KR20010018952A - A power cut off apparatus of the velocity modulation circuit - Google Patents

A power cut off apparatus of the velocity modulation circuit Download PDF

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Publication number
KR20010018952A
KR20010018952A KR1019990035117A KR19990035117A KR20010018952A KR 20010018952 A KR20010018952 A KR 20010018952A KR 1019990035117 A KR1019990035117 A KR 1019990035117A KR 19990035117 A KR19990035117 A KR 19990035117A KR 20010018952 A KR20010018952 A KR 20010018952A
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KR
South Korea
Prior art keywords
modulation circuit
signal
received
velocity modulation
speed
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Application number
KR1019990035117A
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Korean (ko)
Inventor
최운현
Original Assignee
윤종용
삼성전자 주식회사
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Application filed by 윤종용, 삼성전자 주식회사 filed Critical 윤종용
Priority to KR1019990035117A priority Critical patent/KR20010018952A/en
Publication of KR20010018952A publication Critical patent/KR20010018952A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/30—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical otherwise than with constant velocity or otherwise than in pattern formed by unidirectional, straight, substantially horizontal or vertical lines
    • H04N3/32—Velocity varied in dependence upon picture information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/18—Generation of supply voltages, in combination with electron beam deflecting

Abstract

PURPOSE: A device for cutting off power of a velocity modulation circuit is provided to cut off power supplied to the velocity modulation circuit in case that current broadcasting signal is not received. Therefore, noise radiation can be prevented. CONSTITUTION: The device for cutting off power of a velocity modulation circuit includes a tuner(10), a micom(20) and a cutting part(30). The tuner(10) tunes broadcasting signal received through an antenna. The micom(20) senses whether TV broadcasting signal is received according to CVBS(composite video, baseband signal) and horizontal synchronizing signal applied from the tuner(10). If the TV broadcasting signal is not received, the micom(20) outputs mute controlling signal of the velocity modulation circuit(40). When the mute controlling signal of the velocity modulation circuit(40) is applied from the micom(20), the cutting part(30) stop operation of the velocity modulation circuit(40) by cutting off power applied to the velocity modulation circuit(40).

Description

속도변조회로의 전원 차단장치{A power cut off apparatus of the velocity modulation circuit}A power cut off apparatus of the velocity modulation circuit

본 발명은 속도변조회로를 채용한 TV에 관한 것으로, 보다 상세하게는 TV 방송신호의 미수신시 속도변조회로로 인가되는 전원을 차단하여 속도변조회로의 동작에 따른 방사현상을 제거할 수 있도록 한 속도변조회로의 전원 차단장치에 관한 것이다.The present invention relates to a TV employing a speed modulator circuit, and more particularly, a speed to remove a radiation phenomenon due to the operation of the speed modulator circuit by cutting off the power applied to the speed modulator circuit when the TV broadcast signal is not received. The present invention relates to a power interruption device for a modulation circuit.

일반적으로 25인치 이상의 대형 TV는 화질을 높이기 위해 속도변조(Velocity Modulation)회로를 사용하여 화면의 섬세도를 증가시킨다. 속도변조회로는 휘도신호의 변화가 일어나는 부분에서 그 변화하는 양에 비례하여 화면상의 수평주사 속도를 변조시켜 편향 부분을 보정하여 영상신호의 섬세도를 향상시킨다.In general, large TVs larger than 25 inches use a Velocity Modulation circuit to increase the picture quality. The speed modulation circuit modulates the horizontal scanning speed on the screen in proportion to the change amount in the portion where the luminance signal changes, thereby correcting the deflection portion, thereby improving the fineness of the image signal.

이러한 속도변조회로의 동작을 도 1을 통해 간략하게 설명하면, 먼저 휘도신호의 입력시(단계100), 입력되는 휘도신호에 대해서 1차 미분을 수행한다(단계200) 여기서, 휘도신호는 그 크기가 작으므로 1차 미분된 신호를 약 10~15배 정도 증폭을 시킨다(단계300). 증폭시 1차 미분된 신호에 포함되어 있는 노이즈도 같이 증폭이 되므로 이 노이즈를 제거한(단계400) 후 다시 2차 미분시킴과 동시에 증폭하여(단계500) 편향코일로 전류를 공급한다. 2차 미분된 휘도신호의 전압파형이 속도변조를 하기 위한 편향코일(Deflection Coil)로 인가되면 편향코일에 전류가 흐르게 된다(단계600). 이렇게 편향코일에 흐르는 전류의 세기에 비례하는 강도로 편향부분을 강하게 또는 약하게 조절하여 화면상의 수평주사 속도를 변조시키게 된다.The operation of the speed modulation circuit will be briefly described with reference to FIG. 1. First, when the luminance signal is input (step 100), the first derivative is performed on the input luminance signal (step 200). Since the first differential signal is amplified by about 10 to 15 times (step 300). Since the noise included in the first differential signal is also amplified during the amplification, the noise is removed (step 400), and the second differential is simultaneously amplified (step 500) to supply current to the deflection coil. When the voltage waveform of the second differential luminance signal is applied to a deflection coil for speed modulation, current flows in the deflection coil (step 600). Thus, the horizontal scanning speed on the screen is modulated by adjusting the deflection portion strongly or weakly with an intensity proportional to the strength of the current flowing through the deflection coil.

