JPH06176474A - Optical disk reproducing device - Google Patents

Abstract

PURPOSE:To improve a function without increasing costs by making the reproduction of recorded information possible by a track jump function using the software of a built-in microcomputer. CONSTITUTION:When the reading of TOC information is impossible within a specified period of time because of a damage to a disk 11 and eccentricity, the first piece of recorded music information is forcibly sought by the controlling of a microcomputer 15 and displayed on an information display section 17. In this condition, when the same track is repeatedly reproduced by an optical pick-up 1 because of the damage to the disk 11, this is detected by the microcomputer 15 and the pick-up 13 is track-jumped to the outer periphery of the disk 11. Then, whether this position is normally reproduced or not is identified and when the normal reproduction is possible, it is continued. Also, when it is abnormal, it is further track-jumped and moved and when the normal condition is reached within a specified period of time, the reproduction is carried out up to the last recorded information, a read out area is detected by the microcomputer 15 and the reproduction is stopped. When the normal condition is not reached within the specified period of time, the reproduction is stopped as a read out operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk reproducing apparatus, and more particularly to an optical disk reproducing apparatus suitable for forcibly starting a reproducing operation of a disk outer peripheral track when reproduction cannot be performed due to scratches on the disk.

[0002]

2. Description of the Related Art Conventionally, an optical disk reproducing device, for example, a CD player, irradiates a disk on which information such as music is recorded with light from an optical pickup, receives reflected light from a recording surface of the disk, and receives an RF modulated signal. Audio signals such as music were reproduced by demodulation and signal processing.

In the above-mentioned reproduction of music and the like, generally, TOC (Table Of Contents) information recorded on a disc is read by the optical pickup and displayed on a display unit, and the user confirms the displayed TOC information. The TOC information was used to find and play the desired music.

The operation of reading TOC information and the operation of reproducing recorded information in the conventional optical disk reproducing apparatus will be described with reference to the flowchart shown in FIG. TO recorded on the disc
The C information is read by the optical pickup and the TOC
Judge whether all the information has been read (step S2
0) When the reading of all TOC information is completed, the track number (TNO) desired to be reproduced is designated from this TOC information, the TNO of the designated record information is searched, and the reproduction is started (step S23). When this disc playback is started, the read information of the optical pickup is displayed on the display unit (step S24), all the recorded information is played back in order of predetermined information to detect the lead-out area (step S25), and playback is performed. It ends (step S26).

On the other hand, when the TOC information cannot be read within a predetermined time due to scratches on the disc (steps S20, S21), the reproduction operation of the optical disc reproducing apparatus is stopped and the information is reproduced. Can not (step
S26).

As described above, based on the read data of the TOC information of the disc, the user finds the desired music information and reproduces it in order.

[0007]

However, in the above-mentioned conventional optical disk reproducing apparatus, when the TOC information is read and the recorded information such as music is reproduced, scratches (scratch-like scratches or scratches on the TOC information recording portion of the disk are generated. If some data cannot be read due to concentric scratches, etc., this disc is judged as a defective disc and cannot be reproduced even if the recorded data area of the recorded information is normal. there were.

Also, while the TOC information is read and the recorded information such as desired music is reproduced on the disc, there is a scratch or the like in this recorded information area, and the scratch or the like causes the optical pickup to make a track jump in the inner circumferential direction of the disc and produce a sound. If a jump occurs and the same portion is repeatedly played like an analog record, there is a drawback that the playback cannot proceed.

The present invention has been made in view of the above points, and an object of the present invention is to solve the drawbacks of the conventional example and to force the optical pickup when the TOC information cannot be read due to a scratch on the disk surface or the like. If you can move to the recorded information area and play the recorded information from the innermost circumference of the disc, or if the recorded information is repeatedly played, the optical pickup is forced outward from the sound skip position. The present invention provides an optical disk reproducing apparatus capable of physically performing track jump to execute reproduction.

[0010]

FIG. 1 is a functional block diagram showing a functional configuration of the present invention. In an optical disc reproducing apparatus of the present invention, an optical pickup reproduces recorded information on a disc of an information recording medium. An optical disk reproducing apparatus is provided with a TOC information reading means, a searching means for searching at least the recorded information at the innermost circumference of the disk when the TOC information cannot be read, and a reproducing means for reproducing the searched recorded information. Is.

Further, in the optical disc reproducing apparatus in which the optical pickup reproduces the record information of the disc of the information recording medium, the detecting means for detecting the sound skip of the optical pickup at the time of reproducing the disc record information, and the inner peripheral direction of the disc. Track jump means for moving the optical pickup from the sound skip position in the outer peripheral direction of the disk by detecting the sound skip.

