KR900007016B1 - Tracking error ditecting circuit in r-dat - Google Patents

Tracking error ditecting circuit in r-dat Download PDF

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KR900007016B1
KR900007016B1 KR1019860011635A KR860011635A KR900007016B1 KR 900007016 B1 KR900007016 B1 KR 900007016B1 KR 1019860011635 A KR1019860011635 A KR 1019860011635A KR 860011635 A KR860011635 A KR 860011635A KR 900007016 B1 KR900007016 B1 KR 900007016B1
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signal
pilot
track
pass filter
sampling
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KR1019860011635A
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Korean (ko)
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KR880008245A (en
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서현준
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삼성전자 주식회사
한형수
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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

Abstract

A tracking error detection circuit for rotary digital audio recorder comprises a pilot freq. low pass filter (1), a pilot freq. detecter (2) for detecting an accurate pilot signal from the output of the pilot freq. low pass filter, sampling and holding circuits (3,4) for sampling and holding the pilot freq. by the pulse from a timing circuit (7), a sync. signal band pass filter (5), a sync. signal detecter (6) for detecting an accurate sync. signal from the output of the sync. signal band pass filter, and a differential amplifier (8) for differentially amplifying the output of the sync. signal detecter.

Description

R -DAT의 트랙킹에러 감지희로Tracking error of R-DAT

제 1 도는 본 발명의 회로도.1 is a circuit diagram of the present invention.

제 2 도는 (a) (b)는 본 발명의 테이프에 기록된 신호의 상태 및 샘플타이밍도이다.Fig. 2 (a) and (b) show the state and sample timing of the signal recorded on the tape of the present invention.

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

1 : 파이롯트주파수 저역통과여파기 2 : 파이롯트주파수 검출부1: Pilot frequency low pass filter 2: Pilot frequency detector

3,4 : 샘플링앤드홀드 5 : 동기신호 대역 통과여파기3,4: sampling and hold 5: synchronization signal bandpass filter

6 : 동기신호 검출부 7 : 타이밍회로6 sync signal detector 7 timing circuit

8 : 차동증폭부 RF : 헤드에서 읽혀진 신호8: differential amplifier RF: signal read from the head

TE : 트랙킹 에러신호TE: Tracking error signal

본 발명은 R-DAT(ROTARY-DIGITAL TAPE RECORDER)의 헤드가 테이프상에 기록된 트랙을 정확하게 트랙킹하고 있지 않을경우 그때의 트랙킹오차를 감지하여 헤드를 정확히 트랙킹시키도록 된 R-DAT의 트랙킹에러 검지회로에 관한 것이다.According to the present invention, when the head of the R-DAT (ROTARY-DIGITAL TAPE RECORDER) does not accurately track the track recorded on the tape, the tracking error of the R-DAT is detected so as to detect the tracking error at that time and accurately track the head. It is about a circuit.

일반적으로 오디오 데크기기에는 현재 가장 일반적으로 사용되는 테이프상에 아날로그신호가 기록된 테이프를 이용하는 것과, 디지탈신호가 기록된 테이프를 이용하는 것이 있는데, 이들중 디지탈신호가 기록된 테이프를 이용하는 오디오 데크기기는 DAT(DIGITAL AUDIO TAPE RFCORDER)이라고 불리워지고 있다. 이들 DAT중에서도 다시 세분하면, VTR과 같이 회전헤드를 사용하여 테이프상에 기록된 디지탈신호를 재생시키는 DAT를 R-DAT(ROTARY-DAT)라 칭하고, 기존의 카셋트 데크와 같은 고정헤드를 사용하여 테이프상에 기록된 디지탈신호를 재생시키는 DAT를 S-DAT(STATIC-DAT)라 칭한다. 그런데 상기 R-DAT에서는 헤드가 테이프상에 기록된 디지탈신호의 트랙을 정확하게 트랙킹하여야만 정확한 음을 재생시킬 수 있는데, 헤드가 테이프상에 기록된 디지탈신호의 트랙을 정확하게 트랙킹하지 못하였을 경우에는 잡음신호가 출력되게 되는 문제점이 있었다.In general, audio deck equipments use tapes in which analog signals are recorded on the most commonly used tapes, and tapes in which digital signals are recorded. Among them, audio deck equipments using tapes in which digital signals are recorded are used. It is called DAT (DIGITAL AUDIO TAPE RFCORDER). Subdivided again among these DATs, a DAT that reproduces a digital signal recorded on a tape using a rotating head like a VTR is called R-DAT (ROTARY-DAT), and the tape is fixed using a fixed head such as a cassette deck. The DAT for reproducing the digital signal recorded on the image is called S-DAT (STATIC-DAT). However, in the R-DAT, accurate sound can be reproduced only when the head accurately tracks the track of the digital signal recorded on the tape. However, when the head does not accurately track the track of the digital signal recorded on the tape, the noise signal is reproduced. There was a problem that is output.

