JP2704998B2 - Optical disk recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording device.

[0002]

2. Description of the Related Art Conventionally, as a medium of an optical disk for reproducing a music signal, there is a compact disk (CD) which is widely used by consumers. In recent years, research on recording films of disks has been actively promoted, and recordable optical disks have been developed. On a recordable optical disk, a write-once type (DRAW) which can be recorded once and cannot be erased, of a type in which a recording film is deformed by heat generated by laser beam irradiation or a recording pit is formed by burning out the recording film ), And a type of recording in which information is recorded by changing the direction of perpendicular magnetization of a recording film by applying an external magnetic field from an opposite position to an optical disk using a laser beam as a light source. Rewriting type (Era
Stable-DRAW (magneto-optical type).

An optical disk recorder (recording apparatus) for performing recording using an optical disk having a recording film capable of freely recording has been developed. Above all, recording is performed on a recordable optical disk medium that operates according to the same playback principle as a read-only CD player, and if the disk format is the same as that of a playback CD, this optical disk is similar to a playback-only CD. It can be played back on a CD player.

In these optical disk recorders, after recording, the table of contents information (T
In order to record OC (Table of Contents) information as address information for each track, an area of a free area (TOC area) is taken, and a signal (TOC area) from the outside of the free area to the outer periphery of the optical disk to a user recordable area. For example, a music signal (for a CD) is recorded. Then, when recording is performed to a predetermined outer peripheral position, or when recording is performed to an arbitrary position and recording on the outer peripheral side is not performed any more on the optical disk, the optical disk is moved to the index area of the inner peripheral portion of the optical disk. Move the pickup and record the signal (music signal (song) for CD)
Is recorded in this table-of-contents area, and the recordable optical disk is regarded as a recording-completed disk.

[0005]

However, when the recording of a recordable CD is completed, the TOC, which is the index information of the music, is used.
This is the time when recording of the C information in the TOC area, which is the table of contents area, is completed. In other words, in the optical disk recorder of the related art, it is impossible to record the TOC unless the recording end of all the user recordable areas is determined. However, for example, in a read-only CD player, the TO
If the TOC information is read from the area C and the start position of each track on the disk is not recognized, the reproduction becomes impossible.

[0006] This is because, when a CD is inserted, a general read-only CD player first searches for a TOC area and recognizes this TOC information. Therefore, T
If a recordable CD in which no OC information has been recorded before or during recording is inserted into a read-only CD player, and one track is to be reproduced, for example, the start of the first track is not performed because there is no TOC information. The position cannot be recognized and cannot be reproduced.

[0007] Therefore, it is impossible to use a CD player for reproduction to record some music by a CD recording device and to use music information of a recordable CD that has not been recorded yet and has not been recorded yet or is being recorded. Therefore, the TOC information must be recorded in order to enable reproduction by a CD player even though a recordable CD still has a recordable area. If the TOC information is recorded, the recording is completed, and additional recording cannot be performed even if a recordable free area remains. This is not an important problem if the optical disk is an erasable medium, but there is a problem that the recording area cannot be effectively used in a write-once recording medium on which recording can be performed only once. On the other hand, for a signal recording portion corresponding to the table of contents information allocated at equal time intervals, a valid recording portion and a pause portion may not be clearly distinguished. In some cases, there is a problem that the calculation is erroneously performed or the start position is not correctly searched. It is an object of the present invention to provide an optical disc recording apparatus that records table of contents information so that the remaining unrecorded area can be recorded even when recording is completed halfway when recording on an optical disc. It is in. Also, the object of the present invention is to:
An object of the present invention is to provide an optical disk recording apparatus capable of recording and identifying an effective recording portion and a pause portion when recording is performed on an unrecorded area of an optical disk during recording.

