JP2005160060A - Data recording / reproducing control apparatus and data recording / reproducing control method - Google Patents

Abstract

When recording an image on a recording medium, the writing speed to the recording medium is limited. Therefore, it is time-consuming to ensure the reliability and record data exceeding the transfer capacity of the recording medium. Can not be recorded in real time.
Data recording is performed by determining whether or not to perform verification processing according to the content of data during recording from the configuration, type, attribute information, and the like of the recording data during data recording. It is possible to improve the reliability of recorded data while minimizing a decrease in transfer speed. Also, at the time of reading data, the management data of the data recorded on the recording medium is referred to, and the read data is inspected at the time of reading according to the contents of the data from the structure, type, attribute information, etc. of the data to be read. It is determined whether or not to perform the reading process.
[Selection] Figure 1

Description

  The present invention relates to information recording and information reproduction in the field of digital information.

  In recent years, in the recording of digital information, writable recording media such as a rewritable disc (for example, DVD-RAM), a re-recordable disc (for example, DVD-RW), and a recordable disc (for example, DVD-R) have been rapidly used. It is popular. When an image is recorded on a recording medium, the writing speed of the recording medium is limited, so that a large amount of data requires time for recording.

  In particular, when real-time writing is required, it is necessary to write data transferred in real time, but the amount of data that can be recorded per unit time is limited. From the relationship of the transfer speed of compressed data recorded at such a transfer speed (write speed) of the recording medium, it is desired to write compressed data with higher image quality to the recording medium with high reliability and at a high speed.

  Japanese Patent Laid-Open No. 11-110140 discloses a conventional data recording apparatus. In the conventional data recording device, when the data transfer capability of the recording medium is insufficient at the time of recording on the recording medium, the recording data is temporarily stored in an auxiliary storage device that is faster than the recording medium, and stored. When recording on the medium becomes possible, data is transferred from the auxiliary storage device to the storage device (see Patent Document 1).

The conventional technique will be described below with reference to FIG. FIG. 4 shows a configuration diagram of a conventional data recording apparatus. In FIG. 4, the recording state monitoring unit 44 monitors the recording state in the storage device 42. The recording management unit 41 determines whether or not the storage device 42 is currently executing the writing process using the monitoring result determined by the recording state monitoring unit 44 from the data transfer capability of the storage device 42 and the transfer amount of the recording data. In the case of medium, the recording data is temporarily stored in the auxiliary storage device 43.
Japanese Patent Laid-Open No. 11-110140

  However, when the auxiliary storage device is used as described above, when the data writing is necessary in real time, the auxiliary storage device is used in a large amount when the data transfer amount is larger than the writing speed of the recording medium. May be needed. Even after the data transfer is completed, the writing is not actually completed until the writing of the data stored in the auxiliary storage device to the storage device is completed, but after the data transfer is completed until the data is actually written to the storage device. There will be a delay.

  In order to increase the writing speed, there is a method in which verify processing (reading written data and comparing it with data before writing) is not performed during writing. In that case, since the reading process and the data comparison process after writing are not performed, the writing speed is improved, but the reliability of the writing data is lowered.

  In view of the above problems, the present invention obtains the structure, type and attribute of data received by the recording method for the recording medium, and in the case of data giving priority to the reliability of data at the time of writing according to the information, write verify processing In the case of giving priority to the data transfer speed at the time of writing, the main feature is that no write verify processing is performed.

  According to the present invention, when data is recorded on a recording medium, the importance of the data is determined based on the structure, type, and attribute information of the data to be recorded. By performing the verify process at the time of writing only the data portion that requires more reliability, it is possible to improve the reliability of the write data while minimizing a decrease in transfer speed at the time of writing.

  Also, at the time of reading data from the recording medium, the management data of the data recorded on the recording medium is referred to check whether the read data is inspected at the time of reading from the structure, type, attribute information, etc. of the data to be read By determining whether or not there is a read process, it is possible to improve the reliability of read data while minimizing a decrease in the data read transfer rate.

(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of a data recording apparatus according to Embodiment 1 of the present invention.

