF_AGC)로 결정된다.However, the intermediate frequency signal IF is determined as a digital intermediate frequency signal (Digital IF) or an analog intermediate frequency signal (Analog IF) according to the switching result of the D / A switching unit 12, and the high frequency automatic The gain control signal RF_AGC is also determined as the digital high frequency automatic gain control signal Digital RF_AGC or the analog high frequency automatic gain control signal Analog RF_AGC according to the switching result of the D / A switching unit 12.

또한, 상기 D/A 스위칭부(12)는 외부로부터 입력되는 선택제어신호(D/A CTL)에 따라 내부 스위칭회로를 스위칭하여, 상기 튜너(11)로부터 디지털 중간주파수 신호(Digital IF)를 입력받아 디지털 티브이신호 처리부(13)에 전달하고 그로부터 디지털 고주파 자동이득제어신호(Digital RF_AGC)를 입력받아 튜너(11)에 전달하거나, 상기 튜너(11)로부터 아날로그 중간주파수 신호(Analog IF)를 입력받아 아날로그 티브이신호 처리부(14)에 전달하고 그로부터 아날로그 고주파 자동이득제어신호 (Analog RF_AGC)를 입력받아 튜너(11)에 전달하게 된다.In addition, the D / A switching unit 12 switches an internal switching circuit according to a selection control signal (D / A CTL) input from the outside, and inputs a digital intermediate frequency signal (Digital IF) from the tuner 11. The digital TV signal processor 13 receives the digital high frequency automatic gain control signal Digital RF_AGC from the digital TV signal processor 13 and transmits the digital high frequency automatic gain control signal Digital RF_AGC to the tuner 11, or receives the analog IF signal from the tuner 11. The analog TV signal processor 14 receives the analog high frequency automatic gain control signal (Analog RF_AGC) and transmits it to the tuner 11.

결국, 사용자의 요구에 따라 상기 D/A 스위칭부(12)에 선택제어신호(D/A CTL)를 출력 함으로써, 하나의 튜너(11)를 이용하여 디지털 방송신호나 아날로그 방송신호를 수신할 수 있게 된다.As a result, by outputting a selection control signal (D / A CTL) to the D / A switching unit 12 according to a user's request, it is possible to receive a digital broadcast signal or an analog broadcast signal using one tuner 11. Will be.

이하, 상기 D/A 스위칭부(12)의 스위칭 작용을 도 2를 참조하여 상세히 설명한다.Hereinafter, the switching action of the D / A switching unit 12 will be described in detail with reference to FIG.

먼저, 사용자가 디지털 방송신호를 수신하기 위해 특정 키이신호를 입력하면 시스템 제어부(도면에 미표시)에 의해 상기 선택제어신호(D/A CTL)가 "하이"로 입력된다.First, when a user inputs a specific key signal to receive a digital broadcast signal, the selection control signal D / A CTL is input as "high" by a system control unit (not shown).

이에 따라, 스위칭 제어부(12A)의 트랜지스터(Q1),(Q2)가 턴온되고, 트랜지스터(Q3)가 턴오프되어 제1입출력노드(N1)의 DC 레벨은 접지레벨(GND)과 같게 된다. 이로 인하여 제2입출력노드의 DC 레벨은 디지털 고주파 자동이득제어신호 (Digital RF_AGC)에 의해 결정된다.Accordingly, the transistors Q1 and Q2 of the switching controller 12A are turned on, the transistor Q3 is turned off, and the DC level of the first input / output node N1 becomes equal to the ground level GND. As a result, the DC level of the second input / output node is determined by the digital high frequency automatic gain control signal (Digital RF_AGC).

