KR0127163Y1 - Tv/vcr mode selection apparatus - Google Patents
Tv/vcr mode selection apparatus Download PDFInfo
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- KR0127163Y1 KR0127163Y1 KR2019920016266U KR920016266U KR0127163Y1 KR 0127163 Y1 KR0127163 Y1 KR 0127163Y1 KR 2019920016266 U KR2019920016266 U KR 2019920016266U KR 920016266 U KR920016266 U KR 920016266U KR 0127163 Y1 KR0127163 Y1 KR 0127163Y1
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
- H04N5/213—Circuitry for suppressing or minimising impulsive noise
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/12—Passive devices, e.g. 2 terminal devices
- H01L2924/1203—Rectifying Diode
- H01L2924/12035—Zener diode
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
본 고안은 TV/VCR모드 선택장치에 관한 것으로, 전환스위치에 의해 스위치전압(Bs)이 오프(0V)인 TV모드에서 스위치전압(Bs)이 온(12V)인 VCR모드로 전환시, 과파응답 노이즈가 TV세트로 흘러 음성 및 영상이 저하되는 문제점을 해결하기 위한 것이다.The present invention relates to a TV / VCR mode selection device, and over-response when switching from the TV mode in which the switch voltage Bs is off (0 V) to the VCR mode in which the switch voltage Bs is on (12 V) by a changeover switch. This is to solve the problem that noise flows to the TV set and the voice and video are degraded.
본 고안은 이와같은 종래 문제점을 해결하기 위하여 TV모드선택시 스위치전압(Bs)이 오프(0V)된 상태에서도 RF변조부가 저전압으로 동작상태를 유지시켜 전환스위치에 의해 스위치전압(Bs)이 온(12V)인 VCR모드로 선택시 발생하는 과파응답 노이즈 발생을 방지하도록한 것으로 RF변조기에 적용한다.In order to solve this problem, the RF modulator maintains the operating state at a low voltage even when the switch voltage Bs is turned off (0 V) when the TV mode is selected. It is applied to the RF modulator to prevent the occurrence of over response noise generated when the VCR mode is selected as 12V).
Description
제1도는 종래 TV/VCR모드 선택장치의 회로도.1 is a circuit diagram of a conventional TV / VCR mode selection device.
제2도는 본 고안 TV/VCR모드 선택장치의 회로도.2 is a circuit diagram of a TV / VCR mode selection device of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
11 : RF변조부 12 : 안테나 스위치부11: RF modulator 12: antenna switch unit
Bs1 : 스위치전압 Bo : 등가전압Bs1: Switch voltage Bo: Equivalent voltage
본 고안은 텔레비젼/비디오 카세트 레코더(TV/VCR)모드 선택장치에 관한 것으로, 특히 TV/VCR 모드에 따른 입력 비디오 신호를 선택시, 발생하는 과파응답 노이즈를 차단하는데 적당한 것이다.The present invention relates to a television / video cassette recorder (TV / VCR) mode selection apparatus, and is particularly suitable for blocking the over response noise generated when selecting an input video signal according to the TV / VCR mode.
종래 TV/VCR모드에 따른 입력비디오 신호를 선택하는 TV/VCR모드 선택장치는 제1도에 도시된 바와같이 VCR의 영상입력신호와 음성입력신호를 재생 TV신호로 출력시키는 RF변조부(1)와, 변조된 재생 TV신호와 외부입력 TV신호를 선택하는 안테나 스위치부(2)로 구성된 것으로 미설명부호 Q1, Q2는 트랜지스터, R1 내지 R5는 저항, ZD1은 제너다이오드이다.TV / VCR mode selection apparatus for selecting the input video signal according to the conventional TV / VCR mode is an RF modulator (1) for outputting the video input signal and audio input signal of the VCR as a reproduction TV signal as shown in FIG. And an antenna switch unit 2 for selecting a modulated reproduced TV signal and an external input TV signal, wherein reference numerals Q1 and Q2 are transistors, R1 to R5 are resistors, and ZD1 is a zener diode.
이와같이 구성된 종래 TV/VCR모드 선택장치는 제1도에 도시된 바와같이 TV모드와 VCR모드로 전환시키는 전환스위치에 의해 TV모드로 선택시, 스위치전압(Bs)이 오프(0V)가 되면 안테나 스위치부(2)의 트랜지스터(Q1)(Q2)가 오프되어 외부 안테나로부터 입력된 외부입력 TV신호가 RF출력단을 통해 출력된다.The conventional TV / VCR mode selection device configured as described above has an antenna switch when the switch voltage Bs is turned off (0V) when the TV mode is selected by a switching switch to switch between the TV mode and the VCR mode as shown in FIG. The transistors Q1 and Q2 of the unit 2 are turned off so that an external input TV signal input from an external antenna is output through the RF output terminal.
