JPH09182016A - Video data recording device, video data reproducing device, and video display device - Google Patents

Abstract

In a multi-screen display device in which a plurality of CRTs are arranged to form a large screen, a playback device is required for each display device, which is problematic in terms of device scale, maintenance, and reliability. .
There was also a demand for repeated reproduction without rewinding work. A plurality of video data input to a video data recording unit for each CRT device 41 _{-1 to} 41 _-n is MPE.
The data encoded by G2 and arranged to be simultaneously displayed are arranged on the data recording medium 20 so as to be easily reproduced at the same time. Since the data recording medium 20 is a disk recording medium, it can be randomly accessed and can be reproduced from any place without rewinding work. The video data recorded on the data recording medium 20 is simultaneously reproduced by the video data reproducing unit 30, separated into each original video data, and decoded, and then each CRT of the video display unit 40.
It is output to the devices 41 _{-1 to} 41 _-n .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video data recording device for recording video data supplied to a multi-screen video display device comprising a plurality of display devices, and reproducing the video data so that the video data can be displayed on the video display device. And a video display device that displays input video data.

[0002]

2. Description of the Related Art For example, there is a multi-screen display device as one of large-sized display devices for displaying an image so that many people can watch it at the time of demonstrating public relations activities such as an exhibition. The multi-screen display device is a display device in which a plurality of display devices are arranged close to each other to form one screen as a whole. Usually 4
In many cases, CRT devices such as 9 units, 16 units, or 16 units are arranged and arranged in a grid pattern in the order of 2 × 2, 3 × 3, and 4 × 4. In such a multi-screen display device, images are displayed so as to form one screen as a whole, independent images are displayed on each display device, or they are combined to mix large and small images. It is possible to effectively display the image by displaying the image.

In such a multi-screen display device, video data displayed on each display device is recorded on different video tapes, and the video tapes are recorded on a plurality of video decks corresponding to the plurality of display devices. Each image is reproduced and a desired image is displayed on each display device. Therefore, the control means provided separately controls the whole, and a synchronizing signal is input to each video deck so that they operate in synchronization.

[0004]

However, in the above-mentioned multi-screen image display device, a video deck for supplying video data to be displayed to each of the plurality of image display devices is required and each There is a problem that a device for generating a sync signal to be input to the VCR and a device for controlling the whole are required, and the device scale becomes complicated and large. In addition, since the VCR has many mechanical components, maintenance is troublesome. Further, there is a demand for reducing the number of mechanical components in terms of reliability. Further, when a video tape is used as a recording medium, the video tape has to be rewound when it is repeatedly reproduced, which causes a problem that the operability is poor.

Therefore, it is an object of the present invention to provide an image display device having a multi-screen structure which can simplify the device structure, improve reliability, and display image data repeatedly. Another object of the present invention is to provide a video data recording device for recording video data to be displayed on the video display device on a recording medium so that the video data can be appropriately supplied to the video display device. . Another object of the present invention is to provide a video data reproducing apparatus for reproducing the recording medium recorded by the video data recording apparatus so that the video data can be appropriately displayed when supplied to the video display means having a multi-screen structure. To provide.

[0006]

In order to solve the above-mentioned problems, video data to be displayed on a plurality of display devices are recorded on one recording medium and can be reproduced by one reproducing device. Further, as the recording medium, recording is performed on a recording device that can be randomly accessed such as a hard magnetic disk (HD).

Therefore, the video data recording apparatus of the present invention stores a randomly accessible recording medium such as a hard magnetic disk or a magneto-optical disk (MO disk) and video data input corresponding to a plurality of video display devices. A plurality of encoding means for compressing each, and each video data respectively compressed by the plurality of compression means, so that video data simultaneously displayed on the plurality of video display devices can be reproduced simultaneously, Recording means for sequentially recording on the recording medium. Preferably, the recording means displays the video data displayed simultaneously on the plurality of video display devices at predetermined time intervals in a predetermined continuous area of the recording medium, thereby displaying the video data simultaneously. Video data is recorded at high speed, that is, simultaneously and reproducibly.

