JP2002369141A - Digital image recorder/reproducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device which causes non-reproduced images over a long time even if a certain recording means cannot be reproduced, by overcoming the situation that, in a device which records image data in higher priority of a plurality of record means when images caught by a monitoring camera are recorded over the long time, and which sequentially records data in a next recording means at a point of time when a recordable region disappears, when the certain recording means cannot reproduce, as non-reproduced image is caused for the long time, there is a problem as a security monitor. SOLUTION: Image data caught by a camera is compacted by a compression/ decompression block 1 and further frame data FLAD obtained by subdividing in units of 'frame' is formed. A frame data column FLAD is further grouped in each of F 'frame', and finally the F 'frame' of the odd numbered group is sequentially recorded into a first fixing record device, and further the F 'frame' of the even numbered group is sequentially recorded into a second fixed recording device 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for recording a digitized video signal or the like on a predetermined recording device, and more particularly to a digital signal suitable for monitoring video recording for recording on a plurality of recording devices. The present invention relates to a video recording / reproducing device.

[0002]

2. Description of the Related Art A monitoring video recording apparatus requires a function of continuously recording for 24 hours. Furthermore, when used in industries such as banks, data recorded by administrative guidance is required to be kept for a certain period of time, so digital data is recorded on a recording medium that can be taken out from the monitoring video recording device, Preferably, it can be stored as a library.

[0003] In a general monitoring digital recording device, as a real-time video recording device, it has excellent high-speed response, can cope with a mode in which recording is started immediately by a sudden alarm input, and is relatively large. The fixed type rotating disk type drive capable of securing the capacity is mainly selected. On the other hand, the types of recording media that can be taken out include rotating disk type media such as MO and DVD-RAM, which are characterized by high-speed response, and DAT and D, which are characterized by large-capacity recording.
A helical scan type digital recording tape type medium such as a VC can be roughly classified into two types.

FIG. 5 is a block diagram showing a main configuration of a conventional monitoring digital video recording device 55. As shown in FIG.

In FIG. 1, reference numeral 21 denotes a compression / expansion processing block for compressing / expanding digital video data input / output via the input / output terminal 21a. Reference numeral 2 denotes a recording memory buffer for temporarily recording digital data compressed by the compression / decompression processing block 21. Reference numeral 3 denotes a selection switch for selecting whether or not to transmit the digital data in the recording memory buffer 2 to the buffer controller 25. I do.

Reference numeral 24 denotes a CPU for controlling data transmission between blocks in the entire system. A data transmission path is formed by the data bus 10 between the compression / decompression processing block 21, the recording memory buffer 2, the buffer controller 25, and the CPU 24. 8 and 9 are
First and second recording of predetermined digital data respectively
And is formed of, for example, a hard disk device.

A device data bus 11 forms a data transmission path between the fixed recording devices 8 and 9 and the buffer controller 25. Reference numeral 27 denotes a bus controller for controlling the flow of data in the device data bus 11 in accordance with a command from the CPU 24. Reference numeral 22 denotes a buffer controller 25.
Is a bus buffer that is connected to a predetermined data bus and temporarily stores data as needed according to a command from the buffer controller 25.

[0008] The recording operation of the conventional monitoring digital video recording apparatus having the above-described main configuration will be described below.

A video signal obtained by converting a subject of a camera (not shown) into an electric signal is converted into digital video data by a video decoder (not shown). The converted digital video data is sent from the input / output terminal 21a to the compression / decompression processing block 21 as digital video input data DPID, subjected to compression processing, and divided into W bytes (by
te: hereinafter referred to as [B]) The compressed data COMD is sent to the recording memory buffer 2 as compressed data COMD, and is temporarily stored here.

When data equal to or larger than the threshold recording amount X [MB] is accumulated in the recording memory buffer 2, the selection switch 3 detects this, and the block data BLKD for one transmission block of a predetermined Y [KB] is detected. Is sent from the recording memory buffer 2 to the buffer controller 25, and is stored in the buffer controller 25. The buffer controller 25 temporarily stores the block data BLKD in the bus buffer 22 as necessary, and holds the block data BLKD until it is recorded in the fixed recording devices 8 and 9 as described later.

