KR970005047Y1 - Auto-tracking control apparatus - Google Patents
Auto-tracking control apparatus Download PDFInfo
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- KR970005047Y1 KR970005047Y1 KR92021626U KR920021626U KR970005047Y1 KR 970005047 Y1 KR970005047 Y1 KR 970005047Y1 KR 92021626 U KR92021626 U KR 92021626U KR 920021626 U KR920021626 U KR 920021626U KR 970005047 Y1 KR970005047 Y1 KR 970005047Y1
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- magnitude
- pilot signal
- pilot
- detector
- heads
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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
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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
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
Landscapes
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Abstract
내용없음No content
Description
제1도의 (a), (b)는 종래의 제어장치에 의하여 형성된 아지무스각을 보인 설명도(A), (b) of FIG. 1 is explanatory drawing which shows the azimuth angle formed by the conventional control apparatus.
제2도의 (a), (b)는 본 고안의 제어장치에 의하여 회전드럼에 설치된 헤드의 위치 및 아지무스각을 보인 설명도(A), (b) of FIG. 2 is an explanatory view showing the position and azimuth angle of the head installed in the rotating drum by the control device of the present invention
제3도는 본 도안의 제어장치에 의하여 테이프에 기록된 파리로트 신호를 보인 설명도3 is an explanatory diagram showing a parrot signal recorded on a tape by the control device of this figure.
제4도는 본 고안의 제어장치의 회로도4 is a circuit diagram of a control device of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
21 : 회전드럼 22, 23 : 헤드21: rotating drum 22, 23: head
24 : 비디오 테이프 31, 32 : 파이로트신호 검출부24: video tape 31, 32: pilot signal detection unit
33, 34 : 크기검출부 35 : 비교부33, 34: size detection unit 35: comparison unit
본 고안은 비디오 카세트 레코더등과 같은 영상기록 재생장치에 있어서, 회전드럼에 취부된 헤드가 비디오의 헬리컬 트랙을 트래킹하는 상태를 검출하고, 검출신호에 따라 캡스턴 모타의 구동을 위상 및 속도 제어하면서 비디오 테이프의 주행속도를 조절하여 헤드가 헬리켈 트랙을 정확히 트래킹할 수 있도록 하는 자동 트래킹 제어 장치에 관한 것이다.The present invention provides a video recording and reproducing apparatus such as a video cassette recorder, in which a head mounted on a rotating drum detects a state in which a helical track of a video is tracked, and controls a phase and speed of a capstan motor in accordance with a detection signal. The present invention relates to an automatic tracking control device that adjusts the running speed of a tape so that the head can accurately track a helikel track.
일반적으로 영상기록 재생장치는 영상신호의 기록시 헤드가 비디오 테이프를 헬리컬상으로 트래킹한 트랙을 재생시 정확히 트래킹해야 재생영상신호의 크기가 재생화면에 잡음이 없게 된다.In general, an image recording and reproducing apparatus must accurately track the head when the head tracks the video tape helically in recording the video signal so that the size of the reproduced video signal is noisy in the playback screen.
일반적으로 영상기록 재생장치는 영상신호의 기록시 헤드가 비디오 테이프를 헬리컬상으로 트래킹한 트랙을 재생시 정확히 트랙킹해야 재생영상신호의 크기가 크고 재생화면에 잡음이 없게 된다.In general, an image recording and reproducing apparatus requires a large track size when a head tracks a video tape helically to record a video signal, so that the size of the reproduced video signal is large and there is no noise in the playback screen.
이를 위하여 비디오 테이프의 특정부위에 소정의 파이로트 신호를 기록하여 두고, 재생시 그 파이로트 신호를 재생하여 크기 및 주파수등으로 헤드가 헬리컬 트랙을 벗어난 정도를 측정하며, 측정값에 따라 회전드럼의 헤드의 설치위치 및 비디오 테이프의 주행속도를 조절하여 헤드가 헬리컬 트랙을 정확히 트래킹하도록 하고 있다.For this purpose, a certain pilot signal is recorded on a specific part of the video tape, and during playback, the pilot signal is reproduced to measure the degree of head deviation from the helical track by the size and frequency, and according to the measured value, The position of the head and the speed of the video tape are adjusted to ensure that the head accurately tracks the helical track.