즉, 스위치전압(Bs)이 오프(0V)되므로서, 영상입력신호와 음성입력신호를 TV재생신호로 변조 출력시키는 RF변조부(1)의 동작을 차단시키는 것이다.That is, since the switch voltage Bs is turned off (0 V), the operation of the RF modulator 1 for modulating and outputting the video input signal and the audio input signal to the TV reproduction signal is interrupted.
한편, 전환스위치에 의해 VCR모드로 선택시, 스위치전압(Bs)이 온(12V)되면 저항(R5)을 통해 제너다이오드(ZD1)에 설정된 안정화 전압(Bc)에 의하여 RF변조부(1)가 동작하고, 안테나 스위치부(2)의 트랜지스터(Q1)(Q2)를 온시켜 외부 안테나로부터 입력되는 외부입력 TV신호가 차단되면서 상기 RF변조부(1)에서 출력되는 재생 TV신호가 RF출력단을 통해 출력되는 것이다.On the other hand, when the switch voltage Bs is turned on (12V) by the selector switch, the RF modulator 1 is driven by the stabilization voltage Bc set in the zener diode ZD1 through the resistor R5. In operation, the transistors Q1 and Q2 of the antenna switch unit 2 are turned on so that an external input TV signal input from an external antenna is cut off, and a reproduction TV signal output from the RF modulator 1 is transmitted through an RF output terminal. Is the output.
그러나 종래 TV/VCR모드 선택장치는 전환스위치에 의하여 스위치전압(Bs)이 오프(0V)인 TV모드에서 스위치전압(Bs)이 온(12V)인 VCR모드로 전환시, 과파응답 노이즈가 TV세트로 흘러 음성 및 영상이 저하되는 문제점이 있었다.However, in the conventional TV / VCR mode selection device, when the switch voltage Bs is turned off (0 V) from the TV mode to the VCR mode in which the switch voltage Bs is turned on (12 V), the transient response noise is set to the TV set. There was a problem that the audio and video is deteriorated.
본 고안은 이와같은 종래 문제점을 해결하기 위하여 TV모드선택시 스위치전압(Bs)이 오프(0V)된 상태에서도 RF변조부가 저전압으로 동작상태를 유지시켜 전환스위치에 의해 스위치전압(Bs)이 온(12V)인 VCR모드로 선택시 발생하는 과파응답 노이즈 발생을 방지하는데 그 목적이 있는 것으로 첨부된 도면에 의하여 본 고안의 구성 및 작용효과를 설명하면 다음과 같다.In order to solve this problem, the RF modulator maintains the operating state at a low voltage even when the switch voltage Bs is turned off (0 V) when the TV mode is selected. 12V) VCR mode that is selected for the purpose of preventing the occurrence of over-response noise generated by the accompanying drawings will be described as follows.
먼저, 본 고안 TV/VCR모드에 따른 입력 비디오를 선택하는 TV/VCR모드 선택장치는 제2도에 도시된 바와같이, VCR이 영상입력신호와 음성입력신호를 재생 TV신호로 출력시키는 RF변조부(11)와, 변조된 재생 TV신호와 외부입력 TV신호를 선택하는 안테나 스위치부(12)와, 과파응답 노이즈를 제거하기 위해 전원스위칭 동작을 수행하는 스위치 다이오드(D1) 및 저항(R10)(R11)으로 구성된 것으로 미설명부호 Q3, Q4는 트랜지스터, R6 내지 R9는 저항, ZD2는 제너다이오드이다.First, the TV / VCR mode selection apparatus for selecting the input video according to the TV / VCR mode of the present invention, as shown in Figure 2, the RF modulator for outputting the video input signal and the audio input signal as a reproduction TV signal by the VCR (11), an antenna switch unit 12 for selecting a modulated reproduced TV signal and an external input TV signal, a switch diode D1 and a resistor R10 for performing a power switching operation to remove the transient response noise ( R11), reference numerals Q3 and Q4 denote transistors, R6 to R9 denote resistors, and ZD2 denotes zener diodes.
이와같이 구성된 본 고안의 작용효과는 제2도에 도시된 바와같이 TV모드와 VCR모드를 전환시키는 전환스위치에 의해 TV모드로 전환시 스위치전압(Bs1)이 오프(0V)되면 RF변조부(11)를 동작시키는 동작전압이 제너다이오드(ZD2)와 저항(R10)에 의해 설정된 안정화 전압(Bc1)이 온(6.2V)되어 VCR세트에 별도로 등가전압(Bo)이 인가되므로서 상기 스위치전압(Bs1)을 스위칭하는 스위치 다이오드(D1)에 역전압(Bo0)이 걸려 오프된다.The operation and effect of the present invention configured as described above is the RF modulator 11 when the switch voltage (Bs1) is turned off (0V) when switching to the TV mode by the switch for switching the TV mode and the VCR mode as shown in FIG. The operating voltage for operating the voltage is set by the zener diode ZD2 and the resistor R10, and the stabilization voltage Bc1 is turned on (6.2 V) so that an equivalent voltage Bo is applied to the VCR set separately so that the switch voltage Bs1 is applied. The reverse voltage Bo0 is applied to the switch diode D1 for switching the off.
즉, VCR세트에 별도로 공급된 등가전압(Bo)은 저항(R11)을 통해 전류값(Io)을 RF변조부(11)에 전달한다.That is, the equivalent voltage Bo separately supplied to the VCR set transmits the current value Io to the RF modulator 11 through the resistor R11.
이때 Bc1o=Bo-IoR11이다.(Bc1o는 발전개시전압, R11은 저항)At this time, Bc1o = Bo-IoR11 (Bc1o is the power generation starting voltage and R11 is the resistance).
발진개시전압(Bc1o)이 RF변조부(11)의 캐리어 발진회로의 발진개시전압(Bc1o≤2.4V)으로 있으면, 상기 RF변조부(11)는 동작하지만 외부안테나에서 입력되는 외부입력 TV신호에는 영향을 주지않는다.When the oscillation start voltage Bc1o is the oscillation start voltage Bc1o ≦ 2.4V of the carrier oscillation circuit of the RF modulator 11, the RF modulator 11 operates but is not connected to an external input TV signal input from an external antenna. Does not affect
이와 반대로, 전환스위치에 의해 VCR모드로 전환시 스위치전압(Bs1)이 온(12V)되면, RF변조부(11)를 동작시키는 동작전압이 저항(R10)과 제너다이오드(ZD2)에 의해 설정된 안정화전압(Bc1)이 온(6.2V)되어 VCR세트에 별도로 등가전압(Bo)을 공급하므로서, 상기 스위치전압(Bs1)을 스위칭하는 스위치 다이오드(D1)에 정전압(Bo0)이 걸려 온된다.On the contrary, when the switch voltage Bs1 is turned on (12V) when the VCR mode is switched to the VCR mode, the operating voltage for operating the RF modulator 11 is stabilized by the resistor R10 and the zener diode ZD2. Since the voltage Bc1 is turned on (6.2V) to supply the equivalent voltage Bo to the VCR set separately, the constant voltage Bo0 is applied to the switch diode D1 for switching the switch voltage Bs1.
이때 RF변조부(11)가 저전압으로 동작상태를 유지하면서 출력된 TV재생신호와 외부입력 TV신호를 선택하는 안테나 스위치부(12)의 트랜지스터(Q3)(Q4)가 온되어 상기 외부입력 TV신호를 차단하므로서 TV재생신호가 RF출력단을 통해 출력되는 것이다.At this time, the transistors Q3 and Q4 of the antenna switch unit 12 for selecting the output TV playback signal and the external input TV signal while the RF modulator 11 maintains the operating state at a low voltage are turned on, and the external input TV signal is turned on. By blocking the TV playback signal is output through the RF output stage.
이상에서 설명한 바와같이 전환스위치에 의해 TV모드를 선택시 스위치 전압이 온된 상태에서 RF변조부가 저전압으로 동작상태를 유지하므로서 상기 전환스위치에 의해 VCR모드를 TV모드로 전환시, 과파응답 노이즈가 발생하지 않으므로 선명한 TV음성 및 영상을 얻을 수 있는 효과가 있다.As described above, when the switch voltage is turned on when the TV mode is selected by the changeover switch, the RF modulator maintains the operation state at a low voltage, and thus, when the VCR mode is switched to the TV mode by the changeover switch, no transient response noise occurs. Therefore, there is an effect that can obtain a clear TV sound and video.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019920016266U KR0127163Y1 (en) | 1992-08-28 | 1992-08-28 | Tv/vcr mode selection apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| KR2019920016266U KR0127163Y1 (en) | 1992-08-28 | 1992-08-28 | Tv/vcr mode selection apparatus |
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| Publication Number | Publication Date |
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| KR940006679U KR940006679U (en) | 1994-03-25 |
| KR0127163Y1 true KR0127163Y1 (en) | 1998-12-15 |
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| KR2019920016266U KR0127163Y1 (en) | 1992-08-28 | 1992-08-28 | Tv/vcr mode selection apparatus |
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