KR900005141Y1 - Tracking pilot system of vcr - Google Patents

Tracking pilot system of vcr Download PDF

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Publication number
KR900005141Y1
KR900005141Y1 KR2019860012062U KR860012062U KR900005141Y1 KR 900005141 Y1 KR900005141 Y1 KR 900005141Y1 KR 2019860012062 U KR2019860012062 U KR 2019860012062U KR 860012062 U KR860012062 U KR 860012062U KR 900005141 Y1 KR900005141 Y1 KR 900005141Y1
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South Korea
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maximum value
level
mode
unit
pass filter
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KR2019860012062U
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Korean (ko)
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KR880005198U (en
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김종화
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주식회사 금성사
구자학
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Priority to KR2019860012062U priority Critical patent/KR900005141Y1/en
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/10—Indicating arrangements; Warning arrangements
    • 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
    • G11B27/36—Monitoring, i.e. supervising the progress of recording or reproducing
    • 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
    • G11B5/488—Disposition of heads
    • G11B5/4893—Disposition of heads relative to moving tape
    • 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

Abstract

내용 없음.No content.

Description

VCR의 정트래킹 표시회로Positive tracking display circuit of VCR

제1도는 본 고안에 따른 정트래킹 표시회로.1 is a positive tracking display circuit according to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : RF입력단 2 : 최대치 검출부1: RF input terminal 2: Maximum value detector

3 : 비교부 4 : 모드 신호 입력단3: comparator 4: mode signal input terminal

5 : 미분 회로부 6 : 스위칭부5 differential circuit 6 switching unit

7 : 표시부 구동회로 LPF1,LPF2 : 저역통과 여파기7: Display unit driving circuit LPF1, LPF2: Low pass filter

R1-R9 : 저항 C1-C4 : 콘덴서R1-R9: Resistor C1-C4: Capacitor

D1,D2 : 다이오우드 LED1 : 발광다이오우드D1, D2: Diode LED1: LED

Vcc : 전원 Q1,Q2,Q3 : 트랜지스터Vcc: Power Q1, Q2, Q3: Transistor

본 고안은 비데오 테이프 레코더의 정확한 헤드 트레이스(Head Trace)를 표시해주는 정트래킹(Tracking) 표시회로에 관한 것으로 특히 마그네틱 테이프에 다수의 프로그램이 편집되거나 각 모드로 기록된 경우 각각의 모드마다 해당되는 적정 레벨을 감지하여 정트래킹 조정시 램프를 구동시켜 표시를 하도록한 비데오 테이프 레코더의 정트래킹 표시장치에 관한 것이다.The present invention relates to a constant tracking display circuit that displays the correct head trace of a video tape recorder. Especially, when a large number of programs are edited or recorded in each mode on a magnetic tape, the appropriate titration for each mode is appropriate. The present invention relates to a forward tracking display device of a video tape recorder which senses a level and drives a lamp to display a forward tracking adjustment.

종래의 수동식 트래킹 조절장치는 화면을 표면서 화면상태를 기준으로 하여 트래킹 조절을 하므로서 회로구성이 복잡하고 화면 모니터와 연결상태가 불량이거나 모니터 자체에 결함이 있어도 트래킹 조절이 잘못된 것으로 오인하여 조절을 계속하거나 그대로 시청하는 결함이 있었다.Conventional manual tracking control adjusts tracking based on the screen state of the screen, so that the circuit configuration is complicated, and even if the connection status with the screen monitor is poor or the monitor itself is defective, the tracking adjustment is mistaken to continue the adjustment. There was a flaw to watch as it is.

따라서 본 고안은 상기한 단점을 개선시킬 목적으로 회로 구성을 간단히 하고 각각의 모드마다 해당하는 적정 레벨을 감지하여 표시해주므로서 조정에 의한 불량상태를 즉시 감지하고 정확한 트래킹 조정을 하도록 하려는 것이다.Therefore, the present invention is intended to simplify the circuit configuration and to detect and display the appropriate level for each mode in order to remedy the above-mentioned disadvantages, so as to immediately detect a defective state caused by the adjustment and make accurate tracking adjustment.

