JP3744081B2 - Data recording / reproducing apparatus and method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides an optical disk recording / reproducing unit that records / reproduces data on / from an exchangeable disk-shaped recording medium, and a plurality of disk-shaped recording media that are operated in parallel to increase speed and capacity, and to provide redundancy. The present invention relates to a data recording / reproducing apparatus including a disk array recording / reproducing unit with improved reliability and a data recording / reproducing method using the same.
[0002]
[Prior art]
Recording / reproduction using a magnetic tape as a recording medium in an AV editing system for recording / reproducing or editing audio / video (AV) data, which has been conventionally used for broadcasting or other business requiring high image quality Devices (digital VTRs) have been used. A digital VTR using a magnetic tape is a recording / reproducing means capable of continuously recording digital AV data for a relatively long time, but cannot perform random access and has a low data transfer rate. Also, when editing data (material data) recorded on magnetic tape, the material data is transferred (dubbed) onto another magnetic tape, and the process of joining them in a desired order is repeated to edit the data. It was composed.
[0003]
On the other hand, in recent years, professional AV editing systems have a recording capacity capable of recording long-term digital AV data, and in order to improve data transfer speed, disk-like recording such as magneto-optical disk drives and hard disk drives. A so-called disk array device in which a plurality of media are connected in parallel has come to be used.
[0004]
A disk array device uses a disk-shaped recording medium such as a magneto-optical disk drive or a hard disk drive instead of a magnetic tape as a recording medium for recording and reproducing digital data such as video and audio. Are used in parallel to provide redundancy to ensure reliability and to improve the data transfer rate.
[0005]
Disk array devices are classified into five levels from RAID (Redundant Arrays of Inexpensive Disks) 1 to RAID 5 depending on reliability, interleaving method, error correction code storage method, operational characteristics, and the like.
[0006]
In general, digital data of video / audio has a feature that the size of data accessed at a time is larger than data handled for arithmetic processing in a computer. For this reason, in a disk array device that handles AV data, a RAID 3 type is used in which AV data is striped bit by bit or byte, and is read / written simultaneously to a plurality of hard disk drives, for example, and a hard disk that reads and writes parity is fixed .
[0007]
FIG. 8 shows an example of the configuration of a disk array apparatus that handles such AV data.
[0008]
In this disk array device 60, a plurality of hard disk drives (HDDs) are grouped, and AV data divided into, for example, 0, 1, 2,. ₁ , 61 ₂ , ..., 61 ₈ .. Are allocated and recorded via the disk array controller 62, and at the same time, only the parities P1, P2,... Calculated from the AV data are recorded. _P To ensure redundancy. Also, eight data HDDs 61 ₁ , 61 ₂ , ..., 61 ₈ One parity HDD 61 for each _P If the transfer rate per HDD is 24 Mbps, the transfer rate is ideally 192 Mbps.
[0009]
FIG. 9 shows a basic configuration example of an AV editing system using such a disk array device 60. Hereinafter, this configuration is considered as a basic configuration of the disk array device.
[0010]
When the AV editing controller 65 that performs editing processing on AV data and the disk array device 60 are connected by small computer system interfaces (SCSI) 66 and 67 that are general interfaces, an AV editing system is configured. The minimum unit of data to be accessed at one time, that is, the write / read size of the disk array device 60 is as shown in FIG. In other words, if the write / read unit (sector unit) per HDD is 512 bytes, for example, the size of the write / read unit of the disk array device is 512 × 8 = 4096 bytes.
[0011]
When considering the case of handling D2 standard AV data, two frames compressed to about 1/7 are used as video data, and audio data for four channels is also added, so the transfer format is shown in FIG. As shown in the figure, 8192-byte audio data is arranged for four channels following 163840-byte video data.
[0012]
In this transfer format, video data and audio data are multiples of 4096 bytes (shown as blocks in the figure) of the write / read unit of the disk array device 60 as shown in FIG. The break of data or the break of each audio data coincides with the break of the write / read unit in the disk array device 60.
[0013]
Therefore, even when editing operations such as rewriting only video data or changing the data by individually accessing the audio data of each channel, the data can be read / written without any problem. These functions can be realized without lowering.
[0014]
By the way, in recent years, with the improvement in HDD performance, it is possible to maintain or improve the overall transfer rate and capacity even if the number of HDDs used for data is reduced within one disk array device. It was.
[0015]
On the other hand, changing the number of HDDs in the disk array device changes the write / read unit in a RAID 3 configuration disk array device. For example, assuming that the number of HDDs in the disk array device 60 shown in FIG. 8 is reduced by one and one parity HDD is allocated to seven data HDDs, the write / read of the disk array device is performed. The unit size is 512 × 7 = 3584 bytes as shown in FIG.
