JPH11250578A - Plural media recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plural media recording device which can make backup by plural media having different recording/transfer speed and including backup media, without specially setting a time required for backup, without missing high speed response at the time of recording which is required for event recording and the like. SOLUTION: Picture data is written in a first bus buffer 81 at the time of recording external video data in a buffer controller 40, further, when a transmission path 46 is in a state in which it is not occupied by other data and devices, picture data of the first bus buffer 81 is read out, and transferred to media A, B. C of fixed recording devices 61-63 through the transmission path 46. As this data transmission operation is asynchronous to data transmission in a transmission path 13 formed in a data bus 2, that is, both operation are independent each other, data transmission operation in the transmission path 13 also can be performed in parallel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-media recording apparatus for recording digital data supplied continuously in time, for example, digitized video signals and the like in parallel on a plurality of types of recording media.

[0002]

2. Description of the Related Art A plurality of media recording devices, such as a digital video recording device for surveillance, may store video signals from a surveillance camera or the like in a plurality of types of storage media (hereinafter simply referred to as media). ).

In a general monitoring video data recording apparatus, in order to perform recording in real time, high-speed response is excellent, and recording is started by an alarm input or the like.
A fixed-type rotary disk drive that can not only quickly respond to various recording modes but also ensure a relatively large recording capacity is mainly used. Also, in order to eliminate deterioration of image data and the like during data transfer, a digital recording method is becoming mainstream. For example, in an industry such as a bank, in order to store a library of recorded data, it is necessary to monitor data that is once recorded continuously on a fixed rotating disk type medium and transferred to a removable digital recording tape type medium. Digital video recording device is used. This is because administrative guidance is required to use a recording device capable of storing recorded video data for a certain period of time, in addition to a function of continuously recording monitoring video for 24 hours.

[0004] First, a general monitoring video data recording apparatus will be described.

FIG. 7 is a block diagram showing a system configuration of a main part of a conventional monitoring digital video recording apparatus.

In FIG. 1, reference numeral 1 denotes a digital video data input / output terminal, and 10 denotes a compression / decompression processing block for compressing / decompressing digital video data. Reference numeral 20 denotes a CPU (Central Information Processing Unit) for controlling data transmission to each block of the system, and reference numeral 2 denotes a data bus through which data flows according to a command from the CPU 20. In addition to the compression / decompression block 10, a recording memory buffer 30 and a buffer controller 40 are connected to the CPU 20 via the data bus 2. The recording memory buffer 30 temporarily records the digital video data after the compression is completed. The recording memory buffer 30 has a selection switch 31 for determining whether or not the temporarily recorded data can be transmitted to the buffer controller 40. Is provided.

5 is a device data bus, 50 is a CPU 2
It is a bus controller that controls the flow of data in the device data bus 5 according to a command of 0. Through this device data bus 5, the buffer controller 4
Zero and three fixed recording devices 61 to 63 and a backup device 70 are connected to each other, and a bus buffer 80 is directly connected to the buffer controller 40. When transferring data between the recording devices 61 to 63 and the data bus 2 on the CPU 20 side, the buffer controller 40
Buffer control is performed by temporarily storing data in 0. The buffer 90 temporarily stores the data transferred from the compression / decompression block 10 to the data bus 2.

As the fixed recording devices 61 to 63, those having built-in rotating disk type media A, B and C such as a hard disk drive (HDD) capable of high-speed and large-capacity recording are used. On the other hand, as the backup device 70, a device that can take out a removable (removable) recording medium 71 from the main body of the device and store the recorded data in a library, such as a digital tape of a digital tape recording device, is used. Is done. Such removable media include MO (magneto-optical recording device) and DVD, which are characterized by high-speed response.
-Rotating disk type media such as RAM, and helical scan type digital recording tape type media such as DAT and DVC characterized by large capacity recording can be roughly classified into two types.

Next, a recording operation in the conventional apparatus will be described.

FIG. 8 is a flowchart showing an operation mode of video recording in the conventional apparatus. The digital video data 11 created outside is sent from the input / output terminal 1 to the compression / decompression processing block 10 and input to the data bus 2 as compressed data 13 (step ST1). The data 13 is sent to the recording memory buffer 30 in units of subdivided W bytes (hereinafter referred to as [B]), where it is temporarily stored (step ST2). Here, a fixed recording capacity of X megabytes (hereinafter, referred to as “the memory capacity”) is stored in the recording memory buffer 30.
[MB]. ) When the above record data is accumulated,
It is determined that transmission to the buffer controller 40 is permitted, and the data 34 for one transmission block composed of Y [KB] determined by the selection switch 31 is stored in the recording memory buffer 30.
From the buffer controller 4
0 (step ST3). Here, if necessary, the data 55 before being recorded on the fixed recording devices 61 to 63 is temporarily stored in the bus buffer 80 (step ST4), or is transmitted to the device data bus 5 as data 46.

