KR920007933Y1 - Reproducing signal equalizing circuit of vhs/s-vhs type vtr - Google Patents
Reproducing signal equalizing circuit of vhs/s-vhs type vtr Download PDFInfo
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- KR920007933Y1 KR920007933Y1 KR2019880008792U KR880008792U KR920007933Y1 KR 920007933 Y1 KR920007933 Y1 KR 920007933Y1 KR 2019880008792 U KR2019880008792 U KR 2019880008792U KR 880008792 U KR880008792 U KR 880008792U KR 920007933 Y1 KR920007933 Y1 KR 920007933Y1
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
- G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
- G11B27/32—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on separate auxiliary tracks of the same or an auxiliary record carrier
- G11B27/322—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on separate auxiliary tracks of the same or an auxiliary record carrier used signal is digitally coded
- G11B27/324—Duty cycle modulation of control pulses, e.g. VHS-CTL-coding systems, RAPID-time code, VASS- or VISS-cue signals
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- Signal Processing (AREA)
- Television Signal Processing For Recording (AREA)
Abstract
내용 없음.No content.
Description
제1도의 (a)는 VHS방식 VTR에서의 기록 포맷(Format)을 나타내는 도면, (b)는 녹음전류 특성도, (c)는 휘도신호 대역 주파수 특성도.1A is a diagram showing a recording format in a VHS VTR, (b) is a recording current characteristic diagram, and (c) is a luminance signal band frequency characteristic diagram.
제2도는 본 고안의 회로도.2 is a circuit diagram of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
10 : 프리엠프 20 : 캐리어 검파기10: preamplifier 20: carrier detector
30 : S-VHS방식 경우의 이퀄라이저회로30: Equalizer circuit for S-VHS
40 : VHS방식 경우의 이퀄라이저회로40: Equalizer circuit in case of VHS method
50 : S-VHS 및 VHS방식 VTR의 재생시 고주파 FM로우 패스 필터50: High-frequency FM low pass filter during playback of S-VHS and VHS VTRs
Q1-Q6: 트랜지스터 T : 로터리트랜스Q 1 -Q 6 : Transistor T: Rotary Transformer
TA : 테이프 H : 비디오헤드TA: Tape H: Video Head
L1-L6: 코일 C1-C8: 콘덴서L 1 -L 6 : Coil C 1 -C 8 : Condenser
CT1: 가변콘덴서 VR1: 가변저항CT 1 : variable capacitor VR 1 : variable resistor
본 고안은 VHS 및 S-VHS 방식을 채용하는 VTR 재생시에 VTR의 호환성 유지와 고화질을 제공하고자하는 이퀄라이저 회로에 관한 것이다.The present invention relates to an equalizer circuit which is intended to maintain the compatibility of the VTR and to provide high image quality when reproducing the VTR employing the VHS and S-VHS schemes.
종래에는 이러한 이퀄라이저 회로를 구비하고 있지 못하므로해서, 재생시에는 VTR 전면에 장설된 선택스위치를 재생시마다 별도로 선택 조정해야만 하므로 그의 사용이 매우 번거롭고, 화질역시도 고화질을 제공하지 못하는 문제점이 있었다.In the related art, since the equalizer circuit is not provided, the selection switch installed on the front of the VTR must be separately selected and adjusted for each playback, so that the use of the equalizer circuit is very cumbersome, and there is a problem in that the image quality cannot be provided even in high quality.
즉, 종래의 VHS방식의 VTR에서는 제1도의 (a)(b)에서와 같이 휘도신호를 3.4~4.4MHZ로서 FM변조시키고, S-VHS방식에 있어서는 5.4~7MHZ로서 FM 변조를 시키는 것이었다.That is, in the conventional VHS VTR, the luminance signal is FM-modulated as 3.4 to 4.4 MHZ as in (a) and (b) of FIG. 1, and the FM modulation is performed as 5.4 to 7 MHZ in the S-VHS method.
그러나, VHS 방식과 S-VHS 방식은 근본적으로 제1도의 (c)에 도시한 바와 같이 휘도신호의 대역 주파수가 각기 상이하므로, 재생시에 신호의 이퀄라이저(등화)방식도 상이해야만 하는데 종래에는 이를 맞추기 위해서는 별도의 선택스위치를 선택조정 해야만 하였다.However, since the VHS and S-VHS schemes are fundamentally different in the frequency bands of the luminance signal as shown in (c) of FIG. 1, the equalizer (equalization) scheme of the signals must be different at the time of reproduction. In order to do this, a separate selection switch had to be adjusted.
본 고안은 종래의 문제점을 개선하고자하여 별도의 선택 모드 스위치의 조작없이도 자동적으로 VHS 및 S-VRS 이퀄라이저 기능을 수행하여 VTR의 호환성 유지와 고화질을 제공하고자 하는 것으로서, 이를 첨부한 도면에 의하여 상술하면 다음과 같다.The present invention is to improve the conventional problems and to automatically maintain the VTR and S-VRS equalizer function without the operation of a separate selection mode switch to provide compatibility and high quality of the VTR, as described in detail with reference to the accompanying drawings As follows.
