KR910000103Y1 - Auto-input mode changing circuit for television - Google Patents
Auto-input mode changing circuit for television Download PDFInfo
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- KR910000103Y1 KR910000103Y1 KR2019860011447U KR860011447U KR910000103Y1 KR 910000103 Y1 KR910000103 Y1 KR 910000103Y1 KR 2019860011447 U KR2019860011447 U KR 2019860011447U KR 860011447 U KR860011447 U KR 860011447U KR 910000103 Y1 KR910000103 Y1 KR 910000103Y1
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- switching
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- transistor
- amplifier
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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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
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- Signal Processing (AREA)
- Studio Circuits (AREA)
Abstract
내용 없음.No content.
Description
제1도는 본고안의 회로도.1 is a circuit diagram of this article.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
2 : 비디오 입력부 3 : 비디오증폭 및 주파수보정부2: Video input unit 3: Video amplification and frequency correction
7 : 스위칭IC Q1-Q5: 트랜지스터7: switching IC Q 1 -Q 5 : transistor
R1-R13: 저항 C1-C10: 콘덴서R 1 -R 13 : Resistor C 1 -C 10 : Capacitor
OP : 증폭기 TS : 결합트랜스OP: Amplifier TS: Combined Transformer
본 고안은 외부 신호입력 시스템을 갖는 텔레비젼에 있어서, 자체 텔레비젼신호와 외부비디오신호의 입력모우드가 자동으로 전환되도록한 입력모우드 자동전환회로에 대한 것이다.The present invention relates to an input mode automatic switching circuit which automatically switches the input mode of its own television signal and external video signal in a television having an external signal input system.
종래의 모우드전환회로는 별도의 절환스위치에 의해 텔레비젼신호와 외부비디오신호를 전환시키도록 되어있어 그 조작이 번거로운 폐단이 있었다.Conventional mode switching circuit is to switch the television signal and the external video signal by a separate switching switch, the operation was cumbersome.
본고안의 목적은 이와같은 폐단을 해결하기 위하여, 외부비디오신호가 입력되지 않으면 자체텔레비젼신호 모우드로 동작하다가 외부비디오신호가 입력되면 이를 감지하여 별도의 스위치 조작없이 자동적으로 외부비디오신호 모우드로 전환되도록 안출한 것으로서, 이하 본고안의 구성 및 작용효과를 첨부도면에 의해 상세히 설명한다.The purpose of this paper is to solve this problem, and if the external video signal is not input, it operates as its own television signal mode, and detects when the external video signal is input, and automatically switches to the external video signal mode without any additional switch operation. As a result, the configuration and operation and effect of the present invention will be described in detail by the accompanying drawings.
외부비디오신호 입력단자(1)에 연결되고, 커플링콘덴서(C1)와 트랜지스터(Q1), 저항(R1-R3) 및 결합트랜스(TS)로 된 비디오입력부(2)내의 상기의 결합트랜스(TS)의 2차측에 커플링콘덴서(C3)와 트랜지스터(Q2-Q4), 저역보상용저항(R6) 및 콘덴서(C4) 그리고 고역보상용저항(R8) 및 콘덴서(C5)로 된 비디오증폭 및 주파수보정부(3)를 접속시키는 한편 증폭기(OP)의 입력단에 연결하고, 이 증폭기(OP)의 출력단을 필터링 콘덴서(C8)에 연결함과 동시에 스위칭트랜지스터(Q5)의 베이스에 연결하며, 그 콜렉터를 저항(R12)을 통해 B+전원에 연결함과 동시에 스위칭IC(7)내의 스위칭접점(S1)의 제어단자(CT1)에 연결하고, 그 에미터를 저항(R13)을 통해 접지시킴과 동시에 상기의 스위칭IC(7)내의 다른 스위칭접점(S2)의 제어단자(CT2)에 연결하여, 상기의 비디오증폭 및 주파수보정부(3)의 출력단을 상기의 스위칭접점(S2)의 일단에, 그리고 통상의 텔레비젼신호중간주파증폭 및 감지회로(6)의 출력단을 상기의 스위칭접점(S1)의 일단에 각각 연결한 구성으로서, 미설명 부호중 B1 +는 직류전원, C2, C6, C7, C9, C10은 필터링 및 채터링방지용 콘덴서, R4, R5, R7, R8, R9, R10, R11, R14는 저항, 4는 수신안테나, 5는 텔레비젼신호 수신회로, 8은 텔레비젼의 내부회로, 9는 CRT이다.The video input unit 2 connected to the external video signal input terminal 1 and comprising a coupling capacitor