이에 본 발명은 상기한 문제점을 해소시키기 위해서 발명된 것으로 헤드가 디지탈신호가 기록된 테이프의 트랙을 정확히 트랙킹하지 못하여 잡음신호를 발생시킬 경우 그때 발생되는 트랙킹에러 신호에 의해 캡스틴모우터를 제어하여 헤드의 위치를 정정시켜 정확한 트랙킹을 할 수 있도록 하므로써 정확한 음을 재생시킬수 있도록한 R-DAT의 트랙킹에러 감지회로를 제공하고자 함에 그 목적이 있다.Accordingly, the present invention was invented to solve the above problems, and when the head does not accurately track the track of the tape on which the digital signal is recorded to generate a noise signal, the capstine motor is controlled by the tracking error signal generated at that time. It is an object of the present invention to provide a tracking error detection circuit of the R-DAT that enables accurate tracking by correcting the position of the head to enable accurate tracking.

이하 본 발명의 구성 및 작용·효과를 예시도면에 의거하여 상세히 설명하면 다음과 같다.Hereinafter, the configuration, operation, and effects of the present invention will be described in detail with reference to the accompanying drawings.

본 발명은 파이롯트신호만을 검출하기 위한 파이롯트주파수 저역통과여파기(1)와, 상기 파이롯트주파수 저역통과여파기(1)에서 검출된 파이롯트주파수를 다시한번 검출하여 정확한 파이롯트신호만을 검출하는 파이롯트주파수 검출부(2), 타이밍회로(7)에서 발생되는 샘플펄스에 의해 검출된 파이롯트신호를 샘플링과 홀드시키는 샘플링앤드홀드(3)(4), 동기신호를 검출하기 위해 동기신호만을 통과시키는 동기신호 대역통과여파기(5), 상기 동기신호 대역통과여파기(5)에서 여파된 신호중 동기신호만을 정확히 검출하기 위한 동기신호 검출부(6), 상기 동기신호 검출부(6)에서 출력된 동기신호에 의해 펄스를 발생시키기 위한 타이밍회로(7) 및, 상기 샘플링앤드홀드(3)(4)에서 출력된 신호를 차동증폭시키는 차동증폭기(8)로 구성되어 있다.According to the present invention, a pilot frequency low pass filter 1 for detecting only a pilot signal and a pilot frequency detection unit 2 for detecting only the correct pilot signal by detecting the pilot frequency detected by the pilot frequency low pass filter 1 again. A sampling and hold (3) (4) for sampling and holding the pilot signal detected by the sample pulse generated by the timing circuit (7), and a synchronization signal bandpass filter (5) for passing only the synchronization signal to detect the synchronization signal. ), A synchronization signal detector 6 for accurately detecting only a synchronization signal among the signals filtered by the synchronization signal bandpass filter 5, and a timing circuit for generating a pulse by the synchronization signal output from the synchronization signal detector 6 (7) and a differential amplifier (8) for differentially amplifying the signal output from the sampling and holding (3) (4).

제 1 도는 상기한 바와 같이 구성된 본 발명의 회로도로서, 먼저 제 2 도에 도시된 f1신호 즉 파이롯트신호가 트랙킹에러를 생성하는 데 직접사용되는 파이롯트신호이고, f2,f3신호 즉 동기신호는 f1신호의 위치를 알려주기위한 동기신호이며, 상기 f1신호는 2블록(lblock=38.3μs)로 구성되어 있고, 상기 f2,f3신호는 홀수프레임에서는 1블록, 짝수프레임에서는 0.5블록으로 이루어져 있다.FIG. 1 is a circuit diagram of the present invention configured as described above. First, the f 1 signal, i.e., the pilot signal, shown in FIG. 2 is a pilot signal directly used to generate a tracking error, and the f 2 , f 3 signal, i.e., a synchronization signal. is a synchronizing signal for informing the location of the signal f 1, wherein f 1 signal is two blocks is composed of a (lblock = 38.3μs), wherein f 2, f 3 is a signal in the odd frame in the first block, even-numbered frames 0.5 It consists of blocks.