The video data reproducing device of the present invention is a video data reproducing device for supplying video data to a display device having a multi-screen structure having a plurality of video display devices, and is displayed on the plurality of video display devices. From the recording medium in which the video data that is encoded is recorded,
Reproduction means for simultaneously reproducing video data displayed simultaneously on the plurality of video display devices; data selection means for selecting the simultaneously reproduced video data for each of the plurality of video display devices; A plurality of buffer means provided for each video display device for temporarily storing the video data selected for each of the plurality of video display devices, and the video data stored in each buffer means are sequentially decoded, And a plurality of decoding means provided for each video display device for outputting the decoded video data to the corresponding video display device.

Further, in the image display device of the present invention, a plurality of image display means are arranged in a two-dimensional array, and the whole image display device is composed of
A video display device for displaying video on a display device having two screens, wherein a plurality of encoding means for respectively compressing the video data input corresponding to each video display means, and the compressed video data Recording means for recording video data to be displayed simultaneously on a recording medium so that the video data can be reproduced simultaneously; the randomly accessible recording medium on which the video data is recorded; Playback means for simultaneously playing back the video data displayed simultaneously on the video display means, data selection means for selecting the simultaneously played video data for each of the plurality of video display means, and the plurality of A plurality of buffer means provided corresponding to each of the video display means for temporarily storing the video data selected for each video display means, and stored in the buffer means Sequentially decoding image data, and a plurality of decoding means for outputting a corresponding one of said image display means the video data 該復 Goka.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. In the present embodiment, a multi-screen video display system including a video display device, a video data recording device and a video data reproducing device of the present invention will be described. In this multi-screen video display system, four CRT devices are arranged in two rows and two columns in the shape of a "field". Normally, these four devices display images so as to form one screen. is there. The configuration of the multi-screen image display system is shown in FIG. The multi-screen video display system 1 includes a video data recording unit 1
0, a data recording medium 20, a video data reproducing section 30, and a video display section 40.

First, the structure and operation of the video data recording unit 10 and the structure of the data recording medium 20 will be described. FIG. 2 is a block diagram showing the configuration of the video data recording unit 10. The video data recording unit 10 includes n video encoders 11 _{-1 to} 11 _-n corresponding to n-channel video inputs,
It has n buffers 12 _{-1 to} 12 _-n , n buffer control units 13 _{-1 to} 13 _-n , a disk interface 14, a processor 15, and a keyboard 16. Video encoder 11, buffer 12, and buffer control unit 13
Are provided for n input channels, respectively. The number n of channels is the number of CRTs that form a multi-screen.
It corresponds to the number of devices, and in the present embodiment, 4
It is.

First, the configuration of each section will be described. The video encoders 11 _{-1 to} 11 _-n encode the video input from each input channel in real time.
In this embodiment, MPEG2 (Moving Picture)
Encode video data input by high-quality video coding method by coding Experts Group). Also,
In the present embodiment, the video encoder 11 _-i (i
= 1 to n), the coding is performed at a fixed rate.

The buffers 12 _{-1 to} 12 _-n are FIFO type buffers for temporarily storing the data encoded by the video encoders 11 _-i (i = 1 to n) for each channel. The buffer control units 13 _{-1 to} 13 _-n are provided corresponding to the buffers 12 _{-1 to} 12 _-n , respectively, and corresponding buffers 12 _-i based on a control signal from the processor 15.
(I = 1 to n) is controlled. That is, the video encoder 11 _-1 to 11 _-n in the recording to the buffer 12 _-1 to 12 _-n of the encoded data, data that is temporarily recorded in the buffer 12 _-1 to 12 _-n disk interface 14 Control output to. In addition, the buffer control unit 13
_-i (i = 1 to n) informs the processor 15 of the values of the read pointer and the write pointer of the buffer 12 _-i .