In the data transmission operation for transmitting the data 13 and the data 34 via the data bus 2, the CPU 20 controls time-division processing for each switching between the transmission blocks. In addition, the fixed recording device 61
The recording order of the data 46 from the device data bus 5 is determined for the recording disk type media A to C of 63 to 63. Here, the recording is performed in the order of the upper media A to the lower media B and C.

That is, the device bus controller 50 checks the presence or absence of an empty area from the upper medium A (step ST5). If there is an empty area, the data 46 is written in the fixed recording device 61 in order. (Step ST6). Then, when the capacity of the fixed recording device 61 is full, the data 46 is similarly recorded on the medium B in the fixed recording device 62 which is the next lower device (step ST7,
8) Alternatively, it is recorded on the medium C (step S
T9, 10). If it is determined in step ST9 that there is no empty area in the lowermost medium C, it is determined that the capacity of the fixed recording devices 61 to 63 has been exhausted, and the recording operation is terminated, or The process returns to start overwriting (step ST11).

Next, the operation of backing up the data on the fixed recording disk by the portable medium 71 will be described.

FIG. 9 is a flowchart showing a backup mode for transferring data at the time of backup. CPU 20
, The start of the backup operation is instructed to the device bus controller 50, the range of the backup symmetric data is determined (step ST12), the transfer path of the data 46 is opened on the device data bus 5, and the fixed recording devices 61-63. In the backup designated range, the data is transmitted to the device data bus 5 as backup data for each reference unit from the recording area of the upper-level medium for which transfer has not been completed (steps ST13 to ST15). This data 46
Is sent to the buffer controller 40 (step S
T16), via which the bus buffer 80
(Step ST17), and the data bus 9
And is temporarily recorded in the recording memory buffer 30 (step ST18).

Here, the device bus controller 50 closes the transfer path of the data 46 and opens the transfer path of the data 47. Thus, the data stored in the recording memory buffer 30 is sent out to the buffer controller 40 again via the data bus 2 (step ST19).
Then, the data is recorded in the bus buffer 80 as needed (step ST20), or is directly poured as data 47 into the device data bus 5 and written to the medium 71 which can be taken out by the backup device 70 (step ST21).

When such an operation is completed, the device bus controller 50 closes the transfer path of the data 47, opens the transfer path of the data 46 again, and shifts to processing for the next data transmission unit.

As described above, by transferring data from the fixed disk drive to the digital tape drive, digital data is recorded on a removable medium 71 such as a magnetic tape and stored as a library. Will be possible.

However, in the monitoring digital video recording apparatus for performing such data transfer, the fixed recording device 61 is used.
In the backup mode to backup ~ 63,
Since data is transferred to the backup device 70 from the fixed recording device to the removable medium 71, recording of the monitoring result video data is temporarily stopped. This is because data transfer cannot be performed in parallel with the recording mode because the recording transfer rates of the rotating disk type media A, B, and C and the removable medium 71 such as a magnetic tape are significantly different.

Next, a description will be given of a raid operation in the simultaneous writing method to a plurality of media.

In an information recording apparatus which records not only video data but also various digital information, a RAID (RAI) is used as a measure against partial destruction of recorded contents in a plurality of devices.
D) A risk avoidance method of driving has been proposed. A RAID (Redundant Arrays of Inexpensive Disks) is a storage system that uses a fixed disk to provide redundancy, and is used for the purpose of improving the performance of recording operation for a plurality of devices and improving reliability. The raid operation includes (1) striping (RAID0), (2) mirroring (RAID1), (3) striping with dedicated parity (RAID3), and (4) striping improved with interleaved parity (RAID5).

(1) RAID0 Striping Striping is to divide data into the number of disks used for stripes and write the divided data to each disk drive. Since the speed is obtained by dividing the data, if a failure occurs in one device, all data is lost, and there is no redundancy.

(2) RAID1 Mirroring Mirroring writes the same data to two or more disks. As a result, even if a failure occurs in one drive, the operation can be continued with another drive. In terms of cost, it requires twice the number of drives, which is more expensive than a standard system. However, even when a failure occurs, processing can be performed without deteriorating performance, and redundancy is extremely high.

(3) Striping by RAID3 Dedicated Parity In addition to the striping of RAID0, a mechanism is provided to prevent data loss in the event of a failure by providing one parity disk. In the case of RAID3, spindles are synchronized in each disk, and sequential access for simultaneously reading and writing sectors in each drive becomes faster, which is suitable for image processing. On the other hand, the advantage of random access is lost and it is not suitable for a system such as a database that requires high transaction processing.
Only one extra disk needs to be prepared in addition to the number N of required capacity, and a system can be constructed at low cost.

(4) RAID5 Striping Improved with Interleaved Parity Unlike the configuration of RAID3, data and parity information are interleaved with the disk array in a circular pattern without specifying a parity drive. Since access to the drive is performed asynchronously, it is suitable for a system for performing transaction processing, and high-speed random access is also possible. In addition, the number of disks can be configured with N + 1 as in the case of RAID3. For this reason, most systems called raids today have a RAID 5 system configuration.