[0008]

SUMMARY OF THE INVENTION An optical disk recording apparatus according to the present invention includes a signal recording means for recording a recording signal block in a user recordable area for recording information data on an optical disk, and a recording position of the recording signal block. A table-of-contents recording means for recording table-of-contents information in a table-of-contents recording area outside the user recordable area; first table-of-contents information of each recording signal block recorded before recording of a recording signal in the user recordable area; Table-of-contents recording control means for recording second table-of-contents information in the table-of-contents recording area for allocating user recordable areas of recording to equally-spaced recording signal blocks; Means for recording time information in a predetermined area of an optical disk by means for reproducing the time information from the optical disk; An information reproducing unit, and, when recording a recording signal block in the unrecorded user recordable area, adding each subcode information to each recording signal block based on the time information recorded by the time information recording unit; Signal recording control means for recording the subcode information to the subcode information, and block number switching means for switching and setting the block number information of the subcode information. By switching the block number, signal data indicating the recording pause state is recorded up to the position before the next recording signal block start position allocated at equal intervals.

[0009]

[Function] Freely recording on a plurality of tracks in a user recordable area on an unrecorded optical disk that has not been recorded on the table of contents recording area, and recording an optical disk in the middle of recording up to a track at an arbitrary position for general reproduction When it is desired to play back with a dedicated CD player, the optical disc recording apparatus of the present invention sets the first table of contents information of a plurality of tracks recorded so far and the remaining recordable user recordable area of the optical disc at equal intervals. The second table of contents information, which is a recording signal block allocated by time, is recorded in the TOC area.

According to this method, when an optical disk being recorded is inserted into a general read-only CD player, the index information can be recognized because the index information is already recorded in a predetermined index area. You can play the tracks that have been played.

[0011] Then, the time table information at equal intervals can be recorded on an optical disk, and this information can be reproduced from the optical disk. Sub-code information can be added at the time of recording a signal in the remaining user recordable area based on the read timetable information of equal intervals for time allocation of the remaining user recordable area.

Further, the block number (subcode information) of the recording signal is switched by block number switching means,
It is possible to encode and record the pause (pause state) of the recording signal block until the start position of the next recording signal block, and when the recording signal is a music signal,
A recording signal block including a pause between music signals can be formed or formed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In this embodiment, as a recordable optical disc, a write-once write-once CD (CD-
R, DRAW, etc.). The table of contents information is based on the TOC (T
This information is referred to as “able of contents” information.

FIG. 1 shows a configuration diagram of an embodiment of an optical disk recording apparatus according to the present invention. In FIG. 1, a write-once CD
The optical disk 1 is rotated by a required number of rotations by a spindle motor 2 which is CLV-controlled so that the disk rotation operates at a constant linear velocity. Information recorded on the write-once CD 1 is read by the optical pickup 3 and applied to the EFM demodulation circuit 6 via the head amplifier 4 and the HF signal detection circuit 5. EFM demodulation circuit 6
Is supplied to the system control unit 10 via the subcode extraction circuit 7, and the music signal read via the demodulation circuit 8 is demodulated and output to the terminal 9 as a reproduction signal.

At the time of recording on the optical disc 1, a subcode signal output from the system control unit 10 is applied to an EFM modulation circuit 15 via a subcode insertion circuit 11,
This serves as a table of contents information recording means. Further, the EFM modulation signal circuit 15 uses the input terminal 12
Through an A / D converter 13 and a signal processing circuit 14 for modulation, which functions as signal recording means. EF
The output of the M modulation circuit 15 is applied to the laser modulation circuit 16, and the output signal from the laser modulation circuit 16 is applied to the optical pickup 3, and the optical pickup 3 outputs
Record on top. The table of contents information is recorded in the subcode signal. The subcode signal is recorded in addition to the information signal.

On the other hand, in order to move the optical pickup 3, a slide control signal is output from the system control unit 10, and the slide device 18 is transmitted via a slide drive circuit 17.
Is added to The movement of the optical pickup is controlled by the position control means to a position corresponding to each recording. The optical pickup position detection output and the detection output signal of mounting the write-once CD 1 from the optical disc sensor 19 are applied to the system control unit 10, respectively. In the write-once CD, the user recordable area corresponds to, for example, a program area.

Next, the operation will be described. In FIG. 1, it is assumed that the mounted write-once CD 1 is in an unrecorded state. FIG. 2 shows an area configuration in which the present invention is applied to a write-once CD as a radial cross-sectional view as viewed from the side of the disk when recording on the write-once CD 1. Here, the TOC area 20 is set as an empty area, and recording is started from the innermost circumference of the user recordable area 21 on the outer circumference of the TOC area 20. T
FIG. 5 shows details of the OC area. Each data includes the number of all tracks 30, the start track number 31, the end time 32 of all tracks, the track number, and the start time 33 of each track.

