JPH07184164A - Video signal recorder and video signal reproducing device - Google Patents

Abstract

PURPOSE:To relieve a mechanical load with respect to seeking by realizing double speed reproduction by similar head operation and number of revolutions to those at standard reproduction. CONSTITUTION:A disk array section 10 other than multiples of 2 and 3 such as 7 sets of magneto-optical disk devices are arranged in parallel records sequentially video signals divided in the unit of frames while sharing the signals to the magneto-optical disk devices. Then the video signal read from the disk array section 10 comprising the 7 sets of the magneto-optical disk devices is read by the control of a disk controller 24 and selected by a 2nd multiplexer and written in a buffer memory section 22. The video signal read from the buffer memory section 22 is selected by a 1st multiplexer 21 and fed to an input output interface 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal recording apparatus for recording a video signal in a disk array section which is a large-capacity storage medium and a video signal reproducing apparatus for reading the video signal from the disk array section.

[0002]

2. Description of the Related Art In recent years, an information signal recording / reproducing apparatus for recording and reproducing information data such as a video signal, an audio signal or a character signal has a storage capacity for recording the information data and a transfer rate. In order to improve the 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. A characteristic of recording in this disk array device is that the input information data is distributed, interleaved, and stored in a plurality of disk-shaped recording media 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 Inexpesive Di
skes), which is divided into five levels from RAID1 to RAID5 as shown in Table 1 below, based on reliability, interleaving, storage of error correction codes, and operational characteristics.

[0004]

[Table 1]

RAID 1 is a disk D in which information data shown in FIG. 7A is duplicated as shown in FIG. 7B.
1 and the disc D2 are recorded to improve reliability. This duplicated disc is called a mirrored disc, and is not interleaved and has no error correction code.

The RAID2 interleaves the information data shown in FIG. 7A in bit units as shown in FIG. 7C, and the disks D1, D2 and D3 are interleaved.
And disc D4. Further, the error correction code which is a Hamming code is stored in the dedicated disks D5 and D6. The error correction code is stored in the plurality of dedicated disks D5 and D6 because the error correction code is a Hamming code.

In RAID 3, the information data shown in FIG. 7A is interleaved in bit units as shown in FIG. 7D, 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. This RAID3 is RAID2
Together, it improves reliability and data transfer rate.

The RAID4 interleaves the data shown in FIG. 7A in sector units as shown in FIG. 7E and stores it in four disks D1, D2, D3 and D4. is doing. Also,
Dedicated disk D for error correction code that is a parity code
Stored in 5. 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. 7A is interleaved in sector units as shown in FIG. 7F, and the five disks D1, D2, D3, D4 and D5 are interleaved. Stored on disk. Error correction codes, which are parity codes, are distributed and stored in each disk. Since this RAID 5 also stores data by performing interleaving on a sector-by-sector basis, high-speed reading is possible by random access.

Therefore, the information data recording / reproducing apparatus using the RAID 2 and RAID 3 disk array apparatuses is
Since the disk array devices of IDs 2 and 3 interleave information data in bit units, they are suitable for normal reproduction such as continuous data reading at high speed. But,
These RAIDs 2 and 3 do not have a random access function for reading out continuous data in an intermittent manner, and therefore are not suitable for high speed reproduction.

On the other hand, the information data recording / reproducing apparatus using the disk array devices of RAID 4 and 5 is
Since the disk array devices 5 and 5 interleave the information data in sector units, the disk array device is suitable for high-speed reproduction in which scattered data is read at high speed. However, depending on the speed of the high speed reproduction, the size of the sector cannot be determined, or the access is concentrated on the disc for treatment.

That is, when a disk array device such as RAID 2 and 3 is used, an information data reproducing device excellent in improving the data transfer rate is used, and when a disk array device such as RAID 4 and 5 is used, individual disks are arranged in parallel. It is possible to provide an information data reproducing device which is excellent in parallel read / write operation such that it is operated in parallel.

Here, the information data is video data,
In a video signal recording / reproducing apparatus that records / reproduces this video data, it is important to improve the data transfer rate, and therefore disk array apparatuses such as RAID 2 and 3 are used.

[0014]

By the way, in the video signal recording / reproducing apparatus, high-speed reproduction is often performed in addition to normal reproduction. Therefore, the random access function is required for the RAID 2 and RAID 3 disk array devices.

