KR890003679Y1 - Tracking device of image record reproducer - Google Patents
Tracking device of image record reproducer Download PDFInfo
- Publication number
- KR890003679Y1 KR890003679Y1 KR2019850014549U KR850014549U KR890003679Y1 KR 890003679 Y1 KR890003679 Y1 KR 890003679Y1 KR 2019850014549 U KR2019850014549 U KR 2019850014549U KR 850014549 U KR850014549 U KR 850014549U KR 890003679 Y1 KR890003679 Y1 KR 890003679Y1
- Authority
- KR
- South Korea
- Prior art keywords
- tracking
- transistor
- terminal
- tracking device
- input terminal
- Prior art date
Links
Classifications
-
- 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
-
- 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
- G11B2005/0002—Special dispositions or recording techniques
- G11B2005/0005—Arrangements, methods or circuits
- G11B2005/001—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure
- G11B2005/0013—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure of transducers, e.g. linearisation, equalisation
- G11B2005/0016—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure of transducers, e.g. linearisation, equalisation of magnetoresistive transducers
- G11B2005/0018—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure of transducers, e.g. linearisation, equalisation of magnetoresistive transducers by current biasing control or regulation
Landscapes
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Abstract
내용 없음.No content.
Description
제1도는 종래의 트래킹 장치의 회로도.1 is a circuit diagram of a conventional tracking device.
제2도는 제1도 각 부의 파형도.2 is a waveform diagram of each part of FIG.
제3도는 본 고안 트래킹 장치의 회로도.3 is a circuit diagram of a tracking device of the present invention.
제4도는 제3도 각 부의 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 : 트래킹 모노밀러 2 : 클럭신호발생기1: Tracking Mono Mirror 2: Clock Signal Generator
3 : 업 다운 카운터 4 : 파형 정형기3: up-down counter 4: waveform shaper
5 : 초기값 설정기 6 : 디지탈/아날로그 콘버터5: Initial value setter 6: Digital / analog converter
TR1,TR2: 트랜지스터 C1: 콘덴서TR 1 , TR 2 : Transistor C 1 : Capacitor
R1~R4: 저항R 1 to R 4 : Resistance
본 고안은 비디오 테이프에 영상신호를 녹화 및 재생하는 영상녹화 재생기에 있어서, 영상헤드가 비디오 테이프에 영상신호를 녹화한 트랙을 재생시 정확히 트래킹하여 깨끗한 재생신호를 얻을 수 있게한 영상녹화 재생기의 트래킹 장치에 관한 것이다.The present invention provides a video recording player for recording and playing back a video signal on a video tape, wherein the video head accurately tracks a video recording track on a video tape so that a clear playback signal can be obtained. Relates to a device.
일반적으로 영상녹화 재생기는 비디오 테이프에 녹화된 영상신호를 재생할 경우에 영상헤드가 비디오 테이프의 트랙을 트래킹하면서 영상신호를 녹화한 부위를 정확히 트래킹하여야 깨끗한 재생영상신호가 출력되어 화면에 잡음신호가 나타나지 않게 된다.In general, when a video recorder plays back a video signal recorded on a videotape, the video head should track the track of the videotape and accurately track the area where the video signal is recorded. Will not.
따라서, 종래에는 영상신호를 녹화할때 비디어 테이프의 제어트랙에 제어신호를 기록하고, 재생시에는 그 기록된 제어신호를 재생시키고, 트래킹 장치로 일정시간 지연시킨 후 모우터의 회전 속도를 제어하는 서어보 회로에 입력시켜 영상헤드가 녹화시 트래킹한 트랙을 재생시 정확히 트래킹하게 제어하였다.Therefore, in the related art, a control signal is recorded on a control track of a video tape when recording a video signal, and when the playback is performed, the recorded control signal is reproduced, and a delay is fixed for a time by a tracking device to control the rotation speed of the motor. The input was input to the servo circuit so that the video head tracks exactly the track tracked during recording.
