KR930001595Y1 - Auto-tracking fine circuit using pilot signal - Google Patents
Auto-tracking fine circuit using pilot signal Download PDFInfo
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- KR930001595Y1 KR930001595Y1 KR2019870022451U KR870022451U KR930001595Y1 KR 930001595 Y1 KR930001595 Y1 KR 930001595Y1 KR 2019870022451 U KR2019870022451 U KR 2019870022451U KR 870022451 U KR870022451 U KR 870022451U KR 930001595 Y1 KR930001595 Y1 KR 930001595Y1
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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
- G11B5/588—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 by controlling the position of the rotating heads
- G11B5/592—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 by controlling the position of the rotating heads using bimorph elements supporting the heads
- G11B5/5921—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 by controlling the position of the rotating heads using bimorph elements supporting the heads using auxiliary signals, e.g. pilot signals
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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
- G11B5/008—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
Abstract
내용 없음.No content.
Description
제1도는, 종래의 VTR에서 사용되는 트랙 상태도.1 is a track state diagram used in a conventional VTR.
제2도는, 본 고안의 VTR에서 사용되는 트랙 상태도.2 is a track state diagram used in the VTR of the present invention.
제3도는, 종래의 회로도.3 is a conventional circuit diagram.
제4도는, 본 고안의 회로도.4 is a circuit diagram of the present invention.
제5도는, 본 고안의 회로도의 각부에 나타나는 파형도.5 is a waveform diagram that appears in each part of the circuit diagram of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 주파수 발생기 2 : 믹서1: frequency generator 2: mixer
3 : 프로세서 4 : 47KHz BPF3: processor 4: 47KHz BPF
5 : 16KHz BPF 6 : 차동증폭기5: 16KHz BPF 6: Differential Amplifier
7,8 : 샘플 앤드 홀드(Sample and Hold) 회로 9 : f1밴드 패스필터(BPF)7,8: sample and hold circuit 9: f 1 band pass filter (BPF)
10 : f2밴드 패스필터(BPF) 11,12 : 적분기10: f 2 band pass filter (BPF) 11, 12: integrator
I1, I2: 인버터 B1B2: 버퍼I 1 , I 2 : Inverter B 1 B 2 : Buffer
PB : 재생앰프 H : 헤드PB: Reproduction Amplifier H: Head
본 고안은 비디오 테이프 레코오더(VTR)에서 2개의 주파수를 파이로트(Pilot)신호로 헤드에 기록여 재생시에는 그 두개의 신호를 검출하는 것에 의하여 트랙을 추적할 수 있도록 한 자동 트랙킹 확인(Auto Tracking Fine)(이하 ATF라 약칭함)회로에 관한 것이다.The present invention records two frequencies in a video tape recorder (VTR) as a pilot signal on the head, and during playback, tracks can be tracked by detecting the two signals. Fine) (hereinafter abbreviated as ATF) circuit.
종래의 이러한 회로의 종류로서는, 제3도에 도시한 바와 같이 동기 입력신호(SW30)(SW15)는 주파수 발생기(1)에 가해지도록 접속되고, 그의 출력단은 믹서(2)를 통하여 헤드(H)에 접속되고, 헤드(H)의 출력신호는 재생앰프(PB) 및 프로세서(3)를 통하여 2개의 밴드 패스필터(4), (5) 및 (B1), (B3)를 거쳐 차동증폭기(6)에 접속되고, 사이 차동증폭기(6)의 출력단은 샘플 앤드 홀드 회로(7), (8)를 통하여, 콘트롤 신호가 출력되도록 연결구성되어 있으며, 그의 회로 동작관계는 동기신호(SW30)(SW15)가 입력되는 주파수발생기(1)에서 제1도에서와 같이 파이로트 신호(f1), (f2), (f3), (f4)를 믹서(2)로서 회로 신호와 색신호를 혼합하여 기록하도록 되어 있다.As a conventional type of such a circuit, as shown in FIG. 3, the synchronous input signals SW30 (SW15) are connected to be applied to the frequency generator 1, and their output stages are connected to the head H through the mixer 2. And the output signal of the head H is passed through two band pass filters 4, 5, and B 1 , B 3 through the reproducing amplifier PB and the processor 3. The output terminal of the differential amplifier 6 is connected to (6), and is configured such that a control signal is outputted through the sample and hold circuits (7) and (8), and the circuit operation relation thereof is a synchronization signal (SW30). In the frequency generator 1 to which (SW15) is input, the pilot signals f 1 , f 2 , f 3 , and f 4 are used as the mixer 2 as shown in FIG. It is to mix and record.
