KR880002700Y1 - External signal selecting circuit in a television channel selection - Google Patents
External signal selecting circuit in a television channel selection Download PDFInfo
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- KR880002700Y1 KR880002700Y1 KR2019850006159U KR850006159U KR880002700Y1 KR 880002700 Y1 KR880002700 Y1 KR 880002700Y1 KR 2019850006159 U KR2019850006159 U KR 2019850006159U KR 850006159 U KR850006159 U KR 850006159U KR 880002700 Y1 KR880002700 Y1 KR 880002700Y1
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- transistor
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- external
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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
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Studio Circuits (AREA)
Abstract
내용 없음.No content.
Description
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 : 외부 오디오신호 입력단자 2 : 오디오 신호 입력부1: External audio signal input terminal 2: Audio signal input unit
4 : 스위칭부 5 : 외부신호 선택채널의 채널접점부4: Switching unit 5: Channel contact unit of external signal selection channel
6 : 외부비데오신호입력단자 7 : 비데오신호 입력부6: External video signal input terminal 7: Video signal input unit
9 : AGC전압 제어부 Q1-Q5: 트랜지스터9: AGC voltage control unit Q 1 -Q 5 : Transistor
D1-D3: 다이오드 R1-R16: 저항D 1 -D 3 : Diodes R 1 -R 16 : Resistance
C1-C5: 콘덴서C 1 -C 5 : Capacitor
본 고안은 비데오 테이프 레코오더와 연결된 테레비젼등의 외부(Audio/Video)신호 입력모드용 테레비젼에 있어서 테레비젼의 특정채널을 선택하여 외부입력신호를 수신할 수 있도록 한 외부신호 선택회로에 대한 것이다.The present invention relates to an external signal selection circuit in which a specific channel of a TV can be received in a TV for an external (Audio / Video) signal input mode such as a TV connected to a video tape recorder to receive an external input signal.
종래에는 외부신호를 수신할 경우, 별도의 입력모드절환용 스위치를 사용하여 이를 절환시킨 후 다시 튜닝전압을 세팅시켜야 하는 불편이 있었다.Conventionally, when receiving an external signal, it was inconvenient to set the tuning voltage again after switching it using a separate input mode switching switch.
본 고안은 테레베젼 채널중 사용하지 않는 채널(마지막 채널등)을 외부입력신호단자로 설정하여 채널선택스위치 자체에서 테레비젼 신호 및 외부신호의 스위칭 기능을 할 수 있도록 회로 구성을 함으로써, 별도의 입력모드 절환스위치가 불필요하고, 사용에 편리하도록 안출한 것으로서, 이를 첨부도면에 의해 상술하면 다음과 같다.The present invention sets up an unused channel (last channel, etc.) among the TV channels as an external input signal terminal, and configures the circuit so that the channel selection switch itself can switch the TV signal and the external signal. The mode switching switch is unnecessary and is designed to be convenient for use, which will be described in detail with reference to the accompanying drawings.
외부입력신호의 오디오 및 비데오신호입력단자(1)(6)에 저항(R4-R9), 콘덴서(C1-C3) 및 버퍼링트랜지스터(Q3)로 된 오디오 신호입력부(2)와 저항(R10-R13), 콘덴서(C5)(C6), 버퍼링트랜지스터(Q4) 및 다이오드(D3)로 된 비데오 신호입력부(7)을 각각 연결하고,전원 단자를 외부신호선택채널의 채널접점부(5)내의 채널접점(a)(a')을 통해 저항(R1-R3), 다이오드(D1) 및 스위칭 트랜지스터(Q1)(Q2)로 된 스위칭부(4)에 연결하며, 이중 PNP트랜지스터(Q2)의 에미터를 B+전원단자에 연결하고, 그 콜렉터를 다이오드(D1)를 통해 오디오신호입력부(2)내의 버퍼링 트랜지스터(Q3)의 에미터에 연결하며, NPN트랜지스터(Q1)의 콜렉터를 B+전원단자에 연결하고, 그 에미터를 저항(R14-R16) 및 트랜지스터(Q5)로 된 AGC전압제어부(9)와 비데오신호입력부(7)의 각 구동전원공급선에 연결한 구성으로서, 미설명부호중는 LD는 채널표시용 LED는 LED 구동전원, b,b'는 채널접점부(5)의 채널접점, 3은 오디오 신호 콘트롤회로, 8은 비데오신호콘트롤회로, 10은 AGC전압단자이다.Audio and video signal input terminals (1) and (6) of the external input signal, and an audio signal input section (2) comprising resistors (R 4 -R 9 ), capacitors (C 1 -C 3 ), and buffering transistors (Q 3 ); Connect