JPH08111080A - Optical disk reproducing device - Google Patents

Abstract

PURPOSE: To reproduce an optical disk without an impediment by dividing user recording area on a DRAW type optical disk into plural blocks, beforehand recording the contents data of the blocks and recording track numbers corresponding to the blocks and the signal data showing the presence of the information data as the information data and the additional information of the information data. CONSTITUTION: Before the information data on the optical disk 1 are reproduced, the contents data are reproduced to be stored in the memory in a system control part 8, and the inner circumferential sides a prescribed amount inside the start positions of respective tracks are reproduced from the stored contents data, and the signal data showing the presence of the information data are read out. Then, when the signal data show no data, the fact that the track has ended, is judged, and when the signal data show that the information data exist, the fact that the track has not ended but is continuing, is judged, and the contents data are re-formed, and the data in a storage means are re-stored, and the system control part 8 performs reproduction control by the re-formed contents data.

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 device.

[0002]

2. Description of the Related Art Conventionally, as a medium for reproducing a music signal, a compact disc (hereinafter referred to as a CD) which is widely used for consumer is known. In recent years, research on recording films of optical discs has been actively conducted, and recordable optical discs have been developed and put to practical use. In a recordable optical disc, heat generated by irradiation of laser light deforms the recording film or burns the recording film to form recording pits, so that recording can be performed only once and cannot be erased. Write-once type (Direct Read After Writ
(e: DRAW) Optical information is obtained by changing the direction of perpendicular magnetization of a recording film by using a laser beam as a light source and applying an external magnetic field to the magneto-optical disk from a position opposite to the light source, similarly to what is called an optical disk. A rewritable type (Erasable-DR) that can record and erase recording repeatedly
AW) There is a so-called magneto-optical disk.

An optical disk recorder (recording device) for recording by using the optical disk having the recording film capable of freely recording has been developed and put into practical use. Therefore, in order to reproduce by a CD player like a reproduction-only CD, a user recording area is provided on the outer peripheral side of the optical disk to record data (for example, a music signal) on these optical disk recorders, and a table of contents is formed on the inner peripheral side. An area is provided, and the table of contents data of the recording data (TOC (Table of Cont
ents)) is recorded.

[0004]

However, in the case of the write-once type optical disc, since rewriting after recording is not possible, recording in the table of contents area cannot be performed until all recording in the user recording area is completed. Therefore, a CD player that reads TOC information at the time of reproduction and reproduces recorded data based on the information has a problem that the above-mentioned optical disc in which the table-of-contents area is not recorded cannot be reproduced. Therefore, the user recording area is divided into a plurality of blocks. The start position data of the block is recorded in the table of contents area as the table of contents data in advance, and it is possible to reproduce the optical disk from the table of contents data as if the user recording area is recorded as if the recording is completed. A method was considered.

FIG. 7 is a diagram showing a recording format for recording information data by dividing the user recording area of the optical disc into a plurality of blocks. It shows a state when information data is recorded over a plurality of blocks. In the figure, when information data such as a music signal is recorded over a plurality of blocks, the block number of the subcode, which is the additional data of the table data and the information data of each block, the INDEX number of the subcode, and the elapsed time And the reproduced signal waveform. The user recording area is divided into five blocks between 31 and 36, and therefore, one block is shown between each and one track is formed. 31-35 have shown the start position of each block, respectively. The elapsed time is a curve indicating the passage of time, the inclination thereof indicates the elapsed time of the movement of the optical disk reproduction position, and 0 minutes 0 seconds indicates the signal recording start position of each block.

When an optical disk in which each track start position data is recorded in the TOC area as the table-of-contents data is reproduced by the CD player, the table-of-contents data is first read and the user recording area can be accessed. Even if data is not recorded in these blocks of the user recording area, the instructed track can be accessed. The case of recording music data on an optical disc divided into blocks in this way will be described with reference to FIG. Data recording is started from the M-th track start position 31. The data to be recorded is a subcode of the music data and the additional data.
The track number (song number) and the INDEX number are included in this subcode. One piece of music data to be recorded is longer than one divided block and recorded on the (M + 1) th and (M + 2) th tracks, respectively, and the subcode track numbers are M and M +.
1, M + 2 and INDEX = 1 are recorded simultaneously.