The track number to be recorded first is 1,
The start time code position of this track is managed by the system control unit 10 shown in FIG. 1 and stored as data in an internal memory (not shown). When performing this recording, each block in FIG. 1 operates according to the configuration of the above-described embodiment.

What is important is that the EF together with the recorded information signal
The subcode data input to the M modulation circuit 15, that is, the data including the track number, is generated by the system control unit 10. Then, when the recording is stopped and the recording is started, the recording is continuously performed from the previous recording stop position, but the track number at this time is increased by 1 to the second track. Therefore, the start time code of the second track is different from that of the first track recorded earlier.

Recording on the second track, stopping the recording,
When recording is restarted, the next track number becomes the third track, and the track number is sequentially incremented (increased by one) at each stop. At this time, the start time code of each track is TM (1) for the first track, TM (2) for the second track, and
The track becomes TM (3), and these are the first table of contents information in the present invention. If this is shown in the optical disk area of FIG. 2, the area 22a of the first track, the area 22b of the second track, and the area 22c of the third track are arranged from the inner peripheral side of the user recordable area 21 and are arranged in order. .

Each track area can be delimited by any length of time. Here, recording is temporarily stopped in order to switch tracks.
The system control unit 10 of FIG. 1 may receive a track number increment command or the like, and control the system to switch tracks.

However, in the state of the write-once CD, since the TOC area has not been recorded yet, it is impossible to reproduce a track in the user recordable area with a general read-only CD player. . Therefore, in the present invention, the TOC area is recorded from this state,
Further, in order to enable additional recording to be continuously performed in an area where a recording area still remains, this is realized by control that operates according to the flowchart shown in FIG.

FIG. 3 is a flowchart for calculating the TOC data of the remaining user recordable area in the present invention.
The purpose is to perform recording halfway, and to divide the tracks in the remaining user recordable areas that have not yet been recorded by allocating appropriate time. The table of contents information allocated here becomes the second table of contents information. The TOC data calculation is performed by a system control unit or a microcomputer connected to send the calculation data to the system control unit.

First, in step S1, a track division time is determined. This time is the elapsed time within each track. In this embodiment, each track is placed at regular intervals X
Therefore, when recording on the optical disc 1 in the future, the time information allocated at equal intervals and the maximum track number at that time will be recorded at a specific position on the optical disc as described later. This will be played, recognized and track managed.

Next, in step S2, the start time code A2 of lead-out (the end time of all tracks) is added to the last time code recorded so far, ie, the time code TMLAST for the next additional recording, by X (track). (Divided time). The maximum time that can be recorded on the optical disc varies depending on the linear velocity of the loaded optical disc and the track pitch of the optical disc. Therefore, the track must be ended within the maximum recordable time (that is, within A2), and the lead-out track must be set outside the last track. Therefore, the time must be set so as not to exceed this time. .

Next, in step S3, the track number is
The value is obtained by adding 1 to the last track number currently recorded. This is because the first track of the user recordable area remaining unrecorded takes this value as the track number.

Next, in step S4, it is determined whether or not the lead-out start time A2 (the end time of all tracks) has exceeded the maximum recording time. That is, when the track number data is TNO, it is checked whether the time code after the track No. TNO secures the track division time X does not exceed the maximum recording time of the optical disc. Here, if NO, and if it does not exceed, the process moves to step S5, and the start time of the TNO-th track is set. Then, in step S6, the track number is incremented (increased by 1), and in the next step S7, X is added to the lead-out start time A2, and the process returns to step S4.

If the answer is YES in step S4, and the lead-out start time exceeds the maximum recording time of the disc, the process proceeds to step S8, where the lead-out start time A2 is determined as A2-X. Is determined by the value of TNO, and the process ends. Here, the number of tracks is a value held as TNO, and the total recording time at that time is A2. As described above, the TOC data is created.

