KR970005043Y1 - Auto-transfer circuit of pal bg and n-pal at the time of vcr reproducing - Google Patents
Auto-transfer circuit of pal bg and n-pal at the time of vcr reproducing Download PDFInfo
- Publication number
- KR970005043Y1 KR970005043Y1 KR2019910007684U KR910007684U KR970005043Y1 KR 970005043 Y1 KR970005043 Y1 KR 970005043Y1 KR 2019910007684 U KR2019910007684 U KR 2019910007684U KR 910007684 U KR910007684 U KR 910007684U KR 970005043 Y1 KR970005043 Y1 KR 970005043Y1
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- KR
- South Korea
- Prior art keywords
- pal
- output
- oscillator
- circuit
- color
- Prior art date
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
- G11B5/027—Analogue recording
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
- H04N7/0105—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level using a storage device with different write and read speed
- H04N7/011—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level using a storage device with different write and read speed using magnetic recording
Abstract
내용없음.None.
Description
제1도는 본 고안의 회로도1 is a circuit diagram of the present invention
제2도는 본 고안에 따른 파형도2 is a waveform diagram according to the present invention
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 칼라 RF 발생부 2 : BG회로1: Color RF Generator 2: BG Circuit
3 : APC 부 4 : 제1LPF3: APC Part 4: First LPF
5 : 제1발진기 6 : 제2발진기5: first oscillator 6: second oscillator
7 : 주파수변환기 8 : 제2LPF7: frequency converter 8: second LPF
9 : 증폭기 10 : 다이오드클리퍼9: amplifier 10: diode clipper
11 : 적분회로 12 : 비교기11: integrating circuit 12: comparator
본 고안은 VCR의 재생시 PAL BG(Phase Alternation By Line)(Burst Gate)와 N-PAL방식의 자동전환회로에 관한 것으로 특히 629kHz발진기를 이용한 고정발진과 재생 주파수와의 파이를 비교하여 PAL BG 와 N-PAL을 자동전환시킬수 있도록 한 것이다.The present invention relates to a PAL BG (Purse Alternation By Line) (Burst Gate) and an N-PAL type automatic switching circuit during the playback of a VCR. In particular, PAL BG and N-PAL can be switched automatically.
종래에는 VCR에서 테이프 재생시 PAL BG와 N-PAL방식을 자동 전환 시킬수 있는 회로가 없었다.Conventionally, there is no circuit that can automatically switch between PAL BG and N-PAL methods when playing a tape in a VCR.
본 고안은 이와 같은 종래의 결점을 감안하여 안출한 것으로 PAL BG 와 N-PAL 테이프 재생시 이를 자동 전환시킬 수 있는 회로를 제공하는데 그 목적이 있다.The present invention has been made in view of such a conventional drawback, and its object is to provide a circuit that can automatically switch between PAL BG and N-PAL tape playback.
이하에서 이와 같은 목적을 달성하기 위한 본 고안의 실시예를 첨부된 도면에 의하여 상세히 설명하면 다음과 같다.Hereinafter, described in detail by the accompanying drawings an embodiment of the present invention for achieving the above object.
먼저 제1도는 본고안의 회로도로 칼라 RF(Radio Frequency)를 출력시키는 칼라 RF 발생부(1)와, 상기 칼라 RF 발생부(1)의 출력중 버스트 신호만을 검출하는 BG회로(2)와 상기 BG회로(2)에 의해 검출된 버스트신호의 위상을 안정화시키기 위한 APC(Automatic Phase Control)부(3)와, 상기 APC부(3)이 출력을 필터시키는 제1LPF(4)와 상기 제1LPF(4)로부터 출력되는 신호를 받아 일정 주파수(예를들어 627kHz)를 발생시켜 상기 APC부(3)로 보내는 제1발진기(5)와, 628kHz의 주파수를 발생시키는 제2발진기(6)와 상기 제1발진기(5)와 제2발진기(6)로부터 발생되는 주파수를 받아 이들의 합,차성분을 변환시키는 주파수 변환기(7)와, 상기 주파수 변환기(7)의 출력을 필터시키는 제2LPF(8)와, 상기 제2LPF(8)의 출력을 증폭시키는 증폭부(9)와 상기 증폭부(9)의 출력을 클리핑 시키는 다이오드(D1), (D2) 및 인버터(I1)로 이루어진 다이오드 클리퍼(10)와 상기 다이오드 클리퍼(10)의 출력을 적분시키는 저항(R1)과 콘덴서(C1)로 이루어진 적분회로(11)와 상기 적분회로(11)의 출력전압과 저항(R2), (R3)에 의한 기준 전압과를 비교하는 비교기(12)를 구비하여서 이루어진다.First, the circuit diagram of the present invention is a color RF generator 1 for outputting color RF (Radio Frequency), a BG circuit 2 for detecting only a burst signal of the output of the color RF generator 1 and the BG. APC (Automatic Phase Control) section 3 for stabilizing the phase of the burst signal detected by the circuit 2, a first LPF 4 through which the APC section 3 filters the output, and the first LPF 4 The first oscillator 5 generating a predetermined frequency (for example, 627 kHz) and sending it to the APC unit 3, the second oscillator 6 generating the frequency of 628 kHz and the first A frequency converter 7 which receives frequencies generated from the oscillator 5 and the second oscillator 6 and converts the sum and difference components thereof; a second LPF 8 which filters the output of the frequency converter 7; a diode (D 1), (D 2) for clipping the output of the amplifier unit 9 and the amplification unit (9) for amplifying an output of the first 2LPF (8) A diode clipper 10 and the diode clipper 10, the integration circuit 11 and the integration circuit 11 consisting of a resistor (R 1) and a capacitor (C 1) for integrating the output of the consisting of the inverter (I 1) And a comparator 12 for comparing the output voltage with the reference voltage by the resistors R 2 and R 3 .
