KR20040017874A - Method for controlling servo filter gain in optical disc device - Google Patents
Method for controlling servo filter gain in optical disc device Download PDFInfo
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- KR20040017874A KR20040017874A KR1020020049795A KR20020049795A KR20040017874A KR 20040017874 A KR20040017874 A KR 20040017874A KR 1020020049795 A KR1020020049795 A KR 1020020049795A KR 20020049795 A KR20020049795 A KR 20020049795A KR 20040017874 A KR20040017874 A KR 20040017874A
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- tracking
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- servo filter
- optical disk
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0941—Methods and circuits for servo gain or phase compensation during operation
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/0857—Arrangements for mechanically moving the whole head
- G11B7/08582—Sled-type positioners
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0925—Electromechanical actuators for lens positioning
- G11B7/093—Electromechanical actuators for lens positioning for focusing and tracking
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/095—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for discs, e.g. for compensation of eccentricity or wobble
- G11B7/0953—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for eccentricity of the disc or disc tracks
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2537—Optical discs
- G11B2220/2545—CDs
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2537—Optical discs
- G11B2220/2562—DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
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- Optical Recording Or Reproduction (AREA)
Abstract
Description
본 발명은, 씨디(CD) 또는 디브이디(DVD) 등과 같은 광디스크에 기록된 신호를 독출 재생하거나 또는 기록하기 위한 광디스크 장치에서의 서보 필터 게인 조절방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a servo filter gain adjusting method in an optical disc apparatus for reading out, reproducing or recording a signal recorded on an optical disc such as a CD or a DVD.
최근에는, 고화질의 비디오 데이터와 고음질의 오디오 데이터를 장시간 동안 기록 저장할 수 있는 광디스크, 예를 들어 재기록 가능한 디브이디(DVD-RW)와, 1 회 기록 가능한 디브이디(DVD-R), 그리고 재생 전용 디브이디(DVD-ROM) 등과 같은 광디스크가 개발 출시되어 상용화되고 있다.Recently, an optical disc capable of recording and storing high quality video data and high quality audio data for a long time, such as a rewritable DVD-RW, a write once DVD-R, and a playback-only DVD ( Optical discs such as DVD-ROM have been developed and commercialized.
한편, 상기 광디스크, 예를 들어 DVD-ROM에 기록된 데이터를 독출 재생할 수 있는 비디오 디스크 플레이어(VDP: Video Disc Player) 등과 같은 광디스크 장치에는, 광디스크에 기록된 데이터를 독출하기 위한 광픽업과, 상기 광픽업에 의해 독출된 신호를 재생신호하기 위한 넓은 의미에서의 VDP 시스템이 포함 구성된다.On the other hand, in an optical disc device such as a video disc player (VDP) capable of reading and reproducing data recorded on the optical disc, for example, a DVD-ROM, an optical pickup for reading data recorded on the optical disc, and A VDP system in a broad sense for reproducing a signal read out by an optical pickup is included.
또한, 상기 광디스크 장치에는, 도 1에 도시한 바와 같이, 트래킹 에러신호에 근거하여, 트래킹 액츄에이터(11)를 구동 제어하기 위한 트래킹 서보 필터(10)와, 슬레드 액츄에이터(13)를 구동 제어하기 위한 슬레드 서보 필터(12)가 포함 구성된다.1, the drive control of the tracking servo filter 10 and the sled actuator 13 for driving control of the tracking actuator 11 on the basis of the tracking error signal are shown in FIG. Sled servo filter 12 is configured to include.
따라서, 비디오 디스크 플레이어 등과 같은 광디스크 장치 내에 DVD-ROM과같은 광디스크가 삽입 안착되는 경우, 통상적인 포커싱 및 트래킹 서보 동작을 수행하게 되는 데, 이때 상기 트래킹 서보 필터(10)에서는, 트래킹 에러신호가 검출되는 경우, 그에 상응하는 트래킹 구동 출력(Tracking Driver Out) 신호를, 상기 트래킹 액츄에이터(11)로 출력하여, 트래킹 에러신호가 발생되지 않도록 제어하게 된다.Therefore, when an optical disc such as a DVD-ROM is inserted into an optical disc device such as a video disc player or the like, a normal focusing and tracking servo operation is performed. In this case, a tracking error signal is detected by the tracking servo filter 10. If so, the corresponding tracking driver output signal is outputted to the tracking actuator 11 to control the tracking error signal not to be generated.