The disk interface 14 makes one of the n buffers 12 _{-1 to} 12 _-n one of the buffers 12 _-i (i = 1) which is made readable based on the control signal input from the processor 15. Data is read from the data recording unit 20. At this time, the disk interface 14 transfers or records data by using a predetermined data block as a transfer unit. In this embodiment, the data recording unit 20 is connected to the video data recording unit 10 by the SCSI interface, and the disk interface 14 is SPC (SC).
SI protocol controller).

The processor 15 includes a video data recording section 10
The respective parts are controlled to perform desired operations. Specifically,
Deo encoder 11_-1~ 11_-n, Buffer control unit 13_-1
~ 13_-n, And the first disk interface 14
Periodization, video encoder 11 _-1~ 11_-nEncoding to
Start and stop, buffer control unit 13_-1~ 13_-nDe to
Data transfer instruction, buffer control unit 13_-1~ 13_-nfrom
Acquire read pointer and write pointer,
Buffer 12_-1~ 12_-nCalculation of accumulated data amount of
Processing such as control of the screen interface 14 is performed. What
The flow of these operations will be described later. Keyboard
The mode 16 is for the video data recording unit 10
Is an external input device for setting.

The data recording medium 20 is a recording medium on which video data is actually recorded by the video data recording unit 10, and is a hard magnetic disk device in this embodiment.

Next, the operation of the video data recording section 10 will be described according to the operation of the processor 15 shown in FIG. FIG. 3 is a flowchart showing a control procedure in the processor 15. First, when the video data recording process is started (step S0), the processor 15 causes the video encoders 11 _{-1 to} 11 _-n and the buffer control unit 13 _-1.
~ 13 _-n and the disk interface 14 are initialized (step S1), and the buffer controller 13 _-1
Output a control signal for permitting data writing to the buffers 12 _{-1 to} 12 _-n to the buffers 13 to 13 _-n (step S
2) Wait for a signal indicating the start of video data input from the keyboard 16 (step S3). When the input of video data is started (step S3), the processor 15 instructs the video encoders 11 _{-1 to} 11 _-n to start encoding (step S4). As a result, the video data recording units 1 are sequentially arranged in parallel from n channels.
The video data input to 0 is sequentially encoded by the video encoders 11 _{-1 to} 11 _-n , and the video data is input to the buffer 12 respectively.
_{-1 to} 12 _-n .

The video data encoded and stored in the buffers 12 _{-1 to} 12 _-n are stored in channels ch1 to chn.
The data is recorded on the data recording medium 20 by a predetermined amount in this order. That is, the processor 15 first selects the channel ch1 (step S5), and the amount of data accumulated in the buffer 12 _-1 becomes a predetermined amount or more based on the signal input from the buffer control unit 13 _-1 . (Step S6).
When the data amount in the buffer 12 _-1 exceeds a predetermined amount, the data accumulated in the buffer 12 _-1 is transferred to the data recording medium 20.
As shown in FIG.
3 _-1 and the disk interface 14 are controlled (step S7). As a result, the data accumulated in the buffer 12 _-1 is recorded on the data recording medium 20 via the disc interface 14. This step S
The processing of 5 to step S7 is sequentially performed for ch1 to chn. That is, it is detected whether or not the selected channel is chn (step S8), and if the channel is chn or less, the next channel is sequentially selected (step S8).
5), steps S6 and S7 are repeated.

If the selected channel is chn (step S8), it is checked whether or not a recording stop signal is input (step S9). If the signal is not input, the channel is re-established. The processes of steps S5 to S8 are repeated for ch1 to chn.
If the recording stop signal is input in step S9, a control signal for ending the encoding is output to the video encoders 11 _{-1 to} 11 _-n (step S10),
A series of processing is ended (step S11).

As a result of such an operation, the data recording medium 2
In a predetermined recording area of 0, n channels of video data are sequentially recorded in the order shown in FIG. That is, ch1 is recorded in the continuous recording area of the data recording medium 20.
For each of the simultaneously reproduced data of chn to chn, the data of ch1 to chn is recorded in the order of being sequentially reproduced.

