JP2009015896A - Device and method for recording/reproducing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and a method for recording/reproducing, capable of surely reading data of a reading target immediately after an unrecorded part. <P>SOLUTION: A reading processing part 106a determines whether data of a reading target is readable from an optical disk 102, and outputs the data to a reproduction processing part 110 if the data is determined to be readable. If the data of the reading target is determined to be unreadable, an unrecorded part detection part 106b detects information regarding an unrecorded part immediately before the data of the reading target from the optical disk 102. An own-recorded-data determination part 106c determines the head position of own recorded data based on information regarding the unrecorded part, and instructs a writing control unit 108 to write the own recorded data from the head position. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical disc recording / reproducing apparatus and recording / reproducing method.

  In general, when an unrecorded area exists on an optical disc, it may be difficult to perform a stable reading operation. One reason for this is that an RF signal is not detected in an unrecorded area and it is difficult to achieve synchronization.

For this reason, various techniques for reliably reading data recorded on an optical disc have been proposed. For example, there is a method in which a dummy data recording step of recording dummy data as RUN-IN (run-in) between each fragment is provided, and the fragments are connected by a RUN-IN recording area (see, for example, Patent Document 1). According to this method, the fragments are always connected by the RUN-IN recording area.
JP 2003-228919 A

  However, the recording characteristics of data recorded on the optical disc may deteriorate after recording. For example, when dirt is attached to the surface of the optical disk or when it is scratched, the recording characteristics can be deteriorated. Also, depending on the performance of the drive used to record data on the optical disc, good recording characteristics may not be obtained at the beginning of the recorded portion due to insufficient recording power. Therefore, when the data to be read exists in a recorded portion immediately after the unrecorded portion, it may be difficult to read the data.

  Accordingly, an object of the present invention is to provide a recording / reproducing apparatus and a recording / reproducing method that can more reliably read data to be read immediately after an unrecorded portion.

  In order to solve the above-described problem, according to one aspect of the present invention, a recording / reproducing apparatus capable of recording data on a rewritable optical disc and reproducing data from the optical disc, the optical disc being driven An optical disc drive, a write control unit for controlling writing of data to the optical disc driven by the optical disc drive, and reading of the data from the optical disc driven by the optical disc drive, and outputting the data A read control unit, and a reproduction processing unit that reproduces the data output from the read control unit, wherein the read control unit determines whether the data to be read can be read from the optical disc, and the read target If it is determined that the data can be read from the optical disc, A read processing unit that outputs data to be read to the reproduction processing unit, and information regarding an unrecorded portion immediately before the data to be read when the data to be read cannot be read from the optical disc. Based on the information related to the unrecorded portion and the unrecorded portion detection unit that detects and outputs from the head, the head position of the self-recorded data is determined, and the write control from the head position of the self-recorded data And a self-recording data determining unit for outputting to the recording unit.

  According to another aspect of the present invention, there is provided a recording / reproducing method for recording data on a rewritable optical disc and reproducing data from the optical disc, wherein whether or not the data to be read can be read from the optical disc. Determining whether the data to be read can be read from the optical disc, reproducing the data to be read, and determining that the data to be read cannot be read from the optical disc. Detecting from the optical disc information relating to the unrecorded portion immediately before the data to be read; determining a leading position of the self-recorded data based on the information relating to the unrecorded portion; And writing the self-recording data. Raw method is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the recording / reproducing apparatus and recording / reproducing method which can read more reliably the data of the reading object immediately after an unrecorded part can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, a recording format for an optical disc will be described with reference to FIGS. In the HD DVD-RW standard, two types of recording methods, a continuous recording method and a random recording method, are employed. FIG. 1 is a schematic diagram for explaining a continuous recording mode. FIG. 2 is a schematic diagram for explaining a random recording mode.

  As shown in FIG. 1, in the continuous recording method, data is sequentially recorded from the beginning of the data area. FIG. 1 shows a state in which file data A is sequentially recorded from the beginning (left side of FIG. 1) of the data area of the optical disc. The continuous recording method can be employed, for example, when recording long-time continuous data such as video data.

