KR910004667Y1 - Playing control signal compensation circuit for vcr - Google Patents
Playing control signal compensation circuit for vcr Download PDFInfo
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- KR910004667Y1 KR910004667Y1 KR2019870023890U KR870023890U KR910004667Y1 KR 910004667 Y1 KR910004667 Y1 KR 910004667Y1 KR 2019870023890 U KR2019870023890 U KR 2019870023890U KR 870023890 U KR870023890 U KR 870023890U KR 910004667 Y1 KR910004667 Y1 KR 910004667Y1
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- transistor
- resistor
- control signal
- vcr
- amplifier
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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
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/584—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on tapes
-
- 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
- G11B5/008—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires
- G11B5/00813—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic tapes
-
- 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
Landscapes
- Television Signal Processing For Recording (AREA)
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Abstract
내용 없음.No content.
Description
제 1 도는 본 고안에 따른 재생 콘트롤신호 보정회로의 블록구성도.1 is a block diagram of a reproduction control signal correction circuit according to the present invention.
제 2 도는 제 1 도의 상세회로도.2 is a detailed circuit diagram of FIG.
제 3 도는 제 2 도의 각부 파형도.3 is a waveform diagram of each part of FIG.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 재생콘트롤 헤드 Q1-Q5: 트랜지스터1: Regeneration control head Q 1 -Q 5 : Transistor
2 : 증폭기 Rl-Rm: 저항2: amplifier R l -R m : resistance
3 : 제 1 궤환부 C1-C2: 콘덴서3: first feedback part C 1 -C 2 : condenser
4 : 제 2 궤환부 D1: 다이오우드4: second feedback unit D 1 : diode
5 : 스위치부 6 : 모노멀티 바이브레이터5 switch portion 6 monomulti vibrator
본 고안은 VCR의 재생 콘트롤 신호 증폭도 자동조절회로에 관한 것으로 특히 저레벨 콘트롤 펄스 테이프의 재생시 서보계의 불안정을 방지시켜 안정된 화면 상태를 유지시키도록 한 재생 콘트롤 보정회로에 관한 것이다.The present invention relates to an automatic control circuit for amplifying the reproduction control signal of a VCR, and more particularly, to a reproduction control correction circuit for maintaining a stable screen state by preventing the instability of the servo system during the reproduction of a low level control pulse tape.
종래의 기술은 비데오 테이프의 하단에 기록된 콘트롤 펄스의 레벨을 단순히 증폭하는 증폭회로인데, 노후화된 테이프 즉 콘트롤 펄스 레벨이 낮은 테이프일 경우에는 감지레벨까지 증폭되지 않아 화면이 불안정하게 되었다.The conventional technique is an amplifying circuit that simply amplifies the level of the control pulse recorded on the bottom of the video tape. In the case of an aging tape, that is, a tape having a low control pulse level, the detection level is not amplified until the detection level becomes unstable.
이것을 개선시킨 기준의 기술로는 증폭기의 증폭레벨을 최대로 하여 정상적인 테이프 재생시에는 노이즈까지 증폭되어 재생되므로 또 다른 화면상의 불안을 초래하여 되는 문제점이 있었다.As a standard technique to improve this, there is a problem in that the amplification level of the amplifier is maximized and the noise is reproduced by amplifying the noise during normal tape reproduction, resulting in further anxiety on the screen.
이에 본 고안은 상기한 문제점을 개선시키기 위해 안출된 것으로써 모노멀티 바이브레이터에 의해 콘트롤 펄스 감지레벨을 측정하여 스위칭 부를 제어하므로써 증폭기부의 궤환저항 값을 변화시켜 저레벨 콘트롤펄스 테이프의 재생시 서보계의 불안정을 방지시키도록 한 것으로, 이하 그의 기술구성을 첨부된 도면에 따라 설명하면 다음과 같다.Therefore, the present invention has been devised to improve the above problems, and by controlling the switching unit by measuring the control pulse detection level by a monomulti vibrator, the feedback resistance of the amplifier unit is changed by changing the feedback resistance of the amplifier unit. In order to prevent the present invention, the following describes its technical configuration according to the accompanying drawings.