본 고안에 따른 정트래킹 표시회로의 기술구성은 제1도에 도시된 바와같이 RF입력단(1)과 저역통과 여파기(LPF1,LPF2)와, 콘덴서(C4,C5) 및 다이오우드(D1,D2)로 구성된 최대치 검출부(2)와, 저항(R4,R5)과 레벨변환기(A1) 및 비교기(A2)로 구성된 비교부(3)와, SP모드단(SP) LP모드단(LP) 및 EP모드단(EP)으로 구성된 모드신호 입력단(4)과, 저항(R1,R2,R3)과 콘덴서(C1,C2,C3)로 구성된 미분회로부(5)와, 트랜지스터(Q1)와 저항(R10)으로 구성된 스위칭부(6)와, 저항(R6-R9)과 트랜지스터(Q2,Q3) 및 발광다이오우드(LED1)로 구성된 표시부 구동회로(7)를 각각 연결하여 트래킹 조정시 정확한 트래킹의 표시를 하도록 구성한 것으로 좀더 상세히 설명하면 다음과 같다.The technical configuration of the positive tracking display circuit according to the present invention consists of the RF input stage 1, the low pass filter LPF1, LPF2, the capacitors C4, C5, and the diodes D1, D2 as shown in FIG. Configured maximum detection unit 2, comparator 3 composed of resistors R4 and R5, level converter A1 and comparator A2, SP mode stage SP, LP mode stage LP and EP mode stage A mode signal input stage 4 composed of (EP), a differential circuit portion 5 composed of resistors R1, R2, R3 and capacitors C1, C2, C3, and a transistor Q1 and resistor R10. It is configured to display the accurate tracking during tracking adjustment by connecting the switching unit 6, the display unit driving circuit 7 composed of the resistors R6-R9, the transistors Q2 and Q3, and the light emitting diode LED1, respectively. It will be described in detail as follows.