C 1 , a transistor Q 1 , a resistor R 1 -R 3 , and a coupling transformer TS. Coupling capacitor (C 3 ) and transistor (Q 2 -Q 4 ), low compensation resistor (R 6 ) and capacitor (C 4 ) and high compensation resistor (R 8 ) on the secondary side of the coupling transformer (TS) and Connect the video amplification and frequency compensator 3 of the capacitor C 5 to the input of the amplifier OP, and connect the output of the amplifier OP to the filtering capacitor C 8 and switch simultaneously. It is connected to the base of transistor Q 5 , which is connected to the control terminal CT 1 of the switching contact S 1 in the switching IC 7 simultaneously with the collector connected to the B + power supply via a resistor R 12 . and by connecting its emitter to the control terminal of the other switching points (S 2) in the Sikkim ground through a resistance (R 13) and at the same time the switching IC (7) of the (CT 2), wherein the video The amplification and frequency correction unit 3, the switching contact (S 2) end in, and a conventional television signal intermediate frequency amplifier and detection circuit 6, the switching contact (S 1) of the output stage of the of the output end of the end Each of these components is connected to each other, where B 1 + is a DC power supply, C 2 , C 6 , C 7 , C 9 , and C 10 are filtering and chattering prevention capacitors, R 4 , R 5 , R 7 , R 8 , R 9 , R 10 , R 11 , and R 14 are resistors, 4 is a receiving antenna, 5 is a television signal receiving circuit, 8 is a television internal circuit, and 9 is a CRT.
이와같이 구성된 본고안의 회로동작상태는 다음과 같다.The circuit operation state of the present invention thus constructed is as follows.
먼저, 자체 텔레비젼신호수신시 안테나(4)를 통해 수신된 방송신호는 각 신호처리회로(5)(6)를 통해 스위칭IC(7)내의 스위칭접점(S1)의 일단에 인가된다.First, the broadcast signal received through the antenna 4 at the time of receiving the own television signal is applied to one end of the switching contact S 1 in the switching IC 7 through each signal processing circuit 5, 6.
이때, 단자(1)로는 외부비디오신호가 입력되지 않으므로 비디오입력부(2)내의 결합트랜스(TS)를 통해서는 비디오신호가 검출되지 않으며, 이에의해 증폭기(OP)에 의한 비디오신호의 증폭도 없으므로 트랜지스터(Q5)의 베이스가 ′로우′레벨로 되어 이 트랜지스터(Q5)가 ′오프′된다.At this time, since the external video signal is not input to the terminal 1, the video signal is not detected through the combined transformer TS in the video input unit 2, and thus the transistor does not amplify the video signal by the amplifier OP. The base of Q 5 is at the 'low' level, and this transistor Q 5 is 'off'.
따라서 저항(R12)을 통한 B+전압공급에 의해 스위칭IC(7)내의 제어단자(CT1)가 ′하이′레벨로 되어 스위칭접점(S1)이 ′온′상태로 되므로 중간 주파증폭 및 검파회로(6)에서 출력된 텔레비젼신호가 이 스위칭접점을 통해 내부회로(8)로 입력됨으로써 화면에는 텔레비젼신호를 수상할 수 있게 된다.Therefore, the control terminal CT 1 in the switching IC 7 is brought to the 'high' level by the supply of B + voltage through the resistor R 12 , and the switching contact S 1 is turned on. The television signal output from the detection circuit 6 is input to the internal circuit 8 through this switching contact, so that the television signal can be received on the screen.
이때 스위칭IC (7)내의 제어단자(CT2)는 저항(R13)을 통해 접지로 연결되어 ′로우′레벨로 됨으로써 스위칭접점(S2)은 ′오프′된다.At this time, the control terminal CT 2 in the switching IC 7 is connected to the ground through the resistor R 13 to the 'low' level, so that the switching contact S 2 is 'off'.