  In FIG. 1, 11 is a data receiving means for receiving data including at least one of video, audio or text information, and 12 is a data importance by checking the structure, type and attribute of the data received by the data receiving means 11. A data determination means for determining the data, 13 is a data recording control means for determining the recording method of the data received by the data reception means 11 according to the importance of the data determined by the data determination means 12, and 14 is the data Data recording means for recording the data received by the receiving means 11, 15 a data storage means for saving the data recorded by the data recording means 14, and 16 a temporary data storage for temporarily storing the data recorded by the data recording means 14 Means 17 is a data reading means for reading the data recorded in the data storage means 15, 8 compares the data before storage recorded in the data temporary storage means 16 with the data recorded in the data storage means 15 read by the data reading means 17 to determine whether re-recording is necessary. Data comparison means.

  FIG. 2 explains the operation of the data determination means 12 in Embodiment 1 of the present invention. The operation of the data recording apparatus and data determination method 12 of the first embodiment configured as described above will be described with reference to FIGS.

  The data receiving means 11 receives data including at least one of video, audio and text information. The data received by the data receiving means 11 is checked by the data judging means 12 for information such as the data structure, type and attribute, and it is determined whether the received data is an important part of the corresponding data. Done. Then, according to the importance determined by the 12 data determining means, the 13 data recording control means controls the recording medium, that is, the recording method for recording the received data on the data storage means. The data recording unit 14 records and stores the received data in the data storage unit 15. If the data received at that time is determined by the data determining means 12 to be highly important data, or data that needs to be improved in reliability during recording, the data recording control means 13 is connected to the data recording means 14. The recording data is temporarily stored in the data temporary storage unit 16. After data recording and storage in the data storage unit 15 and the data temporary storage unit 16, the data reading unit 17 reads the data from the data storage unit 15 and the data comparison unit 18 stores the data stored in the data temporary storage unit 16. The previous data content and the data content after recording in the data storage means 15 are compared to determine whether the data has been correctly recorded. If it is determined here that the data has not been correctly recorded, the data recording control unit 13 instructs the data recording unit 14 to perform re-recording.

  Here, the data that is determined to be highly important by the data determination unit 12 and needs to have high recording reliability is, for example, a still image that has a longer display time per data amount than a moving image. That is. A moving image has a predetermined display time per frame of data. For example, even if the reliability of one frame data is low at the time of recording, it is a moving image and is immediately updated with data of the next frame. Fits only by the display time of the frame. However, in the case of a still image, the display time of one frame can be arbitrarily set and is set to be at least longer than the display time of one frame of moving image. If there is, the display time is longer than that of the moving image and the influence is great.

  In addition to this, the following cases may be considered as highly important data, that is, data that needs to be improved in writing reliability. When the received data is a compressed image, it is frame data serving as a reference. This is because if there is a defect in the reference frame data, all the frame data configured as a difference from the reference frame data is affected.

  In addition, when the header information in the data or the data to be received is MPEG data, the management information in the pack configuration includes operation instructions for the displayed video, defines the positional relationship of the preceding and following data, Since it affects the contents, it can be determined that the data is highly important and needs to be improved in reliability. Furthermore, data such as sub-picture information that has a relatively long display time can also be determined as data that is highly important and needs to be improved in reliability.

  It is obvious to those skilled in the art that the determination criteria of the data determination method are not limited to the determination criteria described above, but can be determined according to the spirit of the present invention and various developments can be made.

  Next, the operation of the 12 data determination means will be described in more detail with reference to FIG. In FIG. 2, 21 and 23 are moving image data, and 22 is still image data. When recording such data, reference is made to the configuration information of the data. When recording the moving image data 21 and 23, the verification process at the time of recording is not performed, but when recording 22 still images. Performs a verify process.

  The moving image data 21 and 23 are, for example, MPEG data, and the still image data 22 is, for example, I-Picture data or JPEG data of MPEG data.

  Further, when the data to be recorded is MPEG data, the contents of the picture structure of the MPEG data as shown in FIG. 2B are determined, and 24 and 27 are intra-coded pictures (I-Pictures), 25 in the MPEG data. , 26 and 28 are bidirectionally predictive-coded pictures (B-Pictures), I-Pictures of 24 and 27 are recorded with recording verification, and recording verification is not performed for other pictures. Like that.

  By performing the above determination, only the still image, which is data with a long display time of the recorded data, or the I-Picture data which is a reference in the case of frame correlation data such as MPEG, is recorded for verification. It is possible to improve the reliability of recorded data while minimizing a decrease in transfer speed.