RF입력단(1)은 저역통과 여파기(LPF1)에 연결되고, 저역통과 여파기(LPF1)는 다이오우드(D1)와 콘덴서(C4)와 다이오우드(D1)의 병렬 접속은 다이오우드(D2)를 통해 레벨 변환기(A1)의 입력(a)에 연결하고, SP모드단(SP)과 LP모드 입력단(LP) 및 LP모드 입력단(EP)은 저항(R1)(R2)(R3)과 콘덴서(C1)(C2)(C3)로 통해 트랜지스터(Q1)의 베이스에 공통으로 연결하고 트랜지스터(Q1)의 에미터는 접지접속하며, 그의 콜렉터는 저항(R10)을 통해 레벨 변환기(A1)의 입력(a)에 연결함과 동시에 콘덴서(C4)를 통해 접지접속되며, 상기 레벨 변환기(A1)의 입력(b)은 저항(R4)을 통해 전원(Vcc)이 인가되고 또한 저항(R5)을 통해 접지접속되며 그의 출력은 비교기(A2)의 입력(a)에 연결하고, 입력(b)에 저역통과 여파기(LPF2)가 연결된 상기 비교기(A2)의 출력은 저항(R6)을 통해 트랜지스터(Q2)의 베이스에 연결하고 트랜지스터(Q2)의 에미터는 접지접속하고 그의 콜렉터는 저항(R7)을 통해 전원(Vcc)이 인가되고 또한 저항(R9)을 통해 접지접속됨과 동시에 트랜지스터(Q3)의 베이스에 연결하고, 트랜지스터(Q3)의 콜렉터는 발광다이오우드(LED1)를 통해 접지접속되며 그의 에미터는 저항(R8)을 통해 전원(Vcc)이 인가된 구성이다. 이와같은 회로 구성에서 저역통과 여파기(LPF1)는 RF신호에서 고주파 신호를 제거하여 직류 레벨로 변환시키며 상기 저역통과 여파기(LPF1)의 출력은 최대치 감지를 위한 최대치 검출부(2)에 입력되는데, 이때 최대치 검출부(2)는 재생이 개시되거나 모드가 변환될때, 서보계의 안정시간까지 비데오 헤드의 콘트롤이 불안정할 경우 트래킹 조절에 관계없이 비데오 헤드의 최대치 순간적으로 보유하게되고 상기한 최대치는 최대치겸출부(2)에 기억된 상태에서 레벨 변환기(A1)의 입력(a)에 인가되며, 레벨 변환기(A1)의 입력(b)에는 저항(R4)과 (R5)에 의해 분배된 기준전압(Vref)인가된다. 따라서 최대치 검출부(2)의 콘덴서(C4)에 기억된 최대치는 레벨 변환기(A1)에서 적정레벨로 레벨변환되어 비교기(A2)의 입력(a)에 인가된다. 이때 저역통과 여파기(LPF2)에 의해 변환된 직류, 즉 현재의 재생 레벨은 비교기(A2)의 입력(b)에 인가되며, 비교기(A2)는 상기 레벨 변환기(A1)에서 적정레벨로 변환된 입력(a)과 저역통과 여파기(LPF2)에서 직류레벨로 변환된 재생레벨 입력(b)을 비교출력하여 저항(R6)을 통해 스위칭 트랜지스터(Q2)의 베이스에 인가되어 트랜지스터(Q2)를 스위칭시키므로 발광다이오우드(LED1)를 동작시킨다.The RF input stage 1 is connected to the low pass filter LPF1, and the low pass filter LPF1 is connected to the diode D1, the capacitor C4 and the diode D1 in parallel by the level converter D2. The SP mode stage SP, the LP mode input stage LP, and the LP mode input stage EP are resistors R1, R2, R3, and capacitor C1, C2. (C3) is commonly connected to the base of transistor Q1, the emitter of transistor Q1 is connected to ground, and its collector is connected to input a of level converter A1 through resistor R10. At the same time, it is connected to the ground through the capacitor C4, the input (b) of the level converter A1 is supplied with the power supply (Vcc) through the resistor (R4), and also through the resistor (R5), the output of the comparator The output of the comparator A2, which is connected to the input (a) of (A2) and the lowpass filter (LPF2) connected to the input (b), is connected to the base of the transistor (Q2) via a resistor (R6). The emitter of transistor Q2 is connected to ground and its collector is connected to the base of transistor Q3 at the same time that the power supply Vcc is applied through resistor R7 and is connected to ground through resistor R9. The collector of Q3) is connected to the ground via the light emitting diode LED1, and its emitter is configured such that the power supply Vcc is applied through the resistor R8. In this circuit configuration, the low pass filter LPF1 removes the high frequency signal from the RF signal and converts the signal into a DC level, and the output of the low pass filter LPF1 is input to the maximum value detector 2 for detecting the maximum value. The detection unit 2 temporarily retains the maximum value of the video head irrespective of the tracking adjustment when the playback of the video head is unstable until the stability time of the servo system when the playback is started or the mode is changed. It is applied to the input a of the level converter A1 in the state stored in 2), and the reference voltage Vref distributed by the resistors R4 and R5 is applied to the input b of the level converter A1. do. Therefore, the maximum value stored in the condenser C4 of the maximum value detector 2 is level-converted to the appropriate level by the level converter A1 and applied to the input a of the comparator A2. At this time, the direct current converted by the lowpass filter LPF2, that is, the current regeneration level is applied to the input b of the comparator A2, and the comparator A2 is converted to the appropriate level by the level converter A1. (a) and the regenerative level input (b) converted from the low pass filter (LPF2) to the DC level are compared and output and applied to the base of the switching transistor (Q2) through the resistor (R6) to switch the transistor (Q2) to emit light. Operate diode (LED1).

즉 재생이 시작된후 비교기(A2)의 입력단(b)에 인가된 재생레벨이 입력(a)에 인가된 기준 레벨보다 낮을 경우 비교기(A2)는 출력이 "하이"전위가 되어 트랜지스터(Q2)은 온(ON)되고 이에따라 트랜지스터(Q3)가 온되어 발광다이오우드(LED1)는 점등된다.That is, if the regeneration level applied to the input terminal b of the comparator A2 is lower than the reference level applied to the input a after the start of regeneration, the comparator A2 becomes the "high" potential and the transistor Q2 The LED Q1 is turned on by turning ON the transistor Q3.