  On the other hand, as shown in FIG. 2, in the random recording method, data is randomly recorded in the data area. More specifically, data can be recorded in any order in any location in the data area. As a result, in the random recording method, an unrecorded part exists between the recorded part and the recorded part. The random recording method can be adopted, for example, when a small amount of data is frequently recorded. Therefore, the random recording method can be employed when data is recorded using a personal computer.

  FIG. 2 shows a state in which file data B, file data C, and file data D are randomly recorded in the data area of the optical disc. An unrecorded portion X exists between the file data B and the file data C, and an unrecorded portion Y exists between the file data C and the file data D.

  Next, a recording / reproducing apparatus according to an embodiment of the present invention will be described with reference to FIG.

  FIG. 3 is a block diagram schematically showing the configuration of the recording / reproducing apparatus 100 according to an embodiment of the present invention. The recording / reproducing apparatus 100 is realized as an HD DVD player capable of performing a reproducing operation and a recording operation on a storage medium such as an HD DVD (high-definition digital versatile disc).

  The recording / reproducing apparatus 100 includes an optical disc drive (ODD) 104 that drives an optical disc 102 such as an HD DVD, a read control unit 106, a write control unit 108, a reproduction processing unit 110, a tuner 112, an antenna 114, an AV output terminal 116, and the like.

  The optical disc drive 104 is a drive unit for driving various optical discs such as HD DVD-ROM, HD DVD-R, HD DVD-RW, and HD DVD-RAM.

  The read control unit 106 accesses the optical disc drive 102 and reads data stored on the optical disc 102. Data read by the read control unit 106 is output to the reproduction processing unit 110. Further, the reading control unit 106 includes a reading processing unit 106a, an unrecorded part detecting unit 106b, and a self-recording data determining unit 106c.

  The read processing unit 106 a reads data to be read (hereinafter referred to as “target data”) requested from the host from the optical disc 102 via the optical disc drive 104. At this time, the reading processing unit 106a determines whether or not the target data can be read from the optical disc 102 (whether or not the target data can be searched). For example, when the intensity of the RF signal obtained from the head portion of the target data is greater than or equal to a predetermined threshold, it is determined that the target data can be read (searchable), and the intensity of the RF signal is less than the predetermined threshold It may be determined that the target data cannot be read (search is impossible).

  More specifically, the reading processing unit 106a searches for target data, and when the search is successful, reads the target data. On the other hand, when the search for the target data has failed, the reading processing unit 106a instructs the unrecorded portion detection unit 106b to detect the unrecorded portion located immediately before the target data. For example, when the target data is the file data D in FIG. 2, the reading processing unit 106a searches the file data D, and when the search is successful, reads the file data D. On the other hand, when the file data D cannot be searched, the reading processing unit 106a instructs the unrecorded portion detection unit 106b to detect the unrecorded portion Y located immediately before the file data D.

  The unrecorded portion detection unit 106b detects an unrecorded portion located immediately before the target data in response to an instruction from the reading processing unit 106a. More specifically, the unrecorded part detection unit 106b refers to the management information (bitmap) stored in the optical disc 102 and refers to the start position (for example, the start address) of the target data, in other words, the unrecorded part. The end position (for example, end address) of the part is detected. The detected information is output from the unrecorded part detection unit 106b to the self-recorded data determination unit 106c as information on the unrecorded part. In the bitmap, for example, the recording start position (start address) and data length (file length) of each data recorded on the optical disc 102 (for example, each of the file data B, C, and D shown in FIG. 2) are stored. ing. Note that information indicating whether each sector (or a predetermined recording unit) of the optical disk 102 has been recorded may be stored in the bitmap. For example, “1” may be stored if a certain sector has been recorded, and “0” may be stored if the sector has not been recorded.

