KR950024184A - Automatic Offset Control of Optical Disc Player - Google Patents

Automatic Offset Control of Optical Disc Player Download PDF

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Publication number
KR950024184A
KR950024184A KR1019940000610A KR19940000610A KR950024184A KR 950024184 A KR950024184 A KR 950024184A KR 1019940000610 A KR1019940000610 A KR 1019940000610A KR 19940000610 A KR19940000610 A KR 19940000610A KR 950024184 A KR950024184 A KR 950024184A
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KR
South Korea
Prior art keywords
latch
signal
output
converter
output value
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KR1019940000610A
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Korean (ko)
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KR960014653B1 (en
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구본호
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이헌조
엘지전자 주식회사
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Priority to KR1019940000610A priority Critical patent/KR960014653B1/en
Publication of KR950024184A publication Critical patent/KR950024184A/en
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Publication of KR960014653B1 publication Critical patent/KR960014653B1/en

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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
    • G11B7/094—Methods and circuits for servo offset compensation
    • 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
    • G11B7/0901—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 for track following only
    • 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
    • G11B7/0908—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 for focusing only

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  • Optical Recording Or Reproduction (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

본 발명은 광 디스크플레이어에서 서보제어에 이용되는 포커스 에러신호와 트랙킹에러신호의 오프셋을 자동으로 조정하는 기술에 관한 것으로, 종래의 오프셋 조정장치에 있어서는 포커스에러와 트랙킹에러의 오프셋 조정을 위해 가변저항으로 사용하게 되는데, 이 가변저항과 연산증폭기등의 부품은 사용시간에 따라 그 특성이 변화되므로 재조정을 해야되는 번거로움이 따르고, 제품 생산단계에서 가변저항값을 조정해야하는 번거로움이 있어 생산성의 저하를 초래하게 되는 결함으로 대두되었는 바, 본 발명은 이를 해결하기 위하여 래치(20),(24)를 통하여 트랙킹에러(TE)의 최대값(EMAX)과 최소값(EMIN)을 찾아낸 후 가산기(26)와 제산기(27)를 통하여 평균값을 구하고, 감산기(28)를 통해 그 평균값과 기준전압 즉, 기준데이타(REF-DATA)의 차값을 구하게 되는데, 이 차값이 바로 트랙킹오프셋값이 되며, 입력되는 트랙킹에러신호 즉, A/D변환기(12)에서 출력되는 트랙킹에러신호에서 상기 감산기(28)의 출력값을 감산하여 이를 래치(30) 및 D/A변환기(31)를 통해 출력하게 한 것이다.The present invention relates to a technique for automatically adjusting the offset of a focus error signal and a tracking error signal used for servo control in an optical disc player. In the conventional offset adjusting device, a variable resistor is used to adjust the offset of a focus error and a tracking error. The parts such as variable resistors and operational amplifiers change depending on the time of use, so they have to be re-adjusted, and there is a need to adjust the variable resistors in the production stage. In order to solve this problem, the present invention finds the maximum value (EMAX) and minimum value (EMIN) of the tracking error (TE) through the latches 20 and 24, and then adds them to the adder 26. And the average value is obtained through the divider 27, and the difference value between the average value and the reference voltage, that is, the reference data REF-DATA, is obtained through the subtractor 28. The difference value becomes the tracking offset value, and the output value of the subtractor 28 is subtracted from the input tracking error signal, that is, the tracking error signal output from the A / D converter 12, and latched 30 and D. It outputs through the / A converter (31).

Description

광디스크 플레이어의 자동 오프셋 조정장치Automatic offset adjuster of optical disc player

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제4도는 본 발명의 자동오프셋 조정부와 제어용 마이크로컴퓨터의 접속관계를 보인 개략도.4 is a schematic diagram showing a connection relationship between an automatic offset adjustment unit and a control microcomputer of the present invention.

제5도는 제4도에서 자동오프셋 조정부의 일실시 예시블록도.FIG. 5 is a block diagram illustrating an automatic offset adjustment unit in FIG. 4; FIG.

제6도의 (가) 내지 (다)는 제5도에서 타이밍신호 발생기의 출력파형도.6A to 6C are output waveform diagrams of the timing signal generator in FIG.

