KR900006362Y1 - Phone and image signal complicating circuit of video disk player - Google Patents
Phone and image signal complicating circuit of video disk player Download PDFInfo
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- KR900006362Y1 KR900006362Y1 KR2019860022344U KR860022344U KR900006362Y1 KR 900006362 Y1 KR900006362 Y1 KR 900006362Y1 KR 2019860022344 U KR2019860022344 U KR 2019860022344U KR 860022344 U KR860022344 U KR 860022344U KR 900006362 Y1 KR900006362 Y1 KR 900006362Y1
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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
- G11B20/22—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing distortions
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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
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10018—Improvement or modification of read or write signals analog processing for digital recording or reproduction
- G11B20/10027—Improvement or modification of read or write signals analog processing for digital recording or reproduction adjusting the signal strength during recording or reproduction, e.g. variable gain amplifiers
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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
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Abstract
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Description
제1도는 본 고안에 따른 블럭도.1 is a block diagram according to the present invention.
제2도는 제1도의 구체회로도2 is a concrete circuit diagram of FIG.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
10 : 픽 업부 20 : DC검출부10: pick-up unit 20: DC detection unit
30 : DC증폭부 40 : RF파형 정형부·30 DC amplifier 40 RF waveform shaping part
본 고안은 비디오 디스크 플레이어 (Video Disk Player : 이하 VDP라 칭한다)의 RF(Radio Frequency : 이하 RF라 칭한다) 신호 출력회로에 관한 것으로 특히 RF신호의 직류(Direct Current : 이하 DC라 칭한다) 성분을 일정하게 유지하며 VDP의 RF신호 재생을 보정할수 있는 회로에 관한 것이다.The present invention relates to an RF (Radio Frequency: hereinafter referred to as RF) signal output circuit of a video disk player (hereinafter referred to as VDP). In particular, the direct current (hereinafter referred to as DC) component of an RF signal is fixed. And a circuit capable of correcting the RF signal reproduction of the VDP.
VDP는 디지탈 신호로 기록되어 있는 디스크로 부터 레이저를 이용하여 주파수 변조된 영상 및 음성신호를 재생하므로 영상 기록 재생 녹화기 보다 양질의 영상과 음성신호를 시청할수 있다. 디스크에 기록되어 있는 디지탈 신호인 영상 및 음성신호는 픽업부에서 주파수 변조된 RF신호로 출력되며 RF신호에는 DC성분이 포함되어 있다.VDP reproduces frequency-modulated video and audio signals from a disc recorded as a digital signal using a laser, so that video and audio signals can be viewed better than video recorders. The video and audio signals, which are digital signals recorded on the disk, are output as frequency-modulated RF signals from the pickup unit, and the RF signals include DC components.
종래에는 DC성분의 변동에 따라 RF신호의 제로크로싱(Crossing)이 일정하지 않아 RF신호 출력에 왜곡된 신호가 발생하는 문제점이 있었다.In the related art, there is a problem in that a distorted signal is generated at an RF signal output because zero crossing of an RF signal is not constant according to a change of a DC component.
따라서 본 고안의 목적은 픽업부에서 읽은 RF신호의 일정한 DC레벨유지로 RF신호를 보정할수 있는 회로를 제공함에 있다.Accordingly, an object of the present invention is to provide a circuit that can correct an RF signal by maintaining a constant DC level of the RF signal read by the pickup unit.
상기 본고안의 목적을 수행하기 위하여 디스크면에 기록된 디지탈 신호를 읽어 RF신호로 출력하는 픽업부와, 상기 픽업부의 RF신호를 입력하여 RF신호중의 DC레벨을 검출하여 출력하는 DC검출부와, 상기 DC검출부의 출력을 입력하여 DC레벨을 증폭하여 출력하는 DC증폭부와, 상기 픽업부의 출력과 DC증폭부의 출력을 입력하여 DC레벨이 검출된 RF신호와 픽업부의 출력 RF신호를 비교하여 정형된 RF신호를 출력하는 RF파형 정형부로 구성함을 특징으로 한다.A pickup unit for reading a digital signal recorded on a disk surface and outputting the RF signal as an RF signal for performing the purpose of the present design, a DC detector for inputting an RF signal of the pickup unit to detect and output a DC level in the RF signal, and the DC A DC amplifier for inputting the output of the detector to amplify the DC level and outputting the RF signal, and the RF signal detected by comparing the output RF signal of the pickup with the output of the pickup and the DC amplifier. It is characterized by consisting of an RF waveform shaping unit for outputting.