If this is executed on the optical disk on which the above described third track of FIG. 2 has been recorded, the result is as shown in FIG. FIG. 4 shows an embodiment of the start time code of each track in the present invention. From the fourth track to the Nth track which are not recorded in the user recordable area,
Track times are configured at equal intervals X. At this time, the maximum track number is N, and the lead-out start time is (N-3) .X + TMLAST. Here, tracks 4 to N are not actually recorded in the user recordable area yet.

In FIG. 3, the track division time set in step S1 is a fixed value X having a predetermined value. However, if many types of the time can be prepared in a programmable manner, Usability is improved. For this purpose, the set time of the track time X is not fixed, but can be freely set by inputting a value to the system control unit 10 by a not-shown preset switch or the like. Configuration.

In order to allow the operator to display and recognize the selected track times, the system control unit 1 shown in FIG.
From 0, an image is displayed on the display device via a display circuit (not shown). Here, the maximum number N of tracks that can be recorded on the optical disk and the total time (N-
3) Display X + TMLAST.

Although not shown, a signal indicating that each track time selected by the operator has been determined is received by the system control unit 10 of FIG. The controller 18 controls the optical pickup 3 to move the optical pickup 3 to a position corresponding to the TOC area on the inner periphery of the optical disc 1, and records information indicating the start position of each track as the TOC information. This information is the absolute time of each track calculated by the procedure shown in the flowchart of FIG. 3, and is the data shown in FIG.

Next, TOC recording, which is a feature of the present invention, is to record time information X for tracks that have not been recorded yet but are allocated at equal intervals and the maximum track number N that can be recorded at that time. At the same time as the completion, the data is recorded on the optical disk. This recording position is the position shown as the data recording area 23 on the inner peripheral side from the TOC area in FIG. It is sufficient for the information to include time information and even the maximum track number.

According to the above example, step S in FIG.
Only the data of X (track division time) set in 1 and the maximum track number N need be recorded. Therefore, T
There is no need to record the start time of each track as recorded in the OC for each track, and processing can be performed in a short time for recording or reproduction.

In this way, recording in the TOC area,
When the recording of the division time for the remaining user recordable area is completed on the optical disc, the recordable CD is still recordable, but since the TOC information has been recorded, it is inserted into the read-only CD player. Thus, it is possible to perform the reproduction in the same manner as the reproduction-only CD. However, since the tracks actually recorded in the user recordable area are up to the third track in the above-described example, the recorded information can be reproduced up to this track. Further, since the write-once type CD capable of additionally recording can still be continuously recorded, if it is set again in the above-described optical disc recording apparatus, additional recording can be performed from the subsequent fourth track.

The operation of the additional recording will be described with reference to FIG.
The system control unit 10 controls the TO of the loaded write-once CD1.
It is checked whether or not a record has been made in the area C. To do so, a signal is read from the TOC area of the write-once CD 1 via the optical pickup 3, the head amplifier 4, the HF signal detection circuit 5, the EFM demodulation circuit 6, and the subcode extraction circuit 7, and the presence or absence of TOC data is checked and determined. I do. When the TOC data is recorded,
The C data is reproduced and stored in an internal memory (not shown).

In addition, in order to check whether or not the division time for the remaining user recordable area is recorded, the data recording area is shown as a data recording area 23 provided further inside the disc than the TOC area shown in FIG. An HF signal is detected in the area. If there is a signal, it is read. By recognizing this data, the system control unit 10 can recognize the allocation time X of each track to be recorded from now on and the maximum track number N indicating how much recording is possible.

However, at this point, it is unclear whether there is still an area to be recorded on the optical disc. Therefore, next, it is checked whether or not this write-once CD 1 is all recorded and recording is completed. This includes write-once CD1
The track number recorded at the end of the user recordable area is read, and the track number and the additional time code are recognized. In the case of the write-once CD shown in the above example, the last track number of the recorded track is 3, and the write-once time code data is detected as TMLAST. As a result, it is found that the recording from the fourth track to the maximum track number TNO of the optical disc recognized by the TOC data has not been performed yet.