먼저 A헤드가 짝수프레임의 A2트랙을 트랙킹할 경우에는 맨처음 읽어들이는 신호가 A2트랙의 파이룻트신호(f1)이고, 그후 소거신호(f4), 동기신호(f2)순으로 트랙킹하게 된다. 상기 동기신호(f2)가 트랙킹될때 이신호는 동기신호 대역통과여파기(5)와 동기신호 검출부(6) 및 타이밍검출부(7)를 통해 제 2 도 b의 (2)와 같은 샘플링신호(SPL1)를 발생시키게 되면 B2트랙에서 동기신호(f2)에 크로스토크(crosstalk)되는 B2트랙의 파이롯트신호(f1)가 파이롯트주파수 저역통과여파기 저역통과여파기(1)와 파이롯트주파수 검출부(2)를 통해 샘플링앤드홀드(3)에 샘플링되어 홀드되게 되고, 그후 정확히 한블록 지연된 다음 타이밍회로(7)에서 제 2 도b의 (2)와 같은 샘플링신호(SPL2)를 발생시키면 트랙(B3)의 파이롯트신호(f1)가 파이롯트주파수 저역통과여파기(1)와 파이롯트주파수 검출부(2)를 통해 샘플링앤드흘드(4)에 샘플링되어 홀드되게 된다. 따라서 상기 샘플링 앤드홀드(3)(4)에 흘드된 양이 차동증폭기(8)에서 차동중폭되게 되는데, 이때 A헤드가 정확하게 A2트랙을 트랙킹 하였다면 B2트랙의 파이롯트신호(f1)와 B3트랙의 파이롯트신호(f1)의 크로스토크의 양이 같아지므로 트랙킹에러가 "0"이되고, B2트랙에서 읽혀진 크로스토크양과 B3트랙에서 읽혀진 크로스토크양에 차이가 생기면 헤드가 정확히 A2트랙을 트랙킹하지 못하고 한쪽으로 치우쳐져 트랙킹되었음을 뜻하므로 상기 차에 해당하는 양이 차동증폭기(8)로부터 출력되어 캡스턴모우터(도시되어 있지않음)의 서어보회로에 입력되게 되므로 테이프의 속도를 빠르게 혹은 느리게 제어하여 헤드의 트랙킹을 정확하게 교정시키게 된다.First, when the head A tracks an even track A 2 track, the first signal to be read is the pilot signal f 1 of the A 2 track, followed by the erase signal f 4 and the sync signal f 2 . To track. When the synchronization signal f 2 is tracked, this signal is passed through the synchronization signal bandpass filter 5, the synchronization signal detector 6, and the timing detector 7 to receive the sampling signal SPL 1 shown in FIG. ) the Let it occurs at B 2 tracks of the crosstalk (crosstalk) B 2 tracks the synchronization signal (f 2) pilot signal (f 1) is passed through pilot frequency low pass filter low-pass filter 1 and the pilot frequency detector (2 Is sampled and held by the sampling and hold (3), and after a delay of exactly one block, the timing circuit (7) generates a sampling signal (SPL 2 ) such as (2) of FIG. 3) it is sampled in the sampling-and-heuldeu 4 via a pilot signal (f 1) is passed through the low-frequency pilot filter 1 and the pilot frequency detector (2) is to be held. Therefore, the amount of the sampled hold (3) (4) is differentially amplified by the differential amplifier (8), if the A head tracks the track A 2 accurately, the pilot signal (f 1 ) and B of the track B 2 Since the amount of crosstalk of the three- track pilot signal f 1 is the same, the tracking error becomes "0", and if there is a difference between the amount of crosstalk read from the track B 2 and the amount of crosstalk read from the B 3 track, the head is exactly A. 2 Since the track cannot be tracked and it is tracked to one side, the amount corresponding to the difference is output from the differential amplifier 8 and input to the servo circuit of the capstan motor (not shown). Quick or slow control ensures accurate tracking of the head.

한편 B헤드가 트랙(B2)을 트랙킹하고 있을 경우에는, 헤드가 처음 동기신호(f3)를 트랙킹하게 되므로 상기 동기신호(f3)는 동기신호 대역통과여파기(5)와 동기신호 검출부(5)를 통해 타이밍회로(7)에 입력되어 제 2 도(b)의 (4)에 도시된 바와 같은 샘플링신호(SPL1)를 발생시키게 됨과 더불어 상기 동기신호(f3)에 크로스토크되는 A1트랙의 파이롯트신호(f1) 이 파이롯트주파수 저역통과여파기(1)와 파이롯트주파수 검출부(2)를 통해서 샘플링앤드홀드(3)에 샘플이되어 홀드되게 되고, 정확하게 한 블록지연된 다음 제 2 도 b의 (4)에서와 같은 샘플링신호(SPL2) 가 타이밍회로(7)에서 출력되면, A2트랙에서 크로스토크된 파이롯트주파수(f1) 가 파이롯트주파수 저역통과여파기(1)와 파이롯트주파수 검출부(2)를 거쳐 샘플링앤드홀드(4)에 샘플링된 다음 홀드되게 된다. 따라서 차동증폭기(8)에서 상기 샘플링앤드홀드(3) (4)의 신호를 차동증폭시키게 된다.Meanwhile, when the B head is to track the track (B 2), the head, so that tracking the first synchronization signal (f 3) of the synchronization signal (f 3) is passed through the synchronization signal band filter (5) and the synchronization signal detector ( A, which is input to the timing circuit 7 through 5) and generates the sampling signal SPL 1 as shown in (4) of FIG. 2 (b), is crosstalked to the synchronization signal f 3 . The pilot signal f 1 of one track is sampled and held in the sampling and hold 3 through the pilot frequency low pass filter 1 and the pilot frequency detection unit 2, and is correctly delayed by one block. When the sampling signal SPL 2 as in (4) is outputted from the timing circuit 7, the pilot frequency f 1 crosstalked on the track A 2 becomes the pilot frequency low pass filter 1 and the pilot frequency detection unit ( Sampled to the sampling and holding (4) via Will be. Therefore, the differential amplifier 8 differentially amplifies the signals of the sampling and hold 3 and 4.