Since the disk array devices of RAID 2 and 3 do not have the random access function as described above, they are not suitable for high speed reproduction, and it becomes difficult to read video data efficiently during high speed reproduction.

For example, the reproduction at the double speed is performed in RAID 2 and 3
When using the disk array device described above, even if an attempt is made to read video data at the same speed as during normal reproduction, half of that data is unnecessary, so the reading speed will be half that during normal reproduction. I will end up.

Therefore, when high speed reproduction is performed using the RAID 2 and 3 disk array devices, the rotation speed of the disk is doubled, or a buffer memory is newly prepared so that video data on the disk can be recorded. It is conceivable to scan zigzag and rearrange in the buffer memory later.

However, in that case, it is necessary to seek the head portion for every other video data, the mechanical load on the seek is large, and the amount of data is reduced by the time spent for the seek time. It happens that the video data cannot be read.

The present invention has been made in view of the above circumstances, and it is possible to efficiently perform double speed reproduction and fast feed.
An object of the present invention is to provide a video signal recording device and a video signal reproducing device that can reduce mechanical load on seek.

[0020]

A video signal recording apparatus according to the present invention is a video signal recording apparatus capable of simultaneously recording on a plurality of disk devices constituting a disk array section, and the video signal recording apparatus constituting the disk array section. The problem is solved by setting the number of disk devices to be n other than a multiple of 2 and 3 and sequentially distributing and recording the video signals divided in frame or field units to the n disk devices. Here, when the number n of the disk devices configuring the disk array unit is other than a multiple of 2 and 3, the number n is neither a multiple of 2 nor a multiple of 3, for example, 5, 7, 11, 1.
3, 17, 19 ... Also,
The video signals are sequentially distributed and recorded to the n disk devices, that is, the video signals are distributed to the respective disk devices of the n disk devices in a fixed order, and the video signals are cyclically distributed every n frames or n fields. It is to repeat.

The video signal reproducing apparatus according to the present invention is
A video signal reproducing apparatus for reproducing a video signal recorded by sequentially distributing video signals divided in frame or field units to a disk array unit composed of disk devices other than multiples of 2 and 3 In the case of reproducing the above-mentioned video signal at n-times speed, the video signals at n-frame or n-field intervals are reproduced in parallel from each disk and transferred to the buffer memory. The above problem is solved by obtaining a video signal.

[0022]

Since the video signals divided in units of frames or fields are sequentially distributed and recorded in the disk array section configured with the number of disk devices other than multiples of 2 and 3, multiple speeds of multiples of 2 and multiples of 3 For example, a video signal of a frame or field required for reproduction at 2 × speed, 3 × speed, 4 × speed, 6 × speed, etc. can be simultaneously taken out from all of the plurality of disk devices.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments to which the video signal recording apparatus and the video signal reproducing apparatus according to the present invention can be applied will be described below with reference to the drawings. In this embodiment, as shown in FIG. 1, a magneto-optical disk device is arranged in parallel, for example, a disk array unit 10 having a number other than a multiple of 2 and 3, for example, and recording / reading of a video signal in the disk array unit 10 is controlled. The disk array control unit 20 and the input / output interface 30 for supplying the video signal to the disk array control unit 20 and outputting the video signal.

The disk array control unit 20 selects a video signal via the input / output interface 30 and a buffer memory unit for temporarily recording and outputting the video signal via the first multiplexer 21. 22 and the video signal transmitted through the buffer memory unit 22 to the respective disks D1, D2 ... D of the disk array unit 10.
Second multiplexer 23 for selectively arranging 6 and D7, and each disk D1 of the disk array unit 10.
The disk controller 24 controls the D2, ..., D6 and D7.

Here, the buffer memory unit 22 has a double buffer structure. First buffer memory 22a
While the data is being written to the second buffer memory 22b, the data is read from the second buffer memory 22b. Conversely, while the data is being read from the first buffer memory 22a, the second buffer memory 22b is read. Data is written in the memory 22b. As described above, the structure is such that writing and reading are alternately switched and writing and reading can be performed continuously.

Input video data via the input / output interface 30 is written in the disk array unit 10 by the disk array control unit 20. At this time, in the video signal recording / reproducing apparatus of this embodiment, the number of disk drives constituting the disk array unit 10 is set to 7 other than a multiple of 2 and 3, and the video signal divided in frame units is set to 7
The data is sequentially distributed and recorded on the one disk device D1, D2, ... D6 and D7.

