KR920008836Y1 - Tv signal processing apparatus - Google Patents
Tv signal processing apparatus Download PDFInfo
- Publication number
- KR920008836Y1 KR920008836Y1 KR2019900006422U KR900006422U KR920008836Y1 KR 920008836 Y1 KR920008836 Y1 KR 920008836Y1 KR 2019900006422 U KR2019900006422 U KR 2019900006422U KR 900006422 U KR900006422 U KR 900006422U KR 920008836 Y1 KR920008836 Y1 KR 920008836Y1
- Authority
- KR
- South Korea
- Prior art keywords
- signal
- teletext
- section
- transistor
- blanking
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0079—Receiver details
- H04L7/0083—Receiver details taking measures against momentary loss of synchronisation, e.g. inhibiting the synchronisation, using idle words or using redundant clocks
-
- 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
- H04N5/63—Generation or supply of power specially adapted for television receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
- H04N7/087—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only
- H04N7/088—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital
- H04N7/0882—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital for the transmission of character code signals, e.g. for teletext
Abstract
내용 없음.No content.
Description
제1도는 본 고안의 회로도.1 is a circuit diagram of the present invention.
제2도는 본 고안의 구성도.2 is a block diagram of the present invention.
제3도는 본 고안의 파형도.3 is a waveform diagram of the present invention.
제4도는 종래의 구성도.4 is a conventional configuration diagram.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
Q1, Q2: 트랜지스터 C1: 콘덴서Q 1 , Q 2 : Transistor C 1 : Condenser
R1-R5: 저항 D1-D3: 다이오드R 1 -R 5 : Resistor D 1 -D 3 : Diode
본 고안은 텔레텍스트 신호의 동기신호 손상방지 회로에 관한 것으로서 특히 핍(pip) 기능과 배속주사변환(DOUBLE SCANING) 기능의 티브이에 텔레텍스트를 적용하기 위하여 적녹청(RGB) 상태의 텔레텍스트신호를 합성 영상신호로 변환하였을때 발생될 수 있는 동기신호 손상방지회로에 관한 것이다.The present invention relates to a synchronization signal damage prevention circuit of a teletext signal, and in particular, to apply a teletext to a TV having a pip function and a double scan switching function, a red text (RGB) teletext signal is used. The present invention relates to a synchronization signal damage prevention circuit that can be generated when converted into a composite video signal.
제4도는 종래의 텔레텍스트 기능 티브이의 구성을 나타낸다.4 shows the configuration of a conventional teletext function TV.
종래에는 핍기능과 배속변환기능이 적용되지 않았기 때문에 텔레텍스트 신호처리부출력인 적녹청신호를 그대로 티브이 방송 적녹청신호와 절환하여 사용하였으나 이는 텔레텍스트 적녹청 출력신호를 그대로 배속 변환시 메모리를 사용하여야 하므로 회로가 복잡해지고 가격이 비싸지며 핍신호처리시 회로의 간략하를 위하여 적색휘도, 청색휘도 신호를 사용하므로 텔레텍스트 적녹청 신호를 핍에 적용하기 위하여서는 적녹성 신호를 색차신호로 변환시켜야만 하는 복잡성이 있어 본 고안은 이런 제결함을 시정보완하기 위하여 핍기능 혹은 배속주사변환기능의 티브이에 텔레텍스트 기능이 가능하도록 하는 방법에 있어서 신호처리를 용이하게 하기 위하여 텔레텍스트 적녹청신호를 합성영상신호로 변환하여 사용하는 방법에 적용된다.Conventionally, since the pip function and the double speed conversion function are not applied, the red text signal, which is the output of the teletext signal processing unit, is used as it is, while the red broadcast signal is converted to the TV broadcast red cyan signal. As the circuit is complicated and expensive, red and blue luminance signals are used to simplify the circuit in the pip signal processing. Therefore, in order to apply the teletext red and green signal to the pip, the complexity of converting the red and green signals to the color difference signal is required. In order to solve such defects, the present invention provides a teletext function for a TV of a pip function or a double speed scan conversion function. Applies to the method of conversion.
이를 첨부도면에 의거하여 상세히 설명하면 다음과 같다.When described in detail based on the accompanying drawings as follows.