즉, 종래의 트래킹장치는 제1도의 도시한 바와같이 전원단자(Vcc)에 접속된 가변저항(VR1)을 SP(Standard Playing)및 EP(Extended Playing), LP(Long Playing) 모우드 단자(S)(E)(L)가 제어단자에 접속된 전자스위치(SW1)(SW2)(SW3) 및 가변저항(VR2)(VR3)(VR4)을 통하고, 저항(R1)을 통해 콘덴서(C1)에 접속함과 동시에 그 접속점을 제어신호 입력단자(CTL)가 제어단자(CL)에 접속된 트래킹 모노멀티(1)의 입력단자(IN)에 접속하여 구성하였다.That is, in the conventional tracking device, as shown in FIG. 1 , the variable resistor VR 1 connected to the power supply terminal Vcc is connected to the SP (Standard Playing), EP (Extended Playing), and LP (Long Playing) mode terminals (S). ) (e) (L) is an electronic switch connected to a control terminal (SW 1) (SW 2) (SW 3) and a variable resistor (VR 2) (VR 3) ( via the VR 4) and resistance (R 1 Is connected to the condenser C 1 at the same time, and the connection point is connected to the input terminal IN of the tracking monomulti 1 connected with the control signal input terminal CTL to the control terminal CL.
이와같이 구성된 종래의 트래킹 장치는 SP 또는 EP,LP모우드에 따라 전자스위치(SW1) 또는 (SW2)(SW3)가 단락되고, 제2도의 (a)에 도시한 바와같이 비디오 테이프에서 재생된 제어신호가 제어신호 입력단자(CTL)에 입력되면, 트래킹 모노멀티(1)는 그의 입력단자(IN)를 차단시켜 전원단자(Vcc)의 전원이 가변저항(VR1)을 통하고, 전자스위치(SW1) 및 가변저항(VR2) 또는 (SW2)(VR3),(SW3)(VR4)을 통해 제2도의 (b)에 도시한 바와같이 콘덴서(C1)에 충전되기 시작하고, 콘덴서(C1)에 충전된 전압이 모노멀티(1)의 드레시홀드 전압 이상이 되면 콘덴서(C1)에 충전된 전압은 트래킹 모노멀티(1)의 입력단자(IN)로 순식간에 방전되면서 제2도의 (c)에 도시한 바와같이 트래킹 모노멀티(1)의 출력단자에 펄스신호가 출력되어 서어보 회로에 입력되었다.In the conventional tracking device configured as described above, the electronic switches SW 1 or SW 2 and SW 3 are shorted according to the SP, EP, and LP modes, and reproduced on the video tape as shown in FIG. When the control signal is input to the control signal input terminal CTL, the tracking monomulti 1 blocks its input terminal IN so that the power supply of the power supply terminal Vcc passes through the variable resistor VR 1 , and the electronic switch. Through the (SW 1 ) and the variable resistor (VR 2 ) or (SW 2 ) (VR 3 ), (SW 3 ) (VR 4 ), the capacitor C 1 is charged as shown in (b) of FIG. 2. in an instant to the beginning, and the capacitor (C 1) an input terminal (iN) of when the threshold voltage or more of the charged voltage is mono-multi-1, the voltage charged in the capacitor (C 1) is a tracking mono multi (1) to As it is discharged, a pulse signal is output to the output terminal of the tracking monomulti 1 as shown in Fig. 2C and input to the servo circuit.
그러나, 이와같은 종래의 트래킹 장치는 트래킹을 조절할 경우에 사용자가 일일이 가변저항(VR2~VR4)을 조절하여 콘덴서(C1)의 충전 시정수를 가변해야 되므로 트래킹 조절에 많은 번거로움이 있음은 물론 영상 녹화 재생기를 원격 제어할 경우에 트래킹 조절은 원격 제어할 수 없는 결함이 있었다.However, in the conventional tracking device, when the tracking is adjusted, the user has to adjust the variable resistance (VR 2 to VR 4 ) one by one to change the charging time constant of the condenser (C 1 ). Of course, in case of remote control of video recording player, tracking control has a defect that cannot be controlled remotely.