(Embodiment 2)
The second embodiment of the present invention will be described below with reference to FIG. FIG. 3 is a block diagram showing the configuration of the data reproducing apparatus according to Embodiment 2 of the present invention. In FIG. 3, 15 is data storing means for storing data including at least one of video, audio or character information and management data of those data, and 31 is data for reading data recorded in the data storing means 15. Read means 32, management data storage means for storing management data read by the data read means 31, and 33 data reproduction for determining a data read method based on the management data stored in the management data storage means 32 The control means 34 is a data reproduction verification processing means for judging whether the data read by the data reading means 31 is correct.

  Here, the management data handled by the management data storage means is, for example, IFO file data in which navigation data in the DVD standard is recorded.

  The operation of the data reproducing apparatus of the second embodiment configured as described above will be described with reference to FIG. The management data of the recorded data is read using the data reading unit 31 from the data storage unit 15 which stores data including at least one of video, audio or character information and the management data of those data. The read management data is stored and managed in the management data storage means 32. When data including at least one of video, audio, and text information is read from the data storage unit 15, according to the configuration, type, and attribute of the data to be read with reference to the management information of the data read from the management data storage unit 32. The data reproduction control means 33 determines the reading method. The data reproduction verify processing means 34 checks the read data using an error checksum or the like when the data read method is read data check, and gives a reread instruction if the read data is invalid.

  Here, the data determined to be inspected by the data reproduction control means 33 is, for example, a still image having a longer display time per data amount than a moving image. Since a moving image has a predetermined display time per frame of data, for example, even if the reliability of one frame data is low at the time of recording or reading, it is a moving image, so it is immediately updated with the data of the next frame. It falls within the influence of only the display time of one frame. However, in the case of a still image, the data amount of one frame is the same, but the display time can be arbitrarily set and is set to be at least longer than the display time of one moving image frame. If this happens, the display time becomes longer and the influence is great.

  In addition to this, the following cases may be considered as highly important data, that is, data that needs to be improved in reliability during reading. When the data to be read is a compressed image, it is frame data serving as a reference. This is because if there is a defect in the reference frame data, all the frame data configured as a difference from the reference frame data is affected.

  In addition, when the header information in the data or the data to be received is MPEG data, the management information in the pack configuration includes operation instructions for the displayed video, defines the positional relationship of the preceding and following data, Since the contents are affected, it can be determined that the data is highly important and needs to be improved in reliability. Furthermore, data such as sub-picture information that has a relatively long display time can also be determined as data that is highly important and needs to be improved in reliability. It is obvious to those skilled in the art that the determination criteria of the data determination method are not limited to the determination criteria described above, but can be determined according to the spirit of the present invention and various developments can be made.

  By making the above judgment, data is read and transferred because only the reference data in the case of frame correlation data such as MPEG is used as a still image that has long display time of recorded data. It is possible to improve the reliability of read data while minimizing the decrease in speed.

  The data recording device and the data reproducing device can be combined to form one data recording / reproducing device, which is connected to other devices such as digital cameras, digital camcorders and computers, for example. It is obvious to those skilled in the art that it is used.

  The data recording / reproducing method according to the present invention adjusts the transfer speed of data to be recorded in relation to the transfer speed of the data to be recorded and the transfer speed of the recording medium by inserting a step of judging the contents of the data into the data receiving portion. Can be applied to indispensable uses.

1 is a block diagram showing a configuration of a data recording apparatus according to Embodiment 1 of the present invention. Conceptual diagram for explaining the operation of the data judging means The block diagram which shows the structure of the data reproduction apparatus in Embodiment 2 of this invention. Block diagram showing the configuration of a conventional data recording apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Data reception means 12 Data determination means 13 Data recording control means 14 Data recording means 15 Data storage means 16 Data temporary storage means 17 Data reading means 18 Data comparison means

Claims (22)