제2도와 같이 스위치(SW1)에서는 티브이 방송신호와 합성영상신호로 변환된 텔레텍스트신호를 선택한다.As shown in FIG. 2, the switch SW 1 selects a teletext signal converted into a TV broadcast signal and a composite video signal.
이때 스위칭신호는 텔레텍스트 신호처리부에서 출력되는 브랭킹신호를 사용한다. 이때 합성영상신호로 변환된 텔레텍스트신호는 처리과정을 거치는 동안 약간의 지연이 생겨 티브이 방송신호보다 약간 지연된 신호가 되므로 서로 동기신호의 시점이 일치하지 않는다.In this case, the switching signal uses a blanking signal output from the teletext signal processor. In this case, the teletext signal converted into the composite video signal is slightly delayed during the processing, and thus becomes slightly delayed from the TV broadcast signal.
제3도의 티브이 방송시청구간(1) 및 텔레텍스트신호대기구간(2)은 문제가 되지 않으나 텔레텍스트 신호신청구간(3)은 다음과 같은 문제가 생긴다.The TV broadcast viewing section 1 and the teletext signal waiting section 2 of FIG. 3 are not a problem, but the teletext signal request section 3 has the following problems.
즉 텔레텍스트 블랭킹신호는 수평블랭킹구간 동안은 하이신호로 출력되므로 스위치의 출력은 텔레텍스트 블랭킹신호는 수평블랭킹구간 동안은 하이신호로 출력되므로 스위치의 출력은 텔레텍스트 블랭킹신호가 하이 신호인 동안은 시점이 맞지 않는 티브이 방송신호의 동기신호가 선택되며 텔레텍스트 브랭킹신호가 로우신호인 구간은 텔레텍스트신호가 출력된다. 따라서 동기신호부분이 손상된 텔레텍스트신호가 출력된다.In other words, since the teletext blanking signal is output as a high signal during the horizontal blanking period, the teletext blanking signal is output as a high signal during the horizontal blanking period, so that the output of the switch is displayed when the teletext blanking signal is a high signal. The synchronization signal of the TV broadcast signal that is not matched is selected, and the teletext signal is output in a section in which the teletext blanking signal is a low signal. Therefore, a teletext signal with a damaged sync signal portion is output.
즉 텔레텍스트 시청시 수평동기가 불안해지며 심할 경우 수평동기가 무너진다.In other words, when watching teletext, horizontal sync becomes unstable, and in severe cases, horizontal sync is broken.
제1도는 본 고안의 회로도로서 제3도의 티브이 방송시청구간(1) 및 텔레텍스트신호대기구간(2)은 텔레텍스트 블랭신호에 전혀 영향을 미치지 않으며 텔레텍스트신호시청구간(3) 동안만 텔레텍스트블랭킹 신호의 완전하게 로우신호로 출력시키기 위한 회로이다.FIG. 1 is a circuit diagram of the present invention, and the TV broadcast section 1 and the teletext signal waiting section 2 of FIG. 3 have no influence on the teletext blank signal, and the teletext signal viewing section 3 is only teletext. It is a circuit for outputting a completely low signal of a blanking signal.
티브이 방송시청구간(1)은 입력된 텔레텍스트블랭킹신호는 하이신호가 계속되므로 트렌지스터(Q1)의 콜렉터에서는 로우신호가 되고 트랜지스터(Q2)의 콜렉터는 하이신호가되므로 다이오드(D3)를 통하여 공급되는 텔레텍스트 블랭킹신호는 그대로 하여 하이신호로 인가된다.TV broadcast viewing section 1 includes an input teletext blanking signal is a diode (D 3), the collector because the high signal of the transistor (Q 1) is a Low signal and the transistor (Q 2), the collector of since the high signal continues The teletext blanking signal supplied through is applied as a high signal as it is.