  The self-recording data determining unit 106c determines a position where writing of the self-recording data is started, for example, a head address of the self-recording data. In the present specification, the “self-recorded data” refers to data that the recording / reproducing apparatus 100 writes to a non-recorded portion located immediately before the target data so that the target data can be read. An arbitrary size can be set in advance as the size of the self-recording data. For example, when the optical disk 102 is an HD DVD medium, the size of the self-recording data can be set to 1 ECC (Error Correction Code) block, that is, 32 sectors. In HD DVD media, one ECC block is the minimum writing unit and reading unit. Therefore, by setting the size of the self-recording data to one ECC block, the size of the self-recording data can be suppressed to the minimum value. Further, the processing load required for writing the self-recorded data can be minimized. The head position of the self-recorded data is determined based on the information output from the unrecorded part detection unit 106b. More specifically, the end address of the self-recorded data is determined to be the address output from the unrecorded part detection unit 106b. The start position (start address) of the self-recording data is determined to be a position (address) obtained by subtracting the size of the self-recording data from the end position (end address).

  The write control unit 108 accesses the optical disc drive 104 and writes data to the optical disc 102. For example, the write control unit 108 can receive a terrestrial digital broadcast wave by the tuner 112 via the antenna 114 and write data extracted from the received broadcast wave to the optical disc 102. Further, the writing control unit 108 can write the self-recording data on the optical disc 102 based on the information output from the self-recording data determining unit 106 c of the reading control unit 106.

  Information relating to the self-recorded data (for example, the head address, the data length, etc.) is temporarily stored in, for example, a memory provided in the recording / reproducing apparatus 100 without being directly written on the optical disc 102. By adopting such a configuration, when a reading operation or a writing operation is performed on the optical disc 102 by a device other than the recording / reproducing device 100, a portion where the self-recorded data is recorded can be handled as an unrecorded portion. The portion where the self-recorded data is recorded can be overwritten. In other words, it is possible to prevent inconvenience that the data recording is hindered because the self-recorded data is written in the unrecorded portion although it is actually an unrecorded portion.

  The reproduction processing unit 110 separates the data output from the reading control unit 106 into video data and audio data. The reproduction processing unit 110 decodes video data, audio data, and the like, performs blending processing and the like as appropriate, and then outputs them to a television receiver or the like connected to the recording / reproducing apparatus 100 via the AV output terminal 116. . The AV output terminal 116 may be, for example, an HDMI output terminal, a D1 / D2 / D3 / D4 video output terminal, or the like.

  Note that the arrows in FIG. 3 represent only a representative signal, information, or data flow between elements constituting the recording / reproducing apparatus 100, and do not represent the entire flow of the signal or the like.

  Next, with reference to FIGS. 4A and 4B, the self-recorded data writing operation performed by the read control unit 106 of the recording / reproducing apparatus 100 will be described in more detail. FIG. 4A is a schematic diagram showing a state in which the recording characteristics of the head portion of the file data D shown in FIG. 2 have deteriorated. In FIG. 4A, a portion surrounded by a dotted line Z is a portion where the recording characteristics are deteriorated. FIG. 4B is a schematic diagram for explaining self-recorded data written in a location immediately before the file data D. Hereinafter, for convenience of explanation, it is assumed that the target data is file data D.

  The read processing unit 106 a of the read control unit 106 determines whether or not the file data D that is target data can be searched via the optical disc drive 104. Here, as shown in FIG. 4A, the recording characteristics of the head portion of the file data D are deteriorated. For this reason, the reading processing unit 106a cannot search the file data D, and the unrecorded portion detection unit 106b detects the unrecorded portion that is located immediately before the file data D, that is, the unrecorded portion Y. Give instructions to do.

The unrecorded portion detection unit 106b refers to the management information (bitmap) stored in the optical disc 102 in response to an instruction from the read processing unit 106a, and stores the unrecorded portion detection unit 106b immediately before the file data D shown in FIG. 4B. The end address (Y _END ) of the recording area Y is detected. The detected end address (Y _END ) is output from the unrecorded portion detection unit 106b to the self-recording data determination unit 106c.

