JP2006164395A - Data recording/reproducing device, data recording/reproducing method, program and computer readable recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a reproduction error of index information used for reproducing data to be recorded in a recording medium. <P>SOLUTION: A CPU 20 of an optical disk device 1 records video data in a data recording area of an optical disk 4 in a data recording process and repeatedly reproduces the recorded index information for preset frequencies by an index information repetition reproduction process whenever index information is recorded after the video data in an index information recording process. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention includes a CD-ROM disc, a CD-R disc, a CD-RW disc, a DVD-ROM disc, a DVD-R disc, a DVD-RW disc, a DVD-RAM disc, a DVD + RW disc, a DVD + R disc, a Blu-ray disc, Optical disc apparatus for recording and reproducing data on a recording medium such as an optical disc such as an HDDVD disc, a magneto-optical disc such as an MO or MD, a magnetic disc such as an HD or FD, a memory card such as a non-volatile RAM or a flash ROM The present invention relates to a data recording / reproducing apparatus, a data recording / reproducing method in the data recording / reproducing apparatus, a program to be executed by a computer, and a computer-readable recording medium on which the program is recorded.

  In recent years, data recording / reproducing apparatuses that digitally compress video data of various TV broadcasts and video data of old media such as VHS and record them on a recording medium such as a hard disk or an optical disk are becoming widespread. When video data such as movies and TV dramas is recorded on a recording medium by such a data recording / reproducing apparatus, it is generally recorded so that it is finally recognized as a file. On the other hand, a file system that controls file management, writing, and reading uses a standard such as Universal Disk Format (UDF).

In the data recording / reproducing apparatus as described above, during video data recording, “power failure during recording (including battery exhaustion)” “forced power-off due to accidental unplugging of the AC plug (such as battery removal) ) ”,“ Recording error occurred during recording (including vibration, failure, etc.) ”, etc., the recording operation was interrupted, recording media deteriorated due to scratches or dust attached, If a recording medium of inferior quality is used in nature, playback errors may occur frequently when the recorded data is played back, making it difficult to play back, or the recorded data may not be played back again.
Conventionally, there has been a data recording / reproducing apparatus that restores and reproduces data recorded when a reproduction error occurs (for example, see Patent Documents 1 to 4).
JP 2004-7075 A JP 2004-7684 A JP 2004-78490 A JP 2004-241104 A

However, in the conventional data recording / reproducing apparatus, if there is a problem such as interruption of the recording operation when recording the index information necessary when referring to the video data, the index information is recorded in a state where it cannot be normally reproduced. Thus, there has been a problem that the video data based on the index information cannot be reproduced or the recording medium itself cannot be reproduced.
The present invention has been made in view of the above points, and an object thereof is to prevent a reproduction error of index information used for reproducing data recorded on a recording medium.

In order to achieve the above object, the present invention provides the following data recording / reproducing apparatus (1) to (8).
(1) Data recording means for recording data in a recording area of a recording medium, index information recording means for recording index information of the data in the recording area, and each time index information is recorded by the index information recording means A data recording / reproducing apparatus comprising index information repetitive reproducing means for repeatedly reproducing recorded index information a preset number of times.

(2) In the data recording / reproducing apparatus of (1), means for changing the reproduction speed for each time when the index information is repeatedly reproduced for a predetermined number of times is provided in the index information repeated reproduction means. Data recording / reproducing device.
(3) In the data recording / reproducing apparatus of (1), the index information repetitive reproducing means sets the type of rotation method of the recording medium each time the index information is repeatedly reproduced a preset number of times. A data recording / reproducing apparatus provided with means for changing.
(4) In the data recording / reproducing apparatus according to (1), the index information repetitive reproducing means indicates the reproduction direction from the recording medium each time the index information is repeatedly reproduced a predetermined number of times. A data recording / reproducing apparatus provided with means for changing.

(5) In the data recording / reproducing apparatus according to any one of (1) to (4), the index information holding means for holding the index information recorded by the index information recording means and the reproduction by the index information repeated reproducing means. When a reproduction error occurs, index information is repeatedly recorded for a predetermined number of times, index information held by the index information holding means from the address next to the last successful recording in the recording area of the recording medium. A data recording / reproducing apparatus provided with a recording means.
(6) In the data recording / reproducing apparatus according to any one of (1) to (5), the index information recorded in the recording area of the recording medium is reproduced, and the recording medium is recorded based on the reproduced index information. Data reproducing means for reproducing data recorded in the recording area, and when the index information cannot be reproduced during the data reproduction by the data reproducing means, the latest index information that can be reproduced from the recording area of the recording medium is obtained. A data recording / reproducing apparatus provided with alternative index information reproducing means for reproducing as alternative index information.

(7) In the data recording / reproducing apparatus according to (6), the menu information is obtained by using reserve area securing means for securing a reserved area in the recording area of the recording medium, and alternative index information reproduced by the alternative index information reproducing means. Menu information creation means to be created and menu information created by the menu information creation means are recorded in the reserved area secured by the reserve area securing means, and the session is closed to the recording area of the recording medium for finalization. A data recording / reproducing apparatus provided with a finalizing means.
(8) In the data recording / reproducing apparatus of (1), dedicated area securing means for securing a dedicated area for recording a copy of the index information in the recording area of the recording medium, and recording of the recording medium by the index information recording means A data recording / reproducing apparatus provided with index information copy recording means for recording the index information of data in the area and then recording a copy of the index information in the dedicated area secured by the dedicated area securing means.

The following data recording / reproducing methods (9) to (16) are also provided.
(9) a data recording process for recording data in a recording area of a recording medium, an index information recording process for recording index information of the data in the recording area, and each time index information is recorded by the index information recording process A data recording / reproducing method comprising an index information repetitive reproduction step of repeatedly reproducing recorded index information a preset number of times.

