JP2001320658A - Data recording and reproducing device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data recording and reproducing device that can enhance a processing speed and a processing efficiency in the case of transferring data in the unit of frames. SOLUTION: The data recording and reproducing device is provided with an I/O section 2 that inputs/outputs video information to/from an external device, an HDD 9 that records the received video information, a data buffer 7 that temporarily stores video information to be read from or recorded to the HDD 9, a distribution section 4 that classifies frame data received via the I/O section 2 at data recording into voice information, video information or system information and stores the information to the data buffer 7, an edit section 5 that reedits the voice information, video information or system information stored in the data buffer 7 at data reproduction through classification into a prescribed frame format and a disk medium control section 8 that transfers the voice information, video information or system information between the data buffer 7 and the HDD 9 in the unit of blocks at data recording or reproduction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording / reproducing apparatus provided with a recording medium, and more particularly to a method for recording frame data composed of audio information / video information and system information on a recording medium using a data buffer. The present invention relates to a reproducible data recording / reproducing device and a data recording / reproducing method.

[0002]

2. Description of the Related Art A conventional data recording / reproducing apparatus for recording data on a disk medium is disclosed in JP-A-7-22038.
As disclosed in Japanese Patent Application Laid-Open No. 9, the digitalized audio signal and video signal are divided into sector units, which are recording units of a disk medium, in a regular format and are recorded and reproduced.

[0003]

However, in an editing operation such as an audio editing and a video editing, an operation of exchanging only audio information and video information input from the outside while performing a reproducing operation is performed in a data buffer. After replacing the necessary parts, the entire frame data must be recorded, the processing time and processing efficiency deteriorate, and there is a possibility that the real-time property of the output audio / video cannot be guaranteed.

[0004] Even when only one of video information and audio information is required, such as when used as a time lapse device or an audio recorder device, it is necessary to record the entire frame data on a disk medium. The limited recording area of the medium is wasted.

[0005] Further, when an error occurs during recording / reproducing on a disk medium, even if the error is a part of video information, a part of audio information or a part of system information, all the frame data are generated. Must be processed as an error, and even for a small part of the error, an error countermeasure for the entire frame is required.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a data recording / reproducing apparatus which improves processing speed and processing efficiency when performing data transfer in a frame data format.

[0007]

In order to solve the above-mentioned problems, the data recording / reproducing apparatus of the present invention records and reproduces frame data not in units of frames but in units of information blocks. The data recording / reproducing apparatus of the present invention has the following configuration.

A first data recording / reproducing apparatus according to the present invention provides an I / O for inputting / outputting video information to / from an external device.
O means, a recording medium for recording video information input from an external device via the I / O means, and a data buffer for temporarily storing video information to be recorded on the recording medium or video information read from the recording medium And when recording data,
Frame data distribution means for classifying the frame data of the video information inputted via the I / O means into audio information, video information or system information and arranging them on a data buffer;
Frame data organizing means for reorganizing audio information, video information and system information classified and arranged on a data buffer into a predetermined frame format during data reproduction, and a data buffer and a recording medium during data recording or reproduction; Transfer control means for transferring audio information, video information, and system information in units of these blocks. As a result, the audio information, video information, and system information of the frame data can be accessed independently of each other. Therefore, when the recording and reproduction of the entire frame data is not required, the processing speed and processing efficiency can be improved, and the recording area can be improved. A data recording / reproducing apparatus capable of effectively utilizing the data and efficiently performing error processing can be realized.

[0009] Further, at the time of video editing, the transfer control means may replace the video information block recorded in the data buffer with the video information block portion of the frame data on the recording medium and record it on the recording medium. This can be realized by rewriting only the video information block and the system information block, so that the processing speed and processing efficiency can be improved.

[0010] Further, at the time of audio editing, the transfer control means may replace the audio information block recorded in the data buffer with the audio information block portion of the frame data on the recording medium, and record it on the recording medium. This allows
The processing speed and processing efficiency can be improved because it can be realized by rewriting only the audio information block, not all the frame data.

In recording data, the transfer control means may record only the video information block and the system information block on the data buffer on the recording medium. Further, at the time of data reproduction, the transfer control means may read out the video information block and the system information block recorded on the recording medium on the data buffer and create dummy audio information as an audio information block, The means may create frame data from the read video information block and system information block and the created dummy audio information. Thus, in the operation mode in which audio information is not required, by not recording audio information on a disk medium, a recording area can be effectively used, and more information can be recorded on a medium having a limited capacity.

