JP3065499B2 - Write-once optical disc recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a write-once optical disc recording / reproducing apparatus, and more particularly to a write-once optical disc recording / reproducing apparatus which satisfies the linking standard even when an abnormality occurs during recording and prevents abnormal recording.

[0002]

2. Description of the Related Art Conventionally, a write-once optical disc recording / reproducing apparatus (CD-R or CD-W) capable of repeatedly recording information has been known.
In O), if a track jump occurs due to a scratch on the disk or an external shock to the apparatus during information recording, no bit is formed on the track where the track jump occurred (FIG. 8). (Jump in the outer circumference direction) as shown in FIG.

[0003]

When a track jumps in the outer circumferential direction, no pits are formed in that portion, so that a read-only CD player cannot perform servo operation and cannot reproduce data. For example, as shown in FIG. 8, if a track jump of two tracks occurs during recording at a position of a radius of 50 mm, the circumference at a position of a radius of 50 mm is L = 314.2 mm, so that 2L = 628.3 m.
There will be m free spaces. Assuming a linear velocity of 1.4 m / s,
The time when this vacancy occurs is T = 628.3 × 10 −3 /
1.4 = 0.4488 sec, 1 EFM frame is 1/7
Since it is 350 sec, the number NE of EFM frames that have become empty is: NE = 0.4488 × 7350 / 3299EF
The result is an M frame. The number of subcode frames NS
Since one subcode frame is composed of 98 EFM frames, NS = 3299 / 98９８34. For example, if this jump occurs at an address position of 49:17:41 frame, (49:17:41)
+ (00:00:34) = (49:18:00), which means that about 34 subcode frames are vacant.

In the case where address information of the disc cannot be obtained during recording due to an out-of-focus condition or a flaw, recording has been interrupted at that point in the conventional apparatus. As a result, a partial disc that does not satisfy the linking standard is produced. The linking standard is, as shown in FIG. 9, a sync (synchronous signal) of a subcode to be recorded.
At the end of recording of the recording pit, after the end of 26 EFM frames from the rise of the subcode sync,
Recording is completed within the time range until 4 EFM frames elapse, and at the start of recording, recording is started in a time range 4 EFM frames before the timing when 26 EFM frames elapse from the rise of the last recording subcode sync. It is a standard.

[0005] If the recording is terminated outside the linking standard so that a portion not to be recorded is generated, a portion where no pit is formed even if the next track is additionally recorded, may be impossible to reproduce on a CD player.

FIG. 10 shows a conventional sequence of interruption of pit formation due to out-of-focus (out-of-focus) during recording. If pit formation is interrupted due to focus loss during formation of recording pits, 4 EF from the time when 26 EFM frames elapse from the rise of the recorded subcode sync according to the linking standard.
Additional recording is started at a timing before M frames.
For example, if the time from the rising of the subcode sync (sub sync) to the loss of focus is W1, and the time from the rising to the start of additional recording is W2, W1 =
If the focus is lost in 2 EFM frames, the maximum is 24
An empty EFM frame will be generated. 1EFM =
Since it is 1/7350 sec, 24 × 1/7350 =
If 3,265 msec and the linear velocity of the disk are 1.4 m / s, 3,265 × 10 −3 × 1.4 = 4,571 mm, and a space of about 4.6 mm length is generated. The length is long enough to cause a servo deviation in a conventional CD player.

Further, if the address information cannot be obtained due to the same reason as described above, and the recording is interrupted and the next track is additionally recorded, the overwriting may occur at the beginning of the track, and the next track is interrupted. There is a problem that noise is generated at the beginning of a track during reproduction.

FIG. 11 shows the state of occurrence of overwriting due to such conventional additional recording. After recording the first subcode sync SB1, the second subcode sync S
If the pit formation due to focus loss is interrupted before B2 recording, additional recording is performed from the rising edge of the first recorded subcode sync according to the linking standard.
This is performed at a timing four frames before the frame lapse timing. In the case of FIG. 11, the time W1 from the rise of the first subcode sync SB1 to the interruption of the pit formation is 90 EFM frames, and the time W2 from the rise of the first subcode sync to the start of additional recording is 26 EF.
When M frames are used, 64 EFM frames overlap, and 64 × 1/7350 × 1.4 = 12.19 m
m, that is, an overlapping recording portion having a length of about 12 mm (8.7 msec) occurs.

As described above, if a pit vacancy as shown in FIG. 10 occurs, noise is generated in the conventional CD player, and the operation is stopped in the worst case (pit vacancy of about several hundred μm). May be done. FIG.
As shown in FIG. 1, when a pit is over-recorded, noise may occur in a conventional CD player. For example, if the focus is lost while recording the song on track number 1, the user performs an operation to record the song on track number 2 again. But,
In the conventional apparatus, there is a possibility that noise is generated at the head of track number 2.