(10) In the data recording / reproducing method of (9), the index information repeated reproduction step includes a step of changing the reproduction speed each time the index information is repeatedly reproduced a predetermined number of times. Data recording and playback method.
(11) In the data recording / reproducing method of (9), the type of rotation method of the recording medium is set for each time when the index information is repeatedly reproduced for a predetermined number of times in the index information repeated reproduction step. A data recording / reproducing method including a changing step.
(12) In the data recording / reproducing method of (9), in the index information repeated reproduction step, the reproduction direction from the recording medium is changed each time when the index information is repeatedly reproduced a preset number of times. A data recording / reproducing method including a changing step.

(13) In the data recording / reproducing method of any one of (9) to (12), the index information holding step for holding the index information recorded by the index information recording step, and the reproduction by the index information repeated reproduction step. When a reproduction error occurs, index information repetition for repeatedly recording the index information held in the index information holding step from the address next to the last successful recording address in the recording area of the recording medium a predetermined number of times. A data recording / reproducing method provided with a recording step.
(14) In the data recording / reproducing method of any one of (9) to (13), the index information recorded in the recording area of the recording medium is reproduced, and the recording medium is recorded based on the reproduced index information. A data reproduction process for reproducing data recorded in the recording area, and when the index information cannot be reproduced during data reproduction by the data reproduction process, the latest index information that can be reproduced from the recording area of the recording medium is obtained. A data recording / reproducing method including an alternative index information reproducing step of reproducing as alternative index information.

(15) In the data recording / reproducing method of (14), the menu information is obtained using the reserve area securing step for securing a reserved area in the recording area of the recording medium, and the substitute index information reproduced by the substitute index information reproducing step. The menu information creation process to be created and the menu information created by the menu information creation process are recorded in the reserved area secured by the reserve area securing process, and the session is closed to the recording area of the recording medium for finalization. A data recording / reproducing method including a finalizing step.
(16) In the data recording / reproducing method of (9), a dedicated area securing step for securing a dedicated area for recording a copy of the index information in the recording area of the recording medium, and recording on the recording medium by the index information recording step A data recording / reproducing method provided with an index information copy recording step of recording index information of data in an area and then recording a copy of the index information in a dedicated area secured by the dedicated area securing process.

Furthermore, the following programs (17) to (24) and a computer-readable recording medium (25) are provided.
(17) A data recording procedure for recording data in a recording area of a recording medium, an index information recording procedure for recording index information of the data in the recording area, and index information by the index information recording procedure. A program for executing an index information repeated reproduction procedure for repeatedly reproducing the recorded index information for a preset number of times.

(18) In the program of (17), the computer is caused to execute a procedure for changing the reproduction speed for each time when the index information is repeatedly reproduced for a preset number of times in the index information repeated reproduction procedure. Program for.
(19) In the program of (17), the recording medium rotation system type is set for each time when the index information is repeatedly reproduced by a predetermined number of times in the index information repeated reproduction procedure. A program for executing the procedure to change.
(20) In the program of (17), the reproduction direction from the recording medium is changed every time when the index information is repeatedly reproduced by a predetermined number of times in the index information repeated reproduction procedure. A program for executing the procedure to change.

(21) In any one of the programs (17) to (20), an index information holding procedure for holding index information recorded by the index information recording procedure in the computer, and reproduction by the index information repeated reproduction procedure. When a reproduction error occurs, index information repetition for repeatedly recording the index information held by the index information holding procedure from the address next to the last successful recording address in the recording area of the recording medium a predetermined number of times A program for executing the recording procedure.
(22) In the program according to any one of (17) to (21), the computer reproduces the index information recorded in the recording area of the recording medium, and records the recording medium based on the reproduced index information. A data reproduction procedure for reproducing data recorded in the recording area, and when the index information cannot be reproduced during data reproduction by the data reproduction procedure, the latest index information that can be reproduced from the recording area of the recording medium is obtained. A program for executing an alternative index information reproduction procedure for reproducing as alternative index information.

(23) In the program of (22), the menu information is stored in the computer using the reserve area securing procedure for securing the reserved area in the recording area of the recording medium and the substitute index information reproduced by the substitute index information playing procedure. The menu information creation procedure to be created and the menu information created by the menu information creation procedure are recorded in the reserved area secured by the reserve area securing procedure, and the session is closed to the recording area of the recording medium and finalized. A program for executing the finalization procedure to be performed.
(24) In the program of (17), a dedicated area securing procedure for securing a dedicated area for recording a copy of index information in the recording area of the recording medium in the computer, and recording on the recording medium by the index information recording procedure A program for executing an index information copy recording procedure for recording index information of data in an area and then recording a copy of the index information in a dedicated area secured by the dedicated area securing procedure.
(25) A computer-readable recording medium on which the program according to any one of (17) to (24) is recorded.

In the data recording / reproducing apparatus and the data recording / reproducing method according to the present invention, since it is confirmed that normal reproduction can be performed by performing a reproduction operation for confirming whether or not reproduction is possible after recording index information, it is recorded on a recording medium. It is possible to prevent an error in reproducing index information used for reproducing data.
The program according to the present invention can cause a computer to execute a function for preventing an error in reproducing index information used for reproducing data to be recorded on a recording medium.
Furthermore, the computer-readable recording medium according to the present invention can easily install a function for preventing a reproduction error of index information used for reproducing data to be recorded on the recording medium in the computer.

Hereinafter, the best mode for carrying out the present invention will be specifically described with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of a video recording system according to an embodiment of the present invention.
In this video recording system, an optical disk apparatus 1 that uses an optical disk as a recording medium that is a recording destination of video data and a host computer 2 are connected to an ATA / ATAPI interface, a SCSI interface, a USB interface, an IEEE 802 interface, an IEEE 1284 interface, an IEEE 1394 interface, a serial ( (Serial) Data is exchanged via an interface 3 such as an ATA interface.
The optical disc 4 is an optical disc such as a CD-R disc, a DVD-R disc, a DVD + R disc, a CD-RW disc, a DVD-RW disc, a DVD-RAM disc, a DVD + RW disc, a Blu-ray disc, an HDDVD disc, and the write-once type. It may be a rewritable recording medium that can be handled like a recording medium (write-once).