As described above, the data temporarily stored in the recording memory buffer 2 is stored in the CPU 24 and the selection switch 3.
When the bus buffer 22 is in a state in which data is stored in the recording memory buffer 2 with a predetermined threshold recording amount X [MB] or more and the bus buffer 22 is in a state where data can be written, Y [KB]
The block data BLKD for one transmission block is sent to the buffer controller 25 via the transmission path of the data bus 10, and further written to the bus buffer 22 as needed.

As described above, when recording video data from the outside, the block data BLKD as image data is written into the bus buffer 22, and the buffer controller 25 occupies each transmission path with other data and devices. If not, the image data is read out from the bus buffer 22 and sent to the fixed recording devices 8 and 9 via a predetermined transmission path, as described later.

Next, the video data stored in the bus buffer 22 is transferred to the first and second video data via the device data bus 11.
The operation of selectively transferring data to the fixed recording devices 8 and 9 for recording will be described.

This data transfer is controlled by the CPU 24 and the bus controller 27. Normally, the data writing speed to each of the fixed recording devices 8 and 9 is lower than the data transfer speed in the device data bus 11. Therefore, each of the fixed recording devices 8, 9 has internal data buffers 8a, 9a for temporarily storing recording data. The bus controller 27 monitors the status of each of the fixed recording devices 8 and 9 and if the internal data buffer 8
If a and 9a are full and data cannot be received, the reading of data from the bus buffer 22 is temporarily stopped until the data can be received.

The CPU 24 and the bus controller 2
7 selects a fixed recording device to which data is to be written from the two fixed recording devices 8 and 9 and starts writing data from one of them, for example, the first fixed recording device 8, until the writing capacity is full. At the stage where the writing of the data has been completed, control is performed so that the writing of data to the other second fixed recording device 9 is started. Here, the fixed recording device refers to a recording means, such as a hard disk drive, having a configuration in which a recording medium cannot be taken out by a user.

Further, the CPU 24 and the buffer controller 25 monitor the state of the bus buffer 22, and when a fixed amount of data has been sent to each of the fixed recording devices 8, 9, the data bus 10 is again transferred from the recording memory buffer 2 to the data bus 10. The writing of image data to the bus buffer 22 through the transmission path is started. Thereafter, similarly, the bus buffer 2
2 and transfer of data to each fixed recording device 8, 9;
And writing are repeated.

FIG. 6 is an explanatory diagram schematically showing a flow of data transmitted as described above and recorded in each of the fixed recording devices 8 and 9.

As shown in FIG.
A1, B1, C1 {An, Bn, Cn} output from the buffer controller 25 and the bus buffer 22 are a block data (BLKD) sequence divided into blocks for each Y [KB]. The first and second fixed recording devices 8, temporarily stored in the data buffer means,
9

At that time, first, a check is made of a recordable empty area with respect to a device having a higher recording priority order, in this case, the first fixed recording device 8, and continuous data transfer to a recordable area is performed. Writing is performed. In the example of FIG. 6, it is shown that the continuous A, B1, C1 ‥‥‥‥ A50, B50, and C50 BLKD sequences are recorded in the first fixed recording device 8.

Next, at the stage when the recording in the recordable area of the first fixed recording device 8 is completed, a free area recordable in the second fixed recording device 9 having the next highest recording priority. Is checked. Then, in the recordable area, a BLCK sequence of A51, B51, C51 # is recorded following the BLDK sequence recorded on the first fixed recording device 8 as shown in FIG.

When there is no more recordable area up to the recording device with the lowest recording priority, the recording operation is terminated, or the operation returns to the first recording device with the highest priority.
Continuous overwriting is started.

[0022]

As described above, in the conventional monitoring digital video recording apparatus, video data having continuous video elapsed time is sequentially recorded on a plurality of recording devices having a predetermined recording priority. Therefore, the video data recorded in each recording device has a different time lapse area of the video lapse time. For this reason, when a failure occurs in a certain recording device and the video data recorded in the recording device is lost, all the video data corresponding to a certain time region of the video elapsed time in the recorded video data is lost. There is a problem that the information is lost and the video in the time domain cannot be reproduced.

The present invention solves the above-mentioned problem, prevents a situation in which reproduction of a specific video elapsed time area cannot be performed even if a failure occurs in one recording device, and reduces the entire time area of the recorded video elapsed time. It is an object of the present invention to provide a video recording / reproducing device capable of continuous reproduction over a wide range.

