JPH0973727A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably perform reproducing operation by judging the state that values of addresses read our from a disk are detected by the prescribed number of times or above as a reproduction impossible state and displaying the information that the reproduction of a relevant address area is impossible. SOLUTION: When address information or regenerative data information isn't obtained even though a target address is accessed by the prescribed number of times or above when the information is read out from the optical disk 1, the relevant address is written in (an information contents exclusive memory area) of an information storage memory 8. Alternatively, when a pickup 3 doesn't read in the data from the disk 1 even though while it reproduction operates, the address information judging as (an address prohibition area) is recorded on the information unrecorded area of the disk 1. Further, the information of the contents that (general reproducing information isn't recorded) is recorded on the UTOC area of she disk 1. When the matter that the data aren't read out is judged, the reproduction impossible is displayed on a panel display part 11 to inform a user of a reproduction state.

Description

Detailed Description of the Invention

[0001]

[0001] The present invention relates to an optical disk reproducing apparatus.

[0002]

2. Description of the Related Art In recent years, disk devices for playing a mini disk (hereinafter referred to as MD) capable of recording and reproducing have become widespread. In such a disc device, information such as music information is compressed to about 1/5 and recorded in the MD, and at the time of reproduction, the compressed information read from the MD by the pickup is written in the memory and read from the memory. Decompression processing about 5 times is applied to the compressed information, and predetermined processing such as A / D conversion is performed. Such a method is applied to audio compression technology, ATRAC (Adaptive
TRansform Acoustic Coding).

By recording the compressed information on the MD, the equivalent recording density can be increased five times and the reproduction rate is about five times the writing rate to the memory. By writing the compressed information read from the MD to the memory and storing the reproduction data, even if the situation in which the continuous reading of the data from the pickup is hindered occurs, the memory data is expanded to expand the memory. If data returns to a state in which data can be read again from the pickup before the data disappears, the data can be continuously output.

[0004]

However, in the optical disk device, when accurate data on the disk cannot be read due to scratches or other conditions on the disk, the expected continuous output data can be obtained. There can be no conditions. Alternatively, if incorrect data is obtained when reading the data of the defective portion of the disc, the pickup that reads the information repeatedly reads the same portion in order to read the expected accurate value. A situation may occur in which an abnormal operating condition occurs when trying to read.

The present invention provides an optical disk device capable of confirming that an unreproducible state has occurred by attempting reproduction, and realizing stable reproduction operation thereafter even if the disk has an unreproducible area. The purpose is to provide.

[0006]

An optical disk apparatus according to claim 1, wherein a pickup having a spiral or concentric track on which information is recorded is irradiated with a light beam to read the information. R for extracting the information from the read signal obtained from this pickup
An F amplifier, an error correction unit that corrects an error in the information, a memory that stores the information, a memory control unit that issues a write control signal that writes the information in the memory, and an address value that is read from the disc during reproduction. It is characterized in that it is provided with a control means for judging that the reproduction is impossible when a state detected a predetermined number of times or more and for displaying the information that the reproduction of the corresponding address area or the data group including the corresponding address area is impossible.

Therefore, it can be confirmed by displaying on the information display screen of the disc device that the reproduction of the information of the corresponding address or address area is impossible. The optical disk device according to claim 2, wherein a disk on which information is recorded, the track of which is formed in a spiral shape or a concentric shape, is irradiated with a light beam to read the information, and the read signal obtained from the pickup is used to read the information. An RF amplifier for extracting information, an error correction means for correcting an error in the information, a memory for storing the information, a memory control means for issuing a write control signal for writing the information in the memory, and a read-out from the disc during reproduction. When the address value is detected more than a specified number of times, it is judged that the reproduction is impossible and the corresponding address area or the data group including the corresponding address area cannot be reproduced. Information that is not accessed because it cannot be played back. Characterized in that a control means for recording the data area or data control memory.

Therefore, during the reproducing operation after the above determination, the unrecorded data area of the disk or the unreproducible address area recorded in the data control memory is not accessed.