Therefore, it is possible to additionally record from the fourth track to the TNO-th track. Here, it should be added that when the additional recordable optical disc is placed, the state of the optical disc is checked in the order of TOC data read, division time and maximum track number data recognition, and additional write subcode recognition. If the number of tracks is large, it takes time to read the TOC data. In the format of the data to be recorded in the TOC, the start time code information of each track is recorded three times in succession, so that the time of one subcode is 13.3 milliseconds. The time required for a truck is 99 × 3 × 13.3 milliseconds, which takes about 4 seconds.

In the present invention, since the area of each track on which additional recording can be performed is divided at equal intervals, even if the start time code of each track in the area on which additional recording can be performed is not recognized,
If the allocation time X of each track to be recorded and the maximum track number N indicating how much recording is possible are recognized and reproduced,
There is no need to recognize the start time code of tracks divided at equal intervals.

Therefore, the order of checking the state of the optical disk is as follows: first, the division time and the maximum track number data recognition, then the additional recording subcode recognition, and the TOC data reading. There is no need to read the start time code of a track larger than the obtained last track. That is, in the case of this example, the start positions from the first track to the third track are read, and thereafter, there is no need to read, so that the state check of the loaded optical disc can be completed in a short time.

When the initialization of the loaded optical disk is completed and a recording standby command is input from the outside to the system controller 10, in order to perform the recording standby on the fourth track, the additionally recognized time code TML previously recognized.
Move the optical pickup 3 to a position corresponding to AST,
Stand by. Recording starts when an external recording start command (not shown) is input to the system control unit 10 from the standby state. That is, the sub-code information generated by the system control unit 10 is input from the terminal 12 through the sub-code insertion circuit 11 together with the audio signal that has passed through the A / D converter 13 and the signal processing circuit 14 and the EFM modulation circuit 1
5. Recording is performed on the fourth track of the write-once CD 1 via the optical pickup 3 via the laser modulation circuit 16.

While performing this recording, the division time for the read remaining user recordable area, that is, the allocation time for each track, is switched to the fifth track when this time has elapsed. These processes are
The subcode generated by the system control unit 10 and corresponding to the track number switching is output to the subcode insertion circuit 11.

More specifically, the time position at which the track number is changed from 4 to 5 is changed at the time code position of X + TMLAST. Similarly, during the recording of the sixth track, the subcode is switched to the seventh track this time after the division time X has elapsed from the point of switching to the sixth track. In this way, after the track division time has elapsed, the user recordable area is recorded in each track. If it is not necessary to continue recording as it is, recording may be temporarily stopped at a change point of the track. The point at which the track switches is the start time of each track, which is the data of the TOC area recorded earlier.

When the recording to the seventh track is completed, the recording is stopped, the optical disk is taken out from the optical disk recording device, and the fourth to seventh tracks, which have just been additionally recorded, are immediately reproduced by the reproduction-only CD player. be able to.

Next, a description will be given of a sequence in which the track numbers are switched and a pause state (pause) is created between the tracks to record. FIG. 6 is a signal waveform diagram showing an example in which a pause (pause) is created between tracks (between recording signal blocks) according to the present invention. This is a signal waveform with time on the horizontal axis. Waveform 4 indicating recording signal
0 indicates a flat waveform portion near the center, in which the signal is muted. The absolute elapsed time 42 is the total elapsed time from the beginning of the user recordable area. Here, a case where a pause state is provided between the Mth track and the (M + 1) th track is shown, and a broken line 45 shown as 44 near the center of the waveform of the track elapsed time 41 indicating the elapsed time in the track is shown. The section between 46 corresponds to this.

In FIG. 1, while recording the M-th track,
Although not shown, when the system control unit 10 receives a track number switching command from the outside, the track number to be output to the subcode insertion circuit 11 is switched from M to M + 1 to be the (M + 1) th track. At the same time, the (M
+1) The elapsed time in the track is the (M)
+1) Set to a time difference from the time of the start time code of the track. Here, the start time code 46 of the (M + 1) th track is actually the start timecode recorded in the TOC area, and has been switched to the (M + 1) th track before this time.

Then, the track elapsed time 41 shown in the section of 44 does not increase like the normal elapsed time shown by 43 but decreases. Just at the time indicated by 46, the actual recorded signal is subjected to EFM encoding. While recording the portion indicated by 46, the input signal is not subjected to EFM encoding, and invalid data (mute or silence data) is converted to EF.
M encoding is performed, and the subcode index number is recorded as 0.