[0024]

According to a first aspect of the present invention, there is provided a digital video recording / reproducing apparatus for recording / reproducing digital video data, the digital video recording / reproducing apparatus comprising: A signal processing unit for converting a video data sequence into a video data sequence; a plurality of data recording / reproducing means for recording / reproducing different video data of the video data sequence; Data transmission means for grouping and sequentially distributing the data to the plurality of data recording / reproducing means, wherein the plurality of data recording / reproducing means respectively record the distributed video data.

The digital video recording / reproducing apparatus according to claim 2 is
2. The digital video recording / reproducing apparatus according to claim 1, wherein the data transmission means arranges each video data reproduced by the plurality of data recording / reproduction means at the time of data reproduction so as to conform to the video data sequence. Features. According to a third aspect of the present invention, there is provided the digital video recording / reproducing apparatus according to the second aspect, wherein, among the plurality of data recording / reproducing means, a data recording / reproducing means that cannot perform recording or reproduction occurs. The data is reproduced in a state where the video data distributed to the data recording / reproducing means is missing. Claim 4
4. The digital video recording / reproducing apparatus according to claim 3, wherein the number of said data recording / reproducing means is two, and the video data of the odd-numbered respective groups of the video data sequence is one of the digital video recording / reproducing apparatuses. The data recording / reproducing means is configured to record the video data of each even-numbered group in the other data recording / reproducing means.

According to a fifth aspect of the present invention, in the digital video recording / reproducing apparatus of the third aspect, the digital video recording / reproducing apparatus further includes signal multiplexing / demultiplexing means for multiplexing a plurality of streams of video information to obtain the digital video recording / reproducing apparatus. It is characterized in that data is generated and data reproduced at the time of reproduction is separated for each of the plurality of systems. A digital video recording / reproducing apparatus according to claim 6 is the digital video recording / reproducing apparatus according to any one of claims 1 to 5, wherein the data recording / reproducing means is a fixed recording device. . According to a seventh aspect of the present invention, in the digital video recording and reproducing apparatus according to the third aspect, the video data unit is a frame unit. Further, the digital video recording / reproducing apparatus according to claim 8 is a digital video recording / reproducing apparatus according to claim 7.
In the digital video recording and reproducing apparatus described above, the predetermined number F is set to correspond to a predetermined recording time. Further, a digital video recording / reproducing apparatus according to claim 9 is the digital video recording / reproducing apparatus according to claim 7, wherein the predetermined number F is set to correspond to a predetermined data amount.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram showing a main configuration of a digital video recording apparatus for monitoring based on a digital video recording / reproducing apparatus according to a first embodiment of the present invention.

The monitoring digital video recording apparatus 1 shown in FIG.
Reference numeral 1 denotes a compression / decompression processing block corresponding to a signal processing unit, which compresses / decompresses digital video data input / output via its input / output terminal 1a. Reference numeral 2 denotes a recording memory buffer for temporarily recording the digital data compressed by the compression / decompression processing block 1. Reference numeral 3 denotes a selection switch for selecting whether to transmit the digital data in the recording memory buffer 2 to the buffer controller 5. I do.

Reference numeral 4 denotes a CPU for controlling data transmission between blocks of the entire system. A data transmission path is formed by a data bus 10 between the compression / decompression processing block 1, the recording memory buffer 2, the buffer controller 5, and the CPU 4. Reference numerals 8 and 9 denote first and second fixed recording devices for recording predetermined digital data, respectively, which correspond to data recording / reproducing means, and are formed by a hard disk device, for example.

Reference numeral 11 denotes a device data bus which forms a data transmission path between the fixed recording devices 8, 9 and the buffer controller 5. Reference numeral 7 denotes a bus controller for controlling the flow of data in the device data bus 11 in accordance with a command from the CPU 4. Reference numerals 13 and 14 are connected to the buffer controller 5 via a predetermined data bus.
First, data is temporarily saved as required by the first command
And a second bus buffer.

Incidentally, the recording memory buffer 2, the selection switch 3, the CPU 4, the buffer controller 5, the first and the second
Of the buffers 13 and 14 and the bus controller 7 correspond to data transfer means.

