JPH11220693A - Moving image recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a moving image recording device for properly recording a moving image, and reproducing a recorded moving image by a desired reproducing device. SOLUTION: When a recording button 26a is pressed, moving image data and voice data inputted and compressed in a real time are positionally continuously recorded in the sequential data recording area of a hard disk 20. When a copy button 26c is pressed after the end of recording, the compressed data are read from the sequential data storage device, and recorded in an FAT(file allocation table) data recording area formed in the hard disk 28. An FAT system is used for the recording of the compressed data. The moving image data in a real time are continuously recorded in the sequential data recording area so that the moving image can be properly recorded. Also, the recorded moving image data are recorded in an FAT data recording area in the FAT system so that the image picture can be reproduced by a personal computer which adopts the same system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving image recording apparatus, and more particularly to a moving image recording apparatus for recording moving image data on a recording medium such as a hard disk.

[0002]

2. Description of the Related Art As a method of recording data on a recording medium such as a hard disk, an FAT (File Allocation Table) system in the MS-DOS format is well known. In the FAT method, data is recorded discretely in cluster units, so that data can be efficiently recorded on a recording medium. Further, since the related clusters are connected to each other by the chain, the data can be appropriately reproduced.

[0003]

However, such F
The AT method is not suitable for recording moving image data because the access speed is limited. On the other hand, if moving image data is recorded by a method different from the FAT method, the FA
A personal computer employing the T method cannot reproduce the moving image data.

[0004] Therefore, a main object of the present invention is to provide a moving picture recording apparatus capable of appropriately recording a moving picture and reproducing the recorded moving picture by a desired reproducing apparatus.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a moving picture recording apparatus for recording moving picture data on a recording medium having at least a first data recording area and a second data recording area. Data first
First recording means for sequentially recording the data in the data recording area, and second recording means for recording the moving image data recorded in the first data recording area in the second data recording area in a desired manner A moving image recording apparatus comprising:

[0006]

When the recording button is pressed, the moving image data input in real time is continuously recorded in a sequential data recording area formed on the hard disk in a positional manner. That is, the moving image data is first written to the buffer memory at the reference clock rate, and then read from the buffer memory at the high clock rate. Then, the data is recorded in the sequential data recording area by the hard disk drive. When the amount of data in the buffer memory exceeds a predetermined value, reading is started.

When the copy button is pressed after the recording is completed, the moving image data is read from the sequential data recording area and recorded in the FAT data recording area formed on the same hard disk by the FAT method. At this time, the moving image data is recorded in the FAT data recording area via the buffer memory.

[0008]

According to the present invention, since real-time moving image data is continuously recorded in the first data recording area, moving images can be appropriately recorded. Also, since the recorded moving image data is recorded in the second data recording area in a desired format, it can be reproduced by a reproducing device employing the same format.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0010]

Referring to FIG. 1, a moving picture recording / reproducing apparatus 10 of this embodiment includes input terminals S1 and S2 for inputting moving picture data and audio data, respectively. The input moving image data and audio data are stored in the MPEG codec 1
2 and the compressed moving image data and audio data (hereinafter collectively referred to as compressed moving image data).
Is output from the MPEG codec 12. The compressed moving image data is supplied to the memory control circuit 16 at a reference clock rate and a DMA (Direct Memory Access).
Is written to the buffer memory 14. That is, the memory control circuit 16 outputs a request to release the bus 13 to the system controller 22, and the system controller 22
Allows the bus 13 to be released, the compressed moving image data is written to the buffer memory 14. The buffer memory 14 is constituted by a FIFO dual port memory, and can simultaneously write and read data.

The system controller 22 constantly monitors the amount of data in the buffer memory 14, and when the amount of data exceeds a predetermined value, that is, a half of the memory capacity, the hard disk drive (HDD) 20 sends the data to the hard disk drive 28. Outputs a write request to. When the HDD 20 returns the write permission to the system controller 22, the system controller 22 reads out the compressed moving image data from the buffer memory 14 at a high-speed clock rate twice the reference clock rate. Therefore, the buffer memory 14 does not overflow. The read compressed moving image data is input to the HDD 20 via the interface 18, and is recorded on the hard disk 28 by the HDD 20.