Accordingly, an object of the present invention is to prevent the occurrence of an unrecorded portion even in an abnormal state in which a defocus or a track jump due to an external shock occurs during a recording operation,
An object of the present invention is to provide a write-once optical disc recording / reproducing apparatus which satisfies a linking standard and prevents overwriting on a track to be additionally recorded during a write-once recording operation.

[0011]

According to another aspect of the present invention, there is provided a write-once optical disc recording / reproducing apparatus for recording / reproducing information on a recordable optical disc. The continuity of the address of the track obtained from the optical disk is monitored, and when the continuity is lost, the recording operation is immediately interrupted, and the silence data is continued for a predetermined time length from the last address A where the continuity is maintained. Is configured to be additionally recorded.

According to another aspect of the present invention, there is provided a write-once optical disc recording / reproducing apparatus for recording / reproducing information on a recordable optical disc.
If the address information of the track obtained from the optical disc cannot be obtained a predetermined number of times during recording, the recording operation is immediately interrupted, and the silence data is transmitted for a predetermined time length from the address position next to the last obtained address. It is configured to record.

According to still another aspect of the present invention, there is provided a write-once optical disc recording / reproducing apparatus for recording / reproducing information on / from a recordable optical disc. The continuity is monitored, and when the continuity is lost, the recording operation is immediately interrupted, and the last address A where continuity is maintained is compared with the address B immediately after the interruption of the recording. When it is smaller, silent data is additionally recorded in the section from the address position (A + 1) to the address position (B-1). When A is equal to B or when A is larger than B, zero is added from the address position (A + 1). Is configured to additionally record silence data in a predetermined time section including.

Here, when the address A is equal to or larger than the address B, silence data is additionally recorded at the next address position of the address A. When the address A is smaller than the address B, the silent data is added. Silence data can be additionally recorded from the address position following A to the address position immediately before address B.

Further, it is possible to notify an abnormal state indicating the interruption of the recording operation, and to prohibit the reception of operation instruction information by key operation from the interruption of the recording operation to the additional recording of silent data.

[0016]

According to the present invention, when the continuity of the address of a track obtained from an optical disk is lost during recording, the recording operation is immediately stopped, and the recording operation is stopped for a predetermined time length from the last address where continuity is maintained. When the silent data is additionally recorded, or when the address information of the track obtained from the optical disk cannot be obtained a predetermined number of times during the recording, the recording operation is immediately interrupted, and the address next to the last obtained address is stopped. Silence data is recorded for a predetermined time length from the position.

[0017]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the basic configuration of an embodiment of a write-once optical disc recording / reproducing apparatus according to the present invention.

From the optical disk 1 that is rotationally controlled by the mechanical control unit 5, recorded information is read via the optical pickup 2 and sent to the signal processing unit 3. The signal processing unit 3 obtains ATIP data, which is one data at 75 Hz, which is modulated and recorded in a pre-group of the disk, of the disk information received via the optical pickup 2 and performs decoding to obtain address information. During reproduction, the EFM signal based on the pits of the disk is decoded and sent to the D / A converter 8. D / A
The signal such as music converted into an analog signal by the converter 8 is sent to a reproduction system.

On the other hand, at the time of recording, an analog signal to be recorded input from the outside is converted into digital data by the A / D converter 9 and supplied to the signal processing section 3. The signal processing unit 3 takes in the digital data supplied from the A / D converter 9, adds the subcode data,
As a signal, a pit is formed and recorded on the optical disk 1 via the optical pickup 2, and a signal for control is also supplied to the mechanical control unit 5.

The mechanical control unit 5 receives signals from the signal processing unit 3 and performs actuator control such as rotation control of the optical disc 1 and focus tracking under the control of the system controller 4. The system controller 4 performs overall control of the apparatus based on operation information from the key matrix 6 and causes the display unit 7 to display operation information, operation state information, and the like.

In the embodiment of the present invention, the continuity of the address is monitored by the signal processing unit 3 and the system controller 4 during recording, and when the continuity of the address is lost, the recording operation is immediately stopped and the display unit is stopped. 7 is displayed to notify the operator. At this time, the address A of the last track where continuity is maintained and the address B obtained immediately before the recording is interrupted.
If A ≧ B, silent data is additionally recorded at the next address position of the address A, and if A <B, the address (B−
Silent data is additionally recorded as the same track number as the track number at which recording was interrupted up to the position of 1). During this time, operation reception from the key matrix 6 is prohibited and the operation is terminated.