Embodiment 1 of the Main Part Configuration As Above
Is different from the conventional monitoring digital video recording device 55 shown in FIG. 5 mainly in that two bus buffers 13 and 14 are provided in the buffer controller 5. Points and a data recording / reproducing processing method executed by the compression / expansion processing block 1, the CPU 4, the buffer controller 5, and the bus controller 7, and the operation thereof will be described below.

A video signal obtained by converting a subject of a camera (not shown) into an electric signal is converted into digital video data through a video decoder (not shown). The converted digital input video data DPID is sent from the input / output terminal 1a to the compression / decompression processing block 1 and subjected to compression processing. The compressed data is subdivided into units of [frames] and recorded as frame data FLAD corresponding to an image data sequence in the recording memory buffer 2.
And updates the management information in the recording memory buffer 2.

As described above, the recording memory buffer 2
The frame data FLAD temporarily stored in the bus buffer 1 is managed by the CPU 4 and the selection switch 3 and is accumulated in a predetermined threshold recording amount X [MB] or more.
When the data can be written to the bus controllers 3 and 14, the data is sent to the buffer controller 5 via the transmission path of the data bus 10 and written to the bus buffers 13 and 14.

At this time, the frame data sequence FLAD is grouped for each F [frame] as described below, and the F [frames] of the odd-numbered groups are sequentially stored in the first bus buffer 13 and the even-numbered groups. F [frame] are sequentially written to the second bus buffer 14, respectively.

FIG. 2 is an explanatory diagram schematically showing the flow of data transmitted as described above and recorded in each of the bus buffers 13 and 14.

As shown in FIG.
A1, B1, C1 {An, Bn, Cn} are output from the F [frame] of each odd-numbered group as described above.
A1, B1, C1, A3, B3, C3, A5, B5, C
, A7} are sequentially written to the first bus buffer 13, and the columns of F [frames] of each even-numbered group are: A2, B2, C2, A4, B4, C4, A6, B6, C
6, A8} are sequentially written to the second bus buffer 14.

Here, F of F [frame] is set to F = 3, and frame data FLAD is represented by the notation of “{An, Bn, Cn}” (n is a positive integer). I have.

As described above, at the time of recording video data from the outside, the frame data FLAD as the image data is written into each of the bus buffers 13 and 14, and the buffer controller 5 determines that each transmission path has another data or device. When the image data is not occupied, the image data is read from the bus buffers 13 and 14 as described later, and the data is transferred to the fixed recording devices 8 and 9 via a predetermined transmission path.

This data transfer is controlled by the CPU 4 and the buffer controller 7, and the image data of the first bus buffer 13 is transferred to the first fixed recording device 8 and the second bus buffer 14 as shown in FIG. Is sent to the second fixed recording device 9.

Normally, the data write speed to each of the fixed recording devices 8 and 9 is lower than the data transfer speed in the device data bus 11. Therefore, each of the fixed recording devices 8, 9 has internal data buffers 8a, 9a for temporarily storing recording data. The bus controller 7 monitors the status of each fixed recording device 8, 9,
If the internal data buffer is full and data cannot be received, data reading from the bus buffers 13 and 14 is temporarily stopped until the data can be received.

Further, the CPU 4 and the buffer controller 5 monitor the state of the bus buffers 13 and 14, and when a certain amount of data has been sent to each of the fixed recording devices 8 and 9, the data is again stored in the recording memory buffer 2. Bus 10
Then, writing of image data to each bus buffer through the transmission path is started.

Thereafter, similarly, bus buffers 13, 1
4 and the writing of data to the fixed recording devices 8 and 9 are repeated. Here, each bus buffer 13, 1
4 may be set based on a predetermined data capacity or a predetermined image time.

Next, the operation of reproducing video data recorded in each of the fixed recording devices 8 and 9 in accordance with a command from the CPU 4 will be described.

In this case, the video data recorded in the fixed recording devices 8 and 9 are alternately taken out every F [frame] (F = 3) data. The alternately extracted video data is returned to the frame data (FLAD) sequence shown in FIG. 2 in which the video at the time of reproduction is continuous in time series, and is compressed via the transmission paths of the data buses 11 and 10. The data is transmitted to the decompression processing block 1.

