JP3531608B2 - Data recording / reproducing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording / reproducing apparatus, and more particularly to a data recording / reproducing apparatus for recording / reproducing data including video and / or audio data in a disk array composed of a plurality of hard disk devices.

[0002]

2. Description of the Related Art In recent years, an information signal transmitting apparatus for transmitting an information signal such as a video signal, an audio signal or a character signal has been
In order to improve the storage capacity for recording the information signal and the transfer rate performance, application of a disk array device in which a plurality of disk-shaped recording media such as a magneto-optical disk and a hard disk are connected in parallel is being studied. What is characteristic of recording in this disk array device is that the input information signal is distributed, interleaved, and stored in a plurality of disk devices connected in parallel.

Since this disk array device can improve the recording capacity and transfer rate performance as described above, it has higher reliability than a single disk device,
Suitable as a mass storage medium. This disk array device is a RAID (Redundant Arrays of Inexpensive D
iskes), and is divided into five levels from RAID1 to RAID5 as shown in Table 1 below, based on reliability, interleaving, error correction code storage, and operational characteristics.

[0004]

[Table 1]

RAID 1 is intended to improve reliability by recording the information data shown in FIG. 13A on the duplicated disks D1 and D2 as shown in FIG. 13B. This duplicated disc is called a mirrored disc, and is not interleaved and has no error correction code.

The RAID 2 interleaves the information data shown in FIG. 13A in bit units as shown in FIG. 13C to form four disks D1, D2, D3 and D4. Is stored. Also, an error correction code which is a Hamming code is stored in a dedicated disk. The error correction code is stored in a plurality of disks such as the dedicated disks D5 and D6 because the error correction code is a Hamming code.

The RAID3 interleaves the information data shown in FIG. 13A in bit units as shown in FIG. 13D, and makes four disks D1, D2, D3 and D4. Is stored. An error correction code, which is a parity code, is stored in the dedicated disk D5. This RAID3 is RA
Together with ID2, it improves reliability and data transfer rate.

The RAID4 interleaves the data shown in FIG. 13A in sector units as shown in FIG. 13E, and the disks D1, D2 and D3 are interleaved.
And disc D4. An error correction code, which is a parity code, is stored in the dedicated disk D5. The RAID 4 stores data by performing interleaving on a sector-by-sector basis, so that high-speed reading can be performed by random access.

In RAID 5, the data shown in FIG. 13A is interleaved in sector units as shown in FIG. 13F, and the disks D1, D2 and D are interleaved.
3, the disk D4 and the disk D5 are stored in five disks, and the error correction code which is a parity code is distributed and stored in each disk. This RAID5
Also, since data is stored by performing interleaving on a sector-by-sector basis, high-speed reading is possible by random access.

Therefore, the information signal transmitting device using the disk array devices of RAID 2 and 3 is
Since the disk array devices 3 and 3 interleave the information data in bit units, the disk array device is suitable for normal reproduction such that continuous data is read at high speed.

On the other hand, the information signal transmitting device using the disk array devices of RAID 4 and 5 is
Since the disk array device described above interleaves information data in sector units, it is suitable for double-speed reproduction in which discrete data is read at high speed.

[0012]

However, RAID 2 and RAID 3 are not suitable for double speed reproduction because they do not have a random access function for reading continuous data intermittently. Further, in RAID 4 and 5, there are problems that the sector size cannot be determined depending on the double speed number of double speed reproduction, or that access concentrates on a specific disk.

The present invention has been made in view of the above situation, and an object of the present invention is to provide a data recording / reproducing apparatus capable of easily performing special reproduction represented by double speed reproduction.

[0014]

In order to solve the above problems, a data recording / reproducing apparatus according to the present invention records / reproduces data including video and / or audio data on a disk array composed of a plurality of hard disk devices. In the data recording / reproducing apparatus, recording means for recording the data so that each field or frame of the input video data is recorded cyclically in N hard disk devices in the input order of the field or frame. and a reproducing means for reading out the video data from each of the hard disk devices every (n-1) units when reproduction at n times speed is requested.

When the n-fold speed reproduction is requested, the reproducing means outputs n times more data from each hard disk device than the 1-times speed reproduction.
Read twice as much data. Further, when the data cannot be read from each hard disk device by the n-fold speed reproduction, the reproducing means interpolates and outputs the data that cannot be read from the data of the field or frame before and after the data that cannot be read.

