JP2007172748A - Reproducing device, recorder, reproducing method and recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the recording density of a recording medium from being reduced by effectively utilizing a linking area provided between recording blocks. <P>SOLUTION: Reference timing TM is detected from an MSK mark of a wobbling WBL. A start position amount SP is also calculated in accordance with an added value between a random number RND that gives the same value to the whole recording blocks and an arbitrary embedded data INF. Then, by delaying a clock for the start position value SP from the reference timing TM, actual recording start timing ST is generated to record data in synchronization with the recording start timing ST. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a reproducing apparatus, a recording apparatus, a reproducing method, and a recording method, and is particularly suitable for recording and reproducing data in units of blocks.

  As a technique for recording / reproducing digital data, there is a data recording technique using an optical disc such as a CD or a DVD as a recording medium. In recent years, Blu-ray discs (BD) and the like that have achieved higher density are appearing.

  When reproducing data from these optical disks, the reproducing apparatus irradiates a recording medium, which is a disk in which a thin metal plate is protected with plastic, with a laser beam, and reads a signal by a change in the reflected light. Optical discs are recordable and reproducible, such as CD-ROM, DVD-ROM and other playback-only types, and CD-R, CD-RW, DVD-R, DVD-RW, DVD + R, DVD + RW, and DVD-RAM. There are some types. Types that can be recorded and reproduced include the dye film change method and the phase change recording method. The dye film change recording method can record data only once, whereas the phase change recording method rewrites data many times. It is possible. In a read-only disc, data is recorded by forming embossed pits on the disc, and basically error correction block units are continuous and recorded without interruption.

  On the other hand, although data is recorded in error correction block units even in a recordable / reproducible disc, a linking area (buffer area) exists between the blocks in consideration of random accessibility and joint recording. In addition, it is known that the phase change recording type recording medium will deteriorate the characteristics of the recording medium if the same data is recorded many times in the same place. Therefore, an SPS (start position shift) technique for intentionally shifting the recording start position is known. Patent Document 1 describes that this linking area (buffer area) is also used to perform this SPS.

JP 2004-30848 A

  However, in the configuration of the conventional technique described in Patent Document 1, the linking area used for realizing “random access”, “connecting recording”, “SPS”, and the like functions only as a buffer area, It is not possible to record valid data. That is, the recording density of the recording medium is reduced accordingly.

  The present invention has been made in view of such problems, and an object of the present invention is to effectively reduce the recording density of a recording medium by effectively utilizing a linking area provided between recording blocks.

The reproducing apparatus of the present invention is a reproducing apparatus for reproducing data composed of a plurality of recording blocks from an optical recording medium, a detection means for detecting a reference timing of the recording medium, and a recording block for reproducing the data at the recording timing. A reproduction timing detection means for detecting each time, a timing difference detection means for detecting a difference between the reference timing and the reproduction timing, a difference between the reference timing of the first recording block in the data and the reproduction timing, The relative difference detection means for detecting the relative difference between the reference timing of the second and subsequent recording blocks in the data and the reproduction timing, and the relative difference detected by the relative difference detection means, the data Embedded data embedded in the linking area in the recording block at the time of recording It characterized by having a reproduction means for reproducing.
The recording apparatus of the present invention is a recording apparatus for recording data consisting of a plurality of recording blocks on an optical recording medium, the detection means for detecting the reference timing of the recording medium, and the second and subsequent data in the data Generating means for generating embedded data to be embedded in the recording block, determining means for determining a shift amount from the reference timing for the plurality of recording blocks, and determining the reference timing with respect to the reference timing Recording means for recording the data on the recording medium for each of the plurality of recording blocks by shifting a shift amount, and the determining means determines the second and subsequent recording blocks according to the embedded data. A shift amount is determined, and the recording means embeds the embedded data in a linking area in the recording block. And features.

