JPH10243346A - Recording / playback storage device and data recording / storage method - Google Patents

Abstract

(57) [Problem] To provide an apparatus for recording and reproducing video data of a plurality of channels so that required video data can be stored while increasing a seek speed. SOLUTION: A recording area of a first data storage device is arranged in a logical address direction, for example, into four blocks 1, 2, 3,.
The video data (A, B, C, D) compressed sequentially on the time axis of four channels is recorded in a predetermined data group unit (four fields) in a time-division manner with respect to the data divided into four (square mark). Then, the recorded video data is reproduced in a time-division manner (○
Mark), the seek time of the recording / reproducing head is the shortest by performing addressing so that the recording head wraps only at both ends (inner circumference and outer circumference) of the block when writing and reading data. To be. Necessary data (for example, a mark “中 で”) in the recorded video data is read out to a buffer for storage at the time of reproduction and stored in the second storage device or divided in the first storage device. Recorded in the storage area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing storage device capable of recording / reproducing, for example, data of a plurality of channels corresponding to a disk-shaped recording medium to which random access is possible, and a data recording / storage device. .

[0002]

2. Description of the Related Art With the increase in capacity of disk-shaped recording media being promoted at present, for example,
In place of (Video Tape Recorder), time-series data such as video signal data (and accompanying audio signal data) is recorded on a disk-shaped recording medium such as a hard disk. A recording / reproducing apparatus capable of reproducing video / audio signal data recorded in a computer has been considered. In the case of a recording / reproducing apparatus capable of recording / reproducing video / audio or the like corresponding to such a disk-shaped recording medium, random access is possible,
In addition to the ability to quickly access and play back desired video information, it is also possible to perform various editing tasks and record video information on multiple channels on a large-capacity recording medium so that the video signal can be viewed later. Become.

In order to make the recording / reproducing apparatus more useful as described above, for example, video signal data for a plurality of channels for one day can be simultaneously recorded by, for example, time division. It is preferable that a recording format is adopted so that video data of a desired channel can be quickly searched and extracted at the time of subsequent reproduction. Further, while recording a plurality of video signal data and the like on one disk-shaped recording medium, at the same time, reproducing and displaying desired video signal data already recorded on the disk-shaped recording medium, Providing a function that can be stored further increases the usefulness.

In the case where real-time properties are required, such as when simultaneously recording and reproducing time-series data such as video signals and audio signals, a predetermined recording area is read when data is read into or read from a recording medium. An increase in seek time for access becomes a problem, and this seek time increases the data transfer time. Accordingly, the present applicant has previously proposed a video signal recording / reproducing apparatus which performs addressing so that a large amount of video data can be read simultaneously with a short seek time. For example, when recording video data on a disc or the like, the video signal recording / reproducing apparatus divides and arranges a plurality of recording blocks in a radial direction of the disc, and sequentially applies a plurality of video signals to the plurality of recording blocks in a predetermined manner. , Recorded and reproduced.

[0005]

The above-mentioned recording / reproducing apparatus comprises:
When a large amount of video data is recorded and reproduced on a recording medium, the seek speed can be increased. However, since the recording medium has a limited capacity, all the areas are cleared when the recording area of the disk is exhausted. Alternatively, a method is considered in which necessary video data that is not desired to be overwritten is protected so that only that area is not updated.
However, if such a method is adopted, the address management of the disk becomes complicated, and if the protection is repeated many times, the update area becomes fragmented, and the complexity further increases. Also, since the area to be preserved (the area to be protected) does not exist equally for each area of the divided disk as described later, the division boundary is calculated every time to divide the area equally. There is a need to do it again.

[0006]

According to a first aspect of the present invention, a recording area of a disk-shaped recording medium is divided in a logical address direction to divide a plurality of recording blocks. Block setting to be set, formation of a data group unit forming a data group unit by sequentially arranging the data of the plurality of channels in a predetermined field unit, and recording and reproduction in the data group unit are sequentially performed on the block. At the time of execution, a system controller capable of addressing the recording block other than the outermost block or the innermost block so that the physical movement direction of the head is not reversed is provided, and the desired data reproduced by the system controller is provided. Saving the channel data of the second in the second data storage means And a recording reproducing storage apparatus characterized by providing a control function.

According to a second aspect of the present invention, a plurality of channel data are arranged by a predetermined number of fields to form a data group, and the data group is sequentially recorded in each block of data storage means divided in a logical address direction. When reproducing data in a recording block other than the outermost or innermost block, an address is specified so that the physical movement direction of the head is not reversed, and data of a desired channel is recorded / reproduced. The data recording and storage method is characterized in that control is performed such that storage and recording are performed in the recording area.