그리고 재생시에는 헤드(H)로부터 재생된 신호가 재생앰프(PB)를 통하여 인접주파수와 감산하여 출력시키고, 이 신호는 2개의 47KHz, 16KHz 밴드 패스필터(4), (5)를 각각 통한 출력이 차동증폭기(6)의 비반전(+)입력단자와 반전(-)입력단자에 가해지며, 그의 출력단 신호는 좌, 우측 인접의 어느 트랙측에 더 치우쳐 있는가를 판별하며, 이 신호가 테이프의 속도를 제어함으로써 헤드(H)가 본래의 트랙을 추적하도록 하고 있다. 즉, 4개의 파이로트 신호 f1, f2, f3, f4를 사용하여 기록하고, 재생시 프로세서에서 인접 트랙간의 상기 기록된 파이로트 신호를 감산처리하면, f1- f2= 16KHz, f2- f3=47KHz, f3- f4= 16KHz, f4- f1= 47KHz로 되고, 제1도의 도면서 헤드의 위치가 트랙을 벗어나서 트랙킹(Tracking)을 수행할 때에, 제1도의 (a)와 같이 벗어나면 프로세서부에서 f1- f2, f2- f3값을 검출하게 되고, 이때 f2- f3=47KHz의 신호가 검출하여 47BPF를 통과하면 차동증폭기(제3도의 6)의 (+)단자에 입력되는 차신호의 크기를 판단하여(이때 f1- f2= 16KHz의 신호는 검출되지 않음) 이것을 샘플 앤드 홀드회로(제3도의 7,8)에서 에러값을 검출하여 콘트롤 신호를 만들어 트랙킹을 자동으로 조절하게 된다.At the time of reproduction, the signal reproduced from the head H is subtracted from the adjacent frequency through the reproduction amplifier PB and output, and the signal is output through two 47 KHz and 16 KHz band pass filters 4 and 5, respectively. It is applied to the non-inverting (+) input terminal and the inverting (-) input terminal of the differential amplifier (6), and its output terminal signal determines which track side adjacent to the left and right side is further biased. By controlling, the head H keeps track of the original track. That is, if four pilot signals f 1 , f 2 , f 3 , f 4 are recorded, and the playback subtracts the recorded pilot signal between adjacent tracks during playback, f 1 -f 2 = 16 KHz, When f 2 -f 3 = 47 KHz, f 3 -f 4 = 16 KHz, f 4 -f 1 = 47 KHz, and the tracking of the head of the first degree is off the track to perform tracking, If (a) deviates, the processor detects the values of f 1 -f 2 and f 2 -f 3 , and when the signal f 2 -f 3 = 47KHz is detected and passes 47BPF, the differential amplifier (Fig. The magnitude of the difference signal input to the (+) terminal of 6) is judged (at this time, a signal of f 1 -f 2 = 16 KHz is not detected) and the error value is obtained from the sample and hold circuit (7,8 in FIG. By detecting and generating a control signal, the tracking is adjusted automatically.
그리고 (b)의 경우는 (a)와 반대로 16KHz의 신호가 검출되어 트랙키을 조절하게 되고, 도면 (c)의 경우는 정 트랙킹상태로서 자동증폭의 양단에 걸리는 전압이 동일하거나 "0"가 되는 것으로 기존에는 4개의 파이로트 신호를 사용하여 자동 트랙킹조절을 한다.In the case of (b), a signal of 16 KHz is detected as opposed to (a), and the track key is adjusted. In the case of (c), the voltage applied to both ends of the automatic amplification is the same or becomes "0" in the positive tracking state. In the past, four pilot signals are used for automatic tracking control.
그러나, 이와 같은 종래의 장치는 프로세싱 하기가 어려울 뿐만 아니라, 제3도에서 점선으로 도시된 파이로트 신호발생부의 구성이 매우 복잡하여 제품 코스트를 상승시키는 문제점이 있었다.However, such a conventional device is not only difficult to process, but also has a problem in that the configuration of the pilot signal generator shown by the dotted line in FIG.