[0016]
By using the disk array apparatus as described above for the AV data editing system, it becomes unnecessary to repeat the dubbing and joining of the material data as in the conventional AV data editing system using the VTR. It is possible to perform so-called nondestructive editing by simply changing the data access order.
[0017]
[Problems to be solved by the invention]
By the way, the disk array device described above is an alternative to a VTR that has been used conventionally as means for recording and reproducing AV data, but it is difficult to satisfy the condition of low power consumption and small size and light weight. It is not suitable as a recording / reproducing means used by being incorporated in a device that requires portability. For this reason, for example, it has been proposed to use a disk-shaped recording medium, particularly a rewritable optical disk, as a large-capacity exchangeable recording medium instead of a magnetic tape in a recording / reproducing apparatus such as a video camera for news gathering.
[0018]
An optical disk is a high-density, large-capacity recording medium, so that it can obtain the same recording time as a conventional magnetic tape, and is easy to handle because it is thin and stored in a cartridge. It has an excellent feature that it is possible and has a high data transfer rate.
[0019]
However, when an optical disk recording / reproducing apparatus is used, it is difficult to perform nondestructive editing on an optical disk because the time required for data access is longer than that of a magnetic disk apparatus. Therefore, when editing data recorded on an optical disk using a disk array device that should be capable of efficient editing work utilizing high transfer rate and random accessibility, the data recorded on the optical disk is Since the data must be transferred once to the array device and then edited on the disk array device, the editing operation cannot be performed during this time, so the time efficiency during editing is significantly low.
[0020]
The present invention has been made in view of the above circumstances, and transfers data recorded on an optical disk to a disk array device when editing data recorded on an optical disk that is a replaceable disk-shaped recording medium. An object of the present invention is to provide a data recording / reproducing apparatus and a data recording / reproducing method capable of reducing time and performing nondestructive editing efficiently.
[0021]
[Means for Solving the Problems]
In order to solve the above-described problems, a data recording / reproducing apparatus according to the present invention includes a first recording / reproducing unit for recording / reproducing data on an exchangeable disc-shaped recording medium, and data on a plurality of disc-shaped recording media. Second recording / reproducing means for recording / reproducing, first data reproducing means for accumulating data reproduced from the first recording / reproducing means and / or second recording / reproducing means, and the first recording It controls the transfer of the data reproduced from the reproducing means and the data reproduced from the second recording / reproducing means, and is reproduced from the disc-shaped recording medium exchangeable by the first recording / reproducing means, and the first recording / reproducing means. The data stored in one data storage unit is stored in the plurality of data at a time when the second recording / reproducing unit does not access data to a plurality of disc-shaped recording media. A data control means for transferring to a disk-shaped recording medium and a second data that is reproduced from the second recording / reproducing means and accumulated in the first data accumulating means is accumulated and output via the data control means. And 2 data storage means.
The data recording / reproducing method according to the present invention includes a step of recording / reproducing data on a disc-shaped recording medium exchangeable by the first recording / reproducing unit, and a plurality of disc-shaped recording media by the second recording / reproducing unit. A data recording / reproducing method comprising: a step of recording / reproducing data; and a step of accumulating data reproduced from the first recording / reproducing unit and / or the second recording / reproducing unit in a data accumulating unit, A step of storing and outputting the data reproduced from the second recording / reproducing means and stored in the first data accumulating means to the second data accumulating means, and exchangeable by the first recording / reproducing means; Data reproduced from the disc-shaped recording medium and stored in the data accumulating means is accessed by the second recording / reproducing means with respect to the disc-shaped recording medium. Characterized in that the not time to have a step of transferring to the plurality of disc-shaped recording medium.
[0022]
According to the data recording / reproducing apparatus and data recording / reproducing method of the present invention having such characteristics, the data is recorded on the replaceable disc-shaped recording medium while performing arbitrary recording / reproducing operations on the plurality of disc-shaped recording media. Since the stored data can be transferred to the plurality of disc-shaped recording media, efficient editing can be performed.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
An AV editing system that is an embodiment to which the present invention is applied will be described below with reference to the drawings.
[0024]
FIG. 1 is a block diagram showing a configuration example of a main part of an AV editing system according to the present invention.
[0025]
This AV editing system includes an optical disc recording / reproducing unit 10, an optical disc recording / reproducing unit 10, and a disk array recording / reproducing unit 30 which are means for reproducing data recorded on the rewritable optical disc 11 and recording / reproducing data on the optical disc 11. A data control unit 20 that controls the transfer of data to and from the disk array recording / reproducing unit 30 that is a unit that records and reproduces data on a plurality of disc-shaped recording media via the data control unit 20. A video processor 40 that outputs data as a reproduced video signal of a predetermined format to the outside, and a central processing unit (CPU) 50 for controlling the operation of each part of the AV editing system.