When data is simultaneously written to a plurality of media, a surveillance digital video recording device can be realized by adopting such a raid system configuration by simply inputting bit stream data after replacing it with digital video data. At the time of high-speed data transmission or partial damage of a recording medium can be reduced.

[0026]

However, in the conventional multi-media recording apparatus, even if the raid operation is adopted in the simultaneous writing method, the system configuration is different from that of the simultaneous recording on the fixed disk and the digital tape recording medium. In addition, when recording devices having significantly different transfer rates at the time of recording are combined, there is a problem that high-speed response at the time of recording is impaired.

That is, the recording operation must be stopped in order to secure a backup time in the conventional multiple media recording apparatus. Alternatively, in a monitoring device that requires continuous recording for 24 hours, in order to continue recording monitoring data even during the stop time, two recording devices are used to alternately perform recording and backup. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to provide a high-speed response at the time of recording required for event recording or the like without specially setting a time required for backup. It is an object of the present invention to provide a multi-media recording apparatus that can create a backup using a plurality of media having different recording transfer speeds, including a backup medium, without impairing the performance.

[0029]

According to the present invention, there is provided a multi-media recording apparatus for recording digital data on a plurality of types of recording media, comprising: an input terminal to which digital data is continuously supplied; First recording means connected to the terminal via a data bus,
A second recording unit to which the digital data read from the first recording unit is transferred, an operation of writing the digital data to a recording medium of the first recording unit, and a second recording operation from the first recording unit Control means for time-divisionally controlling the transfer operation of the means to the recording medium.

Further, in the multiple-media recording apparatus according to the present invention, the second recording means includes a recording medium larger than the recording capacity of the recording medium of the first recording means.

Further, in the multi-media recording apparatus according to the present invention, the second recording means includes a separable recording medium.

Further, in the multiple media recording apparatus according to the present invention, the first recording means has a backup pointer indicating the range of digital data which has been transferred to the second recording means, and the second recording means according to the backup pointer. It controls the transfer operation to the means.

Further, in the multiple-media recording apparatus according to the present invention, the control means may control the second recording when the recording medium of the second recording means has a smaller recording capacity than the recording medium of the first recording means. The amount of digital data that can be written in the first recording means is limited according to the recording capacity of the recording medium provided in the means.

Further, in the multiple-media recording apparatus according to the present invention, when the recording medium is separated from the second recording means, only the writing operation of the first recording means is continued.

Further, in the multiple-media recording apparatus according to the present invention, the first recording means shifts to an overwriting operation when the recording capacity of the recording medium is exceeded, and the recording medium provided in the second recording means. The transfer operation is continued until the recording capacity is reached.

Further, in the multiple-media recording apparatus according to the present invention, the control means performs time-division control in which the write operation of the first recording means is prioritized over the transfer operation.

Also, the multiple media recording apparatus according to the present invention includes a first buffer memory for temporarily storing digital data written by the first recording means, and a digital data read from the first recording means for temporarily storing the digital data. And a buffer control means having a second buffer memory for storing.

[0038] Also, in the multiple media recording apparatus according to the present invention, a compression means for compressing digital data between the input terminal and the first buffer memory, and a third buffer memory for temporarily storing the compressed data. And means for controlling the transfer of the data stored in the third buffer memory. During data transfer from the first recording means to the second recording means, the first buffer means This is to stop data transfer to the memory.

Further, the multi-media recording apparatus according to the present invention monitors the amount of data stored in the third buffer memory, and when the amount of data exceeds a predetermined recording capacity, the second recording means. The transfer of data from the third buffer memory to the first buffer memory is restarted.

Further, in the multi-media recording apparatus according to the present invention, the transfer rate of the digital data to the third buffer memory may be the transfer rate to the first and second buffer memories or the first and second recording means. Is lower.

Further, in the multi-media recording apparatus according to the present invention, the digital data is digital video data input at a constant rate.

[0042]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described.

Embodiment 1 FIG. 1 is a block diagram showing a configuration of a monitoring digital video recording apparatus according to Embodiment 1 of the present invention. In the figure, reference numeral 1 denotes an input / output terminal for digital video data, and 10 denotes a compression / decompression block. The digital video data 1 is obtained by compressing input non-compressed digital video data 11 or expanding it after compression.
2 is output.

Reference numeral 20 denotes a CPU (Central Information Processing Unit) for controlling data transmission between each block in the system, 2 denotes a data bus through which data flows in accordance with a command from the CPU 20,
Is a recording memory buffer for temporarily storing digital video data after compression, 40 is a buffer controller, 5 is a buffer controller 40 and fixed recording devices 61 to 63,
A device bus 90 for flowing data with the backup device 70 and a buffer 90 for the data bus 2. The buffer controller 40 includes a first bus buffer 81 for temporarily storing data on the data bus 2 according to a command from the buffer controller 40, and reading from the fixed recording devices 61 to 63 on the bus 5 according to a command from the buffer controller 40. A second bus buffer 82 for temporarily storing the reproduced video data is connected.