[0016]

This data recording / reproducing apparatus realizes n-times speed reproduction by reading the video data from each hard disk device every (n-1) units using the reproducing means.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments to which the data recording / reproducing apparatus according to the present invention can be applied will be described below with reference to the drawings.

This embodiment is a video signal transmitting apparatus for transmitting video signals of a plurality of files in response to independent individual video information providing requests. As shown in FIG. 1, the video signal transmitting apparatus of this embodiment is a large capacity storage unit 1 for storing information signals of a plurality of files, which is a specific example of the data recording / reproducing apparatus of the present invention, and this large capacity storage apparatus. The device interface 2 for performing format conversion and timing adjustment on the video signal of each file read from the unit 1 and the video signal of each file supplied from the mass storage device unit 1 via the device interface 2 to the requester. A user memory unit 3 which is an input / output unit having an input / output buffer memory for data rate conversion for adjusting the input / output transfer rate for supplying, and a file head which is information of the head portion of the file via the device interface 2. Cue memory section 4 for storing partial information signals and user memory section 3
Selection unit 7 for selectively switching the video signal of each file output from the file and the file head portion information signal output from the cue memory unit 4 to supply to the requester, the mass storage device unit 1, the device interface 2, a memory control unit 5 for controlling data input / output of the user memory unit 3 which is an input / output unit 3, a cue memory unit 4, and a data selection of the selection unit 7, and memory control by receiving request information from each requester. The unit 5 is provided with a device control unit 6 for instructing creation / update of an input / output schedule table described later.

As shown in FIG. 2, a large-capacity storage unit 1, which is a specific example of the data recording / reproducing apparatus of the present invention, is a disk unit 10 ₁ , such as a hard disk, which is a small-scale storage unit for 30 units. 10 ₂ , 10 ₃ ... 10 ₂₉ , 10
_The disk array unit 10 is composed of ₃₀ and a disk array control unit 20 for controlling the disk array unit 10. The disk array unit 10 stores the video data distributed under the control of the disk array control unit 20, interleaved, and input. The disk array unit 10 can perform recording and reproduction in parallel with respect to a plurality of hard disk devices to improve the storage capacity and transfer rate, and can obtain higher reliability than a single disk device.

When there are a plurality of units (hereinafter referred to as files) of an input video signal or a group of video signals which are collectively referred to as a title, the disk array unit 10 transfers the file video to the disk devices 10 ₁ , 10 ₂ , 10 _3.・
-Distribution into 10 ₂₉ and 10 ₃₀ and storing. Then, the disk array control unit 20 reads out a part of the plurality of file videos from the disk array unit 10 every unit time in response to a command from the memory control unit 5, so that each file video is sent to the requester. .

The disk array controller 20 controls each disk
Device 10₁, 10_Two, 10_Three... 10₂₉, 10_Thirty
Device controller 21 connected to correspond to
₁, 21_Two, 21_Three... 21₂₉, 21_ThirtyAnd each device
Vice controller 21₁, 21_Two, 21_Three... 21
₂₉, 21_ThirtyEach disk device 10 via₁, 1
0 _Two, 10_Three... 10₂₉, 10_ThirtyVideo with each
Pickup / delivery controller 22 that picks up and delivers signals₁, 22_Two, 2
Two_Three... 22₂₉, 22_ThirtyAnd each pickup and delivery controller
Division / synthesis unit 23 connected so as to correspond to₁, 23
_Two, 23_Three... 23₂₉, 23_ThirtyAnd each division / combination
Part 23₁, 23_Two, 23_Three... 23₂₉, 23_ThirtyWhen
Video signal provided between device interfaces 2
And a selector 24 for performing switching selection.

Each device controller 21 ₁ , 21 ₂ ,
21 ₃ ... 21 ₂₉ , 21 ₃₀ each of the disk devices 10 ₁ , 10 ₂ , 10 ₃ , ...
.. 10 ₂₉ , 10 ₃₀ input / output control is performed.

Each collection / delivery controller 22 ₁ , 22 ₂ , 22
₃ ... 22 ₂₉ , 22 ₃₀ send the video signals of the respective files to the respective disk devices 10 ₁ , 10 ₂ , 10 ₃ ... 10
Distribute and collect on ₂₉ , 10 ₃₀ . Collection and delivery controller 22 ₁ , 22 ₂ , 22 ₃ ... 22 ₂₉ , 22
₃₀ are all disk devices 10 ₁ , 10 ₂ ,
10 ₃ ... 10 ₂₉ , 10 ₃₀ are connected by data lines, and one required data line is selected from each data line based on a data selection signal from the memory control unit 5, and video signals are distributed. In addition, the video signal input via the device interface 2 is divided to divide each of the disk devices 10 ₁ ,
10 ₂ , 10 ₃ ... 10 ₂₉ , 10 ₃₀ are sent out.

