KR870000592Y1 - Wave form shaping circuit of compact disk player - Google Patents

Wave form shaping circuit of compact disk player Download PDF

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Publication number
KR870000592Y1
KR870000592Y1 KR2019840014018U KR840014018U KR870000592Y1 KR 870000592 Y1 KR870000592 Y1 KR 870000592Y1 KR 2019840014018 U KR2019840014018 U KR 2019840014018U KR 840014018 U KR840014018 U KR 840014018U KR 870000592 Y1 KR870000592 Y1 KR 870000592Y1
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KR
South Korea
Prior art keywords
shaping circuit
waveform
player
wave form
compact disk
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KR2019840014018U
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Korean (ko)
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KR860008559U (en
Inventor
권태복
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주식회사금성사
허신구
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Priority to KR2019840014018U priority Critical patent/KR870000592Y1/en
Publication of KR860008559U publication Critical patent/KR860008559U/en
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Publication of KR870000592Y1 publication Critical patent/KR870000592Y1/en

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B11/00—Automatic controllers
    • G05B11/01—Automatic controllers electric
    • G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
    • G05B11/40—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining an integral characteristic
    • 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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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Signal Processing (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

내용 없음.No content.

Description

CD플레이어의 파형 정형회로Waveform shaping circuit of CD player

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

제 2 도는 본 고안의 각부 파형도.2 is a waveform diagram of each part of the present invention.

제 3 도는 통상의 CD플레이어에서 디스크 구조와 동작 상태도.3 is a diagram showing the structure and operation of a disc in a conventional CD player.

제 4 도는 다스크 상의 아이(eye)를 레이저광이 추적할때 검출되는 파형이 불균일한 상태를 예시하는 상태도.4 is a state diagram illustrating a state in which a waveform detected when a laser light traces an eye on a dask is nonuniform;

제 5 도는 디스크상의 아이가 균일할때와 불균일할때의 검출 파형도.5 is a detection waveform diagram when the eye on the disk is uniform and uneven.

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

QP : 4분할 포토 다이오드 수광부 출력단 OP1: 증폭기QP: 4-Divided Photodiode Receiver Output Stage OP 1 : Amplifier

N1,N2: 반전 게이트 OP2: 적분기N 1 , N 2 : inverted gate OP 2 : integrator

본 고안은 CD플레이어에서 디스크의 제작시의 편차나 먼지, 지문, 흠에 의해서 아이 패턴이 불균일할때 이를 보정하여 정확한 아이패턴의 중앙을 맞추도록 하는 회로에 관한 것이다.The present invention relates to a circuit for correcting the eye pattern when it is uneven due to variation, dust, fingerprints or flaws in the manufacture of a disc in a CD player so as to center the correct eye pattern.

일반적인 CD플레이어는 제3도와 같이 디스크 이면의 요철면에 레이저를 투사하여 그 정보를 얻어내고 있다. 또, 디스크는 12cm의 평면에 수많은 돌기의 유무로 나선형 트랙으로 구성되어 있다.A general CD player obtains the information by projecting a laser onto the uneven surface behind the disk as shown in FIG. In addition, the disk is composed of spiral tracks with or without a large number of projections in a plane of 12 cm.

이 트랙을 레이저 광선이 추적하면 제4도와 같은 파형이 얻어지고 레이저 빛이 디스크면에 반사되어 4분할 포토 다이오드에 수광된 값을 전부 더해주면 제5도와 같은 파형이 얻어진다.When the laser ray tracks this track, a waveform as shown in Fig. 4 is obtained, and when the laser light is reflected on the disk surface and all the received values are added to the quad split photodiode, a waveform as shown in Fig. 5 is obtained.

이 파형은 각종의 데이타를 얻어내는 정보로 곤의수 또는 연주시간이라든가 종료 시간을 얻고, 각 동기펄스 및 청취할 수 있는 음으로 재생되는 것이다.The waveform obtains various data and obtains the number of strokes, the playing time, or the end time, and reproduces each sync pulse and audible sound.

이러한 CD플레이어에 있어서 종래에는 디스크상에 흠이 나거나 먼지, 지문등에 의해 제5(b)도처럼 파형이 불균일해지고 동작이 불안정하므로 각종 신호를 옳바로 얻어내는데는 많은 어려움이 뒤따른다는 문제점이 있었다.In such a CD player, there is a problem in that the waveform is uneven and the operation is unstable as shown in FIG.

본 고안은 종래의 이러한 문제점을 개선하고자 안출한 것인데, 이는 상기와 같은 불안정시 파형 보정을 위한 회로를 제공하므로써 이러한 장치의 신뢰성을 향상시키려는 목적이 있는 것이다.The present invention has been made to solve such a problem in the related art, which is intended to improve the reliability of such an apparatus by providing a circuit for correcting waveforms when unstable as described above.

이하에서 이를 상세히 설명하면 다음과 같다.This will be described in detail below.

제1도와 같이 4분할 포토다이오드 수광부 출력단(QP)에 컨덴서(C1)를 거쳐 연산증폭기(OP1)의 반전단자(-)를 연결한다.As shown in FIG. 1 , the inverting terminal (−) of the operational amplifier OP 1 is connected to the output terminal QP of the four-split photodiode receiving unit through the capacitor C 1 .