Claims (8)

스위칭 제어신호(SW)의 제어를 받아 광디스크드라이브의 서보제어에 이용되는 포커스에러신호(FE)와 트랙킹에러신호(TE) 중이서 한가지의 신호만을 선택하여 출력하는 아날로그 스위치(11)와, 상기 아날로그스위치(11)에서 출력되는 아날로그신호를 디지탈신호로 변환하는 A/D변환기(12)와, 상기 스위칭제어신호(SW) 및 래치인에이블신호(LE1),(LE2)를 출력하는 타이밍신호 발생기(13)와, 상기 A/D변환기(12)의 출력을 래치하는 제1래치(14)와, 상기 A/D변환기(12)의 출력값에서 상기 제1래치(14)의 출력값을 감산하는 제1감산기(15)와, 상기 래치인에이블신호(LE1)의 제어를 받아 상기 제1감산기(15)의 출력값을 래치하는 제2래치(16)와, 상기 제2래치(16)에서 출력되는 디지탈신호를 아날로그신호로 변환하여 오프셋이 조정된 포커스에러신호(FE’)를 출력하는 제1C/A변환기(17)와, 상기 A/D변환기(12)의 출력값을 래치하는 제3래치(20)와, 상기 A/D변환기(12)의 출력값과 제3래치(20)의 출력값을 비교하여 제3래치(20)의 출력값을 비교하여 제3래치(20)의 출력값이 더 클때 래치신호(LAAT1)를 출력하는 제1비교기(22)와, 상기 A/D변환기(12)의 출력값을 래치하는 제4래치(24)와, 상기 A/D변환기(12)의 출력값과 제4래치(24)의 출력값을 비교하여 그 A/D변환기(12)의 출력값이 작을때 래치신호(LAT2)를 출력하는 제2비교기(25)와, 상기 제3래치(20)의 출력값과 제4래치(24)의 출력값을 가산하는 가산기(26)와, 상기 가산기(26)의 출력값을 2로 나누는 제산기(27)와, 상기 제산기(27)의 출력값에서 기 설정된 기준데이타(REF-DATA)값을 감산하는 제2감산기(28)와, 상기 A/D변환기(12)의 출력값에서 상기 제2감산기(28)의 출력값을 감산하는 제3감산기(29)와, 소정 주기로 공급되는 래치인에이블신호(LE2)에 따라 상기 제3감산기(29)의 출력값을 래치하는 제5래치(30)와, 상기 제5래치(30)에서 출력되는 디지탈신호를 아날로그신호로 변환하여 오프셋이 제거된 트랙킹에러신호(TE’)를 출력하는 제2D/A변환기(31)로 구성한 것을 특징으로 하는 광디스크 플레이어의 자동 오프셑 조정장치.An analog switch 11 which selects and outputs only one signal among the focus error signal FE and the tracking error signal TE used for the servo control of the optical disc drive under the control of the switching control signal SW; An A / D converter 12 for converting an analog signal output from the switch 11 into a digital signal, and a timing signal for outputting the switching control signal SW and the latch enable signals LE 1 and LE 2 . The output value of the first latch 14 is subtracted from the generator 13, the first latch 14 latching the output of the A / D converter 12, and the output value of the A / D converter 12. A first latch 15, a second latch 16 for latching an output value of the first subtractor 15 under the control of the latch enable signal LE 1 , and an output from the second latch 16. A first C / A converter for converting a digital signal to an analog signal and outputting a focus error signal FE 'with an offset adjusted thereto (17), the third latch 20 for latching the output value of the A / D converter 12, and the output value of the A / D converter 12 and the output value of the third latch 20 are compared with each other. The first comparator 22 outputting the latch signal LAAT 1 and the output value of the A / D converter 12 are latched when the output value of the latch 20 is greater by comparing the output value of the latch 20. The fourth latch 24 and the output value of the A / D converter 12 are compared with the output value of the fourth latch 24, and when the output value of the A / D converter 12 is small, the latch signal LAT 2 is applied. A second comparator 25 for outputting, an adder 26 for adding the output value of the third latch 20 and the output value of the fourth latch 24, and a divider for dividing the output value of the adder 26 by two. (27), a second subtractor 28 for subtracting a predetermined reference data (REF-DATA) value from the output value of the divider 27, and the second subtractor from the output value of the A / D converter 12; A third subtractor 29 which subtracts the output value of 28, and at predetermined intervals The fifth latch 30 latching the output value of the third subtractor 29 and the digital signal output from the fifth latch 30 are converted into an analog signal according to the supplied latch enable signal LE 2 . A 2D / A converter (31) for outputting a tracking error signal (TE ') from which an offset is removed. 제1항에 있어서, 아날로그스위치(11)는 상기 타이밍신호 발생기(13)에서 공급되는 스위칭제어신호(SW)에 따라 입력되는 포커스에러(FE), 트랙킹에러(TE)를 시분할적으로 선택하도록 구성한 것을 특징으로 하는 광디스크 플레이어의 자동 오프셑 조정장치.The method of claim 1, wherein the analog switch 11 is configured to time-divisionally select the focus error (FE) and the tracking error (TE) input according to the switching control signal (SW) supplied from the timing signal generator (13). Automatic offset adjustment device for an optical disc player, characterized in that. 