[0026]
The components of the AV editing system are connected to each other via a CPU bus for transmitting and receiving control signals and a data bus for transferring AV data such as audio / video, and the operation is controlled by the CPU 50. .
[0027]
The optical disk recording / reproducing unit 10 rotates and drives the optical disk 11 to write data or read recorded data, and the intensity of the laser light irradiated to the optical disk 11 by the optical system 12 of the optical disk drive 19. A laser control circuit 13 for controlling the signal, a channel code encoding / decoding circuit 14 for correcting a signal recorded and reproduced by the optical disk drive 19, and a correction code for correcting a data error due to a defect on the optical disk at the time of reproduction. Or an error correction code (ECC) encoding / decoding circuit 15 that actually corrects the error.
[0028]
The optical disc drive 19 further performs an RF circuit for processing a signal read from the optical disc 11 by the optical head unit, a laser power control circuit for controlling the laser intensity (power) of the optical head unit, and position control of the optical head unit. Servo circuit and the like are provided. The optical disk drive 19 will be described later.
[0029]
The data control unit 20 includes a first buffer memory 21 serving as a first data storage unit for storing input / output data of the disk array recording / playback unit 30, and the first buffer memory 21 via the data control circuit 23. ECC encoding / decoding for performing data error correction processing of the second buffer memory 22 as the second data storage means for storing the supplied data and supplying the data to the video processor 40, and the optical disc recording / reproducing unit 10. The data control circuit 23 is data control means for switching the data transfer direction between the circuit 15 and the second buffer memory 22 and the first buffer memory 21 based on the control of the CPU 50. The data control circuit 23 will be described later.
[0030]
The disk array recording / reproducing unit 30 includes a disk array unit 31 including, for example, eight hard disk drives (HDDs), and an access control unit 32 that controls data access to the disk array unit 31.
[0031]
The disk array unit 31 converts the distributed AV data into seven HDDs 31 of the data drive unit 31 under the control of the access control unit 32. ₁ , 31 ₂ , 31 _Three , 31 _Four , 31 _Five , 31 ₆ , 31 ₇ And the parity is recorded in one HDD 31p of the disk array unit 31. The disk array unit 31 includes seven HDDs 31. ₁ , 31 ₂ , 31 _Three , 31 _Four , 31 _Five , 31 ₆ , 31 ₇ On the other hand, by recording and reproducing AV data in parallel to improve the recording capacity and transfer speed, and by providing redundancy, higher reliability than that of a single disk device can be obtained.
[0032]
The access control unit 32 includes the HDDs 31 described above. ₁ , 31 ₂ , 31 _Three , 31 _Four , 31 _Five , 31 ₆ , 31 ₇ , 31 _P For example, a SCSI protocol controller (SPC) 33 which is a device controller connected to correspond to ₁ , 33 ₂ , 33 _Three , 33 _Four , 33 _Five , 33 ₆ , 33 ₇ , 33 _P And this SPC33 ₁ , 33 ₂ , 33 _Three , 33 _Four , 33 _Five , 33 ₆ , 33 ₇ , 33 _P Via each HDD 31 ₁ , 31 ₂ , 31 _Three , 31 _Four , 31 _Five , 31 ₆ , 31 ₇ , 31 _P A collection and distribution circuit 34 for collecting and distributing AV data and parity with each ₁ , 34 ₂ , 34 _Three , 34 _Four , 34 _Five , 34 ₆ , 34 ₇ , 34 _P And this collection and delivery circuit 34 ₁ , 34 ₂ , 34 _Three , 34 _Four , 34 _Five , 34 ₆ , 34 ₇ , 34 _P And a data multiplexer 35 that is provided between the data control unit 20 and performs switching selection of AV data, and a parity calculation circuit 36 that calculates parity from the AV data from the data multiplexer 35. The collection / distribution circuit 34 ₁ , 34 ₂ , 34 _Three , 34 _Four , 34 _Five , 34 ₆ , 34 ₇ , 34 _P Is configured to include a memory and a controller.
[0033]
Each SPC33 ₁ , 33 ₂ , 33 _Three , 33 _Four , 33 _Five , 33 ₆ , 33 ₇ , 33 _P Are controlled by a central processing unit (CPU) 50 according to each HDD 31. ₁ , 31 ₂ , 31 _Three , 31 _Four , 31 _Five , 31 ₆ , 31 ₇ , 31 _P Perform input / output control. Pick-up circuit 34 ₁ , 34 ₂ , 34 _Three , 34 _Four , 34 _Five , 34 ₆ , 34 ₇ , 34 _P The AV data is sent to each HDD 31 in accordance with a data selection signal that is a control signal from the CPU 50. ₁ , 31 ₂ , 31 _Three , 31 _Four , 31 _Five , 31 ₆ , 31 ₇ , 31 _P Distribute to and collect.