본 고안은 이와같은 종래의 결함은 감안하여, 카운터의 카운트에 따라 트랜지스터의 바이어스 전압을 가변하여 콘덴서의 충전 시정수를 가변함으로써 간단히 트래킹을 조절할 수 있게 함은 물론 원격 제어로도 조절할 수 있게 안출한 것으로, 이를 첨부된 제3도 및 제4도의 도면에 의하여 상세히 설명하면 다음과 같다.In view of the above-mentioned deficiencies, the present invention can adjust the bias voltage of the transistor according to the counter count, thereby changing the charging time constant of the capacitor, thereby making it possible to easily adjust tracking as well as remote control. If this is described in detail with reference to the accompanying drawings 3 and 4 as follows.
제3도는 본 고안 트래킹 장치의 회로도로서 이에 도시한 바와같이 SP 및 EP,LP모우드 단자(S)(E)(L)가 제어단자에 접속된 전자스위치(SW1)(SW2)(SW3)를 가변저항(VR2)(VR3)(VR4)을 통하고, 저항(R1)을 통해 콘덴서(C1)및 트래킹 모노멀티(1)의 입력단자(IN)에 접속한 트래킹 장치에 있어서, 클럭신호 발생기(2)의 출력기 (CLK)를 가산 및 감산스위치(SW4)(SW5)를 각기 통해 업 다운 카운터(3)의 가산 및 감산단자(UP)(DO)에 접속하고, 입력단자에는 입력단자가 재생 신호단자(PH)에 접속된 파형 정형기(4)의 출력단자를 초기값 설정기(5)를 통해 접속하여 그의 출력단자를 디지탈/아날로그 콘버터(6) 및 저항(R2)을 통해 저항(R3) 및 가변저항(VR5), 트랜지스터(TR1)의 베이스에 접속하며, 트랜지스터(TR1)의 에미터는 저항(R4)및 트랜지스터(TR2)의 베이스에 접속하여 트랜지스터(TR2)의 에미터 및 콜렉터를 상기 저항(R1)과 콘덴서(C1)및 트래킹 모노멀티(1)의 입력단자(IN)의 접속점 사이에 접속한 것으로, 상기에서 재생신호단자(PH)는 재생시 고전위가 입력되게 한다.3 is a circuit diagram of a tracking device of the present invention, as shown in FIG. 3, an electronic switch SW 1 (SW 2 ) (SW 3 ) having SP, EP, LP mode terminals S, E, and L connected to a control terminal. ) Is connected to the input terminal (IN) of the condenser (C 1 ) and the tracking mono-multi (1) through the variable resistor (VR 2 ) (VR 3 ) (VR 4 ) and through the resistor (R 1 ). Is connected to the addition and subtraction terminals UP and DO of the up-down counter 3 through the addition and subtraction switches SW 4 and SW 5 of the clock signal generator 2, respectively. The input terminal is connected to the output terminal of the waveform shaper 4 in which the input terminal is connected to the reproduction signal terminal PH through the initial value setter 5, and the output terminal thereof is connected to the digital / analog converter 6 and the resistor ( R 2 ) is connected to the resistor R 3 , variable resistor VR 5 , and the base of transistor TR 1 , and the emitter of transistor TR 1 is the base of resistor R 4 and transistor TR 2 . By accessing Transistor emitter and the resistor the collector of the (TR 2) (R 1) and a capacitor (C 1), and that connected between the connection point of the input terminal (IN) of the tracking mono multi (1), the reproduced signal terminals in the (PH) allows high potential to be input during playback.
이와같이 구성된 본 고안의 작용효과를 상세히 설명하면 다음과 같다.Referring to the effects of the present invention configured in this way in detail as follows.