The buffer controller 40 transfers data on the data bus 2 or the device bus 5 to the bus buffer 8.
Control is performed so that the data in the bus buffers 81 and 82 is sent out to the data bus 2 or the device bus 5 by temporarily storing the data at 1 and 82. In addition, a transmission path 13 for transmitting the compressed video data is formed between the compression / decompression block 10 and the recording memory buffer 30 according to a command from the CPU 20, and a transmission path 13 between the recording memory buffer 30 and the buffer controller 40. Is formed with a transmission path 34 for transmitting the compressed video data. Reference numeral 31 denotes a selection switch for selecting whether to transmit the compressed digital video data stored in the recording memory buffer 30 to the first bus buffer 81 of the buffer controller 40.
The buffer controller 40 and the bus buffer 81 are connected by a transmission path 41 for transmitting compressed video data. The buffer controller 40
Between the fixed recording devices 61 to
They are connected by a transmission path for transmitting the reproduced video data read from the memory 63.

50 is a device bus controller,
The data flow on the device bus 5 is controlled by a command from the CPU 20. Thereby, the buffer controller 40
A transmission path 46 for transmitting video data between the fixed recording devices 61 to 63 and a transmission path 47 for transmitting video data between the buffer controller 40 and the backup device 70 are formed. Here, the fixed recording devices 61 to 63 are all fixed recording devices for recording digital data,
C is built in such that it cannot be taken out. On the other hand, the backup device 70 is a removable device having a removable medium 71, and is configured to back up and record digital data.

When compared with the configuration of the conventional device described above, the blocks newly added or changed in the system of this embodiment are the first and second bus buffers 8.
1, 82.

Next, in the multi-media recording apparatus according to the present invention, the operation of the recording system in the mode in which the recording contents are backed up by the removable device 70 while the recording of the digital image data to the fixed recording device is continued, and the operation of the backup system. The operation will be described.

FIG. 2 is a flowchart illustrating the video recording mode according to the first embodiment.

Digital video data 1 created externally
1 from the input / output terminal 1 to the point where it is sent to the recording memory buffer 30 (steps ST100 to ST10).
6) is the same as the conventional configuration, and a detailed description is omitted. The data temporarily stored in the recording memory buffer 30 is managed by the CPU 20 and the selection switch 31 as follows.

First, it is determined whether or not the recording memory buffer 30 has accumulated a certain recording capacity X1 [MB] or more (step ST108). If the recording capacity is equal to or smaller than the predetermined recording capacity, the process returns to step ST104, and at the same time, a backup mode described later is executed in parallel (see FIG. 3). If the recording capacity is equal to or more than the predetermined recording capacity, step ST11
The process proceeds to 0, and it is determined whether the transmission path 13 is in use.
If it is in use, the process returns to step ST104. If it is not in use, it is determined whether there is an empty area in the first bus buffer 81 and data can be written there (step ST112). If there is no free area, the process returns to step ST104, and if there is a free area, the process proceeds to step ST114. The data temporarily stored in the recording memory buffer 30 is controlled by the CPU 20, and is determined by one determined transmission block Y [KB]. The data is sent to the buffer controller 40 through the transmission path 34,
1 is written to the first bus buffer 81.

The buffer controller 40 and the CP
U20 monitors the state of the first bus buffer 81 and, after finishing sending out a certain amount of data from the first bus buffer 81, again transmits the data from the recording memory buffer 30 to the transmission path 34.
And returns to the operation of writing image data to the first bus buffer 81, and the subsequent operations are repeated.

As described above, the buffer controller 40
At the time of recording video data from the outside, image data is written to the first bus buffer 81, and if the transmission path 46 is not occupied by other data or devices (step ST116), the first bus buffer 81 is not used. Is read out from the bus buffer 81 and transferred to the media A, B, and C of the fixed recording devices 61 to 63 through the transmission path 46 (step ST118). This data transmission operation is asynchronous with respect to the data transmission on the transmission path 13 formed on the data bus 2, that is, since both operations are independent, the data transmission operation on the transmission path 13 must be performed in parallel. Can be.

At this time, the device bus controller 50
Are fixed recording devices 61 to 6 by the method described in the conventional example.
3 is transmitted to each of the media A, B, and C. Normally, the speed of writing data to each of the fixed recording devices 61 to 63 is slower than the data transfer speed in the device bus 5, so each of the fixed recording devices 61 to 63 has a data buffer inside. The device bus controller 50 monitors the state of each of the fixed recording devices 61 to 63, and if the data buffer is full and cannot receive data, the data bus controller 50 transmits the data from the first bus buffer 81 until the data can be received. Stop reading temporarily.