The optical disc apparatus 1 is equipped with a spindle motor (SPM) 10 that rotates the optical disc 4 and a light source that irradiates a laser beam L for recording or reproducing data on the optical disc 4, and performs minute operations on the optical disc 4. An optical pickup (PU) 11 that can be performed, a tracking motor 12 that moves the optical pickup 11 in the radial direction of the optical disk 4, and a tilt motor that can tilt the optical pickup 11 to cope with warpage and vibration of the optical disk 4. 14 is provided.
The signal processing unit 13 outputs various data such as video data and index information to be recorded on the optical disc 4 to the optical pickup 11, and stores various data such as video data and index information output from the optical pickup 11 in a buffer memory. The process etc. which memorize | store in 19 are performed.

The tilt control system unit 15 controls the drive of the tilt motor 14.
The rotation control system unit 16 controls rotation driving of the spindle motor 10.
The tracking control system unit 17 controls the driving of the tracking motor 12.
The optical pickup (PU) control system unit 18 controls driving of the optical pickup 11.
The buffer memory 19 is a memory that temporarily stores and stores various data such as video data and index information recorded on or reproduced from the optical disc 4.
The interface controller (I / F / C) 23 controls data exchange with the host computer 2 via the interface 3.

  The CPU 20, ROM 21 and RAM 22 constitute a microcomputer, and the ROM 21 stores a control program for controlling the entire optical disc apparatus 1 and a program for causing the computer to execute various procedures according to the present invention. By executing the control program and the program as an area, the entire control of data recording and reproduction of the optical disc apparatus 1 and the data recording / reproducing method according to various steps according to the present invention are executed. That is, the CPU 20 performs data recording means, index information recording means, index information repetitive reproducing means, index information holding means, index information repetitive recording means, data reproducing means, alternative index information reproducing means, and reserve area reservation according to the present invention. Each function of the means, menu information creating means, finalizing means, dedicated area securing means, index information copy recording means and the like is achieved.

On the other hand, the host computer 2 is a terminal device such as a personal computer, and the AV input / output system unit 30 is connected to a display unit such as a CRT or LCD and input / output devices such as various video / audio input devices, and video corresponding thereto. Controls data input / output (including AD / DA conversion).
The code multiplexing unit 31 compresses / decompresses or multiplexes / separates the video data signal into a predetermined digital format.
The interface controller (I / F / C) 32 controls data exchange with the optical disc apparatus 1 via the interface 3.
An operation system unit / real-time clock (RTC) 33 connects an operation display unit, inputs operation information from the user, and displays operation information for various operations on the display panel, and video data is recorded. Timekeeping processing used for functions such as reservation in time management, time display, etc. is performed.

The buffer memory 34 is a memory that temporarily stores and stores various data such as video data and index information that are sent to the optical disc apparatus 1 and recorded on the optical disc 4 or received from the optical disc apparatus 1. .
The CPU 35, the ROM 36, and the RAM 37 constitute a microcomputer, and a control program that controls the entire host computer 2 is stored in the ROM 36 (or a storage device that stores various programs such as a hard disk device (not shown)). However, by executing the control program using the RAM 37 as a work area, the entire data recording and reproduction control processing of the host computer 2 is executed. In order to install the program according to the present invention in the optical disc apparatus 1, the program may be written in the ROM 36 when the apparatus is manufactured, or the program is recorded on various computer-readable recording media such as an optical disc after the apparatus is shipped. You may make it introduce | store by memorize | storing in ROM36 via the recording medium (in this case ROM is a rewritable memory).

In this video recording system, video data is recorded on the optical disc 4 by sending video data input from the video / audio input device by the host computer 2 to the optical disc device 1 via the interface 3. Is stored in the buffer memory 19, is subjected to predetermined signal processing, is irradiated with laser light L from the optical pickup 11, and is recorded on the optical disk 4. At that time, index information necessary for reproducing the video data is also recorded.
On the other hand, reproduction of video data from the optical disk 4 is performed by reproducing video data based on the index information reproduced from the optical disk 4 and temporarily storing it in the buffer memory 19, and then transmitting it to the host computer 2 via the interface 3. The host computer 2 stores the video data received from the optical disc apparatus 1 in the buffer memory 34 and displays the video data on the display unit.

Next, a failure appearing on the optical disc 4 will be described.
If the central axis of the optical disc 4 is tilted due to the tilt of the center hole, a surface shake occurs during rotation, which causes a problem that data cannot be normally recorded / reproduced.
In addition, the recording surface of the recording area can be scratched by nails and unevenness, ink and printing splashes can become smudged, user fingerprints and skin oils, dust and dirt can adhere If this happens, the laser beam applied to the scratched part will be scattered, or sufficient light will not be applied to the recording surface, which may make it difficult to read data.
Furthermore, even if the surface of the disk is warped due to the wrinkle of the apparatus when the optical disk 4 is manufactured, a failure that makes it difficult to read data occurs. This does not occur only on the outer peripheral side, but may also occur on the inner peripheral side or the central portion, resulting in a wavy surface. A sticker or tape may be stuck on the label side, and the center of gravity and balance of the disc may be lost. Then, a stable rotation assumed in advance cannot be obtained, and noise is generated when it is severe.

As described above, there are various types of failures that occur in the optical disc 4, and when these failures are encountered during data recording, it takes a long time to record, causing a buffer overflow or stopping the recording operation. In this case, the unrecorded area naturally does not complete the recording block, and therefore, there is a high possibility that the entire recording block cannot be read. In particular, if the above-described failure occurs when recording index information necessary for reproducing video data, the recorded index information cannot be reproduced, and thus the already recorded video data cannot be reproduced.
Therefore, the optical disk apparatus 1 checks whether or not reproduction is possible by repeating reproduction a plurality of times each time index information is recorded on the optical disk 4.

