KR950030065A - Digital servo system - Google Patents

Digital servo system Download PDF

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Publication number
KR950030065A
KR950030065A KR1019940009042A KR19940009042A KR950030065A KR 950030065 A KR950030065 A KR 950030065A KR 1019940009042 A KR1019940009042 A KR 1019940009042A KR 19940009042 A KR19940009042 A KR 19940009042A KR 950030065 A KR950030065 A KR 950030065A
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KR
South Korea
Prior art keywords
signal
digital
output
automatic gain
phase compensation
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Application number
KR1019940009042A
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Korean (ko)
Other versions
KR970010938B1 (en
Inventor
이재신
이윤희
김용석
Original Assignee
김광호
삼성전자 주식회사
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Priority to KR1019940009042A priority Critical patent/KR970010938B1/en
Publication of KR950030065A publication Critical patent/KR950030065A/en
Application granted granted Critical
Publication of KR970010938B1 publication Critical patent/KR970010938B1/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
    • G11B7/0941—Methods and circuits for servo gain or phase compensation during operation
    • 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

Landscapes

  • Feedback Control In General (AREA)
  • Control Of Position Or Direction (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

본 발명은 디지탈 서보 시스템을 공개한다. 그시스템은 제어신호에 응답하여 포커스 에러신호와 트랙킹 에러 신호를 소정 크기로 각각 증폭하기 위한 제1, 제2증폭기, 상기 제1, 제2증폭기의 출력신호와 슬래드 에러신호를 선택적으로 출력하기 위한 선택기, 상기 선택기의 출력신호를 디지탈 신호로 변환하기 위한 아날로그/디지탈 변환기, 상기 아날로그/디지탈 변환기의 출력신호의 위상을 보상하고 자동적으로 이득을 조절하기 위한 위상 보상 및 자동 이득 조절기, 상기 위상 보상 및 자동 이득 조절기의 출력신호를 노이즈 정형하고 펄스폭 변조하기 위한 노이즈 정형 및 펄스폭 변조기로 구성되어 있다. 따라서, 포커스 에러신호와 트랙킹 에러신호의 이득을 조절하여 아날로그/디지탈 변환기로 입력함으로써 디지탈 신호로 변환시에 분해능을 향상시켜 정확하게 제어대상을 선택할 수 있다.The present invention discloses a digital servo system. The system selectively outputs the first and second amplifiers, the output signals of the first and second amplifiers and the slad error signal for amplifying the focus error signal and the tracking error signal to a predetermined magnitude in response to a control signal. A selector, an analog / digital converter for converting the output signal of the selector into a digital signal, a phase compensation and an automatic gain adjuster for compensating the phase of the output signal of the analog / digital converter and automatically adjusting the gain, the phase compensation And a noise shaping and a pulse width modulator for noise shaping and pulse width modulating the output signal of the automatic gain regulator. Therefore, by adjusting the gains of the focus error signal and the tracking error signal and inputting them to the analog / digital converter, it is possible to select the control target accurately by improving the resolution at the time of conversion to the digital signal.

Description

디지탈 서보 시스템Digital servo system

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

제2도는 본 발명의 컴팩트 디스크 플레이어의 디지탈 서보 시스템의 블럭도이다. 제3도는 제2도에 나타낸 자동이득 조절기의 회로도이다. 제4도는 제2도에 나타낸 위상 보상 및 자동 이득 조정기의 위상 보상기의 블럭도이다.2 is a block diagram of a digital servo system of the compact disc player of the present invention. 3 is a circuit diagram of the automatic gain regulator shown in FIG. 4 is a block diagram of the phase compensator of the phase compensation and automatic gain adjuster shown in FIG.

Claims (5)

