KR880002701Y1 - Input signal modulating circuit of television - Google Patents

Input signal modulating circuit of television Download PDF

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Publication number
KR880002701Y1
KR880002701Y1 KR2019850005871U KR850005871U KR880002701Y1 KR 880002701 Y1 KR880002701 Y1 KR 880002701Y1 KR 2019850005871 U KR2019850005871 U KR 2019850005871U KR 850005871 U KR850005871 U KR 850005871U KR 880002701 Y1 KR880002701 Y1 KR 880002701Y1
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South Korea
Prior art keywords
transistor
resistor
signal
external video
video signal
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KR2019850005871U
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Korean (ko)
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KR860015510U (en
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한백희
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삼성전자 주식회사
정재은
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Priority to KR2019850005871U priority Critical patent/KR880002701Y1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/222—Studio circuitry; Studio devices; Studio equipment
    • H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
    • H04N5/268—Signal distribution or switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
    • 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
    • H04N5/00—Details of television systems
    • H04N5/63—Generation or supply of power specially adapted for television receivers

Abstract

내용 없음.No content.

Description

테레비젼의 입력신호 절환회로TV's input signal switching circuit

첨부도면은 본 고안의 회로도.The accompanying drawings are circuit diagrams of the present invention.

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

1 : 테레비젼 신호 입력단자 2 : 외부비데오신호 입력단자1: TV signal input terminal 2: External video signal input terminal

3 : 선택신호 출력단자 4 : 외부비데오신호 구동부3: Select signal output terminal 4: External video signal driver

5 : 스위칭부 6 : 혼선제거부5: switching part 6: crosstalk removing part

Q1-Q4: 트랜지스터 D1-D3: 다이오드Q 1 -Q 4 : Transistor D 1 -D 3 : Diode

R1-R11: 저항 C1-C4: 콘덴서R 1 -R 11 : Resistor C 1 -C 4 : Capacitor

SW : 신호절환스위치SW: Signal Switch

본 고안은 외부 비데오 및 오디오신호의 입력시스템을 내장한 테레비젼에 있어서, 자체의 테레비젼신호와 외부비데오신호를 두 신호사이의 혼선(crosstalk)을 제거시킨 상태에서 절환시켜 사용토록 된 테레비젼의 입력신호 절환회로에 대한 것이다.According to the present invention, in a television having an input system of an external video and audio signal, the video signal and the external video signal are switched in a state in which crosstalk between the two signals is eliminated so as to switch the input signal of the television to be used. For the circuit.

종래에는 기계식 접점스위치나 스위칭 IC등을 사용하여 자체 테레비젼 신호와 외부비데오신호를 절환시켜왔으나, 전자는 기계식 접점의 접속시 접촉잡음 발생과 함께 입력신호의 상호 간섭현상을 제거시킬 수 없으며, 후자 또한 스위칭 IC의 내부구조에 기인한 두 신호간의 혼선이 야기되는 단점이 있었다.In the past, mechanical contact switches or switching ICs have been used to switch the TV and external video signals. However, the former cannot eliminate the mutual interference of the input signals with the generation of contact noise when the mechanical contacts are connected. There was a disadvantage that the crosstalk between the two signals due to the internal structure of the switching IC is caused.

본 고안은 상기와 같은 단점을 해결하기 위한 것으로서, 스위칭 트랜지스터 및 다이오드에 의한 입력신호절환과 함께 이와 일체로 병설된 혼선제거회로에 의해 두 입력신호간에 야기되는 혼선을 제거시키도록 안출한 것으로 이를 첨부도면에 의해 상술하면 다음과 같다.The present invention has been made to solve the above drawbacks, and the input signal switching by the switching transistor and diode together with the crosstalk removal circuit which is integrated with this to eliminate the crosstalk caused between the two input signals. When described in detail with the drawings as follows.