It is assumed that the recording is further continued and the recording is finished at the middle 37 of the (M + 3) th track. The remaining part of the (M + 3) th track (between 37 and the start position 35 of the next block) is filled with silence signal data, 0 is recorded in the subcode data INDEX, and the track number is (M + 3).
Will be recorded instead of (M + 4). On the other hand, in the CD player, a series of data such as one piece of music is called one track. Therefore, when the optical disc recorded in this way is reproduced by the CD player, for example, if the Mth tune is specified, the reproduction is started from the start position 31 of the Mth track, but the (M + 1) th start position. Since the track number was changed at 32, there was a problem that the reproduction was stopped despite the middle of the song. Alternatively, if the (M + 2) th tune is erroneously designated, there is a problem in that the reproduction is started from the start position 33 of the (M + 2) th track, regardless of the middle of the tune.

[0008]

In order to solve the above problems, the user recording area of the optical disk according to the first aspect of the invention is divided into a plurality of blocks, and the blocks are assigned to tracks. Track numbers and start of the tracks. Index data consisting of position data is recorded in the index recording area, information data and additional data of the information data are recorded in the track, and the additional data is a track number whose number increases as the track changes and the information. An optical disk reproducing apparatus for reproducing the optical disk, which is a signal indicating the presence or absence of data, including reproducing means for reproducing the information data and the index data from the optical disk, and a storage means for storing the additional data and the index data. The position of the data presence detecting means for detecting the presence or absence of data from the information data presence signal and the position of the reproducing means are controlled. Reproduction position control means for storing the table of contents data in the storage means prior to reproduction of the information data, and accessing the start position of the track by the table of contents data to reproduce a predetermined range to determine whether or not the information data exists. When the signal detecting means detects the presence of the data, the track number is erased from the stored table of contents data.

Further, in the optical disk reproducing apparatus according to the second aspect of the invention, the table-of-contents data having a missing number due to track number erasure is reorganized, the track numbers are reassigned in order, and the storage means is stored in the reorganized table-of-contents data. It is characterized by fixing.

Further, in the optical disk reproducing apparatus according to the third aspect of the present invention, when the information data and the additional data of the disk are reproduced and the track number of the additional information changes and the data presence / absence detecting means detects a signal with data. It is characterized in that the reproduction is continued and the reproduction is terminated when the data presence / absence detecting means detects a signal having no data.

Further, in the optical disk reproducing apparatus according to the present invention, the information data and the additional data of the disk are reproduced, and the reproduction is interrupted when the data presence / absence detecting means detects the no-data signal which continues for a predetermined time or longer. Then, the reproduction means is track-jumped to the start position of the next track and the interrupted reproduction is restarted.

[0012]

According to the optical disk reproducing apparatus of the present invention, the table of contents data is stored in the storage means prior to the reproduction of the information data, and the starting position of each track is accessed by the table of contents data to reproduce a predetermined range, When the signal indicating the presence / absence of data of the above-mentioned additional data is present, it is determined that the information data is continuous data even if the track number has changed, and the corresponding track number is erased from the table of contents data of the storage means. , 1 recorded across multiple blocks
One track number is given to each piece of information.

Further, according to the optical disk reproducing apparatus of the invention of claim 2, even if a track number is missing due to erasing the track number of the table-of-contents data, the track numbers are reassigned in order and reorganized into track numbers without missing numbers. Then, since the table-of-contents data of the storage means is stored again in the table-of-contents data after the reorganization, the number of the information data and the track number of the table-of-contents data can be matched.

