KR0176652B1 - Rotation control device of various optical disk - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

A multi-optical disc player.

2. The technical problem to be solved by the invention

An apparatus for selectively reproducing multiple optical discs provides a multiple optical disc rotation control apparatus for sharing a disc drive control apparatus.

3. Summary of Solution to Invention

A digital phase locked loop for outputting a phase signal which is a clock synchronized with a signal reproduced from an optical disc, a system clock generator for outputting a reference frequency as a reference in driving the disc, and a type of the optical disc to be reproduced. In a multi-optical disc reproducing apparatus having a device for generating a determination signal, the disc drive device for controlling the constant speed of the rotation of the optical disc in advance of the reference frequency and the phase signal and the reproduced data stream based on the disc determination signal. Division or counting with a predetermined value set, and outputting a phase comparison signal and a speed detection signal by comparing the phase and the speed according to the result value, detecting the pulse width of the data stream and outputting the acceleration / deceleration signal according to the present condition. A control signal generator and the phase comparison signal when the phase is locked And outputs the phase comparison signal when the phase detection signal is unlooked for less than a predetermined time, and selects and outputs the acceleration / deceleration signal when the phase is unlocked for a predetermined time or more. Configure.

4. Important uses of the invention

This is implemented to share a redundant circuit in the disc drive control unit of the multi-optical disc reproducing apparatus.

Description

Multi Optical Disk Rotation Control Device

1 is a system block diagram of a conventional rotation control apparatus of an optical disc.

2 is a flowchart showing a control process for the rotation control method of the optical disk according to FIG.

3 is a block diagram of a multi-optical disc selective playback system capable of playing both CD and DVD for carrying out the present invention.

4 is a block diagram showing a disk rotation control apparatus of FIG. 3 according to a preferred embodiment of the present invention.

FIG. 5 is a block diagram illustrating a phase controller of FIG. 4.

6 is a block diagram showing the speed controller of FIG.

7 is a block diagram showing the abnormal rotation control unit in FIG.

* Explanation of symbols for main parts of the drawings

100: digital video disc 120: optical head

140: feed motor 160: disk motor

200: system decoder 300: digital phase locked loop

400: disk drive controller 412: phase controller

414: speed control unit 416: abnormal rotation control unit

500: microcomputer 600: audio / video decoder

700: NTSC encoder 800: digital / analog converter

900: system clock generator 950: ROM decoder

960: Monitor 970: Speaker

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of optical disc reproducing systems, and more particularly, to an apparatus for selectively controlling rotation according to the optical disc in selectively reproducing a plurality of optical discs.

There is typically a spindle motor that rotates the optical disc in playing the optical disc. And there is a disk drive control unit for driving the spindle motor to control the rotational speed of the optical disk.

The optical disc is invented by the same inventor as the inventor of the present invention, and assigned to the present applicant with respect to the apparatus and method for rotation control at a constant linear speed (speed passing over the laser beam during tracking) within a fast time during play No. 93-29059, which discloses in detail. 1 is a diagram showing a system block diagram of a conventional rotation control apparatus of an optical disc. Hereinafter, the operation of the disc rotation control apparatus filed in Patent No. 93-29059 will be briefly described with reference to FIG. 1.

The first phase comparator 11 inputs the first phase comparison signal S1 to generate a phase comparison signal compared with the first fundamental signal. The speed detector 12 inputs the speed comparison signal S2 to generate a speed detection signal. An adder 418 adds the outputs of the first phase comparator 11 and the speed detector 12. The phase controller 10 including the first phase comparator 11, the speed detector 12, and the adder 418 controls the speed and phase when the phase with respect to a constant linear speed of the spindle motor is synchronized.

The second phase comparator 13 receives the second phase comparison signal S3 and compares the phase with the second reference signal to generate an approximate phase comparison signal. In this case, the first and second reference signals may be output from a system clock generator (not shown) of the optical disc reproducing apparatus, and the system clock generator may be implemented as a crystal oscillator.

The first selector 420 selects and outputs the output of the adder 418 and the output of the second phase comparator 13 by the detection signal DS according to the locking / unlocking state of the phase. In this case, the first selector 420 selects the output of the adder 418 when the phase is locked, and selects the output of the second phase comparator 13 when the phase is not locked.

The abnormal rotation detector 15 detects the pulse width of the EFM signal and generates an acceleration / deceleration control signal according to the detection result. Comparator 16 generates an acceleration or deceleration signal by comparing the ratio of the acceleration and deceleration control signals. The abnormal rotation control unit 17 comprising the abnormal rotation detector 15 and the comparator 16 detects the pulse width of the EFM signal by inputting the EFM signal, and determines whether the detected pulse width is greater than or equal to a predetermined value and the deceleration signal when the status is acceleration state. If it is decelerated, it generates acceleration signal.

