KR890000780Y1 - Reference signal detecting circuit of video tape recorder - Google Patents
Reference signal detecting circuit of video tape recorder Download PDFInfo
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- KR890000780Y1 KR890000780Y1 KR2019850013790U KR850013790U KR890000780Y1 KR 890000780 Y1 KR890000780 Y1 KR 890000780Y1 KR 2019850013790 U KR2019850013790 U KR 2019850013790U KR 850013790 U KR850013790 U KR 850013790U KR 890000780 Y1 KR890000780 Y1 KR 890000780Y1
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/46—Controlling, regulating, or indicating speed
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/1883—Driving; Starting; Stopping; Arrangements for control or regulation thereof for record carriers inside containers
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Abstract
내용 없음.No content.
Description
제1도는 종래의 검출회로도.1 is a conventional detection circuit diagram.
제2도는 제1도의 각부의 파형도.2 is a waveform diagram of each part of FIG.
제3도는 본 고안의 검출회로도.3 is a detection circuit diagram of the present invention.
제4도는 제3도 각부의 파형도.4 is a waveform diagram of each part of FIG.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 동기분리회로 2 : 드럼모우터제어계1: Synchronous separation circuit 2: Drum motor control system
D1, D2: 다이오드 TR1: 트랜지스터D 1 , D 2 : Diode TR 1 : Transistor
R1-R11: 저항 C1-C6: 콘덴서R 1 -R 11 : Resistor C 1 -C 6 : Capacitor
COM1: 비교기 A : 검출레벨 선택신호 입력단자COM 1 : Comparator A: Detection level selection signal input terminal
본 고안은 비데오테이프에 영상신호를 기록 및 재생하는 비디오테이프 레코오더에 있어서, 영상신호의 기록시 영상신호내에 포함되어 있는 수직동기신호로 기준신호를 검출하여 드럼모우터 제어계에 입력시키는 기준신호 검출회로에 관한 것이다.The present invention provides a video tape recorder for recording and reproducing a video signal on a video tape, wherein a reference signal is detected by inputting a reference signal to a drum motor control system by detecting a reference signal with a vertical synchronous signal included in the video signal. It is about a circuit.
일반적으로 비디오테이프 레코오더는 영상신호를 기록할 경우에 영상신호에 포함되어 있는 수직동기신호를 비디오테이프의 소정위치에 기록함과 동시에 그 수직 동기신호에 따른 기준신호를 검출하고, 그 검출된 기준신호를 드럼모우터 제어계에 입력시켜 드럼모우터의 회전속도를 제어하는 기준신호로 사용하고 있는데, 종래의 기준신호 검출회로는 제1도에 도시한 바와 같이 영상신호로 부터 동기신호를 분리하는 동기분리회로(1)의 출력측을 저항(R1) 및 접지콘덴서(C1), 저항(R2), 접지콘덴서(C2), 콘덴서(C3)를 통해 비교기(COM1)의 비반전입력단자(+)에 접속하고, 비교기(COM1)의 반전 입력단자(-)에는 전원단자(Vcc)에 직렬로 접속된 저항(R3)(R4)의 접속점을 접속하여 그의 출력측을 드럼모우터제어계(2)의 입력측에 접속하였다.In general, a video tape recorder records a vertical synchronous signal included in a video signal at a predetermined position on a video tape when recording a video signal, and simultaneously detects a reference signal according to the vertical synchronous signal, and detects the detected reference signal. Is used as a reference signal for controlling the rotational speed of the drum motor by inputting it to the drum motor control system. The conventional reference signal detection circuit separates the synchronous signal from the video signal as shown in FIG. The non-inverting input terminal of the comparator COM 1 is connected to the output side of the circuit 1 through a resistor R 1 and a ground capacitor C 1 , a resistor R 2 , a ground capacitor C 2 , and a capacitor C 3 . Connect to the positive terminal, connect the connection point of the resistor R 3 (R 4 ) connected in series with the power supply terminal Vcc to the inverting input terminal (-) of the comparator COM 1 , and connect the output of the drum motor. It was connected to the input side of the control system 2.