In this embodiment, the video signal read from the disk array unit 10 composed of seven disk devices is read by the control of the disk controller 24, selected by the second multiplexer and selected by the buffer memory unit 22. Write in. The video signal read from the buffer memory unit 22 is selected by the first multiplexer 21 and supplied to the input / output interface 30.

Here, in reproducing the video signal recorded in the disk array unit 10, standard reproduction having a reproduction speed as a standard is generally used, but double speed reproduction, triple speed reproduction, quadruple speed reproduction, 5 Double speed reproduction must be taken into consideration.

The details of the operation of the video signal recording / reproducing apparatus of this embodiment will be described below with reference to FIGS.

In the present embodiment, as shown in FIG. 2, the number of disk drives constituting the disk array device is set to, for example, 7 other than a multiple of 2 and 3, and the video signal divided in frame units is divided into seven disk devices D1, D2, D3, D4, D
5, D6 and D7 are sequentially sorted and recorded. The sequential allocation recording in this case means that the disk array controller divides the input video data through the input / output interface into frame units, and the seven disk devices D1, D2, D3, D4, D5 and D6 are divided into frame units. And D7. That is, as shown in FIG. 2, input video data divided in frame units are recorded in parallel, such as the frame F1 on the disc D1, the frame F2 on the disc D2, and the frame F3 on the disc D3. Therefore, for example, on the disc D1, the frame F1, the frame F8, the frame F15, ...
-In this way, the input video data is recorded at 7-frame intervals.

A case where reproduction is performed at various reproduction speeds in this embodiment, in which the input video data is distributed and recorded sequentially in units of frames in this manner, will be described below.

First, the standard reproduction will be described with reference to FIG. In this case, the disk array controller 20
Frames F1 to F7 recorded on the disks D1 to D7 by the disk controller 24
The video data up to the frame is read from the disks D1 to D7 and stored in the predetermined areas A1 to A7 of the first buffer memory 22a of the buffer memory unit 22 selected by the second multiplexer 23. When this fetching is completed, the first multiplexer 21 from the first buffer memory 22a of the buffer memory unit 22.
The video data of the frames F1 to F7 is transmitted according to. During this period, the video data of the frames F8 to F14 recorded on the disks D1 to D7 are stored in the second buffer memory 22b of the buffer memory unit 22. Then, by repeating such operations alternately, the frame-by-frame image data recorded in the disk array unit 10 is sequentially standard-reproduced.

Next, double speed reproduction will be described with reference to FIG. In this case, the disk array controller 20
Is a frame F8 recorded on the disc D1, a frame F2 recorded on the disc D2, and a disc D3.
The frame F10 recorded on the disc D4, the frame F4 recorded on the disc D4, the frame F12 recorded on the disc D5, the frame F6 recorded on the disc D6, and the frame F recorded on the disc D7.
The video data of 14 frame units is read from the disks D1 to D7, and the first buffer memory 22 of the buffer memory unit 22 selected by the multiplexer is read.
It is stored in the predetermined areas A1 to A7 of a. When this capture is completed, the video data of each frame unit in the first buffer memory 22 is selectively rearranged by the multiplexer 2 and transmitted in the order of frame F2, frame F4, frame F6, frame F8, frame F14. To be done. During this period, the frame F22 recorded on the disc D1 and the frame F recorded on the disc D2
16, a frame F24 recorded on the disc D3,
Frame F18 recorded on disk D4, frame F26 recorded on disk D5, disk D6
The video data of the frame F20 recorded on the disk F7 and the frame F28 recorded on the disk D7 are stored in the second buffer memory 22b. Then, after being selectively rearranged by the first multiplexer, the frame F
16, frame F18, frame F20, frame F2
2, frame F24, frame F26, frame F28
Are sent in that order. By repeating such an operation alternately, the frame-by-frame video data recorded in the disk array unit 10 is sequentially reproduced at double speed.