Each of the division / synthesis units 23 ₁ , 23 ₂ , 23 ₃ ...
.. 23 ₂₉ and 23 ₃₀ are defective portions or some kind which occur when the video signals are divided / combined or the video signal transmission request from the requester exceeds the reproduction capability of the disk device constituting the disk array unit 10. Disk array unit 1 due to
Interpolate the lacking video signal when the disk device forming 0 cannot reproduce the video signal. The division / combination of video signals is performed by all the disk devices 10 ₁ , 10 ₂ , 10 depending on the purpose.
_In some cases, the video signals of ₃ ... 10 ₂₉ and 10 ₃₀ are used, and in some cases, and sometimes in some cases, only the data of one disk device is used. This depends on the speed of playback. For example, in the case of normal reproduction, frame data is collected from all 30 disk devices and continuous data for normal reproduction is combined. In addition, for example, in the case of 2 × speed reproduction, every 15 units out of 30 units are selected and 2 units are selected.
Combines continuous data of double speed playback. The amount of data read from the 15 disk devices is twice that of normal reproduction. This doubling does not mean doubling the reading speed, but the reading frequency when reading a certain amount of data corresponding to the request of many requesters per unit time is set to a double speed reproduction requester. This means double the number of normal playback requesters. For example, in the case of 30 × speed reproduction, a video signal is read from one disk device 30 times more frequently than in normal reproduction. In this way, the dividing / combining units 23 ₁ , 23 ₂ , 23 _3, ... 23 ₂₉ , 23
₃₀ is a collection / delivery controller 22 ₁ , 22 ₂ , 22 ₃ ... 2 according to the reproduction speed requested by the requester.
The frequency of video signal reading is increased by the flexible data selection in 2 ₂₉ and 22 ₃₀ and the combination thereof.

The dividing / combining units 23 ₁ , 23 ₂ , 23 ₃
As shown in FIG. 3, an arbitrary division / combination unit, for example, a division / combination unit 23 ₁ of 23 ₂₉ , 23 ₃₀ has buffer memories 31 and 32 and address generators 33 and 34.
And an interpolator 35.

The two buffer memories 31 and 32 form a double buffer memory.

The two address generators 33 and 34 are
Data collection and delivery controller 22 ₁Side input / output address
And the input / output address of the selector 24 side.
The interpolator 35 interpolates the missing data in the previous and subsequent frames.
There is. That is, as shown by the broken line from the interpolation unit 35,
The addresses are supplied to the far memories 31 and 32 so that
Read the frame data, create interpolation data, and
Data is supplied to the buffer memories 31 and 32.
It The interpolator 35 has a timing signal and an address generator.
Formation control signal, buffer memory control signal and interpolation control signal
Is supplied from the memory control unit 5.

In the interpolation by the interpolator 35, the video signal transmission request from the requester is transmitted to the disk array unit 1 as described above.
The defective portion that occurs when the reproduction capacity of the disk device constituting 0 is exceeded is interpolated. For example, when high-speed reproduction is performed, access concentrates on a certain disk device. For example,
In the case of 30 × speed reproduction, a video signal of 30 times the frequency of normal reproduction, that is, 30 frames / second is read from one disk device. Therefore, since there is a reproduction request from another requester, the reading of the disk device exceeds the maximum transfer rate, which is the performance limit, and the video signal cannot be supplied to the requester. It is the interpolating unit 35 that prevents such a situation from occurring. The interpolation in the interpolation unit 35 is performed by interpolating the insufficient frame from the temporally preceding and following frames as described above. In this embodiment, the interpolation is performed in frame units, but it may be performed in field units. This interpolation is effective for a video signal having a strong data correlation between frames or fields. If the video signal is a compressed video and cannot be interpolated as it is, the interpolation unit 35 may temporarily expand the compressed data and interpolate it, and then compress and send the generated video.

Further, this interpolation is not only for compensating for insufficient data due to access concentration, but when a disk device fails, the data of the disk device is generated by interpolating with the data of another disk device. It can be used as a so-called error data correction function or correction function.