이하 본 고안을 도면을 참조하여 설명한다.Hereinafter, the present invention will be described with reference to the drawings.
제1도 본 고안에 따른 블럭도로서, 디스크에 기록되어있는 디지탈 신호를 재생하여 RF신호를 출력하는 픽업부(10)와, 상기 픽업부(10)의 출력인 RF신호를 입력하여 RF신호에 포함되어 있는 DC성분을 검출 출력하는 DC검출부(20)와, 상기 DC검출부(20)의 출력을 입력하여 증폭 출력하는 DC증폭부(30)와, 상기 픽업부(10)와 DC증폭부(30)의 출력을 입력하여 파형을 정형한 후 필터링하여 출력하는 RF파형 정형부(40)로 구성한다.1 is a block diagram according to the present invention, a pickup section 10 for reproducing a digital signal recorded on a disk and outputting an RF signal, and inputting an RF signal output from the pickup section 10 to an RF signal. A DC detector 20 for detecting and outputting the DC component included therein; a DC amplifier 30 for inputting and amplifying and outputting the output of the DC detector 20; and the pickup unit 10 and the DC amplifier 30. RF waveform shaping unit 40 configured to input the output of the) to shape the waveform and then filter the waveform.
상술한 구성에 의거 제1도를 상세히 설명한다. VDP의 디스크를 디지탈 신호로 기록되어 있으므로 VTR보다 신호의 질이 우수하여 양질의 영상과 음향을 재생할수 있으나, 디지탈 신호를 아날로그 신호로 변환하여야만 영상 및 음성 신호로 재생할수 있으므로 픽업부(10)에서 레이저를 이용하여 영상 및 음성신호인 RF신호를 출력한다.Based on the above structure, FIG. 1 is explained in full detail. Since the disk of the VDP is recorded as a digital signal, the quality of the signal is better than that of the VTR, so that it is possible to reproduce high quality video and audio. RF signals, which are video and audio signals, are output using a laser.
상기 픽업부(10)에서 출력된 RF신호는 DC성분을 포함하고 있으며 상기 DC레벨의 변동에 따라 RF신호의 제로 크로싱(Zero Crossing)점이 변화하므로 DC레벨을 일정하게 유지하여 RF신호의 제로크로싱을 본래의 RF파형과 일치시켜야 한다.The RF signal output from the pickup unit 10 includes a DC component, and since the zero crossing point of the RF signal changes according to the change of the DC level, the DC level is kept constant so that the zero crossing of the RF signal is maintained. Match the original RF waveform.
상기 픽업부(10)의 RF신호를 입력하는 DC검출부(20)는 소정의 로우 패스필터(Low Pass Filter)로 DC를 검출하여 출력하며 DC증폭부(30)는 상기 DC검출부(20)의 출력인 DC 성분을 증폭하여 RF파형 정형부(40)에 입력한다.The DC detector 20 inputting the RF signal of the pickup unit 10 detects and outputs a DC with a predetermined low pass filter, and the DC amplifier 30 outputs the DC detector 20. Phosphorus DC component is amplified and input to the RF waveform shaping unit 40.
RF파형 정형부(40)는 상기 픽업부(10)의 RF신호와 DC증폭부(30)의 증폭된 DC레벨을 입력한후 비교하여 RF신호를 정형하고 상기 정형한 VDP신호를 RF신호 대역에 맞게 필터링 한후 정형된 RF 신호를 출력한다.The RF waveform shaping unit 40 inputs and compares the RF signal of the pickup unit 10 with the amplified DC level of the DC amplifying unit 30 to form an RF signal and compares the shaped VDP signal to an RF signal band. After filtering accordingly, the RF signal is output.
