KR890000708Y1 - Teletext/computer signal automatic modulating circuit - Google Patents

Teletext/computer signal automatic modulating circuit Download PDF

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Publication number
KR890000708Y1
KR890000708Y1 KR2019850008368U KR850008368U KR890000708Y1 KR 890000708 Y1 KR890000708 Y1 KR 890000708Y1 KR 2019850008368 U KR2019850008368 U KR 2019850008368U KR 850008368 U KR850008368 U KR 850008368U KR 890000708 Y1 KR890000708 Y1 KR 890000708Y1
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South Korea
Prior art keywords
input
teletext
switching circuit
circuit
signal
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KR2019850008368U
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Korean (ko)
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KR870003101U (en
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이철호
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주식회사금성사
허신구
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Publication of KR870003101U publication Critical patent/KR870003101U/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
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/025—Systems for the transmission of digital non-picture data, e.g. of text during the active part of a television frame
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2231/00—Applications
    • H01H2231/036—Radio; TV

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)
  • Color Television Systems (AREA)

Abstract

내용 없음.No content.

Description

텔레텍스트/컴퓨터 신호 자동절환회로Teletext / Computer Signal Switching Circuit

첨부된 도면은 본 고안의 절환회로도이다.The accompanying drawings are switching circuit diagrams of the present invention.

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

1 : 선택 스위칭 회로 2 : 구동회로1: selective switching circuit 2: driving circuit

3 : 동기신호 검출회로 TR1-TR7:트랜지스터3: Sync signal detection circuit TR 1 -TR 7 : Transistor

R1-R4: 저항R 1 -R 4 : Resistance

본 고안은 텔레비젼 수상기를 텔레텍스트(teletext) 또는 컴퓨터의 모니터 (mon itor)장치로 사용함에 있어서 텔레텍스트에서 출력된 R, G, B 아날로그 신호가 입력된면 그 R, G, B 아날로그 신호를 선택하여 구동회로에 입력시키게 하고, R, G, B 아날로그 신호가 입력되지 않으면 컴퓨터에서 출력된 R, G, B 티티엘(TTL : Transistor Trans istor Logic)신호를 선택하여 구동회로에 입력시키게한 텔레텍스트/컴퓨터 신호 자동절환회로에 관한 것이다.The present invention selects the R, G, B analog signals if the R, G, B analog signals output from the teletext are input when using the television receiver as a teletext or a computer mon itor device. If the R, G, and B analog signals are not input, select the R, G, B TTI (Tistor Transistor Trans Logic) signal output from the computer and input it to the drive circuit. It relates to a computer signal automatic switching circuit.

종래에는 사용자가 절환스위치를 절환함에 따라 R, G, B 아날로그 신호 또는 R, G, B 티티엘 신호가 선택되어 구동회로에 입력되게 구성하였으나, 이는 신호를 선택할때마다 일일이 절환스위치를 절환해야 되는 번거로움이 있었다.In the related art, R, G, B analog signals or R, G, B TTI signals are selected and input to the driving circuit as the user switches the changeover switch. However, this is a hassle to switch the changeover switch every time a signal is selected. There was a feeling.

본 고안은 이와같은 종래의 결함을 감안하고, 아날로그 신호가 입력되면, 그 R, G, B 아날로그 신호를 구동회로에 입력시킴과 동시에 R, G, B 아날로그 신호와 함께 입력된 복합영상신호에서 동기신호를 검출하여 R, G, B 티티엘 신호가 구동회로에 입력되지 않게 제어하고, R, G, B 아날로그 신호가 입력되지 않으면, R, G, B 티티엘 신호가 선택되어 출력되게 안출한 것으로 , 이를 첨부된 도면에 의하여 상세히 설명하면 다음과 같다.The present invention takes into account such a conventional deficiency. When an analog signal is input, the R, G, and B analog signals are input to the driving circuit and synchronized with the composite video signal input together with the R, G and B analog signals. It detects the signal and controls the R, G, and B Tiel signals not to be input to the driving circuit, and when the R, G, and B analog signals are not input, the R, G, and B Tiel signals are selected and output. When described in detail with the accompanying drawings as follows.