The selector 24 is used by each division / synthesis unit 23.₁, 2
Three_Two, 23_Three... 23₂₉, 23 _ThirtySelect the output of
Or conversely, each division / synthesis unit 23₁, 23_Two, 23_Three・ ・
・ 23₂₉, 23_ThirtyDevice interface 2 to
Distribute data through.

The user memory unit 3 is for data rate conversion for adjusting the input / output transfer rate in order to supply the video signal supplied from the mass storage device 1 via the device interface 2 to the requester as described above. I / O buffer memory. The video signal supplied from the mass storage device 1 via the device interface 2 has a high transfer rate because a plurality of files are accessed in a unit time. On the other hand, since the transfer speed of the video signal output to the requester is slow, this user memory unit 3 is required as an input / output buffer in order to adjust this transfer speed.

The user memory unit 3 has a number of user memories 3 ₁ , 3 _2, ... 3 _n corresponding to the number of requesters. For example, one user memory 3 ₁ is configured as shown in FIG. That is, the user memory 3 ₁
Is a double-buffered memory 10 and memory 11 in which data can be output to one side while the other side is outputting data, and input / output of these memories 10 and 11 is instructed by the memory control unit 5. A user memory address control unit 12 that controls and also generates write and read addresses. Then, the user memory address control unit 12 according to the instruction of the memory control unit 5 adjusts the transfer speed of the video signal supplied from the mass storage device unit 1 via the device interface 2 or the memory 10. Input / output to / from the memory 11. The video signal output from the memory 10 or the memory 11 is supplied to the selection unit 7.

The selection unit 7 is provided with requesters H ₁ , H _2, ...
It has selectors 7 ₁ , 7 ₂ ... 7 _n according to the number of H _n , and requests the requesters H ₁ , H ₂ according to the control of the memory control unit 5.
.. output to H _n the video signal of each file from the user memory unit 3 or the file head portion information signal of each file from the cue memory unit 4. Of course, the file head portion information signal is output for a predetermined time, for example, several tens of seconds, and then the video signal following the file head portion information signal is output from the user memory unit 3.

The cue memory unit 4 stores the file head portion information signal which is the head portion of the video signal through the device interface 2 as described above. The cue memory unit 4 is configured as shown in FIG.
That is, the cue memory unit 4 reads the file head part information signal through the device interface 2 and reads the cue memory 14, and writes / reads the file head part information signal to the cue memory 14.
It is composed of a cue memory address control unit 13 which controls reading and generates an address.

The cue memory address control unit 13 samples the video signal read address supplied from the user memory unit 3 at a frequency n times as high as the timing signal.
The double sampling unit 15, the write address generation unit 16 that generates the write address of the file head portion information signal at the instruction timing from the memory control unit 5, and the read address of the file head portion information signal that is supplied from the n times sampling unit 15. Or the write address supplied from the write address generation unit 16 is selected based on an instruction from the memory control unit 5, and the cue memory 1 is selected.
4 and an address selector 17 which supplies the data to the address selector 4.

[0036] From the user read address of the video signal supplied from the memory 3 _1, file beginning address address arithmetic unit 41 ₁ is supplied from the memory controller 5 1
The value obtained by subtracting is added by the adder 42 ₁ . The output signal of the adder 42 ₁ is the address data sequential reading unit 4
3 are sequentially read so as to be sampled at a clock n times as high as the timing signal supplied from the memory controller 5, and are supplied to the address selector 17 as a read address of the file head portion information signal. Signal adder 4 a read address of the video signal supplied from the user memory 3 ₂ is also supplied from the address calculation unit 41 ₂
Are added in 2 _2, is supplied to the address data sequentially reading unit 43, sequentially read as sampled at n times the clock of the timing signal supplied from the memory controller 5, the file head portion information to the address selector 17 It is supplied as a signal read address. The read address of the video signal supplied from the user memory 3 _n is also
It is processed in the same way.

[0037] In this manner, the read address from the user memory 3 ₁ as shown in FIG. 5 (A), and a read address from the user memory 3 ₂ as shown in (B) of FIG. 5, FIG. 5 User memory 3 _n as shown in (C) of
The read address from is supplied to the cue memory address control unit 13. Then, when there is a requester who needs to send the file head part information signal from the cue memory 14, the corresponding read address is added to the value obtained by subtracting 1 from the memory address of the file, and n
N times sampling is performed with a double clock, and the read address of the file head portion information signal as shown in FIG.
4 is supplied.