The hard disk 28 has a sequential data recording area 30 and a FAT data recording area 32, as shown in FIG. Specifically, the sequential data recording area 30 is formed radially inside the hard disk 28, and the FAT data recording area 32 is formed radially outside the hard disk 28. Real-time compressed moving image data, that is, moving image data and audio data input from the input terminals S1 and S2 and subjected to MPEG compression are recorded in the sequential data recording area 30 continuously in position. That is, the head (not shown) provided in the HDD 20 records the compressed moving image data along the track of the hard disk 28 without straddling the track at the time of recording. It should be noted that such recording processing on the sequential data recording area 30 is started in response to the operation of the recording button 26a provided on the remote control transmitter 26.

The compressed moving image data recorded in the sequential data recording area 30 is reproduced by the HDD 20 by a predetermined amount based on the operation of the reproduction button 26b.
The reproduced compressed moving image data is transmitted to the interface 18.
Is written to the buffer memory 14 via the. At this time, the HDD 20 reproduces the compressed moving image data at the high clock rate, and the system controller 20 also transmits the compressed moving image data at the high clock rate to the buffer memory 14.
Write to. The memory control circuit 16 reads the compressed moving image data from the buffer memory 14 at the reference clock rate in response to the bus permission signal from the system controller 20. When the amount of data in the buffer memory 14 falls below a predetermined value, the system controller 22 outputs a read request to the HDD 20. In response to the read request, the HDD 20 stores a predetermined amount of compressed moving image data on the hard disk 2.
Play from 8. In other words, the compressed moving image data is read out by a predetermined amount at a high clock rate and written into the buffer memory 14. Then, the compressed moving image data written in the buffer memory 14 is continuously read at the reference clock rate. Therefore, the buffer memory 14
Does not underflow.

The compressed moving image data read from the buffer memory 14 in this manner is stored in the MPEG codec 1
2 is extended. The expanded audio data is directly output to the television monitor 36, and the expanded moving image data is output to the television monitor 36 via the adder 34. The adder 34 is provided for adding character data to the expanded moving image data, and is specifically constituted by a digital switch.

The compressed moving image data recorded in the sequential data recording area 30 is reproduced in response to the operation of the copy button 26c. However, the reproduced compressed moving image data is recorded in the FAT data area 32 by the FAT method. Specifically, first, the HDD 20 reads out the compressed moving image data by a predetermined amount, and the system controller 22
Stores the read compressed moving image data in the buffer memory 1
4 temporarily. The compressed moving image data stored in the buffer memory 14 is then transmitted to the system controller 2.
2 and recorded in the FAT data area 32 by the HDD 20. At this time, the HDD 20
Recording is performed by the T method. For this reason, on the hard disk 28, compressed moving image data recorded continuously in position and compressed moving image data recorded in the FAT format are obtained.

When a verify (verify) button 26e is pressed, the compressed moving image data recorded on the hard disk 28 is reproduced for each error check unit (one sector). Done. If an error is detected, the next sector number is incremented. This processing will be described later. To divide the recording area of the hard disk 26, MS-DOS
The partition table used in is used. In the MS-DOS format, usually FDISK
Will create this partition table. The partition table at the highest level is called a master partition table. In this embodiment, as shown in FIG. 2, the master partition table 32c
Is recorded in the first sector of the hard disk 28.

FIG. 3A shows the contents of the master partition table 32c. The master partition table 32c includes a column indicating the contents of the basic partition and a column indicating the position (called an entry) where the partition table for the extended partition is recorded. In some cases, the master partition table is provided with a column for handling a description of a partition used by an OS other than MS-DOS.

When only one drive area is formed on the hard disk, only the primary partition exists. In a so-called DOS / V personal computer, the primary partition usually forms the C drive area. The extended partition is set when one hard disk is divided into a plurality of drive areas. The hard disk 28 of this embodiment is divided into two drive areas, and the sequential data recording area 30 becomes an extended partition. Then, as shown in FIG. 2, the extended partition table 30c is recorded at the head of the sequential data recording area 30.