[0008]

According to the present invention, as described above, data recorded on a disk-shaped recording medium in which blocks divided in the logical address direction are set in order to increase the seek speed can be read by another recording medium or its own at the time of reading. A function to save data in the storage area of the recording medium at the same time eliminates the need to protect the specific area and save it, and does not complicate the initial addressing state even when recording is restarted next time. . Further, the data of the plurality of channels may be video signal data, for example, so that video data being broadcast can be recorded on a daily basis. By using the recording means, necessary video information can be reliably stored.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described first with reference to FIG. 1 which outlines a recording / reproducing apparatus which can be operated at a high seek speed previously proposed by the present applicant. The saving operation will be described. When a broadcast wave is received by the antenna 1, the received broadcast wave is branched and supplied to the recording circuit systems of the A channel to the D channel. For example, the recording circuit system of the A channel includes a tuner (A) 2, a video signal processing circuit 3, an A / D converter 4, a video signal compressor 5, and a memory 6. The tuner (A) 2 includes an antenna 1 To select a broadcast wave of the channel A received by and output a video signal of the selected channel. The video signal processing circuit 3 converts the video signal supplied from the tuner (A) 2 into an AGC (Aut) signal.
Omatic Gain Control) and other necessary video signal processing and output to the A / D converter 4. A / D
The video signal converted from an analog signal to a digital signal by the converter 4 is supplied to a video signal compressor 5. The video signal compressor 5 performs a compression process on the video signal by a predetermined compression method. Here, the compression method of the video signal data is not particularly limited. For example, in the case of video signal data, MPEG (Moving Picture Ex
perts Group), MPEG2, JPEG (Joint Photograp
hic Coding Experts Group). The data compressed by the video signal compressor 5 is supplied to a memory 6 where it is temporarily stored.

Similarly, the tuner (A) 7, the tuner (B) 12, and the recording circuit system of the B to D channels selected by the tuner (D) (video signal processing circuits 8, 13,
18, the A / D converters 9, 14, and 19, the video signal compressors 10, 15, and 20, and the memories 11, 16, and 21) are the same as the above-described A-channel recording circuit system. Omitted.

The video signal data stored in each of the memories 6, 11, 16 and 21 of the recording circuit system of the A channel to the D channel is read out at a required timing based on a recording format described later and transferred to the disk driver 25. Is done. The bus controller 24 performs write / read control on the memories 6, 11, 16, 21. The disk driver 25 is provided with a data storage device D composed of, for example, an optical disk or a hard disk capable of recording a large amount of data as a recording medium, and the data transferred to the disk driver 25 is stored in the data storage device D.
Will be recorded.

Next, the operation of the reproducing circuit system will be described. The data recorded in the data storage device D by the disk driver 25 is read out by performing control based on the bus controller 24. Among the data read from the storage device D by the disk driver 25, the data recorded as the A channel is transferred to the memory 26 and stored. Similarly,
Data of the B to D channels are stored in the memories 28 and 3 respectively.
0 and 32 are stored.

If the channel A is taken as an example, the data held in the memory 26 is a video signal expander 27.
Are subjected to a decompression process according to a predetermined method, and are supplied to the display memory 34. Similarly, B channels to D held in the memories 28, 30, and 32
The channel data is supplied to the video signal expander 2
9, 31, and 33, where the data is decompressed and supplied to the display memory 34. Memory 26, 2
The write / read control for 8, 30, 32 is performed by the controller 23 via the bus controller 24. The controller 23 performs write / read control on the display memory 34.

The video data output from the display memory 34 is converted into an analog video signal by a D / A converter 35 and supplied to a video signal processing circuit 36.
The video signal processing circuit 36 performs necessary signal processing such as emphasis on the input video signal, outputs a video signal (for example, a composite signal) to a monitor 37, and outputs an audio signal to a speaker 38. The monitor 37 performs image display based on the input video signal, and the speaker 38 performs audio output based on the input audio signal.

The operation unit 22 is provided with various key groups related to recording / reproduction, such as a channel switching key, a reproduction key, a variable speed reproduction key, a special reproduction key, a recording (recording) key, and the like. Have been. Key operation information performed on the operation unit 22 is transmitted to the controller 23. The controller 23 executes a required control operation according to the key operation information. Further, the controller 23 controls the bus controller 24 so that
Write / read control of the memories 6, 10, 15, and 20 of the reproduction circuit system and the memories 26, 28, 30, and 32 of the recording circuit system, and data recording / reading for the disk driver 25.
Execute playback control.

The basic rule of addressing is to divide a disk-shaped recording area into a plurality of blocks along a logical address as described below, and then sequentially move the head to an adjacent block. Recording is performed for each data group DG for each block. When the innermost or outermost block is reached, recording is performed by reversing the moving direction of the head so far and moving sequentially to adjacent blocks.