[0034]
The video processor 40 is for configuring the AV data transferred and stored in the second buffer memory 22 into a video signal in accordance with a predetermined format and outputting it to an external device or the like. For example, the video processor 40 is compressed and recorded. It has a function to expand the data. Further, when AV data is input to the AV editing system from an external device or the like, it is also input via the video processor 40.
[0035]
The CPU 50 controls the operation of each of the above-described units. In particular, the CPU 50 monitors the amount of data stored in the second buffer memory 22, and based on the result, the disk array recording / reproducing unit 30 outputs the first buffer. A function for controlling the amount of data transferred to the memory 21 and the data access idle time of the disk array recording / reproducing unit are monitored, and another data is transferred by switching the data transfer direction of the data control circuit 23 during the idle time. It has a feature that it can be controlled. Such control will be specifically described later.
[0036]
FIG. 2 shows a configuration example of the data control circuit 23 of the data control unit 20 of FIG.
[0037]
As described above, the data control circuit 23 receives data between the ECC encoding / decoding circuit 15 and the second buffer memory 22 and the first buffer memory 21 based on a switching signal that is a control signal from the CPU 50. The transfer direction can be freely switched.
[0038]
The data input / output direction of the ECC encoding / decoding circuit 15 is determined by the switch SW1 in accordance with a switching signal Control1 that is a control signal from the CPU 50. ₀ And switch SW1 ₁ Is determined by turning on / off. For example, when the switching signal Control1 is at H level, SW1 ₁ The control signal is turned to H level and turned on. On the other hand, at this time, SW1 ₀ The control signal to is turned to L level and turned off. As a result, the output from the ECC encoding / decoding circuit 15, that is, the reproduction signal from the optical disk 11, is output to the data buses D0, D1, D2, D3, D4, D, 5D, D6, and D7. When the switching signal Control1 is at the L level, the reverse operation is performed, and data is transferred from the data bus to the optical disc recording / reproducing unit 10 via the ECC encoding / decoding circuit 15.
[0039]
Similarly, the data transfer direction of the second buffer memory 22 is determined by the switch SW2 in accordance with a switching signal Control2 that is a control signal from the CPU 50. ₀ And SW2 ₁ Is selected by turning on / off, and the data transfer direction of the first buffer memory 21 is switched by the switch SW3 according to the switching signal Control3. ₀ And SW3 ₁ Is selected by turning on / off.
[0040]
FIG. 3 is a block diagram showing a configuration example of the optical disc drive 19 of the optical disc recording / reproducing unit 10 of the AV editing system according to the present invention.
[0041]
As described above, the optical disk drive 19 reads the data recorded on the optical disk 11, reads the data on the optical disk 11, writes the data on the optical disk 11, the optical system 12 including the optical head unit, the preamplifier, and the HF superimposing circuit, and the high frequency read from the optical disk 11. The RF circuit 16 that performs waveform equalization and demodulation processing on the reproduced signal, the laser power control circuit 17 that controls the laser light intensity (power) when data is recorded on the optical disk, and the signal is read from or written to the optical disk 11 It comprises a servo circuit 18 for controlling the position of the optical head section to be bent and a spindle motor 111 for rotating the optical disk 11.
[0042]
The optical system 12 includes a HF superimposing circuit 12a for reducing return light noise by high-frequency modulation of a semiconductor laser to make it multimode, a semiconductor laser (LD) 12b as a laser light source, and a reflected laser from the optical disk 11 during reproduction. A photodiode (PD) 12d that detects light and converts it into an electrical signal, an optical head fixing unit that includes a preamplifier 12e that immediately amplifies a reproduction signal from the photodiode 12d, and focuses the laser beam on the optical disc 11 The lens system 12c and the lens system 12c are finely moved to perform laser beam focus control, or the lens system 12c is moved to move the lens system to perform tracking control.
[0043]
The laser beam emitted from the semiconductor laser 12b after being subjected to intensity modulation corresponding to the input electric signal passes through the lens system 12c via the mirror and the beam splitter, and is always focused on a desired track position on the recording layer of the optical disc 11. Controlled to tie. The laser light is controlled by controlling a servo circuit 18 described later. The laser beam reflected by the recording layer of the optical disc 11 and given light intensity corresponding to the recording data again passes through the lens system 12c, is guided to the photodiode 12d side by the beam splitter, and corresponds to the light intensity by the photodiode 12d. Converted into an electrical signal and output. Since this output is weak, it is immediately amplified by the preamplifier 12e, and further subjected to processing such as demodulation by the RF circuit 16 described above to become a reproduced data signal.