FIG. 3 shows a case where one basic partition and one extended partition are set.
The boot indicator (BI) indicates whether data in the MS-DOS format has been booted in the drive area of interest.
0H, if not booted, 00H. In this embodiment, since the BI of the primary partition is 80H, the system file (data) of the MS-DOS is FA.
The data is recorded in the T data recording area 32. The system indicator (SI) is used to indicate whether the corresponding partition is a basic partition, an extended partition, an area used by another OS, and the like. S
H, SS, and SC indicate the start head number, start sector number, and start cylinder number of the corresponding partition, respectively, and EH, ES, and EC indicate the end head number, end sector number, and end cylinder number of the corresponding partition, respectively. Show. PSN indicates the number of sectors existing before the corresponding partition, and SN indicates the number of sectors occupied by the corresponding partition.

In FIG. 3A, the primary partition is
Head number 01H, sector number 01H, cylinder number 0
01H, head number 01H, sector number 01
H, ending with cylinder number F03H, 30H sector ahead of primary partition, primary partition 1
It has a capacity of E06H sector. The sector number is represented by the lower 6 bits of the sector number area, and the actual cylinder number is represented by the upper 2 bits of the sector number area.
It is represented by a total of 10 bits of 8 bits of a bit and a cylinder number area. The four bytes of the PSN area and the SN area are recorded in order from the lower byte. In this embodiment, 1
Assuming an HDD having 63 sectors and 64 logical heads, one sector has 512 bytes.

FIG. 3A shows that the head number of the entry of the extended partition is 001H and the sector number is 01.
H indicates that the cylinder number is 100H. That is, the extended partition table 30c, which is information on the extended partition, is written in this location. FIG. 3B shows the extended partition table 30c.
Indicates the contents of The format is master partition table 3
Same as 0b. According to FIG. 3B, only one drive area is allocated to the extended partition, and this partition ends with a head number 01H, a sector number 01H, a cylinder number 1F3H, and has a 30H sector before this partition. This partition has a capacity of 1E06H sector. If two drive areas are allocated, entry information of a table related to another drive area exists in the extended partition table 30c, and a table related to the drive area exists in an entry indicated by the entry information. I do.

When a partition is created according to the FDISK instruction, the C drive area is formatted by MS-DOS. On MS-DOS, F
When the instruction “ORMAT” is executed, the system reserved area, F
An AT area 1, a FAT area 2, a directory area and a data area are created. That is, the FAT data recording area 32 is created, and data can be managed by the FAT method. The FAT region 1 and the FAT region 2
, The same data is recorded for data security.

The FAT data recording area 32 is used for work that does not require much real-time properties such as editing work. That is, the data of the sequential data recording area 30 is
Data file is copied to the FAT data recording area 32,
The above operation is performed using the copied data file. Also, in the case of a removable medium such as a floppy disk, it is important that the recorded data can be taken to another computer and work on that computer. Even in such a case, it can be realized by moving the target file to the FAT data recording area 32.

In the sequential data recording area 30,
A data management area 30a and a data area 30b are formed as shown in FIG. 2, and the data management area 30a is configured as shown in FIG. That is, four sectors (2048 bytes) are allocated to the data management area 30a, and the first byte is a file number display area, and the number of files recorded in the data area 30b is stored in a 6-bit area of the 1 byte. Is recorded. The remaining two bits are reserved. The reserved area is an area reserved for the purpose of using when a future function is expanded, and its use is not specified at present.

Following the file number display area, information on a plurality of data files 1 to N containing compressed moving image data is written. For each file information, 40 bytes are allocated, and the first 32 bytes become a file name display area. Here, in addition to the file name described in ASCII code, the file type, attribute, and file creation date are described. Next, a 4-byte file start address area and a file end address area follow. Forty bytes from the file name display area to the file end address area are repeated by the number of files displayed in the file number display area. Since the data management area 30a is 2048 bytes, 2048/40 = a maximum of 51 files can be handled. A 2048-byte area (a cluster of four sectors is called a cluster) is
It is specified by one address. Since the file start address area and the file end address area have a 32-bit width, one cluster has 2 to the power of 3 * 2048 = about 8.
An 8 terabit recording area can be represented.