the video signal input unit 7 consisting of a resistor (R 10 -R 13 ), a capacitor (C 5 ) (C 6 ), a buffering transistor (Q 4 ) and a diode (D 3 ), respectively. The power supply terminal is connected to the resistors R 1- R 3 , the diode D 1 and the switching transistor Q 1 (Q 2 ) through the channel contacts (a) (a ') in the channel contact part 5 of the external signal selection channel. ) Is connected to the switching unit 4 of (), and the emitter of the double PNP transistor (Q 2 ) is connected to the B + power terminal, and the collector is connected to the buffering transistor in the audio signal input unit (2) through the diode (D 1 ). Connect the emitter of (Q 3 ), connect the collector of the NPN transistor (Q 1 ) to the B + power terminal, and connect the emitter to the AGC voltage of resistors (R 14 -R 16 ) and transistor (Q 5 ). It is a structure connected to each drive power supply line of the control part 9 and the video signal input part 7, and is not described. LD LED for channel display Is an LED driving power supply, b, b 'is a channel contact of the channel contact portion 5, 3 is an audio signal control circuit, 8 is a video signal control circuit, and 10 is an AGC voltage terminal.
상기와 같은 구성인 본 고안의 작용 및 효과는 아래와 같다.The operation and effects of the present invention as the configuration is as follows.
외부신호선택채널(이하 예를들어 11채널이라함)을 선택하여 11채널이 록킹(LOCKING)되면 채널접점부(5)의 접점(a)(a') 및 접점(b)(b')이 각각 접속되어,(33V) 전압이 스위칭부(4)내의 저항(R1)(R2)을 통해 트랜지스터(Q1)의 베이스에 공급되므로 PNP트랜지스터(Q2)는'오프'되고 NPN트랜지스터(Q1)가 도통되어 비데오신호 입력부(7) 및 AGC전압제어부(9)로는 구동전압인 B+전압이 공급됨으로써, 단자(6)를 통해 입력되는 외부비데오 신호가 비데오 신호입력부(7)내의 버퍼링 트랜지스터(Q4)에 의해 구동된 후 다이오드(D3)를 통해 비데오신호 콘트롤회로(8)로 입력됨과 동시에, 단자(1)로 입력되는 외부오디오신호는 오디오신호입력(2)내의 버퍼링 트랜지스터(Q3)에 의해 구동된 후 콘덴서(C4)를 통해 오디오신호 콘트롤회로(3)로 입력됨으로써, 수상관에서는 이 외부 비데오 및 오디오신호에 의한 화면이 디스플레이 되는 것으로서, 이때 AGC전압제어부(9)내의 트랜지스터(Q5)가 전술한 바의 B+구동전압공급에 의해 도통됨으로써 단자(10)에 공급되는 튜너의 AGC전압이 접지쪽으로 바이패스되어'LOW' 레벨(OV)로 되기 때문에 내부의 테레비젼 신호가 외부입력신호에 영향을 미치지 못하게 된다.When the external signal selection channel (hereinafter referred to as 11 channels) is selected and the 11 channels are locked, the contacts (a) (a ') and (b) (b') of the channel contact section 5 are locked. Each connected, Since the (33V) voltage is supplied to the base of the transistor Q 1 through the resistors R 1 and R 2 in the switching section 4, the PNP transistor Q 2 is 'off' and the NPN transistor Q 1 is turned off. The conductive signal is supplied to the video signal input unit 7 and the AGC voltage control unit 9 so that a driving voltage B + voltage is supplied so that an external video signal input through the terminal 6 is buffered transistor Q 4 in the video signal input unit 7. After being driven by the power supply, the external audio signal input to the video signal control circuit 8 through the diode D 3 is input to the buffering transistor Q 3 in the audio signal input 2. Driven by the condenser C 4 and then input to the audio signal control circuit 3, the screen of the external video and audio signal is displayed in the water pipe, and the transistor Q in the AGC voltage controller 9 is displayed. 5) the B + voltage supplied to the driving of the foregoing It is conductive thereby bypass the AGC voltage of a tuner into the ground to be supplied to the terminal 10 is not let the interior of terebijyeon signal affecting an external input signal, since a 'LOW' level (OV).