The selection signal generator 422 inputs the detection signal DS to output the first switching signal, and outputs the second switching signal when the unlocking detection period is longer than a predetermined time.

The second selector 424 selects and outputs the output of the first selector 420 when the first switching signal is input, and selects and outputs the output of the comparator 16 when the second switching signal is input.

2 is a flowchart showing a control process for the rotation control method of the optical disk according to FIG. Hereinafter, the second drawing will be described in detail with reference to the first drawing.

When the play mode is specified in step 1000, the optical disc stopped in the initial stop state rotates in the forward direction. In this case, since a large torque for rotating in the forward direction is required, the acceleration mode for strongly rotating the spindle motor is performed in step 1010. In the initial driving state in which the optical disc starts to rotate to some extent, the phase control mode for controlling the rotation of the optical disc is set in step 1020, since the phase is in a transient state without accurate phase synchronization. Thereafter, the locking of the phase is checked in step 1030, and the phase locking mode is in the phase and phase control mode in step 1040. The adder 418 output of FIG. 1 is output from the second selector to control the spindle motor.

On the other hand, when the phase is unlocked, it is checked in step 1090 whether the unlocking detection period has exceeded n seconds, which is a preset time. That is, the phase control mode is set during the unlocking detection period through steps 1020 and 1030 to synchronize phases. In this case, the first selector 420 of FIG. 1 selects and outputs the output of the second phase comparator 13, and the second selector 424 selects and outputs the output of the first selector 420.

Nevertheless, when the unlocking continues for more than n seconds, the disc drive control unit then determines whether or not the abnormal rotation state. Then, if the pulse width of the EFM signal reproduced in steps 1092-1094 is detected and is larger or smaller than the predetermined pulse width, it is determined that an abnormal rotation state is generated, and when the predetermined pulse width is detected, the phase control mode of step 1020 is performed. .

In addition, the pulse width detection of the EFM signal is performed by counting every half period as a reference clock (T = 1/4321800 sec) having a fundamental frequency of the EFM signal in synchronization with the edge of the reproduced EFM signal, thereby counting the first coefficient value ( 11T) and the second coefficient value 12T which counts one more clock than the first coefficient value to decode the first and second pulse width detection signals. Subsequently, a first sampling signal synchronized with the front end of each cycle and a second sampling signal synchronized with the predetermined period, that is, the front end of the fourth cycle, are issued, and the first and second pulse width detection signals are generated by the first sampling signal. The presence / absence is checked and acceleration or deceleration is determined according to the check result during the four periods by the second sampling signal. Thus, according to the determination result, the next four cycles are kept in the acceleration or deceleration control state.

Thus, when it is determined that the abnormal rotation is in step 1092 and step 1094, the deceleration mode is performed in step 1098 if the motor is accelerated by the current rotation acceleration / deceleration ratio in step 1096, and the acceleration mode is performed in step 1102 if the motor is decelerated. In this case, in FIG. 1, the second selector 424 selects and outputs the output of the comparator 16 by the selection signal generator 422.

After the acceleration / deceleration mode, the stop mode is performed in step 1104, and the step 1104 transitions to step 1010. That is, when an abnormal phenomenon occurs, it can be detected and automatically returned to the normal state again.

As described above, the deceleration mode is set in step 1070 so as to apply reverse torque to the spindle motor rotating in the forward direction in order to stop in a short time as soon as the scope mode is set in step 1060 as described above. In step 1080 a stop mode is performed so that no torque is applied to the spindle motor.

A digital video (or versatile) disc is one of the digital moving picture disc media, and is a next-generation high-definition and high-definition multimedia storage device that stores a digital image of MPEG (Moving Picture Experts Group) 2 for two hours or more. In addition, the compact disc is an optical recording method, which is capable of stably recording a large amount of data, but is a memory device that cannot change the recorded data once. Accordingly, since the digital video disc (DVD) and the known compact disc series are both optical, there are many similarities in the manner of recording and reading out signals. Therefore, when the rotation control apparatus for the multiple optical discs is provided separately according to the DVD and the CD, the circuit having the same structure is required repeatedly. Then, the playback apparatus of the multiple optical discs becomes bulky. This is inefficient in terms of resource usage and results in an economic burden on users.

Accordingly, an object of the present invention is to provide a multi-type optical disc rotation control apparatus for sharing a disc drive control apparatus in a device for selectively reproducing a multi-type optical disc.