제어신호에 응답하여 포커스 에러신호와 트랙킹 에러신호를 소정 크기로 각각 증폭하기 위한 제1, 제2증폭수단; 상기 제1, 제2증폭수단의 출력신호와 슬래드 에러신호를 선택적으로 출력하기 위한 선택수단; 상기 선택수단의 출력신호를 디지탈 신호로 변환하기 위한 아날로그/ 디지탈 변환수단; 상기 아날로그/ 디지탈 변환수단의 출력신호의 위상을 보상하고 자동적으로 이득을 조절하기 위한 위상 보상 및 자동 이득 조절수단; 상기 위상 보상 및 자동 이득 조절수단의 출력신호를 노이즈 정형하고 펄스폭 변조하기 위한 노이즈 정형 및 펄스폭 변조수단을 구비한 것을 특징으로 하는 디지탈 서보 시스템.First and second amplifying means for amplifying the focus error signal and the tracking error signal to a predetermined magnitude in response to the control signal; Selecting means for selectively outputting output signals of the first and second amplifying means and slad error signals; Analog / digital conversion means for converting the output signal of the selection means into a digital signal; Phase compensation and automatic gain adjusting means for compensating the phase of the output signal of the analog / digital converting means and automatically adjusting the gain; And noise shaping and pulse width modulation means for noise shaping and pulse width modulating the output signal of the phase compensation and automatic gain adjusting means. 제1항에 있어서, 상기 제1, 제2증폭수단은 각각 에러신호를 입력하는 비반전 입력단자를 가진 증폭기; 상기 증폭기의 출력단자와 반전 입력단자사이에 연결된 제1저항; 상기 증폭기의 반전 입력단자와 접지사이에 직렬 연결되고 상기 제어신호에 의해서 스위칭 되는 소정수의 저항과 스위치를 소정수 병렬로 연결하여 상기 증폭기의 이득을 조절하기 위한 이득 조절수단을 구비한 것을 특징으로 하는 디지탈 서보 시스템.2. The apparatus of claim 1, wherein the first and second amplifying means comprise: an amplifier having a non-inverting input terminal for inputting an error signal, respectively; A first resistor coupled between the output terminal and the inverting input terminal of the amplifier; Gain control means for controlling the gain of the amplifier by connecting a predetermined number of resistors and switches connected in series between the inverting input terminal of the amplifier and the ground and switched by the control signal in parallel; Digital servo system. 제1항에 있어서, 상기 위상 보상 및 자동 이득 조절수단의 위상 보상수단은 아래의 식과 같은 입출력전달 특성식을 가지는 것을 특징으로 하는 디지탈 서보 시스템.The digital servo system according to claim 1, wherein the phase compensation means of the phase compensation and automatic gain adjustment means has an input / output transmission characteristic expression as in the following equation. (여기에서, X는 입력신호, Y는 출력신호, K0, K1, K2는 계수값을 나타낸다.)(Where X represents an input signal, Y represents an output signal, and K0, K1, and K2 represent coefficient values). 제1항에 있어서, 상기 위상 보상 및 자동 이득 조절수단의 자동 이득 조절수단은 아래의 식과 같은 입출력전달 특성식을 가지는 것을 특징으로 하는 디지탈 서보 시스템.The digital servo system according to claim 1, wherein the automatic gain adjusting means of the phase compensation and automatic gain adjusting means has an input / output transmission characteristic formula as follows. (여기에서, X는 입력신호, Y는 출력신호, θ는 위상각, g는 전달계수의 절대값을 나타낸다.)(Where X is an input signal, Y is an output signal, θ is a phase angle, and g is an absolute value of the transfer coefficient.) 제1항에 있어서, 상기 노이즈 정형 및 펄스폭 변조수단의 노이즈 정형수단은 아래의 식과 같은 입출력 전달 특성을 가지는 것을 특징으로 하는 디지탈 서보 시스템.The digital servo system according to claim 1, wherein the noise shaping means of the noise shaping and the pulse width modulation means has an input / output transmission characteristic as in the following equation. Y=X+(1-Z-1)QY = X + (1-Z -1 ) Q (여기에서, X는 입력신호, Y는 출력신호, Q는 양자화 오차를 각각 나타낸다.)(Where X is an input signal, Y is an output signal, and Q is a quantization error). ※참고사항: 최초출원 내용에 의하여 공개하는 것임.※ Note: This is to be disclosed based on the initial application.
KR1019940009042A 1994-04-27 1994-04-27 Digital servo system KR970010938B1 (en)

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KR1019940009042A KR970010938B1 (en) 1994-04-27 1994-04-27 Digital servo system

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KR950030065A true KR950030065A (en) 1995-11-24
KR970010938B1 KR970010938B1 (en) 1997-07-02

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100393203B1 (en) * 1996-06-28 2003-11-17 삼성전자주식회사 Method for controlling servo in cd-rom drive
KR100468662B1 (en) * 1996-10-16 2005-04-06 삼성전자주식회사 Analog surveillance system with microcomputer ADC function

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100393203B1 (en) * 1996-06-28 2003-11-17 삼성전자주식회사 Method for controlling servo in cd-rom drive
KR100468662B1 (en) * 1996-10-16 2005-04-06 삼성전자주식회사 Analog surveillance system with microcomputer ADC function

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Publication number Publication date
KR970010938B1 (en) 1997-07-02

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