In the video data recording unit 10, data is written in and read out from the buffer 12 _-i (i = 1 to n) so that the relation of Expression 1 is established. In the equation 1, the recording time of the predetermined unit data in the buffer 12 _-i (i = ₁ to n) is t ₁ , and the data transfer time from the same unit data buffer 12 _-i to the data recording medium 20 is t ₂ , disk interface 14
The switching time of the data acquisition buffer at is t _c , and n is the number of channels.

[0022]

## EQU1 ## t ₁ ≧ n × (t ₂ + t _c ) ... (1)

The time t₁Of the video encoder 11
Determined by compression rate, time t _TwoIs a data recording medium
Determined by the transfer rate of 20 and the time t_cIs a disk
Determined by switching speed at interface 14
You. Therefore, in order to increase the number of channels n,
Time t₁To increase (compression rate is increased and image quality is decreased)
), Time t_TwoTo a smaller value (the transfer rate to the recording medium
Increase), time t_cDecrease (switch channel
It is necessary to use a disk I / F with few over heads)
It becomes important.

Next, the structure and operation of the video data reproducing section 30 and the structure of the video display section 40 will be described.
FIG. 5 is a block diagram showing the configuration of the video data reproducing unit 30. The video data reproducing unit 30 includes n buffers 32 _{-1 to} 32 _-n corresponding to the number n of CRT devices of the interface unit 31 and the video display unit 40, n buffer control units 33 _{-1 to} 33 _-n , n video decoders 34 _{-1 to} 3
4- _n , processor 35 and keyboard 36.
It should be noted that it is assumed that the video data recording unit 10 described above records video data as shown in FIG. 4 on the data recording medium 20.

First, the configuration of each part will be described. The interface unit 31 sequentially reads the video data recorded on the data recording medium 20 based on the control signal input from the processor 35, and further reads the series of read data based on the switching signal input from the processor 35. The video data is separated into video data for each channel and sequentially output to the buffers 32 _{-1 to} 32 _-n . Like the disk interface 14, the interface unit 31 also transfers data to and from the data recording unit 20 connected by the SCSI interface.
It is a protocol controller) and also reads data by using a predetermined data block as a transfer unit.

The buffers 32 _{-1 to} 32 _-n are FIFO type buffers for temporarily storing the video data separated by the interface unit 31 for each channel. With the buffers 32 _{-1 to} 32 _-n , the data recording medium 20
The read speed of the video data from the display and the display speed on the image display unit 40 are adjusted. Buffer control unit 33 _{-1 to} 33
_-n is provided corresponding to each of the buffers 32 _{-1 to} 32 _-n , and controls the corresponding buffer 32 _-i (i = 1 to n) based on the control signal from the processor 35. That is,
Recording the video data input from the interface unit 31 in the buffers 32 _{-1 to} 32 _-n , and the buffers 32 _{-1 to} 3
It controls the output of the video data temporarily recorded in 2- _n to the video decoders 34-1 to 34 _{- n} . The buffer control unit 33 _-i (i = 1 to n) notifies the processor 15 of the values of the read pointer and the write pointer of the buffer 32- _i .

[0027] Video decoder 34 _-1 to 34C _-n sequentially reads the coded video data from the corresponding buffer 32 _-1 to 32 _-n, decodes each output channel ch1~ch
n. In the video decoders 34 _{-1 to} 34 _-n , the video data is appropriately output from the buffers 32 _{-1 to} 32 _-n and decoded so that continuous playback video data can be output to the channels ch1 to chn. In the present embodiment, the video data recorded on the data recording medium 20 is MPEG2 (Moving Picture coding Ex
The video decoders 34 _{-1 to} 34 _-n are encoded by the high-quality video encoding method by perts Group).
Also in, the decoding is performed based on the MPEG2 encoding method.

The processor 35 is a video data reproducing section 30.
The respective parts are controlled to perform desired operations. Keyboard 36
Is an external input device for setting operation conditions and the like for the video data reproducing unit 30.

The image display unit 40 shown in FIG. 1 is a multi-screen image display device in which n CRT devices 41 _{-1 to} 41 _-n are arranged in a grid pattern. Then, the n CRT devices 41 _{-1 to} 41 _-n are connected to the video data reproducing unit 3.
0 output channels ch1 to chn are connected to reproduce the video data output from each channel.

