TW477966B - Playback method and device for a disk - Google Patents

Abstract

Method and device for playbacking a disk are provided wherein the off-center the gravity center offsetting and the fluctuation of a disk are detected in order to set the playback speed. Off-center detection is carried out in step S1-S3. If playback speed in 48 times is available, then forward to fluctuation detection. If not, set playback speed at 32 times. Fluctuation detection is made in step S4-S6. When playback speed in 48 times is obtainable, then go next to gravity center offsetting detection. If not, set playback speed at 32 times. Gravity center offsetting detection is conducted in step S7-S9. If playback speed in 48 times is allowable, set playback speed at 48 times, if not, set at 32 times.

Description

A7 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a reproduction method and a disc reproduction device for reproducing a recorded disc containing eccentricity, surface fluctuate, and weight. [Conventional technology] The compact disk (cD) used for digital audio can be applied to a special memory (CD-ROM) that reads and stores various digital data that can be read by computer equipment. A servo mechanism is provided on such a disc reproduction device for reproducing a CD, and the spiral track recorded on the disc is recorded by a pickup up) to control the disc and the pickup in a correct tracking manner. Fig. 3 is a schematic block diagram showing a disc reproduction apparatus. The recording disc 1 has at least one side, forming a spiral recording track, and digital data is recorded in a predetermined format along the recording track. The spindle motor 2 is driven by a motor driver 3 to rotate the recording disc at a predetermined speed. The motor driver 3 drives the spindle motor 2 to rotate in response to the drive signal rd supplied from the servo control circuit 7, and generates a rotation display t number FG in response to the rotation angle. For example, the rotation display signal FG generates 1 clock every time the recording disc is rotated 60 °, and one rotation produces 6 clocks. The pickup 4 includes a laser light source and a sensor, and is arranged to face the recording extinction surface of the recording disc 1 and can move in the radial direction of the recording disc 1. The actuator 5 supports the pickup 4 and moves the pickup 4 in the radial direction of the recording disc 1 in response to the drive #LD supplied from the servo control circuit. In this way, the pickup 4 reads information recorded on the recording track of the recording disc 1, and takes out a reproduction signal RF corresponding to the recording information. This paper size applies _ National Standard (CNS) A4 specification (210 X 297 mm)

Please read the notes of Φ before filling in. 1 Writing and printing of this page Printed by I. Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs

W7966 A7 _B7 Ψ _ V. Description of the invention (2) The signal processing circuit 6 inputs the reproduced signal M taken out by the pickup 4 to perform waveform shaping and binarization, corresponding to the recording performance of the disc player. Bumps cause bribery with repeated high / low voltage levels. At the same time, the signal processing circuit 6 generates a tracking error W TE indicating that the reading position of the pickup is shifted. This tracking error signal TE, for example, becomes the negative polarity when the pickup 4 maintains the "0" level when the recording position of the recording disc 1 is correctly positioned and shifts to the inside of the recording track. On the other hand, when it is shifted to the outside of the recording ㈣, it becomes positive. Then, the signal processing unit 6 generates a signal indicating that the pickup 4 and the recording disc! The deviation of the reading distance from the focus error signal FE. This focus error signal 错误 ', for example, the pickup 4 maintains the level of "0" when it leaves a proper normal distance. When it is too far away, it becomes a negative polarity. Conversely, when it deviates to the outside of the adjacent recording track, it becomes a positive polarity. Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs, the Consumer Cooperative Cooperative, 4 the service control circuit 7 receives the efm signal of the signal processing unit 6, the tracking error signal TE and the focus error signal FE, and then the motor driver 3 receives the rotation indication signal FG to generate the spindle Motor drive signal RD and actuator ° movement number LD. For example, during clv (constant line speed) control, a drive signal RD is generated to move the motor driver 3 to maintain the frequency of the EFM signal at a predetermined value. At the same time, the tracking error signal TE and the focus error difference No. FE approach "0", and a driving signal for driving the trigger $ is generated [ο. In this way, the spindle servo controlling the recording disc 1, the tracking servo controlling the relative position of the disc 1 and the pickup 4, and the focus servo controlling the distance between the recording disc 1 and the pickup 4, respectively, can be realized. Problems to be Solved by the Invention] § The recorded disc 1 is driven by a hole provided in the central part as an axis, but the >, and Zhang scales are applicable to the CNS A4 size coffee X. ) 2 311681 k Printed by the Consumers ’Cooperative of the Ministry of Economics and Intellectual Property of the Ministry of Economic Affairs A7 V. Invention Description ('Due to discrepancies or deformations during disc manufacturing, the hole is decentered or the center of gravity is deviated from such hole position (eccentricity), The deviation of the center of gravity (eccentricity of the center of gravity) will cause the deviation of the relative position of the recording track 1 of the recording disc 1 and the vibration of the pickup 3, and the vibration during the rotation drive. And, if the recording disc 丨 warps, the recording and the pro-disk When the film 1 rotates, the surface will move. Once this surface vibration occurs, the distance between the recording disc 1 and the pickup 4 cannot be kept constant, which will cause the reading error of the pickup 4. Make the Z record the disc. If the reproduction speed of slice 1 is increased, it is easy to appear The effects of eccentricity, center of gravity, and surface movement of disc 1. Therefore, it is necessary to set the reproduction speed of the pro disc 1 to a plurality of stages. While confirming the effects of eccentricity, eccentricity, and surface movement, Set the playback speed to a range that is not affected by this. [Means to solve the problem] This month, the author is to solve the above problems, and is characterized by a method of reading record information from a recording disc with a spiral recording track. The method includes the steps of detecting the eccentricity of the disc by rotating the disc at the first speed, and detecting the weight of the disc by rotating the disc at a second speed that is faster than the first speed of the disc. Step, the eccentricity detection step is executed when the eccentricity of the disc is within a predetermined reference value; when the eccentricity of the disc is within a predetermined reference value, the rotation speed of the disc is set to be faster than the disc When the eccentricity or the eccentricity of gravity is not within the predetermined value, the rotation speed is higher. Moreover, the disc reproduction device of the present invention is provided with a rotation mechanism for driving the rotation of the recording disc; the recording track recorded on the recording disc is read out The reading of the information from the organization's m-recording track is subject to predetermined processing to obtain the pre-reading; the M's scale is applicable to the Chinese National Standard (CNS) A4 specification (2l0Ti97)

// 306 B7 V. Description of the invention (4) Signal processing circuit of the regenerative signal type; and a control circuit for controlling the operation of the rotation mechanism and the reading mechanism according to the rotation of the signal processing circuit. The control circuit includes an eccentricity detection unit that detects the eccentricity of the recording magnetic disc according to the signal processing circuit, an eccentricity detection unit that detects the eccentricity of the recording disc according to the output of the signal processing circuit, and a rotation mechanism for the rotation mechanism. A rotation control unit for indicating a rotation speed; characterized in that the eccentricity detection unit can be activated in response to the detection result of the eccentricity detection unit;

