JP3790301B2 - Optical disc and optical disc recording apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The invention, and the optical disk for recording continuous data on a plurality of tracks, an optical disk recording equipment for recording on the optical disc by a plurality of light beams.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as one means for increasing the data transfer speed of an optical disc apparatus, an apparatus that simultaneously reproduces a plurality of tracks on the optical disc has been proposed. For example, an optical disk reproducing device disclosed in Japanese Patent Laid-Open No. 6-89440 will be described with reference to FIG. When the host interface 10 receives a playback instruction for the adjacent tracks T1 to T3 on the optical disc 1 from the host device via the terminal 11, the controller 12 performs a playback operation by issuing an instruction to each unit. First, the optical disk 1 is rotated by the spindle motor 2, and the feed motor 6 is controlled to position the optical pickup 5 on the tracks T1 to T3. The tracks T1, T2, and T3 on the optical disc 1 are irradiated with laser beams from the light emitting elements 31, 32, and 33, and the reflected light is converted into electric signals by the light receiving elements 41, 42, and 43, and the reproducing circuit 71, 72 and 73 are used for independent reproduction. The data reproduced independently for each track is temporarily stored in the buffer memory 9 via the memory control circuit 8, and then the same order as the track arrangement on the optical disc 1 (that is, the order of T1, T2, T3). ) And sent from the terminal 11 of the host interface 10 to the host device.
[0003]
As a result, a plurality of tracks are simultaneously read using a plurality of light beams, stored in a buffer memory, and read out in the same order as the arrangement of the tracks on the optical disk, thereby increasing the data transfer speed. Furthermore, power consumption is reduced by reducing the rotational speed of the disk without reducing the transfer speed.
[0004]
[Problems to be solved by the invention]
In the conventional optical disc reproducing apparatus, three tracks are read at the same time. However, if the total number of tracks instructed to reproduce is not an integral multiple of 3, the last half track must be read. In other words, necessary data and unnecessary data are reproduced at the same time during the last rotation, but only necessary data is stored in the buffer memory, so unnecessary data is not stored. For example, when there is an instruction to reproduce tracks T 1 to T 4 in FIG. 9, data for three tracks is reproduced and stored in the buffer memory 9 in the first rotation. However, in the second rotation, only one track of data is necessary, and the remaining two tracks of data were not stored in the buffer memory 9 even though they were reproduced with great effort.
[0005]
The present invention effectively utilizes the read unnecessary data by storing it in the cache memory without discarding it, and outputs the data from the cache memory in response to a subsequent reproduction instruction, thereby tracking the light beam to the adjacent track. An object of the present invention is to provide an optical disc, an optical disc recording apparatus, and an optical disc reproducing apparatus capable of transferring data immediately without performing an operation. Furthermore, when data is stored from a plurality of tracks into the cache memory, priority is given between the tracks, so that data with high priority is stored in the cache memory and the memory capacity is effectively utilized.
[0006]
[Means for Solving the Problems]
The optical disk according to claim 1, wherein n × m tracks are formed by n spirals, each of the n tracks is one track bundle, and the track bundle includes m bundles of tracks. Track priority of data recording is set in the order of tracks 1, 2,..., N, and track bundle priority of data recording between the track bundles is the order of track bundles 1, 2,. When data is recorded across multiple tracks, the data is recorded based on the track priority order, and when data is recorded across multiple track bundles, the track priority is recorded. Data is recorded with the track bundle priority order preceding the rank order.