이와 같이 구성된 종래의 기준신호 검출회로는 동기분리회로(1)가 영상신호로 부터 동기신호를 분리하여 제2도의 (a)에 도시한 바와 같이 수평동기신호, 등화펄스신호, 수직동기신호, 등화펄스신호를 순차적으로 출력하면, 그 출력된 동기신호는 저항(R1) 및 콘덴서(C1)를 통해 제2도의 (b)에 도시한 바와 같이 적분되고, 저항(R2) 및 콘덴서(C2)를 통해 제2도의 (c)에 도시한 바와 같이 다시 적분된 후 콘덴서(C2)를 통해 비교기(COM1)의 비반전입력단자(+)에 입력되고, 이때 비교기(COM1)의 반전입력단자 (-) 전원단자(Vcc)에 인가된 전원을 저항(R3)(R4)으로 분할한 기준전압(Ve)이 인가되어 있으므로 비교기(COM1)의 출력측에는 제2도의 (d)에 도시한 바와 같이 고전위 즉, 기준신호가 출력되고, 그 출력된 기준신호는 드럼모우터제어계(2)에 입력되어 드럼모우터를 회전시키는 기준신호로 사용된다.In the conventional reference signal detection circuit configured as described above, the synchronous separation circuit 1 separates the synchronous signal from the image signal, so that the horizontal synchronous signal, the equalized pulse signal, the vertical synchronous signal, and the equalized signal as shown in FIG. When the pulse signal is sequentially output, the output synchronizing signal is integrated through the resistor R 1 and the capacitor C 1 as shown in FIG. 2B, and the resistor R 2 and the capacitor C. FIG. 2) through being input to the non-inverting input terminal (+) of the comparator (COM 1) through the re-integrated after the capacitor (C 2) as shown in the second degree (c), wherein the comparator (COM 1) Since the reference voltage Ve obtained by dividing the power applied to the inverting input terminal (-) power terminal (Vcc) by the resistor (R 3 ) (R 4 ) is applied, the output side of the comparator (COM 1 ) As shown in Fig. 2), a high potential, that is, a reference signal is output, and the output reference signal is input to the drum motor control system 2 to supply a drum model. It is used as a reference signal for rotating the emitter.
그러나, 이와 같이 동작되는 종래의 기준신호 검출회로는 검출된 기준신호가 수직동기신호 보다 일정시간(T1) 지연되어 출력되므로 드럼모우터의 회전속도를 정확히 제어하지 못하여 수직동기신호를 비디오테이프의 정확한 위치에 기록시킬 수 없고, 또한 비디오테이프의 복제 방지등을 위하여 별도의 조작으로 동기분리회로(1)에서 수직동기신호가 출력되는 기간을 축소시키거나 또는 등화 펄스신호가 출력되는 기간에 수직동기신호가 출력되게하는 경우에는 검출된 기준신호도 그 위치가 변경되므로 드럼모우터의 기준신호가 불균일하게 되어 비디오 테이프에 기록된 영상신호가 깨끗하지 못한 결함이 있었다.However, in the conventional reference signal detection circuit operated as described above, the detected reference signal is output at a predetermined time (T 1 ) delayed from the vertical synchronization signal, so that the rotation speed of the drum motor cannot be accurately controlled, and thus the vertical reference signal cannot be controlled. In order to prevent the data from being recorded at the correct position and to prevent copying of the video tape, the operation of reducing the period during which the vertical synchronization signal is output from the synchronization separation circuit 1 or the vertical synchronization in the period during which the equalizing pulse signal is output by a separate operation is performed. In the case where the signal is outputted, the position of the detected reference signal is also changed, so that the reference signal of the drum motor is uneven, so that the video signal recorded on the video tape is not clean.
