JP2543232Y2 - Disk TOC reading device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk TOC reading device, and more particularly to a disk TOC reading device for CD-DA, CD-WO and CD-MO disks. It relates to a TOC reading device. 2. Description of the Related Art In a CD-DA, spindle servo control is performed based on an EFM signal obtained from a disk via a pickup, and a TOC (Table) in a lead-in area is controlled.
ofContents) data. In a CD-WO (Write Once) that can be written only once, ATIP (Absolute Time InPregroo
ve) Spindle servo control is performed based on a wobble signal obtained via a pickup from a pregroove formed by FM-modulating data. When writing the TOC of CD-DA and CD-WO, if the discrimination between them is not performed, if the reading process is not performed, the spindle control is not performed, and the disk rotation state becomes unstable due to the influence of noise. Therefore, it takes a long time to write TOC data. [0003] The applicant of the present application first performs TOC information reading operation on a CD-WO disc, and
-After it is determined that the disc is not a WO disc, the CD-DA
Write the TOC information on the disc for
-DA and CD-WO discs are proposed to read TOC information quickly. [0004] As described above, the proposed TOC reading apparatus for a disc uses a CD-DA and a C-DA.
D-WO can be read, but CD-MO
However, it could not be applied to a recordable device. Also CD
When the DA disk is rotated in the WOBBLE mode, a lock signal may be output, in which case it is determined that there is no disk ("nodisc"). [0005] Therefore, the purpose of this invention is to make CD-DA,
An object of the present invention is to provide a TOC reading device that enables TOC reading of a CD-WO and a CD-MO disk. [0006] In order to solve the above-mentioned problems, a TOC reading device according to the present invention comprises a first processing means for performing a TOC reading operation process on a disk whose rotation can be controlled in WOBBLE mode; After the processing by the first processing means, a second processing means for performing a TOC reading operation processing on a disk which can be controlled only in the EFM mode. In this invention, after performing TOC reading operation processing on a disk whose rotation can be controlled in WOBBLE mode,
TOC for discs that can be controlled only in EFM mode
By performing the reading operation process, C
TOC reading of D-DA, CD-WO and CD-MO discs is enabled. Next, this invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a disk TOC reading device according to the present invention. CD-W
The O, CD-DA or CD-MO disc 1 is driven and rotated by a motor 2. The pickup 3 is arranged close to the disk 1 and records data on the disk 1 and reads data from the disk 1. The pickup 3 is controlled to be moved in the radial direction of the disk by a thread motor 4. The output from the pickup 3 is sent to a circuit similar to a normal CD player including an RF amplifier 8, a servo circuit 10 for controlling focus servo and tracking servo, and an EFM decoder circuit 14. E
The FM decoder processing circuit 14 and the servo circuit 10 have a CPU
15. The EFM decoder processing circuit 14 generates a subcode such as demodulation of recording data and time information, generates a rotation control signal for controlling the rotation of the motor 2 using the data from the disk 1, and sends it to the motor controller 9. I do. The motor controller 9 is controlled by a rotation control signal from the ATIP demodulation circuit 11 and a tracking error signal supplied via the RF amplifier 8 in addition to the digital signal processing circuit 12. The data to be written to the disk 1 is EFM
The signal is EFM-modulated by the encoder 6 and input to the laser modulation circuit 7. The laser modulation circuit 7 includes an EFM encoder 12
And controls the recording intensity of the laser incorporated in the pickup 3 to control the recording of data on the disk 1 and the reproduction control. The EFM encoder 12 uses C
The recording data is converted into a CD format under the control of the PU 15. The ATIP demodulation circuit 11 includes the RF amplifier 8
And demodulates ATIP data (absolute time data increasing from the inner circumference to the outer circumference of the disk) from the data signal received via the CPU, and supplies the demodulated signal to the motor controller 9 and the CPU 15 as described above. The write data is input to the EFM encoder 12, and under the control of the CPU 15, performs EFM modulation based on the sub-code sent from the sub-code controller 13, and switches the switch SW
Is input to The changeover switch SW is controlled by a changeover control signal from the CPU 15, and supplies modulation data from the EFM encoder 12 to the magnetic field modulation circuit 6 and the laser modulation circuit 7. The magnetic field modulation circuit 6 performs magnetic field modulation on the received EFM modulation data, and sends the output to the magnetic head 5. The laser modulation circuit 7 similarly performs laser modulation and writes information on the disk 1 via the optical pickup 3. Thus, CD-DA, CD-W
Recording and reproduction are possible for O and CD-MO discs. The operation and processing in the embodiment shown in FIG. 1 will be described with reference to FIGS. First, when the disc is placed on the tray and the tray is closed (step S1), the pickup is moved to the lead-in position (step S1).
2). Next, change the rotation control mode of the spindle motor to WOBB.
The mode is switched to the mode based on the LE signal (step S3). Then, a focus search is performed (step S4). If the focus is achieved, the process proceeds to step S7. If the focus is not achieved, it is determined that there is no disc or that there is no foreign substance because there is a foreign substance (step S6). When the focus is applied, the spindle motor is accelerated (step S7), tracking servo is applied (step S8), and spindle servo is applied (step S9). Since the wobble mode is set in step S3, the wobble mode and EF in step S10 are set.