As described above, when recording the index 0 of the next track, after recording a valid recording signal for the allocation time (the maximum elapsed time of each track) in one track, Then, if the remaining area is recorded as invalid data (mute data) and the next track number is recorded, a valid track not including the index 0 can be formed.

Therefore, in a CD player used in a broadcasting station, during the reproduction of one track, in order to accurately calculate the remaining time of the reproduction, the end of the track is required before the reproduction of the track is started. Look around the position to see if the next track contains index 0,
It has been calculated. This is because, according to the CD standard, since the start time code of each track recorded in the TOC area indicates the position where the index number becomes 1, the TOC data when a certain track includes the index 0 is read. When the remaining time is calculated based on this, the remaining time may be calculated longer than the actual time, but this is to prevent this.

Therefore, according to the present invention, the surplus tracks of each track are recorded not only by simply recording mute data but also by setting the track number to the next track number and setting the index number to 0. As described above, after recording the last track number recorded in the TOC area, that is, the Nth track, the lead-out track is recorded, and the recording of the write-once optical disc is completed.

An optical disk capable of additionally recording is advantageous in cost. Further, such an optical disk recording device improves the usability of the recording device. Further, a track in which each track is recorded in a free time and a track allocated in a predetermined time can be mixed. The present invention is not limited to a write-once CD, and can be applied to a recordable optical disc.

[0053]

According to the optical disk recording apparatus of the present invention,
When recording on an optical disc, when recording is performed all at once, recording can be performed with the table of contents information corresponding to the recording signal block, and when recording is completed halfway, an unrecorded area of the optical disc is recorded. Since the table of contents information is created and recorded in advance, additional recording can be performed in a shorter time in an unrecorded area of the optical disk where recording has been completed halfway. According to the optical disc recording apparatus of the present invention, when recording is performed on an unrecorded area of an optical disc during recording, an effective recording portion and a pause portion can be clearly recorded and distinguished. Therefore, accurate calculation of time information can be performed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of an optical disk recording device according to the present invention.

FIG. 2 is a radial cross-sectional view showing an example of an area configuration of an optical disc to which the present invention is applied to a write-once CD, as viewed from the side of the disc.

FIG. 3 shows T of a remaining user recordable area according to the present invention;
4 is a flowchart of OC data calculation.

FIG. 4 is a diagram showing one embodiment of a start time code of each track according to the present invention.

FIG. 5 is a diagram showing details of a TOC area.

FIG. 6 is a signal waveform diagram showing an example in which a pause state (pause) is created between recording signal blocks according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk (write-once CD) 2 Spindle motor 3 Optical pickup 4 Head amplifier 5 HF signal detection circuit 6 EFM demodulation circuit 7 Subcode extraction circuit 8 Demodulation circuit 9, 12 terminal 10 System control unit 11 Subcode insertion circuit 13 A / D Converter 14 Signal processing circuit 15 EFM modulation circuit 16 Laser modulation circuit 17 Slide drive circuit 18 Slide device 19 Optical disk sensor

Claims (1)

(57) [Claims] 1. A signal recording means for recording a recording signal block in a user recordable area for recording information data on an optical disc, and table of contents information indicating a recording position of the recording signal block in a table of contents recording area outside the user recordable area. Table of contents recording means, first table of contents information of each recording signal block recorded so far before recording of a recording signal in a user recordable area, and recording signals of an unrecorded user recordable area at equal intervals. Table-of-contents recording control means for recording second table-of-contents information allocated to blocks in the table-of-contents recording area; Means, time information reproducing means for reproducing the time information from the optical disc, and the unrecorded user recordable area. Signal recording control means for adding each subcode information to each recording signal block based on the time information recorded by the time information recording means and recording the subcode information on an optical disc when the recording signal block is recorded on the optical disc; Block number switching means for switching and setting the block number information of the sub-code information when the block number is switched by the block number switching means. An optical disk recording apparatus for recording signal data indicating a recording pause state up to a position before a recording signal block start position.