전원단자(Vcc)에 전원이 인가되고, 영상녹화 재생기의 재생버튼을 누르면, 재생 신호단자(PH)에 고전위가 입력되어 파형정형기(4)에 인가되므로 파형정형기(4)는 일정수의 펄스신호를 출력시켜 초기값 설정기(5)에 입력되고, 이에따라 초기값 설정기(5)는 업다운 카운터(3)에 일정값을 일력시키게 되므로 업다운 카운터(3)는 일정값을 출력시켜 디지탈/아날로그 콘버터(6)의 출력측에는 제2도의 (a)에 도시한 바와같이 일정전압이 출력되고, 그 출력된 전압은 저항(R2)을 통해 트랜지스터(TR1)의 베이스에 인가되어 그의 콜렉터에서 에미터로 일정 전류가 흐르면서 트랜지스터(TR2)의 베이스에 일정 바이어스 전압이 인가된다.When power is applied to the power supply terminal Vcc and the play button of the video recording / reproducing device is pressed, a high potential is input to the reproducing signal terminal PH and applied to the waveform shaper 4, so that the waveform shaper 4 has a predetermined number of pulses. A signal is output and input to the initial value setter 5, and accordingly, the initial value setter 5 writes a constant value to the up-down counter 3, so the up-down counter 3 outputs a constant value to digital / analog. On the output side of the converter 6, a constant voltage is output as shown in Fig. 2A, and the output voltage is applied to the base of the transistor TR 1 through the resistor R 2 , and the emitter at the collector thereof. A constant bias voltage is applied to the base of the transistor TR 2 while a constant current flows through the gate.
여기서, SP모우드를 선태하면 SP모우드 단자(S)가 제어단자에 접속된 전자스위치(SW1)가 단락되고, 제2도의 (b)에 도시한 바와같이 시간(t1)에 제어신호 입력단자(CTL)에 제어신호가 입력되면, 트래킹 모노멀티(1)는 그의 입력단자(IN)를 차단시켜 전원단자(Vcc)의 전원이 전자스위치(SW1) 및 가변저항(VR2), 저항(R1)을 통하고, 트랜지스터(TR2)의 베이스에 인가된 바이어스 전압에 따라 트랜지스터(TR2)를 통해 제2도의 (c)에 도시한 바와같이 콘덴서(C1)에 충전되기 시작하고, 콘덴서(C1)에 충전된 전압이 트래킹 모노멀티(1)의 드레시 홀드 전압 이상이 되면, 콘덴서(C1)에 충전된 전압은 트래킹 모노멀티(1)의 입력단자(IN)로 방전되므로 트래킹 모노멀티(1)의 출력단자에는 제2도의 (d)에 도시한 바와같이 제어신호가 입력되는 시간부터 일정시간(T1) 지연된 후 펄스신호가 출력되어 서어보 회로에 입력된다.Here, when the SP mode is selected, the electronic switch SW 1 having the SP mode terminal S connected to the control terminal is short-circuited, and the control signal input terminal is time t 1 as shown in (b) of FIG. When the control signal is input to the CTL, the tracking monomulti 1 blocks its input terminal IN so that the power supply of the power supply terminal Vcc is switched to the electronic switch SW 1 , the variable resistor VR 2 , and the resistance ( Through R 1 ) and through the transistor TR 2 according to the bias voltage applied to the base of the transistor TR 2 and starts to charge the capacitor C 1 as shown in FIG. When the capacitor (C 1), the voltage is the threshold voltage or more of the tracking mono-multi (1) filled in, the voltage charged in the capacitor (C 1) is so discharged by the input terminal (iN) of the tracking mono multi (1) tracking mono-multi (1) output terminal, as shown in the second degree (d) the control signal is delayed from the time at which input a predetermined time (T 1) of Is a pulse signal output is input to the Servo circuit.