이때 VCR재생시 모드가 변화되거나, 동일 모드라도 기록상태가 다른 경우 저항(R1)과 콘덴서(C1), 저항(R2)과 콘덴서(C2), 저항(R3)과, 콘덴서(C3)의 미분 회로부(5)에 의한 미분 파형이 트랜지스터(Q1)를 스위칭시켜 콘덴서(C4)에 기억되어 있는 전번 모드의 최대치를 방전시켜 동시에 최대치를 재설정하여 드럼 및 캡스턴 서보계의 안정시까지의 홀딩(Holding)하므로 모두 변환에 따른 기준 레벨이 설정된다.At this time, if the mode is changed during the VCR playback or the recording state is different even in the same mode, the differential circuit portion of the resistor R1 and the capacitor C1, the resistor R2 and the capacitor C2, the resistor R3 and the capacitor C3 is used. The differential waveform by (5) switches the transistor Q1 to discharge the maximum value of the previous mode stored in the capacitor C4, reset the maximum value at the same time, and hold the drum and the capstan servo system until stability. Both reference levels are set according to the conversion.

따라서 본 고안에 따른 정트래킹 표시회로는 재생시 최적의 트래킹 조절을 위해 정트래킹이 흐트러진 경우 이를 감지하여 사용자에 표시하므로 정확한 트래킹 조정이 가능하고 트래킹을 오 조정한 경우에 발생되는 불량상태를 즉시 감지할 수 있는 장점이 있다.Therefore, the positive tracking display circuit according to the present invention detects when the positive tracking is disturbed and displays it to the user for optimal tracking control during playback, so that accurate tracking adjustment is possible and immediately detects a bad state caused by incorrect tracking. There is an advantage to this.

Claims (1)

저역통과 여파기(LPF1)에서 고주파 신호가 제거된 직류레벨의 RF신호로부터 최대치를 검출하여 저장하는 최대치 검출부(2)와, 재생이 개시되거나 모드가 변환될때 미분회로부(5)를 통해 입력된 모드신호(SP,LP,EP)에 의해 상기 최대치 검출부(2)에 저장된 최대치를 방전시켜 모드에 따른 최대치를 재설정토록하는 스윙부(6)와, 기준전압(Vref)에 의해 상기 최대치 검출부(2)에 저장된 최대치를 적정레벨로 변환하여 저역통과 여파기(LPF2)에서 출력되는 현재의 재생레벨을 비교출력하는 비교부(3)와, 재생레벨이 기준레벨보다 적을때 상기 비교부(3)의 출력에 의해 동작하여 정트래킹이 흐트러진 경우를 표시하는 표시부 구동회로(7)를 포함하여 구성된 것을 특징으로 하는 VCR의 정트랙킹 표시회로.The maximum value detector 2 detects and stores the maximum value from the RF signal of the DC level from which the high frequency signal has been removed from the low pass filter LPF1, and the mode signal inputted through the differential circuit unit 5 when regeneration is started or the mode is switched. The swing unit 6 discharges the maximum value stored in the maximum value detection unit 2 by SP, LP, and EP so as to reset the maximum value according to the mode, and the maximum value detection unit 2 by the reference voltage Vref. A comparison unit 3 for converting the maximum stored value into an appropriate level to compare and output the current reproduction level output from the low pass filter LPF2, and outputting the comparison unit 3 when the reproduction level is less than the reference level. And a display unit driver circuit (7) which displays a case in which the positive tracking is disturbed by operation.
KR2019860012062U 1986-08-11 1986-08-11 Tracking pilot system of vcr KR900005141Y1 (en)

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KR2019860012062U KR900005141Y1 (en) 1986-08-11 1986-08-11 Tracking pilot system of vcr

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KR880005198U KR880005198U (en) 1988-05-11
KR900005141Y1 true KR900005141Y1 (en) 1990-06-09

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