FIG. 2A shows a disk D constituting the data storage device 61, and FIG. 2B shows the disk D in FIG.
2 schematically shows an enlarged portion of the recording area surface of the disc D. As shown in FIG. 2B, the recording area of the disk D is divided into four blocks of blocks Br1, Br2, Br3, and Br4 from the outermost circumference to the innermost circumference along the logical address direction. In this embodiment, for example, the block Br1 is for the A channel, the block Br2 is for the B channel, and the block Br3
Is set as a recording area for the C channel, and the block Br4 is set as a recording area for the D channel.

FIG. 2C shows an example of the structure of the data group DG in the present embodiment. This FIG. 2 (c)
The data group DG of the disk D shown in FIG.
, The data group DG in the block Br1 to be recorded first. FIG. 2 (c)
Is formed such that the field image data A1, A2, A3, and A4 of the first to fourth fields of the A channel from the beginning are connected. The data group DG includes, for each channel,
A predetermined number of field images that are continuous on the reproduction time axis are formed by connecting a plurality of them. That is, the data group DG is formed so that the field image data group corresponding to the predetermined reproduction time length is continuous.

FIG. 3 shows a process of sequentially recording the data groups DG having the structure shown in FIG. 2C based on addresses specified in the track direction of the disk D as shown in FIG. 2B. This will be described with reference to FIG. FIG.
(A) shows the timing (V SYNC) of the vertical synchronization signal.
The passage of time is indicated by a field period. This figure 3
In (a), a number starting from 1 is assigned to each field period, and the first field period, the second field period,... FIG. 3B shows the data of the A channel in units of field images. FIG. 3C shows the timing at which the field image data of the A channel is compressed by the video signal compressor 5 and held in the memory 6. Is shown. FIG. 3D shows a recording timing for recording the compressed data of the field image unit held in the memory 6 on the disk D. Similarly, FIG.
(F) and (g) respectively show the B-channel field image data, the field image data compressed by the video signal compressor 10 and held in the memory 11, and the recording timing of the compressed field image data. 3 (h) (i) (j) are field image data of C channel, field image data compressed by the video signal compressor 15 and held in the memory 16, and recording timing of the compressed field image data, respectively. 3 (k), (l) and (m) show field image data of the D channel, field image data compressed by the video signal compressor 20 and held in the memory 21, and the compressed field image, respectively. This shows the data recording timing.

First, the fourth field period (FIG. 3A)
When the compressed video data corresponding to four fields is stored in the memory 6 shown in FIG. 1 for four fields, the bus controller 24 generates an address in the block Br1 of the disk D, for example. Then, first, the image data A1, A2, A3, A4 of the first to fourth fields of the A channel stored in the memory 6 are sequentially written. As a result, the data group DG composed of the field image data A1, A2, A3, and A4 of the A channel is first recorded in the block Br1 at the timing shown in FIG. 3D, for example.

In the subsequent sixth field period, the bus controller 24 generates an address in the block Br2 adjacent to the block Br1, and stores the image data B1 in the first to fourth fields of the B channel held in the memory 11. , B, B3, and B4 as the data group DG at the timing shown in FIG.

In the subsequent seventh field period,
For the address in the block Br3 adjacent to the inner side of the block Br2, the image data C1, C of the first to fourth fields of the C channel held in the memory 16 are stored.
2, C3 and C4 as a data group DG, FIG.
Writing is sequentially performed at the timing shown in (j).

In the subsequent eighth field period, the image data D1, D1 of the first to fourth fields of the D channel held in the memory 16 are stored in the memory 16 with respect to the address in the block Br4 adjacent to the inner side of the block Br3. D2, D3
D4 is sequentially written as a data group DG at the timing shown in FIG. By the process so far, FIG.
In the four field periods of the fifth to eighth field periods shown by (a), the recording of the first to fourth field image data of the A channel to the D channel is completed.

Then, in the ninth field and thereafter, first, for the address following the data group DG (D1, D2, D3, D4) recorded immediately before in the block Br4, the fifth to eighth fields of the D channel are used. The field image data is read from the memory 21 and is represented as a data group DG (D5, D6, D7, D8) in FIG.
Writing is sequentially performed at the timing shown in (m).

After the write operation is completed, the address of the block Br3 (the address following the data group DG (C1, C2, C3, C4)) adjacent to the outer periphery of the block Br4 is added to the field image of the C channel. Data C5 to C8 are sequentially read from the memory and written as data group DG. Thereafter, in the same manner, similarly, addresses are sequentially generated for the block Br2 → block Br1 adjacent on the inner peripheral side, and the B-channel field image data B5, B6, B7, and B8 and the A-channel field image data A5, respectively. , A6, A7, and A8 are written as a data group DG.

Subsequently, in the same block Br1,
For the address following the data group DG (A5, A6, A7, A8), the field image data A9, A10, A11, A12 of the A channel are sequentially read from the memory 6 and written as the data group DG. Thereafter, recording of the data group DG is performed in accordance with the signal processing and addressing described above.