[0012]

The operation of the optical disk reproducing apparatus of the present invention will be described with reference to the functional block diagram of FIG. According to this invention,
The optical pickup is a TO
When the C information is read (TOC information reading means 1), if the TOC information recording surface of the disc cannot be read due to scratches or the like, the track number (TNO) of the recorded information at the innermost circumference of the disc, that is, , The TNO of the first music recorded on the CD disc is searched (search means 2), the music information of the first music searched is forcibly reproduced (reproduction means 3), and the first music on the innermost circumference of the disc is sequentially searched. It is possible to continue the reproduction and reproduce the final recorded information.

In addition, during the normal reproducing operation when the TOC information area is normal, or as described above, the TOC information cannot be read and the recording TNO at the innermost circumference of the disc is forcibly searched for during the reproducing operation. If the optical pickup skips to the inner rim of the disc due to scratches in the recorded information program area, the optical pickup replays the previously played portion, and replays to the inner rim of the disc at the sound skip position. I skip and play the same position repeatedly.

Such a sound skip in the inner circumferential direction of the disc is detected (sound skip detecting means 4), and the optical pickup is forced to make a track jump from the sound skip position to the outer circumferential direction of the disk (track jump means 5). It is possible to reproduce the information in the program area recorded on the outer periphery of the disc, reproduce the recorded information on the outer periphery of the disc in order, and continue the reproduction until the final recorded information.

The timer measures the predetermined elapsed time of the reproduction continuing operation, and when the time is over (timer means 6), the optical disk reproducing apparatus stops the reproduction operation (stop means 7).

As described above, even when reproduction is impossible, the track information is simply jumped to reproduce the recorded information area in which the optical pickup has moved as much as possible, and some of the scratches and eccentricity on the disc are caused. Thus, it is possible to solve the conventional problem that other normal recorded information cannot be reproduced.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of an optical disk reproducing apparatus according to the present invention will be described with reference to FIGS. FIG. 1 is a functional block diagram, FIG. 2 is a block diagram of a main part of hardware,
FIG. 3 is a flowchart explaining the operation.

In FIG. 2, reference numeral 11 denotes a disc which is an information recording medium. The disc 11 is rotated by a spindle motor 12 while being placed on a turntable and recorded by the optical pickup 13 on the disc 11. Information can be read and reproduced.

Reference numeral 14 is a servo system signal processing unit for performing tracking servo and focus servo by the recording information signal read from the optical pickup 13 to perform tracking and focusing control.
Is controlled by the microcomputer 15.

As is well known, the microcomputer 15 basically comprises a CPU, a ROM, a RAM, an input port and an output port (not shown), and a program for controlling the CPU is written in the ROM. The CPU performs arithmetic processing while fetching the required input data from the key input unit 16 connected to the input port or exchanging data with the RAM according to this program, and the arithmetic processing data as necessary. Is output from the output port to the information display unit 17 to display the reproduction state.

The optical disc reproducing apparatus thus constructed, for example, a CD player, issues a command such as play (PLAY), stop (STOP) or track jump by operating the keys of the key input unit 16, and the command data is used by the microcomputer.
The data is supplied to the data processing unit 15 and processed, and the operation of each unit of the CD player can be controlled. This operation will be described with reference to the flowchart of FIG.

First, the TO recorded on the disk 11 is
The C information is read by the optical pickup 13, and it is confirmed by the microcomputer 15 whether all the TOC information has been read.
(Step S1), and when all the TOC information is normally read, the reproduction desired instruction TNO designated by the key input unit 16 is searched for and the reproduction of the recorded music information is started as in the conventional case (step S1). S3).

On the other hand, the TOC information is read by a disc.
If the CD cannot be read within a predetermined time due to scratches or eccentricity (steps S1 and S2), the CD player forcibly searches the first piece of recorded music information under the control of the microcomputer 15, Playback of the first piece of music is started (step S4).

In this way, when reproduction is started (step S
(3, S4), the read information of the reproduction record information is displayed on the information display section 17 so that the user can confirm the reproduction operation of the first music piece (step S5).

As described above, in the state where the reproduction of the music information of the first music is started, the program area of the first music is scratched and the optical pickup 13 is scratched on the disk 11 in the inner circumferential direction of the disk 11. When sound skipping occurs and the optical pickup repeatedly plays the same track, the microcomputer 15 detects sound skipping in the inner circumferential direction of the disk 11 (step S6), and the optical pickup 13 is forced to play the above sound. A track jump is performed from the flying position toward the outer circumference of the disk 11 (step S7).