본 고안은 이와 같은 종래의 결함을 감안하여, 동기분리회로(1)에서 수직동기신호가 출력되면 바로 기준신호가 출력되게 함은 물론 수직동기신호의 축소 또는 위치이동을 시킬 경우에도 기준신호는 정확히 검출할 수 있게 안출한 것으로, 이를 첨부된 제3도 및 제4도를 참조하여 상세히 설명하면 다음과 같다.The present invention, in view of such a conventional defect, the reference signal is output as soon as the vertical synchronization signal is output from the synchronous separation circuit (1) as well as the reference signal is accurate even when the vertical synchronization signal is reduced or moved Detected to be detected, it will be described in detail with reference to FIGS. 3 and 4 attached as follows.
제3도는 본 고안의 기준신호 검출회로도로서, 이에 도시한 바와 같이 동기분리회로(1)의 출력측을 콘덴서(C4) 및 접지저항(R5), 다이오드(D1)를 통해 다이오드(D2)의 캐소드에 접속하고, 그 접속점은 저항(R6) 및 접지콘덴서(C5), 콘덴서(C6)를 통해 비교기 (COM2)의 비반전입력단자(+)에 접속하고, 비교기(COM2) 반전입력단자(-)에는 전원단자(Vcc)에 직렬로 접속된 저항(R7)(R8)의 접속점을 접속함과 동시에 검출레벨 선택신호입력단자(A)가 저항(R10)을 통해 베이스에 접속된 트랜지스터(TR1)의 콜렉터를 저항(R9)을 통해 접속하며, 비교기(COM2)의 출력측은 드럼모우터제어계(2)의 입력측에 접속하여 구성한 것이다.3 is a reference signal detection circuit diagram of the present invention, and as shown therein, the output side of the synchronous separation circuit 1 is connected to a diode D 2 through a capacitor C 4 , a ground resistor R 5 , and a diode D 1 . ), And its connection point is connected to the non-inverting input terminal (+) of the comparator (COM 2 ) through the resistor (R 6 ), the ground capacitor (C 5 ), and the capacitor (C 6 ), and the comparator (COM). 2 ) The inverting input terminal (-) is connected to the connection point of the resistor (R 7 ) (R 8 ) connected in series to the power supply terminal (Vcc) and the detection level selection signal input terminal (A) is connected to the resistor (R 10 ). The collector of the transistor TR 1 connected to the base is connected via a resistor R 9 , and the output side of the comparator COM 2 is connected to the input side of the drum motor control system 2.
이와 같이 구성된 본 고안 기준신호 검출회로의 작용효과를 상세히 설명하면 다음과 같다.Referring to the effect of the present invention reference signal detection circuit configured as described above in detail as follows.
전원단자(Vcc)에 전원이 입력되고, 영상신호가 입력되어 동기분리회로(1)의 출력측에 제4도의 (a)에 도시한 바와 같이 수평동기신호 및 등화펄스신호, 수직동기신호, 등화펄스신호가 일정주기 간격으로 출력되면, 그 출력된 신호는 콘덴서(C4) 및 저항 (R5)을 통해 제4도의 (b)에 도시한 바와같이 미분되고, 그 미분신호는 다이오드(D1)(D2)를 통해 제4도의 (c)에 도시한 바와 같이 전파정류되며, 저항(R6) 및 콘덴서(C5)를 통해 제4도의 (d)에 도시한 바와 같이 적분된 후 콘덴서(C6)를 통해 비교기(COM2)의 비반전입력단자(+)에 입력되고, 이때 비교기(COM2)의 반전입력단자(-)에는 전원단자(Vcc)의 전원을 저항(R7)(R8)으로 분할한 일정기준전압(Ve)이 인가되어 있으므로 비교기(COM2)의 출력측에는 제4도의 (e)에 도시한 바와 같이 동기분리회로(1)의 출력측에 수직동기신호가 출력되는 시간부터 기준신호가 출력되어 드럼모우터제어계(2)에 입력된다.Power is supplied to the power supply terminal Vcc, and an image signal is inputted to the output side of the synchronous separation circuit 1, as shown in Fig. 4A, a horizontal synchronization signal, an equalization pulse signal, a vertical synchronization signal, an equalization pulse. When the signal is output at regular intervals, the output signal is differentiated as shown in Fig. 4B through the capacitor C 4 and the resistor R 5 , and the differential signal is diode D 1 . Through (D 2 ), it is full-wave rectified as shown in (c) of FIG. 4 , and integrated as shown in (d) of FIG. 4 