[0007]
The optical disk recording apparatus according to claim 2, wherein n × m tracks are formed by n spirals, each n tracks are defined as one track bundle, and data is recorded on an optical disk composed of m bundles of tracks. In the optical disk recording apparatus, the track priority of data recording in the track bundle is set in the order of tracks 1, 2,..., N, and the track bundle priority of data recording between the track bundles is set to the track bundle. When data is recorded across a plurality of tracks, the data is recorded based on the track priority, and the data is recorded across a plurality of track bundles. In this case, the recording order determination procedure is to determine the recording order of the tracks by making the track bundle priority precede the track priority. If, based on the recording order in which they are outputted from the recording order determination means, characterized by having a recording means for recording data.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram for explaining an optical disk according to the present invention. In the optical disk, tracks are formed by n (n ≧ 2) spirals T1 to Tn, and the total number of tracks becomes n × m (m ≧ 2). Further, n tracks corresponding to one set of spirals are defined as one track bundle, and the total of F1 to Fm is m bundles. Therefore, an arbitrary track can be represented by (F _i , T _j ) (where i = 1, 2,..., M, j = 1, 2,..., N). In the present embodiment, assuming that n = 3, the optical disc 1 has tracks formed by three spirals T1 to T3, and the total number of tracks is 3 × m. For example, continuous data such as music information and video information and continuous data with a large file capacity are recorded by imprinting uneven pits on the tracks of the disk.
[0010]
When recording continuous data across a plurality of tracks of the optical disc 1, the priority of data recording in the track bundle Fi is set in the order of tracks T1, T2, and T3, and the track with the highest priority is set. Is T1, and the track with the lowest priority is T3. Further, when recording is performed across a plurality of track bundles, the priority of data recording between the track bundles is set in the order of the track bundles F1, F2,... Fm, and the track bundle with the highest priority is set as the track bundle. Let F1 be the track bundle Fm having the lowest priority. Further, if the continuous data is not well separated and the immediately preceding continuous data ends with the track (F _i , T ₁ ), the head of the recording does not need to be the track T1 but needs to be T2. Therefore, the data is recorded in order on the empty track with the track bundle priority order preceding the track priority order. As a result, the next continuous data is recorded in order from (F _i , T ₂ ), no empty track is generated, and the recording area can be used effectively.
[0011]
FIG. 2 is a diagram for explaining an optical disk recording apparatus for recording continuous data on the optical disk. If the optical disc 1 is a read-only optical disc in which continuous data is imprinted by the concave and convex pits as described above, the master disc of the optical disc can be recorded by this optical disc recording apparatus, and a large number of optical discs can be duplicated. If the optical disk 1 is a rewritable disk such as a magneto-optical disk or a phase change disk, the track is preliminarily carved as a guide groove, and continuous data is recorded by the optical disk recording apparatus. In both types of discs, the continuous data recording method is the same.
[0012]
A track formed by a plurality of spirals on the optical disc 1 is irradiated with a light beam from the optical pickup 5 to record continuous data. Even if this light beam is a single beam, it can be recorded on different spirals if recording is performed while sequentially performing track jumps, so that recording can be performed on all tracks. However, since the three light beams b1 to b3 of the same number as the spiral are provided as shown in the figure, the recording speed is tripled and the jump operation is unnecessary, so this example will be described below.
[0013]
In FIG. 2, when the host interface 10 receives an instruction to record continuous data from the host device to the optical disc 1 via the terminal 11, the controller 12 performs a recording operation by issuing an instruction to each unit. First, the optical disk 1 is rotated by the spindle motor 2, and three light beams b 1 to b 3 are emitted from the light emitting elements 31 to 33 in the optical pickup 5 to the optical disk 1. The feed motor 6 moves the optical pickup 5 based on an instruction from the controller 12, and positions the light beams b1 to b3 on the spirals T1 to T3 to be recorded. The recording data d0 is input to the buffer memory 101, and after being divided into a plurality of blocks for recording by the recording method determining means 102 for each track by the following method, the recording order of the blocks is determined, and the recording circuits 103 to 105 are recorded. Are sequentially recorded on the recording track.