따라서, 다이오드(D1)가 턴오프되는 반면 다이오드(D2)가 턴온된다. 이로 인하여 상기 튜너(11)에서 출력되는 중간주파수 신호(IF)가 콘덴서(C3), 다이오드 (D2) 및 콘덴서(C2)를 순차적으로 통해 디지털 중간주파수 신호(Digital IF)로 출력된다. 이와 동시에, 상기 디지털 고주파 자동이득제어신호(Digital RF_AGC)가 다이오드(D2) 및 코일(L3)을 통해 튜너(11)에 전달된다.Thus, diode D1 is turned off while diode D2 is turned on. As a result, the intermediate frequency signal IF output from the tuner 11 is sequentially output as the digital intermediate frequency signal Digital IF through the capacitor C3, the diode D2, and the capacitor C2. At the same time, the digital high frequency automatic gain control signal Digital RF_AGC is transmitted to the tuner 11 through the diode D2 and the coil L3.

그러나, 사용자가 아날로그 방송신호를 수신하기 위해 또 다른 특정 키이신호를 입력하면 시스템 제어부에 의해 상기 선택제어신호(D/A CTL)가 "로우"로 입력된다.However, when the user inputs another specific key signal to receive the analog broadcast signal, the selection control signal D / A CTL is input as "low" by the system controller.

이에 따라, 상기 스위칭 제어부(12A)의 트랜지스터(Q1),(Q2)가 턴오프되고, 트랜지스터(Q3)가 턴온되어 제2입출력노드(N2)의 DC 레벨이 접지레벨(GND)과 같게 된다. 이로 인하여 제1입출력노드의 DC 레벨은 아날로그 고주파 자동이득제어신호 (Analog RF_AGC)에 의해 결정된다.Accordingly, the transistors Q1 and Q2 of the switching controller 12A are turned off, and the transistor Q3 is turned on so that the DC level of the second input / output node N2 is equal to the ground level GND. As a result, the DC level of the first I / O node is determined by the analog high frequency automatic gain control signal (Analog RF_AGC).

따라서, 다이오드(D2)가 턴오프되는 반면 다이오드(D1)가 턴온된다. 이로 인하여 상기 튜너(11)에서 출력되는 중간주파수 신호(IF)가 콘덴서(C3), 다이오드 (D1) 및 콘덴서(C1)를 순차적으로 통해 아날로그 중간주파수 신호(Analog IF)로 출력된다. 이와 동시에, 상기 아날로그 고주파 자동이득제어신호(Analog RF_AGC)가 다이오드(D1) 및 코일(L3)을 통해 튜너(11)에 전달된다.Thus, diode D2 is turned off while diode D1 is turned on. Accordingly, the intermediate frequency signal IF output from the tuner 11 is sequentially output as an analog intermediate frequency signal Analog IF through the capacitor C3, the diode D1, and the capacitor C1. At the same time, the analog high frequency automatic gain control signal Analog RF_AGC is transmitted to the tuner 11 through the diode D1 and the coil L3.

이상에서 상세히 설명한 바와 같이 본 발명은 하나의 튜너로 디지털 방송신호와 아날로그 방송신호를 선택적으로 튜닝할 수 있도록 중간주파수 신호와 고주파 자동이득제어신호를 스위칭 함으로써, 별다른 추가비용 없이 디지털 방송신호와 아날로그 방송신호를 모두 수신할 수 있는 효과가 있다.As described in detail above, the present invention switches the intermediate frequency signal and the high frequency automatic gain control signal to selectively tune the digital broadcast signal and the analog broadcast signal with one tuner, thereby enabling the digital broadcast signal and the analog broadcast without additional costs. It is effective to receive all signals.