The selection of the fixed recording devices 61 to 63 to which data is to be written is made by the CPU 20 and the device bus controller 50. For example, data writing is started from the fixed recording device 61, and a write end position unique to the fixed recording device 61 is set. The count value of the indicated REC pointer is added (step ST120). Next, it is determined whether or not the recording capacity of each of the media A, B, and C has a remaining amount. When the recording capacity of the recording medium A is full, data is written to the next recording medium B of the fixed recording device 62. Is performed (step ST122). When all of the media A, B, and C have run out, the process proceeds to step ST.
Proceeding to 124, it is determined whether to stop the recording mode (stop) or to perform overwrite recording (repeat). If the repeat recording is not performed, step ST1
Stop at 26. In the case of repeat recording, the process proceeds to step ST128 to reset the REC pointer, and controls to return to step ST104 to continue the recording mode.

The REC pointer is provided independently in each of the fixed recording devices 61 to 63 and the backup device 70, and indicates how many times the write cycle has been executed from the highest recording start position of the recording medium. It is shown. The value of the REC pointer is reset only when the content recorded on the recording medium is cleared, and is held otherwise. Now, assume that the value of the REC pointer is a and the amount of data actually written in one write cycle is b (for example, the first bus buffer 8).
Assuming that (capacity of 1 = constant value), the recording amount c of the data recorded on the medium is c = a × b.

Next, the operation of the backup system will be described. When a backup is designated during recording, the following series of backup operation cycles are performed in parallel during the recording operation.

FIG. 3 is a flowchart illustrating the backup mode according to the first embodiment.

In the video recording mode of the recording apparatus shown in FIG. 2, in step ST108, the data stored in the recording memory buffer 30 has a certain recording capacity X [M
B] If no data has been accumulated, the process proceeds to step ST150 in FIG. In step ST150, it is determined whether or not the first bus buffer 81 has a free area. If there is no free space in the first bus buffer 81, the process does not proceed to the backup mode, but proceeds to step S in the recording mode.
Returning to T116, the digital data is written to the fixed recording devices 61 to 63. First bus buffer 8
If there is an empty area in the CPU 1, the CPU 20 controls the selection switch 31 to prohibit data writing from the transmission path 34 to the first bus buffer 81 (step ST15).
2). However, even in this case, accumulation of data from the transmission path 13 to the recording memory buffer 30 is continued. After the data in the first bus buffer 81 has been transmitted to the fixed recording devices 61 to 63, the data transmission operation from the fixed recording devices 61 to 63 to the backup device 70 is permitted, and the backup operation is started. You.

As described in the conventional example, a backup pointer (B / U pointer) is added to the backup start position in the recorded contents of the fixed recording device 70 that matches the backup range, and how far data backup is performed Has been completed.

First, it is determined whether or not the transmission path 47 is in use (step ST154), and the device bus is read from the image data recorded in the fixed recording devices 61 to 63 from the position where the backup pointer is located. Controlled by the controller 50 (step ST15)
6). The read backup image data is transmitted by the buffer controller 40 through the transmission path 42 to the second
(Step ST15).
8).

After the writing of the backup image data to the second bus buffer 82 is completed, the buffer controller 40 determines whether or not the transmission path 46 is in use (step ST160). Then, when the transmission path 47 is not occupied by other data or devices,
The backup image data written earlier is read from the second bus buffer 82 through the transmission path 42, and the bus controller 50 sends the data to the backup device 70 through the transmission path 47 and writes the data to the removable medium 71 (step ST16).
2).

After the data transmission from the second bus buffer 82 to the backup device 70 is completed, the process proceeds to step ST164, where the count values of the backup pointer and the REC pointer of the backup device 70 are added. Next, in step ST166, it is determined whether or not the recording capacity of the removable medium 71 has a remaining amount, and when the recording capacity of the medium 71 is full, the backup mode is ended (step ST168).
If there is a remaining amount, control is performed such that the backup mode and the video recording mode are continued (step ST170).

The backup pointer is provided in the backup device 70 and indicates how many times the write cycle has been executed from the highest recording start position of the removable medium 71. The value of the backup pointer is cleared only when the contents recorded on the medium 71 are cleared and the backup operation is completed or stopped, and is held otherwise. Also, in the case of interruption of the backup operation at the time of media exchange described later, the value of the backup pointer is not cleared. Now, assuming that the value of the backup pointer is d and the amount of data actually copied from each of the media A, B, and C in one backup cycle is e (for example, the capacity of the second bus buffer 82 = constant value), the data is extracted. The recording amount f of the data recorded on the possible medium 71 is f = d × e.

Note that, in consideration of copying data in the opposite direction, that is, from the backup device 70 to the fixed recording devices 61 to 63, the backup pointer is set to the backup device 70 and the fixed recording devices 61 to 63. 63 need to be provided independently.