이와 같이 구성된 본 고안은 칼라 RF 발생부(1)로부터 제2도 (a)와 같은 칼라 RF가 출력되면 BG회로(2)에 의해 RF 신호중 제2도(b)와 같은 버스트 신호가 검출된다.According to the present invention configured as described above, when the color RF as shown in FIG. 2 (a) is output from the color RF generator 1, the burst signal as shown in FIG. 2 (b) is detected by the BG circuit 2.
이렇게 검출된 버스트 신호는 APC(Automatic Phase Control)부(3)를 통하면서 위상이 안정화되고 제1LPF(Low Pass Filter)(4)를 통하여 필터된 다음 제1발진기(5)를 거쳐 주파수 변환기(7)로 보내진다.The burst signal thus detected is stabilized in phase through the APC (Automatic Phase Control) section 3, filtered through a first low pass filter (LPF) 4, and then through the first oscillator 5 to the frequency converter 7. Is sent).
따라서, 상기 제1발진기(5)를 통하여 주파수 변환기(7)로 보내진 신호와 제2발진기(6)로부터 발생된 신호와의 합, 차가 이루어져 칼라 RF부 (1)가 PAL BG일때는 주파수 변환기(7)의 출력은 627kHzDHK 629kHz의 합, 차성분인 2kHz와 1.256MHz가 되고 N-PAL일때는 0과 1.258MHz가 되어 제2LPF(8)를 통과하면서 출력 주파수가 PAL BG 의 경우는 0Hz가 되고 N-PAL의 경우는 2kHz가 된다.Therefore, the sum and the difference between the signal sent to the frequency converter 7 through the first oscillator 5 and the signal generated from the second oscillator 6 are different. 7) is the sum of 627kHz DHK 629kHz, the difference component is 2kHz and 1.256MHz, and when it is N-PAL, it becomes 0 and 1.258MHz. For PAL, this is 2 kHz.
또한, 상기 제2LPF(8)의 출력은 증폭부(9)를 통하여 증폭된 후 다이오드 클리터(10)의 다이오드(D2)를 통과하면서 (+)방향의 성분이 출력되고 다이오드(D1)를 통과하면서 (-)방향의 성분이 출력되는데 다이오드(D1)를 통한 (-)성분은 인버터(I1)를 거쳐 상기 다이오드(D2)의 (+)성분과 합쳐져 저항(R1)과 콘덴서(C1)로 이루어진 적분회로(11)를 거침으로 일정 전압을 발생시킨다.In addition, the output of the second LPF 8 is amplified by the amplifier 9 and then passes through the diode D 2 of the diode clutter 10 while outputting a positive component and outputting the diode D 1 . while passing through the (-) there is the output component of the direction of the diode (D 1) a via (-) component is an inverter (I 1) a through the diode resistance combined with (+) component of (D 2) (R 1) and A constant voltage is generated by passing through an integrated circuit 11 composed of a capacitor C 1 .
따라서, 비교기(12)에서는 상기 적분회로(11)로부터 출력되는 전압과 저항(R2), (R3)에 의한 기준전압과를 비교하여 PAL BG일때는 로우레벨을 그리고 N-PAL일때는 하이 레벨을 자동적으로 전환시켜 출력시킨다.Accordingly, the comparator 12 compares the voltage output from the integrating circuit 11 with the reference voltages of the resistors R 2 and R 3 , and the low level when the PAL BG is high, and the high when the N-PAL. The level is automatically switched and output.
이상에서 설명한 바와 같이 본 고안은 629kHz 발진기를 이용한 고정 발진과 재생 주파수와의 차이를 비교하여 PAL BG와 N-PAL을 자동 전환시킬 수 있는 효과가 있다.As described above, the present invention has an effect of automatically switching PAL BG and N-PAL by comparing the difference between the fixed oscillation using the 629 kHz oscillator and the reproduction frequency.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019910007684U KR970005043Y1 (en) | 1991-05-28 | 1991-05-28 | Auto-transfer circuit of pal bg and n-pal at the time of vcr reproducing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019910007684U KR970005043Y1 (en) | 1991-05-28 | 1991-05-28 | Auto-transfer circuit of pal bg and n-pal at the time of vcr reproducing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR920022039U KR920022039U (en) | 1992-12-19 |
| KR970005043Y1 true KR970005043Y1 (en) | 1997-05-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019910007684U KR970005043Y1 (en) | 1991-05-28 | 1991-05-28 | Auto-transfer circuit of pal bg and n-pal at the time of vcr reproducing |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR970005043Y1 (en) |
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1991
- 1991-05-28 KR KR2019910007684U patent/KR970005043Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR920022039U (en) | 1992-12-19 |
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