FIG. 2 is an explanatory diagram showing a format when video data and index information are recorded on the optical disc 4.
The recording area of the optical disc 4 has a lead-in area 40 and a data recording area 41 from the inner circumference side where the center hole is located toward the outer circumference side. When the disc is finalized, the lead-out area is read out. Region 42 is provided. In the lead-in area 40, table of contents (TOC) 44, which is table of contents data, an address indicating the range of the reserved area, and the like are recorded.

  The data recording area 41 has a reserved area 43 of a predetermined range secured after the disc mount at the head on the inner circumference side. This reserved area 43 starts index information 46 of the video data 45 recorded in the data recording area 41. An address and an end address (or volume data indicating a start address and a recording range may be recorded) are recorded. The video data 45 is recorded after the reserved area 43, and when the recording of the video data 45 of one title is finished, the index information 46 used for reproducing the recorded video data 45 is recorded thereafter. The next video data 45 is added thereafter.

The index information 46 of the first video data 45 is recorded with the start address and end address (or the start address and volume data) of the first video data 45, and the index information 46 of the second video data 45 is 1 The start address and end address (or the start address and volume data) of each of the second and second video data 45 are recorded, and then the video data is recorded in order, and the index information of the last video data is All start addresses and end addresses (or start address and volume data may be recorded) of the video data recorded so far are recorded.
In this way, video data can be recorded up to the end of the data recording area 41 up to the limit obtained by subtracting the index information, and finally the index information is recorded.

Next, processing at the time of recording video data in the optical disc apparatus 1 will be described.
When a data recording command is sent from the host computer 2, the optical disc apparatus 1 records video data and index information used when reproducing the video data on the optical disc 4 in the following manner. Check whether the index information has been recorded repeatedly so that it can be played back.

FIG. 3 is a flowchart showing processing at the time of video data recording in the optical disc apparatus 1 shown in FIG.
This process is performed by the CPU 20 at the initial setting of step 1 (indicated by “S” in the figure) (the count value of the number of reproductions counted when the index information after recording on the optical disc is repeatedly reproduced: C1 = 1, The upper limit value of the preset number of repetitions for reproducing the index information recorded on the optical disc: M, the value of M can be arbitrarily set, for example, M = 5) is set (for example, in the RAM), and Step 2 When a blank disk optical disk on which no data is recorded is inserted into the optical disk apparatus, an optical disk mounting process is performed in step 3 (this mounting process is a known technique, and detailed description thereof is omitted. In this step, data is recorded. Including the OPC process for determining the optimum recording condition for the recording), and in step 4 the data in the recording area of the optical disc Ensuring the reserved area in a predetermined range on the inner circumferential side head of the recording area. At this time, address information indicating the range of the reserved area is recorded in the lead-in area.

  In step 5, it is determined whether or not video data has been received from the host computer, and it waits until it is received. If received, video data is recorded in the data recording area of the optical disc in step 6 (data recording process), and in step 7. Index information of the recorded video data is created and stored in the RAM. In step 8, the index information is read from the RAM and transferred to the buffer memory. In step 9, the index information is recorded after the recorded video data in the data area of the optical disk. Then, address information (start address and end address or start address and volume data) indicating the index recording position is recorded in the lead-in area (index information recording step).

In step 10, it is determined whether or not a recording error has occurred in which index information could not be recorded on the optical disc. The causes of the recording error include such things as out-of-track, out-of-focus, and inability to read the recording destination address in the data recording area.
If a recording error occurs in step 10, recording error processing such as notifying the recording error to the host computer is executed in step 16, and this processing is terminated.
If no recording error occurs in step 10, the buffer memory is cleared in step 11. Here, when reproducing index information, if nothing is reproduced immediately after recording the index information, the index information remaining in the buffer memory may be reproduced at high speed. Since there is a possibility that the data has not been reproduced, the actual reproduction is performed after the buffer is cleared. Further, instead of clearing the buffer, dummy reading such as once reading another part of the optical disk may be performed. In this way, it is possible to confirm whether recording is performed reliably.

In step 12, the recorded index information is reproduced from the data recording area of the optical disk. In step 13, it is determined whether or not a reproduction error that cannot be reproduced from the optical disk has occurred. The causes of the reproduction error include such things as out of track, out of focus, the address of the recording destination in the data recording area cannot be read, and error correction cannot be performed.
If it is determined in step 13 that a reproduction error has occurred, there is a high possibility that the index information has not been correctly recorded in step 17, so a reproduction error process for notifying the host computer to that effect is executed, and this process ends.

If no reproduction error occurs in step 13, it is determined in step 14 whether or not the count value C1 <M of the number of reproductions. If C1 <M, the count value is incremented by 1 in step 15 to set C1 = C1 + 1. Returning to FIG. 11, the same index information reproduction process as the buffer clear process and the process of determining whether or not a reproduction error has occurred are repeated. If C1 <M is not satisfied in step 14 (if the predetermined number of reproductions have been repeated) This process ends.
In this way, every time index information is recorded by the index information recording step, the index information repeated reproduction step of repeatedly reproducing the recorded index information a preset number of times is performed.

In the above processing, if C1 <M in step 14, the processing based on the instruction from the host computer may be continued without performing any processing, but the index information is correctly recorded in the host computer. You may make it notify the information which shows that it is carried out.
In this way, since it is confirmed whether or not reproduction is possible by repeatedly reproducing each time index information is recorded, the reliability of recording and reproduction on the optical disc can be improved.

Next, in the above-described processing, the reproduction speed may be changed every time when the index information is repeatedly reproduced a preset number of times.
In that case, a relatively slow playback speed is set at the time of the first playback, and playback is performed by gradually increasing the playback speed in the second and subsequent playbacks.
For example, in the first playback, playback is performed at 8 × speed, in the second playback, playback is performed by increasing the playback speed to 12 × speed after step 15, and in the third playback, playback is performed at 24 × speed in the same manner.
Alternatively, the type of rotation method of the optical disk 4 may be changed every time when index information is repeatedly reproduced a preset number of times.
For example, the CAV method is used for the first reproduction, and the rotation method is changed to the CLV method after step 15 in the second reproduction.