제2도에서와 같이, 로터리 트랜스(T)의 2차측(N2)에 프리앰프(10)를 거쳐 저항(R1) 및 이에 직렬접속의 코일(L1), 콘덴서(C1)를 병력접속하여 트랜지스터(Q1)의 베이스측과 캐리어 검파기(20)를 접속하고, 트랜지스터(Q1)의 콜렉터측에는 코일(L3)(L4) 및 콘덴서(C4)(C5)(C6), 가변콘덴서(VR1)를 연결한 고주파 FM로우패스필터(50)를 접속하고, 상기 트랜지스터(Q1)의 에미터측에는 각각 트랜지스터(Q4), 가변저항(VR1) 및 콘덴서(C2), 저항(R4)을 연결한 S-VHS방식의 이퀄라이저 회로(30)와 트랜지스터(Q5), 가변저항(R5), 저항(R6), 코일(L2)(L6) 및 콘덴서(C3)를 연결한 VHS방식의 이퀄라이저 회로(40)를 연결하고, 상기 트랜지스터(Q4)의 베이스에 연결된 트랜지스터(Q3)의 콜렉터측은 트랜지스터(Q5)(Q6)의 베이스측과 저항 (R8)을 통해 트랜지스터(Q2)의 콜렉터측에 연결하며, 상기 트랜지스터(Q2)의 베니스측은 콘덴서(C6)를 통하여 트랜지스터(Q6)의 콜렉터에 연결하여서 구성한 것이다.As shown in FIG. 2 , the resistor R 1 and the coil L 1 and the capacitor C 1 connected in series are connected to the secondary side N 2 of the rotary transformer T via the preamplifier 10. The base side of the transistor Q 1 and the carrier detector 20 are connected to each other, and the collector side of the transistor Q 1 is connected to a coil L 3 (L 4 ) and a capacitor C 4 (C 5 ) (C 6 ). ) And a high frequency FM low pass filter 50 having a variable capacitor VR 1 connected thereto, and a transistor Q 4 , a variable resistor VR 1 , and a capacitor C at the emitter side of the transistor Q 1 , respectively. 2 ), S-VHS type equalizer circuit 30, resistor (R 4 ), transistor (Q 5 ), variable resistor (R 5 ), resistor (R 6 ), coil (L 2 ) (L 6 ) And a VHS equalizer circuit 40 having a capacitor C 3 connected thereto, and a collector side of the transistor Q 3 connected to the base of the transistor Q 4 is a base of the transistors Q 5 and Q 6 . Transistor (Q 2 ) via side and resistor (R 8 ) The Venice side of the transistor Q 2 is connected to the collector of transistor Q 6 via a capacitor C 6 .
미설명 부호 Vcc는 직류전원, 60은 저역변환 칼라신호(629 KHZ)를 3.58MVcc is a DC power supply, 60 is a low-pass color signal (629 KHZ) 3.58M
HZ로 변환하는 칼라프로세서, 70은 마이컴 모드 지정을 위한 장치의 프로세서, 80은 재생이퀄라이저 출력단자 신호가 가해지는 휘도신호 프로세서이다.A color processor for converting to HZ, 70 is a processor of the device for specifying the microcomputer mode, and 80 is a luminance signal processor to which a reproduction equalizer output terminal signal is applied.
이와같이 구성된 본 고안의 작용효과를 설명하면 다음과 같다.Referring to the effect of the present invention configured as described above are as follows.
제2도에서, 비디오 테이프(TA)에 기록된 정보 신호는 헤드(H)로부터 픽업되어 픽업된 신호는 미세한 신호로서, 로터리 트랜스(T)의 2차측인 스테이터(Stator) (N2)에 유기되고, 유기된 신호는 프리엠프(10)를 거쳐 미세한 고주파(RF) 신호가 증폭된다.In FIG. 2, the information signal recorded on the video tape TA is picked up from the head H, and the picked-up signal is a fine signal, which is transferred to the stator N 2 which is the secondary side of the rotary transformer T. The fine signal is amplified by the high frequency (RF) signal through the preamplifier 10.
이와같이 프리엠프(10)를 거쳐 증폭된 고주파신호는 저항(R1), 코일(L1) 및 콘덴서(C1)를 거쳐 대역 패킹(Peaking)이 이루어지게 되고, 이어서 트랜지스터(Q1)의 베이스와 캐리어 검파기(20) 및 칼라신호 프로세서(60)에 고주파 신호가 가해진다. 우선, 캐리어 검파기(20)에 입력된 고주파 FM (RF Envelope) 캐리어(Carrier)는 VHS재생시에는 로우신호를 S-VHS 재생시에는 하이 신호를 검출하여 장치의 제어신호(70)로서 사용된다.The high frequency signal amplified through the preamplifier 10 is banded through a resistor R 1 , a coil L 1 , and a capacitor C 1 , and then the base of the transistor Q 1 . And a high frequency signal are applied to the carrier detector 20 and the color signal processor 60. First, a high frequency FM (RF Envelope) carrier input to the carrier detector 20 is used as the control signal 70 of the device by detecting a low signal during VHS reproduction and a high signal during S-VHS reproduction.
