KR20000003200A - Cross talk eliminating method - Google Patents
Cross talk eliminating method Download PDFInfo
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- KR20000003200A KR20000003200A KR1019980024381A KR19980024381A KR20000003200A KR 20000003200 A KR20000003200 A KR 20000003200A KR 1019980024381 A KR1019980024381 A KR 1019980024381A KR 19980024381 A KR19980024381 A KR 19980024381A KR 20000003200 A KR20000003200 A KR 20000003200A
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- signal
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- tuner
- output terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/911—Television signal processing therefor for the suppression of noise
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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
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
Description
본 발명은 TV시스템의 크로스토크 제거방법에 관한 것으로, 특히 외부 입출력단자를 통한 비데오신호 수신시 RF신호에 의해 IC내부에서 발생하는 크로스토크를 제거하기 위한 방법에 관한 것이다.The present invention relates to a crosstalk removing method of a TV system, and more particularly, to a method for removing crosstalk generated in an IC by an RF signal when a video signal is received through an external input / output terminal.
일반적으로, TV시스템은 자체 내장된 튜너부로부터 수신된 방송신호를 화면상에 디스플레이하거나, AV단자를 통해 외부 입력기기(예: VCR)등에서 재생된 복합영상신호(CVBS)를 입력받아 화면상에 디스플레이한다. TV시스템은 튜너부에서 수신되는 신호 또는 AV단자를 통한 외부 입력신호를 선택하는 스위칭IC를 구비하고 있으며, 스위칭IC에서 선택된 영상 및 음성신호를 출력한다. 예를들어, 튜너부를 통해 수신되는 TV신호를 수신하다가 AV단자를 통해 VCR에서 입력되는 신호를 수신하고자 할 때, 스위칭IC는 AV단자로 절환된다. 그래서, AV단자를 통해 입력되는 복합영상신호를 출력한다. 이때, 스위칭IC 내부에서는 튜너부의 RF신호에 의한 크로스토크가 일어날 수 있다. 즉, VCR모드로 절환되었지만, 기존에 튜너부에서 수신하는 RF신호에 의해 간섭현상이 발생하여 화면 및 음성이 흔들리는 현상이 일어난다.In general, a TV system displays a broadcast signal received from a built-in tuner unit on a screen, or receives a composite video signal (CVBS) reproduced from an external input device (eg, a VCR) through an AV terminal on a screen. Display. The TV system includes a switching IC for selecting a signal received from the tuner or an external input signal through the AV terminal, and outputs a video and audio signal selected by the switching IC. For example, when receiving a TV signal received through the tuner unit and trying to receive a signal input from the VCR through the AV terminal, the switching IC is switched to the AV terminal. Thus, the composite video signal input through the AV terminal is output. At this time, crosstalk may occur due to an RF signal of the tuner unit inside the switching IC. That is, although switched to the VCR mode, interference phenomenon occurs due to the RF signal received by the tuner, and the screen and the voice shake.
본 발명의 목적은 위와같은 문제점을 해결하기 위해, TV방송을 수신하기 위한 회로중 IC내부에서 발생되는 무선주파수(RF)신호와 외부 입출력신호(AV)간의 크로스토크를 방지하여 수신채널의 화면 및 음성을 간섭없는 상태로 수신하는 크로스토크 제거방법을 제공하는데 있다.SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to prevent crosstalk between a radio frequency (RF) signal and an external input / output signal (AV) generated inside an IC of a circuit for receiving a TV broadcast, and The present invention provides a crosstalk cancellation method for receiving voice without interference.
도 1은 본 발명에 적용된 크로스토크 제거장치를 나타낸 구성도,1 is a block diagram showing a crosstalk removing apparatus applied to the present invention,
도 2는 본 발명의 크로스토크 제거방법을 설명하기 위한 흐름도.2 is a flowchart illustrating a crosstalk removing method of the present invention.