Alternatively, the reproduction direction from the optical disc 4 may be changed every time when the index information is repeatedly reproduced a preset number of times. For example, when reproducing the index information at addresses 10 to 20 in the data recording area, the information is first read from the address 10 and then reproduced in the opposite direction, such as from 20 to 10.
Alternatively, the following may be performed.
Each time index information is recorded from the host computer 2 to the optical disc apparatus 1, a different kind of reproduction instruction command is transmitted, and each time the CPU 20 of the optical disc apparatus 1 receives the reproduction instruction command, it is recorded on the optical disc 4. Repeated playback of the same index information.
In this way, when the index information is recorded and reproduced repeatedly a plurality of times, it is confirmed whether or not the reproduction is possible by changing the conditions at the time of reproduction at each time. It can be further increased.

Next, instead of the reproduction error processing in step 17 described above, the following reproduction error processing may be performed.
In this reproduction error process, when an index information reproduction error occurs, recording is repeatedly performed without simply causing a reproduction error. If a reproduction error is simply made, the index information may end without being recorded, and such an optical disc may become a medium that cannot be reproduced again because the index information is not found. . Therefore, an attempt is made to ensure recording by retrying the recording of the index information several times. At that time, the recording location may be changed, or the optical disk may be temporarily ejected and inserted again before recording. However, if it is repeated too many times, it is expected that it will take time, so the number of times of recording should be kept within a predetermined number.

FIG. 4 is a flowchart showing reproduction error processing when index information is repeatedly recorded.
In this process, when the CPU 20 determines that a reproduction error has occurred in the step 13, first, the index information holding step is executed to record the index information in which the reproduction error has occurred by recording on the optical disc 4 (or the buffer memory 19). ) Remember and hold.
Thereafter, in step (indicated by “S” in the figure) 21, it is determined whether or not an error that cannot be corrected has occurred. If an error that cannot be corrected occurs, the process returns to perform the same processing as described above.
If an error that cannot be corrected in step 21 does not occur, the initial value in step 22 (the count value of the number of times of recording counted when index information is repeatedly recorded on the optical disc: C2 = 1, the index information is recorded on the optical disc). An upper limit value of the number of repetitions set in advance: N, and the value of N can be arbitrarily set. For example, N = 3) is set (for example, in the RAM).

In step 23, the final recording address A1 of the index information (the end address of the index information recorded last on the optical disk) is confirmed. In step 24, the recording address A2 next to the final recording address A1 is set as the head position from the recording address A2. Index information is recorded. In step 25, it is determined whether or not the count value C2 <N of the number of times of recording. If C2 <N, the count value is incremented by 1 in step 27 to set C2 = C2 + 1, and the process returns to step 24 and the same. The index information recording process is repeated, and if C2 <N is not satisfied in step 25 (when the predetermined number of recordings has been repeatedly recorded), the process is terminated.
In this way, when a reproduction error occurs in the reproduction by the index information repeated reproduction process, the index information holding process starts from the address next to the last address of the index information that has been successfully recorded last in the recording area of the optical disc 4. An index information repetitive recording process for repeatedly storing the held index information a preset number of times is executed.

  Each time the above repetitive recording is executed, the recorded index information is replayed to check whether it can be replayed. When it is confirmed that replay is possible, the repetitive recording is terminated, and the preset number of times of recording is set. If the recording is not successful even after repeated recording, it is more preferable that error processing is performed to notify the host computer 2 that the index information has not been correctly recorded.

In this way, when a reproduction error occurs by performing reproduction a plurality of times for each index information recording, the index information is repeatedly recorded, which is important information for reproducing the video data recorded on the optical disc. Since it works for recording index information, the reliability of recording and reproduction with respect to the optical disc can be further improved.
When the above-described index information is repeatedly recorded, it becomes easier to record if the conditions such as the recording speed, recording method, and rotation speed are changed. For example, the recording speed and the rotation speed may be decreased.

Next, a description will be given of a process for reproducing an optical disc on which video data is recorded in the optical disc apparatus 1.
In the optical disc apparatus 1, when the optical disc 4 is reproduced, the CPU 20 executes a data reproduction step to reproduce the index information recorded in the data recording area of the optical disc 4, and records in the data recording area based on the reproduced index information. The reproduced video data is reproduced and transmitted to the host computer 2.
During the reproduction, when certain index information cannot be reproduced, or when the index information cannot be found at a predetermined location, the video data is reproduced by searching for and referring to other reproducible index information. Therefore, contents other than video data for which index information cannot be read can be reproduced.

FIG. 5 is a flowchart showing processing when the index information at the time of reproducing the optical disk on which the video data is recorded in the optical disk apparatus 1 shown in FIG. 1 cannot be reproduced.
In this process, when the CPU 20 cannot reproduce the index information at the time of reproduction of the optical disk 4, the data recording area of the optical disk is searched in step (indicated by “S” in the figure) 31, and the data recording area is finally stored in step 32. It is determined whether or not there is index information after the video data recorded in step S33. If there is index information, the index information is reproduced in step 33. In step 34, it is determined whether or not it can be reproduced. The index information after the last video data is reproduced, and the host computer is notified as alternative index information in step 40, and this processing is terminated.

If it is determined in step 32 that there is no index information after the last video data recorded in the data recording area, the optical disk is searched again in step 35, and immediately before the video data last recorded in the data recording area in step 36. It is determined whether or not there is index information. If so, the index information is reproduced in step 37, and it is determined whether or not it can be reproduced in step 38. If it can be reproduced, step 39 immediately before the last video data is determined. The index information is reproduced and notified to the host computer as alternative index information in step 40, and this processing is terminated.
If there is no index information immediately before the last video data recorded in the data recording area in the determination in step 36, the reproduction error information is notified to the host computer in step 41, and this process is terminated.