이러한 트래킹을 제어하기 위하여 종래에는 제1도의 (a)에 도시한 바와 같이, 서로 상이한 아지무스각(θ1), (θ2)을 가지는 두 개의 헤드(1), (2)를 겹합하여, 영상신호의 재생시 헤드(1), (2)가 비디오 테이프(3)의 헬리컬 트랙에서 벗어났을 경우에 재생클럭의 주기가 변화되고 변화된 재생클럭의 주기 또는 재생클럭을 소정의 값으로 분주한 신호의 주기를 계측하여 트래킹 에러를 검출하며 검출한 트래킹 값에 따라 PLL방식으로 오차를 보정하였다.In order to control such tracking, in the related art, as shown in FIG. 1A, two heads 1 and 2 having different azimuth angles θ1 and θ2 are superimposed, and the video signal When the heads (1) and (2) are out of the helical track of the video tape (3) at the time of reproduction, the period of the playback clock is changed and the period of the changed playback clock or the signal which divides the playback clock to a predetermined value. The tracking error is detected by measuring the error and the error is corrected by the PLL method according to the detected tracking value.
그러나 상기와 같이 트래킹 에러를 보정하는 서로 상이한 아지무스각을 가지는 2개의 헤드를 결합하는 것이 매우 어렵고, 정밀한 공정을 요구함으로 제품의 생산원가가 상승하게 되는 등의 문제점이 있었다.However, it is very difficult to combine the two heads having different azimuth angles to correct the tracking error as described above, and there is a problem that the production cost of the product is increased by requiring a precise process.
그러나 제1도의 (b)에 도시된 바와 같이 하나의 헤드(11)가 2가지의 아지무스각(θ11), (θ12)을 갖도록 구성하여 비디오 테이프(12)의 헬리컬 트랙에 기록하고, 재생시 신호의 포락선 레벨차를 비교하여 트래킹 에러를 검출 및 오차를 보정하는 것도 있으나, 하나의 헤드가 2가지의 아지무스각을 갖도록 구성하는 것이 매우 어렵고, 정밀한 제조공정을 요구하는 등의 문제점이 있었다.However, as shown in FIG. 1 (b), one head 11 is configured to have two azimuth angles θ11 and θ12 to record on a helical track of the video tape 12, and to reproduce Although the tracking error is detected and the error is corrected by comparing the envelope level difference of the signal, it is very difficult to configure one head to have two azimuth angles, and there is a problem such as requiring a precise manufacturing process.
본 고안은 상기와 같은 종래의 제반 문제점들을 해결하기 위하여 안출한 것으로서, 회전드럼에 서로 상이한 아지무스각을 가지는 2개의 헤드를 180°의 각도로 설치함과 아울러 비디오 테이프가 회전드럼에 180°이상권취되게 하여 2개의 헤드가 비디오 테이프에 동시에 접촉되는 부위가 있도록 하고, 프레임을 주기로 하여 2가지 주파수의 파이로트 신호를 헤드에 인가하여 기록하여 두며, 재생시 헤드가 검출하는 재생 파이로트 신호의 레벨을 비교하여 헤드가 헬리컬 트랙을 정확히 트래킹하도록 제어함은 물론 재생한 파이로트 신호로 재생영상신호의 프레임 및 필드를 구별할 수 있도록 하는 자동 트래킹 제어장치를 제공하는데 그 목적이 있는 것으로 이를 첨부된 제2도 내지 제4도의 도면을 참조하여 상세히 설명한다.The present invention has been devised to solve the above-mentioned problems. The two heads having different azimuth angles on the rotating drum are installed at an angle of 180 °, and the video tape is more than 180 ° on the rotating drum. It is wound so that the two heads are in contact with the video tape at the same time, and the pilot signal of two frequencies is applied to the head for recording at a frame period, and the level of the reproduction pilot signal detected by the head during playback is recorded. In order to control the head to accurately track the helical track and compare the frame with the reproduced pilot signal, it is possible to provide an automatic tracking control device for distinguishing the frame and the field of the reproduced video signal. A detailed description will be given with reference to the drawings of FIGS. 2 to 4.