또한, 상기 슬레드 서보 필터(12)에서는, 상기 트래킹 구동 출력 신호에 따라, 상기 슬레드 액츄에이터(13)를 구동 제어하기 위한 슬레드 구동 출력(Sled Driver Out) 신호를, 상기 슬레드 액츄에이터(13)로 출력하여, 정상적인 트래킹 서보 동작이 이루어지도록 한다.Further, in the sled servo filter 12, a sled driver out signal for driving control of the sled actuator 13 is driven according to the tracking drive output signal. ) To allow normal tracking servo operation.
그러나, 일반적인 광디스크 장치에서는, 도 2에 도시한 바와 같이, 광디스크 중심과 실제 회전 중심이 서로 일치하지 않아, 광픽업의 이동 경로가 트랙을 횡단하게 되는 편심(Eccentrical Deviation) 광디스크가 삽입 안착되는 경우에도, 항상 일정한 트래킹 서보 필터(10)의 게인과 슬레드 서보 필터(12)의 게인으로, 상기 트래킹 액츄에이터(11)와 슬레드 액츄에이터(13)를 구동 제어하기 때문에, 광디스크의 편심에 의한 데이터 재생 오류 또는 기록 오류가 발생되는 문제점이 있다.However, in a general optical disc apparatus, as shown in FIG. 2, even when an optical disc center and an actual rotation center do not coincide with each other and an eccentrical deviation optical disc in which the movement path of the optical pickup crosses the track is inserted and seated. Since the tracking actuator 11 and the sled actuator 13 are driven and controlled by the gain of the constant tracking servo filter 10 and the gain of the sled servo filter 12, data reproduction errors due to eccentricity of the optical disc Or there is a problem that a recording error occurs.
따라서, 본 발명은 상기와 같은 문제점을 해결하기 위하여 창작된 것으로서, 씨디(CD) 또는 디브이디(DVD) 등과 같은 광디스크에 기록된 신호를 독출 재생하거나 또는 기록하기 위한 광디스크 장치에서, 장치 내에 삽입된 광디스크의 편심량을 계산한 후, 트래킹 서보 필터 및 슬레드 서보 필터의 게인(Gain)을 가변 조절하기 위한 광디스크 장치에서의 서보 필터 게인 조절방법을 제공하는 데, 그 목적이 있는 것이다.Accordingly, the present invention has been made to solve the above problems, and an optical disc inserted in the apparatus in an optical disc apparatus for reading, reproducing or recording a signal recorded on an optical disc such as a CD or a DVD. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for adjusting a servo filter gain in an optical disc apparatus for variably adjusting gains of a tracking servo filter and a sled servo filter after calculating an eccentric amount of.
도 1은 일반적인 광디스크 장치에 대한 일부 구성을 도시한 것이고,1 shows some components of a general optical disk device,
도 2는 일반적인 광디스크의 편심량에 의해 트랙 횡단이 발생되는 상태를 도시한 것이고.2 illustrates a state in which track crossing is generated by an eccentric amount of a general optical disk.
도 3은 본 발명에 따른 서보 필터 게인 조절방법이 적용되는 광디스크 장치에 대한 일부 구성을 도시한 것이고,3 is a block diagram of an optical disk apparatus to which the servo filter gain adjusting method according to the present invention is applied.
도 4는 본 발명에 따른 광디스크 장치에서의 서보 필터 게인 조절방법에 대한 동작 흐름도를 도시한 것이다.4 is a flowchart illustrating an operation of a servo filter gain adjusting method in the optical disk device according to the present invention.