As described above, if the multi-media recording apparatus according to the first embodiment is configured, in the recording mode, the recording memory buffer 30 is used exclusively for storing video data.
Separately, a second bus buffer 82 dedicated to backup data is provided so that data transmission to each buffer can be performed asynchronously. Therefore, the video data stored in the fixed recording devices 61 to 63 can be backed up without stopping the video data recording operation. Also,
During the recording operation, the media 7
1 and then perform a media exchange operation such as insertion of a new media,
The side can continue recording. Therefore, after newly inserting the removable medium 71, it is possible to shift to the backup operation from the portion designated by the backup pointer,
There is an effect that video data can be recorded without leaking even during the media exchange time.

Embodiment 2 FIG. 4 is a flowchart for explaining the operation of the multiple media recording device according to the second embodiment. In the flowchart of the second embodiment,
Step S in the flowchart shown in FIG. 2 of the first embodiment
Although T100 to step ST116 are omitted, the process proceeds to step ST218 through similar steps.

In the first embodiment, while the digital video data recording mode is continued, the fixed recording devices 61 to 6
3 is repeatedly backed up. In the second embodiment, when the recording capacity of the removable medium attached to the backup device is smaller than the total recording capacity of the fixed recording device, the data amount to be recorded on the fixed recording device is equal to or less than the recording capacity of the removable medium in advance. Limited to

First, before inputting video data to be recorded, the CPU 20 checks the recording capacity of the removable medium 71. In this video recording mode, after the first image data is transferred to any one of the media A, B, and C of the fixed recording devices 61 to 63 via the transmission path 46 (step ST218), the count value of the REC pointer of the recording medium is reduced. It is added (step ST220). Next, the amount of data written to each of the media A, B, and C is compared with the recording capacity of the removable medium 71 (step ST222). Here, the amount of data recorded in the current fixed recording devices 61 to 63 is determined by the media 7 mounted on the backup device 70.
While the recording capacity is equal to or less than 1, the fixed recording devices 61 to 61
In order to continue the operation of writing data to 63, the process returns to step ST104. When the written data amount exceeds the recording capacity (X2) of the removable medium 71, it is determined whether to stop the recording mode (stop) or to perform overwrite recording (repeat) (step ST22).
4). If repeat recording is not performed, step ST
Stop at 226. When performing repeat recording, the process proceeds to step ST228, where the REC pointer is reset.
Step ST104 to continue the recording mode
It is controlled to return to.

Thus, in the apparatus of the second embodiment, even if the recording capacity of the removable medium 71 is small, all the contents of the recording data sent to the fixed recording devices 61 to 63 can be reliably backed up.

Embodiment 3 FIG. 5 is a flowchart for explaining the operation of the multiple media recording device according to the third embodiment. In the flowchart of the third embodiment,
Step S in the flowchart shown in FIG. 2 of the first embodiment
Although steps after T110 and steps after ST150 shown in FIG. 3 are omitted, steps ST310 of FIG. 5 are omitted.
Then, the same steps as those after step ST110 in FIG. 2 are executed.

In the first embodiment, the removable medium 71 is always mounted while the digital video data backup mode is being executed. In the third embodiment, when the recording medium is separated from the backup device (second recording means) 70, only the writing operation to the fixed recording devices (first recording means) 61 to 63 is continued. .

In FIG. 5, steps ST300 to ST310 correspond to steps ST100 to ST110 of FIG. 2 showing the video recording mode. In step ST308, it is determined whether or not data having a certain recording capacity X1 [MB] or more is stored in the recording memory buffer 30. If the recording capacity is equal to or less than the predetermined recording capacity, the process proceeds to step ST342, where the device bus controller 50 stores the media 7
It is determined whether or not 1 is mounted. Media 71
If not, the backup device 7
The REC pointer of 0 is reset (step ST34).
4) The process proceeds to Step ST310. At this time, the backup operation is interrupted until the medium 71 is mounted while the value of the backup pointer is held.

The medium 71 is stored in the backup device 70.
If is attached, the process proceeds to step ST346 to check whether or not a recordable unrecorded area remains in the medium 71. If there is no remaining space in the recording area, the backup mode is temporarily stopped, and the removable medium 71 is mounted as needed (step ST348). If there is a remaining space in the recording area, the process proceeds to the next step ST350, and it is determined whether or not there is a free area in the second bus buffer 82. Here, if there is no free area in the second bus buffer 82, step ST11 of the recording mode shown in FIG.
Returning to step 6, if there is a free area, step ST shown in FIG.
Proceeding to 152, the CPU 20 controls the selection switch 31 to prohibit data writing from the transmission path 34 to the first bus buffer 81.

In the third embodiment, the remaining amount of the medium 71 attached to the backup device 70 is checked in the backup mode shown in FIG.
T166) When it is determined that there is no remaining amount, the backup mode is temporarily stopped, and the removable medium 71 is replaced as needed.

As described above, in the device of the third embodiment,
Even when the recording medium is separated from the backup device as the second recording means, the fixed recording devices 61 to 6
Since the write operation to No. 3 is continued, backup can be reliably performed by the medium 71 mounted thereafter.