[0014]
FIG. 3 is a diagram showing a method of recording continuous data by dividing it into a plurality of blocks. First, continuous data is divided into a plurality of blocks B1 to Bk. The capacity of one block corresponds to the capacity of one track. For example, it is assumed that recording of the immediately preceding continuous data has been completed on the track T1 of the track bundle Fi. Then, it becomes the first track (F _i , T ₂ ) of recording, but when the amount of recording data is large, it is necessary to record across a plurality of track bundles. At this time, the next block B2 is recorded on the track (F _i , T ₃ ). When there are three light beams, the two blocks B1 and B2 are first recorded by the light beams b2 and b3. The light beam b1 is not recorded. When the optical disk 1 is rotated once, the blocks B3 to B5 are recorded on the tracks (F _{i + 1} , T ₁ ) to (F _{i + 1} , T ₃ ) using the light beams b1 to b3. Recording is performed in the following order, and the last block Bk is recorded on the track (F _j , T ₂ ). This completes the recording of continuous data. When the next continuous data is recorded, it is recorded from the track (F _j , T ₃ ). As described above, when the immediately preceding continuous data ends in the middle of the block bundle, the data is recorded with the track bundle priority order preceding the track priority order. As a result, recording is performed sequentially from the middle track of the bundle of tracks, and the recording area can be effectively used without generating empty tracks.
[0015]
FIG. 4 is a flowchart showing an operation when continuous data is recorded by the optical disk recording apparatus. First, recording data is fetched from the host interface and stored in the recording buffer memory (S41). The data is divided into blocks by the recording order determining means (S42). The order of tracks for recording each block is determined (S43). The data of each block is read from the recording buffer memory by the recording circuit and recorded on the allocated track (S44).
[0016]
Next, an embodiment of an optical disk reproducing apparatus for reproducing the optical disk 1 recorded by the optical disk recording apparatus will be described with reference to FIG. First, when the host interface 10 receives an instruction to reproduce continuous data on the optical disc 1 from the host device via the terminal 11, the controller 12 performs the reproducing operation by issuing an instruction to each unit. First, the optical disk 1 is rotated by the spindle motor 2, and the feed motor 6 is controlled to position the optical pickup 5 in the spirals T1 to T3. The spiral T1, T2, and T3 on the optical disc 1 are irradiated with laser beams b1 to b3 from the semiconductor lasers 31, 32, and 33, respectively, and the reflected light is converted into electric signals by the light receiving elements 41, 42, and 43, and reproduced. Reproduction is performed independently by the circuits 71, 72, 73. Data reproduced independently for each spiral is temporarily stored in the cache memory 13 via the cache memory control circuit 8 and then sent from the terminal 11 of the host interface 10 to the host device. The memory management table 14 stores management information corresponding to track unit data stored in the cache memory 13. The cache memory 13 and the memory management table 14 are controlled by the controller 12 and the cache memory control circuit.
[0017]
A method for reproducing data recorded on a plurality of tracks in the above-described optical disc reproducing apparatus will be described with reference to FIG. As described above, the first track of recording is the track (F _i , T ₂ ), and since the amount of recording data is large, recording is performed across a plurality of track bundles. Of the three light beams, first, the block B1 recorded on the track (F _i , T ₂ ) and the block B2 recorded on the track (F _i , T ₃ ) are reproduced by the light beams b2 and b3. To do. The light beam b1 is not reproduced. When the optical disk 1 rotates once, the blocks B3 to B5 are reproduced from the tracks (F _{i + 1} , T ₁ ) to (F _{i + 1} , T ₃ ) using the light beams b1 to b3. Reproduction is performed in the following order, and the last block Bk is reproduced from the track (F _j , T ₂ ). This completes the reproduction of the continuous data. When reproducing the next continuous data, the reproduction is not started from the track (F _j , T ₃ ), and the block B1 ′ read out excessively from this track is stored in the cache memory as will be described later. Thus, the reproduction operation can be omitted.