Further, according to the optical disk reproducing apparatus of the invention of claim 3, when the block number of the additional data is changed during the reproduction of the information data, the signal indicating the presence or absence of the additional data is the information when the data is present. It is possible to recognize that the data track (song) is continuing and to continue the reproduction. When the signal indicating the presence or absence of the additional data data is not data, it is possible to judge that the information data has ended and to end the reproduction.

Further, according to the optical disk reproducing apparatus of the invention of claim 4, when the reproduction of the signal having no data continues for a predetermined time during the reproduction of the information data, the track is already finished. Playback is interrupted, the track jumps to the start position of the next track according to the table of contents data, the interrupted playback is restarted, and the next track (song) is played back, so it is possible to prevent unnecessary playback of silent time. .

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing the construction of an optical disk reproducing apparatus of the present invention. In the figure, an optical disc 1 is rotationally driven by a spindle motor 2 which is CLV controlled so that the disc rotation works at a constant linear velocity. The recorded information on the optical disc 1 is read by the optical pickup 3 and added to the EFM demodulation circuit 6 via the head amplifier 4 and the HF signal detection circuit 5. Of the output signals of the EFM demodulation circuit 6, sub-code data read at the same time as the first-read table-of-contents data and information data is stored in a memory in the system control unit 8 via the sub-code extraction circuit 7, though not shown. The stored information data is demodulated into a music signal by the demodulation circuit 9 and output to the output terminal 10 as a reproduction signal.

The system controller 8 of the reproduction position controller 13
Outputs a slide control signal for moving the optical pickup 3 in accordance with the data stored in the memory, and the slide device 12 via the slide drive circuit 11.
Is added to The reproduction position control unit 13 controls the movement of the optical pickup 3 to a position recorded on the optical disc 1 according to each signal block.

Next, the actual operation will be described. Figure 2 shows TO
It is a figure for demonstrating the situation of C data. It is reproduced from the TOC area of the optical disc 1 described in FIG. 1 and stored in the memory in the system control unit 8. This data is read first in the CD reproducing device after detecting the presence / absence of a disc, and the start position information (time code) of each track.
Is recognized as As specific information of the TOC area, FIG. 2 shows the total number of tracks in the disc, the start track number and the end time of all tracks, and the start position information of each track, that is, TM1 for the first track and TM for the second track.
It is as shown in the figure below. In this example, the total number of tracks is 5, and the start track is the first track.

FIG. 4 is a diagram showing a recording format for explaining the reproducing operation of the user recording area of the optical disc, which is divided into a plurality of blocks and records a plurality of information data. The figure shows the relationship between the track number of the table of contents and the subcode, the elapsed time, the INDEX number, and the audio signal waveform with respect to the block. In the figure, the track number of the table of contents data is from the first track to the fifth track, and the outer circumference thereof is a lead-out track indicating the end of the program area. In the first track, the second track, and the fifth track of the track numbers of the subcode, INDEs shown in periods 21, 22, and 23 at the beginning of the track, respectively.
There is X = 0.

In the CD format, INDEX = 0 is defined so as to record the rest state (silent part) of the audio signal. That is, it is defined as a break (between songs) between tracks. Since the track number of the table of contents data is recorded before the information data is recorded, the start position of the track number of the subcode is IN.
It is shifted by DEX = 0. The reproduced signal waveform shows the reproduced signal at this time. INDEX for silent parts
= 0 corresponds to INDEX = 1 in the signal part,
There is a silent portion at the beginning of each of the first and second tracks, and INDEX = 0 corresponds to them. However, at the beginning of the third and fourth tracks, these silent parts and IN
There is no DEX = 0 section.

An optical disc 1 comprising the above tracks is
When reproducing, conventionally, as described above, the table of contents information is read from the TOC area shown in FIG. 2, and the time code indicated by the subcode Q of the reproduction signal from the optical disc 1 is set with the start position of each track as a target. While reading out and comparing, the optical pickup was moved to access the target track number and the position where the INDEX number switched from 0 to 1. In the case of a track without INDEX = 0, the position where the track number is switched is searched from the table of contents data. In this way, the cue to the track is performed,
Receiving a playback command, playback of the audio signal is started.

