KR910008270Y1 - Ntsc/pal double use serbo standard frequency oscilliation circuit - Google Patents
Ntsc/pal double use serbo standard frequency oscilliation circuit Download PDFInfo
- Publication number
- KR910008270Y1 KR910008270Y1 KR2019860003614U KR860003614U KR910008270Y1 KR 910008270 Y1 KR910008270 Y1 KR 910008270Y1 KR 2019860003614 U KR2019860003614 U KR 2019860003614U KR 860003614 U KR860003614 U KR 860003614U KR 910008270 Y1 KR910008270 Y1 KR 910008270Y1
- Authority
- KR
- South Korea
- Prior art keywords
- ntsc
- terminal
- pal
- microprocessor
- oscillator
- Prior art date
Links
Classifications
-
- 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
- H04N11/00—Colour television systems
- H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
- H04N11/12—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only
- H04N11/14—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system
- H04N11/16—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system the chrominance signal alternating in phase, e.g. PAL-system
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2231/00—Applications
- H01H2231/036—Radio; TV
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Color Television Systems (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
내용 없음.No content.
Description
제1도는 본 고안의 회로도이다.1 is a circuit diagram of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 마이크로프로세서 2 : PAL방식발진기1: Microprocessor 2: PAL Oscillator
3 : NTSC방식발진기 4 : 드럼서보IC3: NTSC Oscillator 4: Drum Servo IC
TR1 : 트랜지스터 VR1, VR2 : 가변저항TR1: Transistor VR1, VR2: Variable resistor
S/W : 동작절환스위치S / W: Operation Switch
[산업상의 이용분야][Industrial use]
본 고안은 NTSC/PAL겸용 발진회로에 관한 것으로, 특히 NTSC/PAL겸용 서보 기준주파수를 발진함으로써 NTSC 방식과 PAL 방식에 모두 사용할 수 있도록 서보 기준주파수발진회로에 관한 것이다.The present invention relates to an NTSC / PAL combined oscillation circuit, and more particularly, to a servo reference frequency oscillator circuit to be used in both NTSC and PAL by oscillating the NTSC / PAL combined servo reference frequency.
[종래의 기술 및 그 문제점][Traditional Technology and Problems]
일반적으로 텔레비젼의 방송방식에는 NTSC(National Television System Committee) 방식과 PAL(Phase Alteration by Line) 방식 및 SECAM(Sequence de Couleurs Avec Memoire) 방식으로 나누어지고 있는 바, 이중 NTSC 방식은 종래의 흑백텔레비젼과 동일한 채널에 색신호를 포함시켜 전송하게 되어 있으므로 흑백수상기로 이 전파를 받으면 그대로 흑백화면으로 시청할 수 있음은 물론 흑백텔레비젼전파를 컬러수상기로 수신하여도 보통의 흑백화면으로 볼 수 있도록 된 양립방식으로 된 것인 반면, PAL 방식은 NTSC 방식과 동일한 위도신호를 사용하지만 주사선 1개마다 색신호의 한쪽을 위상반전시켜 전송하고, 수신측에서도 이 한쪽을 다시 반전시켜 수신하게 되는 방식으로서 NTSC 방식보다 S/N비가 좋고 위상왜곡을 받지 않은 방식이며, SECAM 방식은 주사선 1개전의 색신호를 기억하여 다음 라인의 신호와 동시에 이용하는 방식이다.Generally, the television broadcasting system is divided into NTSC (National Television System Committee), PAL (Phase Alteration by Line), and SECAM (Sequence de Couleurs Avec Memoire). The NTSC system is the same as the conventional black and white television. Since a color signal is transmitted to a channel, it can be viewed as a black and white screen as it is received by a black and white receiver, as well as a compatible system that can be viewed as a normal black and white screen even when a black and white television radio is received by a color receiver. On the other hand, the PAL method uses the same latitude signal as that of the NTSC method, but transmits one phase of the color signal for each scanning line by inverting the phase, and the receiving side inverts the other side to receive the S / N ratio better than the NTSC method. It is a method that is not subject to phase distortion, and the SECAM method stores the color signal of one scan line before It is used simultaneously with the signal of the line.