The digital video output data DPOD which is formed by expansion processing in the compression / expansion processing block 1 and is continuous in time is supplied to the input / output terminal 1 of the compression / expansion processing block 1.
a to an external image display unit such as a display (not shown).

When a failure occurs in one of the two fixed recording devices 8 and 9, video data is recorded and reproduced only by the normal fixed recording device. Will be The digital video output data DPOD output at this time has a data amount that is half the data amount of the input digital video input data DPID, but F [frames] (in this embodiment, F
= 3) The image is reproduced as an intermittent image in which the image is lost every time.

As described above, according to the monitoring digital video recording apparatus of the first embodiment, even if one of the two fixed recording devices fails and the recording / reproducing function does not work, Although the reproduced video is intermittent, it is possible to prevent the recorded video from being lost for a long time. Therefore, even if an unexpected situation occurs in which one of the fixed recording devices breaks down, the purpose of the monitoring device can be sufficiently achieved.

Embodiment 2 FIG. 3 is a block diagram showing a configuration of a main part of a second embodiment of a monitoring digital video recording device based on the digital video recording / reproducing device of the present invention.

The monitoring digital video recording device 17 of the second embodiment is mainly different from the monitoring digital video recording device 15 of the first embodiment shown in FIG. This is a data recording / reproducing processing method controlled by the CPU 4. Therefore, components that are the same as or correspond to those of the monitoring digital video recording device 15 of the first embodiment are given the same reference numerals, description thereof will be omitted, and different points will be mainly described.

The compression / decompression processing block 18 has two input / output terminals 18a and 18b, and the inside thereof is composed of a signal demultiplexing section 18c and a signal compression / decompression section 18d.

Digital input video data DPID1 formed by a first camera (not shown) and a video decoder is
From the first input / output terminal 18a to the compression / decompression processing block 18
To the signal demultiplexing unit 18c. On the other hand, digital input video data DPID2 formed by a second camera and a video decoder (not shown) is supplied to a second input / output terminal 18b.
From the signal demultiplexing section 18c of the compression / decompression processing block 18.
Sent to

The digital input video data sent to the signal demultiplexing section 18c is multiplexed, reaches the signal compression / decompression section 18d, is signal-compressed and subdivided, and is divided into [frames] corresponding to an image data sequence. The frame data is sent to the recording memory buffer 2 as frame data FLADD, temporarily stored, and the management information of the recording memory buffer 2 is updated.

The frame data FLADD temporarily stored in the recording memory buffer 2 is transmitted to the CPU 4 and the selection switch 3.
Is transmitted to the buffer controller 5 via the transmission path of the data bus 10 when the data is stored in the bus buffers 13 and 14 in a state where the data is accumulated over a predetermined threshold recording amount X [MB] and the bus buffers 13 and 14 can write data. Bus buffer 1
3, 14 are written.

At this time, the frame data string FLADD is grouped by F [frames] as described below, and the F [frames] of the odd-numbered groups are sequentially stored in the first bus buffer 13.
Further, F [frames] of the even-numbered groups are sequentially written to the second bus buffer 14, respectively.

FIG. 4 is an explanatory diagram schematically showing a flow of data transmitted as described above and recorded in each of the bus buffers 13 and 14.

As shown in FIG.
Of frame data (FLADD) output from a, aA1, aB1, aC1, bA1, bB1, bC1 ‥‥‥‥ b
An, bBn, bCn, bAn, bBn, bCn} are, as described above, F [frames] of each odd-numbered group.
AA1, aB1, aC1, bA1, bB1, bC1, aA3, a
B3, aC3, bA3, bB3, bC3, aA5, aB5, a
C5, bA5, bB5, bC5, aA7} are sequentially written to the first bus buffer 13, and a sequence of F [frames] of each even-numbered group, aA2, aB2, aC2, bA2, bB2, bC2, aA4, a
B4, aC4, bA4, bB4, bC4, aA6, aB6, a
C6, bA6, bB6, bC6, aA8} are sequentially written to the second bus buffer 14.

Here, F of F [frame] is set to F = 3, and “‥ aAn, aBn, aCn, bAn, bB
(n is a positive integer) represents frame data FLADD, and the data whose first character is a is the first input / output terminal 18 of the compression / decompression processing block 18.
a indicates that the data is based on the digital video input data DPID1 input from a, and the data whose first character is b is the second input / output terminal 18 of the compression / decompression processing block 18.
b indicates that the data is based on the digital video input data DPID2 input from b.