Claims (4)

고주파 입력신호를 튜닝하여 중간주파수 신호를 얻고, D/A 스위칭부(12)로부터 고주파 자동이득제어신호를 입력받는 튜너(11)와; 선택제어신호에 따라, 상기 튜너(11)로부터 디지털 또는 아날로그 중간주파수 신호를 입력받아 디지털 티브이신호 처리부(13) 또는 아날로그 티브이신호 처리부(14)에 전달하고, 디지털 티브이신호 처리부(13) 또는 아날로그 티브이신호 처리부(14)로부터 디지털 고주파 자동이득제어신호 또는 아날로그 고주파 자동이득제어신호를 입력받아 튜너(11)에 전달하는 D/A 스위칭부(12)를 포함하여 구성한 것을 특징으로 하는 텔레비젼수상기의 아날로그/디지털방송 수신장치.A tuner 11 for tuning an high frequency input signal to obtain an intermediate frequency signal and receiving a high frequency automatic gain control signal from the D / A switching unit 12; According to the selection control signal, the digital or analog intermediate frequency signal is received from the tuner 11 and transmitted to the digital TV signal processor 13 or the analog TV signal processor 14, and the digital TV signal processor 13 or the analog TV. And a D / A switching unit 12 which receives a digital high frequency automatic gain control signal or an analog high frequency automatic gain control signal from the signal processing unit 14 and transmits it to the tuner 11. Digital broadcasting receiver. 제1항에 있어서, D/A 스위칭부(12)는 상기 선택제어신호에 따라, 내부의 트랜지스터들을 온오프시켜 스위칭회로부(12B)의 입출력노드(N1),(N2) 중 어느 하나를 접지레벨로 설정하는 스위칭 제어부(12A)와; 상기 제1입출력노드(N1)가 접지레벨로 될 때 상기 튜너(11)에서 출력되는 중간주파수 신호를 디지털 중간주파수 신호로 출력함과 아울러 상기 디지털 고주파 자동이득제어신호를 튜너(11)에 전달하고, 제2입출력노드(N2)가 접지레벨로 될 때에는 상기 튜너(11)에서 출력되는 중간주파수 신호를 아날로그 중간주파수 신호로 출력함과 아울러 상기 아날로그 고주파 자동이득제어신호를 튜너(11)에 전달하는 스위칭 회로부(12B)로 구성된 것을 특징으로 하는 텔레비젼수상기의 아날로그/디지털방송 수신장치.2. The D / A switching unit 12 according to claim 1, wherein the D / A switching unit 12 turns on or off internal transistors to turn any one of the input / output nodes N1 and N2 of the switching circuit unit 12B to ground level. A switching controller 12A set to be; When the first I / O node N1 becomes the ground level, the intermediate frequency signal output from the tuner 11 is output as a digital intermediate frequency signal, and the digital high frequency automatic gain control signal is transmitted to the tuner 11. When the second input / output node N2 becomes the ground level, the intermediate frequency signal output from the tuner 11 is output as an analog intermediate frequency signal and the analog high frequency automatic gain control signal is transmitted to the tuner 11. An analog / digital broadcast receiver for a television receiver, comprising a switching circuit section (12B). 제2항에 있어서, 스위칭 제어부(12A)는 베이스측이 상기 선택제어신호 단자에 접속되고, 콜렉터측이 전원단자(Vcc)에 접속된 에미터 접지형 트랜지스터(Q1)와; 베이스측이 상기 선택제어신호 단자에 접속되고, 콜렉터가 상기 제1입출력노드(N1)에 접속되며, 그 접속점이 전원단자(Vcc)측에 접속된 에미터 접지형 트랜지스터(Q2)와; 베이스가 상기 트랜지스터(Q1)의 콜렉터에 접속되고, 콜렉터가 상기 제2입출력노드(N2)에 접속되며, 그 접속점이 전원단자(Vcc)측에 접속된 에미터 접지형 트랜지스터(Q3)로 구성된 것을 특징으로 하는 텔레비젼수상기의 아날로그/디지털방송 수신장치.3. The switching controller (12A) of claim 2, further comprising: an emitter grounding transistor (Q1) having a base side connected to the selection control signal terminal and a collector side connected to a power supply terminal (Vcc); An emitter grounding transistor (Q2) having a base side connected to the selection control signal terminal, a collector connected to the first input / output node (N1), and a connection point thereof connected to a power supply terminal (Vcc) side; The base is connected to the collector of the transistor Q1, the collector is connected to the second input / output node N2, and the connection point is composed of an emitter grounding transistor Q3 connected to the power supply terminal Vcc side. An analog / digital broadcasting receiver for a television receiver. 