In FIG. 4, for example, to the second track,
When the track search command is received, the track search is performed with the target position TM2 of the second track of the TOC data read from the TOC area as the target. However,
As explained in the section of the problem to be solved by the invention,
When a single audio signal is recorded, the track number may be recorded over a plurality of tracks, and when the audio signal ends and disappears, the above information is recorded as a silent part (pause state) and IN.
Record DEX = 0 and end. In the case of a disc recorded by this method, the track switching point does not always become the boundary of the audio signal block.

An example of this is the second track and the third track shown in FIG.
The track and the fourth track will be described. In the figure,
There is no silent section at the head positions of the third track and the fourth track, and it can be read from the reproduced signal waveform that the audio signal continues from the second track. That is, the third
When a track search is performed at the beginning of the track or the fourth track and the track is reproduced, the music is reproduced from the middle. Figure 5
[Fig. 6] is a flow chart for explaining TOC data editing. The main purpose of this editing is to access and reproduce a predetermined amount of the inner circumference side from the start position of each track according to the table of contents data stored in the memory in the system control unit 8 of FIG. It is checked whether or not there is a signal indicating that there is no data, INDEX = 0, and the TOC data is edited according to the result and stored again in the memory.

In FIG. 5, first, in step ST1, TOC data is read in the TOC area. TOC
The data are as shown in FIG. Next, in step ST2, the initial data of this routine is set. That is, the start track is T1, the total number of tracks is T2, and INDEX.
The first track for which = 0 is set is set to T3. In this case, T1 is 1, T2 is 5, and T3 is 2. The reason why T3 is used as the second track is that it is not necessary to check because the first track or the start track always creates an INDEX = 0 section in the CD format. Therefore, T3 is set as the second track. Next, in step ST3, the optical pickup is moved from the TOC data to the start position of the track T3 to be checked, the subcode is read in the program area, and a track search is performed for checking. In this case, the start position TM2 of the second track is searched.

In step ST4, the elapsed time 0 minutes 0 seconds 0 frame of the second track, which is the actual start time of the second track, is detected, and the time code indicating the start position of the TOC data read from the TOC area may be slightly different. Since the optical pickup 3 includes the error of
Two recording pit rows are kicked to the inner circumference side of the to make a reproduction state. If you say this in Figure 4, the optical pickup is exactly
Since M2 is to be reproduced from the position on the first track side, it is within the INDEX = 0 section 22 of the second track of the subcode. After step ST5, the subcode is read to check whether INDEX = 0.

In step ST6, it is checked whether the track number of the read subcode is T3 and INDEX = 0. If here, INDEX = 0
If yes, the process proceeds to YES at step ST10, and if not, the process proceeds to NO at step ST7. Since INDEX = 0 exists in the second track, the determination is YES, the process proceeds to step ST10, 1 is added to the check track T3, and the process proceeds to step ST11. T3 in step 11
Exceeds (T1 + T2-1) and checks whether all checks have been completed up to the last track.
In this example, the check track T3 is 3, and the process returns to step ST3. Then, from step ST3, the third track is checked this time. The description up to step ST5 is omitted because it is the same as the above.

At step ST6, the TM shown in FIG.
Check the subcode from a position slightly inside of 3.
As shown in this figure, since there is no INDEX = 0 in the third track, the condition judgment in step ST6 is NO,
Transition to step ST7. In step ST7, it is checked whether the elapsed time of the track to be checked exceeds 0 minutes 0 seconds 0 frames. That is, the track number of the read subcode is the second track, not the third track. Therefore, in this condition determination, the determination is NO, the process returns to step ST5 and the above is repeated.

Even if the optical pickup 3 comes to the point of TM3 in FIG. 4 by repeating the above, the INDEX of the third track
= 0 is not found, so step ST7 is YE.
It becomes S, and it is determined that INDEX = 0 does not exist in the third track, and in step ST8, the track T3 of the TOC data table read earlier, that is, the TOC data on the third track is erased. In step ST9, since the third track is deleted, the total number of tracks T2 and check tracks T3
Decrement (-1) the track number up to the LAST (last) track by decrementing each by minus 1 to 4 and 2.
Then, re-edit the track numbers. That is, the current fourth and fifth tracks become the third and fourth tracks.