According to a third aspect of the present invention, in the optical disc apparatus according to the second aspect, the control means records information which is not accessed because the corresponding address area cannot be reproduced in the next reproducing operation, in the recording area of the disk. It is characterized in that the data area is recorded during reproduction of the disc.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. FIG. 1 shows an optical disk device of the present invention. 1
Is an optical disc on which information such as music is recorded, 2 is a spindle motor for driving the optical disc 1 to rotate, and 3 is a pickup, which converges a light beam emitted from a light source (not shown) onto a track of the optical disc 1. It includes an objective lens that focuses, and an objective lens actuator that performs focus servo and tracking servo by changing the attitude of the objective lens. The objective lens actuator generates a light beam and receives the light beam reflected by the optical disc 1. It also contains a light source conversion element that converts it into an electrical signal.

A pickup driving motor 4 moves the pickup 3 in the radial direction of the optical disk 1. The pickup drive motor 4 constitutes a traverse mechanism as a conveying means together with a position detector and other mechanical parts.

Reference numeral 5 is an RF circuit for amplifying the read signal obtained from the pickup 3 and for shaping the waveform and binarizing the read signal, and outputting the focus error signal and the tracking error signal.

Reference numeral 6 inputs a read signal obtained from the RF circuit 5 to detect an edge, detect a CLV control signal, and EF.
The signal processing circuit performs various signal processing such as M demodulation and error correction. The signal processing circuit 6 includes an EFM encoder / decoder 7 which is an error correction means for performing EFM demodulation / error correction, an information storage memory 8 for storing reproduction information and table of contents information of the optical disc 1, and information for the information storage memory 8. It comprises a memory control circuit 9 for writing and reading data, a voice expansion circuit for expanding the band of the information read from the information storage memory 8, and a voice expansion / analog conversion unit 12 for converting a voice output from a digital signal into an analog signal. .

Reference numeral 10 is a CPU as a control means for controlling the entire apparatus, 11 is a panel display section for displaying reproduction information, and 13 is a speaker. Reference numeral 14 denotes a servo control circuit that controls the spindle motor 2 and the pickup drive motor 4 according to a control signal from the CPU 10.

The CPU 10 operates according to the operation flow shown in FIG. 2 in order to write address information or the like to the recording medium or the memory of the disk device when the inaccessible disk area is detected.

The information storage memory 8 is provided with an "information table dedicated memory area" and a "playback information recording dedicated memory area", which are applicable when it is determined that a certain area of the optical disk 1 is unreproducible. The characteristic feature is that the address information of the area is recorded in the memory area dedicated to the information table of contents, and the reproduction operation can be performed by avoiding the access to the corresponding area at the time of reproduction from the next time.

When reading information from the optical disc 1,
If it is determined in # 1 to # 3 that the target information cannot be obtained even if the target address is accessed a specified number of times, the corresponding address area cannot be accessed. Information is written in the "information table dedicated memory area" of the information storage memory 8 in # 6 via # 4 or # 5. Or pickup 3
While the reproducing operation is being performed and the data is not being read from the optical disc 1, the address information determined as the “access prohibited area” is recorded in the information unrecorded area of the optical disc 1. Further, in the area of the optical disc 1 in which the above information is recorded, the information of the content "general reproduction information is not recorded" is recorded in # 7 in the UTOC area of the optical disc 1. However, the above-mentioned information is recorded in the information unrecorded area of the optical disc 1 by a recordable disc medium (hereinafter referred to as M
(O disk) only.

When it is judged that the corresponding address area cannot be accessed and the data cannot be read out, it is displayed on the panel display section 11 that the information (example: music) including the corresponding address cannot be reproduced. , It is possible to inform the user of the reproduction status.

When the corresponding optical disc 1 is reproduced next time, the reproduction is realized by the following procedure. (1) When address information of an inaccessible area is recorded in the memory for exclusive use of the information table of contents The pickup 3 first accesses the TOC area of the optical disk 1 and reads the table of contents information of the optical disk 1 before shifting to the reproducing operation. Then, the information in the information table dedicated memory area of the information storage memory 8 is read. Based on the information of the optical disc 1 (= inaccessible address information) recorded in the information storage memory 8, the CPU 10 performs a process of not reproducing the music including the information of the corresponding address.