제 1 도는 본 고안에 따른 재생콘트롤 신호 보정회로의 블록구성도를 나타낸 것으로 그의 연결구성을 살펴보면, 재생 콘트롤 헤드(1)가 증폭기(2)를 거쳐 모노멀티바이브레이터(6)에 접속되는 모노멀티바이브레이터(6)의 출력단은 스위치부(5)에 접속되어 증폭기(2)의 제 2 궤환부(4)를 제어하도록 구성한 것으로 상기 구성을 제 2 도의 상세도에 따라 설명하면 재생 콘트롤헤드(1)는 증폭기(2)의 마이너스 입력단에 그 마이너스 입력단은 저항(R1)과 콘덴서(C2)의 제 1 궤환부(3)와 저항(R2)과 트랜지스터(Q1)의 제 1 부궤환부(4)를 거여 증폭기(2)의 출력단에 접속되고 상기 증폭기(2)의 출력단은 저항(R9-R13)과 트랜지스터(Q4, Q5)로 구성된 모노멀티 바이브레이터(6)를 거쳐 트랜지스터(Q2, Q3)와 저항(R3-R7) 및 다이오우드(D1)와 콘덴서(C1)로 구성된 스위치부(5)의 트랜지스터(Q3) 베이스에 접속되고, 상기 트랜지스터(Q2)의 콜렉터는 트랜지스터(Q1)의 베이스에 접속되며 그 베이스는 트랜지스터(Q3)와 저항(R6, R17)을 거쳐 저항(R14)의 일단에 접속되도록 구성한 것으로 이하 그의 동작상태 및 작용효과를 첨부된 도면에 따라 설명하면 다음과 같다.1 shows a block diagram of a regeneration control signal correction circuit according to the present invention. Looking at the connection configuration thereof, a monomultivibrator in which a regeneration control head 1 is connected to a mono vibrator 6 via an amplifier 2 is illustrated. The output terminal of (6) is connected to the switch section 5 and configured to control the second feedback section 4 of the amplifier 2. The above configuration will be explained according to the detail of FIG. At the negative input terminal of the amplifier 2, the negative input terminal has a first feedback part 3 of the resistor R 1 and the capacitor C 2 and a first negative feedback part of the resistor R 2 and the transistor Q 1 . 4) is connected to the output terminal of the amplifier (2) and the output terminals of the amplifier (2) via a multi-vibrator (6) consisting of resistors (R 9- R 13 ) and transistors (Q 4 , Q 5 ) Q 2, Q's consisting of 3) and a resistor (R 3 -R 7) and the diode (D 1) and capacitor (C 1) It is connected to the transistor (Q 3), the base of the teeth (5), the collector of the transistor (Q 2) is connected to the base of the transistor (Q 1) that the base is a transistor (Q 3) and a resistor (R 6, R 17 It is configured so as to be connected to one end of the resistor (R 14 ) via the following) The operation state and the effect thereof will be described according to the accompanying drawings.
제 2 도에서 재생 콘트롤 헤드(1)로 부터 콘트롤펄스가 감지되면 재생된 콘트롤 펄스가 증폭기(2)의 마이너스 입력단에 인가되어 증폭되고, 그 증폭된 신호는 제 3a 도와 같이 되어 저항(R14(R9)에 의해 모노멀티바이브레이터(5)의 트랜지스터(Q4) 베이스에 인가되어 트랜지스터(Q4) (Q5)를 교호적으로 온/오프 시키는데, 입력된 신호가 하이(L1)일 경우에는 트랜지스터(Q4)를 온시키며 트랜지스터(Q5)를 오프시키고, 로우(L)일 경우에는 트랜지스터(Q4)를 오프시키며 트랜지스터(Q5)를 온시키게 된다.No. If in Fig from the playback control head (1) controls the pulse is detected, the reproduced control pulse is amplified, it is applied to the negative input terminal of the amplifier (2), the amplified signal is, as to help the 3a resistance (R 14 ( transistor of mono-multi vibrator 5 by R 9) (Q 4) when applied to the base transistor (Q 4) (Q 5) the sikineunde on / off alternately, the input signal is high (L 1) In turn, transistor Q 4 is turned on and transistor Q 5 is turned off. In case of low L, transistor Q 4 is turned off and transistor Q 5 is turned on.
상기에 따라 트랜지스터(Q5)의 콜렉터로는 제 3b 도와 같은 파형이 출력되어 스위치부(5)의 트랜지스터(Q3) 베이스에 인가되므로 트랜지스터(Q3)를 온/오프시키게 되는데, 상기 트랜지스터(Q3)가 오프되었을시에는 콘덴서(C1)에 전하가 충전되고 트랜지스터(Q3)를 통해 방전하게 된다.According to the above, as the collector of the transistor Q 5 , a waveform like the third diagram is output and applied to the base of the transistor Q 3 of the switch unit 5, thereby turning on / off the transistor Q 3 . When Q 3 ) is off, charge is charged in the capacitor C 1 and discharged through the transistor Q 3 .
이때 트랜지스터(Q3)를 온/오프시키는데 제 3b 도의 파형에서 T1구간이 T2구간보다 길게 되어있으므로 트랜지스터(Q3)의 구동시간이 길어 콘덴서(C1)의 출전시간을 짧고 방전시간은 충분히 길게 된다.At this time, the transistor Q 3 is turned on / off. In the waveform of FIG. 3b, since the T 1 section is longer than the T 2 section, the driving time of the transistor Q 3 is long, so that the output time of the capacitor C 1 is short and the discharge time is It is long enough.
그러므로 스위치부(5)의 트랜지스터(Q2)는 거의 동작되지 않게되고, 트랜지스터(Q1)의 베이스에는 하이(H) 상태의 전위가 유기되어 있어 트랜지스터(Q1)를 구동시키므로 저항(R2)에 의한 궤환이 저항(R1)은 통한 궤환과 동시에 이루어져 결과적으로 정상적인 콘트롤펄스가 감지되면 저항(R2) (R1)의 병렬저항치에 의해 궤환이 된다.Therefore, transistor (Q 2) of the switch unit 5 is hardly operates, there is a base, the potential of the high (H) state of the transistor (Q 1) is organic because drives the transistor (Q 1), the resistance (R 2 ) Feedback by resistance (R 1 ) is made at the same time as the feedback through the consequent normal control pulse is detected as a result of the feedback by the parallel resistance of the resistor (R 2 ) (R 1 ).
그리고 전술한 바와 반대로 저레벨 콘트롤 펄스가 재생 콘트롤헤드(1)에 의해 감지되면 증폭기(2)의 입력도 낮아져 캡스턴 콘트롤에 정상적으로 수행될 수 없으며 모노멀티바이브레이터(6)의 출력파형인 제 3b 도의 파형에서 구간 T1, T2가 변화하여 콘덴서(C1)의 충, 방전전위가 충분히 트랜지스터(Q2)를 구동시키므로 트랜지스터(Q2)의 베이스 전위가 낮아져 트랜지스터(Q2)를 오프시키게 된다.On the contrary, when the low level control pulse is detected by the regeneration control head 1, the input of the amplifier 2 is also lowered, which cannot be normally performed in the capstan control, and in the waveform of FIG. intervals T 1, T 2, thereby changing the capacitor (C 1) a base potential of the charge, because the discharge potential is sufficiently drive the transistor (Q 2) transistors (Q 2) low turning off the transistor (Q 2) of the.
상기 트랜지스터(Q2)의 오프에 따라 저항(R2)은 차단되고 저항(R1)에 의해서만 궤환되어 증폭출력은 증대하고 증폭기(2)의 감지레벨까지 올라 가게되고, 이와 동시에 시스템의 안정을 위해서 트랜지스터(Q6)가 도통되어 순간적인 콘트롤펄스 유동계의 발진현상을 방지시키게 된다.As the transistor Q 2 is turned off, the resistor R 2 is cut off and fed back only by the resistor R 1 so that the amplification output is increased and the detection level of the amplifier 2 is raised. Transistor Q 6 is turned on to prevent oscillation of instantaneous control pulse flow system.
즉 트랜지스터(Q4)의 동작을 현상태로 유지하도록 고정시킨다.That is, the operation of the transistor Q 4 is fixed to maintain the present state.
그러나 저항(R16)이 있으므로 트랜지스터(Q4)의 베이스에는 작용을 변화시킬 수 없는 전위까지 항상 전달되다가 정상 레벨테이프를 재생하거나 재생레벨이 갑자기 상승할 경우에는 또다시 상태를 반전시킬 수 있도록 설정된다.However, since there is a resistor (R 16 ), the base of the transistor (Q 4 ) is always delivered to a potential that cannot change the action, so that the state can be reversed again when regenerating the normal level tape or when the regeneration level suddenly increases do.
따라서 본 고안에 따른 VCR의 재생콘트롤신호 보정회로는 이상의 설명에서와 같이, 간단한 회로를 연결 구성시켜 저레벨 콘트롤 펄스 테이프의 재생시 서보계의 불안정을 방지시켜 주므로써 항상 안정된 화면 상태를 시청자에게 제공하는 효과를 갖게 된다.Therefore, the playback control signal correction circuit of the VCR according to the present invention, as described above, by connecting a simple circuit to prevent the instability of the servo system during the playback of the low-level control pulse tape to provide a stable screen state to the viewer at all times Will have an effect.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019870023890U KR910004667Y1 (en) | 1987-12-30 | 1987-12-30 | Playing control signal compensation circuit for vcr |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019870023890U KR910004667Y1 (en) | 1987-12-30 | 1987-12-30 | Playing control signal compensation circuit for vcr |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR890014404U KR890014404U (en) | 1989-08-10 |
| KR910004667Y1 true KR910004667Y1 (en) | 1991-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019870023890U KR910004667Y1 (en) | 1987-12-30 | 1987-12-30 | Playing control signal compensation circuit for vcr |
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| Country | Link |
|---|---|
| KR (1) | KR910004667Y1 (en) |
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1987
- 1987-12-30 KR KR2019870023890U patent/KR910004667Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR890014404U (en) | 1989-08-10 |
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