This cue memory address control unit 13 is
The read address from each of the user memories 3 ₁ , 3 _2, ... 3 _{n is} sampled n times by the n times sampling section 15, but the address from the user memory which is not requested by the instruction from the memory control section 5 is invalid. Address.

Further, this cue memory address control unit 1
Under the control of the memory control unit 5, the address selector 7 of No. 3 selects the write address from the write address generation unit 16 and supplies it to the cue memory 14, and the file head portion information signal from the device interface 2
That is, the head portion of the video signal is written. The writing of the file head part information signal is performed in advance for all files.

The device control unit 6 accepts the requests from the requesters as described above, instructs the memory control unit 5 to create / update the input / output schedule table as shown in Table 2, and makes a new request or reproduction. The control corresponding to the change request (jump request), the reproduction speed change request, and the stop request is performed. The memory control unit 5 inputs / outputs data to / from the mass storage device unit 1, the device interface 2, the user memory unit 3, and the cue memory unit 4 based on the input / output schedule table created and updated by itself and the reproduction speed change request instruction. And the data selection of the selector 7.

[0041]

[Table 2]

Next, a series of operations of the video signal transmitting device, that is, control from a requester's file request to video transmission and a flow of the video signal will be described with reference to FIGS. 6 to 8.

FIG. 6 is a flow chart showing the control operation of the device control section 6, and FIGS. 7 and 8 are flow charts showing the operation of the memory control section 5.

First, the device control unit 6 creates a request list in which the requester and its files are described in step S1 of FIG.
Read with. Then, the device control section 6 executes the step S2.
Then, communication of the new request read in step S1 is started.

Next, the device control section 6 determines whether or not the acceptance preparation of the memory control section 5 is completed in step S3. If it is determined that the memory controller 5 is ready for acceptance, the device controller 6 proceeds to step S4.
If it is determined that the reception preparation is not completed, the determination in step S3 is repeated until it is determined that the reception preparation is completed.

Next, the device control section 6 which has proceeded to step S4
Determines whether there is a new request, that is, a change request, in the request list read in step S1. If it is determined that there is a new request, the device control section 6 proceeds to step S5, and if it is determined that there is no new request, the processing proceeds to step S13.

Next, the device control section 6 which has proceeded to step S5.
Determines whether the request determined to be a new request in step S4 is a reproduction speed change request. If it is determined that the request is a reproduction speed change request, the process proceeds to step S6. If it is determined that the request is not a new request, the process proceeds to step S7.

The device controller 6 having proceeded to step S6 notifies the memory controller 5 of the requester and the reproduction speed.

The device control unit 6 having proceeded to step S7 determines whether the request determined to be a new request in step S4 is a new request, a jump request, or an abort request. If the device control unit 6 determines that the request is a new request, the process proceeds to step S8. If the device control unit 6 determines that the request is a jump request, the process proceeds to step S9, and if the request is an abort request, the process proceeds to step S10.

Next, the device control section 6 which has proceeded to step S8.
Informs the memory controller 5 of the contents of the new request, that is, the requester and the file. Further, the device control unit 6 having proceeded to step S9 notifies the memory control unit 5 of the jump request, that is, the requester and the change sending position. Further, the device control unit 6 having proceeded to step S10 informs the memory control unit 5 of the content of the cancellation request, that is, the deletion of the requester.

Next, the device control section 6 determines in step S11 and step S12 whether or not there is another request. That is, the device control unit 6 determines whether or not the number n obtained by subtracting 1 from the number N of the request list read in step S1 is greater than 0, and whether or not there is another request. is doing. If it is determined that n is greater than 0, it means that there is another request, and step S5
Repeat the process from. On the other hand, if it is determined that n is not greater than 0, it means that there is no other request, and the process proceeds to step S13.

Next, in step S13, the device controller 6
In response to the determination result of the above step S4 or S12, notifies the end of the change processing to the memory control unit 5, and determines whether or not the completion confirmation is performed by the memory control unit 5 in step S14. Here, if there is a completion confirmation from the memory control unit 5, the processing from step S1 is newly repeated.
The completion confirmation determination in step S14 is repeated until the completion confirmation is obtained, and the processing from the new step S1 is stopped during this period.

For example, when the device control unit 6 notifies the memory control unit 5 of the request by the above-described processing, the memory control unit 5 performs the processing shown in FIGS. 7 and 8 below.