However, before the next reading is performed,
When a volatile memory such as a DRAM is used as the information storage memory 8 of the disk device, an operation of turning off the power supply of the information storage memory 8 (power OFF, reset of the disk device) is performed. Then, since the data in the memory is erased, it is necessary to rewrite the information of the "access prohibited area" in the information storage memory 8 in order to realize the above. (2) When address information of the inaccessible area is recorded in the unrecorded data area of the MO disc Before the read operation is started, the pickup 3 first accesses the TOC area of the optical disc 1 and reads the table of contents information of the optical disc 1. Then, the information of the UTOC area and the data area in which the inaccessible address information is recorded is read. At the time of data reproduction, the CPU 10 performs a process of not reproducing the music including the information of the corresponding address.

As described above, when it is determined that the corresponding address area cannot be accessed and the data cannot be read, the CPU 10 instructs the panel display section 11 to display that the reproduction is impossible, and informs the user of the reproduction status. Since it is possible to inform the user, it is possible for the user to confirm that the unreproducible state has occurred.

Further, since the CPU 10 does not reproduce the music including the information of the address determined to be unreproducible in the past based on the information written in the information storage memory 8 or the optical disc 1 to be reproduced, the reproduction is impossible. Even if the optical disc has a different area, a stable reproducing operation can be realized thereafter.

[0023]

As described above, according to the present invention, when the reproduction is attempted and it is determined that the reproduction is impossible, the reproduction status is displayed to the user on the panel display screen, and after the reproduction is judged impossible, It is possible to determine a corresponding address area or a data group including the area as a non-reproducible area, do not access the area thereafter, and avoid a defective reproduction operation area to realize a stable reproduction operation.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of an optical disk device of the present invention.

FIG. 2 is an operation flowchart diagram of a main part of a control unit in the same embodiment.

[Explanation of symbols]

 1 Optical Disc 2 Spindle Motor 3 Pickup 4 Pickup Drive Motor 5 RF Circuit 6 Signal Processing Circuit 7 EFM Encoder / Decoder 8 Information Storage Memory 9 Memory Control Circuit 10 CPU [Control Means] 11 Panel Display Section 12 Audio Expansion / Analog Conversion Section 13 Speaker

Claims (3)

[Claims] 1. A pickup for reading the information by irradiating a disc on which information is recorded with tracks formed in a spiral or concentric shape with a light beam, and the information is extracted from a read signal obtained from the pickup. An RF amplifier, an error correction unit that corrects an error in the information, a memory that stores the information, a memory control unit that issues a write control signal that writes the information in the memory, and an address value that is read from the disc during reproduction. An optical disk device provided with control means for judging that reproduction is impossible when a state detected a predetermined number of times or more and displaying information indicating that reproduction of a corresponding address area or a data group including the corresponding address area is impossible. 2. A pickup for reading the information by irradiating a disc on which information is recorded with spiral or concentric tracks with a light beam, and the information is extracted from a read signal obtained from the pickup. An RF amplifier, an error correction unit that corrects an error in the information, a memory that stores the information, a memory control unit that issues a write control signal that writes the information in the memory, and an address value that is read from the disc during reproduction. It is determined that the state detected more than the specified number of times cannot be reproduced, and the corresponding address area or the data group including the corresponding address area cannot be reproduced. Therefore, the corresponding address area cannot be reproduced in the next reproducing operation. Therefore, the information that is not accessed is the unrecorded data area or the recorded area of the disc. Optical disc apparatus provided with a control means for recording the over data control memory. 3. The control means stores information, which is not accessed because the corresponding address area cannot be reproduced in the next reproducing operation, in the unrecorded data area of the recording area of the disc.
3. The recording method according to claim 2, wherein the recording is performed during the reproduction of the disc.
The optical disk device described.