현재의 영상신호기록재생장치에는 상술한 NTSC 방식과 PAL 방식으로 각기 분리된 마이크로프로세서가 내장되어 있는 바, 즉 NTSC 방식인 경우에는 드럼서보용 기준주파수를 60Hz로, PAL 방식인 경우에는 50Hz로 발진시키기 위해서 동일 규격의 마이크로프로세서를 2개 사용하였으므로 가격 상승과 고장발생률이 증대된다는 단점이 있었다.The current video signal recording and reproducing apparatus has a microprocessor which is separated into the above-described NTSC method and PAL method. That is, the NTSC method oscillates at a reference frequency of 60 Hz for the drum servo and 50 Hz for the PAL method. In order to make use of two microprocessors of the same standard, there was a disadvantage that the price increase and the failure rate increased.
[고안의 목적][Purpose of designation]
본 고안은 상기한 점을 감안하여 고안된 것으로, NTSC 방식과 PAL 방식의 기준주파수발진회로를 트랜지스터와 가변저항 등으로 사용하여 1개의 마이크로프로세서로 공용발진시킬 수 있게 함으로써 원가절감과 발진부의 크기 축소 및 고장률의 저하를 도모할 수 있는 NTSC/PAL 겸용 서보 기준주파수발진회로를 제공함에 그 목적이 있다.The present invention has been devised in view of the above-mentioned point, and the NTSC and PAL reference frequency oscillator circuits can be used as a transistor and a variable resistor for common oscillation using one microprocessor, thereby reducing cost and reducing the size of the oscillator. The purpose is to provide a servo reference frequency oscillator for NTSC / PAL that can reduce the failure rate.
[고안의 구성 및 작용][Configuration and Action of Design]
상기 목적을 달성하기 위한 본 고안은 마이크로프로세서(1)의 단자(③)에 콘덴서(C1)가 연결되고, 이 콘덴서(C1)에는 콘덴서(C2)가 연결된 PAL 방식발진기(2)와 콘덴서(C3)가 연결된 NTSC 방식발진기(3)가 병렬로 연결되며, 상기 마이크로프로세서(1)의 단자(⑤)에는 드럼서보 IC(4)의 단자(⑪)가 연결되고, 마이크로프로세서(1)의 단자(⑥)에는 트랜지스터(TR1)의 콜렉터단자와 PAL 방식발진기(2)가 연결되며, 마이크로프로세서(1)의 단자(⑦)에는 트랜지스터(TR1)의 에미터단자가 연결되고, 트랜지스터(TR1)의 베이스단자에는 다이오드(D1)와 저항(R2) 및 NTSC 방식발진기(3)가 연결되며, 트랜지스터(TR1)의 에미터와 베이스 사이에는 저항(R1)과 동작절환스위치(S/W)가 각각 병렬로 연결되고, 트랜지스터(TR1)의 베이스와 콜렉터 사이에는 다이오드(D2)가 연결된 가변저항(VR1)과 다이오드(D3)가 연결된 가변저항(VR2)이 각각 병렬로 연결됨과 더불어 저항(R5)을 매개해서 드럼서보IC(4)의 단자(⑬)에 연결된 구성으로 되어, 1개의 마이크로프로세서에 의해 NTSC/PAL 겸용 서보 기준주파수를 발진시킬 수 있도록 되어 있다.The present invention for achieving the above object is a capacitor (C1) is connected to the terminal (③) of the microprocessor (1), the capacitor (C1) PAL oscillator (2) and the capacitor (C3) connected to the capacitor (C2) NTSC oscillator (3) connected in parallel is connected in parallel, and the terminal (⑪) of the drum servo IC (4) is connected to the terminal (⑤) of the microprocessor (1), and the terminal ( ⑥), the collector terminal of transistor TR1 and the PAL oscillator 2 are connected, and the emitter terminal of transistor TR1 is connected to the terminal ⑦ of microprocessor 1, and the base of transistor TR1 is connected. A diode D1, a resistor R2, and an NTSC oscillator 3 are connected to a terminal, and a resistor R1 and an operation switching switch S / W are connected in parallel between the emitter and the base of the transistor TR1, respectively. A variable resistor VR1 connected between the base and the collector of the transistor TR1 and having a diode D2 connected thereto. The variable resistor VR2 to which the diode D3 is connected is connected in parallel, and is connected to the terminal of the drum servo IC 4 via a resistor R5. It is possible to oscillate the PAL dual-servo reference frequency.