After the determination of the M mode, the process proceeds to S11, and it is determined whether or not the spindle motor locks (WOBBLE lock). If it is determined that the disc is not locked, CD-W
Since the disc is not O, CD-MO, the motor control mode is switched to the EFM mode (step S12),
In most cases, since the disc is a CD-DA disc, the brake is applied and decelerated by the EFM signal (step S13). Then, it is determined in step S whether or not the motor speed has sufficiently decreased.
If it is determined in step 14 that the motor has fallen sufficiently, the process returns to step S7 to accelerate the motor and apply various servos. In step S10, since the EFM mode is determined in this case, the process proceeds to step S15 to confirm that the motor servo is locked. If not locked, the process proceeds to step S6, where no disc is set. If it is determined in step S15 that it is locked, the feed motor servo is activated (step 16), and it is confirmed that the Q code can be read. If it cannot be read, no dis
c. If you can read it, check the TN of the Q code to confirm that the place you are currently reading is lead-in.
It is confirmed that O is 00 (step S19). On the other hand, if it is determined in step S19 that the vehicle is not in the area, the pickup is returned (step S2).
0), repeat the process until it enters the lead-in area. In step S19, when it is confirmed that the player has entered the lead-in area, it is determined whether the disc type is CD-DA or CD-MO based on the Q code information in the lead-in area (step S21). In this case, the lock was not performed in the WOBBLE mode.
To read the TOC of the CD (step S2).
3). When the WOBBLE is locked in step S11, the feed motor is turned on (step S2).
4) Confirm that the ATIP code can be read (step S25). Here, if the data cannot be read, a WOBBLE lock signal may be generated even in the CD-DA. In order to avoid a malfunction, the mode is set to the EFM mode, the process returns to the step S4, and the same routine as described above is performed. By doing this, when CD-DA is played, no
Discs can be prevented. Step S2
If it is determined in step 5 that the ATIP code can be read, the AT
Read the IP code and move the pickup (Step S
27 to Step S30). If it is determined in step S29 that the vehicle has entered the reit-in area, it is confirmed whether EFM lock is to be performed (step S31). If not locked, the disc is a recordable CD-WO disc, and the WO disc information is read from the ATIP code (step S3).
2), PMA position search based on this information (step S3
If 3) is performed and it is determined that the EFM is present in the PMA (step S34), the TOC information is read because the disk is a partially recorded disk (step S35,
S36). If it is determined that the disk is not locked within a predetermined time (step S37), it is determined that the disk is a CD-WO unrecorded disk (step S38). If it is determined in step S31 that the EFM lock is to be performed, the process proceeds to step S17. Here, since the recorded disk of the CD-WO is a CD-MO disk, the process proceeds to step S21. If the MO is MO, the code Q indicates that it is MO. Information is read (steps S39 to S41). If it is WO, the process proceeds to step S22. The CD-MO disc has pits in the lead-in area in the same manner as the CD-DA, and information is carved. In this invention, discrimination is made from a disk operating in the WOBBLE mode, so that a disk without an EFM signal such as a CD-WO unrecorded disk does not move in the EFM mode, and the operation is stabilized. Also, when a CD-DA disc is inserted, it will move in WOBBLE mode, but after the spindle motor accelerates, it will not be locked and even if it rotates at high speed, immediately after that it will switch to EFM mode and easily apply brakes Therefore, the next operation can be stably performed. In addition, even if the WOBBLE lock signal is detected even though the disc is a CD-DA disc, since the EFM mode is set again later and the TOC reading operation is performed,
The TOC reading operation of the CD-DA disk does not fail. Further, no special detection mechanism is required for performing these operations. As described above, according to the TOC reading apparatus for a disk according to the present invention, CD-DA, C
The TOC data of D-WO and CD-MO discs can always be read accurately.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration block diagram showing an embodiment of a disk TOC reading device according to the present invention. FIG. 2 is a flowchart showing an operation processing procedure in the embodiment of FIG. 1; FIG. 3 is a flowchart showing an operation processing procedure in the embodiment of FIG. 1; FIG. 4 is a flowchart showing an operation processing procedure in the embodiment of FIG. 1; [Description of Signs] 1 Disc 2 Motor 3 Pickup 4 Thread motor 5 Magnetic head 6 Magnetic field modulation circuit 7 Laser modulation circuit 8 RF amplifier 9 Motor controller 10 Servo circuit 11 ATIP decoder 12 EFM encoder 13 Subcode controller 14 EFM decoder 15 CPU

Claims (1)

(57) [Claims for utility model registration] TOC for disks that can be controlled in WOBBLE mode
A first processing unit for performing a reading operation process, and a second processing unit for performing a TOC reading operation process on a disk controllable only in the EFM mode after the processing by the first processing unit.
A TOC reading device for a disk, comprising: