JP2000149431A - Data recording and reproducing device, and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data recording and reproducing device, and a method therefor capable of supplying the same file data to plural viewers with an arbitrary time shifted by making an input buffer means and an output buffer means access the recording and reproducing means by time-sharing. SOLUTION: An input part 12 is provided with a buffer memory 23 which temporarily stores video data outputted from an SD I/F 20 and an SD I/F 20 to which the video data are inputted. A recording and reproducing part 13 is provided with a disk device 28 which records and also reproduces the video data read from the buffer memory 23. An output part 14 is provided with the buffer memory 23 for temporarily storing the video data outputted from the recording and reproducing part 13 and the SD I/F 20 outputting the video data outputted from the buffer memory 23. A disk drive control part 5b controls the disk device 28 to perform recording and reproducing the video data therein by time-sharing, and also controls timing for reading the video data from the buffer memory 23 as an input buffer means and an output buffer means.

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 a data recording / reproducing method for recording information data from an information data input apparatus, reproducing the recorded information data, and outputting the reproduced information data to an information data output apparatus. .

[0002]

2. Description of the Related Art Conventionally, when a plurality of information data recorded by a plurality of input devices are supplied to a plurality of viewers as needed via a plurality of output devices, a reproducing device is required for each of the plurality of viewers. Met.

If the information data is, for example, video data, a plurality of viewers need a video tape recorder 54 as shown in FIG. For example, a video signal obtained via a satellite antenna 51 is recorded on a video tape 53 by an input video tape recorder 52, and the video tape 53 on which the video signal is recorded is viewed by an output video tape recorder 54 dedicated to a viewer. Was supplied to the people at any time. Further, for example, a video signal photographed by the studio camera 55 is recorded by the input video tape recorder 56, and this video signal is provided at any time, or by using the portable small camera integrated video tape recorder 57 outdoors. The same applies to the case where a captured video signal is supplied as needed.

[0004]

By the way, as shown in FIG. 3, a video signal which is recorded and transmitted to a viewer at any time using input video tape recorders 52 and 56 and an output video tape recorder 54. In the data recording / reproducing system, since the recording medium is the video tape 53, various problems have occurred.

[0005] First, if a group of video signals is called video file data, when this one video file data is recorded, a part of the video file data recorded several tens of minutes ago is stored in the video file data. It has been difficult to reproduce the entire file data without interrupting the recording.

Further, one video file data cannot be supplied to a plurality of viewers with a small time difference. To do this, it was necessary to prepare a plurality of video tapes on which the corresponding video file data was copied and recorded.

Further, a plurality of video file data on the same video tape cannot be reproduced without interruption in an arbitrary order desired by the viewer. To do this, it was necessary to prepare a video tape on which a plurality of video file data were recorded in any order desired by the viewer.

Further, a plurality of video file data cannot be reproduced without interruption between different video tapes.

[0009] In the video data recording system,
The video data from the dedicated input devices is recorded by one recording device and reproduced by one viewer to one viewer, and the recording / reproduction of a plurality of channels can be performed by one recording / reproduction device. It was impossible. For this reason, the cost of constructing the system was high.

The present invention has been made in view of the above-mentioned circumstances, and can reproduce a portion recorded several minutes to several tens minutes ago in the same file data without interrupting the recording of the entire file data. An object of the present invention is to provide a data recording / reproducing apparatus and a data recording / reproducing method.

It is another object of the present invention to provide a data recording / reproducing apparatus and a data recording / reproducing method capable of supplying the same file data to a plurality of viewers at an arbitrary time difference.

Another object of the present invention is to provide a data recording / reproducing apparatus and a data recording / reproducing method which enable time-division recording / reproducing.

Still another object of the present invention is to provide a data recording / reproducing apparatus and a data recording / reproducing method for reproducing a plurality of file data without interruption in an arbitrary order.

[0014]

In order to solve the above-mentioned problems, a data recording / reproducing apparatus according to the present invention has an input means for inputting at least data including video data, and the data output from the input means. An input buffer means for temporarily storing the data, a recording / reproducing means for recording the data output from the input buffer means on a hard disk, and reproducing the data recorded on the hard disk; Output buffer means for temporarily storing the data thus output, output means for outputting the data output from the output buffer means, and access to the recording / reproducing means of the input buffer means and the output buffer means is time-divisional. The data from the input buffer means is input to the recording / reproducing means and The data from the reproducing means and control means for controlling so as to be input to said output buffer means.