이와같은 상태에서 비디오 테이프 레코오더의 트래킹 상태가 나빠 트래킹 모노멀티(1)의 출력측에 출력되는 펄스신호의 지연시간을 느리게할 경우에 시간(t2)에 가산스위치(SW4)를 단락시키면, 그 단락에 따라 클럭신호 발생기(2)에서 출력된 클럭신호가 가산스위치(SW4)를 통해 업다운 카운터(3)의 가산단자(UP)에 입력되어 그의 카운트 값이 증가하게 되므로 디지탈/아날로그 콘버터(6)의 출력측에는 상기에서 보다 높은 전압이 출력되어 트랜지스터(TR1)의 베이스에 인가되고, 이에따라 트랜지스터(TR2)의 베이스에 인가되는 전압이 상기에서 보다 높아지므로 트랜지스터(TR2)의 에미터에서 베이스로 흐르는 전류가 작아져 제어신호가 입력되는 시간(t3)에 콘덴서(C1)에는 상기에서 보다 전원단자(Vcc)의 전원이 천천이 충전되고, 트래킹 모노멀티(1)에서 출력되는 펄스신호의 지연시간(T2)는 상기에서 보다 늦어지게 된다.In such a state, when the tracking state of the video tape recorder is poor and the delay time of the pulse signal outputted to the output side of the tracking monomulti is slowed, shorting the addition switch SW 4 at time t 2 , According to the short circuit, the clock signal output from the clock signal generator 2 is input to the addition terminal UP of the up-down counter 3 through the addition switch SW 4 , and the count value thereof is increased so that the digital / analog converter ( On the output side of 6), a higher voltage is output above and applied to the base of the transistor TR 1 , and accordingly the voltage applied to the base of the transistor TR 2 becomes higher than above, so that the emitter of the transistor TR 2 is higher. At the time t 3 when the current flowing from the base to the base becomes small and the control signal is inputted, the capacitor C 1 is slowly charged with the power of the power supply terminal Vcc than the above, and the tracking monomulti 1 The delay time T 2 of the pulse signal outputted from the signal becomes later than above.
그리고 트래킹 모노멀티(1)에서 출력되는 펄스신호의 지연시간을 빠르게 할 경우에는 시간(t4)에 감산 스위치(SW5)를 단락시키면, 업다운 카운터(3)의 카운트 값이 감소하여 디지탈/아날로그 콘버터(6)의 출력전압이 낮아지게 되므로 트랜지스터(TR1)의 베이스에 인가되는 전압이 낮아져 트랜지스터(TR2)의 베이스에 인가되는 전압이 낮아지고, 이에따라 트랜지스터(TR2)의 바이어스 전압이 높아져 그의 에미터에 콜렉터로 흐르는 전류가 상기에서 보다 많아지게 되므로 제어신호가 입력되는 시간(t5)에 콘덴서(C1)에는 전원단자(Vcc)의 전원이 빠른 속도로 충전되어 트래킹 모노멀티(1)에서 출력되는 펄스신호의 지여시간(T3)은 빨라지게 된다.In order to increase the delay time of the pulse signal output from the tracking mono-multi (1), shorting the subtraction switch (SW 5 ) at time (t 4 ), the count value of the up-down counter (3) is reduced to digital / analog Since the output voltage of the converter 6 is lowered, the voltage applied to the base of the transistor TR 1 is lowered, thereby lowering the voltage applied to the base of the transistor TR 2 , and accordingly, the bias voltage of the transistor TR 2 is increased. Since the current flowing through the collector to the emitter becomes larger than the above, the capacitor C 1 is charged at a high speed to the condenser C 1 at a time t 5 when the control signal is inputted, so that the tracking monomulti The supporting time (T 3 ) of the pulse signal outputted from the F1) becomes faster.
한편, 상기에서 EP 또는 LP모우드로 재생할 경우에는 EP 또는 LP모우드 단자(E)(L)에 고전위가 입력되어 전자스위치(SW2) 또는 (SW3)가 단락되므로 전원단자(Vcc)의 전원은 전자스위치(SW2) 및 가변저항(VR3) 또는 전자스위치(SW3) 및 가변저항(VR4)을 통한 후 저항(R1), 트랜지스터(TR2)를 통해 콘덴서(C1)에 충전되면서 트래킹 모노멀티(1)를 제어하게 된다.On the other hand, in the case of reproducing with the EP or LP mode in the above, the high potential is input to the EP or LP mode terminal (E) (L), so that the electronic switch (SW 2 ) or (SW 3 ) is short-circuited Through the electronic switch (SW 2 ) and the variable resistor (VR 3 ) or through the electronic switch (SW 3 ) and the variable resistor (VR 4 ) to the capacitor (C 1 ) through the resistor (R 1 ), transistor (TR 2 ). While charging, the tracking monomulti will be controlled 1.