[실시예]EXAMPLE
이하, 예시도면을 참조하여 본 발명의 실시예에 대해 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
제1도에서 먼저 텔레비젼이 PAL 방식인 경우, 동작절환스위치(S/W)를 오프상태로 하면 동작전원(Vcc)이 트랜지스터(TR1)의 에미터단자에 인가되게 되므로 트랜지스터(TR1)는 턴온되게 된다. 따라서, 동작전압(Vcc)은 트랜지스터(TR1)의 콜렉터단자를 통해서 마이크로프로세서(1)의 단자(⑥)에 하이신호로서 입려됨과 더불어 PAL 방식발진기(2)에 입력되게 된다. 이때 따라 PAL 방식발진기(2)에서 발진된 4.43MHz의 주파수는 마이크로프로세서(1)의 단자(③)로 입력되게 된다. 다음, 마이크로프로세서(1)는 단자(③)로 입력된 PAL 방식주파수와, 단자(⑥)로 입력된 동작전압을 감지하여 1/88672배로 분주를 시키게 된다. 즉 1/88672×4.43×106≒50(Hz)로 분주되고, 이 분주된 50Hz의 주파수는 마이크로프로세서(1)의 단자(⑤)를 통해 드럼서보IC(4)의 단자(⑪)로 입력되게 된다.In FIG. 1, when the television is in the PAL system first, when the operation switching switch S / W is turned off, the operating power supply Vcc is applied to the emitter terminal of the transistor TR1, so that the transistor TR1 is turned on. do. Therefore, the operating voltage Vcc is applied as a high signal to the terminal 6 of the microprocessor 1 through the collector terminal of the transistor TR1 and is input to the PAL oscillator 2. At this time, the frequency of 4.43 MHz oscillated by the PAL oscillator 2 is input to the terminal ③ of the microprocessor 1. Next, the microprocessor 1 detects the PAL system frequency input to the terminal (③) and the operating voltage input to the terminal (⑥) and divides the signal by 1/88672 times. That is, it is divided into 1/88672 × 4.43 × 10 6 ≒ 50 (Hz), and the divided frequency of 50Hz is inputted to the terminal of the drum servo IC 4 through the terminal ⑤ of the microprocessor 1. Will be.
따라서, 드럼서보IC(4)에 내장되어 있는 버퍼발진기(도시되지 않음)는 가변저항(VR2)과 저항(R5) 및 콘덴서(C4)의 조정에 의해서 PAL 방식의 주파수로 발진될 수 있게 해 주므로 영상신호기록재생장치는 PAL 방식으로 동작되게 된다.Therefore, the buffer oscillator (not shown) built in the drum servo IC 4 can be oscillated at a PAL frequency by adjusting the variable resistor VR2, the resistor R5, and the capacitor C4. The video signal recording and reproducing apparatus is operated in a PAL method.
한편, 영상신호기록재생장치를 NTSC 방식으로 동작시키고자 할 경우, 상기 동작절환스위치(S/W)를 온상태로 하면, 상기 동작전압이 NTSC 방식 발진기(3)에 직접 입력되게 되므로 트랜지스터(TR1)의 에미터전자전압이 베이스단자전압보다 낮게 되어 트랜지스터(TR1)는 턴오프되게 된다.On the other hand, when the video signal recording and reproducing apparatus is operated in the NTSC system, when the operation switching switch S / W is turned on, the operating voltage is directly input to the NTSC oscillator 3, so that the transistor TR1 is used. The emitter electron voltage of?) Is lower than the base terminal voltage, so that the transistor TR1 is turned off.
따라서, 트랜지스터(TR1)의 콜렉터단자를 통해 흐르는 신호가 없으므로 마이크로프로세서(1)의 단자(⑥)에는 로우신호가 입력되게 되고, NTSC 방식발진기(3)에서 발진된 3.58MHz의 주파수는 콘덴서(C3)와 콘덴서(C1)를 매개하여 마이크로프로세서(1)의 단자(③)에 입력되게 된다.Therefore, since there is no signal flowing through the collector terminal of the transistor TR1, a low signal is input to the terminal 6 of the microprocessor 1, and the frequency of 3.58 MHz oscillated by the NTSC oscillator 3 is the capacitor C3. ) And the condenser C1 are inputted to the terminal ③ of the microprocessor 1.