In order to achieve the objects of the present invention, a digital phase locked loop for outputting a phase signal, which is a clock synchronized with a signal reproduced from an optical disc, and a system clock generator for outputting a reference frequency as a reference for driving the disc. A disc drive apparatus for controlling a constant speed of rotation of an optical disc, wherein the disc drive device includes a device for generating a disc determination signal by determining the type of the optical disc. The phase signal and the reproduced data stream are divided or counted to a predetermined value, and the phase and the speed detection signal are output by comparing the phase and the speed according to the result value, and the pulse width of the data stream is detected. Drive control signal output to output acceleration / deceleration signal according to the status And the phase comparison signal and the speed detection signal are added when the phase is locked, and the phase comparison signal is output when the phase is unlocked for a predetermined time or less, and the phase is unlocked for a predetermined time or more. When selected, the acceleration and deceleration signal is characterized in that it is composed of a selection output unit for outputting.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that like elements in the figures represent like reference numerals wherever possible.

3 is a block diagram of a multiple optical disc selective playback system according to an embodiment of the present invention.

When the disc 100 is played back, the disc motor 160 starts to rotate at a certain speed. In the optical pickup provided with the head 120, the disc 100 information is converted into an analog high frequency (RF) signal and output. This signal is shaped into a pulse waveform and the data streams (ESM, EFM) are delivered to a digital phase locked loop (hereinafter referred to as a PLL) 300 and a system decoder 200. In this case, the system decoder 200 may be divided into a DVD processing part and a CD processing part. The DVD processing unit processes data read from the digital video disc and the digital video ROM disc (hereinafter referred to as DVD series data). The CD processing unit is a part that processes data read from a compact disc (hereinafter referred to as CD series data). In the system decoder 200, the data stream ESM is demodulated in symbol units consisting of predetermined bits. In other words, the lower (or higher) 16-bit data of the output 32 bits of the data stream ESM is demodulated by converting the data into 8 bits that form one symbol. This is due to the 8-16 modulation (Eight to Sixteen Modulation) when data was written to disc 100. The data at this time is DVD series data.

The data stream EFM is also demodulated in symbol units consisting of predetermined bits. In other words, in the system decoder 200, the lower (or higher) 14 bits of the 23 bits of the output bits are selected and demodulated 14-8. That is, the input 16-bit data is demodulated by converting it into 8 bits that form one symbol. This is due to the 8-14 modulation (Eight to Fourteen Modulation) when data was recorded on the disc 100. The data at this time is CD series data. The system decoder 200 may also use frame synchronization as a standard clock to control the rotation of the disk 100, sector synchronization to distinguish sectors, and error correction timing to find the error correction time point and to read data in the error correction block. The frame synchronization signal Sf, which is a signal for detecting various synchronization patterns, is generated.

The microcomputer 500 is a device control unit which collectively controls the overall operation of the present multi-optical disc reproducing system so as to enable appropriate control according to various types of discs by setting predetermined registers as shown in Table 1 below. When the data transmission start signal is received from the audio / video decoder 600 or the ROM decoder, a transmission control signal is generated.

The digital phase synchronization loop 300 generates a clock synchronized with a signal reproduced from an arbitrary optical disc in consideration of the frequency servo, phase servo, etc. according to the frame synchronization signal Sf.

The disk drive controller 400 includes a phase controller, a speed controller, and an abnormal rotation controller of FIG. 1 to control a constant linear velocity of disk rotation and other disk related operations. In this case, the disc drive control unit 400 controls the processing of the DVD series and the CD series according to the second disc determination signal disc2 provided from the microcomputer 500.

The present invention relates to the disc drive control unit 400 and a detailed description thereof will be described below.

According to the above-described register setting example, if the second disc determination signal disc2 is '1', it is a DVD series, and if it is '0', it is a CD series.

When an audio signal and a video signal are delivered to an AC3 / MPEG audio decoder 630 and an MPEG2 video decoder 620 by a data parser, the audio and video decoders 620 and 620 are transferred to the audio decoder 630 and the video decoder 620, respectively. The demodulated audio and video data are transferred to NTSC (or PAL) encoder 700 and digital / analog converter 800, respectively, and output through monitor 960 and speaker 970, respectively.

The ROM decoder 950 is mainly embedded in a host (eg, a personal computer), and decodes the video signal and the audio signal to perform a playback operation.

4 is a block diagram of the disk rotation control apparatus of FIG. 3 according to a preferred embodiment of the present invention. A description with reference to FIG. 4 is as follows.