As a result of recording by the above-described data flow, recording is performed in units of data groups DG on the disk D according to the addressing pattern in the order shown by the arrow in FIG. Will be. As can be seen from FIG. 2B, in the present embodiment, the field image data of the A channel is used in the block Br1, the field image data of the B channel is used in the block Br2, and the field image data of the C channel is used in the block Br3. The image data is managed so that the field image data of the D channel is logically continuously recorded in the block Br4.

Next, the operation of reproducing data recorded according to FIGS. 2 and 3 will be described with reference to FIG.
FIG. 4A shows the timing of the field period by the vertical synchronizing signal as in FIG. 3A. FIG.
(B) and (c) respectively show the read timing of the field image data of the A channel with respect to the disk D, and the read data to the video decompressor 26 via the memory 26.
Shows the output timing after decompression. FIG.
4D and 4E show the read timing of the field image data of the B channel and the output timing of the read data after decompression, respectively. FIGS.
4 (h) and 4 (i) show the read timing of the field image data of the D channel and the expansion timing of the read data. This shows the output timing later.

In this case, the reading of the data recorded on the disk D is performed by the same addressing as that at the time of recording shown in FIG. Bus controller 2
4 is a data group DG in the block Br1.
By generating the recorded address of (A1, A2, A3, A4), the field image data A1, A2, A from the disk D is generated as shown in FIG.
3 and A4 are read. In this case, the reading order in the data group DG is the field image data A1.
→ A2 → A3 → A4 data sequence. The data read in this way is transferred to the memory of the reproduction circuit system of the channel corresponding to the read data. That is, the field image data A1, A2, A3, and A4 are stored in the memory 26.

Thereafter, the bus controller 24 similarly operates the data group DG (B1, B
2, B3, B4) → Data group D of block Br3
G (C1, C2, C3, C4) → Read data group DG (D1, D2, D3, D4) of block Br4 and transfer it to the memory of the reproduction circuit system of the channel corresponding to the read data.

According to FIG. 4, the operation of reproducing the data of the blocks Br1 to Br4 and transferring the data to the memory described above is completed within a time (4/60 seconds) corresponding to a four-field period. It has been like that.

As described above, the four field periods from the first field period to the fourth field period (FIG. 12)
The field image data of each channel stored in the memories 26, 28, 30, and 32 over (a)) is obtained in the following four field periods after the fifth field period.
The video signal decompressors 27, 29,
31 and 33. As a result, the fifth
During the field period, field image data at the same time between channels can be output at the same timing.

In this figure, FIGS. 4 (c) (e) (g)
As shown in (i), first, in the fifth field period, the expanded field image data A1, B1, C
1, D1 are output, and the field image data images A2, B2, C decompressed in the subsequent sixth field period
2, D2 will be output. Thereafter, the field image data A3, B3, C3, D
3, field image data A4, B4, C4, D4,.
Are expanded and output in this order. The decompressed data is adjusted by the controller 23 so that the data is read / written from / to the display memory 34 at a required timing so as to conform to a display mode designated by, for example, operation of the operation unit 22 by the user. Execute control.

After the data group (D1, D2, D3, D4) in the block Br4 described above is reproduced,
In the same block Br4, the data group (D5,
D6, D7, D8) are read out and transferred to the memory 32. Hereafter, block Br3 → block Br2 →
In accordance with the basic addressing rules of this embodiment, block Br1, block Br1, block Br2, and block Br3, the field image data is sequentially read in units of data groups DG, and the read field image data is transferred to the channel. Is transferred to the memory corresponding to. Thus, the normal reproduction operation according to the present embodiment is performed.

Next, a description will be given of a simultaneous recording / reproducing operation for recording data of a plurality of channels and reproducing already recorded data at a normal speed in this embodiment with reference to FIG. Here, a case where data reproduction is performed from the first field and recording is performed from the 53rd field is shown. Also in this figure, a data group DG to be written from now on is indicated by a concatenation of □ marks (indicating one-field image data), and a data group DG that has been recorded and is to be reproduced from this is indicated by ○.
This is indicated by the concatenation of marks (indicating one-field image data).

This simultaneous recording / reproduction operation may be performed according to the same addressing rule as recording or reproduction. FIG. 5 shows an addressing pattern in which data groups DG are connected by solid lines.

In this embodiment, since the structure of the data group DG is such that field image data continuous on the time axis are linked, for example, as the first operation, first, the data group ( A1,
A2, A3, A4) are issued, and the data group DG (A1, A2, A3, A4) is read and transferred to the memory 26. Subsequently, an address is issued in the same block Br1, and A
Channel field image data A53, A54, A
Data of four fields 55 and A56 are written to the disk D as a data group DG. Thereafter, similarly, reading / writing of the required data group DG is sequentially performed for each block, and the read field image data is transferred to the corresponding memory of the reproducing circuit system.