텔레텍스트의 R, G, B 아날로그 신호 입력단자 (R1)(G1)(B1)가 베이스에 접속된 트랜지스터(TR1)(TR2)(TR3)의 에미터를 저항(R1)(R2)(R3) 및 컴퓨터의 R, G, B 티티엘 신호 입력단자(R1)(G1)(B1)가 스위칭회로(1)의 스위치(SW1)(SW2)(SW3)를 각기 통해 베이스에 접속된 트랜지스터(TR4)(TR5)(TR6)의 에미터에 각기 공통 접속함과 동시에 그 접속점을 구동회로(2)의 입력단자에 접속하고, 텔레텍스트의 복합영상신호 입력단자 (Y)를 동기신호 검출회로(3)를 통해 트랜지스터(TR7)의 베이스에 접속하여 그의 콜렉터를 저항(R4) 및 상기 선택스위칭회로(1)의 제어단자(G)에 접속하여 구성한 것으로, 상기에서 선택스위칭회로(1)는 제어단자(G)에 고전위가 인가될때 스위치(SW1-SW3)가 단락되게 하고, 동기신호 검출회로(3)는 복합영상신호가 입력되어 동기신호가 검출되면 고전위를 출력하게 하며, 도면중 미설명 부호 Vcc는 전원이다.R, G and B analog signal input terminals (R 1 ) (G 1 ) (B 1 ) of the teletext resistor (R 1 ) of the emitters of transistors TR 1 (TR 2 ) (TR 3 ) connected to the base. (R 2 ) (R 3 ) and the computer's R, G, B TTI signal input terminals (R 1 ) (G 1 ) (B 1 ) are switches SW 1 and SW 2 of the switching circuit 1 ( SW 3 ) is commonly connected to the emitters of transistors TR 4 (TR 5 ) and TR 6 connected to the base, respectively, and the connection point is connected to the input terminal of the driving circuit 2, and the teletext is connected. The composite video signal input terminal Y is connected to the base of the transistor TR 7 via the synchronization signal detection circuit 3 and its collector is connected to the resistor R 4 and the control terminal G of the selection switching circuit 1. ), Wherein the selection switching circuit 1 causes the switches SW 1 to SW 3 to be short-circuited when a high potential is applied to the control terminal G, and the synchronization signal detection circuit 3 is a composite image. Signal is input, If the output and outputs a high potential, the drawing reference numeral of Vcc is a power supply.

이와같이 구성된 본 고안의 작용효과를 상세히 설명하면 다음과 같다.Referring to the effects of the present invention configured in this way in detail as follows.

텔레텍스트 R, G, B 아날로그 신호가 입력되면 (R1)(G1)(B1)에 입력되어 트랜지스터(TR1)(TR2)(TR3)의 베이스에 인가되면 그 R, G, B 아날로그 신호는 그의 에미터로 출력되어 구동회로(2)에 입력되고, 또한 복합영상신호 입력단자(Y) 에는 R, G, B 아날로그 신호와 함께 입력되는 복합영상 신호가 입력되고, 동기신호 검출회로(3)는 그 복합영상신호에서 동기신호를 검출하여 그의 출력측에 고전위가 출력되므로 트랜지스터 (TR1)의 베이스에 고전위가 인가되어 온되고, 이에 따라 트랜지스터 (TR1)의 콜렉터 전위가 저전위로 되어 선택스위칭회로(1)의 제어단자(G)에 저전위가 인가되므로 스위치 (SW1-SW3)는 단락되지 않아 입력단자(R2)(G2)(B2)로 입력된 R, G, B 티티엘 신호는 트랜지스터(TR4)(TR5)(TR6)의 베이스에 인가되지 않게 된다.When teletext R, G, B analog signals are input, they are input to (R 1 ) (G 1 ) (B 1 ) and applied to the base of transistors TR 1 (TR 2 ) (TR 3 ). The B analog signal is output to its emitter and input to the driving circuit 2, and the composite video signal input together with the R, G, and B analog signals is input to the composite video signal input terminal Y, and the synchronization signal is detected. circuit 3 is turned on by detecting a synchronizing signal from the composite video signal is applied to the high potential to the base of the transistor (TR 1), so a high potential is output to its output side, so that the collector potential of the transistor (TR 1) Since the low potential is applied to the control terminal G of the selection switching circuit 1 by the low potential, the switches SW 1 to SW 3 are not short-circuited and thus input to the input terminals R 2 (G 2 ) and B 2 . R, G, and B Tiel signals are not applied to the base of the transistors TR 4 (TR 5 ) (TR 6 ).

이와같이 텔레텍스트의 R, G, B 아날로그 신호가 입력되면 그 R, G, B 아날로그 신호는 구동회로(3)에 입력됨과 아울러 동기신호 검출회로(3)가 동기신호를 검출하여 고전위를 출력하게 되므로 선택스위칭회로(1)의 스위치(SW1-SW3)는 모두 개방되어 컴퓨터의 R, G, B 티티엘 신호가 구동회로에 입력되지 않게 된다.When the R, G, B analog signals of teletext are input in this manner, the R, G, B analog signals are input to the driving circuit 3, and the synchronization signal detection circuit 3 detects the synchronization signal and outputs a high potential. Therefore, the switches SW 1 to SW 3 of the selection switching circuit 1 are all opened so that the R, G, and B TTI signals of the computer are not input to the driving circuit.