본, 고안은 이와 같은 종래의 문제점을 감안하여 2개의 파이로트 신호를 사용하고, 재생된 2의 주파수를 비교하여 생성되는 제어출력전압으로서 자동적으로 트랙을 추적할 수 있는 회로를 제공하고자 하는 것으로, 종래의 점선 부분의 파이로트 신호 발생부를 없애는 대신 스위치(SW3), (SW4)를 사용하여 마이크로 프로세서에 의하여 제어되게 함으로써 코스크를 다운시켰으며, 마이크로 프로세서를 이용한 스위칭제어는 현재의 VTR 서보 회로에서 코스트 상승없이 실현할수 있게 한 것이다.The present invention is to provide a circuit that can track a track automatically as a control output voltage generated by using two pilot signals and comparing the frequency of the reproduced 2 in view of such a conventional problem, Instead of eliminating the conventional pilot signal generation part of the dotted line part, the coke was down by being controlled by the microprocessor using the switches SW 3 and SW 4 , and the switching control using the micro processor is the current VTR servo circuit. It is possible to realize the cost without increasing the cost.
이를 첨부한 도면에 의하여 상세히 설명하면 다음과 같다.When described in detail by the accompanying drawings as follows.
본 고안은 제4도에 도시한 바와 같이, 입력동기 신호(SW30)(SW15)가 가해지는 주파수 발생기(1)에 믹서(2)를 연결하고, 이에 헤드(H) 및 재생앰프(PB)를 통하여 영상신호 처리계와 주파수 밴드 패스필터(f1BPF), (f2BPF)(9), (10)를 각각 접속하며, 이에 인버터(I1), (I2) 및 적분기(11), (12)를 통하여 차동증폭기(6)를 연결하고, 상기 차동증폭기(6)의 출력단에는 각각 스위치(SW3), (SW4) 및 샘플 앤드 홀드 회로(7), (8)를 연결하여 구성한다.As shown in FIG. 4, the mixer 2 is connected to the frequency generator 1 to which the input synchronization signals SW30 and SW15 are applied, and thus the head H and the reproduction amplifier PB are connected to each other. The video signal processing system and the frequency band pass filter (f 1 BPF), (f 2 BPF) (9), (10) are respectively connected to the inverter (I 1 ), (I 2 ) and integrator (11), A differential amplifier 6 is connected through 12, and a switch SW 3 , SW 4 , and sample and hold circuits 7 and 8 are respectively connected to an output terminal of the differential amplifier 6. do.
이와 같이 구성된 본 고안의 작용효과를 설명하면 다음과 같다.Referring to the effect of the present invention configured as described above are as follows.
제4도에서와 같이, 동기 신호(SW30)(SW15)를 제어신호로서 주파수발생기(1)에서 파이로트 주파수(f1), (f2)를 기록하고, 재생시에 밴드 패스필터(9), (10)를 거친 신호가 차동증폭기(6)를 통하고, 다시 샘플 앤드회로(7), (8)를 통하여 자동적으로 트랙을 제어한다.As shown in FIG. 4, the pilot signals f 1 and f 2 are recorded by the frequency generator 1 as the control signal as the synchronization signal SW30 (SW15), and the band pass filter 9, The signal passed by (10) is controlled via the differential amplifier (6), and again through the sample end circuits (7) and (8).
즉, 제2도에 나타낸 바와 같이 f1무신호, f2무신호 순으로 기록하였다가 재생시에는 밴드 패스필터(9), (10)를 통한 2개의 값은 인버터(I1), (I2) 또는 직접 가해지고, 그의 출력 전압으로서 테이프의 속도를 제어한다.That is, as shown in FIG. 2, two values through the band pass filters 9 and 10 are recorded in the order of f 1 no signal and f 2 no signal, and then the inverters I 1 and (I 2 ). Or directly to control the speed of the tape as its output voltage.
여기에서, 제5도에 나타낸 B'인 경우에만 인버터(I1), (I2)를 통하여 연결하고, 그 밖에는 직접 가해주게 된다. 즉, 제4필드(2번째 무신호일 경우)에서 인버터(I1), (I2)를 거치게 하는 이유는 제2필드의 스캔시 좌우에 위치한 주파수와, 제4필드의 스캔시 좌우 주파수 위치가 바뀌어 지게 되므로 샘플 앤드 홀드(7), (8)에서의 입력을 전환시키는 번거로움을 초래하게 되는 것을 방지할 수 있다.Here, the connection is made only through the inverters I 1 and I 2 only in the case of B ′ shown in FIG. 5, and is directly applied elsewhere. That is, the reason for passing the inverters I 1 and (I 2 ) in the fourth field (in the case of the second non- signal) is that the frequencies located at the left and right when scanning the second field, and the left and right frequency positions when the fourth field is scanned. Since it changes, it can prevent that the trouble of switching inputs in the sample and hold 7 and 8 is switched.