through the resistor (R 6 ) and the capacitor (C 5 ), and then the capacitor ( through C 6) is input to the non-inverting input terminal (+) of the comparator (COM 2), wherein the comparator (inverting input terminal (the COM 2) -), the resistance power to the power supply terminal (Vcc) (R 7) ( is a predetermined reference voltage (Ve) divided by R 8) is applied, so the output side of the comparator (COM 2) has at the output of the synchronization separating circuit (1) as shown in the fourth degree (e) From the time the vertical synchronization signal output is the output the reference signal is input to the drum Motor control system (2).
한편 상기에서 수직동기신호가 출력되는 위치를 가변시킬 경우에는 검출레벨 선택신호 입력단자(A)에 일정전압을 인가하여 트랜지스터(TR1)의 베이스에 일정바이어스 전압을 인가하면, 트랜지스터(TR1)의 콜텍터전류는 그의 베이스에 인가된 바이어스 전압의 크기에 따라 일정하게 흐르면서 저항(R9)에 전압강하가 발생하게 되고, 비교기 (COM2)의 반전입력단자(-)에 인가된 기준전압(Ve)이 가변되므로 비교기(COM2)의 출력측에서 출력되는 기준신호의 위치가 조절되어 기준신호는 정확히 검출된다.On the other hand, in the case where the position where the vertical synchronization signal is outputted is changed, when a constant bias voltage is applied to the base of the transistor TR 1 by applying a constant voltage to the detection level selection signal input terminal A, the transistor TR 1 . The voltage of the collector current of the constant current flows in accordance with the magnitude of the bias voltage applied to its base, and a voltage drop occurs in the resistor R 9 , and the reference voltage applied to the inverting input terminal (-) of the comparator (COM 2 ) Since Ve) is variable, the position of the reference signal output from the output side of the comparator COM 2 is adjusted to accurately detect the reference signal.
이상에서 설명한 바와 같이 본 고안은 기준신호를 정확히 검출하여 드럼모우터의 회전속도를 정확히 제어하므로 수직동기신호를 비디오 테이프의 일정위치에 정확히 기록시킬 수 있어 재생화면의 깨끗하고, 별도의 조작으로 수직동기신호의 위치를 변경시켜도 기준신호는 정확히 검출할 수 있는 효과가 있다.As described above, the present invention accurately detects the reference signal and precisely controls the rotation speed of the drum motor, so that the vertical synchronization signal can be accurately recorded at a predetermined position on the video tape. Even if the position of the synchronization signal is changed, the reference signal can be detected accurately.
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| Application Number | Priority Date | Filing Date | Title |
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| KR2019850013790U KR890000780Y1 (en) | 1985-10-21 | 1985-10-21 | Reference signal detecting circuit of video tape recorder |
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| Application Number | Priority Date | Filing Date | Title |
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| KR2019850013790U KR890000780Y1 (en) | 1985-10-21 | 1985-10-21 | Reference signal detecting circuit of video tape recorder |
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| KR870007301U KR870007301U (en) | 1987-05-11 |
| KR890000780Y1 true KR890000780Y1 (en) | 1989-03-25 |
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| KR20210119103A (en) * | 2020-03-24 | 2021-10-05 | 디판 주식회사 | Steam oven cleaning system |
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