다음, 마이크로프로세서(1)는 단자(③)의 신호와 단자(⑥)의 신호를 감지하여 1/59712배로 분주를 하게 된다. 즉 1/59712×3.58×106=60(Hz)로 분주되고, 이 60Hz로 분주된 주파수는 마이크로프로세서(1)의 단자(⑤)를 통해 드럼서보IC(4)의 단자(⑪)로 입력되게 된다. 따라서, 드럼서보IC(4)에 내장되어 있는 버퍼발진기를 가변저항(VR1)과 저항(R5) 및 콘덴서(C4)의 조정에 의해서 NTSC 방식의 주파수로 발진될 수 있게해 주므로 영상신호기록재생장치는 NTSC 방식으로 동작되게 된다.Next, the microprocessor 1 detects the signal of the terminal (③) and the signal of the terminal (⑥) and divides by 1/59712 times. That is, 1/59712 × 3.58 × 10 6 = 60 (Hz) is divided and the frequency divided by 60Hz is input to the terminal of the drum servo IC 4 through the terminal ⑤ of the microprocessor 1. Will be. Therefore, the video signal recording and reproducing apparatus is provided by allowing the oscillator built in the drum servo IC 4 to be oscillated at an NTSC frequency by adjusting the variable resistor VR1, the resistor R5, and the capacitor C4. Will operate in NTSC mode.
[고안의 효과][Effect of design]
이상 설명한 바와 같이 본 고안에 따르면, 1개의 마이크로프로세서를 사용하여 PAL 방식과 NTSC 방식의 2가지 서보 기준주파수를 발진시킬 수 있으므로 회로의 구성이 간단해 질 뿐만 아니라 고장률의 저하 및 원가를 절감할 수 있는 효과가 있다.As described above, according to the present invention, one microprocessor can be used to oscillate two servo reference frequencies of the PAL method and the NTSC method, thereby simplifying the circuit configuration and reducing the failure rate and cost. It has an effect.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019860003614U KR910008270Y1 (en) | 1986-03-25 | 1986-03-25 | Ntsc/pal double use serbo standard frequency oscilliation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019860003614U KR910008270Y1 (en) | 1986-03-25 | 1986-03-25 | Ntsc/pal double use serbo standard frequency oscilliation circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR870015577U KR870015577U (en) | 1987-10-26 |
| KR910008270Y1 true KR910008270Y1 (en) | 1991-10-15 |
Family
ID=19249860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019860003614U KR910008270Y1 (en) | 1986-03-25 | 1986-03-25 | Ntsc/pal double use serbo standard frequency oscilliation circuit |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR910008270Y1 (en) |
-
1986
- 1986-03-25 KR KR2019860003614U patent/KR910008270Y1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR870015577U (en) | 1987-10-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR860003722A (en) | Multi-Scan TV Receiver | |
| KR910008270Y1 (en) | Ntsc/pal double use serbo standard frequency oscilliation circuit | |
| KR920002834B1 (en) | Synchronization input for tv receiver on-screen alphanumeric display | |
| US3980927A (en) | Deflection circuit | |
| KR960005488Y1 (en) | Frequency converting apparatus | |
| KR970007482B1 (en) | Oscillation control apparatus for television | |
| KR860000730Y1 (en) | Video signal changing circuit | |
| KR0125469B1 (en) | Clock switching circuit of satellite receiver | |
| KR920006598Y1 (en) | Color singal processing circuit | |
| KR920007373Y1 (en) | Circuit for switching video | |
| KR100189518B1 (en) | Switching circuit of cable television | |
| KR880001279Y1 (en) | Color and green modulating circuit of a monitor | |
| JPS61128687A (en) | Demodulator | |
| KR920002236Y1 (en) | Switching circuit | |
| KR950001564B1 (en) | On-screen function circuit using teletext tv | |
| FR2372555A1 (en) | ||
| KR960010381Y1 (en) | Modem for catv converter | |
| JPS6328521B2 (en) | ||
| KR0173231B1 (en) | Lc resonance circuit of high frequency modulating unit | |
| JPS6123902Y2 (en) | ||
| CN2179676Y (en) | Multi-system colour television set | |
| JPS5926708Y2 (en) | Cross color erase circuit | |
| JPH0450671Y2 (en) | ||
| KR890004971Y1 (en) | Automatic frequency control convertor circuit | |
| KR900008278Y1 (en) | Automatic mode selecting circuit for tv/video |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E902 | Notification of reason for refusal | ||
| E701 | Decision to grant or registration of patent right | ||
| REGI | Registration of establishment | ||
| FPAY | Annual fee payment |
Payment date: 19980925 Year of fee payment: 8 |
|
| LAPS | Lapse due to unpaid annual fee |