제2도는 본 고안에 따른 제1도의 구체 회로도로서, 디스크의 디지탈 신호를 재생하여 RF신호를 출력하는 픽업부(10)와, 상기 픽업부(10)의 출력단이 트랜지스터(Q1)의 베이스에 연결되고 전원단(Vcc)과 트랜지스터(Q1)의 콜렉터 사이에 접속된 저항(R1)과, 상기 트랜지스터(Q1)의 에미터와 접지사이에 접속된 저항(R2)과, 상기 트랜지스터(Q1)의 에미터와 상기 저항(R2)의 접속노드에 캐패시터(C1)가 접속되어 접지되는 동시에 코일(L1)과 캐패시터(C2)가 직렬연결되어 접지되며 상기 픽업부(10)의 RF신호에서 DC성분을 검출하여 상기코일(L1)과 캐패시터(C2)의 접속노드로 출력하게 되는 DC검출부(20)와, 상기 DC검출부(20)의 출력단이 연산증폭기(OP1)의 비반전단(+)에 연결되고 상기 연산증폭기(OP1)의 반전단(-)과 접지사이에 직렬접속된 저항(R4)(R5)과, 상기 두개의 저항(R4-R5)의 접속노드에 저항(R3)이 연결되어 가변저항(VR1)에 접속되며 상기 가변저항(VR1)의 양단에는 전원단(Vcc)와 (-Vcc)가 연결되고 상기 연산증폭기(OP1)의 반전단(-)이 저항(R6)을 통해 연산증폭기(OP1)의 출력단에 접속되도록 하여 상기 DC검출부(20)의 검출된 DC검출 신호를 증폭출력하는 DC증폭부(30)와, 상기 픽업부(10)의 출력단이 저항(R7)을 통해 연산증폭기(OP2)의 비반전단(+)에 접속되고 상기 DC증폭부(30)의 출력단이 저항(R8)을 통해 연산증폭기(OP2)의 반전단(-)에 접속되며 상기 연산증폭기(OP2)의 출력단이 코일(L2)을 통해 출력단(Out)에 연결되고 상기 연산증폭기(OP2)의 출력단과 접지사이에 캐패시터(C3)가 접속되여 출력단(out)과 접지사이에 캐패시터(C4)가 접속되도록 하여 파형을 정형하여 필터링 출력하는 파형정형부(40)로 구성된다.2 is a detailed circuit diagram of FIG. 1 according to the present invention, in which a pickup unit 10 for reproducing a digital signal of a disc and outputting an RF signal, and an output terminal of the pickup unit 10 are connected to the base of the transistor Q1. And a resistor R1 connected between the power supply terminal Vcc and the collector of the transistor Q1, a resistor R2 connected between the emitter of the transistor Q1 and ground, and an emitter of the transistor Q1. The capacitor C1 is connected and grounded at the connection node of the resistor and the resistor R2, and at the same time, the coil L1 and the capacitor C2 are connected in series and grounded, and the DC component is detected from the RF signal of the pickup unit 10. The output of the DC detector 20 and the output terminal of the DC detector 20, which is output to the connection node of the coil (L1) and the capacitor (C2) is connected to the non-inverting terminal (+) of the operational amplifier (OP1) Resistors R4 and R5 connected in series between the inverting terminal (-) of the amplifier OP1 and ground, and the two resistors R4-R5. A resistor R3 is connected to the connection node and is connected to the variable resistor VR1, and both ends of the variable resistor VR1 are connected to a power supply terminal Vcc and (-Vcc), and an inverting terminal of the operational amplifier OP1 ( A DC amplifier 30 for amplifying and outputting the detected DC detection signal of the DC detector 20 by connecting the resistor R6 to the output terminal of the operational amplifier OP1 through the resistor R6, and the pickup unit 10. The output terminal of is connected to the non-inverting terminal (+) of the operational amplifier OP2 through the resistor (R7) and the output terminal of the DC amplifier unit 30 is the inverting terminal (-) of the operational amplifier OP2 through the resistor (R8) The output terminal of the operational amplifier OP2 is connected to the output terminal Out through the coil L2, and the capacitor C3 is connected between the output terminal and the ground of the operational amplifier OP2 so that the output terminal out and ground are connected. The capacitor C4 is connected to each other to form a waveform shaping unit 40 for shaping and filtering the waveform.
상술한 구성에 의거 제2도 구체회로도를 상세히 설명한다.Based on the above-described configuration, a detailed circuit diagram of FIG. 2 will be described in detail.
VDP는 픽업부(40)에서 레이저를 이용하여 디스크면에 기록되어 있는 디지탈 신호를 재생하여 RF신호를 출력 한다.The VDP reproduces the digital signal recorded on the disk surface by using a laser in the pickup section 40 and outputs an RF signal.