이상에서 설명한 바와같이 본 고안은 가산 및 감산스위치(SW4)(SW5)의 단락에 따라 트랜지스터(TR2)의 바이어스 전압을 가변하여 트래킹 모노멀티(1)의 출력 펄스신호의 지연시간을 가변하는 것으로 사용자가 간단히 트래킹을 조정할 수 있음은 물론 원격제어로 스위치(SW4)(SW5)를 단락시키게 하면 영상녹화 재생기의 트래킹 조정도 원격제어할 수 있는 효과가 있다.As described above, the present invention varies the delay time of the output pulse signal of the tracking monomulti 1 by varying the bias voltage of the transistor TR 2 according to the short-circuit of the addition and subtraction switches SW 4 and SW 5 . In addition, the user can easily adjust the tracking, and if the switch SW 4 or SW 5 is shorted by the remote control, the tracking control of the video recording player can be controlled remotely.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019850014549U KR890003679Y1 (en) | 1985-11-04 | 1985-11-04 | Tracking device of image record reproducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019850014549U KR890003679Y1 (en) | 1985-11-04 | 1985-11-04 | Tracking device of image record reproducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR870008885U KR870008885U (en) | 1987-06-13 |
| KR890003679Y1 true KR890003679Y1 (en) | 1989-05-31 |
Family
ID=19246290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019850014549U KR890003679Y1 (en) | 1985-11-04 | 1985-11-04 | Tracking device of image record reproducer |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR890003679Y1 (en) |
-
1985
- 1985-11-04 KR KR2019850014549U patent/KR890003679Y1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR870008885U (en) | 1987-06-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4490755A (en) | Recording and reproducing video signals at selectable different tape traveling speeds from plural video head pairs | |
| KR890003679Y1 (en) | Tracking device of image record reproducer | |
| JPH022216B2 (en) | ||
| US4941058A (en) | Data signal recording/reproduction apparatus of a VCR | |
| JPH0531700Y2 (en) | ||
| KR870000985Y1 (en) | Recording adjustment device of video tape recorder | |
| KR920009099B1 (en) | Tacho pulse generating circuit | |
| KR900008391Y1 (en) | Automatic tracking circuit in video signal displayer | |
| US6141171A (en) | Cue signal detection circuit of magnetic recording and reproducing device | |
| JPH0333945Y2 (en) | ||
| KR910000093Y1 (en) | Control signal record/play circuit | |
| JPS6116057A (en) | Information signal reproducer | |
| KR910002996Y1 (en) | Level synchronizing signal detecting circuit for digital audio tape recorder | |
| KR860001842B1 (en) | Rotating head and control circuit for video tape recorder | |
| JPS6346498B2 (en) | ||
| KR0128055B1 (en) | Autometic selecting method and apparatus for tape record player | |
| KR930001113Y1 (en) | Tracking freeset circuit | |
| KR870000047B1 (en) | Control signal record and reproducting system of video tape recorder | |
| KR900002631Y1 (en) | Testing circuit of reproducing state of video cassette recorder | |
| KR880002415Y1 (en) | Reservation circuit of a video tape recorder | |
| KR900008855Y1 (en) | Double deck reproducing control apparatus | |
| KR930002832Y1 (en) | Control pulse recording and reproducing circuit for vtr | |
| KR930003978Y1 (en) | Index circuit of a program for voice in vtr | |
| JPS59117747A (en) | Magnetic recording and reproducing device | |
| JPS6319966Y2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E701 | Decision to grant or registration of patent right | ||
| REGI | Registration of establishment | ||
| FPAY | Annual fee payment |
Payment date: 19981221 Year of fee payment: 11 |
|
| LAPS | Lapse due to unpaid annual fee |