The phase controller 412 generates a phase comparison signal C1 by comparing the phase signal S1 of the clock synchronized with the PLL 300 of FIG. 3 with the reference frequency signal Sref in the crystal oscillator implemented by the system clock generator 900. This performs the same operation as the first and second phase comparators 11 and 13 of FIG. However, at this time, the phase controller 412 performs a phase comparison by selectively outputting a divided value according to 1 or 0 of the second disc determination signal to the register from the microcomputer 500.

The speed controller 414 detects the speed of the phase signal S1 and the reference frequency signal Sref and outputs the speed detection signal C2. This performs the same operation as the speed detector 12 of FIG. However, at this time, the speed controller 414 selects a frequency division value based on the second disc determination signal and compares the speed.

The abnormal rotation control unit 416 inputs the EFM signal to detect the pulse width of the EFM based on the reference frequency signal Sref, and outputs the deceleration / deceleration signal C3 according to the pulse width in accordance with the present condition. That is, the abnormal rotation controller 416 outputs a deceleration signal when the current state is in an acceleration state, and outputs an acceleration signal when the deceleration state is in a deceleration state. This performs the same operation as the abnormal rotation control unit 17 of FIG. However, at this time, the abnormal rotation controller 416 of FIG. 4 selects a coefficient value based on the second disc determination signal and compares the speed.

The adder 418 inputs and adds the phase comparison signal C1 and the speed detection signal C2. The first selector 420 inputs a detection signal DS in response to the phase locking / unlocking state as the selection control signal. That is, when the phase is locked, the first selector 420 selects the output of the adder 418, and the phase and speed control mode of step 1040 of FIG. 2 is performed. Meanwhile, when the phase is in the unlocked state, the first selector 420 selects the phase comparison signal C1, and the phase control mode of step 1020 of FIG. 2 is performed.

The selection signal generator 422 inputs the detection signal DS to check the unlocking detection period and outputs an activated selection control signal when a predetermined time is exceeded. The second selector 424 selects the output of the first selector 420 and the acceleration / deceleration signal C3 in response to the selection control signal. That is, the second selector 424 selects and outputs the acceleration / deceleration signal C3 when the selection control signal is activated, and thus steps 1096 to 1102 of FIG. 2 are performed.

The rotation control method for the control flow diagram of FIG. 4 is the same as that of FIG. That is, in the present invention, the phase and speed control modes are performed as in the prior art, but the dividing value and the coefficient value are different by the microcomputer 500 according to the CD / DVD series.

FIG. 5 is a block diagram illustrating a phase controller of FIG. 4. Hereinafter will be described in detail with reference to FIG.

The first divider 41 receives a reference frequency signal Sref from the crystal oscillator 900 and divides it into a predetermined value N1 and outputs the divided frequency. In addition, the second divider 42 inputs the reference frequency signal Sref, divides it into a predetermined value M1, and outputs the divided frequency. Accordingly, the first switching unit 43 connects the first divider 41 to the following phase comparison unit 47 when the CD series data is based on the second disc determination signal, and the second divider 42 when the DVD series data is used. Connect 47 to the phase comparison.

The third divider 44 receives the phase signal S1 from the PLL 300, divides it into a predetermined value N2, and outputs the divided signal. The fourth divider 45 receives the phase signal S1, divides it into a predetermined value M2, and outputs the divided signal. Accordingly, the second switching unit 46 connects the third divider 44 with the phase comparison unit 47 when the CD sequence data is based on the second disc determination signal, and the fourth divider 45 when the DVD sequence data is used. Connect 47 to the phase comparison.

The phase comparator 47 inputs a signal applied from the first switching unit 43 as a reference signal and inputs a signal applied from the second switching unit 46 as a comparison signal to compare phases. The phase comparison signal C1 is then output.

FIG. 6 is a block diagram illustrating the speed controller of FIG. 4. Hereinafter, a description will be given with reference to FIG. 6.

The fifth divider 51 receives the phase signal S1, divides it into a predetermined value N3, and outputs the divided signal. The sixth divider 52 inputs the phase signal S1, divides it into a predetermined value M3, and outputs the divided signal. Accordingly, the third switching unit 53 connects the fifth divider 51 and the pulse width counting unit 57 when the CD sequence data is based on the second disc determination signal.

The seventh divider 54 receives the reference frequency signal Sref, divides it into a predetermined value N4, and outputs the divided frequency. In addition, the eighth frequency divider 55 receives the reference frequency signal Sref, divides it into a predetermined value M4, and outputs the divided frequency. Accordingly, the fourth switching unit 56 connects the seventh divider 54, the pulse width counting unit 57 and the following pulse width changing unit 58 when the CD series data is based on the second disc determination signal. The eighth divider 55 is connected to the pulse width counter 57 and the pulse width changer 59.