  In this way, the index information recorded on the optical disc 4 is reproduced, and when the data reproduction step of reproducing the video data recorded on the optical disc 4 based on the reproduced index information is performed, the data by the data reproduction step When the index information cannot be reproduced during reproduction, the most recent index information that can be reproduced from the data recording area of the optical disc 4 is reproduced as alternative index information, thereby interrupting the processing. Therefore, it is possible to reproduce other than the video data from which the index information cannot be read.

If the recording is successful after recording the index information, the address of the recording position of the index information may be recorded. This may be stored at a fixed address, or may be put in a part of specific data, so it is not always necessary to record only at that timing.
Thus, if there is an address of index information that has been successfully recorded, if the index information has not been successfully recorded, it is possible to easily search for the latest reproducible index information that has been previously recorded.
If there is no index information address that has been successfully recorded, all the recording on the optical disk must be examined sequentially from the block behind the recording area as much as possible.

When the index information is found in this way, it is treated as the latest index information and used for reproducing the video data. If it cannot be found, it notifies the host computer that the index information could not be found.
In addition, since it takes a long time to read back from the last recorded address, if the address where the last recorded index information exists is recorded in advance at an appropriate interval, the index information can be reproduced using that address. .
Alternatively, the reproduction of the index information can be performed at a higher speed by taking a method such as internally holding in the optical disc apparatus 1.

  In this way, even when index information is not recorded or cannot be found at the time of reproduction, such as an optical disc that has failed to be additionally recorded, a deteriorated optical disc, etc., the latest index information recorded elsewhere is searched and reproduced. Therefore, there is a high possibility that video data can be reproduced continuously, and an optical disk device that actively expands the reproduction limit can be provided.

Next, when playing back an optical disc, when certain index information cannot be played back, the index information is virtually generated by simply considering up to the last recorded portion as one piece of video data (contents). The reproduction of video data may be started based on the above.
In this way, the index information and each content do not correspond one-to-one, but playback can be started for the time being.

FIG. 6 is a flowchart showing processing when index information is virtually generated and played back when index information is not found during playback of the optical disc.
In this process, the CPU 20 searches the index information designated from the data area of the optical disc in step (indicated by “S” in the figure) 51 and determines whether or not the search is successful in step 52. The process ends, and video data is reproduced based on the reproduced index information.
If the search for the index information specified in the determination in step 52 fails, the recording start address is reproduced in step 53, and it is determined in step 54 whether or not there is a reproduction error. If it is a reproduction error, there is a high possibility that the optical disk can no longer be mounted and the medium cannot be expected to be reproduced. Therefore, in step 58, a reproduction error notification is transmitted to inform the host computer that the index cannot be generated. This process ends.

If it is determined in step 54 that there is no playback error, the default parameter of recording that is normally preset is acquired from playback of the recording start address in step 55, the recording time is calculated from the recording start address and default parameter in step 56, and the index information is virtually Create it automatically. The index information includes information such as recording date and time, recording mode, recording source, recording title, reference frame, and content outline.
Then, in step 57, the created index information is given to the reproduction portion as alternative index information, thereby starting the reproduction of the video data and ending this process.

It should be noted that it can be understood that the index information created by the above processing is virtually created.
Thus, although not all reproduction can be actually performed, it is possible to give an opportunity to start reproduction, and it can be expected to partially save the video data.
In this way, even when index information is not recorded or cannot be found at the time of playback, such as an optical disc that has failed to be additionally recorded, a deteriorated optical disc, and the like, virtual index information is created and played back. Thus, there is a high possibility that the reproduction can be continued, and it is possible to provide an optical disc apparatus that actively expands the reproduction limit.

Next, the finalizing process in the optical disc apparatus 1 will be described.
By performing finalization processing on the optical disc 4 using the last index information or the generated index information, it is possible to make additional writing to the optical disc 4 impossible and to obtain a completed read-only medium.

FIG. 7 is an explanatory diagram for explaining the finalizing process in the optical disc apparatus 1 shown in FIG.
When the CPU 20 starts the finalizing process for the optical disc 4, if the last index information in the data recording area 41 is incorrect index information 47, as shown by the dotted line 49 in the figure, the alternative index information in the menu information creation process When the menu information (video data) is created using the alternative index information (the latest reproducible index information 48 recorded before the illegal index information 47) reproduced by the reproduction process, the created menu information is stored in the optical disc 4. In the reserve area securing process at the time of mounting, recording is performed in the reserve area 43 secured in the data recording area, the data recording area 41 is continued, and the TOC 44 and the like are recorded in the lead-in area 40, and the lead-out area 42 is recorded. To add no discontinuous unrecorded parts And so, to execute the finalizing step of performing finalization to close the session to the recording area of the optical disc. In this process, the virtually created index information may be used instead of the substitute index information.
In this way, the alternative index information can be actively used even during the finalizing process, and the reproduction possibility of the optical disc can be improved.

Next, it is preferable that the index information is recorded twice when video data is recorded in the optical disc apparatus 1.
FIG. 8 is an explanatory diagram for explaining the finalizing process in the optical disc apparatus 1 shown in FIG.
The CPU 20 includes a reserved area 43 in the data recording area 41 of the optical disk, and a video data recording area 50 for recording the video data and index information of the video data, by a dedicated area securing step, for example, when the optical disk is mounted in advance. A dedicated area for recording a copy of the index information is divided into an index information copy recording area 51 for securing a dedicated area for recording a copy of the index information, and a dedicated area for recording a copy of the index information is secured in the data recording area 41.
A reserved function of a known technique may be used to secure the dedicated area. In the reserve function, the size of a plurality of reserved areas other than the outermost area can be determined by setting a plurality of recordable addresses (Next Writable Address: NWA), for example, write-once recording A plurality of reserved areas can be set in the recording area of the medium.