At this time, the rotation control section instructs the rotation speed of the rotation mechanism based on the detection results of the eccentricity detection section and the eccentricity detection section. The present invention can set the rotation speed to an optimum value in response to the state of the recording disc. In this case, the eccentricity detection is performed first, and the eccentricity detection is performed only when the eccentricity is within a predetermined range, and it is not necessary to perform the above-mentioned detection actions. [Embodiment of the present invention] FIG. 1 is a flowchart for explaining a disc reproduction method of the present invention. In the figure, '' illustrates a case where the disc is driven at 48 or 32 times speed. Printed by the Consumer Affairs Agency of the Intellectual Property Bureau of the Ministry of Economic Affairs. Step 1. The recording disc is rotated at a low speed, for example, at 2000 revolutions per minute, and the information recorded on the recording disc is read by a pickup. In the next 2㈣S2, the eccentricity is detected by the tracking error signal TE obtained from the signal read by the pickup. That is, when the recording disc is eccentric, the tracking error signal TE shows a low-frequency component synchronized with the rotation period of the recording disc, in addition to detecting the high-frequency component of the pickup position shift in a short period. This low-frequency component is taken out to detect eccentricity. And in step 3, it is judged whether the degree of eccentricity detected in step 2 is 'resistance to double-speed regeneration'. This paper size applies the Chinese National Standard (CNS) A4 (210 X 297 mm) — __ 4 31168 ? 477966 "Printed A7 by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. 5. Description of the invention (5) The judgment is based on the second step S2. The low frequency of the signal TL will hurt the TL's large amplitude. Is it within the predetermined reference value? If the maximum value of the low-frequency component TL is within the reference value, go to the next step S4, and if it exceeds the reference value, go to κ step S11. In step S4, the recording disc is rotated at a low speed, and the information recorded in the recording disc is read at this time. At this time, the i-th step from W to ° and the ^ step S4 can be continued to rotate at a low speed. In the following Step 5: s5 is the detection of the surface motion based on the focus error signal fe obtained from the signal read by the pickup. That is, when the recording disc has a crank, the focus error signal π and the eccentricity are detected. Tracking error TE is the same 'appears to sync with recording disc rotation Low frequency components. Therefore, the surface slow motion can be detected by taking out the low frequency components. In addition, it is judged in step S6 whether the degree of surface movement detected in step 4 S4 can withstand 48 times of reproduction. Step 4: Determine whether the maximum amplitude of the low-frequency component flL of the focus error signal FE taken out is within the reference value. If the maximum value of the low-frequency component FL is within the reference value, proceed to step S7, if it exceeds the reference value Then, it proceeds to step S11. Step 7 S7 rotates the recording disc at a high speed, for example, 9600 revolutions per minute, and reads the information recorded on the recording disc with a Yuxun device. In the next eighth step S8 According to the focus error production number FE obtained by the signal read by the pickup, the center of gravity is detected. That is, when the recording disc has the center of gravity, because the recording disc vibrates at high speed, the focus error signal fe A low-frequency component that is synchronized with the rotation period of the recording disc will appear. At this time, this paper size is applicable to the Chinese National Standard (CNS) A4 (210 X 297 mm) 311681

477966 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 __B7__ —_ V. Description of the invention (6) The low-frequency component is used to detect the center of gravity. In addition, it is judged in step S9 whether the degree of center of gravity detected in step S8 can withstand 48 times the speed of regeneration. This determination is made based on whether or not the maximum amplitude of the low-frequency component of the focus error signal FE during high-speed rotation taken in step S8 is within a preset reference value. This low-frequency component FLH is compared with the low-frequency component of the focus error signal FE when rotating at a low speed, and the fluctuation caused by the high-speed rotation of the center of gravity of the recording disc is the largest. Then, if the maximum value of the low-frequency component FLH is within the reference value, it proceeds to step S10; if it exceeds the reference value, it proceeds to step S11. At the tenth step S10, it is determined that the rotation speed of the recording disc is 48 times, and the servo system instructs the rotation speed to complete the processing. That is, only after the eccentric surface slow motion and the eccentricity of the surface are all detected, it is determined that the rotation can be performed at 48 times, and then the process proceeds to step S10. Therefore, even if the recording disc is rotated at 48 times, the surface is not affected by the eccentricity. The influence of sway and focus. At step S11, the rotation speed of the recording disc is determined to be 32 times, and the rotation servo system is instructed to complete the processing. That is, when it is determined that any of the eccentricity, surface movement, and eccentricity cannot be rotated at 48x speed, the process proceeds to step S11, the rotation speed is reduced, and the recording disc is rotated at 32x speed to make the eccentricity The effect of surface movement and center of gravity will not appear. In the above processing operation, if the eccentricity of the recording disc cannot be reproduced at 48 times speed ', the following judgment operations are omitted, and the rotation speed is determined to be 32 times speed. In the same way, if the surface of the recording disc is not correct, the paper size applies the Chinese National Standard (CNS) A4 (210 X 297 public love) 6 (Please read the precautions on the back before filling this page)