※ 도면의 주요 부분에 대한 부호의 설명※ Explanation of codes for main parts of drawing
11 : 튜너부 12 : 신호처리부11: tuner unit 12: signal processing unit
13 : 키입력부 14 : 마이콤13: key input 14: micom
15 : 영상신호출력부 17 : 음성신호출력부15: video signal output unit 17: audio signal output unit
위와같은 목적을 달성하기 위한 본 발명의 특징은 방송신호(RF)를 수신하는 튜너부와 복합영상신호를 인가받기 위한 외부 입출력단을 구비한 영상기기의 크로스토크제거를 위한 방법에 있어서, 상기 외부 입출력단을 통해 복합영상신호가 입력될 때, 상기 튜너부의 채널수신을 위해 출력되는 소정크기의 전압을 변경하여 상기 튜너부의 RF신호 수신을 방지하는 것을 특징으로 하는 크로스토크 제거방법에 있다.A feature of the present invention for achieving the above object is a method for crosstalk removal of a video device having a tuner unit for receiving a broadcast signal (RF) and an external input and output terminal for receiving a composite video signal, the external When a composite video signal is input through an input / output terminal, a crosstalk removing method may be configured to prevent the tuner unit from receiving an RF signal by changing a voltage having a predetermined magnitude output for channel reception of the tuner unit.
이하, 첨부된 도면을 참조하여 본 발명의 바람직한 일 실시예를 상세히 설명하겠다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 1은 본 발명에 적용된 크로스토크제거장치를 도시한 도면이다. 도 1장치는 방송신호를 수신하는 튜너부(11)를 구비한다. 그리고, 튜너부(11)의 후단에는 수신된 방송신호를 신호처리하여 출력하는 신호처리부(12)가 연결된다. 스위칭IC(15)는 신호처리부(12)의 출력단(a)과, 외부신호 입출력단(b)중 어느 하나로부터 출력되는 신호를 선택하여 영상신호출력부(16) 및 음성신호출력부(17)로 출력한다. 마이콤(14)은 키입력부(13)로부터 인가되는 모드절환신호에 따라 스위칭IC(15)를 제어하고, 튜너부(11)의 전원공급(VT)을 제어하도록 구성된다. 본 발명의 실시예에서, 스위칭IC(15)의 외부 입출력단(b)은 여러 가지의 외부 기기중 VCR과 연결되어 VCR신호를 출력한다고 정한다.1 is a view showing a crosstalk removing apparatus applied to the present invention. 1 includes a tuner unit 11 for receiving a broadcast signal. The rear end of the tuner unit 11 is connected to a signal processor 12 which processes and outputs the received broadcast signal. The switching IC 15 selects a signal output from any one of an output terminal a of the signal processing unit 12 and an external signal input / output terminal b, so that the image signal output unit 16 and the audio signal output unit 17 are selected. Will output The microcomputer 14 is configured to control the switching IC 15 according to the mode switching signal applied from the key input unit 13 and to control the power supply V T of the tuner unit 11. In the embodiment of the present invention, it is determined that the external input / output terminal (b) of the switching IC 15 is connected to the VCR among various external devices to output the VCR signal.
도 2는 본 발명의 크로스토크 제거방법을 설명하기 위한 흐름도이다. 도 1 및 도 2를 참조하여 본 발명을 상세히 설명하겠다.2 is a flowchart illustrating a crosstalk removing method of the present invention. The present invention will be described in detail with reference to FIGS. 1 and 2.