제2항에 있어서, 스위칭 회로부(12B)는 중간주파수 단자(IF)와 고주파 자동이득제어단자(RF_AGC)가 콘덴서(C3),코일(L3)을 각기 통해 공통 접속되어 그 접속점이 다이오드(D1),(D2)를 역방향으로 각기 통해 상기 제1,2입출력노드(N1),(N2)에 각기 접속되며, 그 두 노드(N1),(N2)가 콘덴서(C1),(C2)를 각기 통해 아날로그 중간주파수 단자(Analog IF), 디지털 중간주파수 단자(Digital IF)에 각기 접속되고, 다른 한편으로는 코일(L1),(L2)을 각기 통해 디지털 고주파 자동이득제어단자 (Digital RF_AGC), 아날로그 고주파 자동이득제어단자(Analog RF_AGC)에 각기 접속되어 구성된 것을 특징으로 하는 텔레비젼수상기의 아날로그/디지털방송 수신장치.The switching circuit unit 12B has an intermediate frequency terminal IF and a high frequency automatic gain control terminal RF_AGC commonly connected to each other through the capacitor C3 and the coil L3, and the connection point thereof is the diode D1. Are connected to the first and second input / output nodes N1 and N2 through D2 in the reverse direction, respectively, and the two nodes N1 and N2 are connected through the capacitors C1 and C2, respectively. It is connected to the analog IF terminal and the digital IF terminal, respectively. On the other hand, the digital high frequency automatic gain control terminal (Digital RF_AGC) and the analog high frequency are connected through the coils L1 and L2, respectively. An analog / digital broadcasting receiver for a television receiver, each connected to an automatic gain control terminal (Analog RF_AGC).
KR1020010057553A 2001-09-18 2001-09-18 Reception apparatus for analog/digital broadcasting signal of a television set KR20030024412A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060060142A (en) * 2004-11-30 2006-06-05 서울통신기술 주식회사 Apparatus for receiving and transmitting analog and digital broadcasting
KR100602345B1 (en) * 2004-07-28 2006-07-14 주식회사 현대오토넷 System for supplying function of theater in a car audio system and method thereof
KR100648339B1 (en) * 2005-06-02 2006-11-23 엘지전자 주식회사 Gain control apparatus and method in the digital television
KR20070075979A (en) * 2006-01-17 2007-07-24 삼성전기주식회사 Multi broadcasting receiver
KR100872550B1 (en) * 2006-08-24 2008-12-08 엘지이노텍 주식회사 Auto gain control circuit of tuner
KR101522872B1 (en) * 2008-12-17 2015-05-26 엘지이노텍 주식회사 Circuit for controlling automatic gain of digital intermediate frequency

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100602345B1 (en) * 2004-07-28 2006-07-14 주식회사 현대오토넷 System for supplying function of theater in a car audio system and method thereof
KR20060060142A (en) * 2004-11-30 2006-06-05 서울통신기술 주식회사 Apparatus for receiving and transmitting analog and digital broadcasting
KR100648339B1 (en) * 2005-06-02 2006-11-23 엘지전자 주식회사 Gain control apparatus and method in the digital television
KR20070075979A (en) * 2006-01-17 2007-07-24 삼성전기주식회사 Multi broadcasting receiver
KR100872550B1 (en) * 2006-08-24 2008-12-08 엘지이노텍 주식회사 Auto gain control circuit of tuner
KR101522872B1 (en) * 2008-12-17 2015-05-26 엘지이노텍 주식회사 Circuit for controlling automatic gain of digital intermediate frequency

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