이 연산증폭기(OP1)출력은 반전게이트(N1,N2)를 거쳐 반전게이트(N3)와 저항(R8)에 연결되며, 이 저항(R8)은 적분기(OP3)의 반전단자(-)에 연결된다.The operational amplifier (OP 1) the output is inverted gate (N 1, N 2) through a coupled to the inverting gate (N 3) and the resistor (R 8), this resistance (R 8) is the reverse of the integrator (OP 3) It is connected to the terminal (-).

이 적분기(OP3)출력은 다시 연산증폭기(OP1)의 비반전단자(＋)로 궤환되는 연결 구성을 가지며, 적분기(OP3)의 비반전단자(＋)는 저항(R9,R10), 컨덴서(C3)에 의한 직류전원을 가하는 구성이다.This integrator (OP 3 ) output is connected back to the non-inverting terminal (+) of the operational amplifier (OP 1 ), and the non-inverting terminal (+) of the integrator (OP 3 ) is the resistance (R 9 , R 10). ) And a DC power supply using a capacitor (C 3 ).

미설명 부호 R4,R5,R6,R11은 각기 전압분배 및 바이어스저항 R11,C2는 적분용 컨덴서, 저항이다.Reference numerals R 4 , R 5 , R 6 , and R 11 are voltage distribution and bias resistors R 11 and C 2 are capacitors and resistors for integration.

이러한 구성의 본 고안은 CD플레이어의 디스크에서 검출된 정보는 4분할 포토 다 이오드 수광부 출력단(QP)으로 제2(a)도와 같이 나타나고 이는 연산증폭기(OP1)에 의해 증폭되어 제2(b)도와 같이 된다.According to the present invention of such a configuration, the information detected from the disc of the CD player is shown as the second division (a) as the quad split photodiode light receiving unit output stage (QP), which is amplified by the operational amplifier OP 1 and the second (b). Becomes like help

이를 반전게이트(N1,N2)로 정형시키면 제2(c)도와 같이 되고 이를 적분기(OP2)로 적분해서(제2(d)도파형) 상기 연산증폭기(OP1)의 비반전단자(＋)로 궤환시킨다.When this is shaped into the inverting gates N 1 and N 2 , it becomes like the second (c) diagram and is integrated into the integrator OP 2 (second (d) wave form) so that the non-inverting terminal of the operational amplifier OP 1 is formed. Return to (+).

이때 DC전압은 파형이 불균일할때 생기는 에터전압이므로 이 전압으로 연산증폭기(OP1)의 궤환입력 바이어스를 걸어주므로 파형을 중앙으로 접근시키게 되는 것이다. 즉, 4분할 포토다이오드에서 불균일한 파형이＋쪽으로 나타나면, 입력 바이어스 －를 걸어주고, 반대로 포토다이오드에 불균일한 파형이 ＋로 나타나면 연산증폭기(OP1)의 입력 바이어스를 －로 하므로써 결국 출력은 항상 아이패턴의 중앙점으로 오게되므로써 디스크상에 기록되어 있는 정보를 이상없이 감지하게 되는 것이다.At this time, the DC voltage is the ether voltage generated when the waveform is non-uniform, so that the feedback input bias of the operational amplifier OP 1 is applied to this voltage, thereby approaching the waveform toward the center. That is, if the non-uniform waveform in the 4-divided photodiode appears to + side, the input bias is applied to-, and if the non-uniform waveform to the photodiode is +, the output bias is always negative by setting the input bias of the operational amplifier (OP 1 ) to-. By coming to the center point of the eye pattern, the information recorded on the disk can be detected without any problem.

이로한 본 고안은 CD플레이어에서 디스크상의 흠점으로 인한 검출 파형의 불안정을 안정한 상태로 보정시켜 주게 되어 이러한 장치의 신뢰성을 향상 시키게 되는 유익한 특징이 있는 것이다.This invention has a beneficial feature to improve the reliability of such a device by correcting the instability of the detection waveform due to a defect on the disc in the CD player to a stable state.

Claims (1)

CD플레이어의 4분할 포토다이오드 수광부 출력단(QP)에 증폭기(OP1)를 연결하고, 이의 출력을 반전게이트(N1,N2)로 정형한후 적분기(OP2)를 거쳐 상기 증폭기(OP1)의 또 다른 단자에 궤환시키는 구성을 특징으로 하는 CD플레이어의 파형 정형회로.The amplifier OP 1 is connected to the output terminal QP of the four-segment photodiode receiving unit of the CD player, and the output thereof is formed by the inverting gates N 1 and N 2 , and then through the integrator OP 2 , the amplifier OP 1. A waveform shaping circuit for a CD player, characterized by a configuration for feeding back to another terminal.
KR2019840014018U 1984-12-26 1984-12-26 Wave form shaping circuit of compact disk player KR870000592Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019840014018U KR870000592Y1 (en) 1984-12-26 1984-12-26 Wave form shaping circuit of compact disk player

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR2019840014018U KR870000592Y1 (en) 1984-12-26 1984-12-26 Wave form shaping circuit of compact disk player

Publications (2)

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KR860008559U KR860008559U (en) 1986-07-28
KR870000592Y1 true KR870000592Y1 (en) 1987-02-21

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KR2019840014018U KR870000592Y1 (en) 1984-12-26 1984-12-26 Wave form shaping circuit of compact disk player

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KR860008559U (en) 1986-07-28

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