At the time of simultaneous recording / reproduction shown in FIG. 5, the reproduction / recording processing for four blocks of blocks Br1 to Br is completed within the time of four fields (4/60 seconds). Memory 2 during these 4 fields
The video data stored in 6, 28, 30, 32 is transmitted to video signal decompressors 27, 29, 31, 33 one field at a time within the next four field periods.

In the case of this embodiment, channels A to
The field image data of the D channel at the same time is read from the disk D and stored in the memories 26, 28, 30, and 32.
As shown in FIG. 5, it is necessary to complete addressing for four blocks along the inner circumferential direction or the outer circumferential direction in order to store all of the addresses in the first row. That is, four field periods are required. As described above, the time required for the recording / reproducing apparatus of this embodiment to perform signal processing from the video signal expander to the video signal processing circuit is equivalent to two fields (2 fields).
/ 60 seconds), the signal of the first field of each channel is reproduced 6 fields after being further delayed by 4 fields. For example, as shown as a “monitor output field” in FIG. 5, reproduction of the data group DG (C5, C6, C7, C8) and data group DG (C57, C58, C59,
When the recording of C60) is being performed, the image and sound of the first field of each channel are being output from the monitor 37 and the speaker 38, and thereafter, the second field is output every field period. Are reproduced in the order of the field, the third field, the fourth field, and so on.

By the way, as described above, the block Br
After the head reaches the innermost block Br4 from the first side, if the subsequent data read / write processing is executed in the order of, for example, read → write in the same manner as the previous processing, in the block Br4 of FIG. The head is moved such that the moving direction of the head is reversed twice. This is disadvantageous from the viewpoint of shortening the seek time.

However, when the head reaches the innermost circumference or the outermost circumference and performs the recording / reproducing while reversing the moving direction, the order of the data writing process to the disk D and the data reading process should be reversed. Thus, the seek time can be reduced. For example, after the reading of the data group DG of the fourth field and the writing of the data group DG of the 56th field in the block Br4 are completed as described above, first, the data in the 57th field is added to the subsequent address. Group D
G is written, and then the data group DG of the fifth field is read. Accordingly, the movement of the head in the block Br4 is, as shown by the solid line,
The operation of reversing the moving direction only needs to be performed once.

Subsequently, block Br3 → block Br
For each block Br1, data write processing and data read processing are executed in the order of writing the data group DG of the 56th to 58th fields and reading the data group DG of the 6th to 8th fields. When the above operation is completed and the moving direction of the head is reversed in the outermost block Br1, the order of writing / reading of the data group DG is changed in accordance with the addressing rule for simultaneous recording / reproduction described above. Reverse to That is, after the reading of the data group DG of the eighth field, the data group DG of the ninth field recorded at the subsequent address is read, and the writing process of the data group DG of the 58th field is executed. Is done.

Thereafter, reading / writing of the data group DG is alternately executed for each block in a predetermined order according to the addressing rule in accordance with the addressing rule described above. Therefore, although the seek time of the head is simultaneous recording and reproduction, the moving distance of the head is considerably shortened as compared with the normal method of recording along a track sequentially without dividing into blocks. When recording and reproducing a large amount of video data and the like, very effective recording and reproduction can be achieved.

According to the present invention, while using the above-mentioned addressing, an operation for saving necessary information is performed instead of protecting the necessary information in another area. In this figure, reference numeral 51 (A, B, C, D) denotes a video signal source corresponding to the tuner and the video signal processing section shown in FIG. It corresponds to a channel signal source such as a television device having a signal output, a VTR, and a cable television broadcast signal. 5
2 (A, B, C, D) An A / D converter for converting an analog signal into a digital signal, 53 (A, B, C, D) converts an image signal into a digital signal in order to reduce the amount of accumulated data. It is a video signal and audio signal compressor which is compressed by the JPEG, MPEG system or the like on the basis of the vertical synchronization signal, and its data is stored in, for example, a memory means 54 (A, B, C, D) having a recording buffer and a multiplexing function. And the compressed bit stream data is read out from the memory means 54 (A, B, C, D) based on the timing of the recording address output from the system controller 61, and is stored in the main storage device 60 ( (First hard disk).

Similarly, for a sound signal, a stereo sound signal (L / R) is converted into a digital signal and then converted to an MPEG signal.
A compressed bit stream subjected to a compression process such as AUDIO is recorded in the memory of the compressor. Then, the data is stored in the storage device 60 based on the address signal output from the controller. The memory means 54 (A, B, C,
In D), each bit stream of A / V is input to a recording buffer and stored as it is. Thereafter, as described above, each of the channel data A to D is time-divisionally transferred at high speed by the high-speed addressing method under the control of the system controller 61. At this time, the video and audio bit streams are converted into one stream data. And user data is inserted at the same time.