Thereafter, the image data of the first bus buffer 13 is transferred to the first fixed recording device 8 and the image data of the second bus buffer 14 is transferred to the second fixed recording device 9.
Are sequentially transmitted in the same manner as in the first embodiment, and a description thereof will be omitted.

Next, the operation of reproducing video data recorded in each of the fixed recording devices 8 and 9 in accordance with an instruction from the CPU 4 will be described.

In this case, the video data recorded on the fixed recording devices 3 and 4 are alternately taken out every F [frame] (F = 3) data. The alternately extracted video data is returned to the frame data (FLADD) sequence shown in FIG. 4 in which the reproduced images are chronologically continuous, and compressed via the transmission paths of the data buses 11 and 10. The data is transmitted to the decompression processing block 18.

The signal is decompressed by a signal compression / decompression section 18d of the compression / decompression processing block 18, and further demultiplexed by a signal demultiplexing section 18d.
c, each digital video output data D formed separately
The POD1 and the DPOD2 are output as temporally continuous signals from the input / output terminals 18a and 18b to an external image display unit such as a display (not shown).

If a failure occurs in one of the two fixed recording devices 8 and 9, the recording and reproduction of video data is performed only by the normal fixed recording device. Will be Each digital video output data DPOD1 and DPO output at this time
The data amount of D2 is half of the data amount of each of the input digital video input data DPID1 and DPID2, but F [frame] (F = 3 in the present embodiment).
The video is reproduced as an intermittent video that is lost every time.

As described above, according to the surveillance digital video recording device of the second embodiment, in a device provided with two surveillance cameras, one of the two fixed recording devices fails. Even when the recording / reproducing function does not work, the reproduced video captured by each camera is intermittent, but the recorded video can be prevented from being lost for a long time. Therefore, even if an unexpected situation occurs in which one of the fixed recording devices breaks down, the purpose of the monitoring device can be sufficiently achieved.

In the above-described embodiment, two fixed recording devices are provided as data recording means. However, the present invention is not limited to this. Two or more fixed recording devices are prepared and each fixed recording device is prepared. You may comprise so that video data may be distributed to a recording device sequentially.

Further, in the surveillance digital video recording apparatus according to the second embodiment, the number of surveillance cameras is two. However, the present invention is not limited to this, and the surveillance digital video recording apparatus may be composed of two or more surveillance cameras. It can take various aspects such as

[0067]

According to the digital video recording / reproducing apparatus of the first aspect, video data within the same video recording time is sequentially sorted and recorded on a plurality of data recording / reproducing apparatuses. As long as this is not the case, it is possible to prevent video information that is continuous for a long time from being lost from the recorded information within the video recording time.

According to the digital video recording / reproducing apparatus of claim 2, in the digital video recording / reproducing apparatus of claim 1,
Normal recording and reproduction of video becomes possible.

According to the digital video recording / reproducing apparatus of claim 3, in the digital video recording / reproducing apparatus of claim 2,
As long as all the data recording / reproducing devices do not fail, it is possible to prevent continuous loss of video from the reproduced video for a long time, so that a digital video recording / reproducing device suitable for use in crime prevention can be provided.

According to the digital video recording / reproducing apparatus of the fourth aspect, a digital video recording / reproducing apparatus having the same effect as the apparatus of the third aspect can be provided with the minimum necessary components.

According to the digital video recording / reproducing apparatus of the fifth aspect, the digital video recording / reproducing apparatus having the same effect as the apparatus of the third aspect can be obtained even when recording / reproducing video of another system captured by a plurality of cameras. Can be provided.

According to the digital video recording / reproducing apparatus of the present invention, since the apparatus can be excellent in the high-speed response of the recording / reproducing operation, it is possible to promptly respond to a recording command by a sudden alarm input. Becomes

According to the digital video recording / reproducing apparatus of the seventh to ninth aspects, the reproduced video when the data recording / reproducing apparatus breaks down becomes an intermittent video, but this intermittent characteristic is optimized according to various conditions. It can be.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a main configuration of a monitoring digital video recording apparatus according to a first embodiment of the present invention based on a digital video recording / reproducing apparatus.