즉, S-VHS 재생시에 하이 신호가 출력되면 장치의 제어신호(70)가 하이상태가 되어 마이컴(도시 생략함)에 입력되므로 선택모드 수행을 행함과 동시에 트랜지스터(Q3)의 베이스측에 가해져 반전되고, 동시에 트랜지스터(Q4)가 도통되어 이퀄라이저회로(30)는 이퀄라이저 기능을 수행한다.In other words, if a high signal is output during S-VHS reproduction, the control signal 70 of the device becomes high and is input to the microcomputer (not shown), so that the selection mode is performed and applied to the base side of the transistor Q 3 . Inverted and at the same time transistor Q 4 is turned on so that equalizer circuit 30 performs an equalizer function.
이때에 저항(R4), 콘덴서(C2) 및 가변저항(VR1)은 S-VHS시에 트랜지스터(Q4)가 도통됨에 따라 콘덴서(C2), 저항(R4) 및 가변저항(VR1)의 시정수 값에 따라서 이퀄라이저 량을 조정하게 된다.Resistance in this case (R 4), capacitor (C 2) and a variable resistor (VR 1) is as a transistor (Q 4) conductive during the S-VHS capacitor (C 2), a resistance (R 4) and a variable resistance ( The equalizer amount is adjusted according to the time constant value of VR 1 ).
한편, VHS 방식 경우의 이퀄라이저회로(40)와 트랜지스터(Q6)는 기존의 VHS 재생시에 이퀄라이저 동작을 수행하는 것으로서, 캐리어 검파기(20)에서는 이 경우에 로우신호가 출력되므로 트랜지스터(Q3)(Q4)는 차단되고, 이때 저항(R8)을 통한 Vcc전원은 트랜지스터(Q5)의 베이스측에 가해져 트랜지스터(Q5)를 도통시키므로서 이퀄라이저 회로(40)가 동작된다.On the other hand, the equalizer circuit 40 and the transistor Q 6 in the case of the VHS method perform an equalizer operation during the reproduction of the conventional VHS. The carrier detector 20 outputs a low signal in this case, so that the transistor Q 3 ( Q 4) is cut off, wherein the power Vcc via a resistor (R 8) is applied to the base-side because the transistor (Q 5) interconnecting standing the equalizer circuit 40, the transistor (Q 5) operation.
이와 동시에 트랜지스터(Q6)도 Vcc전원에 의해 도통하게 되어 고주파 대역을 차단하므로 고주파 FM로우패스필터(50)의 VHS, S-VHS방식의 종합특성을 결정하게 된다.At the same time, the transistor Q 6 is also turned on by the Vcc power supply and cuts off the high frequency band, thereby determining the overall characteristics of the VHS and S-VHS methods of the high frequency FM low pass filter 50.
여기서, 코일(L3), 콘덴서(CT1) 및 가변콘덴서(CT1)는 저역변환 색신호의 트랩(Trap)역할을 수행하고, 코일(L4), 콘덴서(C5)(C6)는 휘도 신호의 로우패스필터의 차단점을 결정하는 역할을 행한다.Here, the coil L 3 , the capacitor CT 1 , and the variable capacitor CT 1 serve as traps of the low-conversion color signal, and the coil L 4 and the capacitor C 5 (C 6 ) It serves to determine the cutoff point of the low pass filter of the luminance signal.
이와 같이 하여 휘도신호의 기록주파수가 각각 상이한 VHS와 S-VHS방식의 호완성을 유지시켜 에미터 플로워 트랜지스터(Q2)를 통하여 휘도신호 프로세서(8。)에 공급되므로서 VHS시에는 해상도가 240본이고, VHS시에는 400본 이상을 확보하게 된다.In this way, the VHS and S-VHS schemes maintain compatibility with each other, and the recording frequency of the luminance signals is supplied to the luminance signal processor 8 ° through the emitter follower transistor Q 2 . In case of VHS, more than 400 copies will be secured.
이상에서와 같이 동작되는 본 고안은 S-VHS방식의 VTR과 VHS방식의 VTR테이프의 상용상의 호환성을 유지시킬 뿐만아니라, 고해상도의 화면을 제공하는 효과가 있는 것이다.The present invention operated as described above has the effect of providing a high resolution screen as well as maintaining commercial compatibility of the VTR tape of the S-VHS type VTR tape.
Claims (4)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019880008792U KR920007933Y1 (en) | 1988-06-08 | 1988-06-08 | Reproducing signal equalizing circuit of vhs/s-vhs type vtr |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019880008792U KR920007933Y1 (en) | 1988-06-08 | 1988-06-08 | Reproducing signal equalizing circuit of vhs/s-vhs type vtr |
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| KR900001482U KR900001482U (en) | 1990-01-18 |
| KR920007933Y1 true KR920007933Y1 (en) | 1992-10-22 |
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| KR20000052610A (en) * | 1998-12-31 | 2000-08-25 | 이봉근 | Twisting machine for silk yarn |
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| KR20000052610A (en) * | 1998-12-31 | 2000-08-25 | 이봉근 | Twisting machine for silk yarn |
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