테레비젼 신호입력단자(1)와 연결된 트랜지스터(Q1)의 에미터와, 외부비데오신호입력단자(2)와 연결되는 저항(R2-R5), 콘덴서(C1)(C2) 및 트랜지스터(Q2)로 된 외부비데오신호구동부(4)의 출력단을 공접한 후 선택신호출력단자(3)에 연결함과 동시에 저항(R1)을 통해 접지시키고, 다이오드(D2) 및 신호절환스위치(SW)에 의해 Vcc전압을 공급받는 트랜지스터(Q4), 저항(R10), (R11) 및 다이오드(D3)로 된 혼선제거부(6)의 출력단을 다이오드(D1)를 통해 테레비젼 신호입력단자(1)에 연결하는 한편, 저항(R9)을 통해 PNP트랜지스터(Q3) 및 저항(R7)(R8)으로 된 스위칭부(5)에 연결하며, 이 스위칭부(5)내의 트랜지스터(Q3)의 콜렉터를 저항(R6)을 통해 외부비데오신호구동부(4)내의 트랜지스터(Q2)의 콜렉터에 연결한 구성으로서, 미설명부호중 C3, C4는 평활콘덴서이다.Emitter of transistor Q 1 connected to TV signal input terminal 1, resistor R 2 -R 5 , capacitor C 1 (C 2 ) and transistor connected to external video signal input terminal 2. The output terminal of the external video signal driver 4 made of (Q 2 ) is shared and connected to the selection signal output terminal 3, and grounded through a resistor R 1 , and a diode D 2 and a signal switching switch. The output terminal of the crosstalk remover 6 composed of the transistor Q 4 , the resistor R 10 , the resistor R 11 , and the diode D 3 supplied with the Vcc voltage by the (SW) through the diode D 1 . It is connected to the TV signal input terminal 1, while it is connected to a switching unit 5 consisting of a PNP transistor Q 3 and a resistor R 7 (R 8 ) through a resistor R 9 . 5) a configuration connected to a collector of the transistor (Q 2) in the external video signal probe (4) through the transistor (resistor (R 6 to the collector of Q 3)) within the, reference numeral of the C 3, C 4 are flat A capacitor.

이와같은 구성인 본 고안의 작용 및 효과는 아래와 같다.The operation and effects of the present invention as such a configuration are as follows.

신호절환스위치(SW)가 개방시는 테레비젼신호 선택모드가 되는데, 단자(1)로 입력된 테레비젼 신호가 트랜지스터(Q1)에 의해 구동된 후 출력단자(3)를 통해 출력된 후 일반 비데오처리회로로 입력되는 반면, 다이오드(D1)는 캐소우드로 Vcc전압이 저항(R8)(R9)을 통해 공급되는 역 바이어스 상태로 되어'커트-오프'상태로 된다.When the signal switching switch SW is open, the TV signal selection mode is activated. The TV signal input to the terminal 1 is driven by the transistor Q 1 , and then output through the output terminal 3, and then the general video processing is performed. While input into the circuit, the diode D 1 goes into a reverse bias state in which the Vcc voltage is supplied through the resistors R 8 (R 9 ) to the cathode and thus becomes 'cut-off'.

한편, 신호절환스위치(SW)가 개방된 상태이므로 이에의해 혼선제거부(6)내의 트랜지스터(Q4)가 베이스전위를 공급받지 못하여'오프'됨으로써 스위칭부(5)내의 PNP트랜지스터(Q3) 역시 베이스전위가 Vcc전압공급에 의한'HIGH'레벨로 되어 역 바이어스 상태이므로'오프'상태로 된다.On the other hand, since the signal switching switch SW is in an open state, the transistor Q 4 in the crosstalk removing unit 6 is turned off because the base potential is not supplied, thereby causing the PNP transistor Q 3 in the switching unit 5 to be turned off. In addition, since the base potential is at the 'HIGH' level by the Vcc voltage supply and is reverse biased, the base potential is 'off'.

따라서 외부비데오신호구동부(4)내의 트랜지스터(Q2)의 베이스 및 에미터가'LOW'레벨로 되어 이 트랜지스터(Q2) 또한 '오프'상태로 유지됨으로써 단자(2)로 입력된 외부비데오 신호는 차단된 상태에 있게 된다.Accordingly, the base and the emitter of the transistor Q 2 in the external video signal driver 4 are at the 'LOW' level, and the transistor Q 2 is also kept in the 'off' state so that the external video signal input to the terminal 2 is received. Is in a blocked state.

이와같은 상태에서 신호절환 스위치(SW)를 접속시키면, 혼선제거부(6)내의 트랜지스터(Q4)의 베이스로 Vcc전원이 공급되어 도통됨으로써 스위칭부(5)내의 트랜지스터(Q3)의 베이스전위가 'LOW'레벨로 되어 이 트랜지스터(Q3) 또한 도통되는 것이며, 이에의해 외부비데오신호구동부(4)내의 트랜지스터(Q2)역시 순 바이어스 상태로 되어 도통되므로, 단자(2)로 공급되는 외부 비데오신호가 외부비데오신호구동부(4)내의 커플링콘덴서(C2)를 통하고 트랜지스터(Q2)에 의해 구동된 후 출력단자(3)를 통해 일반 비데오처리회로로 입력된다.Thus when connecting the signal change-over switch (SW) in the state, such as, cross-talk base potential of the refuse (6) transistor (Q 4) is Vcc power is supplied to the base-conductive by being a transistor (Q 3) in the switching unit 5 of the in Is at the 'LOW' level, so that the transistor Q 3 is also turned on, and thus the transistor Q 2 in the external video signal driver 4 is also turned on in a forward bias state, so that the outside supplied to the terminal 2 is turned on. The video signal is driven by the transistor Q 2 through the coupling capacitor C 2 in the external video signal driver 4 and then input to the general video processing circuit through the output terminal 3.