Then, after the video data 52 and the index information 53 of the video data 52 are recorded in the video data recording area 50 of the optical disc by the index information recording process, the index information copy recording process shows the arrow 61 in FIG. Then, a copy 58 of the index information 53 is recorded in the index information copy recording area 51.
Similarly, a copy 59 of the index information 55 of the video data 54 and a copy 60 of the index information 57 of the video data 56 are recorded in the index information copy recording area 51, respectively.

In this way, at the time of recording video data on the optical disc 4, every time index information is recorded after the video data, a copy thereof is recorded in the index information copy recording area 51.
Therefore, each index information recorded in the video data recording area 50 can be backed up in the index information copy recording area 51, and even if the index information in either the video data recording area 50 or the index information copy recording area 51 is broken. Recovery can be made using the index information recorded in the other. Also, if the index information copy recording area 51 is provided on the outermost periphery of the optical disc, there is a copy of the index information collectively on the outermost periphery. Therefore, a copy corresponding quickly when the index information in the video data recording area 50 cannot be reproduced. You can find out.
In the finalizing process, index information at any point can be used.

In this way, the reserve function is actively used to duplicate and centralize the index. As a result, a high-speed search and a device with improved reliability can be obtained.
The index and its backup can be recorded in an area different from the area where video recording is performed.
By using this, when a regular index cannot be recorded / reproduced, it is recorded and reproduced from there.

It should be noted that a function unnecessary for recording is removed from the components of the optical disk device 1 described above, for example, a high laser power is unnecessary for recording, and a code processing system from which a compression function is removed or the like. If accuracy and performance are not required, a reproduction-only device having the above-described functions can be obtained.
In such a reproduction-only device, an optical disk without index information, an optical disk in which the last index information is broken, an optical disk in which normal finalization processing cannot be performed, an optical disk with index information in a different reserved area, and the like are reproduced. can do.

  According to the video recording system of this embodiment, the recording of the index information on the video data, the reproduction of the index information on the optical disc is prevented as much as possible, the recorded data on the deteriorated optical disc, the source of poor conditions It is possible to improve the reliability of data reproduction recorded in the above.

  A data recording / reproducing apparatus according to the present invention includes an apparatus for recording / reproducing data on magneto-optical disks such as MO and MD, an apparatus for recording / reproducing data on magnetic disks such as HD and FD, a nonvolatile RAM, The present invention can also be applied to an apparatus that records or reproduces data on a recording medium such as a memory card such as a flash ROM.

1 is a block diagram illustrating a configuration of a video recording system according to an embodiment of the present invention. It is explanatory drawing which shows a format when video data and index information are recorded on the optical disk 4 shown in FIG. FIG. 3 is a flowchart showing processing at the time of video data recording in the optical disc apparatus 1 shown in FIG. 1. FIG. 6 is a flowchart showing a reproduction error process when index information is repeatedly recorded in the optical disc apparatus 1 shown in FIG. 1.

It is a flowchart figure which shows a process when the index information at the time of reproduction | regeneration of the optical disk with which the video data was recorded in the optical disk apparatus 1 shown in FIG. FIG. 6 is a flowchart showing processing when the index information is virtually generated and reproduced when the index information is not found during reproduction of the optical disc in the optical disc apparatus 1 shown in FIG. 1. It is explanatory drawing with which it uses for description of the finalization process in the optical disk apparatus 1 shown in FIG. It is explanatory drawing with which it uses for description of the finalization process in the optical disk apparatus 1 shown in FIG.

Explanation of symbols

1: optical disk device 2: host computer 3: interface 10: spindle motor 11: optical pickup 12: tracking motor 13: signal processing system unit 14: tilt motor 15: tilt control system unit 16: rotation control system unit 17: tracking control system Unit 18: Optical pickup control system unit 19, 34: Buffer memory 20, 35: CPU 21, 36: ROM 22, 37: RAM 23, 32: Interface controller 30: AV input / output system unit 31: Code multiplexing system unit 33 : Operation system / RTC 40: Lead-in area 41: Data recording area 42: Lead-out area 43: Reserve area 44: TOC 45, 52, 54, 56: Video data 46, 48, 53, 55, 57: Index Scan information 47: illegal index information 50: video data recording area 51: index information copy recording area 58 to 60: copy of the index information

Claims (25)