In order to solve the above-mentioned problems, a data recording / reproducing method according to the present invention includes a first first step in which data including at least video data is input, and a first step in which the data is input in the first step. A second step of temporarily storing data, a third step of recording the data temporarily stored in the second step on a hard disk, and reproducing the data recorded on the hard disk; A fourth step of temporarily storing the data reproduced in the third step; and a fifth step of outputting the data temporarily stored in the fourth step. Recording and reproduction of the above data are performed in a time-division manner.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a data recording / reproducing apparatus and a data recording / reproducing method according to the present invention will be described with reference to the drawings.

First, a first embodiment of the data recording / reproducing apparatus according to the present invention will be described below. The first embodiment is a video data recording / reproducing apparatus that handles video data as information data, records a group of the video data as video file data on a hard disk, and reproduces the video file data from the hard disk. .

As shown in FIG. 1, the video data recording / reproducing apparatus 5 is incorporated in a video server (Video Server) system 11 for providing the video file data to a user. In addition to the video data recording / reproducing device 5, the video server system 11 is a data transfer device that transfers video data from outside the system to the video data recording / reproducing device 5 and transfers video data from the video data recording / reproducing device 5 to the outside of the system. And a system controller 9 for controlling the video data recording / reproducing device 5 and the data transfer device 6 via a control network 8 in the video server system 11.

Also, outside the video server system 11, a communication satellite receiving antenna 1, a video camera 2, and a video tape recorder 3, which are video data input devices for providing video file data to the video data recording / reproducing device 5, are provided. Also, a video tape recorder 3, a signal transmitting device 4, an image monitor device, and the like, which are video data output devices serving as output destinations of video data reproduced from the video data recording / reproducing device 5, are connected. The signal transmitting device 4 is a device for transmitting the requested video file data to a user or the like who can access the video server system 11. Further, the video server system 11 is also connected to an editing control device 7 for editing video file data supplied via the data transfer device 6.

The video data recording / reproducing device 5 records the video file data supplied from the video data input device in a time-division manner, reproduces the recorded video data in a time-division manner, and supplies the video data to the video data output device. Output. Therefore, the video data recording / reproducing device 5 includes a disk drive 5a and a disk drive control unit 5b described below. The disk drive 5a has an input section to which video data is input, an input buffer memory section for temporarily storing the video data output from the input section, and records the video data output from the buffer memory section on the hard disk. In addition, a randomly accessible recording medium for reproducing video data recorded on the hard disk, an output buffer memory unit for temporarily storing video data output from the recording medium, and video data output from the output buffer memory unit And an output unit that outputs The disk drive control unit 5b is configured to access the recording medium in a time-division manner by the input buffer memory unit of the disk drive 5a based on a control signal supplied from the system control unit 9 and output the video data to the recording medium. The output buffer memory unit controls the disk drive 5a such that the output buffer memory unit accesses the recording medium in a time sharing manner and inputs video data from the recording medium. The detailed configuration and operation of the video data recording / reproducing device 5 will be described later.

Video data obtained from the video tape recorder 3, the satellite antenna 1, and the video camera 2, which are video data input devices, are serial digital interfaces (SDI, SMPTE259).
M) and the data transfer device 6
Is recorded on the video data recording / reproducing device 5 via the.

The data transfer device 6 transfers the video data based on the SDI from the video data input device to the video data recording / reproducing device 5 and simultaneously transmits the video data to the video data recording / reproducing device 5.
An SDI switching unit 6a and a switching control unit 6b are provided to transfer the video data from the SDI to the video data output device. The SDI switching unit 6a has a configuration that allows easy connection to an arbitrary device, and is controlled by the switching control unit 6b based on a control signal supplied from the system control device 9.

The video tape recorder 3, which is both a video data input device and a video data output device, comprises a video tape recorder main unit 3a and a video tape recorder control unit 3.
b. Video tape recorder control unit 3b
Controls the operation of the video tape recorder main unit 3a based on a control signal supplied from the system control device 9.

The editing control device 7 performs an editing process on the video data read from the disk drive 5a of the video data recording / reproducing device 5. The video data on which the editing process has been performed is recorded on the disk drive 5a again. In this case, in addition to the address data of the video data before editing, the address data of the video data after editing is stored in the system controller 9.
Is held. In the case where the editing process is not particularly required and a portion necessary for transmission is selected, only the address of the necessary portion is required, and the address data is held in the system control device 9.