다음에, 샘플 앤드 홀드 회로(7), (8)는 동기신호(SW30)로, 무신호(제2도의 B. B' 트랙)인 경우에는, 샘플링을 하고, 신호가 있는 경우(제2도의 A. A' 트랙)에는 제어출력을 홀드시킨다.Next, the sample and hold circuits 7 and 8 are the synchronization signals SW30, which are sampled when there is no signal (B.B 'track in FIG. 2), and when there is a signal (see FIG. A. A 'track) hold the control output.
이관계를 제5도와 같이 설명하면, 제5도는 기록시의 주파수 발생기와 재생시의 샘플 핸드 홀드하는 동작을 나타내고 있는 타이밍 챠트로서, 제어신호(SW30)(SW15)가 각각 1, 1인 경우에는 주파수(f1)를 기록고, 1.0인 경우에는 주파수(f2)를 기록하고, 0, 1과 0, 0인 경우에는 파이로트 신호를 기록하지 않는다.Referring to this relationship as shown in Fig. 5, Fig. 5 is a timing chart showing the operation of the frequency generator at the time of recording and the sample hand hold at the time of reproduction, and the frequency when the control signals SW30 (SW15) are 1 and 1, respectively. Record (f 1 ) and record the frequency (f 2 ) for 1.0, and do not record the pilot signal for 0, 1 and 0, 0.
재생시에는 샘플 앤드 홀드시에 캡스 턴의 펄스 발생기(도시 생략함)로부터 발생되는 동기신호(SW30)(SW15)를 이용하여 기록시의 동일한 타이밍으로 1, 1과 1,0인 경우에는 샘플링 제어하고, 0, 1과 0, 0인 경우에는 제5도에 나타낸 바와 같이 홀드하게 된다. 즉, 재생시 밴드 패스 필터(9), (10)의 출력은 (ㄴ), (다)와 같이 되고, 스위치(SW1), (SW2)를 통한 후 적분기(11), (12)의 출력은 (라), (마)와 같이 된다. 이 (라), (마)의 출력은 차동증폭기에서 (바)와 같은 출력이 발생되어 샘플 앤드 홀드(7), (8)로 출력되는 신호에 의하여 자동적으로 트랙킹되는것으로, 헤드는 대개 제1필드 및 제2필드를 거쳐 통과하기 때문에 차등증폭기(6)에서 그차를 에러 신호로서 (바)와 같이 출력시키고, 이 에러 신호에 의하여 샘플 앤드 홀드회로(8)에서 (사)와 같은 출력을 발생시키게 된다. 이때 샘플 앤드 홀드회로(7)의 출력 (사)는 헤드 스위칭 신호로서 사용할수 있다.At the time of reproduction, sampling control is performed in the case of 1, 1 and 1,0 at the same timing at the time of recording by using the synchronization signal (SW30) (SW15) generated from the pulse generator (not shown) of the capstan at the time of sample and hold. , 0, 1 and 0, 0 hold as shown in FIG. In other words, the outputs of the band pass filters 9 and 10 during reproduction are as shown in (b) and (c), and the outputs of the integrators 11 and 12 through the switches SW 1 and SW 2 . The output looks like (d) and (d). The outputs of (d) and (d) are automatically tracked by signals outputted to the sample and hold (7) and (8) by generating the same output as (a) in the differential amplifier. Since it passes through the field and the second field, the differential amplifier 6 outputs the difference as an error signal as shown in (bar), and generates an output such as (g) in the sample and hold circuit 8 by this error signal. Let's go. At this time, the output (g) of the sample and hold circuit 7 can be used as the head switching signal.