제2도의 (a), (b)는 본 고안의 제어장치에 의하여 회전드럼에 설치된 헤드의 위치 및 아지무스각을 보인 설명도로서 이에 도시된 바와 같이 회전드럼(21)에 180°의 각도를 2개의 헤드(22), (23)를 고정 설치함과 아울러 회전드럼(21)에 비디오 테이프(24)가 180°이상 권취되게 하고, 헤드(22), (23)는 서로 상이한 아지무스각(θ21), (θ22)을 갖도록 구성하였다.(A) and (b) of FIG. 2 are explanatory views showing the position and azimuth angle of the head installed on the rotating drum by the control device of the present invention. As shown therein, an angle of 180 ° to the rotating drum 21 is shown. The two heads 22 and 23 are fixedly mounted, and the video tape 24 is wound around the rotating drum 21 by 180 ° or more, and the heads 22 and 23 are different from each other. θ21) and (θ22).
이와 같이 구성된 본 고안은 2개의 헤드(22), (23)가 회전드럼(21)에 180°의 각도를 설치되고, 비디오 테이프(24)는 180°이상 회전드럼(21)에 권취되므로 제3도에 도시된 바와 같이 하나의 헤드(22)또는 (23)가 비디오 테이프(24)의 N번째 트랙의 상단부위에 있을 경우에 다른 하나의 헤드(23)또는 (22)가 비디오 테이프(24)의 N+1번째 트랙의 하단부위에 있게된다.According to the present invention configured as described above, two heads 22 and 23 are installed at an angle of 180 ° to the rotating drum 21, and the video tape 24 is wound around the rotating drum 21 at least 180 °. As shown in the figure, when one head 22 or 23 is at the top of the Nth track of the video tape 24, the other head 23 or 22 is the video tape 24. At the bottom of the N + 1th track.
여기서, 본 고안은 영상신호의 기록시 헤드(22), (23)에 프레임을 단위로 하여 F1 및 F2 주파수의 파이로트 신호를 인가하여 비디오 테이프(24)에 기록되게 한다.Here, in the present invention, the pilot signals of the F1 and F2 frequencies are applied to the heads 22 and 23 in units of frames to record the video signals so that they are recorded on the video tape 24.
그리고 제4도는 본 고안의 제어장치의 회로도로서 이에 도시된 바와 같이, 헤드(22), (23)의 재생신호에서 파이로트 신호를 검출하는 증폭기(31A), (32A), F1주파수 대역통과필터(31B), (32B) 및 F2주파수 대역통과필터(31C), (32C)로 된 파이로트 신호 검출부(31), (32)와, 상기 파이로트 신호 검출부(31), (32)가 검출한 파이로트신호의 크기를 검출하는 크기검출기(33A, 33B), (34A, 34B)로 된 크기검출부(33), (34)와, 상기 크기검출부(33), (34)의 출력신호를 비교하여 속도/위상 오차신호를 출력하는 비교기(35A-35C)로 된 비교부(35)로 구성하였다.4 is a circuit diagram of the control device of the present invention, and as shown therein, the amplifiers 31A, 32A, and F1 frequency bandpass filters for detecting pilot signals from the reproduction signals of the heads 22 and 23. The pilot signal detectors 31 and 32 and the pilot signal detectors 31 and 32 detected by 31B, 32B, and F2 frequency bandpass filters 31C, 32C. The magnitude detectors 33 and 34 made up of the magnitude detectors 33A and 33B and 34A and 34B for detecting the magnitude of the pilot signal are compared with the output signals of the magnitude detectors 33 and 34. A comparator 35 made of comparators 35A-35C for outputting a speed / phase error signal.
이와 같이 구성된 본 고안은 재생시 헤드(22), (23)가 비디오 테이프(24)의 헬리컬 트랙을 트래킹하면서 신호를 재생하고 재생한 신호는 파이로트 검출부(31), (32)의 증폭기(31A), (32A)에서 각기 증폭되어 대역통과필터(31B, 31C), (32B, 32C)에 각기 입력된다.The present invention configured as described above reproduces the signal while the heads 22 and 23 track the helical track of the video tape 24 during reproduction, and the reproduced signal is the amplifier 31A of the pilot detectors 31 and 32. Amplified at 32A and input to the bandpass filters 31B, 31C and 32B, 32C, respectively.