The self-recording data determination unit 106c determines the size and position of the self-recording data based on the end address (Y _END ) output from the unrecorded part detection unit 106b. Here, it is assumed that the size of the self-recording data is determined as 1 ECC block (for example, 32 sectors). The end address (S _END ) of the self-recorded data is determined as the end address (Y _END ) output from the unrecorded part detection unit 106b. That is, S _END = Y _END . The start address (S _START ) of the self-recording data is determined to be an address obtained by subtracting the size of the self-recording data (here, 32 sectors) from the end address (S _END ) of the self-recording data. It is assumed that the size of the self-recorded data does not exceed the size of the unrecorded portion Y. In other words, it is assumed that the relationship of Y _START ≦ S _START is satisfied. This is because if the size of the self-recorded data is larger than the unrecorded portion Y, the data of the file data C located immediately before the unrecorded portion Y is overwritten, and the recorded data is lost. Information regarding the size and position of the self-recording data is output from the self-recording data determination unit 106c to the write control unit 108.

The writing control unit 108 writes the self-recording data on the optical disc 102 based on the information output from the self-recording data determination unit 106c. As a result, the self-recorded data is written in the unrecorded part immediately before the file data D which is the target data, more specifically, the part from the address S _START to S _END .

  After the self-recording data is written on the optical disc 102 by the writing control unit 108, the self-recording data is searched by the reading processing unit 106a of the reading control unit 106. By searching and reading the self-recording data, a good RF signal can be detected and synchronized, so that the file data D following the self-recording data can be read more reliably. At this time, the self-recorded data is read in addition to the file data D which is the target data, but as described above, the head position and the data length of the self-recorded data are known. Therefore, the reading processing unit 106a may output data obtained by removing the portion corresponding to the self-recording data from the entire data (self-recording data + target data) read by searching the self-recording data to the reproduction processing unit 110. .

  As described above, according to the recording / reproducing apparatus 100 according to the embodiment of the present invention, when the recording characteristic of the head portion of the target data is deteriorated, the self-recorded data is stored in the unrecorded portion immediately before the target data. Written. Therefore, the target data can be read more reliably by detecting a good RF signal from the self-recorded data and establishing synchronization. Further, since the timing at which the self-recorded data is written is when the target data is read, the target data read performance can be improved even when the recording characteristics of the target data are deteriorated after the target data is recorded.

  Even if the self-recorded data is written immediately before the target data, the data originally recorded in the portion where the recording characteristics have deteriorated cannot be read accurately. However, by writing the self-recorded data immediately before the target data, it is possible to prevent a read error from occurring at the time of reading the target data, and to read data following the portion where the recording characteristics are deteriorated.

  A recording / reproducing method according to an embodiment of the present invention will be described with reference to FIG. FIG. 5 is a flowchart for explaining a recording / reproducing method according to an embodiment of the present invention. This recording / reproducing method can be applied to, for example, the recording / reproducing apparatus 100 shown in FIG. Hereinafter, for convenience of explanation, a case where the recording / reproducing method shown in FIG. 5 is applied to the recording / reproducing apparatus 100 will be described as an example.

  First, the reading control unit 106 of the recording / reproducing apparatus 100 receives a request for target data from the host (step S502). In response to the request from the host, the reading processing unit 106a of the reading control unit 106 searches the optical disc 102 for target data via the optical disc drive 104 (step S504). Next, the reading processing unit 106a determines whether or not the search for the target data has succeeded (step S506).

  If the target data search is successful (YES in step S506), the reading processing unit 106a reads the target data from the optical disk 102 via the optical disk drive 104 (step S508), and the process ends.

  On the other hand, if the search for the target data has failed (NO in step S506), the reading processing unit 106a instructs the unrecorded portion detection unit 106b to detect the unrecorded portion located at the location immediately before the target data. (Step S510).

  The unrecorded part detection unit 106b detects an unrecorded part located immediately before the target data in response to an instruction from the reading processing unit 106a (step S510). More specifically, the unrecorded part detection unit 106b refers to management information (bitmap) stored in the optical disc 102 and detects information (for example, the start address of target data) regarding the unrecorded part. This information is output from the unrecorded portion detection unit 106b to the self-recording data determination unit 106c.