그러나, 위와 같은 속도변조회로를 채용한 프로젝션(Projection) TV의 특정모델에서는 TV 방송신호의 수신여부에 관계없이 항상 속도변조회로가 동작하게 된다. 이로 인하여, 속도변조회로의 구동으로 발생하는 기기 또는 부품의 무선주파 에너지 방사(Radiation)에 의해 다른 기기와 부품에 방해를 주는 EMI(Electro-Magnetic Interference;전자파 간섭)현상이 생기게 된다. 이로 인하여 FCC(Federal Communication Commission;미국연방통신위원회)의 안전 규격 사항에 위배되는 문제점을 가진다.However, in the specific model of the projection TV employing the speed modulation circuit as described above, the speed modulation circuit always operates regardless of whether or not the TV broadcast signal is received. As a result, EMI (Electro-Magnetic Interference) phenomenon, which interferes with other devices and components by radio frequency energy radiation of devices or components generated by driving the speed modulation circuit, is generated. This has a problem that violates the safety standards of the Federal Communications Commission (FCC).

따라서, 본 발명의 목적은 전술한 문제점을 해결할 수 있도록 현재 방송신호가 수신되지 않을 경우에는 속도변조회로로 공급되는 전원을 차단하여 노이즈 방사를 방지하도록 하는 속도변조회로의 전원 차단장치를 제공함에 있다.Accordingly, an object of the present invention is to provide a power interruption device of a speed modulation circuit to prevent noise radiation by cutting off the power supplied to the speed modulation circuit when a broadcast signal is not received. .

도 1은 일반적인 속도변조회로의 동작을 설명하기 위한 흐름도,1 is a flow chart for explaining the operation of the general speed modulation circuit;

도 2는 본 발명에 따른 속도변조회로의 전원 차단장치를 나타내는 구성도.Figure 2 is a block diagram showing a power cut-off device of the speed modulation circuit according to the present invention.

<도면의 주요부분에 대한 부호의 설명＞<Description of the code | symbol about the principal part of drawing>

10 : 튜너 20 : 마이컴10: tuner 20: micom

30 : 차단부 40 : 속도변조회로30: breaker 40: speed modulation circuit

이와 같은 목적을 달성하기 위한 본 발명의 속도변조회로의 전원 차단장치는, TV 방송신호 수평방향의 선명도를 높이기 위한 속도변조회로에 있어서, 수신되는 방송신호를 선국하는 튜너와, 튜너로부터 방송신호의 수신여부를 감지하여 방송신호의 미수신시 속도변조회로의 뮤트 제어신호를 출력하는 마이컴 및 마이컴으로부터 속도변조회로의 뮤트 제어신호의 인가시 속도변조회로로 인가되는 전원을 차단시키는 차단부를 포함한다.In order to achieve the above object, a power interruption device of a speed modulation circuit of the present invention is a speed modulation circuit for improving the clarity in a horizontal direction of a TV broadcast signal, comprising: a tuner for tuning a received broadcast signal; And a cut-off unit for detecting whether the broadcast signal is received and outputting the mute control signal of the speed modulator circuit when the broadcast signal is not received and cutting off the power applied to the speed modulator circuit when the mute control signal of the speed modulator circuit is applied from the micom.

이하, 첨부한 도면을 참조하여 본 발명의 바람직한 실시예를 상세히 기술하기로 한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명에 따른 속도변조회로의 전원 차단장치의 구성도를 나타낸다. 도 2에 보여지는 장치는, 안테나를 통해 수신되는 방송신호를 선국하는 튜너(10)와, 튜너(10)로부터 인가되는 CVBS(Composite Video, Baseband Signal)신호 및 수평동기 신호에 따라 TV 방송신호의 수신여부를 감지하여 TV 방송신호가 전송되지 않을 경우 속도변조회로(40)의 뮤트 제어신호를 출력하는 마이컴(20) 및 마이컴(20)으로부터 속도변조회로(40)의 뮤트 제어신호의 인가시 속도변조회로(40)로 인가되는 전원을 차단시킴으로써 속도변조회로(40)의 구동을 정지시키는 차단부(30)로 이루어진다.2 is a block diagram of a power cut-off device of a speed modulation circuit according to the present invention. The apparatus shown in FIG. 2 includes a tuner 10 that tunes a broadcast signal received through an antenna, a TVBS signal according to a composite video (baseband signal) signal and a horizontal synchronization signal applied from the tuner 10. The speed when the mute control signal of the speed modulator circuit 40 is applied from the microcomputer 20 and the microcomputer 20 that outputs the mute control signal of the speed modulator circuit 40 when the TV broadcast signal is not transmitted by detecting the reception. It is composed of a blocking unit 30 for stopping the driving of the speed modulation circuit 40 by cutting off the power applied to the modulation circuit (40).