However, each start time code is
Move with that track number. That is, in terms of new track numbers, the start positions of the third and fourth tracks are TM2 and TM5. The process proceeds to the next step ST10, and T3 is incremented by 1 to 3. The step of checking the third track is omitted because it is the same as that of the old third track, but the information of the third track is erased in step 8, and the fourth track becomes the third track in step ST9. The third track (fifth track in FIG. 2) is YES in step ST6, the process proceeds to step ST10, and if T3 is incremented by 1 here, the track becomes a check track.
Since a track number equal to or greater than the final track number is designated, YES is obtained in the next step ST11, and this flow ends.

FIG. 3 is a diagram for explaining the state of TOC data after the TOC data is edited. And finally, it is the new TOC data obtained by this flowchart. The total number of tracks will change from 5 to 3. This TOC data is stored in the memory in the system control unit 8 in FIG. 1 and is used to control the system when the music (information) data reproduction is started. That is, in FIG.
Tracks 3 and 4 that changed tracks in the middle of a song
Since the track is erased from the TOC data table, these time codes TM3 and TM4 will not be reproduced by the track search. Then, when the second track is reproduced in the single play mode, the reproduction is continued even if the track number changes.

This is because the second track, the third track, and the fourth track are combined into one track as the second track. In the system described above, the TOC data read out from the TOC area is first erased, and the search operation to each track is performed only with the newly edited TOC data. However, the old TOC shown in FIG. It is further effective to hold both the data and the edited TOC data shown in FIG. 3 inside the apparatus and use them properly according to need. Next, the case of continuously reproducing a plurality of tracks will be described with reference to FIG.

For each of the first, second and fifth tracks,
There is a section of INDEX = 0, during which the audio signal to be reproduced is in a resting state (non-recording part), and if this section is long, reproduction is performed as it is, which only wastes time. Therefore, in order to effectively utilize such time, in the present invention, when this INDEX = 0 section exceeds a predetermined time, this section is skipped and the IN of the track is
The reproduction is restarted from the position where DEX = 0 is switched to 1.

FIG. 6 is a flow chart for explaining the operation of detecting a signal indicating the presence / absence of subcode recording information data. In this flowchart, it is assumed that the reproduction is already in progress, and that one of the two reproduction modes, the continuous track reproduction mode and the single track reproduction mode, has already been determined. And For simplicity, take the track configuration of FIG. 4 again as an example,
In the continuous track reproduction mode, the second half of the fourth track will be reproduced.

In FIG. 6, first, in step ST21, the subcode is read, and in step ST22, it is checked whether the track number of the read subcode has changed. It is assumed that the track number of the subcode is changed from 4 to 5 and the silent part enters the section 23 of INDEX = 0. If YES is determined in step ST22 because the track number has changed, it is determined in next step ST23 whether the reproduction mode is the continuous track reproduction mode (YES) or the single track reproduction mode (NO). Here, it is determined to be YES, and the process proceeds to step ST24.

Here, the presence or absence of the INDEX = 0 section is judged from the read subcode information, and at the same time, the length of the reproduction time of this section is compared and judged with a predetermined value A. This A may be about 5 or 6 seconds. If it is longer than this time, the track jumps to the next track, so this time is set depending on how much silent playback is allowed. When the value is less than or equal to the predetermined value A, the process returns to the first step ST21. If the value exceeds the predetermined value A, the reproduction is temporarily stopped in step ST25, and a track search is performed to the start position of this track in step ST26.
At 27, the playback is started again. And step ST
Return to 21. As described above, when the INDEX = 0 section during reproduction is longer than the predetermined time, by skipping this section and reproducing, it is possible to provide a device that effectively utilizes the time.