The pulse width counting unit 57 inputs the third switching unit 53 and counts the pulse width using the output signal of the fourth switching unit 56 as a reference signal. The pulse width change unit 58 inputting the counted result inputs a reference signal through the third switching unit 56, and when the pulse width is narrow, the pulse H section is short and the pulse L section is changed to be long and the speed detection signal C2 is changed. When the pulse width is wide, the pulse whose H section of the pulse is long and the L section is short is outputted as the speed detection signal C2.

7 is a block diagram illustrating the abnormal rotation control unit in FIG. 4. Hereinafter, a description will be given with reference to FIG. 7.

The first coefficient unit 61 counts the pulse width of the EFM signal to the predetermined value N5 as the reference frequency signal Sref. Also, the second coefficient unit 62 also counts the pulse width of the EFM signal by the reference frequency signal Sref to a predetermined value M5. The fifth switching unit 63 connects the first counter 61 and the next sink presence / absence determining unit 64 when the CD series data is based on the second disc determination signal, and the second counter 62 and the sink when the DVD series data is used. Connect the presence discrimination unit 64.

The sink presence determination unit 64 determines whether there is a sink, and the acceleration / deceleration determination unit 65 outputs an acceleration / deceleration signal C3 according to the presence of the sink.

As described above, the circuit size is reduced by sharing the redundant circuits of the disc drive unit for CD and the disc drive unit for a DVD of a reproduction apparatus for reproducing multiple optical discs.

Claims (3)

A digital phase lock loop for outputting a phase signal, which is a clock synchronized with a signal reproduced from an optical disc, a system clock generator for outputting a reference frequency as a reference for driving the disc, and a type of the optical disc for reproduction. A disc drive apparatus for controlling a constant speed of rotation of an optical disc in a multi-optical disc reproducing apparatus having a device for generating a determination signal, wherein the reference frequency and the phase signal and a data stream reproduced on the basis of the disc determination signal Is divided or counted by a predetermined value, and the phase and the speed are compared according to the result, and the phase comparison signal and the speed detection signal are output, and the pulse width of the data stream is detected to output the acceleration / deceleration signal according to the present condition. A drive control signal generator to compare the phase when the phase is locked Adds and outputs a call and the speed detection signal, outputs the phase comparison signal when the phase is unlocked for less than a predetermined time, and selects and outputs the acceleration / deceleration signal when the phase is unlocked for a predetermined time or more Multiple optical disk rotation control device characterized in that the output unit. The apparatus of claim 1, wherein the driving control signal generation unit divides the reference frequency and the phase signal into predetermined values according to the disc determination signal to compare the phases, and outputs the phase comparison signal; The reference frequency and the phase signal are divided into predetermined values different according to the disc determination signal, the pulse width is counted based on the divided reference frequency, and the pulse width is changed according to the counted result to detect the speed. A speed control unit for outputting a signal, and an abnormal rotation control unit for counting the reference frequency and the data stream to predetermined values according to the disc determination signal, and outputting the acceleration / deceleration signal based on the presence or absence of a sink. Optical disk rotation control device made with. A digital phase locked loop for outputting a phase signal which is a clock synchronized with a signal reproduced from an optical disc, a system clock generator for outputting a reference frequency as a reference in driving the disc, and a type of the optical disc to be reproduced. A disc drive apparatus for controlling a constant speed of rotation of an optical disc in a multi-optical disc reproducing apparatus comprising a device for generating a disc determination signal by determining a type of the optical disc for reproducing a device for generating a determination signal. A phase control unit which divides the frequency and the phase signal into predetermined values according to the disc determination signal, and compares the phase with each other, and outputs a phase comparison signal; and the reference frequency and the phase signal are different according to the disc determination signal. Divide to a predetermined value and refer to the divided reference frequency A speed control unit for counting the pulse width and outputting the speed detection signal by changing the pulse width according to the counted result value, and counting the reference frequency and the data stream to different predetermined values according to the disc determination signal. An abnormal rotation control unit for outputting an acceleration / deceleration signal based on the presence or absence of a sink, an adder for adding the phase comparison signal and the speed detection signal, and a detection signal according to phase locking / unlocking from the digital phase synchronization loop. A first selector which selects and outputs an output of the adder at the time of phase locking, and selects and outputs the phase comparison signal at the time of phase unlocking, and inputs the detection signal to preset the phase unlocking period A selection signal generation section for outputting an activated selection control signal when the time is greater than time; And selecting and outputting the output of the first selection unit when the selected control signal is input, and selecting and outputting the output of the abnormal rotation control unit when the selected selection control signal is input. Multi-purpose optical disk rotation control device.