That is, in this embodiment, the simultaneous recording and reading mode can be set by the operation unit 62. At this time, the write address and the read address specified by the high-speed addressing method described above are transmitted from the controller 60. The data output to the bus line and read out is temporarily recorded in a memory means 55 constituting a buffer 55 for separation and reproduction. The input bit stream of the reproduction data is separated into video and audio data and user data, sequentially stored in a reproduction buffer, read out in accordance with the timing of the next expansion circuit 56, and then expanded. In, the video signal is expanded to a YUV digital signal, and the
Sent to

In the display block 57, a GUI index screen at the time of saving is created, and a freeze processing of the screen at the time of variable speed reproduction is performed. At the time of normal reproduction, only a superimposed display processing of characters and the like is performed. Finally, the signal is returned to an analog signal by the D / A converter 58, subjected to NTSC chroma encoder, addition of synchronization information, analog output signal processing, and the like, and output from the S video terminal as a video signal. On the other hand, the audio bit stream is expanded into a stereo audio signal (L / R) by an expansion block of the audio signal, and is also a D / A converter 58 for audio.
Is output as a stereo signal. If the storage device 60 is high-speed and has an enormous recording area, it is possible to omit the signal compression processing and decompression processing at the time of recording and reproduction, and to adopt a circuit configuration that performs recording and reproduction in real time. Becomes

In the present embodiment, a storage buffer 63 for storing channel data required in the recorded video data, and a storage device 6 for storage.
4 are arranged. The storage (second storage device) 64 for storage uses, for example, a magneto-optical disk or a tape as a recording medium, and is preferably a recording medium sufficiently durable for permanent storage.

Next, an example of recording and reproducing video data and storing a desired channel in the above-described apparatus will be described with reference to FIG. This figure shows that the disk is divided into four
FIG. 4 is a schematic diagram showing a case where recording / reproducing and storing operations are performed on video data A to D of a channel by the above-described addressing method, and the flow of time is from the top to the bottom. That is, the writing and calling of data for simultaneous 4-channel recording, 1-channel reproduction, and 1-channel storage data are indicated by □ in the recording field and ○ in the reproduction field.
, And the storage field is indicated by a triangle. Reproduction is performed from the first field (○) of the B channel recorded in block 2, and recording is performed on all input 53 fields (□).
Mark). Also, it is assumed that storage, which is a feature of the present embodiment, is performed from 17 fields (marked with △) in the block of the C channel.

The system controller 61 first issues a head address for recording a new field in the block 1 to the main storage device 60, and transmits video data from the 53rd frame of the A channel to the main storage device 60 from the recording buffer. Field 5 for storage device 60
3 to 56 fields are transmitted as a multiplexed bit stream. Next, a transition is made so as to access block 2. At this time, a reproduction request has occurred in the channel B area of block 2, and the current address of the channel B to be recorded in block 2 is smaller than the new recording address. Are close, the system controller 61
Is controlled to issue an address from the first field of the B channel to be reproduced existing in the block 2. Then, the video data of channel B is transferred from the main storage device 60 to the buffer for reproduction by four fields at a high speed. And then block 2
, A multiplexed bit stream is transferred from 53 fields to 56 fields and recorded.

Next, the system controller 61 controls the main storage device 60 to access the block 3. Since a storage request has been issued for the C channel data in the block 3, if the new recording address for recording the channel C is closer to the current address, the system controller 61 determines the channel C to be stored, for example, An address for reading the video data of the twentieth field from the seventeenth field is issued, the multiplexed data of channel C is read from the main storage device 60, and transferred to the buffer 63 for storage. Thereafter, a new address is issued, and fields 53 to 56 of channel C are recorded. If the new address of the signal to be recorded when the head moves to the block 3 is closer to the address where the data to be stored is recorded, the address is issued so that the above-described recording and storage operations are reversed. You may.

Next, the system controller 61 issues a new recording address in block 4 to the main storage device 60, and transfers the new recording address from the recording buffer of channel D to
Transfer a multiplexed bit stream from 3 fields to 56 fields. The recording of four blocks, the reproduction of one block, and the storage processing of one block so far have been performed within the time of 4 fields (4/60 seconds in the case of NTSC) which is the same as the number of fields accessed at one time. Let it complete. Thereby, real-time simultaneous recording / reproduction + storage can be realized. In the case of intermittently inputting a video signal by performing frame dropping or the like at the time of recording, it is sufficient to complete the video signal within the same field time as the number of fields to be input at one time × intermittent interval.