※ 도면의 주요부분에 대한 부호의 설명※ Explanation of code for main part of drawing
10 : 트래킹 서보 필터11 : 트래킹 액츄에이터10: tracking servo filter 11: tracking actuator
12 : 슬레드 서보 필터13 : 슬레드 액츄에이터12: sled servo filter 13: sled actuator
20 : 트랙 횡단 카운터21 : 회전 검출부20: track crossing counter 21: rotation detection unit
23 : 게인 컨트롤러24 : 편심량 계산부23: gain controller 24: eccentricity calculation unit
상기와 같은 목적을 달성하기 위한 본 발명에 따른 광디스크 장치에서의 서보 필터 게인 조절방법은, 광디스크 삽입시, 트래킹 서보 오프 및 포커싱 서보 온 상태에서, 소정 회전 주기 동안의 트랙 횡단 수를 카운트하는 1단계; 및 상기 카운트된 트랙 횡단 수를 참조하여, 상기 광디스크의 편심량을 계산한 후, 트래킹 서보 필터 및 슬레드 서보 필터의 게인을 가변 조절하는 2단계를 포함하여 이루어지는 것을 특징으로 한다.Servo filter gain control method in the optical disk device according to the present invention for achieving the above object, in the tracking servo off and focusing servo on state when the optical disk is inserted, one step of counting the number of track crossings for a predetermined rotation period ; And calculating the eccentricity of the optical disc with reference to the counted track traverses, and then variably adjusting gains of the tracking servo filter and the sled servo filter.
이하, 본 발명에 따른 광디스크 장치에서의 서보 필터 게인 조절방법에 대한 바람직한 실시예에 대해, 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, a preferred embodiment of the servo filter gain adjusting method in the optical disk device according to the present invention will be described in detail with reference to the accompanying drawings.
도 3은, 본 발명에 따른 서보 필터 게인 조절방법이 적용되는 광디스크 장치에 대한 일부 구성을 도시한 것으로, 예를 들어 비디오 디스크 플레이어(VDP) 등과 같은 광디스크 장치에는, 광디스크에 기록된 데이터를 독출하기 위한 광픽업과, 상기 광픽업에 의해 독출된 신호를 재생신호하기 위한 넓은 의미에서의 VDP 시스템이 포함 구성된다.FIG. 3 shows a part of an optical disk device to which the servo filter gain adjusting method according to the present invention is applied. For example, in the optical disk device such as a video disk player (VDP), the data recorded on the optical disk is read. And a VDP system in a broad sense for reproducing a signal read out by the optical pickup.
또한, 상기 광디스크 장치에는, 도 3에 도시한 바와 같이, 트래킹 에러신호에 근거하여, 트래킹 액츄에이터(11)를 구동 제어하기 위한 트래킹 서보 필터(10)와, 슬레드 액츄에이터(13)를 구동 제어하기 위한 슬레드 서보 필터(12), 그리고 광디스크의 편심량을 측정하여, 트래킹 서보 필터와 슬레드 서보 필터의 게인을 가변 조절하기 위한 트랙 횡단 카운터(20), 회전 검출부(21), 편심량 계산부(22) 및 게인 컨트롤러(23)가 포함 구성된다.3, the drive control of the tracking servo filter 10 and the sled actuator 13 for driving control of the tracking actuator 11 on the basis of the tracking error signal are shown in FIG. A track crossing counter 20, a rotation detector 21, and an eccentricity calculation unit 22 for measuring the eccentricity of the sled servo filter 12 and the optical disc for varying the gain of the tracking servo filter and the sled servo filter. ) And a gain controller 23 are included.
따라서, 비디오 디스크 플레이어 등과 같은 광디스크 장치 내에 편심이 없는 광디스크가 삽입 안착된 경우, 상기 트래킹 서보 필터(10)에서는, 트래킹 에러신호에 상응하는 트래킹 구동 출력 신호를, 상기 트래킹 액츄에이터(11)로 출력하여, 트래킹 에러신호가 발생되지 않도록 제어하게 된다.Therefore, when an optical disc without eccentricity is inserted and seated in an optical disc device such as a video disc player, the tracking servo filter 10 outputs a tracking drive output signal corresponding to a tracking error signal to the tracking actuator 11. Therefore, the tracking error signal is controlled to not be generated.