먼저, 마이콤(14)은 AV모드인지 판단한다(제 210단계). 즉, 스위칭IC(15)에서 외부 입출력단(b)을 선택하여 VCR출력단과 연결되었는지 판단한다. AV모드가 아니면, 즉, 키입력부(13)로부터 TV모드선택신호가 입력되면, 마이콤(14)은 튜너부(11)와 연결된 출력단(a)을 선택하는 스위칭제어신호를 스위칭IC(15)로 출력한다. 이에 따라, 신호처리부(12)에서 신호처리된 방송신호는 스위칭IC(15)를 통해 영상신호출력부(16) 및 음성신호출력부(17)로 인가된다. 이상과 같은 설명은 일반적인 TV의 기능과 동일하므로, 이에 대한 흐름도는 생략하였다.First, the microcomputer 14 determines whether the AV mode (operation 210). That is, the switching IC 15 selects the external input / output terminal b to determine whether it is connected to the VCR output terminal. If it is not the AV mode, that is, when the TV mode selection signal is input from the key input unit 13, the microcomputer 14 sends a switching control signal for selecting the output terminal a connected to the tuner unit 11 to the switching IC 15. Output Accordingly, the broadcast signal processed by the signal processor 12 is applied to the video signal output unit 16 and the audio signal output unit 17 through the switching IC 15. Since the above description is the same as that of a general TV, a flowchart thereof is omitted.
한편, AV모드이면 즉, 키입력부(13)로부터 VCR모드선택신호가 입력되면 마이콤(14)은 외부 입출력단(b)을 선택하는 스위칭제어신호를 스위칭IC(15)로 출력하고, 튜너부(11)의 자동이득제어(AGC; Automatic Gain Control)를 무효화한다(제 220단계). 이에 따라, 외부 입출력단을 외부에 연결된 VCR로부터 복합영상신호를 입력받는다. 그리고, 영상신호출력부(16) 및 음성신호출력부(17)는 VCR의 복합영상신호를 출력한다. 이때, 마이콤(14)은 튜너부(11)에서 수신하고 있던 채널에 해당하는 전압에 해당하는 값을 0V가 되도록 변경한다(제 230단계). 따라서, 튜너부(11)는 채널전압이 0V가 됨으로서 RF신호를 수신하지 못하는 상태가 된다(제 240단계). 따라서, TV 신호와 VCDR 신호간에 발생할 수 있는 크로스토크가 제어된다. 되어 크로스토크를 방지한다(제 240단계).On the other hand, in the AV mode, that is, when the VCR mode selection signal is input from the key input unit 13, the microcomputer 14 outputs a switching control signal for selecting the external input / output terminal b to the switching IC 15, and the tuner unit ( 11, the automatic gain control (AGC) is invalidated (step 220). Accordingly, the composite video signal is received from the VCR connected to the external input / output terminal. The video signal output unit 16 and the audio signal output unit 17 output the composite video signal of the VCR. At this time, the microcomputer 14 changes the value corresponding to the voltage corresponding to the channel received by the tuner unit 11 to be 0V (step 230). Accordingly, the tuner unit 11 does not receive the RF signal because the channel voltage becomes 0V (step 240). Thus, crosstalk that may occur between the TV signal and the VCDR signal is controlled. To prevent crosstalk (step 240).
상술한 바와같이, 본 발명은 외부 입출력단자를 통한 비데오신호 수신시, 튜너부의 채널전압을 OV로 조절함으로써 RF신호에 의해 IC내부에서 발생하는 크로스토크를 방지하여 영상 및 음성의 흔들림을 보정할 수 있는 효과가 있다.As described above, in the present invention, when receiving a video signal through an external input / output terminal, by adjusting the channel voltage of the tuner to OV, it is possible to correct the shaking of video and audio by preventing crosstalk generated inside the IC by the RF signal. It has an effect.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980024381A KR100288966B1 (en) | 1998-06-26 | 1998-06-26 | Cross talk removal method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980024381A KR100288966B1 (en) | 1998-06-26 | 1998-06-26 | Cross talk removal method |
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| KR20000003200A true KR20000003200A (en) | 2000-01-15 |
| KR100288966B1 KR100288966B1 (en) | 2001-05-02 |
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| JPH04259173A (en) * | 1991-02-13 | 1992-09-14 | Mitsubishi Electric Corp | Video input changeover circuit |
| JPH089252A (en) * | 1994-06-22 | 1996-01-12 | Matsushita Electric Ind Co Ltd | Video signal switching circuit |
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