[0044]
The laser power control circuit 17 controls the intensity of laser light emitted from the semiconductor laser 12b. In a rewritable optical disc, the laser beam intensity must be controlled to an appropriate level during data recording, erasing, and reproduction. Specifically, when a semiconductor laser is used as the laser light source, the laser light intensity can be controlled by controlling the drive current. In addition, by utilizing this fact, on-off modulation can be directly performed at the time of recording.
[0045]
The servo circuit 18 controls the position of the optical head for reading and recording signals from the optical disk 11, and includes a tracking servo circuit 18a, a focus servo circuit 18b, a radial servo circuit 18c, and a disk servo circuit 18d. . The tracking servo circuit 18a controls the optical head movable unit to follow the fluctuation of the signal track of the optical disc 11. The focus servo circuit 18b performs control so that the focus of the laser beam is always positioned on the recording layer following the surface vibration of the optical disc and the inclination of the rotation axis. The radial servo circuit 18c performs control for positioning (seeking) the optical head movable portion on a predetermined track by moving the movable portion of the optical head in the radial direction of the disk by the linear motor 12f. The disk servo circuit 18d controls the spindle motor 111 that rotates the optical disk 11 to a predetermined rotational speed.
[0046]
Next, prior to specific description of the function of the AV editing system having the configuration described with reference to FIGS. 1 to 3, non-destructive editing of AV data recorded on a disc-shaped recording medium will be described. 4 and FIG. In the following description, it is assumed that AV data recorded on a disc-shaped recording medium (hereinafter simply referred to as a disc) is video data shot by a video camera.
[0047]
FIG. 4 schematically shows the positional relationship between data A, data B, and data C, which are data (material data) necessary for editing, out of video data recorded on the disk. It is assumed that data A, data B, and data C are recorded in this order from the side.
[0048]
Now, consider a case where each of these material data is read out in the order of data A, data B, and data C and reproduced as a continuous moving image.
[0049]
Each data read from the disk is discontinuous as shown in FIG. 5A, and a free time is generated between the data. This is because the data A, data B, and data C are recorded on the optical disc 11 in physically discontinuous areas, so that the head portion of the recording / reproducing apparatus moves to the data areas to read the data. This is because access time is required.
[0050]
As described above, when the data A, data B, and data C, which are each material data read from the disc, are data recorded in real time, the moving image reproduced from these data is also discontinuous. End up. However, when video data is recorded on a recording medium such as a disk, it is usually compressed and recorded. The video data read from the disk is once stored in a memory, and the stored data Are sequentially read based on the control signal, and are decompressed and reproduced as real-time video.
[0051]
For this reason, when the access time and data transfer time between the data A, data B, and data C, which are video data recorded on the disc, are shorter than the real time reproduction time, that is, to the next data. When the access time and the data transfer time are shorter than the real time playback time of the data that has already been read and stored in the memory, the video can be played back continuously, so-called nondestructive editing can be performed. It will be.
[0052]
Specifically, as in the example of FIG. 5B, when the reading of the data B can be started before the real time reproduction of the video A obtained by reproducing the data A is completed, the video A and the video B is a continuous video. The same applies to the relationship between data B and data C.
[0053]
However, as in the example of FIG. 5C, the access time and the data transfer time between the data A, data B, and data C, which are video data recorded on the disc, are less than the actual reproduction time. When it is long, that is, when the access time to the next data and the data transfer time exceed the playback time of the already read data, the video cannot be played back continuously. . Therefore, in this case, nondestructive editing cannot be performed.
[0054]
Specifically, as in the example of FIG. 5D, when the reading of the data B cannot be started even after the real-time reproduction of the video A obtained by reproducing the data A is completed, the video A and the video B becomes a discontinuous image. The same applies to the relationship between data B and data C.
[0055]
Here, when the optical disk 11 in the AV editing system having the configuration illustrated in FIG. 1 is assumed as the disk-shaped recording medium, the above-described data access time is determined by moving the optical head movable unit including the lens system 12c by the linear motor 12f. Then, the positioning operation is performed on the track in which the desired data is recorded and the disk rotation waiting time until the head of the desired data reaches the head position in the positioned track.