The reproducing method of the present invention is a reproducing method for reproducing data composed of a plurality of recording blocks from an optical recording medium, wherein a detecting step for detecting a reference timing of the recording medium, and the reproduction timing of the data are recorded in the recording block. A reproduction timing detection step for detecting each time, a timing difference detection step for detecting a difference between the reference timing and the reproduction timing, a difference between the reference timing and the reproduction timing of the first recording block in the data, Using the relative difference detection step for detecting a relative difference between the difference between the reference timing and the reproduction timing of the second and subsequent recording blocks in the data, and using the relative difference detected by the relative difference detection step, the data In the linking area in the recording block when recording And having a reproduction step of reproducing or buried data.
The recording method of the present invention is a recording method for recording data consisting of a plurality of recording blocks on an optical recording medium, the detection step for detecting the reference timing of the recording medium, and the second and later in the data A generation step for generating embedded data to be embedded in the recording block, a determination step for determining a shift amount from the reference timing for the plurality of recording blocks, and a determination step with respect to the reference timing A recording step of shifting the shift amount and recording the data on the recording medium for each of the plurality of recording blocks, and the determining step includes the second and subsequent recording blocks in accordance with the embedded data. A shift amount is determined, and the recording step converts the embedded data into the recording block. And wherein the embedding in the trunking area.

  According to the present invention, since the shift amount of the recording block is determined according to the embedded data and the embedded data is embedded in the linking area in the recording block, the linking area is effectively used to record on the recording medium. A decrease in density can be prevented.

Next, an embodiment of the present invention will be described with reference to the drawings.
First, an example of the data structure of a recording block will be described with reference to FIG.
In FIG. 1, RI is a run-in area, DT is a recording data area, and RO is a run-out area. The run-in area RI is an area in which AGC (Auto Gain Control) and PLL (Phase Locked Loop) are drawn during reproduction, and records, for example, a 3T / 3T / 2T / 2T / 5T / 5T repetitive pattern. Here, “T” indicates a data bit interval, and the state is inverted by “1”.

  In the data area DT, the head synchronization signal SY0 indicating the head is recorded first, then the modulation data DT0 is recorded, the second synchronization signal SY1 is then recorded, and the second modulation data D1 is further recorded. . The combination of the synchronization signal SYn and the data Dn is recorded 496 times in the data area DT. The runout area RO is a buffering area for linking. Similar to the run-in area RI, a repetitive pattern of 3T / 3T / 2T / 2T / 5T / 5T is recorded in the run-out area RO.

  With the above configuration, one recording block is configured. This one recording block is the minimum recording unit. When data is continuously recorded, a plurality of recording blocks are recorded. The runout area RO is a linking area between recording blocks adjacent to each other, and serves as a buffer area for the preceding and subsequent recording blocks. Accordingly, the area length of the runout area RO changes depending on the positional relationship with the preceding and subsequent recording blocks. However, there is no subsequent recording block in a single recording block or the last recording block of consecutive recording blocks. Therefore, the recording length of the runout area RO in these recording blocks is set to the maximum length.

  In the recording medium 30 (see FIG. 2), recording tracks formed in a spiral form meandering (wobble) in the radial direction, and address information (ADIP) is embedded in the wobble WBL. Further, the reference timing TM of the recording medium 30 can be obtained from a portion (MSK mark) whose phase is inverted by 180 °. In the example shown in FIG. 1, the recording block is recorded from the reference timing TM, but actually the recording block is recorded from a position shifted backward with reference to the reference timing TM. This will be described later.

FIG. 2 is a block diagram showing an example of the configuration of the disk recording / reproducing apparatus.
Here, an example of the flow of recording data will be described with reference to FIG.
The video imaged by the imaging device 1 is subjected to video processing by the video processing unit 2, subjected to error correction encoding processing by the ECC encoding unit 3, and further subjected to 17PP (Parity Preserve / prohibit RMTR) modulation by the modulation unit 4. The As a result, modulation data is generated.
The light emission control unit 5 instructs the light emitting unit 6 to emit the semiconductor laser in accordance with the modulation data generated as described above. Then, the light emitting unit 6 generates laser light. As a result, the laser beam is converged on the recording medium 30 via the converging lens 7 and recording of the modulation data is performed. The recording medium 30 is rotationally controlled by a spindle motor 31. The recording data processing unit 33 includes the above-described video processing unit 2, ECC encoding unit 3, and modulation unit 4. The recording data processing unit 33 performs recording processing in synchronization with the recording start timing ST output from the shift circuit 13.