한편, 이와 동시에 단자(1)에 입력되는 자체 테레비젼 신호는 전술한 바와 같이 혼선제거부(6)내의 트랜지스터(Q4)의 도통에 의해 다이오드(D1) 및 상기의 도통상태의 트랜지스터(Q4)를 통해 접지(ground)로 바이패스됨으로써 단자(2)로 입력되는 외부비데오신호와의 혼선이 제거되는 것이다.At the same time, the self TV signal input to the terminal 1 is connected to the diode D 1 and the transistor Q 4 in the conduction state by the conduction of the transistor Q 4 in the crosstalk removing unit 6 as described above. By bypassing to ground through the crosstalk with the external video signal input to the terminal 2 is eliminated.

이상과같이 본 고안은 간단한 회로구성에 의하여 입력되는 두 신호간의 혼선을 제거시킨 상태에서 하나의 신호를 절환, 선택할 수 있기 때문에 부품절약과 제품의 공급화에 기여할 수 있는 유용한 고안이다.As described above, the present invention is a useful design that can contribute to component saving and product supply since one signal can be switched and selected in a state in which crosstalk between two signals inputted by a simple circuit configuration is eliminated.

Claims (1)

테레비젼 신호 입력단자(1)와 연결된 트랜지스터(Q1)의 에미터와, 외부비데오신호 입력단자(2)와 연결되는 저항(R2-R5), 콘덴서(C1)(C2) 및 트랜지스터(Q2)로 된 외부비데오신호 구동부(4)의 출력단을 공접한 후 선택신호출력단자(3)에 연결함과 동시에 저항(R1)을 통해 접지시키고, 다이오드(D2) 및 신호절환 스위치(SW)에 의해 Vcc전압을 공급받는 트랜지스터(Q4), 저항(R10)(R11) 및 다이오드(D3)로 된 혼선제거부(6)의 출력단을 다이오드(D1)를 통해 테레비젼 신호입력단자(1)에 연결하는 한편, 저항(R9)을 통해 PNP트랜지스터(Q3) 및 저항(R7)(R8)으로 된 스위칭부(5)에 연결하며, 이 스위칭부(5)내의 트랜지스터(Q3)의 콜렉터를 저항(R6)을 통해 외부비데오신호구동부(4)내의 트랜지스터(Q2)의 콜렉터에 연결하여 두입력신호간의 혼선을 제거시키도록 한 테레비젼의 입력신호 절환회로.Emitter of transistor Q 1 connected to TV signal input terminal 1, resistor R 2 -R 5 , capacitor C 1 (C 2 ) and transistor connected to external video signal input terminal 2. The output terminal of the external video signal driver 4 made of (Q 2 ) is shared and then connected to the selection signal output terminal 3 and grounded through a resistor R 1 , and a diode D 2 and a signal switching switch. The output terminal of the crosstalk remover 6 composed of the transistor Q 4 , the resistor R 10 , R 11 and the diode D 3 supplied with the Vcc voltage by (SW) is provided through the diode D 1 . It is connected to the signal input terminal (1) while connecting to a switching unit (5) consisting of a PNP transistor (Q 3 ) and a resistor (R 7 ) (R 8 ) through a resistor (R 9 ), ) to remove the cross talk between the two input signals over the transistor (Q 3), the resistance (R 6) the collectors of in the connection to the collector of the transistor (Q 2) in the external video signal probe (4) Input signal switching circuit of one TV.
KR2019850005871U 1985-05-20 1985-05-20 Input signal modulating circuit of television KR880002701Y1 (en)

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Application Number Priority Date Filing Date Title
KR2019850005871U KR880002701Y1 (en) 1985-05-20 1985-05-20 Input signal modulating circuit of television

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Application Number Priority Date Filing Date Title
KR2019850005871U KR880002701Y1 (en) 1985-05-20 1985-05-20 Input signal modulating circuit of television

Publications (2)

Publication Number Publication Date
KR860015510U KR860015510U (en) 1986-12-30
KR880002701Y1 true KR880002701Y1 (en) 1988-07-23

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KR2019850005871U KR880002701Y1 (en) 1985-05-20 1985-05-20 Input signal modulating circuit of television

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