FIG. 2 shows a timing chart when recording is interrupted due to a track jump in the outer peripheral direction (when address A <address B). As shown in FIG. 2A, ATIP sinks (SINCs) S1 to S1 on a disk are provided.
In the time sequence of S4, if a track jump occurs after the sync S2, the address on the disk is decoded with a delay of the decoding processing time (FIG. 2).
(B)) For example, as shown in FIG. 2C, the address information of the X portion is not obtained, and the image flies discontinuously from 19:17:40 to 19:17:63.

In this case, when the address of 19:17:63 is decoded, it is determined that the address information is discontinuous (continuous NG). Therefore, the subcode S to be recorded as shown in FIG.
In synchronization with B1, SB2, and SB3, as shown in FIG. 2E, 19:17:40, 19:17:41, and 19:17:42 are recorded. Recording is interrupted at a timing four frames before the lapse of 26 frames from the rise of the code SB4. At this time, the address A corresponds to 19:17:40 and the address B corresponds to 19:17:40.
Equivalent to minutes 17 seconds 63 frames.

On the disk, the ATIP sink is 75H
z is engraved, and 75 frames of address data are engraved per second. The address data read from the disc is decoded by the signal processing unit 3,
When a time delay corresponding to the decoding processing time occurs and the address data is determined by the system controller 4, the address advances to the next address as shown in the figure. The subcode data to be recorded must match the ATIP address, and the sync position is defined by the synchronization standard as shown in FIG.

Now, the operation of additionally writing silent data in this embodiment in the state of FIG. 2 will be described with reference to the timing chart of FIG. FIG. 4 shows the ATIP on the disk.
The sync (A), the address (B), and the address (C) after the delay of the decoding process are shown. The subcode syncs SB1 and SB2 recorded on the disc shown in FIG. 4D are SB1 and SB2 in FIG. 2D, respectively, and follow the linking standard from the time when 26 EFM frames elapse from the rise of the subcode sync SB2. The additional writing operation is started from the timing before 4 EFM, and the sub-code shown in FIG. 4E until the next determined address position (19:17:62 frame) immediately before the determined address position 19:17:63 frame. In synchronism with the sync, as shown in FIG. 4F, silent data is recorded with subcode data added. The additional data is recorded as the data of the track number when the recording was interrupted.

According to this embodiment, the conventional 19: 17: 4
The problem that a pit is not formed from one frame to 19:17:62 can be solved.

When address A ≧ address B, silent data is additionally recorded at an address position next to address A, corresponding to a track jump in the inner circumferential direction. FIG. 7 shows this state. The data of the new track number can be normally linked and recorded. Noise can be prevented from occurring at the beginning of a new tracking number as in the related art shown in FIG.

Next, another embodiment of the present invention in the case where address information is not obtained continuously a plurality of times (four times in the following example) during recording will be described with reference to FIGS. .

In FIG. 5, the address information on the disk corresponding to the ATIP sink shown in FIG.
As shown in FIG. 5 (D), if four consecutive frames were not obtained after 19:17:40 (information after the delay of the decoding process is shown in FIG. 5 (C)). Address information: 19:17:40 frame, 19:17:41 frame, 19:17:42 frame, 19: 19: 17: 40 frame, sequentially corresponding to the recorded subcode syncs SB1 to SB5
Minutes 17 seconds 43 frames and 19 minutes 17 seconds 44 frames are recorded.

Thereafter, it is determined that address information has not been obtained four consecutive times, and the subsequent subcode sync SB
4 from the time when 26 EFM frames have passed since the rise of 6
The timing recording up to and after the frame is interrupted, an error message is displayed on the display unit 7, the input from the key matrix 6 is prohibited, and the address next to the position where the address information was obtained last is obtained. Silence data is additionally recorded for a predetermined time, for example, 3 seconds from the position.

FIG. 6 shows the ATIP sink (A), the address (B) on the disk, and the decode address (C). SB of the recorded subcode sync (E)
After 1 and SB2, the subcode is recorded in a form including silence data for 3 seconds from the timing of 4 frames before 26 EFM frame from the rising of the subcode sync SB2 according to the linking standard, and the last subcode according to the linking standard. 26E from the rising edge of the sink
The additional recording operation is performed from the lapse of the FM frame to the lapse of four frames. Accordingly, as shown in FIG. 6F, the additional recording of the silent data is performed at the address position (19/1/1).
7 seconds 41 frames) to address position (19 minutes 20 seconds 4
(One frame). Therefore,
As shown in FIG. 10, it is possible to prevent a problem that overwriting is performed at the beginning of the next track.