As described above, the data recording area 30b follows the data management area 30a, and the compressed moving image data is recorded in the data recording area 30b for each file. In the data area 30b, compressed moving image data is recorded in the order of clusters in which addresses increase by one. Therefore, a series of data is recorded in an adjacent cluster, and head access is minimized. When performing normal recording and reproduction that requires real-time properties, the sequential data recording area 30 is used.

In this embodiment, a replacement process for a sector having an error is also performed. As described above, it is assumed that an HDD is composed of 63 sectors in one cylinder.
The sector is set as a spare sector for the replacement process. Data is recorded by attaching a CRC error code to the 512-byte area, and if a CRC error is detected during reproduction, the sector is regarded as defective. Then, the next sector number is incremented by one. A defect of up to 3 sectors per cylinder is allowed.
Here, 16 bytes of C for 496 bytes of data
An RC code is added. A method of generating and checking a CRC code is well known. For example, a transistor technology SPECIAL
No. 27, page 21, shows a CRC code generation circuit. In this embodiment, this CRC code generation circuit is used.

By providing such an alternative error sector, error tolerance can be provided. In addition, since the replacement sector is in the same cylinder, the head access stroke does not increase. The system controller 22 specifically processes the flowcharts shown in FIGS. That is, when the recording button 26a is pressed, the system controller 22 first detects a free data area by referring to the data management area 30a in step S1 of FIG. Next, a write request is output to the HDD 20 in step S3, and when the HDD 20 returns a write permission, "YES" is determined in step S5. Then, in step S 7, a predetermined amount of compressed moving image data is read from the buffer memory 14 and output to the HDD 20. While the stop button 26d provided on the remote control transmitter 26 is not operated, "NO" is determined in the step S9, and it is determined whether or not the data amount of the buffer memory 14 exceeds a predetermined value (threshold) in a step S11. . If "YES", the process returns to step S3, and the above-described processing is repeated. On the other hand, if the stop button 26d is pressed, "YES" is determined in the step S9, the data management area 30a is updated in a step S13, and the process returns. Note that the compressed moving image data obtained after the recording button 26a is pressed until the stop button 26d is pressed is stored in one file.

When the play button 26b is pressed, the system controller 22 detects all file names by referring to the data management area 30a in step S21 in FIG. Then, the file name is displayed on the television monitor 36 in step S23. At this time, the system controller 2
2 outputs character data indicating a file name to the adder 34. Next, in step S25, it is determined whether any file name has been selected by the operator.
S ", the data management area 30a in step S27.
, A desired file is detected from the data area 30b. Thereafter, a read request is output to the HDD 20 in step S29. When the read permission is given from the HDD 20, "YES" is determined in the step S31, and the step S31 is performed.
At 33, the compressed moving image data read by the HDD 20 is written to the buffer memory 14. Thereafter, it is determined in step S35 whether or not the stop button 26d has been pressed, and if "NO", in step S37, it is determined whether or not the data amount of the buffer memory 14 has fallen below the threshold value. If "YES" here, the process returns to the step S29 to repeat the above-mentioned processing. When the stop button 26d is pressed, "YES" is determined in the step S35, and the process returns.

When the copy button 26c is pressed, the system controller 22 processes the flow charts shown in FIGS. 8 and 9;
, And the duplicated description is omitted. When the processing of step S53 is completed,
In step S55, the system controller 20
An empty cluster is detected with reference to the T area, and step S5
In step 7, a write request is output to the HDD 20. When the HDD 20 returns the write permission, the system controller 22 determines "YES" in step S59, reads out the compressed moving image data from the buffer memory 14 in step S61, and
Output to D20. Therefore, by the HDD 20,
This compressed moving image data is recorded in the FAT data recording area 30 by the FAT method. Thereafter, in step S63, it is determined whether or not the copying of the desired file has been completed.
If "O", the process returns to step S49 and repeats the above process. If "YES", the FAT area is updated in step S65 and the process returns.