Here, generation of the recording start timing ST will be described.
Prior to recording data, the CPU 14 rotates the spindle motor 31. As described above, the light emission control unit 5 causes the light emission unit 6 to emit light with the reproduction power, and the condenser lens 7 converges the laser light on the recording medium 30. The laser beam reflected on the recording medium 30 is converted into an electric signal by the light receiving unit 8, and the wobble WBL is detected by the ADIP detection unit 9. The ADIP detector 9 detects the address information on the recording medium 30 from the wobble WBL and also detects the reference timing TM of the recording medium 30. In addition, the wobble WBL and the reference timing TM are detected during recording and reproduction.

  The CPU 14 generates a random number RND in the random number circuit 15 for SPS (Start Position Shift). When recording blocks are continuously recorded, the random number RND is set to the same value in each recording block. The adder 16 adds the embedded data INF output from the embedded data generation circuit 18 and the random number RND output from the random number circuit 15. The remainder circuit 17 calculates a remainder with respect to “318” of the output value from the adder 16 and calculates a start position amount SP. Since the settable range of the start position amount SP is 0 to 317, the remainder position 17 stores the start position amount SP within the range.

  Note that the embedded data generation circuit 18 is not operated in the first recording block when data is continuously recorded. The embedded data generation circuit 18 is operated for the second and subsequent recording blocks. Values that can be set as embedded data are “0” to “317”. When N recording blocks are continuously recorded, information of (318 × (N−1)) bits can be superimposed on the linking area as embedded data.

  It is assumed that the random number circuit 15 gives each recording block the same value as the value of the random number RND determined in the first recording block. The shift circuit 13 generates an actual recording start timing ST by delaying a clock corresponding to the start position amount SP from the reference timing TM. Data recording is performed in synchronization with the recording start timing ST.

  FIG. 3 shows a state when recording blocks are recorded in three consecutive blocks. The reference timing TM is detected from the MSK mark of the wobble WBL, and the recording start timing ST is generated based on the reference timing TM. When the delay shift amounts from the reference timing TM to the recording start timing ST in the first, second, and third recording blocks are respectively A, B, and C, the value of the embedded data INF is (B−A) or ( C-A).

FIG. 4 is a diagram showing an example of the relationship between the random number RND, the embedded data INF, and the recording start timing ST.
FIG. 4A shows an example in which the random number RND is “200” and the embedded data INF is “20”, and the recording start timing ST is “220”. FIG. 4B shows an example in which the random number RND is “200” and the embedded data INF is “220”, and the recording start timing ST is “102”.

  In order to increase the reliability of the embedded data INF, an error correction code may be encoded in the embedded data INF itself. Further, whether or not the embedded data INF is superimposed may be recorded in the normal data so that it can be determined whether or not the embedded data at the time of reproduction should be decoded.

Next, an example of the flow of reproduction data will be described with reference to FIG. The detection of the reference timing TM is the same as that at the time of recording and will not be described.
The output from the light receiving unit 8 is binarized by the RF detection unit 10 to become reproduction data, and the sync signal SY0 is detected by the SYNC detection unit 19 to synchronize the recorded blocks. The reproduction data obtained by the RF detector 10 is 17PP demodulated by the demodulator 21, subjected to error correction decoding by the ECC decoder 22, and further subjected to video signal processing by the video processor 23. The demodulating unit 21, the ECC decoding unit 22, and the video processing unit 23 are provided to constitute a reproduction data processing unit 32. The counter 20 is a counter that is reset based on the reference timing TM output from the ADIP detection unit 9.
FIG. 5 shows an example of the relationship between the wobble WBL and the count value of the counter 20. In the latch circuit 24, the output value CT of the counter 20 is latched at the timing of the head synchronization signal SY0 and sent to the CPU 14. The CPU 14 records the output from the latch circuit 24 in each recording block in the memory 25.