[0036]

As described above, according to the configuration of the present invention, the optical disk is divided into a plurality of blocks in advance, and the table-of-contents data of the divided blocks are recorded in the table-of-contents area. If the optical disc has a track number and a signal indicating the presence or absence of information data recorded, the information data can be reproduced without rewriting the index data each time the information data is recorded. In other words, if one song (track) is recorded over multiple tracks and you accidentally specify the track number in the middle of the song,
It will not be played from the middle of the song. Further, since the stored table-of-contents data is edited and the track number and the number (number) of the recorded information data (songs) match, the song number of the table-of-contents data can be used for song selection and display.

Further, it is possible to judge whether the tune is continuing or ending at the changing point of the block, and regardless of whether the tune is continuous, a reproduction error such as stopping the reproduction at the changing point of the block is made. Can be prevented. Further, even if the information data ends in the middle of the block, it is possible to prevent waste of time for reproducing a long silent portion until the next information data.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an optical disc reproducing apparatus of the present invention.

FIG. 2 is a diagram for explaining the status of TOC data.

FIG. 3 is a diagram for explaining the status of TOC data after editing.

FIG. 4 is a view for explaining a reproducing operation of a user recording area in which a plurality of pieces of information data are recorded by being divided into a plurality of blocks.
It is a figure which shows a recording format.

FIG. 5 is a flow chart for explaining editing of TOC data.

FIG. 6 is a flow chart for explaining a signal detecting operation indicating the presence / absence of recorded information data of a subcode.

FIG. 7 is a diagram for explaining a recording format when a user recording area is divided into a plurality of blocks and information data is recorded.

[Explanation of symbols]

 1 Optical Disc 2 Spindle Motor 3 Optical Pickup 4 Head Amplifier 5 HF Signal Detection Circuit 6 EFM Demodulation Circuit 7 Subcode Extraction Circuit 8 System Control Section 9 Demodulation Circuit 10 Output Terminal 11 Slide Driving Circuit 12 Slide Device 13 Playback Position Control Section 21, 22 , 23 Silence and INDEX = 0 section

Claims (4)

[Claims] 1. A user recording area of an optical disk is divided into a plurality of blocks, the blocks are assigned to tracks, and index data including a track number and start position data of the tracks is recorded in the index recording area, and information data is recorded in the tracks. And an additional data of the information data is recorded, the additional data being a signal indicating the track number whose number increases with the change of the track and the presence or absence of the information data. Reproducing means for reproducing the information data and the table-of-contents data from the optical disc, a storage means for storing the additional data and the table-of-contents data, and a data presence / absence detecting means for detecting presence / absence of data from the information data presence / absence signal, A reproduction position control means for controlling the position of the reproduction means, and prior to reproduction of the information data. The index data is stored in the storage unit, the start position of the track is accessed by the index data to reproduce a predetermined range, and when the information data presence / absence signal detecting unit detects the presence of the data, the track number is set to the aforesaid track number. An optical disk reproducing device characterized by erasing from stored table of contents data. 2. The optical disk reproducing apparatus according to claim 1, wherein the table of contents data having a missing number due to erasing the track number is reorganized, the track numbers are reassigned in order, and the data of the storage means is stored in the reorganized table of contents data. An optical disk reproducing device characterized by being fixed. 3. The optical disk reproducing apparatus according to claim 1, wherein the information data and the additional data of the optical disk are reproduced, and when the track number of the additional information changes and the data presence / absence detecting means detects a signal with data, the reproduction is performed. Continue,
An optical disk reproducing apparatus, wherein reproduction is terminated when the data presence / absence detecting means detects a signal indicating that there is no data. 4. The optical disk reproducing apparatus according to claim 1, wherein the information data and the additional data of the optical disk are reproduced, and when the data presence / absence detecting means detects a no-data signal which continues for a predetermined time or longer, the reproduction is interrupted and reproduced. An optical disk reproducing apparatus, characterized in that the means jumps to the start position of the next track and the reproduction is restarted.