[0056]
That is, in order to read each data shown in FIG. 4 with the optical disk drive 19, first, a track in which the data A is recorded by the linear motor 12f on the optical head movable part including the lens system 12c of the optical system 12 is recorded. (Seek), and then an accurate positioning (tracking) is performed by an actuator for tracking control. Further, the lens system 12c is finely moved to perform laser beam focus control. When the head of the data A is detected, reading is started. When the reading of data A is completed, the optical head movable portion is sought to the track on the inner circumference side where data B is recorded, and tracking and focus control are performed to search the beginning of data B. This search is performed by waiting for the head of the data B to come to the optical head position by rotating the disk while the optical head movable portion is positioned on the track. Then, when the head of data B is detected, reading is started. When the reading of data B is completed, the optical head is further sought to the track on the inner circumference side, tracking and focus control are performed, and the head of data C is searched. The search at this time is also performed by waiting for the head of the data C to come to the optical head position by rotating the disk while the optical head movable portion is positioned on the track.
[0057]
It is assumed that the position on the optical disc 11 where the video data is recorded is obtained by referring to TOC (Table Of Contens) information written in a predetermined area of the optical disc 11 in advance.
[0058]
The access time of such an optical disk recording / reproducing unit typically requires 40 ms for a 5-inch diameter optical disk, and a maximum rotation waiting time of about 17 ms, and a maximum of about 57 ms. On the other hand, the HDD access time is 20 ms for head movement (seek), the rotation waiting time is about 8 ms, and about 28 ms at the maximum.
[0059]
As described above, the optical disk recording / reproducing unit 10 moves the optical head movable unit heavier than the magnetic disk head, and therefore requires about twice as much access time as the disk array recording / reproducing unit 30. When recording and playback is performed using the maximum allowable transfer rate, there is no room for non-continuous data access time, and it may be difficult to perform nondestructive editing on an optical disc. is there.
[0060]
For this reason, in the AV editing system according to the present invention having the configuration illustrated in FIG. 1, when the data recorded on the optical disk 11 is nondestructively edited, all the material data necessary for editing is first recorded on the optical disk recording / reproducing unit. 10 and transferred to the disk array recording / reproducing unit 30, and non-destructive editing is performed by sequentially reproducing material data from the disk array recording / reproducing unit 30 under the control of the CPU 50.
[0061]
The operation when performing nondestructive editing using this AV editing system will be described below.
[0062]
As described above, since the broadcasting business equipment requires high image quality, the transfer rate of data read from the optical disk is as high as 25 to 35 Mbps even when data is compressed. Professional equipment can maintain such a high transfer rate continuously, but it takes a considerable amount of time to transfer a large amount of video data, and it takes time to transfer the data at the start of editing. Was wasted.
[0063]
In this AV editing system according to the present invention, in order to substantially shorten the data transfer time, the data is recorded / reproduced by the disk array recording / reproducing unit 30 while the data is recorded from the optical disc recording / reproducing unit 10 in the idle time. It is configured to be able to transfer.
[0064]
FIG. 6 shows a state in which data is being transferred from the optical disk 11 to the disk array recording / reproducing unit 30 while editing is performed using the video data stored in the second buffer memory 22 and the first buffer memory 21. Show. Here, the data control unit 23 is expressed as a simple switch for selecting the data transfer direction.
[0065]
FIG. 6A shows the data drive 31 of the disk array recording / reproducing unit 30. ₁ ~ 31 ₇ The flow of data when the recorded data is reproduced and output is shown.
[0066]
At this time, the SPC 33 corresponding to each HDD is changed from each HDD of the disk array unit 31. ₁ ~ 33 ₇ Data output via the data buffer 35 are collected by the data multiplexer 35 and stored in the first buffer memory 21. The data stored in the first buffer memory 21 has its output destination selected by the data control circuit 23 and is supplied to and stored in the second buffer memory 22. The data stored in the second buffer memory 22 is read out in a desired order constituting the editing data by a control signal from the CPU 50, and is output as a continuous video signal by the video processor 40.
[0067]
6B shows a data flow when data recorded on the optical disk 11 is reproduced by the optical disk recording / reproducing unit 10 and transferred to the data drives HDD1 to HDD7 of the disk array recording / reproducing unit 30. FIG.
[0068]
At this time, the data read from the optical disc 11 by the optical disc drive 19 of the optical disc recording / reproducing unit 10 is decoded by the channel code encoding / decoding circuit unit 14 and subjected to error correction or the like by the ECC encoding / decoding circuit 15. Data synthesis. Then, the data control circuit 23 selects the data transfer destination in the first buffer memory 21, and the data is stored in the first buffer memory 21. The data stored in the first buffer memory 21 is distributed to each data drive of the disk array unit 31 by the data multiplexer 35 and recorded via the corresponding SPC.
[0069]
In FIG. 6, when data is transferred from the optical disk recording / playback unit 10 to the disk array recording / playback unit 30, no video playback signal is output, but the data control circuit 23 inputs / outputs signals. Since it can be arbitrarily controlled, it is of course possible to simultaneously output a video reproduction signal of data recorded on the optical disk.