A data transfer network 10 is provided between the video data input device, the video data output device, the video data recording / reproducing device 5, the data transfer device 6, and the editing control device 7. The video data is transmitted between the devices via the data transfer network 10. The output signal of the video server system 11 is transmitted from the signal transmission device 4 to the user's terminal device via the data transfer network 10.

As the control system network 8, a computer network such as a medium-scale network using a coaxial cable or a large-scale network using an optical fiber can be used.

The video data recording / reproducing device 5 incorporated in the video server system 11 sets a recording location and a connection between devices based on a control command supplied from a system control device 9 via a control system network 8. Then, video data supplied from the input data device via the data transfer system network 10 is recorded, and the recorded video data is reproduced and output to the output data device such as the signal transmission device 4.

Next, the configuration of the video data recording / reproducing apparatus 5 will be described with reference to FIG. As described above, the video data recording / reproducing device 5 includes the disk drive 5a
And a disk drive control unit 5b. First, the disk drive 5a includes an input unit 12, a recording / reproducing unit 13 for recording and reproducing the video data output from the input unit 12, and an output unit for outputting the video data reproduced from the recording / reproducing unit 13. And an output unit 14.

On the other hand, the disk drive control unit 5b controls the input unit 12 to record the video data in the recording / reproducing unit 13 in a time-division manner, and controls the output unit 14 to transmit the video data from the recording / reproducing unit 13. It is configured to perform control for reproducing data in a time-division manner.

The input section 12 includes a serial digital interface (hereinafter referred to as SDI / F) 20 as input processing means for inputting the video data, and an SDI / F.
A buffer memory 23 serving as input buffer means for temporarily storing the video data output from the memory 20; Further, the input unit 12 includes a data formatter 21 for formatting the serial digital video data from the SDI / F 20 so as to be compatible with the processing inside the disk drive 5a.

The recording / reproducing section 13 includes a random access disk device 28 for recording and reproducing the video data read from the buffer memory 23. The recording / reproducing unit 13 includes an error check code adding / detecting unit 25.

Error check code addition / detection section 25
The error correction data is added to the video data from the buffer memory 23 and output to the disk device 28, and the video data output from the disk device 28 is input and the video data has an error. In this case, error correction is performed using the error correction data, and the result is output to the buffer memory 23.

Further, the recording / reproducing unit 13 includes a buffer memory 26, a small computer
System Interface (Small Computer Systems
Interface: Hereinafter, SCSI. A) a protocol controller 27 according to the protocol is provided.

The disk device 28 is a randomly accessible HDD.

The output section 14 includes a buffer memory 23 which is also an output buffer means for temporarily storing the video data output from the recording / reproducing section 13, and a buffer memory 2.
The SDI / F 20 is also an output processing means for outputting the video data output from the SDI / F3. Output unit 14
Has a data formatter 21 between the buffer memory 23 and the SDI / F 20.

Next, the disk drive controller 5b will be described. The disk drive control unit 5b fetches a control command supplied from the system control device 9 through the control system network 8 via the network interface 31. The control command fetched via the network interface 31 is transmitted to the central processing unit (C
PU) 34. The control command is stored in a random access memory (RAM) 32 as needed.
The control command decoded by the CPU 34 is transmitted to the disk drive 5 via the interface 33 as a control signal.
a. The disk drive control unit 5b controls the recording and reproduction of the video data in the disk device 28 in a time-division manner, and reads the video data from the buffer memory 23 as the input buffer means at the same time. The read timing of the video data from the buffer memory 23 as the output buffer means is controlled.

For this reason, the disk control section 5b executes a data recording / reproducing method for recording / reproducing video data to / from the disk device 28 which can be randomly accessed, in accordance with a control command from the system controller 9. This data recording / reproducing method has first to fifth steps, and the disk drive control unit 5b executes each step of the data recording / reproducing method as follows. That is, in the first step, video data is input to the SDI / F 20. In the second step, the video data input to the SDI / F 20 is temporarily stored in the buffer memory 23. In the third step, the video data temporarily stored in the buffer memory 23 in the second step is recorded on the hard disk, and the video data recorded on the hard disk is reproduced. In the fourth step, the video data reproduced in the third step is temporarily stored in the buffer memory 23. In the fifth step, the video data temporarily stored in the buffer memory 23 in the fourth step is output.
In particular, in the third step, recording and reproduction of video data on the hard disk are performed in a time-division manner.