When the confirmation button 26e is pressed, the system controller 22 proceeds to step S31 shown in FIG.
A read request for one error check unit is output to the HDD 20. On the other hand, when the read permission is returned from the HDD 20, the system controller 22 determines in step S73 that "Y"
ES ", and the compressed moving image data read by the HDD 20 is stored in the buffer memory 14 in step S75.
Write to. Then, in step S77, a sector error is checked by the sector error check circuit 24. If an error is detected here, "YES" is determined in the step S79, and the alternative sector process is executed in a step S81. On the other hand, if a sector error is not detected, the process proceeds to step S79.
Is determined as "NO", and the process directly proceeds to step S83.
In step S83, it is determined whether or not the processing has been completed for all the files recorded on the hard disk 28. If “NO”, the process returns to step S71, but “Y
If "ES", return.

According to this embodiment, since a real-time moving image is continuously recorded in the sequential data recording area, the moving image can be appropriately recorded. Further, the recorded moving image data is stored in the FAT data recording area in the FAT data recording area.
Since the recording is performed by the method, the moving image can be reproduced by, for example, a personal computer adopting the same method. In this embodiment, a hard disk in which two data recording areas are formed has been described. However, two or more data recording areas are formed in the hard disk, and a moving image is recorded in each data recording area by a different method. You may make it. Further, the recorded compressed moving image data is recorded in another data recording area by the FAT method, but the compressed moving image data may be recorded in, for example, a MacOS format. Although the compressed moving image data is recorded on the hard disk, an external recording medium such as a floppy disk may be used instead of the hard disk.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is an illustrative view showing a hard disk;

FIG. 3A is an illustrative view showing a master partition table, and FIG. 3B is an illustrative view showing an extended partition table;

FIG. 4 is an illustrative view showing a sequential data management area;

FIG. 5 is an illustrative view showing an operation of an error sector substitution process;

FIG. 6 is a flowchart showing a part of the operation of the embodiment in FIG. 1;

FIG. 7 is a flowchart showing another portion of the operation of the embodiment in FIG. 1;

FIG. 8 is a flowchart showing another part of the operation of the embodiment in FIG. 1;

FIG. 9 is a flowchart showing yet another portion of the operation of the embodiment in FIG. 1;

FIG. 10 is a flowchart showing another portion of the operation of the embodiment in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Moving image recording / reproducing apparatus 12 ... MPEG codec 14 ... Buffer memory 20 ... HDD 22 ... System controller 24 ... Sector error check circuit 28 ... Hard disk

Claims (7)

[Claims] 1. A moving image recording apparatus for recording moving image data on a recording medium having at least a first data recording area and a second data recording area, wherein the moving image data input in real time is stored in the first data recording area.
A first recording unit that records the moving image data recorded in the first data recording area in the second data recording area in a desired manner; 2 recording means,
Moving image recording device. 2. The moving picture recording apparatus according to claim 1, further comprising a buffer memory for temporarily storing said moving picture data. 3. The moving picture data input in real time is written into the buffer memory at a first clock rate, and the first recording means writes the moving picture data written into the buffer memory into the first clock rate. 3. The moving image recording apparatus according to claim 2, further comprising a reading unit that reads data at a second clock rate higher than the clock rate. 4. The moving picture recording apparatus according to claim 3, wherein said reading means starts reading when a data amount in said buffer memory exceeds a predetermined value. 5. The apparatus according to claim 1, wherein said second recording means records said moving image data recorded in said first data recording area in said second data recording area via said buffer memory. The moving image recording device according to any one of the above. 6. The moving picture recording apparatus according to claim 1, wherein said desired system is a FAT system. 7. The image processing apparatus according to claim 1, further comprising inspection means for inspecting an error of said moving image data recorded on said recording medium for each predetermined sector, and processing means for performing alternative sector processing according to an inspection result of said inspection means. Item 7. A moving image recording apparatus according to any one of Items 1 to 6.