Next, the triple speed reproduction will be described with reference to FIG. In this case, the disk array controller 20
Indicates a frame F15 recorded on the disc D1, a frame F9 recorded on the disc D2, and a disc D.
Frame F3 recorded on disc 3, frame F18 recorded on disc D4, frame F12 recorded on disc D5, frame F6 recorded on disc D6, and frame F21 recorded on disc D7 The unit video data is recorded on the disc D1 to
Read from disk D7, second multiplexer 23
The data is stored in predetermined areas A1 to A7 of the first buffer memory 22a selected by. When this fetching is completed, the video data of each frame unit in the first buffer memory 22a is selectively rearranged by the first multiplexer 21 and the frames F3, F6, F9, F12, F15, The frames F18 and F21 are transmitted in this order. During this period, a frame F36 recorded on the disc D1, a frame F30 recorded on the disc D2, a frame F24 recorded on the disc D3, a frame F39 recorded on the disc D4, and a frame recorded on the disc D5. The video data of F33, frame F27 recorded on the disk D6 and frame F42 recorded on the disk D7 are stored in the second buffer memory 22.
stored in b. Then, it is selectively rearranged by the multiplexer 2, and the frames F24, F27,
The frames F30, F33, F36, F39, and F42 are transmitted in this order. By repeating such operations alternately, the frame-by-frame video data recorded in the disk array unit 10 is sequentially reproduced at a triple speed.

Next, quadruple speed reproduction will be described with reference to FIG. In this case, the disk array controller 20
Indicates a frame F8 recorded on the disc D1, a frame F16 recorded on the disc D2, and a disc D.
Frame F24 recorded on disc 3, frame F4 recorded on disc D4, frame F12 recorded on disc D5, frame F20 recorded on disc D6, and frame F28 recorded on disc D7 The video data of the unit is the disc D1
~ Read from disk D7, second multiplexer 2
The data is stored in the first buffer memory 22a selected by 3. When this fetching is completed, the video data of each frame unit in the first buffer memory 22a is selectively rearranged by the multiplexer 2 and the frame F
4, frame F8, frame F12, frame F16,
The frame F20, the frame F24, and the frame F28 are transmitted in this order. During this period, a frame F36 recorded on the disc D1, a frame F44 recorded on the disc D2, a frame F52 recorded on the disc D3, and a frame F3 recorded on the disc D4.
2. The video data of the frame F40 recorded on the disc D5, the frame F48 recorded on the disc D6 and the frame F56 recorded on the disc D7 are stored in a predetermined area of the second buffer memory 22b. Then, it is selectively rearranged by the multiplexer 2, and the frame F32, the frame F36, and the frame F4 are rearranged.
0, frame F44, frame F48, frame F5
2, the frame F56 is transmitted in this order. By repeating such an operation alternately, the frame-by-frame image data recorded in the disk array device is sequentially reproduced at 4 × speed.

Next, quintuple speed reproduction will be described with reference to FIG. In this case, the disk array controller 20
Is a frame F15 recorded on the disc D1, a frame F30 recorded on the disc D2, a frame F10 recorded on the disc D3, a frame F25 recorded on the disc D4, and a frame recorded on the disc D5. F5, the frame F20 recorded on the disc D6 and the frame F35 recorded on the disc D7 are transferred to the disc D as frame unit video data.
1 to read from the disk D7 and store in the predetermined areas A1 to A7 of the first buffer memory 22a selected by the second multiplexer 23. When this fetching is completed, the video data of each frame unit in the first buffer memory 22a is selectively rearranged by the first multiplexer 21 and the frame F5, the frame F10,
The frame F15, the frame F20, the frame F25, the frame F30, and the frame F35 are transmitted in this order. During this period, the frame F recorded on the disc D1
50, a frame F65 recorded on the disc D2,
Frame F45 recorded on disk D3, frame F60 recorded on disk D4, disk D5
The video data of the frame F40 recorded on the disk F6, the frame F55 recorded on the disk D6, and the frame F70 recorded on the disk D7 are stored in the second buffer memory 22b. Then, it is selectively rearranged by the multiplexer 2, and the frame F40, the frame F45, the frame F50, the frame F55, the frame F
60, a frame F65, and a frame F70 are transmitted in this order. By repeating such an operation alternately, the frame-by-frame video data recorded in the disk array device is sequentially reproduced at 5 × speed.