The optical pickup 13 moves in a track jump by a command from the microcomputer 15, and it is judged whether or not the program area of the jumped track can be reproduced in a normal state without any damage (step
S8), if it is in the normal reproduction state, the reproduction of the recorded music information of the disk 11 is continued (step S11).

On the other hand, if the program area where the track jump has occurred is damaged or the like and normal reproduction is impossible, the microcomputer 15 further causes the optical pickup to make a track jump in the outer peripheral direction of the disk 11 (step S9), If the normal playback state is entered within the predetermined time (step
In the same manner as above, the reproduction is continued from the program area where the track jumped (step S11), the microcomputer 15 detects that the lead-out area has been reached by reproducing the last recorded information (step S12), and the reproduction operation is performed. Is stopped (step S13).

When the track jump reproduction is impossible within a predetermined time due to the damage of the disk 11 or the like (steps S8 to S10), the optical disk reproducing apparatus performs the reproduction similarly to the lead-out operation. Stop (step S13).

As described above, when the TOC information on the disk 11 cannot be read due to scratches or eccentricity, or even when the TOC information is read, there is a scratch or the like in the program area of the recorded information and the recorded music information is not recorded. Even if the disc cannot be read, the optical pickup 13 is forced to disc from this unreadable position.
11 By making a track jump and move in the inner circumferential direction, it is possible to play from the track jumped playback position to the last recorded music information song.

That is, even if the TOC information of the disk 11 cannot be read and the program area of the recording information is normal, it has been processed as a defective disk 11 in the past, but in the present invention, the first track of the innermost circumference of the disk 11 is processed. You can force play the music program and listen to the music, bad disc 11
It will not be processed as.

Similarly, even if a part of the recorded information program area being reproduced is unreproducible, the unreproducible point is detected and the track is jumped to the outer peripheral direction of the disk 11 to forcibly reproduce it. The music information from the point to the end can be heard, and by simply continuing the reproducing operation in this way, it is possible to reduce defective disks and effectively utilize them.

[0032]

As described above, the optical disk reproducing apparatus according to the present invention searches for and reproduces the first track of the innermost circumference of the disk 11 of recorded information even if the disk 11 has a scratch or the like which cannot be reproduced. , Or if a sound skip occurs in the inner circumferential direction of the disk 11 during playback and the sound skip occurs, the sound pickup is detected and the optical pickup is forcibly jumped to the outer circumferential direction of the disk 11 for reproduction. Since reproduction can be performed in this state, there is an effect that it is possible to detect and reproduce a program area that can be reproduced even on the disk 11 that seems to be unreadable, and the playability of the optical disk reproduction apparatus can be improved.

Even if scratches or concentric circles are scratched on the TOC information or the program area on the disk 11 for some reason, the reproducible program area can be automatically detected and reproduced for the time being. It is possible to immediately reproduce the reproducible portion and listen to the music without giving up when wanting to listen to the like, and to reduce the mental shock without wasting the disc 11.

Moreover, the fact that the recorded information can be reproduced by the search function and the track jump function of the optical pickup even if the disc 11 is scratched or the like can be achieved by the software of the built-in microcomputer. It has the advantage that it can be upgraded without increasing the cost and is easy to implement.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing an operational configuration of an optical disc reproducing apparatus according to the present invention.

FIG. 2 is a block diagram of hardware of essential parts showing an embodiment of the present invention.

FIG. 3 is a flowchart explaining the operation of the embodiment of the present invention.

FIG. 4 is a flowchart illustrating an operation of a conventional example.

[Explanation of symbols]

 11 Disc of information recording medium 12 Spindle motor 13 Optical pickup 14 Servo system signal processing section 15 Microcomputer 16 Key input section 17 Information display section

Claims (2)

[Claims] 1. An optical disc reproducing apparatus for reproducing information recorded on a disc of an information recording medium by an optical pickup, comprising: TOC information reading means, and a search for searching at least the recording information at the innermost circumference of the disc when the TOC information cannot be read. An optical disk reproducing apparatus comprising means and reproducing means for reproducing the searched record information. 2. An optical disc reproducing apparatus in which an optical pickup reproduces information recorded on a disc of an information recording medium, and a detecting means for detecting a sound skip of the optical pickup when reproducing the information recorded on the disc, and an inner circumferential direction of the disc. An optical disk reproducing device, comprising: track jump means for moving the optical pickup from the sound skip position in the outer circumferential direction of the disk by detecting the sound skip.