[0070]
FIG. 7 shows changes in the amount of data stored in the second buffer memory 22 when performing nondestructive editing using the AV editing system according to the present invention having the configuration illustrated in FIG.
[0071]
When performing data editing, this AV editing system stores desired material data in the first buffer memory 21, sequentially reproduces them based on a control signal from the CPU 50, and continues to the second buffer memory 22. Is stored as typical playback data. Then, the data stored in the second buffer memory 22 is output as a playback video signal via the video processor 40. At this time, the amount of data stored in the first buffer memory 21 is controlled by the CPU 50 according to the amount of data stored in the second buffer memory 22.
[0072]
FIG. 7A shows a state in which data A, data B, and data C are sequentially read from the optical disc 11 and stored in the second buffer memory 22 in FIG. That is, while the data A is being read from the optical disc 11, the data A is accumulated in the second buffer memory 22 via the first buffer memory 21 and the data control circuit 23. To increase. When the reproduction of the data A is completed, the data A stored in the second buffer memory 22 continues to be supplied to the video processor 40 until the data B is read from the optical disk 11 next time. The amount of data in the buffer memory 22 decreases with time. Next, when data B is read from the optical disk 11, the amount of data stored in the second buffer memory 22 similarly increases with time, and when the reproduction of data B is completed, it is stored in the second buffer memory 22. Since the data B continues to be supplied to the video processor 40, it decreases again with time. The same applies to data C.
[0073]
As described above, if data is accumulated in the second buffer memory 22, that is, accumulation of the next data is started before the output of the data accumulated in the second buffer memory 22 is completed. For example, a continuous reproduction video signal can be obtained from the video processor 40.
[0074]
FIG. 7B shows a free time in which data A, data B, and data C that have already been transferred from the optical disk 11 to each data drive of the disk array unit 31 in FIG. 4 shows a change in the data amount of the second buffer memory 22 when data D, data E, and data F are transferred from the optical disk 11 to the data drive of the disk array unit 31. 1 also shows the operating state of the data control circuit 23 that controls the flow of data.
[0075]
That is, each data drive 31 of the disk array unit 31 ₁ ~ 31 ₇ The data A read out from the data are collected by the data multiplexer 35 via the SPC corresponding to each data drive and stored in the first buffer memory 21. At this time, since the data control circuit 23 is in a state of transferring data from the first buffer memory 21 to the second buffer memory 22, the data A stored in the first buffer memory 21 is stored in the data control circuit 23. Since the data is transferred to the second buffer memory 22 via the circuit 23 and output, the amount of data in the second buffer memory 22 increases with time. This operation state corresponds to the state shown in FIG. 6A, and “state (a)” is displayed in FIG. 7B.
[0076]
Next, when all the data A is accumulated in the buffer memory 22, the data control circuit 23 is switched to a state of transferring data from the ECC encoding / decoding circuit 15 to the first buffer memory 21 under the control of the CPU 50. . During this time, data D is read from the optical disk 11 and transferred to the data drive of the disk array unit 31. On the other hand, the data A stored in the second buffer memory 22 continues to be reproduced and output via the video processor 40, so the amount of data in the second buffer memory 22 decreases with time. This operation state corresponds to the state shown in FIG. 6B, and “state (b)” is displayed in FIG. 7B.
[0077]
Thereafter, similarly, each data drive 31 of the disk array unit 31 ₁ ~ 31 ₇ The data B is read out from the optical disk 11 and stored in the second buffer memory 22. While the stored data is being reproduced and output, the data control circuit 23 is switched to read out the data E from the optical disk 11. Transfer to each data drive. The same applies to data C and data F.
[0078]
As described above, according to the AV data editing apparatus, the video data recorded on the optical disk 11 can be reproduced while the arbitrary video data stored in the disk array recording / reproducing unit 30 is continuously reproduced. 30. This data transfer operation is started immediately after the optical disk 11 is inserted into the optical disk recording / reproducing unit 10, for example, and the CPU 50 automatically detects the time when the disk array recording / reproducing unit 30 is not accessing data. All data recorded on the optical disk 11 is transferred.
[0079]
Further, according to this AV data editing apparatus, it is also possible to transfer the data to the disk array recording / reproducing unit 30 while reproducing the video data recorded on the optical disk 11 and confirming the contents. At this time, the data control circuit 23 transfers data to both the second buffer memory 22 and the first buffer memory 21.
[0080]
Further, this AV data editing apparatus transfers the nondestructively edited video data stored in the disk array recording / playback unit 30 to the optical disk 11 as it is and stores it as a physically continuously recorded file. Transfer and copy another video data stored in the disk array recording / playback unit 30 to the optical disc 11 while continuously playing back any video data stored in the array recording / playback unit 30 and checking the contents. Is also possible.