제1항에 있어서, 제1래치(14)는 상기 아날로그스위치(11)가 포커스에러(FE)를 선택하고 있는 동안에 외부에 포커스에러오프셋 조정신호(ADJ-FO)가 활성화될때 A/D변환기 (12)의 출력데이타를 래치하도록 구성한 것을 특징으로 하는 광디스크 플레이어의 자동 오프셑 조정장치.The A / D converter (1) according to claim 1, wherein the first latch (14) is operated when the focus error offset adjustment signal (ADJ-FO) is activated externally while the analog switch (11) selects the focus error (FE). 12. An automatic offset adjustment apparatus for an optical disc player, characterized in that it is configured to latch the output data of (12). 제1항에 있어서, 제2래치(16)는 상기 타이밍신호 발생기(13)에서 출력되는 래치인에이블신호(LE1)의 제어를 받아 상기 아날로그스위치(11)가 포커스에러(FE)를 선택하고 있는 기간의 후반부에시 상기 제1감산기(l5)의 출력을 래치하도록 구성한 것을 특징으로 하는 광디스크 플레이어의 자동 오프셑 조정장치.The second latch 16 is controlled by the latch enable signal LE 1 output from the timing signal generator 13 so that the analog switch 11 selects a focus error FE. And an output of the first subtractor (l5) at the end of the period. 제1항에 있어서, 제3래치(20)는 리세트신호(RE)가 공급될때 최대값(EMAX)를 기억하고, 상기 아날로그스위치(11)가 트랙킹에서(TE)를 선택하고 있는 동안에 상기 제1비교기(22)의 출력과 외부의 트랙킹신호오프셋 조정신호(ADJ-TO)가 동시에 활성화될때에만 상기 A/D변환기(12)의 출력을 래치하도록 구성한 것을 특징으로 하는 광디스크 플레이어의 자동 오프셑 조정장치.The third latch 20 stores the maximum value EMAX when the reset signal RE is supplied, and the third latch 20 stores the maximum value EMAX while the analog switch 11 selects TE in tracking. 1 Automatic offset adjustment of the optical disc player, characterized in that the output of the A / D converter 12 is latched only when the output of the comparator 22 and the external tracking signal offset adjustment signal ADJ-TO are simultaneously activated. Device. 제1항에 있어서, 제4래치(24)는 리세트신호(RE)가 공급될때 최소값(EMIN)를 기억하고, 상기 아날로그스위치(11)가 트랙킹에서(TE)를 선택하고 있는 동안에 상기 제2비교기(25)의 출력과 외부의 트랙킹신호오프셋 조정신호(ADJ-TO)가 동시에 활성화될때에만 상기 A/D)변환기(l2)의 출력을 래치하도록 구성한 것을 특징으로 하는 광디스크 플레이어의 자동 오프셑 조정장치.The second latch 24 stores the minimum value EMIN when the reset signal RE is supplied, and the second latch 24 while the analog switch 11 selects TE in tracking. Automatic offset adjustment of the optical disc player, characterized in that the output of the comparator 25 and the external tracking signal offset adjustment signal ADJ-TO are latched only when the output of the A / D converter l2 is simultaneously activated. Device. 제1항에 있어서, 제5래치(30)는 상기 타이밍신호 발생기(13)에서 출력되는 래치인에이블신호(RE2)의 제어를 받아 상기 아날로그스위치(11)가 트랙킹에서(TE)를 선택하고 있는 기간의 후반부에서 상기 제3감산기(29)의 출력을 래치하도록 구성한 것을 특징으로 하는 광디스크 플레이어의 자동 오프셑 조정장치.The method of claim 1, wherein the fifth latch 30 is controlled by the latch enable signal RE 2 output from the timing signal generator 13 so that the analog switch 11 selects TE from tracking. And an automatic offset adjustment apparatus for the optical disc player, characterized in that the output of the third subtractor is latched in the second half of the period. 제1항에 있어서, 제산기(27)는 최하위 비트를 사용하지 않도록 구성한 것을 특징으로 하는 광디크 플레이어의 자동 오프셑 조정장치.The apparatus of claim 1, wherein the divider (27) is configured not to use the least significant bit. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940000610A 1994-01-14 1994-01-14 Auto-offset adjusting apparatus of optical disk player KR960014653B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100326181B1 (en) * 1996-04-25 2002-07-27 삼성전자 주식회사 Method for compensating servo offset
KR100480629B1 (en) * 2002-11-12 2005-03-31 삼성전자주식회사 Track balance adjusting method and apparatus in optical disk player for decreasing the unbalance detecting error of tracking error signal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100326181B1 (en) * 1996-04-25 2002-07-27 삼성전자 주식회사 Method for compensating servo offset
KR100480629B1 (en) * 2002-11-12 2005-03-31 삼성전자주식회사 Track balance adjusting method and apparatus in optical disk player for decreasing the unbalance detecting error of tracking error signal

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