한편, 11채널이외의 채널이 선택될 경우 즉 테레비젼신호 수신모드로 될 경우에는 채널접점부(5)의 접점(a)(a')이 서로 분리되어 스위칭부(4)로의전압공급이 차단됨으로써, 이 스위칭부(4)내의 트랜지스터(Q1)가'커트-오프'되는 한편 트랜지스터(Q2)가 저항(R3)에 의한 부의 베이스전압공급에 의해 도통되는데, 이에 의해 B+전압이 도통된 트랜지스터(Q2)와 다이오드(D2)를 통해 오디오신호입력부(2)내의 버퍼링 트랜지스터(Q3)의 에미터로 공급되어 이 트랜지스터(Q3)가 역바이어스로 되어'커트-오프'됨으로써 단자(1)로 입력되는 외부오디오신호가 상기의 트랜지스터(Q3)에 의해 차단된다.On the other hand, when a channel other than 11 channels is selected, that is, when the TV signal reception mode is selected, the contacts a and a 'of the channel contact section 5 are separated from each other and are transferred to the switching section 4. As the voltage supply is cut off, the transistor Q 1 in this switching section 4 is 'cut-off' while the transistor Q 2 is turned on by the negative base voltage supply by the resistor R 3 . B + voltage through the conductive transistor (Q 2) and a diode (D 2) is supplied to the emitter of the buffer transistor (Q 3) in the audio signal input (2) and the transistor (Q 3) is in a reverse bias, By being cut-off ', the external audio signal input to the terminal 1 is cut off by the transistor Q 3 .
또한, 전술한 바와같이 스위칭부(4)내의 트랜지스터(Q1)의 '오프'에 의해 비데오신호입력부(7) 및 AGC전압제어부(9)로의 B+전압공급이 차단됨으로써 각 트랜지스터(Q4)(Q5)가 모두'오프'되므로 단자(6)로 입력되는 외부비데오신호가 버퍼링 트랜지스터(Q4)에 의해 차단됨과 동시에 단자(10)에는 정상적인 AGC전압이 유지됨으로써 선택된 채널의 테레비젼신호가 수상관에 디스플레이 되는 것이다.In addition, as described above, the supply of B + voltage to the video signal input unit 7 and the AGC voltage control unit 9 is interrupted by 'off' of the transistor Q 1 in the switching unit 4, thereby providing each transistor Q 4 . Since all of the Q 5 are 'off', the external video signal inputted to the terminal 6 is blocked by the buffering transistor Q 4 , and at the same time, the normal AGC voltage is maintained at the terminal 10 so that the TV signal of the selected channel It is displayed in the correlation.
이상과 같이 본 고안은 외부신호입력 시스템의 테레비젼에 있어서, 입력신호절환을 채널선택에 의해 행할수 있기 때문에 별도의 절환스위치가 불필요하고 사용에 편리한 유용한 고안인 것이다.As described above, in the TV of the external signal input system, since the input signal switching can be performed by channel selection, a separate switching switch is unnecessary and convenient to use.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019850006159U KR880002700Y1 (en) | 1985-05-24 | 1985-05-24 | External signal selecting circuit in a television channel selection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019850006159U KR880002700Y1 (en) | 1985-05-24 | 1985-05-24 | External signal selecting circuit in a television channel selection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR860015507U KR860015507U (en) | 1986-12-30 |
| KR880002700Y1 true KR880002700Y1 (en) | 1988-07-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019850006159U KR880002700Y1 (en) | 1985-05-24 | 1985-05-24 | External signal selecting circuit in a television channel selection |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR880002700Y1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100272605B1 (en) * | 1997-12-30 | 2000-12-01 | 구자홍 | Audio selection type television set |
-
1985
- 1985-05-24 KR KR2019850006159U patent/KR880002700Y1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR860015507U (en) | 1986-12-30 |
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