그러나 픽업부(10)에서 출력한 RF신호는 DC성분을 포함하고 있으며 DC레벨의 변동에 따라 RF신호가 변화된다. 즉, RF신호가 일정한 DC레벨을 유지하지 못함으로서 주파수 변조된 RF 신호의 제로크로싱점이 DC레벨의 변화에 의해 변동되어 왜곡이 포함된다.However, the RF signal output from the pickup unit 10 includes a DC component, and the RF signal changes according to the change of the DC level. That is, since the RF signal does not maintain a constant DC level, the zero crossing point of the frequency-modulated RF signal is changed by the change of the DC level, thereby including distortion.
상기 픽업부(10)를 출력한 RF신호 일단은 저항(R7)을 통하여 비교기(OP2)의 비반전 단자에 입력하고 또다른 일단의 RF 신호는 트랜지스터(Q1)의 베이스에 인가되어 원 신호의 영향을 줄이기 위해 에미터 플로워방식인 트랜지스터(Q1)의 에미터로 출력하며 상기 트랜지스터(Q1)의 에미터로 출력한 신호는 캐패시터(C1-C2)와 코일(L1)을 통하여 DC를 검출하여 연산증폭기(OP1)의 비반전단(+)에 입력된다. 상기 연산증폭기(OP1)의 반전단(-) 입력은 가변저항(VR1)으로 오프셋(Offset)을 조정한후 저항(R3-R6)으로 DC게인을 결정하게 되므로 상기 연산증폭기(OP1)는 출력단으로 자동증폭된 DC성분을 출력한다.One end of the RF signal output from the pick-up unit 10 is input to the non-inverting terminal of the comparator OP2 through the resistor R7, and another end of the RF signal is applied to the base of the transistor Q1 to influence the original signal. In order to reduce the voltage, the output of the emitter of the transistor Q1, which is an emitter follower, is output to the emitter of the transistor Q1, and the signal is detected through the capacitors C1-C2 and the coil L1 and an operational amplifier. It is input to the non-inverting terminal (+) of (OP1). Since the inverting terminal (-) input of the operational amplifier OP1 adjusts the offset with the variable resistor VR1 and determines the DC gain with the resistors R3-R6, the operational amplifier OP1 is automatically output to the output terminal. Output the amplified DC component.
상기 연산증폭기(OP1)에서 증폭된 DC성분은 저항(R8)을 통하여 비교기 (OP2)의 반전단(-)에 입력하고, 픽업부(10)에서 출력하는 RF신호를 저항(R7)을 통해 비반전단(+)에 입력하는 연산증폭기(OP2)는 상기 두신호를 비교출력하여 파형을 정형한후 뒷단 지연 소자 등의 영향을 고려하여 캐패시터(C3-C4)와 코일(L2)를 통해 필터링하여 VDP신호대역에 맞는 신호를 얻는다.The DC component amplified by the operational amplifier OP1 is input to the inverting terminal (-) of the comparator OP2 through the resistor R8, and the RF signal output from the pickup unit 10 is inverted through the resistor R7. The operational amplifier OP2 input to the front end (+) compares and outputs the two signals to shape a waveform, and then filters through the capacitors C3-C4 and the coil L2 in consideration of the influence of the delay element, etc. Obtain a signal matching the signal band.
상술한바와 같이 VDP에서 픽업에서 출력하는 RF성분중에 포함된 DC성분을 보정하므로서 DC레벨을 일정하게 유지하여 더욱 우수한 음질과 화질을 재생할 수 있다.As described above, the DC level is kept constant by correcting the DC component included in the RF component output from the pickup from the VDP, thereby reproducing more excellent sound quality and image quality.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019860022344U KR900006362Y1 (en) | 1986-12-31 | 1986-12-31 | Phone and image signal complicating circuit of video disk player |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019860022344U KR900006362Y1 (en) | 1986-12-31 | 1986-12-31 | Phone and image signal complicating circuit of video disk player |
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| Publication Number | Publication Date |
|---|---|
| KR880013439U KR880013439U (en) | 1988-08-30 |
| KR900006362Y1 true KR900006362Y1 (en) | 1990-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019860022344U KR900006362Y1 (en) | 1986-12-31 | 1986-12-31 | Phone and image signal complicating circuit of video disk player |
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| KR (1) | KR900006362Y1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020054296A (en) * | 2002-06-08 | 2002-07-06 | 김용호 | two step clean water filter |
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1986
- 1986-12-31 KR KR2019860022344U patent/KR900006362Y1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020054296A (en) * | 2002-06-08 | 2002-07-06 | 김용호 | two step clean water filter |
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| KR880013439U (en) | 1988-08-30 |
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