FIG. 2 is an explanatory diagram schematically showing a flow of data recorded in each of bus buffers 13 and 14.

FIG. 3 is a block diagram showing a configuration of a main part of a second embodiment of a monitoring digital video recording device based on the digital video recording / reproducing device of the present invention.

FIG. 4 is an explanatory diagram schematically showing a flow of data recorded in each of the bus buffers 13 and 14.

FIG. 5 is a block diagram showing a configuration of a main part of a conventional monitoring digital video recording device.

FIG. 6 is an explanatory diagram schematically showing a flow of data recorded in each of the fixed recording devices 8 and 9 in the conventional apparatus.

[Explanation of symbols]

1 compression / expansion processing block, 1a input / output terminal, 2
Recording memory buffer, 3 selection switch, 4C
PU, 5 buffer controller, 7 bus controller, 8 first fixed recording device, 8a internal data buffer, 9 second fixed recording device,
9a Internal data buffer, 10 data bus, 1
Reference Signs List 1 device data bus, 13 first bus buffer, 14 second bus buffer, 15 monitoring digital video recording device, 17 monitoring digital video recording device, 18 compression / decompression processing block, 18a first input / output terminal, 18b Second input / output terminal, 18c
Signal demultiplexing section, 18d signal compression / decompression section, 21 compression / decompression processing block, 21a input / output terminal, 22 bus buffer, 24 CPU, 25 buffer controller, 27 bus controller, 55 digital video recording device for monitoring.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G11B 27/034 H04N 7/18 U H04N 5/76 5/92 H 5/765 5/781 510E 5/781 510Z 5 / 915 5/91 K 5/93 L 5/937 5/93 Z 7/18 C G11B 27/02 K F term (reference) 5C052 AA01 AB02 CC11 DD04 FA01 5C053 FA11 FA23 GA11 GB01 GB21 HA31 KA04 KA24 LA01 5C054 AA01 AA05 CC02 CH01 EA07 GA01 GB01 HA01 HA18 5D044 AB07 BC01 CC05 DE02 DE03 DE12 DE13 DE63 DE72 DE94 DE96 GK05 GK08 5D110 AA13 AA21 AA29 BB23 BB24 BC05 CA05 CA42 CL01

Claims (9)

[Claims] 1. A digital video recording / reproducing apparatus for recording / reproducing digital video data, comprising: a signal processing unit for converting the digital video data into a video data sequence in a predetermined video data unit which is continuous in time series; Record different video data of video data sequence /
A plurality of data recording / reproducing means for reproducing; and a data transmitting means for grouping the video data sequence into a predetermined number F of video data and sequentially distributing the plurality of data to the plurality of data recording / reproducing means. A digital video recording / reproducing apparatus, wherein the means records the video data thus distributed. 2. The data transmission means according to claim 1, wherein at the time of data reproduction, each video data reproduced by said plurality of data recording / reproduction means is arranged in accordance with said video data sequence. Digital video recording and playback device. 3. The plurality of data recording / reproducing means,
3. The digital video recording / reproducing apparatus according to claim 2, wherein when data recording / reproducing means which cannot be recorded or reproduced occurs, the data reproducing is performed in a state where video data allocated to the data recording / reproducing means is missing. apparatus. 4. The number of said data recording / reproducing means is 2,
In the video data sequence, odd-numbered video data of each group is recorded in one of the data recording and reproducing means, and even-numbered video data of each group is recorded in the other data recording and reproducing means. 4. The digital video recording / reproducing apparatus according to claim 3, wherein: 5. A signal multiplexing / demultiplexing means for multiplexing video information of a plurality of systems to generate the digital video data and separating data reproduced at the time of reproduction for each of the plurality of systems. 4. The digital video recording / reproducing apparatus according to claim 3, wherein: 6. The digital video recording / reproducing apparatus according to claim 1, wherein said data recording / reproducing means is a fixed recording device. 7. The digital video recording / reproducing apparatus according to claim 3, wherein said video data unit is a frame unit. 8. The digital video recording and reproducing apparatus according to claim 7, wherein said predetermined number F is set to correspond to a predetermined recording time. 9. The digital video recording and reproducing apparatus according to claim 7, wherein said predetermined number F is set to correspond to a predetermined data amount.