When the recording / reproducing and storing operations up to block 4 have been completed in this way, the movement of the head is now reversed. That is, the main storage device 60 is accessed from the block 4 to the block 3, the block 2, and the block 1. In the block 3, the storage operation is performed.
In block 2, the reproducing operation and the recording operation are performed in a time-division manner, and the process moves to block 1. Then, in this block 1, continuous fields 57 to 60 of channel A are recorded, and furthermore, 61 to 64 are recorded.
Thereafter, the movement to the block 4 side is started again by the high-speed addressing method. Therefore, according to the recording / reproducing and storing method of the present invention, the movement of the head is simplified by the high-speed addressing method, and the seek speed can be increased even though various operation modes are executed in a time-division manner.

The number of fields to be accessed and stored once in the second storage device for storage is set within a range in which real time can be maintained by the transfer rate of the main storage device 60. Therefore, when the number of channel signals to be simultaneously recorded and reproduced is small, the time corresponding to the time can be used for the reading time for storage, and the data can be stored at a higher speed. For example, in FIG. 8, channel data A, B, and
When C and D do not exist, a recording time of 16 fields can be allocated to the storing operation of the channel C. Therefore, as shown in FIG. Can be set as the time for storage, and the narrower seek range of the head contributes, thereby enabling a higher-speed storage operation.

In the above embodiment, the accumulation of data for storage is recorded in the second storage device 64. However, the storage device for storage is a part of the main storage device 60 having a large capacity. An area can be reserved as a storage area. In this case, the capacity of the main storage device 60 that can be freely recorded is reduced, and the operation of recording for preservation is increased, so that a higher-speed operation can be performed as compared with the case where the second storage device is used. Required. However, conversely, the high-speed main storage device 6
Since the storage is performed at 0, there is also an advantage that high-speed random access becomes possible during reproduction of the storage area.

FIG. 9 shows addressing when a storage area is provided in the main storage device 60. Block 4 is set as a storage area. In this example, reproduction is performed from the first field of channel B recorded in block 2 and recording is performed from 53 fields of each channel, and the number of fields accessed at one time is four. The storage is performed by transferring the reproduction data from the 17th field of the channel C from the storage buffer (63) to the storage area of the block 4.

In this example, first, the system controller 6
1 issues a head address for recording a new field in the block 1 to the main storage device 60, and multiplexes from the recording buffer of the channel A to the main storage device 60 from 53 fields to 56 fields. Transfer the bit stream. Next, the access is moved to the block 2.
Since a reproduction request has been issued to the area within the area, first, if the current address is closer to the current address than the new recording address, the system controller 61 transfers the multiplexed bit stream of channel B to a buffer for reproduction of 4 fields. Transfer at high speed. Thereafter, a new address in the block 2 is issued, and the multiplexed bit stream from 53 fields to 56 fields is transferred and recorded at a high speed in the channel B video data.

Next, the system controller 61 shifts to access the main storage device 60 in block 3. At this time, since a storage request has been issued for the video data of block 3, if the current address is closer to the current address than the new address, the system controller 61 sets, for example, the 17th of the area where the data to be stored is recorded.
The address of the field is issued, and the multiplexed bit stream of the channel C is transferred to a buffer for storage for several fields. Thereafter, a new recording address is issued in the block 3, and the multiplexed bit stream from 53 fields to 56 fields from the recording buffer of channel C to the main storage device 60 is transferred and recorded at high speed. If the new recording address is closer to the previous address than the address to be stored, the recording and storing operations are reversed.

Next, the system controller 61 shifts access to the block 4 (storage area) for the main storage device 60. At this time, if a storage request has been issued and if the storage buffer 63 has been stored, a new storage address is issued, and the number of storages stored in the main storage device 60 from the storage buffer is issued. Transfer the multiplexed bit stream for the field. The recording of three blocks, the reproduction of one block, and the storage of two blocks so far have been performed within a time of 4 fields (4/60), which is the same as the number of channels accessed at one time.
Seconds). As a result, real-time simultaneous recording / reproduction + storage is realized. When the video signal is input intermittently, the video signal may be completed within the same time as the number of fields to be accessed at one time × intermittent time.

After this, that is, after recording / reproducing and storing the data up to block 4, the seek direction of the head is reversed, and the main storage device 60 is moved from block 4 to block 3, block 2 and block 1 in this order. In block 3, a recording / storing operation is performed in a time-division manner, and in block 2, a recording / reproducing operation is performed in a time-division manner.
In block 1, the recording operation up to now is repeated. Therefore, in this operation example, storage is performed by reciprocating the head 2
The batch data is stored in a storage buffer, and is transferred to the main storage device 60 when the storage area is accessed. The number of fields to be stored at one time is set within a range in which real time is maintained by the transfer rate of the main storage device 60. Further, if the number of channel inputs for recording / reproduction is reduced, the time corresponding to the input can be used for the time for storage and reading, and the speed can be further increased.