또한, 상기 슬레드 서보 필터(12)에서는, 상기 트래킹 구동 출력 신호에 따라, 상기 슬레드 액츄에이터(13)를 구동 제어하기 위한 슬레드 구동 출력 신호를, 상기 슬레드 액츄에이터(13)로 출력하여, 정상적인 트래킹 서보 동작이 이루어지도록 한다.The sled servo filter 12 outputs a sled drive output signal for driving control of the sled actuator 13 in accordance with the tracking drive output signal to the sled actuator 13, Ensure normal tracking servo operation.
한편, 상기 광디스크 장치 내에 편심이 있는 광디스크가 삽입 안착되는 경우에는, 상기 광디스크의 편심량를 계산한 후, 그 편심량에 따라 트래킹 서보 필터(10) 및 슬레드 서보 필터(12)의 게인(Gain)을 가변 조절하여, 트래킹 액츄에이터(11)와 슬레드 액츄에이터(13)의 구동을 가변 제어하게 되는 데, 이에 대해 상세히 설명하면 다음과 같다.On the other hand, when an eccentric optical disk is inserted and seated in the optical disk device, after calculating the eccentricity of the optical disk, the gains of the tracking servo filter 10 and the sled servo filter 12 are varied according to the eccentricity. By adjusting, the driving of the tracking actuator 11 and the sled actuator 13 is variably controlled, which will be described in detail below.
도 4는, 본 발명에 따른 광디스크 장치에서의 서보 필터 게인 조절방법에 대한 동작 흐름도를 도시한 것으로, 상기 광디스크 장치에서는, 장치 내에 DVD-ROM 등과 같은 광디스크가 삽입 안착되는 경우(S10), 포커싱 서보 온 및 트래킹 서보 오프 상태가 되도록 한 후(S11), 트래킹 에러신호를 검출하게 된다.4 is a flowchart illustrating a method for adjusting a servo filter gain in an optical disk apparatus according to the present invention. In the optical disk apparatus, when an optical disk such as a DVD-ROM is inserted and seated in the apparatus (S10), a focusing servo is provided. After turning on and tracking the servo off state (S11), the tracking error signal is detected.
한편, 상기 트랙 횡단 카운터(20)에서는, 상기와 같이 트래킹 서보가 오프된 상태에서 검출되는 트래킹 에러신호를 참조하여, 도 2를 참조로 전술한 바와 같이, 광픽업의 이동경로가 트랙을 횡단하는 지를 검출한 후, 그 트랙 횡단 수를 카운트하게 된다.Meanwhile, in the track crossing counter 20, as described above with reference to FIG. 2, the tracking error signal detected when the tracking servo is turned off, the movement path of the optical pickup traverses the track. After detecting the error, the number of track crossings is counted.
그리고, 상기 편심량 계산부(22)에서는, 상기 광디스크가 N 회전하는 소정 회전 주기가 되는 경우(S13), 예를 들어 상기 회전 검출부(21)에 의해 광디스크가 1 회전되었다고 검출되는 경우, 상기 카운트된 트랙 횡단 수와 트랙 피치(Track Pitch)의 곱을 반으로 나눈 값을, 광디스크의 편심량으로 계산하게 되는 데(S14), 상기 트랙 횡단 수는, 트래킹 에러신호에 의해 검출되는 임의의 값이고, 상기 트랙 피치는, 광디스크의 유형에 따라 결정되는 고유의 값이 된다.Then, in the eccentricity calculation unit 22, when the optical disk has a predetermined rotation period of N rotation (S13), for example, when the optical disk is detected that the optical disk has been rotated by one rotation, the counted count is calculated. The value obtained by dividing the product of the track traverse number and the track pitch by half is calculated by the amount of eccentricity of the optical disc (S14), wherein the track traverse number is an arbitrary value detected by a tracking error signal, and the track The pitch is a unique value determined according to the type of optical disc.