한편, 이와같은 텔레비젼신호수신모우드상태에서 단자(1)로 외부비디오신호가 입력되면, 이 비디오신호가 비디오입력부(2)내의 커플링 콘덴서(C1)를 거쳐서 트랜지스터(Q1)에 의해 구동된 후 결합트랜스(TS)로 입력됨으로써, 이 결합트랜스(TS)의 2차측에도 외부비디오신호가 전달된다.On the other hand, when an external video signal is input to the terminal 1 in such a television signal receiving mode, the video signal is driven by the transistor Q 1 via the coupling capacitor C 1 in the video input unit 2. After being input to the combined transformer TS, an external video signal is also transmitted to the secondary side of the combined transformer TS.
이렇게 전달된 외부비디오신호는 비디오증폭 및 주파수보정부(3)로 입력되어 내부회로(8)의 주파수특성에 맞도록 보정증폭되어 스위칭IC(7)내의 스위칭접점(S2)의 일단에 공급된다.The external video signal thus transmitted is input to the video amplification and frequency compensator 3, and amplified and corrected according to the frequency characteristics of the internal circuit 8, and supplied to one end of the switching contact S 2 in the switching IC 7. .
또한 결합트랜스(TS)의 2차측에 전달된 외부비디오신호의 일부는 증폭기(OP)에 의해 충분한 증폭이 된 후 교류성분 필터링 콘덴서(C8)에 의해 직류전압으로 바뀌어 트랜지스터(Q5)의 베이스에 인가됨으로써, 이 트랜지스터(Q5)가 도통되어 그 에미터출력이 스위칭IC(7)내의 제어단자(CT2)로 공급된다.In addition, a part of the external video signal transmitted to the secondary side of the coupling transformer TS is sufficiently amplified by the amplifier OP, and is then converted into a DC voltage by the AC component filtering capacitor C 8 to convert the base of the transistor Q 5 to a base. When applied to the transistor Q 5 , the transistor Q 5 is turned on, and its emitter output is supplied to the control terminal CT 2 in the switching IC 7.
따라서=이 제어단자(CT2) 전압이 ′하이′레벨로 되어 스위칭접점(S2)이 ′온′상태로 됨으로써, 비디오증폭 및 주파수보정부(3)에서 출력된 외부비디오신호가 이 스위칭접점(S2)을 통해 텔레비젼의 내부회로로 공급되어 화면에서는 외부비디오신호를 수상할 수 있게 된다.Therefore, when the control terminal CT 2 voltage becomes 'high' level and the switching contact S 2 becomes 'on' state, the external video signal outputted from the video amplification and frequency compensator 3 becomes the switching contact. It is supplied to the internal circuit of the television through S 2 to receive an external video signal on the screen.
이때, 스위칭IC(7)내의 제어단자(CT1)는 트랜지스터(Q5)가 도통됨에 의해 ′로우′레벨로 되므로 스위칭접점(S1)은 ′오프′상태로 되어 자체 텔레비젼신호는 이 스위칭접점(S1)에 의해 차단된 상태에 있게 된다.At this time, the control terminal CT 1 in the switching IC 7 is at the 'low' level when the transistor Q 5 is turned on, so that the switching contact S 1 is in the 'off' state, so that the own television signal is the switching contact. It is in the state blocked by (S 1 ).
이상과 같이 본고안은 자체 텔레비젼신호와 외부비디오신호의 입력모우드가 별도의 절환스위치의 조작없이 자동적으로 이루어짐으로써, 사용에 편리하고 제품의 고급화를 이룩한 유용한 고안이다.As described above, the present invention is a useful design that is easy to use and high quality of the product, since the input mode of the television signal and the external video signal is automatically made without the operation of a separate switching switch.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019860011447U KR910000103Y1 (en) | 1986-07-31 | 1986-07-31 | Auto-input mode changing circuit for television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019860011447U KR910000103Y1 (en) | 1986-07-31 | 1986-07-31 | Auto-input mode changing circuit for television |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR880003645U KR880003645U (en) | 1988-04-14 |
| KR910000103Y1 true KR910000103Y1 (en) | 1991-01-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019860011447U KR910000103Y1 (en) | 1986-07-31 | 1986-07-31 | Auto-input mode changing circuit for television |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR910000103Y1 (en) |
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1986
- 1986-07-31 KR KR2019860011447U patent/KR910000103Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR880003645U (en) | 1988-04-14 |
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