Next, the operation of the video data recording / reproducing apparatus 5 when the disk drive control section 5b executes the above data recording / reproducing method will be described. This is an operation of recording and reproducing the video file data supplied from the video data input device on one hard disk of the disk device 28. Here, the data network 10 for inputting / outputting video data between the video data recording / reproducing device 5 and the data transfer device 6 has separate lines for input and output. However, the data network 10 can freely switch between input and output.

If the video data recording / reproducing device 5 is ready to perform a recording operation, a serial video file data is transmitted from the video data input device via the data transfer network 10 under the control of the system control device 9. Is supplied. First, the serial digital video data input to the SDI / F 20 is supplied to the buffer memory 23 via the data formatter 21. The buffer memory 23 temporarily stores the video file data by a predetermined amount and then reads and stores the video file data.
Send to 3. The video data sent to the recording / reproducing unit 13 is supplied to an error check code adding / detecting unit 25, where an error check code is added. Then, the video data to which the error check code has been added is temporarily written to the buffer memory 26. Protocol controller 2
Reference numeral 7 records the video data read from the buffer memory 26 in the HDD of the disk device 28. Then, video data is read from the HDD in a time sharing manner with the recording operation. The read video data is supplied to the error check code addition / detection unit 25 via the buffer memory 26, where an error is detected. Video data for which an error has been detected is written to the buffer memory 23. The video data is stored in the buffer memory 23 at a predetermined timing.
From the data formatter 21 and the SDI
The data is output from the data network 10 to the data transfer device 6 via the / F20.

Here, the HDD of the disk device 28
The recording and reproduction operations are performed in a time-division manner by a single head under the control of the disk drive unit 5b, so that the input and output of video data are not interrupted to the outside of the video recording / reproduction device 5 respectively You can make it look like you're going continuously.

It should be noted that the disk unit 28 is an HDD
However, any recording / reproducing device that can be randomly accessed, such as a magneto-optical disk device, is not limited to the HDD.

Even if there are a plurality of inputs, input 1 is present at a certain moment, input 2 at the next moment, input 3 at the next moment, and so on.
Since output 1, output 2,... Are controlled in a time-division manner, apparently simultaneous recording and reproduction can be realized.

[0043]

According to the present invention, simultaneous recording and reproduction can be realized by accessing the HDD in a time-division manner, so that the same file data can be supplied to a plurality of viewers at an arbitrary time difference. Further, a plurality of file data can be reproduced without interruption in an arbitrary order.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a state in which a video data recording / reproducing apparatus according to an embodiment of the present invention is incorporated in a video server system.

FIG. 2 is a block diagram showing a detailed configuration of the video data recording / reproducing apparatus of the embodiment.

FIG. 3 is a diagram showing a conventional video data recording / reproducing system.

[Explanation of symbols]

12 input unit, 13 recording / reproducing unit, 14 output unit, 20
SDI / F section, 23 buffer memory section, 24 distribution /
Collecting part, 25 Error check code addition / detection part, 2
8 Disk unit

Claims (4)

[Claims] An input unit to which data including at least video data is input; an input buffer unit for temporarily storing the data output from the input unit; and an input buffer unit for storing the data output from the input buffer unit. Recording and reproducing means for reproducing the data recorded on the hard disk while recording on the hard disk, output buffer means for temporarily storing the data reproduced from the recording and reproducing means, and output from the output buffer means An output unit for outputting data, and the input buffer unit and the output buffer unit access the recording / reproducing unit in a time-division manner, and the data from the input buffer unit is input to the recording / reproducing unit and The data from the recording / reproducing means is controlled to be input to the output buffer means. Data recording and reproducing apparatus, characterized in that it comprises a control means. 2. The control means reads out the data temporarily stored in the input buffer means in a time-division manner and outputs the data to the recording / reproduction means, and simultaneously reads the data output from the recording / reproduction means in a time-division manner. 2. A data recording / reproducing apparatus according to claim 1, wherein said data is inputted to said output buffer means. 3. A first step in which data including at least video data is input; a second step of temporarily storing the data input in the first step; A third step of recording the data temporarily stored in the step in the hard disk and reproducing the data recorded in the hard disk; and a fourth step of temporarily storing the data reproduced in the third step. And a fifth step of outputting the data temporarily stored in the fourth step. In the third step, recording and reproduction of the data on and from the hard disk are performed in a time-division manner. Data recording and reproducing method. 4. In the second step, the input data is temporarily stored in the input buffer means, read out from the input buffer means in a time division manner, and output to the hard disk. 3. The data recording / reproducing method according to 3.