텔레텍스트 신호대기구간(2)은 자막구간만 로우신호가 되고 나머지 구간을 하이신호가 되므로 로우신호구간보다 하이신호 구간이 더큰 상태이므로 텔레텍스트 블랭킹신호가 입력된다. 트랜지스터(Q1)에서는 반전되므로 로우신호구간이 하이신호구간보다 더큰상태가 되고 저항(R2)과 콘덴서(C1)에 의해 적분이 되고 로우신호상태가 하이신호상태보다 더큰 상탱므로 적분된 직류전압은 기준전압(B+)에 비하여 낮은 전압이 되고 저항(R3), (R4)을 통하여 분압된 전압이 트랜지스터(Q2)의 베이스에 공급되므로 트랜지스터(Q2)를 온시키지 못한다. 따라서 트랜지스터(Q2)의 콜렉터는 하이신호가 되고 다이오드(D3)를 통하여 공급되는 텔레텍스트 블랭킹신호는 변형없이 스위치에 인가된다.Since the teletext signal waiting period 2 becomes a low signal only in the subtitle section and becomes a high signal in the remaining section, the teletext blanking signal is input since the high signal section is larger than the low signal section. Since the transistor Q 1 is inverted, the low signal section becomes larger than the high signal section, is integrated by the resistor R 2 and the capacitor C 1 , and the low signal state is larger than the high signal. voltage is a voltage lower than the reference voltage (B +) resistance (R 3), (R 4 ) , because the voltage is supplied to the base of the transistor (Q 2) divided by the transistor fails to turn on the (Q 2). Thus, the collector of transistor Q 2 becomes a high signal and the teletext blanking signal supplied through diode D 3 is applied to the switch without modification.
텔레텍스트신호신청구간(3)은 수평블랭킹 구간만 하이신호가 되고 나머지 구간의 로우신호인 텔레텍스트 블랭킹신호가 입력된다.In the teletext signal application section 3, only the horizontal blanking section becomes a high signal and a teletext blanking signal, which is a low signal of the remaining section, is input.
로우신호구간이 하이신호구간보다 콘상태이므로 트랜지스터(Q1)에서 반전된 신호는 하이신호구간이 로우신호구간보다 더큰 상태가 되고 저항(R2)과 콘덴서(C1)에 의하여 적분된 직류전압은 기준전압(B+)에 가까운 높은 전압이 된다.Since the low signal section is in the cone state higher than the high signal section, the signal inverted by the transistor Q 1 has a high signal section larger than the low signal section and the DC voltage integrated by the resistor R 2 and the capacitor C 1 . Becomes a high voltage close to the reference voltage (B + ).
따라서 트랜지스터(Q2)가 온되고 트랜지스터(Q2)이 콜렉터는 로우상태가 되므로 다이오드(D2)가 온되어 다이오드(D3)를 통하여 공급되는 텔레텍스트 블랭킹 신호에 관계없이 스위치에는 계속 로우상태가 인가된다.Thus, transistor Q 2 is turned on and transistor Q 2 is in a collector low state, so diode D 2 is on and remains low in the switch regardless of the teletext blanking signal supplied through diode D 3 . Is applied.
즉 텔레텍스트 시청구간(3)에 텔레텍스트블랭킹 신호가 계속 로우신호가 되므로 동기신호를 포함한 완전한 텔레텍스트신호가 스위치에서 선택된다.That is, since the teletext blanking signal continues to be a low signal in the teletext viewing section 3, the complete teletext signal including the synchronization signal is selected by the switch.
따라서 상기와 같은 동기신호손상을 방지할 수 있고 본 고안의 효과는 염가의 단순한 회로구조로써 합성영상신호로 변환된 텔레텍스트신호의 동기신호의 손상을 방지할 수 있다.Therefore, it is possible to prevent the synchronization signal damage as described above, and the effect of the present invention is to prevent the damage of the synchronization signal of the teletext signal converted into the composite video signal with a simple and inexpensive circuit structure.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019900006422U KR920008836Y1 (en) | 1990-05-15 | 1990-05-15 | Tv signal processing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019900006422U KR920008836Y1 (en) | 1990-05-15 | 1990-05-15 | Tv signal processing apparatus |
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| Publication Number | Publication Date |
|---|---|
| KR910021262U KR910021262U (en) | 1991-12-20 |
| KR920008836Y1 true KR920008836Y1 (en) | 1992-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019900006422U KR920008836Y1 (en) | 1990-05-15 | 1990-05-15 | Tv signal processing apparatus |
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| Country | Link |
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| KR (1) | KR920008836Y1 (en) |
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1990
- 1990-05-15 KR KR2019900006422U patent/KR920008836Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
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| KR910021262U (en) | 1991-12-20 |
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