Next, the operation of the video data reproducing section 30 will be described.
It will be described with reference to FIG. Figure 6 shows the video data playback unit
It is a figure which shows the input and output data to 30, (A)
Is a diagram showing data reproduced from the data recording medium 20,
(B) is a video table from each channel of the video data reproducing unit 30.
It is a figure which shows the data output to the display part 40. The book
In the embodiment, the image display unit 40 includes four CRT devices.
41_-1~ 41 _-FourSince it is composed of
The body 20 has four channels that match the configuration of the image display unit 40.
The video data for the channel is recorded. That is, the figure
6, data A, B, C and D are video data, respectively.
Output from the output channels ch1 to ch4 of the reproducing unit 30.
CRT device 41_-1~ 41_-FourThe specified playback time displayed on
Video data for each. And the data of each channel
T is A₁~ A_m,B₁~ B_m,C₁~ C_m,D₁~ D_mM
Each of them consists of a data block for a specified playback time.
ing.

First, when an instruction to display video data on the image display unit 40 is input to the processor 35 via the keyboard 36, the processor 35 causes the interface unit 3 to operate.
The data recording medium 20 displays the video data to be displayed.
The control signal is output to read from the. The data recording medium 20 is based on the control signal.
Read more desired video data. At this time, the interface unit 31 sequentially reads the video data for each predetermined transfer data block. Specifically, print data as shown in FIG. 6A is sequentially read. The interface unit 31 further divides the read video data into video data for each channel and outputs the video data to the buffers 32 _{-1 to} 32- _n corresponding to the respective channels. As a result, the read data shown in FIG.
It is classified into four video data A to D as shown in FIG. 6 (B) and output to the processing system for each channel.

Buffer 32 corresponding to each channel_-1~ 3
2_-nThe video data output to the buffer controller 33
_-1~ 33_-nVideo decoder 3 as needed while being controlled by
4_-1~ 34_-nIs output to And video decoder 3
4_-1~ 34_-nAre sequentially decoded in each channel
Output from channels ch1 to chn.
It is. The output video data is stored in the 4
CRT device 41_-1~ 41 _-FourOutput to
Video data is displayed.

As described above, the circle of the present embodiment is
In the chiscreen image display system 1,
Multiple CRT devices using one data recording / reproducing device
41 _-1~ 41_-FourEach can display an image. I
Therefore, each CRT device 41_-1~ 41_-FourCorresponding to bidet
Oddeck is prepared, and they are synchronized with each other.
Compared with the conventional equipment that supplies video data vertically,
In addition, the device configuration is simplified and the size can be reduced. Ma
Also, for multiple VCRs with many mechanical components
Prevent the loss of reliability that can occur due to
can do. Also, compared to such conventional devices
Therefore, maintenance is obviously easier. In addition,
Since the video data is recorded on the disk recording medium,
You don't need to rewind the tape
It becomes possible to reproduce and display.

The present invention is not limited to this embodiment, but various modifications can be made. For example, in the present embodiment, recording of input video data,
Although the multi-screen image display system that performs both reproduction and display has been described, the present invention is not limited to such an integrated image display device. A video data recording device having only a configuration / function of recording data to be displayed on such a multi-screen, a video data reproducing device having only a configuration / function of reproducing the recorded video data, and the recorded data thereof. The present invention may be embodied by a device of each configuration such as a video display device which reproduces the video data and actually displays it on the display means.

Further, a specific processing method such as a video data compression method, a decoding method, an interface with a data recording medium may be any method. In addition to the hard magnetic disk device, the recording medium for recording video data is
Any recording medium such as a magneto-optical disk device may be used. Further, the number of CRTs installed in the video display device, the arrangement thereof, etc. are not limited to the 2 × 2 of the present embodiment, and may be 3
A configuration such as × 3, 4 × 4, or an arrangement in which they are not aligned in a grid pattern may be used, and an arbitrary configuration may be used.