  As described above with reference to FIGS. 4A and 4B, the self-recording data determination unit 106c determines the start address of the self-recording data based on the information output from the unrecorded part detection unit 106b, and the self-recording data The information regarding the size and position of the file is output to the write control unit 108 (step S512).

  Based on the information output from the self-recording data determination unit 106c, the writing control unit 108 writes the self-recording data in the unrecorded part immediately before the target data (step S514).

  After the self-recording data is written, the reading processing unit 106a searches the self-recording data (Step S516), uses the RF signal detected from the self-recording data, synchronizes, and reads the target data (Step S508). The process ends.

  According to the recording / reproducing method according to the embodiment of the present invention described above, the self-recorded data is written in the unrecorded portion immediately before the target data when the recording characteristic of the head portion of the target data is deteriorated. Therefore, the target data can be read more reliably by detecting a good RF signal from the self-recorded data and establishing synchronization. In addition, since the timing at which the self-recorded data is written is when the target data is read, the target data reading performance can be improved even when the recording characteristics deteriorate after the target data is recorded.

  Even if the self-recorded data is written immediately before the target data, the data originally recorded in the portion where the recording characteristics have deteriorated cannot be read accurately. However, by writing the self-recorded data immediately before the target data, it is possible to prevent a read error from occurring at the time of reading the target data, and to read data following the portion where the recording characteristics are deteriorated.

  In addition, this invention is not limited to the said embodiment as it is. In the implementation stage, the present invention can be embodied by changing the components without departing from the scope of the invention.

  Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

It is the schematic for demonstrating a continuous recording system. It is the schematic for demonstrating a random recording system. 1 is a block diagram schematically showing a configuration of a recording / reproducing apparatus according to an embodiment of the present invention. It is the schematic which shows the state in which the recording characteristic of the head part of file data deteriorated. It is the schematic for demonstrating the self-recording data written immediately before file data. It is a flowchart for demonstrating the recording / reproducing method which concerns on one Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... Recording / reproducing apparatus, 102 ... Optical disk, 104 ... Optical disk drive (ODD), 106 ... Reading control part, 106a ... Reading process part, 106b ... Unrecorded part detection part, 106c ... Self-recording data determination part, 108 ... Write control 110, reproduction processing unit, 112, tuner, 114, antenna, 116, AV output terminal.

Claims (5)

A recording / reproducing apparatus capable of recording data on a rewritable optical disc and reproducing data from the optical disc,
An optical disk drive for driving the optical disk;
A write controller for controlling the writing of data to the optical disk driven by the optical disk drive;
A reading control unit that controls reading of the data from the optical disc driven by the optical disc drive and outputs the data; and a reproduction processing unit that reproduces the data output from the reading control unit,
The read control unit
Determining whether or not the data to be read can be read from the optical disc, and if it is determined that the data to be read can be read from the optical disc, a read processing unit that outputs the data to be read to the reproduction processing unit;
When it is determined that the data to be read cannot be read from the optical disc, information relating to the unrecorded portion immediately before the data to be read is detected from the optical disc and output,
A self-recording data determining unit that determines a leading position of the self-recording data based on the information related to the unrecorded portion and outputs a writing instruction from the leading position of the self-recording data to the writing control unit; A recording / reproducing apparatus.   The recording / reproducing apparatus according to claim 1, wherein the information related to the unrecorded portion output by the unrecorded portion detection unit is a head address of the data to be read.   The recording / reproducing apparatus according to claim 1, wherein the size of the self-recording data is one ECC block. A recording / reproducing method for recording data on a rewritable optical disc and reproducing data from the optical disc,
Determining whether data to be read can be read from the optical disc;
When it is determined that the data to be read can be read from the optical disc, the step of reproducing the data to be read;
If it is determined that the data to be read cannot be read from the optical disc, detecting information on the unrecorded portion immediately before the data to be read from the optical disc;
Determining the top position of the recorded data based on the information on the unrecorded portion;
And a step of writing the self-recorded data from the head position. The detecting step includes
5. The recording / reproducing method according to claim 4, further comprising a step of detecting a head address of the data to be read as the information regarding the unrecorded portion.

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