First, the memory control unit 5 waits for communication from the device control unit 6 in step S21 of FIG. This is Figure 6
This is the process corresponding to step S2. Next, the memory control unit 5 notifies the device control unit 6 of the completion of preparation for accepting the change in step S22. This corresponds to step S3 in FIG. Then, the memory control unit 6 returns the user pointer of the input / output schedule table shown in Table 2 to the head in step S23.

Next, the memory control unit 5 determines whether or not there is a change request from the device control unit 6 in step S24. If it is determined that there is a change request, the memory control unit 5 proceeds to step S25, and if it is determined that there is no change request, the memory control unit 5 proceeds to step S29.

Next, the memory control unit 5 having proceeded to step S25 determines whether the change request is a new request, a jump request, a delete request, or a reproduction speed change request. If it is determined that the request is a new request, the memory control unit 5 proceeds to step S26,
For example, a new request for file T _A of requester H ₈ is added to the last part of the I / O schedule table as shown in Table 2. If it is determined here that the request is a jump request / reproduction speed change request, the process proceeds to step S27,
Make table changes. This table change is performed by changing the address to change the order to the fastest read position or when there is no requester number in the remaining part in one cycle. Furthermore, this is done by adding the reading of the next block to the end of the table. If it is determined that the request is a deletion request, the process advances to step S28 to delete the request corresponding to the deletion request from the input / output schedule table.

When the processing of the above step S26, step S27 or step S28 is completed, the memory control section 5 advances to step S29 to notify the device control section 6 of the completion of the table preparation. If there is no requester in the table created here, the memory control unit 5 returns to step S21 via step S30.

Next, the memory controller 5 proceeds to step S31.
Table 2 created by the processing up to step S30 above
The mass storage unit 1 is instructed to read the block of the requested file based on the input / output schedule table shown in FIG. In addition, in step S31, the memory control unit 5 instructs the user memory unit 3 to load the block output from the mass storage device unit 1 via the device interface 2.

The user memory address controller 12 writes a block of a file in the memory 10 according to the content of the request. When the memory 10 is full, writing is switched to the memory 11. Then, the writing is switched alternately until all the blocks of the file image are exhausted.

Next, the memory control section 5 executes step S31.
In step S32 of FIG. 8, it is determined whether the instruction issued in step S32 is a new request for the file of the new requester. If it is a new request, the process proceeds to step S33 and Notify new file. Then, the memory control unit 5 switches the selector in the selection unit 7 for the new requester to the cue memory unit 4 side.

Next, in step S34, the memory control unit 5 increases the read address of the block of the mass storage device unit 1 by the block. After the processing for the new requester, the presence / absence of a block remaining is confirmed in step S35. If there is a block remaining, the process proceeds to step S36 to increment the user pointer by one. On the other hand, when there is no block remaining, the process proceeds to step S37 and the change request is deleted from the table.

When the process of step S36 or step S37 is completed, the process returns to step S24 of FIG.

As described above, the video signal transmitting apparatus operates under the control of the apparatus control section 6 and the memory control section 5 in response to a new request, a jump request, a reproduction speed change request and a stop request from the requester. I do.

The video signal recording operation of this embodiment will be described below.
The reproduction operation for the reproduction speed change request will be described with reference to FIGS.

First, the recording operation will be described.

The mass storage device section 1 is operated via the selector 24.
Video signal supplied from the device interface 2
To the write address generated by the address generator 34
Therefore, the data is written in the buffer memory 31. Buffer memory
31 has a certain amount of data such as 30 frames
Is stored, it is supplied from the device interface 2
The video signal to be written is similarly written in the buffer memory 32.
Get caught. During this time, the buffer memory 31 reads the address.
Video according to the read address generated by the video generator 33
The signal is read. These two buffer memories 31 and
The write and read operations of 32 and 32 are alternately repeated.
It In the case of recording such data, the address generator 3
3 is a read address and the address generator 34 is a write
Generate an embedded address. In addition, writing is a frame
Alternatively, 30 frames are read in the order of fields.
Corresponding pixel order. And 30 frames
30 pixels from the collection and delivery controller 22₁, 22
_Two, 22_Three... 22₂₉, 22_ThirtyIs 30 each
Disk device 10 with 30 units installed₁, 10_Two, 10 _Three・
・ ・ 10₂₉, 10_ThirtyTo complete the recording operation.
It

Next, the reproducing operation will be described.