Embodiment 4 FIG. 6 is a flowchart for explaining the operation of the multiple media recording device according to the fourth embodiment. In the flowchart of the fourth embodiment,
Step S in the flowchart shown in FIG. 2 of the first embodiment
Steps after T114 are omitted, but steps after step ST414 in FIG. 6 execute the same steps as those after step ST114 in FIG.

In the first embodiment, the digital video data backup mode is executed in consideration of only the amount of data written to the recording memory buffer 30 in step ST108. However, if the transfer speed to the backup device 70 or the communication speed allowed by the transmission path 47 is lower than the writing speed to the fixed recording devices 61 to 63 (or the communication speed of the transmission path 46), the compression The image data transferred from the expansion block 10 to the recording memory buffer 30 may overflow.

In the fourth embodiment, after the digital video data 11 is written from the input / output terminal 1 to the recording memory buffer 30, the CPU 20 proceeds to step ST407.
It is determined whether the recording capacity remaining in the recording memory buffer 30 has become equal to or less than the predetermined recording capacity X0. If the recording capacity is equal to or smaller than the predetermined recording capacity X0, step ST408 is not executed and step S408 is executed.
Proceed to T410. That is, the overflow in the recording memory buffer 30 is prevented by giving priority to the recording operation without determining whether to proceed to the backup mode (step ST408). In the recording mode, in step ST407, the remaining capacity of the recording memory buffer 30 is repeatedly checked, and when the remaining capacity exceeds a predetermined recording capacity X0, the backup mode is restarted.

As described above, in the device of the fourth embodiment,
Since the time division control is performed by giving priority to the write operation in the fixed recording devices 61 to 63 over the transfer operation to the backup device 70, there is no possibility that the recording of the video data is lost.

The apparatus according to each of the above embodiments has been described as recording digital video data input at a constant rate. However, the present invention can be similarly applied to digital data transmitted continuously in time.

[0082]

Since the present invention is configured as described above, it has the following effects.

According to a first aspect of the present invention, there is provided a multi-media recording apparatus for recording digital data on a plurality of types of recording media, wherein an input terminal to which digital data is continuously supplied, an input terminal and a data bus. A first recording means connected via the first recording means, and a second recording means to which digital data read from the first recording means is transferred.
Recording means, and control means for time-divisionally controlling the operation of writing digital data to the recording medium of the first recording means and the operation of transferring the data from the first recording means to the recording medium of the second recording means. Therefore, it is possible to create backups using multiple media with different recording transfer speeds, including backup media, without setting the time required for backup and without impairing the high-speed responsiveness required for recording such as event recording. Will be possible.

In the multi-media recording apparatus according to the second aspect, the second recording means has a recording medium larger than the recording capacity of the recording medium of the first recording means. When the recording capacity is exceeded, endless transition to the overwriting operation allows the second recording means to reliably perform backup recording.

In the multi-media recording apparatus according to the third aspect, since the second recording means includes a separable recording medium, long-time digital data can be reliably backed up.

According to the fourth aspect of the present invention, since the first recording means is provided with the backup pointer indicating the range of the digital data which has been transferred to the second recording means, the first recording means is provided with the backup pointer according to the backup pointer. 2
By controlling the transfer operation to the recording means, the video data can be recorded without leakage even during the medium exchange time.

In the multi-media recording apparatus according to the fifth aspect, even when the recording medium of the second recording means has a smaller recording capacity than the recording medium of the first recording means, the second recording means is provided. By limiting the amount of writable digital data in the first recording means in accordance with the recording capacity of the recording medium, long-term digital data can be reliably backed up.

In the multiple media recording apparatus according to the sixth aspect, when the recording medium is separated from the second recording means, only the writing operation of the first recording means is continued.
Digital data input during the media exchange time can be reliably recorded.

In the multi-media recording apparatus according to the present invention, when the recording capacity of the recording medium of the first recording means is exceeded, the operation shifts to the overwriting operation, and the recording of the recording medium provided in the second recording means is performed. Since the transfer operation is continued until the capacity is reached, the second recording means can reliably perform backup recording.

In the multi-media recording apparatus according to the present invention, the write operation by the first recording means is performed in a time-division manner with priority given to the transfer operation, so that recording of video data may be lost. Disappears.

[0091] According to a ninth aspect of the present invention, there is provided a multi-media recording apparatus comprising: a first buffer memory for temporarily storing digital data written by the first recording means; and a digital data temporarily read from the first recording means. Since the buffer control means having the second buffer memory for storing data is provided, even when recording devices having significantly different transfer rates at the time of recording are combined, high-speed response at the time of recording is not impaired.

A multi-media recording apparatus according to claim 10, wherein a compression means for compressing digital data between the input terminal and the first recording means, and a third buffer memory for temporarily storing the compressed data. And means for controlling the transfer of the data stored in the third buffer memory. During data transfer from the first recording means to the second recording means, the first buffer means Since the data transfer to the memory is stopped, the transfer of digital data from the third buffer memory can be stopped during the backup, and the backup operation can be performed reliably.