이와같이 구성된 본 발명에 따른 속도변조회로의 전원 차단장치에 대한 동작을 구체적으로 설명하면 다음과 같다.The operation of the power interruption device of the speed modulator circuit according to the present invention configured as described above will be described in detail.

먼저, 튜너(10)는 안테나를 통해 수신되는 방송신호를 선국하게 된다. 마이컴(20)은 튜너(10)로부터 인가되는 CVBS(Composite Video, Baseband Signal)신호 및 수평동기 신호의 검출 여부를 감지하여 TV 방송신호의 수신여부를 판단하게 된다. 즉, 상술된 CVBS신호 및 수평동기 신호가 감지될 경우 TV 방송신호가 수신되었다고 판단하고, 감지되지 않을 경우에는 TV 방송신호가 미수신되었다고 판단한다. 마이컴(20)은 방송신호의 수신시에는 속도변조회로(40)를 통상적으로 동작시키는 제어신호를 출력하고, 방송신호의 미수신시에는 속도변조회로(40)의 동작을 뮤트(Mute)시키는 제어신호를 출력하게 된다. 차단부(30)는 마이컴(20)으로부터 속도변조회로(40)의 뮤트 제어신호의 인가시 속도변조회로(40)로 인가되는 전원을 차단시킴으로써 속도변조회로(40)의 동작을 정지시킨다.First, the tuner 10 tunes a broadcast signal received through an antenna. The microcomputer 20 determines whether the TV broadcast signal is received by detecting whether the CVBS (Composite Video, Baseband Signal) signal and the horizontal synchronization signal applied from the tuner 10 are detected. That is, when the above-described CVBS signal and the horizontal synchronization signal are detected, it is determined that the TV broadcast signal has been received, and when not detected, it is determined that the TV broadcast signal has not been received. The microcomputer 20 outputs a control signal that normally operates the speed modulator circuit 40 when receiving the broadcast signal, and mutes the operation of the speed modulator circuit 40 when the broadcast signal is not received. Will print The interrupter 30 stops the operation of the speed modulator circuit 40 by cutting off the power applied to the speed modulator circuit 40 when the mute control signal of the speed modulator circuit 40 is applied from the microcomputer 20.

상술한 바와 같이, 본 발명에 따른 속도변조회로의 전원 차단장치는, 방송신호가 수신되지 않을 경우에는 속도변조회로로 인가되는 전원을 차단시킴으로써 속도변조회로의 구동시 발생하는 노이즈의 방사현상을 제거할 수 있게 되는 효과를 가진다.As described above, the power interruption device of the speed modulator circuit according to the present invention eliminates the radiation phenomenon of noise generated when the speed modulator circuit is driven by cutting off the power applied to the speed modulator circuit when a broadcast signal is not received. It has the effect of being able to.

Claims (2)

TV 방송신호의 수평방향의 선명도를 높이기 위한 속도변조회로를 구비한 방송신호수신기에 있어서,In a broadcast signal receiver having a speed modulating circuit for increasing the horizontal sharpness of a TV broadcast signal, 수신되는 상기 방송신호를 선국하는 튜너;A tuner for tuning the received broadcast signal; 상기 튜너로부터 방송신호의 수신여부를 감지하여 방송신호의 미수신시 상기 속도변조회로의 뮤트 제어신호를 출력하는 마이컴; 및A microcomputer that detects whether a broadcast signal is received from the tuner and outputs a mute control signal of the speed modulator when the broadcast signal is not received; And 상기 마이컴으로부터 속도변조회로의 뮤트 제어신호의 인가시 상기 속도변조회로로 인가되는 전원을 차단시키는 차단부를 포함하는 속도변조회로의 전원 차단장치.And a cut-off unit which cuts off the power applied to the speed modulating circuit when the mute control signal of the speed modulating circuit is applied from the micom. 제 1항에 있어서, 상기 마이컴은 상기 튜너로부터 CVBS신호 또는 수평동기 신호의 입력유무에 따라 방송신호 수신여부를 판단함을 특징으로 하는 속도변조회로의 전원 차단장치.[2] The apparatus of claim 1, wherein the microcomputer determines whether a broadcast signal is received based on whether a CVBS signal or a horizontal synchronization signal is input from the tuner.
KR1019990035117A 1999-08-24 1999-08-24 A power cut off apparatus of the velocity modulation circuit KR20010018952A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960009493U (en) * 1994-08-25 1996-03-16 Speed Modulation (VM) Mute Circuit
KR980005879U (en) * 1996-06-29 1998-03-30 TV receiver power off during voice mute
JPH11127365A (en) * 1990-08-02 1999-05-11 Thomson Consumer Electron Inc Television display device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11127365A (en) * 1990-08-02 1999-05-11 Thomson Consumer Electron Inc Television display device
KR960009493U (en) * 1994-08-25 1996-03-16 Speed Modulation (VM) Mute Circuit
KR980005879U (en) * 1996-06-29 1998-03-30 TV receiver power off during voice mute

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