In this embodiment, the case where video information is recorded and reproduced at a normal speed has been described.
A normal (1 × speed) reproduction is performed in parallel with the recording of the video data of a plurality of channels as described above, and a double speed reproduction of m (m = 1 to 5) is performed in parallel with the data recording. It is also possible to set a mode in which recording is performed with dropped frames during recording. If a high-speed addressing method is used even during the above-mentioned variable speed recording or reproduction, the moving distance of the head can be reduced as compared with the conventional one, and as a result, recording / reproducing and storing operations with a high seek speed can be performed. There is an advantage that it becomes possible.

In the above embodiment, a group of video data recorded by one access to each divided block of the recording medium is a continuous field signal in each channel. A1, A
2, A3, A4) are connected so as to form a combination (A1, B1, C, 1, D1,) of video data for each channel, and (A2,
(B2, C2, D2), data of one field of video data of each channel may be sequentially supplied from a buffer and recorded. In this case, signal processing such as reproducing output or supplying to the second storage device while separating only the data of the channel to be reproduced and the data of the channel to be stored from the data group reproduced from each block at the time of reproduction. Is performed.

[0063]

As described above, the recording / reproducing apparatus of the present invention, when recording and reproducing a plurality of channels of video signals and the like on a large-capacity recording medium, creates a recording area in the direction of the logical address of the recording medium. Since a predetermined data group is sequentially recorded and reproduced in the divided blocks, the seek range of the head can be narrowed even when performing simultaneous recording and reproduction, and desired data can be read at high speed. it can.

Further, according to the present invention, it is possible to store necessary data from a large amount of recorded video data by a high-speed addressing method, and it is not necessary to protect and protect a necessary data area at that time. There is an effect that the storage area and the storage in the second data storage device can be performed by simple address management. As the second data storage device, a low-speed and inexpensive removable recording media (tape, magnetic disk) can be used depending on the application, so that a sufficient storage device can be constructed without worrying about the recording capacity. There is an effect that can be.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an apparatus for recording video data of a plurality of channels.

FIG. 2 is an explanatory diagram of a recording medium on which data of a plurality of channels is recorded.

FIG. 3 is a timing waveform chart when data of each channel is recorded.

FIG. 4 is a timing waveform chart at the time of reproducing each recorded channel data.

FIG. 5 is an explanatory diagram showing a temporal flow and addressing when simultaneously recording and reproducing data of a plurality of channels.

FIG. 6 is a schematic diagram of a recording / reproducing / storing device capable of saving a part of recorded channel data.

FIG. 7 is a diagram for explaining a temporal flow in a simultaneous recording / reproduction and storage mode and an example of addressing thereof.

FIG. 8 is an explanatory diagram showing a storage operation when there is no recording channel.

FIG. 9 is an explanatory diagram of addressing when a storage area is formed in a primary storage.

[Explanation of symbols]

51 (A, B, C, D), 52 (A, B, C,
D), 53 (A, B, C, D), 54 (A, B,
C, D), 60 main storage device, 61 system controller, 62 operation unit, 63 storage buffer, 64 storage storage device

Claims (9)

[Claims] 1. A data recording / reproducing / storing device for recording data of a plurality of channels in a data storage means, wherein a recording area of a recording medium forming the data storage means is divided in a logical address direction to divide a plurality of recording blocks. Block setting means for setting, data group unit forming means for sequentially arranging the data of the plurality of channels in units of a predetermined number of fields to form a data group unit, and sequentially recording the data of the data group unit in the block And a system controller having an address setting means capable of designating an address in a recording block other than the outermost block or the innermost block so that the physical movement direction of the head is not reversed. Reproduced from the data storage means by the controller A recording / reproduction / storage device comprising a storage control means for storing desired channel data in a second data storage means. 2. The recording / reproducing storage device according to claim 1, wherein said second storage means is assigned a specific area of said data storage means. 3. The recording / reproducing / storing device according to claim 2, wherein the data of the plurality of channels are each compressed video data. 4. The recording apparatus according to claim 1, wherein said data group unit forming means is configured to form a data group unit in which video data of each channel is arranged in units of several fields. Playback storage device. 5. A data group is formed by arranging a plurality of channel data by a predetermined number of fields, and when the data group is sequentially recorded and reproduced in each block of the data storage means divided in the logical address direction, In a recording block other than the outermost or innermost block, address designation is performed so that the physical movement direction of the head is not reversed, and simultaneous recording of data of a desired channel,
A data recording and storage method, wherein control is performed such that reproduction and / or storage and recording in a second recording area are performed. 6. A data recording and storing method according to claim 5, wherein said second storage means is assigned a specific area of said storage means. 7. The data recording and saving method according to claim 5, wherein the data of the plurality of channels is each compressed video data. 8. The data recording and storing method according to claim 5, wherein the data group unit is configured by connecting data of each channel by a predetermined number of fields. 9. The data group unit forming means is configured to form a data group unit by connecting video signal data of each channel by the number of channels in a field unit. 5. The data record storage method according to 5.