From the above, in the video signal recording / reproducing apparatus of the present embodiment, the number of disk drives constituting the disk array section is set to 7 other than a multiple of 2 and 3, and the video signal divided in frame units is set to 7 disk devices. When sequentially recording and distributing these video signals to n times speed reproduction,
Video signals at intervals of n frames are reproduced in parallel from each of the disks D1 to D7 of the disk array unit 10 via the disk controller 24 and the second multiplexer 23 and transferred to the buffer memory unit 22, and the buffer memory unit 22 outputs the first signal. Since the video signal of the n-times speed frame is sent to the input / output interface 30 via the multiplexer 21, the double-speed reproduction and the fast-forwarding can be efficiently performed. That is, since the double speed reproduction can be realized with the same head operation and rotation speed as in the standard reproduction, the mechanical load on the seek can be reduced.

However, in the case of this embodiment, the number of disks in the disk array unit 10 is 7, so 7 × speed or 14
It is not possible to perform a double speed reproduction of a multiple of 7 as in the double speed.

The video signal recording apparatus and the video signal reproducing apparatus according to the present invention are not limited to the above-mentioned embodiments, and the disk array section may be composed of five disk devices, for example. In this case, 2 ×, 3 ×, and 4 × speed reproduction can be realized. That is, according to the required specifications, the number of disks arranged in the disk array section is not a multiple of 2 and 3, that is, a number other than a multiple of 2 or a multiple of 3, specifically, 5, 7, 1.
You can select 1, 13, 17, 19 ...

Further, in the video signal recording / reproducing apparatus of the embodiment, for example, in the case of triple speed reproduction, the frame F3
The frame F6, the frame F9, the frame F12, ... Are reproduced, but the frame F2, the frame F5, and the like are reproduced.
The frames F8, F11, ... May be reproduced. The same applies to the case of 2 × speed reproduction, 4 × speed reproduction, and 5 × speed reproduction.

Further, the disk constituting the disk array section is not limited to the magneto-optical disk, but the disk array section may be constituted only by an optical disk such as a compact disk and only the reproduction is performed. Good. Further, the present invention can be applied to a case where a magnetic disk is used and the data on the magnetic disk is skipped and read.

The video signal recording device and the video signal reproducing device according to the present invention may record and reproduce the video signal in field units.

[0043]

In the video signal recording apparatus and the video signal reproducing apparatus according to the present invention, the video signal is recorded in units of frames or fields on each disk of the disk array section configured so that the number of disk drives is not a multiple of 2 and 3. When dividing and sequentially recording and recording this video signal at n times speed, n frames or n field interval video signals are reproduced in parallel from each disk and transferred to a buffer memory, and the n times speed is used from this buffer memory. Since the video signal of the frame or field is obtained, double speed reproduction and fast forwarding can be efficiently performed. That is, since double speed reproduction can be realized with the same head operation and rotation speed as in standard reproduction,
The mechanical load for seeking can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a preferred embodiment of a video signal recording device and a video signal reproducing device according to the present invention.

FIG. 2 is a diagram for explaining an operation when standard playback is performed in the embodiment shown in FIG.

FIG. 3 is a diagram for explaining an operation in the case of performing double speed reproduction in the embodiment shown in FIG.

FIG. 4 is a diagram for explaining an operation when performing 3 × speed reproduction in the embodiment shown in FIG.

FIG. 5 is a diagram for explaining an operation when quadruple speed reproduction is performed in the embodiment shown in FIG.

FIG. 6 is a diagram for explaining an operation when performing 5 × speed reproduction in the embodiment shown in FIG.

FIG. 7 is a diagram for explaining a disk array unit.

[Explanation of symbols]

 10 ... Disk array section 20 ... Disk array control section 21 ... First multiplexer 22 ... Buffer memory section 22a ... First buffer memory 22b ... Second buffer memory 23 ... Second multiplexer 24 ... Disk controller 30 ... Input / output interface

Claims (2)

[Claims] 1. A video signal recording apparatus capable of simultaneously recording on a plurality of disk devices forming a disk array unit, wherein the number of disk devices forming the disk array unit is other than a multiple of 2 and 3, A video signal recording device, wherein a video signal divided in units of frames or fields is sequentially distributed and recorded in the disk device. 2. A video signal recorded by sequentially distributing video signals divided in units of frames or fields to a disk array section composed of disk devices of a number other than a multiple of 2 and 3 and reproducing the video signals. In the case of a video signal reproducing apparatus for reproducing the video signal at an n-fold speed, the video signal at an interval of n frames or n fields is reproduced in parallel from each disk and transferred to a buffer memory. Video signal reproducing apparatus characterized by obtaining the video signal of the frame or the field.