  As is apparent from FIG. 5, the output of the latch circuit 24 indicates the distance between the head synchronization signal SY0 of the data portion of each recording block and the reference timing TM of the wobble WBL. Since the length of the run-in RI in each recording block is a fixed length, the relative value between the output of the latch circuit 24 in the first recording block and the output of the latch circuit 24 in the subsequent recording block is superimposed during recording. It becomes embedded data INF. In FIG. 5, if the output values of the latch circuit 24 in the first recording block, the second recording block, and the third recording block are H, I, and J, respectively, the embedded data INF superimposed at the time of recording is (I− H) and (J-H).

However, since the remainder calculation for “318” is performed by the remainder circuit 17 at the time of recording, it is necessary to perform the inverse remainder calculation. FIG. 6 is a flowchart illustrating an example of processing performed by the CPU 14 when performing inverse remainder calculation.
First, in step S1, it is determined whether or not the output I of the latch circuit 24 in the second recording block is larger than the output H of the latch circuit 24 in the first recording block. As a result of the determination, if the output I of the latch circuit 24 in the second recording block is larger than the output H of the latch circuit 24 in the first recording block, the process proceeds to step S2 and remains (IH). Calculate

  On the other hand, if the output I of the latch circuit 24 in the second recording block is not larger than the output H of the latch circuit 24 in the first recording block, the process proceeds to step S3, and (I + 318-H) is calculated. Thus, the embedded data INF superimposed at the time of recording is obtained. In FIG. 6, the case of calculating (I−H) is taken as an example. However, in the case of calculating (J−H) and the like, only I is replaced with J, and the process is the same as the flowchart of FIG. Processing can be performed. The CPU 14 reads the output value (I, J, H in the above example) of the latch circuit 24 in each recording block from the memory 25 and performs the calculation shown in FIG.

  As described above, in this embodiment, the reference timing TM is detected from the MSK mark of the wobble WBL. Further, the start position amount SP is calculated according to the added value of the random number RND given the same value to all the recording blocks and the arbitrary embedded data INF. The actual recording start timing ST is generated by delaying the clock corresponding to the start position amount SP from the reference timing TM, and data is recorded in synchronization with the recording start timing ST. Accordingly, “random access”, “continuous recording”, and “SPS” for reducing characteristic deterioration during repeated recording can be performed by the linking area, and the linking area can be effectively used as the recording area. Capacity can be improved.

In this embodiment, the case where both the recording operation and the reproducing operation are performed by one apparatus has been described as an example. However, a reproduction-only apparatus and a recording-only apparatus may be used. In the case of the reproduction-only device, only the block that performs the reproduction process is necessary among the blocks shown in FIG. 2, and in the case of the recording-only device, only the block that performs the recording process is necessary.
In the present embodiment, the run-out area RO is a linking area, but the run-in area RI may be a linking area instead of or in addition to the run-out area RO.

(Other embodiments of the present invention)
In order to operate various devices to realize the functions of the above-described embodiments, program codes of software for realizing the functions of the above-described embodiments are provided to an apparatus or a computer in the system connected to the various devices. You may supply. What was implemented by operating said various devices according to the program stored in the computer (CPU or MPU) of the system or apparatus is also included in the category of the present invention.

  In this case, the program code of the software itself realizes the functions of the above-described embodiment. The program code itself and means for supplying the program code to a computer, for example, a recording medium storing the program code constitute the present invention. As a recording medium for storing the program code, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.

  Further, the functions of the above-described embodiments are not only realized by executing the program code supplied by the computer. It goes without saying that the program code is also included in the embodiment of the present invention even when the function of the above-described embodiment is realized in cooperation with an operating system or other application software running on the computer. Yes.

Further, after the supplied program code is stored in the memory provided in the function expansion board of the computer, the CPU provided in the function expansion board performs part or all of the actual processing based on the instruction of the program code. Needless to say, the present invention includes the case where the functions of the above-described embodiments are realized by the processing.
Further, after the supplied program code is stored in the memory provided in the function expansion unit connected to the computer, the CPU or the like provided in the function expansion unit performs part or all of the actual processing based on the instruction of the program code. Do. Needless to say, the present invention includes the case where the functions of the above-described embodiments are realized by the processing.