In the following, normal reproduction, double speed reproduction, 3
The case where there is a request for double speed reproduction and 30 times reproduction will be described.

First, when the reproduction speed requested by the requester to the device control unit 6 is normal, 30 disk devices 1
0 _{1, 10 2,} 10 3, ... _{10 29,} video signals from the _{10 30} 30 pixels by collecting and distributing controller ₂₂ 1, 2
2 ₂ , 22 ₃ ... 22 ₂₉ , 22 ₃₀ are taken in,
Dividing / combining units 23 ₁ , 23 ₂ , 23 ₃ ... 23 ₂₉ ,
23 ₃₀ is written to the buffer memory. For example, in the case of the division / synthesis unit 23 ₁ , the data is written in the buffer memory 31. The writing is reconstructed into a 30-frame video according to the address of the address generator 33. When the image for 30 frames is formed, the writing is performed in the buffer memory 32, and the data is read from the buffer memory 31. The write / read operations of the two buffer memories 31 and 32 are alternately repeated. In the case of such data reproduction, the address generator 33 generates a write address and the address generator 34 generates a read address. Here, when the video is reconstructed in the buffer memories 31 and 32, if some data causes insufficient data, the interpolating unit 35 reads the frames before and after the insufficient data from the buffer memories 31 and 32, and outputs the insufficient data. Interpolation is performed to generate interpolation data, and the interpolation data is returned to the buffer memories 31 and 32. Memory controller 5
Supplies a timing signal, an address generation control signal, a buffer memory control signal, an interpolation control signal to the interpolator 35,
Performing interpolation control of the interpolation control the divider / combiner unit 23 _1. As described above, in the case of normal reproduction, as shown in FIG. 9, 30 disk devices 10 ₁ , 10 ₂ , 10 ₃ ... 10 ₂₉ ,
From 10 ₃₀ to the buffer memories 31 and 32, the frame data (F1, F2, F3, F4, F5, ...
7, F28, F29, and F30) are read in the same amount to generate continuous data of 30 frames / sec. In FIG. 9, "1" shown between each disk device and the buffer memory indicates a normalized transfer rate with 1 in the normal case.

Next, a case where the reproduction speed requested by the requester to the apparatus control unit 6 is double speed will be described with reference to FIG.

When this request for double-speed reproduction is supplied to the device control section 6, the disk array section 10 causes every other disk device, for example, the disk devices 10 ₁ , 10 ₃ , 10 _5.
... The frame data that is twice as large as that in the normal reproduction is read from a total of 15 units of 10 ₂₇ and 10 ₂₉ , and continuous data of 30 frames / sec is generated.

Next, when the device controller 6 is requested to perform the 3 × speed reproduction, the disk array unit 10 causes every two disk devices, for example, one disk device to be read, as shown in FIG.
0 ₁ , 10 ₄ , 10 ₇ ... 10 ₂₈ , 10 times in total, read out three times as much frame data as in normal reproduction, and 3
Continuous data of 0 frame / second is generated.

Next, when the device control section 6 is requested to perform 30 × speed reproduction, the disk array section 10 causes the disk array section 10, for example, a disk apparatus 1 such as the disk apparatus 1 as shown in FIG.
0 ₁ and only one, read 30 times of the frame data when the normal reproduction, produces a continuous data 30 frames / sec.

Generally, at the time of n-times speed reproduction, every n-1 disk units are used. The n-1th disk device is a device in which the nth disk device is sequentially selected from the arbitrary disk devices.

In practice, as described above, the disk device 1
Access to 0 ₁ , 10 ₂ , 10 _3, ... 10 _{2 9} , 10 ₃₀ may be concentrated. The specific operation of this embodiment when access is concentrated will be described below.

For example, the number of users for the video signal transmitting apparatus of this embodiment is 30, and the transfer rate of 1 file video is 3.
0 Mbps, the maximum transfer rate of one disk device is 40
Assume Mbps.

Here, when one user requests 30x speed and the remaining 29 request normal reproduction, the data transfer rate required in this embodiment is 29 people × 1 Mbps + 1.
The number of persons (30 times speed request) × 30 Mbps = 59 Mbps, and data for 19 persons or 19 Mbps is insufficient. For this reason, the division / composition unit of this embodiment is 19 Mbp.
The missing data of s is generated by interpolation.