[0081]
Further, when video data is recorded using this AV data editing apparatus, video data is continuously recorded on the optical disk 11 as an exchangeable recording medium for archiving, while the disk array recording / reproducing unit 30 is nondestructive. It is also possible to record video data for editing. According to such a recording / reproducing method, data editing, which conventionally required a dubbing operation and a data joining operation, can be performed at a time.
[0082]
【The invention's effect】
A data recording / reproducing apparatus according to the present invention transfers material data recorded on an optical disc to a plurality of disc-shaped recording media, reproduces the material data in a desired order, and edits it into a continuous reproduction signal on a buffer memory. To do. At this time, transfer of data from the optical disk to the plurality of disk-shaped recording media is automatically performed at a time when data access to the plurality of disk-shaped recording media is not performed. Can be done efficiently.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration example of an AV editing system which is an embodiment of a data recording / reproducing apparatus according to the present invention.
FIG. 2 is a block diagram showing a configuration example of a data control unit which is a main part of the AV editing system.
FIG. 3 is a block diagram showing a configuration example of an optical disc drive that is a part of the AV editing system.
FIG. 4 is a diagram for explaining material data recorded in different areas on an optical disc.
FIG. 5 is a diagram for explaining an access time when reproducing the material data shown in FIG. 5;
6 is a block diagram for explaining a data flow when data editing is performed using the AV editing system shown in FIG. 1; FIG.
7 is a diagram for explaining a change in the amount of data in the buffer memory when data editing is performed using the AV editing system shown in FIG. 1; FIG.
FIG. 8 is a block diagram of a conventional disk array device.
9 is a block diagram of an AV editing system configured using the disk array device shown in FIG. 5. FIG.
10 is a diagram showing an arrangement of data on an HDD used in the disk array device shown in FIG. 8. FIG.
FIG. 11 is a diagram illustrating a specific example of a transfer format.
12 is a diagram for explaining the operation of the disk array device shown in FIG. 8; FIG.
13 is a diagram showing data arrangement when HDDs constituting the disk array device shown in FIG. 8 are reduced.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Optical disk recording / reproducing part, 11 Optical disk, 12 Optical system, 13 Laser control circuit, 14 Channel code encoding / decoding circuit, 15 ECC encoding / decoding circuit, 19 Optical disk drive, 20 Data control part, 21 1st buffer memory , 22 second buffer memory, 30 disk array recording / playback unit, 31 disk array unit, 32 access control unit, 33 device controller (SPC), 34 collection / distribution circuit, 35 data multiplexer, 36 parity operation circuit, 40 video processor, 50 Central processing unit (CPU)

Claims (5)

First recording / reproducing means for recording / reproducing data on an exchangeable disc-shaped recording medium;
Second recording / reproducing means for recording / reproducing data on / from a plurality of disc-shaped recording media;
First data storage means for storing data reproduced from the first recording / reproducing means and / or the second recording / reproducing means;
A disc-shaped recording medium that controls the transfer of the data reproduced from the first recording / reproducing means and the transfer of the data reproduced from the second recording / reproducing means, and is exchangeable by the first recording / reproducing means. The data recorded in the first data storage means and recorded in the plurality of disk-shaped recordings at a time when the second recording / playback means does not access data to the plurality of disk-shaped recording media. Data control means for transferring to the medium;
And second data storage means for storing and outputting the data reproduced from the second recording / reproducing means and stored in the first data storage means via the data control means. Data recording / reproducing device The data recording / reproducing apparatus according to claim 1, wherein the amount of data transferred to the first data storage means is controlled based on the amount of data stored in the second data storage means. The data recording / reproducing apparatus according to claim 1, wherein the exchangeable disc-shaped recording medium is a rewritable optical disc. A step of recording / reproducing data on a disc-shaped recording medium exchangeable by the first recording / reproducing means; a step of recording / reproducing data on a plurality of disc-shaped recording media by the second recording / reproducing means; a recording and reproducing means and / or data recording and reproducing method and a step of storing the data reproduced from said second recording and reproducing means in the data storage means,
Accumulating and outputting the data reproduced from the second recording / reproducing means and accumulated in the first data accumulating means to the second data accumulating means;
Data reproduced from the disc-shaped recording medium exchangeable by the first recording / reproducing means and stored in the data accumulating means is not accessed in the second recording / reproducing means. Transferring to the plurality of disc-shaped recording media in time; and
Data recording and reproducing method, which comprises a. The data recording / reproducing method according to claim 4, wherein the data is video / audio data.

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