477966 、 A7

A7 A7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (8) The drive signal generation unit (not shown) for the motor drive signal RD and the actuator drive signal ld. The RF amplifiers 11 and 12 are connected to the signal processing circuit of the processing pickup, and respectively amplify the tracking error signal TE and the focus error signal FE generated by the signal processing circuit according to the output of the pickup. The eccentricity detection section 13 includes a low-pass filter for reducing the tracking error signal TE, inputted through the RF amplifier u, to the low-frequency component caused by the eccentricity. The surface deterrence detection unit 14 has the same principle as the eccentricity detection unit 13 and includes a low-pass chirp. The focus error signal FE inputted through the lamp amplifier 12 takes out the low-frequency damage FLL caused by the surface motion. The low eccentricity of the eccentricity detecting section i 3 and the surface slow-moving detecting section μ corresponds to the low-speed rotation of the recording disc (for example, 2000 revolutions per minute). The eccentricity detection unit i 5 includes a low-pass waver, and the focus error signal FE input through the amplifier 12 takes out the low-frequency component FLH caused by the eccentricity. The low-pass characteristic of the center-of-gravity detection unit 15 is set in accordance with the high-speed rotation (for example, 98,000 rotations per minute) of the recording disc. The first row break 4 1 6 detects the eccentricity detection unit j 3 and inputs the amplitude of the low-frequency component Ding Qi, determines whether the maximum value is within a predetermined reference value, and instructs the rotation control unit 19 to enable / disable the initial set speed. The second judging unit 17 detects the amplitude of the low-frequency component FLL input from the surface motion detection unit "in the same way as the first judging unit 16 and determines whether the maximum value is within a predetermined reference value, and then instructs the rotation control unit 19 Enable / Disable the initial setting of the rotation speed. The determination units 16 and 17 perform determination when the rotation control unit 19 instructs low-speed rotation. Judgment ^ 1 8 Detects the low frequency input by the eccentricity detection unit j 5 into E Zhang ruler (CNS) A4 specifications (—χ 297 8 311681 ----------------- ---- Order ----- I (Please read the note on the back? Matters before filling out this page} Line 0 · 477966 Product p A7-^ B7 V. Description of the invention (9) (Please read the notes on the back first Fill in this page again) to determine whether the maximum value of ELH is within a predetermined reference value, and then instruct the rotation control unit whether the initial setting of the rotation speed is possible or not. The determination unit 丄 8 rotates the recording disc at a low speed, and The first and second judging sections 16 and 17 determine that they can be rotated at the initial setting of the rotation speed, and the rotation control section 19 judges when the rotation is instructed to rotate at a high speed. The rotation control section 19 supplies a speed designation signal RC to the driving signal generating section, When performing the initial detection action of eccentricity detection and surface deflection detection, set the rotation speed of the recording disc to a low speed (for example, 2000 revolutions per minute), and set the eccentricity detection and surface eccentricity detection to the eccentricity of gravity. When detecting, set the rotation speed of the recording disc to high speed (for example 9800 revolutions). The rotation control section 19 sets the rotation speed of the recording disc according to the determination results of the determination sections 16 to 18. For example, when setting the rotation speed of the recording disc to one of 48 times or 32 times, if all the determination sections 6 If it is judged that 48 times speed can be reached at 8, it indicates the rotation speed corresponding to 48 times speed. If any of the judgment sections 16 to 18 judges that it cannot be 48 times speed, it indicates 32 times speed. Consumption by employees of the Intellectual Property Bureau of the Ministry of Economy Printed by the cooperative company. However, if the rotation speed of the recording disc is set to 3 stages or more, and each detection operation is repeated 2 or more times, the rotation control unit 19 sets the judgment reference value of each of the judgments 16 to 18 to the first. The judgment operation after 2 times is changed in a gradually relaxed direction. Or, the judgment operation after the 2nd time changes the rotation speed of the recording disc, and each detection corresponding to the change of the rotation speed is detected. 1 3 to 1 5 Low-pass characteristics. Therefore, the rotation speed can be judged in multiple stages. Although the above-mentioned embodiment is based on the recording disc's original 48 times speed reproduction 311681 I paper scale application National Standards (CNS) A4 size (21〇 the ^^ -----