한편, 입력단자(R1)(G1)(B1)에 R, G, B 아날로그 신호가 입력되지 않으면 복합영상신호(Y)에도 복합 영상신호가 입력되지 않아 동기신호 검출회로(3)에서 검출되는 동기신호가 없으므로 그의 출력측에 저전위가 출력되어 트랜지스터(TR7)는 오프되고, 이에따라 전원(Vcc)이 저항(R4)을 통해 선택스위칭회로(1)의 제어단자(G)에 인가되어 스위치(SW1-SW3)가 모두 단락되므로 입력단자(R2)(G2)(B2)에 입력된 컴퓨터의 R, G, B 티티엘 신호가 스위치(SW1-SW3)를 통해 트랜지스터(TR4)(TR5)(TR6)의 베이스에 인가되어 그의 에미터로 각기 출력되면서 구동회로(2)에 입력된다.On the other hand, if the R, G, B analog signals are not input to the input terminals R 1 (G 1 ) (B 1 ), the composite video signal is not input to the composite video signal (Y). Since there is no sync signal detected, a low potential is output to the output side thereof, so that the transistor TR 7 is turned off, and accordingly, the power supply Vcc is applied to the control terminal G of the selection switching circuit 1 through the resistor R 4 . is through a switch (SW 1 -SW 3) are all short-circuited, so the input terminal (R 2) (G 2) of the computer to input (B 2) R, G, B signal is titiel switches (SW 1 -SW 3) It is applied to the base of the transistors TR 4 , TR 5 , and TR 6 , and outputs to the emitters thereof, respectively, and is input to the driving circuit 2.

이상에서 설명한 바와같이 본 고안은 텔레텍스트의 R, G, B 아날로그 신호가 입력되면 R, G, B 아날로그 신호가 입력되지 않으면 컴퓨터의 R, G, B 티티엘 신호가 선택되어 구동회로(2)에 입력되므로 사용자가 신호를 선택할때 일일이 절환스위칠를 절환해야하는 번거로움을 덜수 있는 효과가 있다.As described above, according to the present invention, when the R, G, and B analog signals of the teletext are input, the R, G, and B TTI signals of the computer are selected to the driving circuit 2 when the R, G, and B analog signals are not input. Since it is input, it is possible to reduce the hassle of changing the switching switch when the user selects a signal.

Claims (1)

텔레텍스트의 R, G, B 아날로그 신호 또는 컴퓨터의 R, G, B 티티엘 신호를 선택하여 구동회로(2)에 입력시키는 절환회로에 있어서, R, G, B 아날로그 신호 입력단자( R1)(G1)(B1)가 베이스에 접속된 트랜지스터(TR1)(TR2)(TR3)의 에미터를 저항 (R1)(R2) (R3) 및 R, G, B 티티엘 신호 입력단자가 선택스위칭회로(1)를 통해 베이스에 접속된 트랜지스터(TR4)(TR5)(TR6)의 에미터, 상기 구동회로(2)의 입력단자에 각기 공통 접속하고, 입력측에 복합영상신호 입력단자(Y)가 접속된 동기신호 검출회로(3)의 출력측을 콜렉터가 상기 선택스위칭회로(1)에 제어단자(G)에 접속된 트랜지스터(TR7)의 베이스에 접속하여 구성함을 특징으로 하는 텔레텍스트/컴퓨터 신호 자동절환회로.In a switching circuit for selecting R, G, B analog signals of teletext or R, G, B TTI signals of a computer and inputting them to the driving circuit 2, R, G, B analog signal input terminals R 1 ( G 1 ) (B 1 ) connects the emitters of transistors TR 1 (TR 2 ) (TR 3 ) connected to the base with resistors (R 1 ) (R 2 ) (R 3 ) and R, G, B Tielel signals The input terminals are commonly connected to the emitters of the transistors TR 4 , TR 5 , and TR 6 connected to the base via the selection switching circuit 1, and to the input terminals of the driving circuit 2, respectively, The output side of the synchronous signal detection circuit 3 to which the video signal input terminal Y is connected is configured by connecting the selector switching circuit 1 to the base of the transistor TR 7 connected to the control terminal G. Teletext / computer signal automatic switching circuit, characterized in that.
KR2019850008368U 1985-07-05 1985-07-05 Teletext/computer signal automatic modulating circuit KR890000708Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019850008368U KR890000708Y1 (en) 1985-07-05 1985-07-05 Teletext/computer signal automatic modulating circuit

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Application Number Priority Date Filing Date Title
KR2019850008368U KR890000708Y1 (en) 1985-07-05 1985-07-05 Teletext/computer signal automatic modulating circuit

Publications (2)

Publication Number Publication Date
KR870003101U KR870003101U (en) 1987-03-19
KR890000708Y1 true KR890000708Y1 (en) 1989-03-13

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KR2019850008368U KR890000708Y1 (en) 1985-07-05 1985-07-05 Teletext/computer signal automatic modulating circuit

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