[0018]
FIG. 6 is a schematic diagram showing the correspondence between the cache memory 13 and the memory management table 14. The cache memory 13 is divided into, for example, ten storage areas ar1 to ar10, and block data for one track is stored for each area. On the other hand, the memory management table 14 is composed of portions for storing track address information ad1 to ad10, flag information fl1 to fl10, and priority information pr1 to pr10, which correspond to the areas ar1 to ar10 of the cache memory 13, respectively. To do. When data is stored in the cache memory 13, addresses indicating the tracks are stored in ad1 to ad10. If the data in the cache memory is transferred to the host computer, the flag information of the transferred area is [0], and if it is not transferred, it is [1]. That is, when the flag information is [1], it is necessary to leave the data in the cache memory, and when it is [0], it is not necessary. Further, as will be described later, priority information that has a higher priority as it is closer to the first block of continuous data is stored in the memory management table. Thus, as the cache memory is filled with data, data closer to the first block can be preferentially stored in the cache memory. As a result, the head block data can be preferentially transferred from the cache memory to the host computer during access of the optical pickup, and the access time can be apparently improved.
[0019]
FIG. 7 is a flowchart showing the flow of the reproducing operation in the disk reproducing apparatus. First, a reproduction instruction for tracks (Fi, T2) to (Fj, T2) is given from the host computer to the controller via the host interface (S1). The controller first checks whether the track number (Fi, T2) instructed to be reproduced exists in the memory management table from among the flag information [1] indicating that data is stored in the cache memory ( S2). It is determined whether or not the data of the track (Fi, T2) instructed to be reproduced exists in the cache memory (S3). If it exists in the cache memory, the process of S7 is performed, and if it does not exist, the process of S4 is performed. In the example of FIG. 3, it is determined that the tracks (Fi, T2) and (Fi, T3) exist on the cache memory, and the process proceeds to S7. Next, since it is not the last block, the next track is processed, and the process proceeds to S3 and S4 again. It is determined that there is no track (F _{i + 1} , T ₂ ), and the optical pickup is adjacent to this track. One track is accessed (S4). The data for these three tracks are simultaneously reproduced by three multi-beams and stored in the corresponding block of the cache memory (S5). The track number, flag information, and priority information in the memory management table are updated (S6). It is determined whether or not the processing has been completed for all the tracks for which reproduction has been instructed. If not, the process returns to S2 to process the next track (S7). On the other hand, if all the tracks have been processed, the data of the reproduction instruction track stored in the cache memory is transferred from the terminal 11 to the host via the memory control circuit 8 and the host interface 10 in accordance with an instruction from the controller (S8). ). An end of reproduction processing is notified to the host (S9).
[0020]
Note that once the cache memory is filled by the above operation, new data with high priority is stored while erasing unnecessary data by the following method. The controller refers to the memory management table and first searches for an area of the cache memory whose flag information is [0], that is, invalid. If there is an invalid area, the block data and the newly stored block data are exchanged and stored. If there is no invalid area, the following method is used to search for block data with as low a priority as possible. The track priorities are set in the order of T1, T2, and T3 from the highest, and similarly the track bundle priorities are also set in the order of the track bundles F1, F2, and Fm. In consideration of the fact that the beginning of the recording is in the middle of the track bundle, the track bundle priority is set ahead of the track priority. According to this rule, the priority information is stored in the memory management table so that the priority is higher in the first block of continuous data and lower in the last block. By replacing with new data based on this priority information, the last block is more easily replaced with new data, and the first block of continuous data is left in the cache memory as the first priority. As described above, when data is stored in the cache memory, the priority information together with the address information indicating the track number is written in the memory management table, and the flag information corresponding to the stored area is set to [1]. The first block of data can be left in the cache memory as the first priority, and by reading this data during access, the access time can be shortened in a pseudo manner.
[0021]
FIG. 8 is a diagram showing the contents of the cache memory and the memory management table stored according to the flowchart. A description will be given from a state (a) in which some continuous data has already been reproduced and the cache memory is full. Data stored in the cache memory can be distinguished by flag information [0] and [1] and priority information [1], [2],... As shown in the memory management table. The data that has already been sent to the host has the flag information [0], and the data that has not been sent is [1]. In addition, since the priority is higher in one continuous data that is closer to the first block, for example, the priority information of the first block is [1], and the subsequent block is [2]. When the controller receives a reproduction instruction from the host, it first searches for an area that is flag information [0], and transfers the reproduced data to the host using this area as a buffer. When data is transferred sequentially, blocks that have not been sent remain in the cache memory because the flag information is [1].