Claims (1)

477966 No. 891 1 5843 Patent Application Amendment to Patent Scope (November 30, 1990) A disc reproduction method is a reproduction method for reading recorded information from a recording disc with a spiral recording track. · Make the disc rotate at the jth speed again, according to the step of detecting the eccentricity of the disc according to the low frequency component appearing in the tracking error signal; and rotate at a second speed faster than the aforementioned 丨 speed, according to the appearance of the focus error signal The step of detecting the eccentricity of the disc by the low-frequency component; the eccentricity detection step is performed when the eccentricity of the disc is within a predetermined reference value, and when the eccentricity of the disc is within a predetermined reference value, The rotation speed of the disc is characterized by being set at a higher speed than the rotation speed of the disc when the center of gravity of the disc is not within a predetermined reference value. Printed by the Staff Welfare Committee of the Central Bureau of Standards of the Ministry of Economic Affairs 2. The disc reproduction method according to item j of the scope of patent application, which has the above-mentioned discs rotated at the first speed, and based on the low-frequency component appearing in the focus error signal, The step of detecting the surface eccentricity of the disc is performed when the eccentricity and the surface eccentricity of the disc are within their predetermined reference values; and when the eccentricity of the disc is within the predetermined reference value , Set the rotation speed of the disc to a higher speed than the rotation speed of the disc when the eccentricity or the center of gravity of the disc is not within a predetermined reference value. 3. The flap regenerating method according to item 2 of the scope of patent application, wherein when the above-mentioned eccentricity detection step is performed and the eccentricity of the above-mentioned disc is not within a predetermined reference value, the above-mentioned surface oscillating detection step is omitted. Λ According to the disc reproduction method in item 2 of the scope of the patent application, t, the paper size applies to the eight national standards (CNS) A4 specifications (210X 297 mm) 11 311681 477966 flat Η3 \\) Ό If the surface motion of the disc is not within the pre-referenced value, the eccentric detection step is omitted. 5 · —A kind of disc reproduction device, including: a rotation mechanism that drives the recording disc to rotate, and reads out the information recorded on the recording track of the recording disc; and executes the information read from the recording disc A signal processing circuit that performs predetermined processing to obtain a reproduction signal in a predetermined format; and a control circuit that controls the operation of the rotation mechanism and the readout mechanism according to the output of the signal processing circuit; wherein the control circuit includes a signal processing circuit according to the signal processing circuit The eccentricity detection unit that outputs the eccentricity of the recording disc, the eccentricity detection unit that detects the eccentricity of the recording disc according to the output of the above-mentioned processing circuit, and the rotation control unit that instructs the rotation mechanism to the rotation mechanism, are characterized The eccentricity detection unit is activated according to the detection result of the eccentricity detection unit, and the rotation control unit instructs the rotation speed of the rotation mechanism according to the detection result of the eccentricity detection unit or the eccentricity detection unit. Printed by the Staff Welfare Committee of the Central Standards Bureau of the Ministry of Economic Affairs 6. Kinds of disc reproduction devices, the above-mentioned control circuit includes a surface movement detection unit for detecting the surface movement of the disc according to the output of the signal processing circuit; The eccentricity detection unit is activated based on the detection result of the eccentricity detection unit or the surface eccentricity detection unit, and the rotation control unit is based on the eccentricity detection unit, the surface eccentricity detection unit, or the eccentricity detection unit. The detection result indicates that the rotation speed of the rotating mechanism is characteristic.