[0036]

According to the image display device of the present invention, the image display has a multi-screen structure which makes it possible to simplify the device structure, simplify maintenance, improve reliability, and repeatedly display image data. A device can be provided. Further, according to the video data recording apparatus of the present invention, the video data to be displayed on the video display apparatus can be recorded on the recording medium so that the video data can be appropriately supplied to the video display apparatus. Further, according to the video data reproducing apparatus of the present invention, the recording medium recorded by the video data recording apparatus of the present invention can be reproduced so that the video data can be properly displayed on the video display means of the multi-screen structure.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a multi-screen image display system according to an embodiment of the present invention.

2 is a block diagram showing a configuration of a video data recording unit of the multi-screen video display system shown in FIG.

FIG. 3 is a flowchart showing a control procedure in a processor of the video data recording unit shown in FIG.

4 is a diagram showing a data recording format by the video data recording unit shown in FIG.

5 is a block diagram showing a configuration of a video data reproducing unit of the multi-screen video display system shown in FIG.

6A and 6B are diagrams showing input and output data to and from the video data reproducing unit shown in FIG. 5, FIG. 6A showing data reproduced from a data recording medium, and FIG. It is a figure which shows the data output to a video display part from each channel.

[Explanation of symbols]

1 ... Multi-screen video display system 10 ... Video data recording unit 11 ... Video encoder 12 ... Buffer 13 ... Buffer control unit 14 ... Disk interface 15 ... Processor 16 ... Keyboard 20 ... Data recording medium 30 ... Video data reproducing unit 31 ... Interface unit 32 ... Buffer 33 ... Buffer control unit 34 ... Video decoder 35 ... Processor 36 ... Keyboard 40 ... Video display unit 41 ... CRT device

Claims (4)

[Claims] 1. A video data recording device, wherein a plurality of video display devices are arranged in a two-dimensional array, and video data to be supplied to a multi-screen display device which constitutes one screen as a whole is recorded. A randomly accessible recording medium on which video data is recorded, a plurality of encoding means for respectively compressing the video data input corresponding to each of the plurality of video display devices, and a plurality of compression means respectively compressed by the plurality of compression means. A video data recording device having recording means for sequentially recording the respective video data on the recording medium so that the video data displayed simultaneously on the plurality of video display devices can be reproduced simultaneously. 2. The recording means records the video data displayed simultaneously on the plurality of video display devices at predetermined time intervals in a predetermined continuous area of the recording medium.
The described video data recording device. 3. A video data reproducing device in which a plurality of video display devices are arranged in a two-dimensional array and which supplies video data to a multi-screen display device which constitutes one screen as a whole. Reproducing means for simultaneously reproducing video data displayed simultaneously on the plurality of video display devices from a recording medium on which video data displayed on the device is encoded and recorded; and Data selection means for selecting reproduced video data for each of the plurality of video display devices, and temporarily storing the video data selected for each of the plurality of video display devices, corresponding to each of the video display devices. A plurality of buffer means provided, and the video display device which sequentially decodes the video data stored in the buffer means and corresponds the decoded video data. And a plurality of decoding means provided corresponding to the respective video display devices for outputting to the video data reproducing device. 4. Arranged in a two-dimensional array, 1 as a whole
A plurality of video display means constituting one screen, a plurality of coding means for respectively compressing video data input corresponding to each of the plurality of video display devices, and a plurality of compression means respectively compressed by the plurality of compression means Recording means for sequentially recording the video data on a recording medium so that the video data displayed simultaneously on the plurality of video display devices can be reproduced simultaneously, and random access for recording the video data is possible. The recording medium, a reproducing unit that simultaneously reproduces data that is simultaneously displayed on the plurality of video display units from the recording medium, and the simultaneously reproduced video data, the plurality of video display units A data selection unit that selects each of the plurality of video display units, and a data selection unit that temporarily stores the video data selected for each of the plurality of video display units. And a plurality of buffer means, sequentially decodes the video data stored in said buffer means, an image display device having a plurality of decoding means for outputting to said image display means corresponding the video data 該復 Goka.