[0093] The multi-media recording device according to the eleventh aspect monitors the amount of data stored in the third buffer memory, and when the amount of data exceeds a predetermined recording capacity, the second recording means. The transfer of data from the third buffer memory to the first buffer memory is restarted by stopping the data transfer to the first buffer memory, so that there is no risk of missing video data recording.

According to a twelfth aspect of the present invention, the transfer rate of digital data to the third buffer memory is set to the first or second buffer memory or the first or second buffer memory.
Even if the transfer rate to the second recording means is lower,
A similar effect is achieved.

In the multi-media recording apparatus according to the thirteenth aspect, the same effect can be obtained even if the digital data is digital video data input at a constant rate.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a multi-media recording apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a flowchart showing a recording operation in the multiple media recording device of the first embodiment.

FIG. 3 is a flowchart showing a backup operation in the multiple media recording device of the first embodiment.

FIG. 4 is a flowchart showing an operation of the multiple media recording device according to the second embodiment of the present invention.

FIG. 5 is a flowchart showing an operation of the multiple media recording device according to the third embodiment of the present invention.

FIG. 6 is a flowchart showing an operation of the multiple media recording device according to the fourth embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a conventional device of the present invention.

FIG. 8 is a flowchart showing the operation of the conventional device.

FIG. 9 is a flowchart showing a backup operation of the conventional device.

[Explanation of symbols]

1 digital video data input / output terminal, 2 data bus, 5 device bus, 10 compression / decompression block, 11 digital video data (uncompressed), 12
Digital video data (after expansion), 13 transmission paths,
20 CPU, 30 recording memory buffer, 31
Selection switch, 34 transmission path, 40 buffer controller, 41 transmission path, 42 transmission path,
46 transmission paths, 47 transmission paths, 48 transmission paths,
50 device bus controller, 61 fixed recording device, 62 fixed recording device, 63 fixed recording device, 70 backup device, 71
Ejectable media, 80 bus buffer, 8
1 First bus buffer, 82 Second bus buffer.

Claims (13)

[Claims] 1. A multi-media recording apparatus for recording digital data on a plurality of types of recording media, comprising: an input terminal to which the digital data is continuously supplied; and a first terminal connected to the input terminal via a data bus. Recording means; digital data read from the first recording means; second recording means to which digital data is transferred; writing operation of digital data to a recording medium by the first recording means; From the recording means of the second
And a control means for performing time-division control of the transfer operation of the recording means to the recording medium. 2. The apparatus according to claim 1, wherein the second recording device includes a recording medium having a recording capacity larger than a recording capacity of the recording medium of the first recording device. 3. The multi-media recording apparatus according to claim 1, wherein the second recording unit includes a separable recording medium. 4. The first recording means includes a backup pointer indicating a range of digital data which has been transferred to the second recording means, and performs a transfer operation to the second recording means in accordance with the backup pointer. The multi-media recording apparatus according to claim 1, wherein the apparatus is controlled. 5. The recording means provided in the second recording means when the recording medium of the second recording means has a smaller recording capacity than the recording medium of the first recording means. 5. The multi-media recording apparatus according to claim 1, wherein the amount of writable digital data in said first recording means is limited according to the recording capacity of the medium. . 6. The multiple media according to claim 3, wherein when the recording medium is separated from the second recording unit, only the writing operation of the first recording unit is continued. Recording device. 7. The first recording means shifts to an overwriting operation when the recording capacity of the recording medium is exceeded, and a transfer operation until the recording capacity of the recording medium of the second recording means is reached. The multi-media recording apparatus according to claim 1 or 2, wherein: 8. The multiple media according to claim 1, wherein the control unit performs time-division control in which a write operation in the first recording unit is prioritized over a transfer operation. Recording device. 9. A first buffer memory for temporarily storing digital data written by said first recording means, and a second buffer memory for temporarily storing digital data read from said first recording means. The multi-media recording apparatus according to claim 1, further comprising a buffer control unit having: 10. A compression means for compressing digital data between said input terminal and said first buffer memory, a third buffer memory for temporarily storing the compressed data, and said third buffer memory. Means for controlling transfer of data stored in the first buffer memory during transfer of data from the first recording means to the second recording means. 10. The multiple media recording device according to claim 9, wherein data transfer is stopped. 11. A data amount stored in the third buffer memory is monitored, and when the data amount exceeds a predetermined recording capacity, data transfer to the second recording means is stopped. 11. The multi-media recording apparatus according to claim 9, wherein data transfer from the third buffer memory to the first buffer memory is restarted. 12. A transfer rate of digital data to said third buffer memory is lower than a transfer rate to said first and second buffer memories or said first and second recording means. The multiple media recording device according to claim 9. 13. The multiple media recording apparatus according to claim 1, wherein the digital data is digital video data input at a constant rate.