이때 헤드가 B2트랙을 정확히 트랙킹하였다면 차동증폭기(8)의 출력에서 "0"가 출력되게 되고, A1트랙에서 크로스토크로 읽혀진 량과 A2트랙에서 크로스토크되어 읽혀진 량에 차가 발생하게 되면 상기 차신호가 캐스턴모우터(도시되어 있지않음)의 서어보회로에 입력되게 되므로 테이프의 속도를 빠르게 혹은 느리게 제어하여 헤드의 트랙킹을 정확하게 교정시켜 정확한 디지탈신호를 재생시키게 한다.At this time, if the head is If accurately track the B 2 tracks are to be "0" is output from the output of the differential amplifier 8, the cross-talk in volume and A 2 tracks are read to the cross talk in A 1 tracks the difference occurs in the read amount Since the difference signal is input to the servo circuit of the caster motor (not shown), the speed of the tape is controlled to be fast or slow so that the tracking of the head can be accurately corrected to reproduce an accurate digital signal.

상기한 바와 같이 본 발명은 R-DAT에서 헤드가 정해진 트랙을 트랙킹하지 못하여 잡음신호가 발생하게 될때 트랙킹에러에 해당하는 에러신호를 발생시켜 헤드의 트랙킹의 교정시켜 선명한 오디오신호를 재생시킬 수 있도록 된 것을 장점으로 한다.As described above, the present invention generates an error signal corresponding to a tracking error when the head cannot track a predetermined track in R-DAT, thereby correcting the tracking of the head, thereby reproducing a clear audio signal. It has an advantage.

Claims (1)

파이롯트신호만을 검출하기 위한 파이롯트주파수 저역통과여파기(1)와 상기 파이롯트 저역통과여파기(1)에서 검출된 파이롯트주파수를 다시한번 검출하여 정확한 파이롯트신호를 검출하는 파이롯트주파수 검출부(2), 타이밍회로(7)에서의 펄스에 의해 파이롯트주파수를 샘플링과 홀드시키는 샘플링앤드흘드(3) (4), 동기신호 대역통과여파기(5), 상기 동기신호 대역통과여파기(5)에서 여파된 신호중 동기신호만을 정확히 검출하기 위한 동기신호 검출부(6), 상기 동기신호 검출부(6)에서 출력된 신호를 차동증폭시키는 차동증폭기(8)로 구성되어 헤드가 디지탈신호가 기록된 트랙을 정확히 트랙킹하지 못하였을 경우 정확한 트랙킹이 될수 있도록 에러신호를 발생시키는 것을 특징으로 하는 R-DAT의 트랙킹에러 감지회로.A pilot frequency low pass filter 1 for detecting only a pilot signal, and a pilot frequency detector 2 for detecting an accurate pilot signal by detecting the pilot frequency detected by the pilot low pass filter 1, and a timing circuit 7 Accurately detects only the synchronous signal among the signals filtered by the sampling and reception (3) (4), the synchronous signal bandpass filter (5), and the synchronous signal bandpass filter (5) for sampling and holding the pilot frequency by the pulses The synchronization signal detector 6 and the differential amplifier 8 differentially amplify the signal output from the synchronization signal detector 6 so that when the head fails to accurately track the track on which the digital signal is recorded, accurate tracking is achieved. Tracking error detection circuit of the R-DAT, characterized in that for generating an error signal.
KR1019860011635A 1986-12-31 1986-12-31 Tracking error ditecting circuit in r-dat KR900007016B1 (en)

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KR1019860011635A KR900007016B1 (en) 1986-12-31 1986-12-31 Tracking error ditecting circuit in r-dat

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KR1019860011635A KR900007016B1 (en) 1986-12-31 1986-12-31 Tracking error ditecting circuit in r-dat

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KR880008245A KR880008245A (en) 1988-08-30
KR900007016B1 true KR900007016B1 (en) 1990-09-27

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