[0022]
When reproduction of several continuous data is repeated, the area where the flag information is [0] eventually disappears as shown in (b), and all become [1]. In this state, since there are three light beams, only priority information [1] and [2] remain. Next, the controller searches for a low priority (in this case, [2]), and similarly transfers data to the host using this area as a buffer. When data is transferred sequentially, the blocks that have not been sent remain in the cache memory because the priority information is [1]. Further, when the reproduction of several continuous data is repeated, only the area whose priority order information is [1] will eventually remain, and the higher priority can be left in the cache memory as shown in (c). In addition, since it also serves as a buffer memory for transferring data to the host computer, an area where the flag information is [0] and an area where the priority information is other than “1” are secured at a minimum. For convenience of explanation, only the cache memory area has been described. In addition, when all the priority information becomes [1], it is preferable to reject the data in ascending order of use frequency.
[0023]
In the above description, the embodiment using three light beams has been described. However, the present invention is not limited to this, and the present invention can be similarly applied to the case of irradiating a multi-beam to four or more spirals.
[0024]
【The invention's effect】
According to the optical disc and the optical disc recording apparatus described above, continuous data extending over a plurality of tracks is recorded on the optical disc while determining the recording order on the tracks .
[Brief description of the drawings]
FIG. 1 is a diagram showing an optical disc of the present invention.
FIG. 2 is a diagram showing an optical disk recording apparatus of the present invention.
FIG. 3 is a diagram showing a recording order by the optical disk recording apparatus of FIG. 2;
4 is a flowchart of a recording operation in the optical disc recording apparatus of FIG.
FIG. 5 is a diagram showing an optical disc reproducing apparatus according to the present invention.
6 is a diagram showing a configuration of a cache memory and a memory management table in FIG. 5. FIG.
7 is a flowchart of a reproducing operation in the optical disc reproducing apparatus of FIG.
FIG. 8 is a diagram for explaining the contents of a cache memory and a management table that are rewritten by the flowchart of FIG. 5;
FIG. 9 is a block diagram of a disk reproducing device for explaining the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Optical disk 2 Spindle motor 31, 32, 33 Light emitting element 41, 42, 43 Light receiving element 5 Optical pick-up 6 Feed motor 71, 72, 73 Playback circuit 8 Cache memory control circuit 10 Host interface 11 Terminal 12 Controller 13 Cache memory 14 Memory management Table 101 Recording buffer memory 102 Recording order determining means 103, 104, 105 Recording circuit

Claims (2)

In an optical disc comprising n × m tracks formed by n spirals, each n tracks being one track bundle, and m bundles of tracks.
Track priority of data recording within the track bundle is set in the order of tracks 1, 2,..., N, and track bundle priority of data recording between the track bundles is set to track bundle 1, 2,. , M in order,
When data is recorded across a plurality of tracks, the data is recorded based on the track priority order. When data is recorded across a plurality of track bundles, the data is recorded over the track priority order. An optical disc in which data is recorded with a track bundle priority order first. In an optical disc recording apparatus in which n × m tracks are formed by n spirals, each n tracks are formed as one track bundle, and data is recorded on an optical disc composed of m bundles of tracks.
Track priority of data recording within the track bundle is set in the order of tracks 1, 2,..., N, and track bundle priority of data recording between the track bundles is set to track bundle 1, 2,. , M in order,
When recording data across a plurality of tracks, the data is recorded based on the track priority order. When recording data across a plurality of track bundles, the track bundle is more than the track priority order. A recording order determining means for determining the recording order of the tracks by prioritizing the priorities;
An optical disc recording apparatus comprising recording means for recording data based on the recording order output from the recording order determining means.

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