A determination means for determining at least one of the data configuration, type, and attribute;
Recording means for recording the data in a storage means;
A record verifying means for performing a record verify process of the recorded data;
Recording control means for controlling the recording verifying means to perform a verifying process on at least a part of the data based on the determination result of the determining means;
A data recording apparatus comprising: The recording control means includes
The data recording apparatus according to claim 1, wherein the recording unit is controlled to re-record the at least a part of the data in the storage unit in accordance with a result of the verification process performed by the recording verification unit. The record verifying means includes:
Temporary storage means for storing the at least part of the data before recording in the storage means;
Comparing means for comparing the at least part of the data read from the storage means with the at least part of the data stored in the temporary storage means;
The data recording device according to claim 1, comprising: The data recording apparatus according to claim 1, wherein the recording control unit controls the verification processing to be performed on the at least part of the data when the at least part of the data affects another part of the data. When the at least part of the data is a still image, I-Picture (intra-coded picture) in MPEG data, or sub-picture information, the recording control unit performs a verify process on the at least part of the data. The data recording device according to claim 1, wherein the data recording device is controlled as follows. 5. The recording control unit according to claim 4, wherein when the at least part of the data is header information or management information in a pack structure of MPEG data, the recording control unit controls the at least part of the data to be verified. The data recording device described. A reading means for reading data recorded in the storage means;
Determination means for determining at least one of the configuration, type, and attribute of the read data;
Reproduction verifying means for verifying at least a part of data from the read data;
A reproduction control means for controlling the reproduction verifying means to perform a verifying process on the at least a part of the read data based on a determination result of the determining means;
A data reproducing apparatus comprising: The reproduction control means includes
8. The data reproducing apparatus according to claim 7, wherein the reading unit is controlled so as to re-read the at least a part of the data according to a result of the verify process performed by the reproduction verifying unit. 8. A data reproducing apparatus according to claim 7, wherein said reproduction verifying means includes means for inspecting said at least part of data using an error checksum. 8. The data reproduction apparatus according to claim 7, wherein the reproduction control unit controls the verification processing to be performed on the at least part of data when the at least part of data affects other parts of the data. When the at least part of the data is a still image, I-Picture (intra-coded picture) in MPEG data, or sub-picture information, the reproduction control unit performs a verify process on the at least part of the data. The data reproducing apparatus according to claim 7, wherein the data reproducing apparatus is controlled as follows. A data reproducing apparatus for reproducing data recorded in the storage means of the data recording apparatus according to claim 1,
Reading means for reading out the data recorded in the storage means;
Reproduction control means for determining reproduction verification processing for at least a part of the read data;
When the playback control means determines the playback verification process for the at least a part of the data, the playback verification means for performing the playback verification process of the at least a part of the data,
The data reproduction apparatus, wherein the reproduction control unit controls the reading unit to re-read the at least part of the data recorded in the storage unit according to a result of the reproduction verification process of the reproduction verification unit. 2. An apparatus including a data recording / reproducing apparatus, wherein the data recording / reproducing apparatus includes the data recording / reproducing apparatus according to claim 1. The data recording / reproducing apparatus further includes:
Reading means for reading out the data recorded in the storage means;
A reproduction verifying means for verifying at least a part of the data from the read data;
Replay control means for controlling the replay verifying means to perform verify processing on the at least part of the read data based on the determination result of the determining means;
The reproduction control means includes
14. The apparatus according to claim 13, wherein the reading unit is controlled to re-read the at least part of the data according to a result of the verify process performed by the reproduction verifying unit. The apparatus according to claim 13, wherein the apparatus is a digital camera, a digital camcorder, or a computer. A method of recording data,
A determination step of determining at least one of the data configuration, type and attribute;
A recording step of recording the data in a storage means;
A record verify step for verifying the recorded data;
A recording control step for controlling the verification processing in the recording verification step for at least a part of the data based on the determination result of the determination step;
A data recording method including: The recording control step includes
The data recording method according to claim 16, further comprising a step of re-recording the at least part of data in the storage unit according to a result of the verify process in the recording verify step. The recording verify step includes
A temporary storage step for storing the at least part of the data before recording in the storage means;
A comparison step of comparing the at least part of the data read from the storage unit with the at least part of the data stored in the temporary storage step;
The data recording method according to claim 16, comprising: 17. The recording control step according to claim 16, wherein the recording control step includes a step of controlling a verify process to be performed on the at least part of data when the at least part of data affects another part of the data. Data recording method. A method of reading data,
A reading step of reading data recorded in the storage means;
A determination step of determining at least one of the configuration, type, and attribute of the read data;
A reproduction verify step for verifying the read data;
Based on the determination result of the determination step, a reproduction control step for controlling to perform verification processing in the reproduction verification step on at least a part of the data;
A data reproduction method including: The reproduction control step includes
21. The data reproduction method according to claim 20, further comprising the step of re-reading at least a part of the data according to a result of the verify process in the reproduction verify step. 21. The data according to claim 20, wherein the reproduction control step includes a step of controlling a verification process to be performed on the at least part of data when the at least part of data affects another part of the data. Playback method.

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