즉, 제2도에서 (a)와 같이 제2필드에서 f2쪽으로 헤드가 치우친 경우에는 f2밴드 패스 필터의 값이 검출되어 차동증폭기 (6)로 입력되고, f1쪽으로 도면 (b)와 같이 치우진 경우에는 f1밴드 패스 필터의 값이 차동증폭기(6)의 출력전압으로 커지게 되어 자동적으로 트랙킹이 조절되고, f1, f2값이 동일하거나 검출되지 않는 경우에는 "0"크래킹 상태로 판단하게 되어 자동 트랙킹 된다.That is, when the head is biased toward f 2 in the second field as shown in (a) in FIG. 2 , the value of the f 2 band pass filter is detected and input to the differential amplifier 6, and the direction f 1 toward the drawing (b) and In the case of the shift, the value of the f 1 band pass filter is increased to the output voltage of the differential amplifier 6 so that the tracking is automatically adjusted. If the values of f 1 and f 2 are the same or are not detected, the cracking is "0". It is judged as a state and is automatically tracked.
결국 f1, f2를 스캔할 경우, 마이크로 프로세서에서 스위치(SW2), (SW4)를 「오프」시켜서 f1, f2를 스캔 하기전 트랙(무신호 트랙)에서 검출한 자동 트랙킹 정보에 의하여 트랙킹을 계속 유지하게 되고, 제2도에서 f1트랙을 스캔한 후 무신호 트랙에서 f1, f2의 상관관계를 이용해서 트랙킹에러(Tracking Error) 값을 검출하여 샘플 앤드 홀드한후 콘트롤신호를 출력하게 하고, f2트랙 스캔시 스위치(SW3), (SW4)를 「오프」시켜 f2트랙전의 무신호 트랙에서 발생한 콘트롤신호가 f2트랙 스캔 동안 계속 출력하고, 다시 무신호 트랙에서 스위치(SW3), (SW4)는 「온」되고, 스위치(SW1), (SW2)는 f1, f2쪽으로 절환하여 트랙을 조절하게 된다.After all, when scanning f 1 , f 2 , the microprocessor "turns off" the switches (SW 2 ), (SW 4 ) and the automatic tracking information detected on the track (no signal track) before scanning f 1 , f 2 . Tracking is maintained, and after scanning the f 1 track in FIG. 2 , the tracking error value is detected and sampled and held using the correlation of f 1 and f 2 in the no-signal track. The control signal is output, and when the f 2 track is scanned, the switches SW 3 and SW 4 are turned off so that the control signal generated from the no signal track before the f 2 track continues to be output during the f 2 track scan. In the signal track, the switches SW 3 and SW 4 are turned on, and the switches SW 1 and SW 2 are switched to f 1 and f 2 to adjust the track.
이상에서와 같이 2개의 주파수만을 파이로트 신호로 기록하고, 재생된 2개의 주파수를 비교하여 제어출력전압으로 자동트랙킹 화인 동작을 수행할 수가 있는 것으로 회로의 단순환 및 제품의 코스트를 절감할 수 있는 실용적인 고안인 것이다.As described above, only two frequencies can be recorded as a pilot signal, and the two tracks can be compared and the auto-tracking fine operation can be performed with the control output voltage. It is a practical design.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019870022451U KR930001595Y1 (en) | 1987-12-19 | 1987-12-19 | Auto-tracking fine circuit using pilot signal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019870022451U KR930001595Y1 (en) | 1987-12-19 | 1987-12-19 | Auto-tracking fine circuit using pilot signal |
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| Publication Number | Publication Date |
|---|---|
| KR890014403U KR890014403U (en) | 1989-08-10 |
| KR930001595Y1 true KR930001595Y1 (en) | 1993-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR2019870022451U KR930001595Y1 (en) | 1987-12-19 | 1987-12-19 | Auto-tracking fine circuit using pilot signal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100433717B1 (en) * | 2001-04-04 | 2004-05-31 | 이광일 | Check valve off air pump |
| KR100790738B1 (en) * | 2007-02-27 | 2008-01-02 | 이광일 | The air pump where the air discharge efficiency is doubled |
-
1987
- 1987-12-19 KR KR2019870022451U patent/KR930001595Y1/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100433717B1 (en) * | 2001-04-04 | 2004-05-31 | 이광일 | Check valve off air pump |
| KR100790738B1 (en) * | 2007-02-27 | 2008-01-02 | 이광일 | The air pump where the air discharge efficiency is doubled |
Also Published As
| Publication number | Publication date |
|---|---|
| KR890014403U (en) | 1989-08-10 |
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