  Data recording means for recording data in a recording area of a recording medium, index information recording means for recording index information of the data in the recording area, and the recorded index each time index information is recorded by the index information recording means A data recording / reproducing apparatus comprising index information repetitive reproducing means for repeatedly reproducing information a predetermined number of times.   2. The data recording / reproducing apparatus according to claim 1, wherein the index information repetitive reproduction means is provided with means for changing a reproduction speed each time when the index information is repeatedly reproduced a predetermined number of times. A data recording / reproducing apparatus.   2. A data recording / reproducing apparatus according to claim 1, wherein said index information repetitive reproducing means is adapted to change the type of rotation of said recording medium each time when said index information is repeatedly reproduced a predetermined number of times. A data recording / reproducing apparatus comprising:   2. A data recording / reproducing apparatus according to claim 1, wherein said index information repetitive reproducing means is adapted to change the reproduction direction from the recording medium each time the index information is repeatedly reproduced a predetermined number of times. A data recording / reproducing apparatus comprising:   5. The data recording / reproducing apparatus according to claim 1, wherein an index information holding unit that holds index information recorded by the index information recording unit and a reproduction error due to reproduction by the index information repeated reproduction unit. Index information repetitive recording means for repeatedly recording the index information held by the index information holding means from the address next to the last successful recording address in the recording area of the recording medium. And a data recording / reproducing apparatus.   6. The data recording / reproducing apparatus according to claim 1, wherein the index information recorded in the recording area of the recording medium is reproduced, and the recording area of the recording medium is reproduced based on the reproduced index information. A data reproducing means for reproducing the data recorded on the recording medium, and when the index information cannot be reproduced during data reproduction by the data reproducing means, the latest index information that can be reproduced from the recording area of the recording medium A data recording / reproducing apparatus, comprising: alternative index information reproducing means for reproducing information.   7. The data recording / reproducing apparatus according to claim 6, wherein a menu for creating menu information by using reserve area securing means for securing a reserved area in the recording area of the recording medium and alternative index information reproduced by the alternative index information reproducing means. Information creating means and finalizing means for recording the menu information created by the menu information creating means in the reserved area secured by the reserved area securing means and closing the session with respect to the recording area of the recording medium And a data recording / reproducing apparatus.   2. The data recording / reproducing apparatus according to claim 1, wherein dedicated area securing means for securing a dedicated area for recording a copy of the index information in the recording area of the recording medium, and data in the recording area of the recording medium by the index information recording means. A data recording / reproducing apparatus comprising: index information copy recording means for recording a copy of the index information in a dedicated area secured by the dedicated area securing means after recording the index information.   A data recording step for recording data in a recording area of a recording medium, an index information recording step for recording index information of the data in the recording area, and the recorded index each time index information is recorded by the index information recording step A data recording / reproducing method comprising: an index information repetitive reproduction step of repeatedly reproducing information a predetermined number of times.   10. The data recording / reproducing method according to claim 9, wherein the index information repeated reproduction step includes a step of changing a reproduction speed for each time when the index information is repeatedly reproduced a preset number of times. A data recording / reproducing method.   10. The data recording / reproducing method according to claim 9, wherein in the index information repeated reproduction step, the type of rotation of the recording medium is changed each time the index information is repeatedly reproduced a preset number of times. A data recording / reproducing method characterized by comprising:   10. The data recording / reproducing method according to claim 9, wherein in the index information repeated reproduction step, a reproduction direction from the recording medium is changed each time when the index information is repeatedly reproduced a preset number of times. A data recording / reproducing method characterized by comprising:   13. The data recording / reproducing method according to claim 9, wherein an index information holding step for holding the index information recorded by the index information recording step, and a reproduction error in reproduction by the index information repeated reproduction step. Index information repetitive recording step of repeatedly recording the index information held in the index information holding step a predetermined number of times from the address next to the address that was last successfully recorded in the recording area of the recording medium. And a data recording / reproducing method.   14. The data recording / reproducing method according to claim 9, wherein index information recorded in the recording area of the recording medium is reproduced, and the recording area of the recording medium is reproduced based on the reproduced index information. A data reproduction process for reproducing the data recorded on the recording medium, and when the index information cannot be reproduced during the data reproduction by the data reproduction process, the latest index information that can be reproduced from the recording area of the recording medium is replaced with an alternative index. A data recording / reproducing method characterized by comprising an alternative index information reproducing step for reproducing as information.   15. The data recording / reproducing method according to claim 14, wherein a reserve area securing step for securing a reserved area in the recording area of the recording medium and a menu for creating menu information using the alternative index information reproduced by the alternative index information reproducing step. Information creation step and finalization step of recording the menu information created by the menu information creation step in the reserve area secured by the reserve area securing step, and closing the session with respect to the recording area of the recording medium And a data recording / reproducing method.   10. The data recording / reproducing method according to claim 9, wherein a dedicated area securing step of securing a dedicated area for recording a copy of index information in the recording area of the recording medium, and data in the recording area of the recording medium by the index information recording step. A data recording / reproducing method comprising: an index information copy recording step for recording a copy of the index information in a dedicated area secured by the dedicated area securing step after recording the index information.   A data recording procedure for recording data in a recording area of a recording medium on a computer, an index information recording procedure for recording index information of the data in the recording area, and each time index information is recorded by the index information recording procedure, A program for executing an index information repeated reproduction procedure for repeatedly reproducing recorded index information a predetermined number of times.   18. The program according to claim 17, wherein the program causes the computer to execute a procedure for changing the playback speed each time when the index information is repeatedly played back a predetermined number of times in the index information repeated playback procedure. .   18. The program according to claim 17, wherein the computer changes the type of rotation method of the recording medium each time when the index information is repeatedly reproduced by a predetermined number of times in the index information repeated reproduction procedure. A program for running   18. The program according to claim 17, wherein the computer changes a reproduction direction from the recording medium each time when the index information is repeatedly reproduced a predetermined number of times in the index information repeated reproduction procedure. A program for running   21. The program according to claim 17, wherein an index information holding procedure for holding index information recorded by the index information recording procedure in a computer and a playback error in playback by the index information repeated playback procedure. Index information repetitive recording procedure for repeatedly recording the index information held by the index information holding procedure from the address next to the address that was last successfully recorded in the recording area of the recording medium. A program to execute and.   The program according to any one of claims 17 to 21, wherein the computer reproduces the index information recorded in the recording area of the recording medium, and the recording area of the recording medium based on the reproduced index information A data reproduction procedure for reproducing the data recorded on the recording medium, and when the index information cannot be reproduced during data reproduction by the data reproduction procedure, the latest index information that can be reproduced from the recording area of the recording medium A program for executing an alternative index information reproduction procedure to be reproduced as information.   23. The program according to claim 22, wherein a menu for creating menu information using a reserved area securing procedure for securing a reserved area in a recording area of the recording medium and substitute index information reproduced by the substitute index information reproducing procedure is stored in the computer. Information creation procedure and finalization procedure for recording the menu information created by the menu information creation procedure in the reserve area secured by the reserve area securing procedure, and closing the session to the recording area of the recording medium and performing finalization A program to execute and.   18. The program according to claim 17, wherein a dedicated area securing procedure for securing a dedicated area for recording a copy of the index information in the recording area of the recording medium in the computer, and data in the recording area of the recording medium by the index information recording procedure. A program for executing an index information copy recording procedure for recording a copy of the index information in a dedicated area secured by the dedicated area securing procedure after recording the index information.   A computer-readable recording medium on which the program according to any one of claims 17 to 24 is recorded.

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