한편, 상기 게인 컨트롤러(23)에서는, 상기와 같이 광디스크의 편심량이 계산 완료되는 경우, 그 편심량에 따라 상기 트래킹 서보 필터(10) 및 슬레드 서보 필터(12)의 게인(Gain)을 가변 조절하게 된다(S15).On the other hand, in the gain controller 23, when the eccentric amount of the optical disc is calculated as described above, the gains of the tracking servo filter 10 and the sled servo filter 12 are variably adjusted according to the eccentric amount. (S15).
그리고, 현재까지 오프 상태에 있던 트래킹 서보 동작을 온시켜, 포커싱 서보 동작과 함께 트래킹 서보 동작이 정상적으로 수행되도록 하는 데(S16), 이때 상기와 같은 과정을 통해 게인이 가변 조절된 트래킹 서보 필터(10)로부터 출력되는트래킹 구동 출력 신호는, 상기 트래킹 액츄에이터(11)로 출력되고, 또한 상기와 같은 과정을 통해 게인이 가변 조절된 슬레드 서보 필터(12)로부터 출력되는 슬레드 구동 출력 신호는, 상기 슬레드 액츄에이터(13)로 출력된다.Then, by turning on the tracking servo operation that has been in the off state until now, the tracking servo operation is normally performed together with the focusing servo operation (S16). At this time, the tracking servo filter 10 in which the gain is variably adjusted through the above process. The tracking drive output signal is output from the sled drive output signal output from the sled servo filter 12 whose gain is variably adjusted through the same process as described above. It is output to the sled actuator 13.
따라서, 광디스크의 편심에 의한 데이터 재생 오류 없이, 일반 재생 동작을 정상적으로 수행할 수 있게 된다(S10).Therefore, the normal reproducing operation can be normally performed without data reproducing error due to the eccentricity of the optical disc (S10).
참고로, 상기와 같은 서보 필터 게인 조절동작은, 통상적인 서보 컨트롤러 등과 같은 하나의 구성수단 내에서 소프트웨어적으로 수행될 수 있다.For reference, the servo filter gain adjusting operation as described above may be performed in software in one configuration means such as a conventional servo controller.
이상, 전술한 본 발명의 바람직한 실시예는, 예시의 목적을 위해 개시된 것으로, 당업자라면, 이하 첨부된 특허청구범위에 개시된 본 발명의 기술적 사상과 그 기술적 범위 내에서, 또다른 다양한 실시예들을 개량, 변경, 대체 또는 부가 등이 가능할 것이다.Or more, preferred embodiments of the present invention described above, for the purpose of illustration, those skilled in the art, within the technical spirit and the technical scope of the present invention disclosed in the appended claims below, to further improve various other embodiments Changes, substitutions or additions will be possible.
상기와 같이 구성 및 이루어지는 본 발명에 따른 광디스크 장치에서의 서보 필터 게인 조절방법은, 씨디(CD) 또는 디브이디(DVD) 등과 같은 광디스크에 기록된 신호를 독출 재생하거나 또는 기록하기 위한 광디스크 장치에서, 장치 내에 삽입 안착된 광디스크의 편심량을 계산한 후, 그 편심량에 따라 트래킹 서보 필터 및 슬레드 서보 필터의 게인(Gain)을 가변 조절하여, 트래킹 액츄에이터와 슬레드 액츄에이터의 구동을 가변 제어함으로써, 광디스크의 편심에 의한 데이터 재생 오류 또는 기록 오류를 최소화시킬 수 있게 되는 매우 유용한 발명인 것이다.The servo filter gain adjusting method in the optical disk apparatus according to the present invention constituted and constructed as described above is provided in an optical disk apparatus for reading, reproducing or recording a signal recorded on an optical disk such as a CD or a DVD. After calculating the eccentricity of the optical disc inserted and seated therein, the gain of the tracking servo filter and the sled servo filter is variably adjusted according to the eccentric amount, and the drive of the tracking actuator and the sled actuator is variably controlled to thereby deviate the optical disc. It is a very useful invention that can minimize data reproduction error or recording error.
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