  Note that each of the above-described embodiments is merely a specific example for carrying out the present invention, and the technical scope of the present invention should not be construed as being limited thereto. . That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.

It is a figure which shows embodiment of this invention and shows an example of the data structure of a recording block. 1 is a block diagram illustrating an exemplary configuration of a disk recording / reproducing device according to an embodiment of the present invention. It is a figure which shows the mode when the embodiment of this invention is shown and a recording block is recorded on 3 blocks continuously. FIG. 10 is a diagram illustrating an example of a relationship between a random number, embedded data, and recording start timing according to the embodiment of this invention. It is a figure which shows embodiment of this invention and shows an example of the relationship between a wobble and the count value of a counter. It is a flowchart which shows embodiment of this invention and shows an example of a process of CPU at the time of performing an inverse remainder calculation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image sensor 5 Light emission control part 6 Light emission part 7 Converging lens 8 Light receiving part 13 Shift circuit 14 CPU
DESCRIPTION OF SYMBOLS 15 Random number circuit 16 Adder 17 Remainder circuit 18 Embedded data generation circuit 19 SYNC detection part 20 Counter 30 Recording medium 32 Reproduction data processing part 33 Recording data processing part

Claims (6)

A playback device for playing back data consisting of a plurality of recording blocks from an optical recording medium,
Detecting means for detecting a reference timing of the recording medium;
Reproduction timing detection means for detecting the reproduction timing of the data for each recording block;
Timing difference detection means for detecting a difference between the reference timing and the reproduction timing;
Relative difference detection for detecting a relative difference between the difference between the reference timing and the reproduction timing of the first recording block in the data and the difference between the reference timing and the reproduction timing of the second and subsequent recording blocks in the data Means,
A reproduction apparatus comprising: reproduction means for reproducing embedded data embedded in a linking area in the recording block at the time of recording the data, using the relative difference detected by the relative difference detection means. A recording apparatus for recording data consisting of a plurality of recording blocks on an optical recording medium,
Detecting means for detecting a reference timing of the recording medium;
Generating means for generating embedded data to be embedded in the second and subsequent recording blocks in the data;
Determining means for determining a shift amount from the reference timing for the plurality of recording blocks;
Recording means for shifting the shift amount determined by the determining means with respect to the reference timing and recording the data on the recording medium for each of the plurality of recording blocks;
The determining means determines a shift amount of the second and subsequent recording blocks according to the embedded data,
The recording apparatus, wherein the recording means embeds the embedded data in a linking area in the recording block. Random number generating means for generating a random number of the same value for the plurality of recording blocks;
The determination means determines a shift amount according to the random number for the first recording block in the data, and determines a shift amount according to the random number and the embedded data for the second and subsequent recording blocks in the data. The recording apparatus according to claim 2, wherein the recording apparatus is determined. Adding means for adding the random number and the embedded data;
The recording apparatus according to claim 2, wherein the determining unit determines a shift amount according to an output value from the adding unit. A reproduction method for reproducing data composed of a plurality of recording blocks from an optical recording medium,
A detecting step for detecting a reference timing of the recording medium;
A reproduction timing detection step for detecting the reproduction timing of the data for each recording block;
A timing difference detection step for detecting a difference between the reference timing and the reproduction timing;
Relative difference detection for detecting a relative difference between the difference between the reference timing and the reproduction timing of the first recording block in the data and the difference between the reference timing and the reproduction timing of the second and subsequent recording blocks in the data Steps,
And a reproduction step of reproducing embedded data embedded in a linking area in the recording block at the time of recording the data using the relative difference detected by the relative difference detection step. A recording method for recording data consisting of a plurality of recording blocks on an optical recording medium,
A detecting step for detecting a reference timing of the recording medium;
A generation step of generating embedded data to be embedded in the second and subsequent recording blocks in the data;
A determination step of determining a shift amount from the reference timing for the plurality of recording blocks;
A recording step of shifting the shift amount determined by the determination step with respect to the reference timing and recording the data on the recording medium for each of the plurality of recording blocks;
The determining step determines a shift amount of the second and subsequent recording blocks according to the embedded data,
The recording method, wherein the recording step embeds the embedded data in a linking area in the recording block.

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