그러면 대역통과필터(31B)(32B)는 F1주파수의 파이로트 신호를 검출하고, 대역통과필터(31C), (32C)는 F2주파수의 파이로트 신호를 검출하여, 대역통과필터(31B, 31C), (32B, 32C)가 검출한 파이로트 신호는 크기검출부(33), (34)의 크기 검출기(33A, 33B), (34A, 34B)에서 각기 그 크기가 검출되고, 비교부(35)의 비교기(35A), (35B)에서 크기가 비교되며, 비교기(35A), (35B)의 출력신호는 비교기(35C)에서 비교되어 속도/위치 오차신호로 출력한다.Then, the band pass filters 31B and 32B detect the pilot signal of the F1 frequency, and the band pass filters 31C and 32C detect the pilot signal of the F2 frequency, and the band pass filters 31B and 31C. , The pilot signal detected by (32B, 32C) is detected by the size detectors 33A, 33B, 34A, 34B of the size detectors 33, 34, respectively, and the size of the comparator 35 The magnitudes are compared in the comparators 35A and 35B, and the output signals of the comparators 35A and 35B are compared in the comparator 35C and output as a speed / position error signal.
이와 같이 비교기(35C)가 출력하는 속도/위치 오차신호는 헤드(22, 23)의 트래킹 에러값으로 이 비교기(35C)의 출력신호에 따라 비디오 테이프(24)를 주행시키는 캡스턴 모타의 구동속도 및 위상을 제어하여 헤드(22, 23)의 트래킹을 제어한다.As such, the speed / position error signal output by the comparator 35C is a tracking error value of the heads 22 and 23, and the driving speed of the capstan motor that drives the video tape 24 in accordance with the output signal of the comparator 35C. The phase is controlled to control tracking of the heads 22 and 23.
이상에서 상세히 설명한 바와 같이 본 고안은 2개의 헤드가 비디오 테이프에 동시에 접촉되는 부위가 있도록 하고 프레임 주기로 비디오 테이프에 주파수가 상이한 파이로트 신호를 기록하며, 재생시 2개의 헤드가 재생하는 파이로트 신호의 크기를 비교하여 트래킹을 제어하므로 헤드의 정밀한 가공이 요구되지 않아 제조가 간편하고, 정확히 트래킹을 제어함을 물론 재생되는 파이로트 신호를 이용하여 영상신호의 필드 및 프레임을 구별할 수 있는 등의 효과가 있다.As described in detail above, the present invention allows the two heads to be in contact with the video tape at the same time, records the pilot signals having different frequencies on the video tape at the frame period, and reproduces the pilot signals reproduced by the two heads during playback. By controlling the tracking by comparing the size, it is easy to manufacture because no precise processing of the head is required, and it is possible to accurately control the tracking and distinguish the field and frame of the video signal by using the reproduced pilot signal. There is.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR92021626U KR970005047Y1 (en) | 1992-11-05 | 1992-11-05 | Auto-tracking control apparatus |
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Application Number | Priority Date | Filing Date | Title |
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KR92021626U KR970005047Y1 (en) | 1992-11-05 | 1992-11-05 | Auto-tracking control apparatus |
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KR940013434U KR940013434U (en) | 1994-06-25 |
KR970005047Y1 true KR970005047Y1 (en) | 1997-05-22 |
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Application Number | Title | Priority Date | Filing Date |
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KR92021626U KR970005047Y1 (en) | 1992-11-05 | 1992-11-05 | Auto-tracking control apparatus |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR970005047Y1 (en) |
-
1992
- 1992-11-05 KR KR92021626U patent/KR970005047Y1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
KR940013434U (en) | 1994-06-25 |
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A201 | Request for examination | ||
E701 | Decision to grant or registration of patent right | ||
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LAPS | Lapse due to unpaid annual fee |