In the above embodiment, the continuity of the address of the track obtained from the optical disk is monitored during the recording, and when the continuity is lost, the recording operation is immediately interrupted to maintain the continuity. And the last address A
The address B is compared with the address B immediately after the interruption of the recording, and when A is smaller than B, the operation is performed so that the silent data is additionally recorded from the large address B for a predetermined time length.
There is a possibility that a portion where no pit is formed may occur between the address and the address position B. In this case, it is desirable to take the following measures. That is, when A is smaller than B, the address position (A + 1) to the address position (B−
Silence data is additionally recorded in the section up to 1), and when A is equal to B or when A is greater than B, silence data is additionally recorded in a predetermined time section including zero from the address position (A + 1).

[0033]

As described above, according to the write-once optical disc recording / reproducing apparatus of the present invention, pits are always formed even if a track jumps or goes out of focus due to scratches or disturbance (shock) on the disc. Only discs that can be played on a CD player are obtained. Further, during recording, even if the next track is additionally recorded on the track in which the abnormality has occurred, no overlap recording portion is formed at the head of the track next to the track in which the abnormality has occurred, so that generation of noise can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a write-once optical disc recording / reproducing apparatus according to the present invention.

FIG. 2 is a timing chart when recording is interrupted due to a track jump in the outer peripheral direction (when address A <address B).

FIG. 3 is a diagram showing a synchronization standard for a positional relationship between subcode data to be recorded and an ATIP.

FIG. 4 is a timing chart of an operation for additionally writing silent data in the embodiment of the present invention.

FIG. 5 is a diagram for explaining an operation of the embodiment of the present invention when address information is not obtained continuously (four times) during recording.

FIG. 6 is a diagram for explaining the operation of the embodiment of the present invention when address information is not obtained continuously (four times) during recording.

FIG. 7 is a diagram showing overlapping recording of pits in the embodiment of the present invention.

FIG. 8 is a diagram showing a track jump state during recording.

FIG. 9 is a diagram showing a linking standard.

FIG. 10 is a diagram showing a sequence for interrupting pit formation due to out-of-focus (out-of-focus) during recording in a conventional apparatus.

FIG. 11 is a diagram showing a conventional pit overlap recording state.

[Explanation of symbols]

 Reference Signs List 1 optical disk 2 optical pickup 3 signal processing unit 4 system controller 5 mechanical control unit 6 key matrix 7 display unit 8 D / A converter 9 A / D converter

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B ^7/ 00-7/013 G11B 19/02 501 G11B 19/04 501 G11B 27/10

Claims (7)

(57) [Claims] A write-once optical disc recording / reproducing apparatus for recording / reproducing information on / from a recordable optical disc monitors the continuity of the address of a track obtained from the optical disc during recording, and when the continuity is lost, A write-once optical disc recording / reproducing apparatus, wherein the recording operation is immediately interrupted and silent data is additionally recorded for a predetermined time length from the last address A where continuity is maintained. 2. A write-once optical disc recording / reproducing apparatus for recording / reproducing information on / from a recordable optical disc, if the address information of a track obtained from the optical disc cannot be obtained a predetermined number of times during recording, the recording operation is immediately performed. A write-once optical disc recording / reproducing apparatus for recording silent data for a predetermined time length from an address position next to the last obtained address. 3. A write-once optical disc recording / reproducing apparatus for recording / reproducing information on / on a recordable optical disc, wherein continuity of a track address obtained from the optical disc is monitored during recording, and when the continuity is lost, The recording operation is immediately interrupted, and the last address A where continuity is maintained is maintained.
Is compared with the address B immediately after the recording is interrupted. When A is smaller than B, silent data is additionally recorded in the section from the address position (A + 1) to the address position (B-1), and when A is equal to B. , Or when A is greater than B, a write-once optical disc recording / reproducing apparatus which additionally records silent data in a predetermined time interval including zero from the address position (A + 1). 4. When the address A is equal to or higher than the address B immediately after the recording is interrupted, the silent data is additionally recorded at the next address position of the address A.
13. A write-once optical disc recording / reproducing apparatus according to claim 1. 5. The method according to claim 1, wherein when the address A is smaller than the address B, silent data is additionally recorded from an address position next to the address A to an address position immediately before the address B. Write-once optical disc recording and reproducing device. 6. The write-once optical disc recording / reproducing apparatus according to claim 1, further comprising a display unit for notifying an abnormal state indicating interruption of said recording operation. 7. The write-once optical disc recording / reproducing apparatus according to claim 1, wherein reception of operation instruction information by a key operation is prohibited during a period from interruption of the recording operation to additional recording of silence data.