Two users requesting 15x speed and the remaining 2
When 8 persons request normal reproduction, the data transfer rate required by this embodiment is 28 persons × 1 Mbps + 1 person (15 times speed request) × 15 Mbps = 43 Mbps, and data for 3 persons or 3 Mbps is insufficient. . Therefore, the division / synthesis unit of the present embodiment generates the insufficient data of 3 Mbps by interpolation.

There are 12 users who request triple speed and the remaining one is 1.
When 8 persons request normal reproduction, the data transfer rate required by this embodiment is 18 persons × 1 Mbps + 4 persons (three times speed request) × 3 Mbps = 30 Mbps, which is 4
Since it is 0 Mbps or less, interpolation is unnecessary.

If the number of users requesting 30x speed is 30, the data transfer rate required by this embodiment is 1 (3
0x speed request) × 30 Mbps = 30 Mbps and 4
Since it is 0 Mbps, interpolation is unnecessary.

As described above, in the video signal transmitting apparatus according to the present embodiment, even if the requester requests the apparatus control unit to change the reproduction speed, for example, the n-times speed reproduction, the mass storage units 1 to n can be used.
The video signal can be reproduced as continuous video at 30 frames / second at frame intervals.

The data recording / reproducing apparatus according to the present invention is not limited to being applied only to the mass storage unit of the video signal transmitting apparatus of the above-mentioned embodiment. For example, the number of disk devices is 30 or more. Alternatively, it can be applied to the following mass storage device section. Further, it can be applied not only to a video signal transmission device for transmitting a video signal, but also to an audio signal transmission device for transmitting audio data and a mass storage device section of a character information transmission device for transmitting character information data. Furthermore, when the reproducible double speed exceeds 30 times, for example, 60
The speed is 15 frames / second at double speed and 10 frames / second at 90 times speed.

[0083]

The data recording / reproducing apparatus according to the present invention realizes n-times speed reproduction by reading video data from each hard disk device every (n-1) units using the reproducing means. It can respond to special playback requests and can easily change the playback speed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a configuration of a preferred embodiment to which a data recording / reproducing apparatus according to the present invention can be applied.

2 is a block diagram showing an example of a configuration of a mass storage device section 1 shown in FIG.

FIG. 3 is a block diagram showing an example of a configuration of a division / synthesis unit of the mass storage device unit 1 shown in FIG.

FIG. 4 is a block diagram showing an example of a configuration of a user memory unit and a cue memory unit of the embodiment shown in FIG.

FIG. 5 is a timing chart for explaining the operation of the cue memory unit shown in the figure.

FIG. 6 is a timing chart showing the processing of the device control unit of the embodiment.

FIG. 7 is a timing chart showing the processing of the memory control unit according to the embodiment.

FIG. 8 is a timing chart showing the processing of the memory control unit according to the embodiment.

FIG. 9 is a diagram for explaining the operation of the embodiment during normal reproduction.

FIG. 10 is a diagram for explaining the operation of the embodiment during double speed reproduction.

FIG. 11 is a diagram for explaining the operation of the embodiment during 3 × speed reproduction.

FIG. 12 is a diagram for explaining the operation of the embodiment during 30 × speed reproduction.

FIG. 13 is a diagram for explaining a method of reading data from the disk array unit.

[Explanation of symbols]

1 mass storage device unit, 2 device interface, 3 user memory unit, 4 cue memory unit, 5 memory control unit, 6 device control unit, 7 selection unit, 10 disk array unit, 20 disk array control unit

Claims (3)

(57) [Claims] 1. A data recording / reproducing apparatus for recording / reproducing data including video and / or audio data on a disk array composed of a plurality of hard disk devices, wherein each field or frame of the inputted video data is the field or N frames are input in the frame input order.
A recording means for recording the data so that the data is circulated in the hard disk device, and a reproduction for reading out the video data from the hard disk device every (n-1) units when reproduction at n times speed is requested. And a data recording / reproducing apparatus. 2. The data recording / reproducing according to claim 1, wherein when the n-times speed reproduction is requested, the reproducing means reads out n times as much data from each of the hard disk devices as compared with the 1 times speed reproduction. apparatus. 3. The reproduction means, when the data cannot be read from the hard disk device by the n-fold speed reproduction , cannot read the data.
2. The data recording / reproducing apparatus according to claim 1, further comprising an interpolating unit that interpolates and outputs the unreadable data from the data of the field or the frame before and after .