Further, at the time of data recording, the transfer control means may record only the audio information block and the system information block on the data buffer on the recording medium. Further, at the time of data reproduction, the transfer control means may read the audio information block and the system information block recorded on the recording medium into a data buffer, and create dummy video information in a video information block portion. May create frame data from the read audio information block and system information block and the created video information block. Thus, in an operation mode in which video information is not required, by not recording video information on a disk medium, a recording area can be effectively used and more information can be recorded on a limited medium.

The data recording / reproducing apparatus may further include an error block determining means for determining a block in which an error has occurred when an error has occurred during reproduction from the recording medium. At this time, when it is determined that an error has occurred in the audio information block, the video information block, or the system information block, the data recording / reproducing apparatus is configured to prevent noise from occurring in a frame including each information block. May be further provided. This allows
If an error occurs during reading from the recording medium, it is possible to deal with the error in block units without treating all frame data as an error.

[0014] A third data recording / reproducing apparatus according to the present invention is a recording medium for recording frame data of a DV format composed of a plurality of blocks for each block, and temporarily stores data read from the recording medium. When reading frame data from a recording medium, the data is read out in the order of recorded blocks, classified according to the type of data, recorded on the data buffer, and transmitted from the data buffer to an external device. In the output of (1), data classified by type in the data buffer is reconstructed into a DV format and output. As a result, audio information, video information, and system information recorded on the recording medium can be reproduced in block units and output as DV format frame data.

In the data recording / reproducing method according to the present invention, frame data of video information composed of a plurality of blocks is classified into audio information, video information and system information in block units, and the classified audio information, video information and system are classified. Information is recorded on a recording medium in block units. At this time, the audio information, the video information, and the system information which are classified and recorded into the audio information, the video information, and the system information may be reorganized into a predetermined frame format and output as the reproduction information. This enables independent access to audio information, video information, and system information of frame data.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a data recording / reproducing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

(First Embodiment) <Overall Configuration of Data Recording / Reproducing Apparatus> FIG.
1 shows a configuration of a data recording / reproducing apparatus (hereinafter, referred to as “recording / reproducing apparatus”). As shown in FIG. 1, the recording / reproducing apparatus includes an I / O unit 2, a distribution unit 4, a knitting unit 5, a frame buffer 7, a disk medium control unit 8, and a hard disk (HDD) 9 as a disk medium. Consists of

The frame buffer 7 is a data buffer capable of storing one or more frames of data. The I / O unit 2 is a device for inputting and outputting data to and from an external device. I
The / O unit 2 inputs and outputs data to and from an external device in an analog format or a DV format. For example, the I / O unit 2 receives an input from an external device in an analog format through an analog input terminal, and then converts the input into a DV format or an IEEE13
Input in DV format through terminal 94. Data transfer between the I / O unit 2 and the distribution unit 4 during data input;
Alternatively, data transfer between the knitting unit 5 and the I / O unit 2 at the time of data output is performed in the DV format. Writing and reading of data to and from the hard disk 9 are controlled by the disk medium control unit 8. That is, the disk medium control unit 8 controls data transfer between the frame buffer 7 and the hard disk 9.

The distribution unit 4 classifies the DV format frame data input from the I / O unit 2 into audio information, video information and system information, and stores them in the frame buffer 7. The knitting unit 5 creates DV format frame data from data classified and arranged on the frame buffer 7 according to audio information, video information or system information, and outputs the frame data to the I / O unit 2.

<DIF Sequence Configuration> FIG. 2 is a diagram showing a general DIF sequence configuration of the DV format. DIF which is the minimum unit of DV format data
The block is 80 bytes, 150 DIF blocks form one DIF sequence (12,000 bytes), and 10 DIF sequences are unit frames (1
20,000 bytes). The DIF sequence is composed of audio information composed of DIF blocks from A0 to A8, video information composed of DIF blocks from V0 to V134, and a system composed of DIF blocks of H0, SC0, SC1, VA0, VA1, and VA2. And information. Each DIF block unit is input / output in the transfer order shown in FIG.

<Data Arrangement on Frame Buffer> FIG.
FIG. 3 is a diagram showing an arrangement of frame data distributed by the distribution unit 4 on the frame buffer 7. As shown in this figure, the distribution unit 4 on the frame buffer 7
When the DV format data is in the area of the unit frame 14, the audio information 11, the video information 12, and the system information 1
3 and are arranged for each block.

<Structure of Distribution Unit> FIG. 4 is a block diagram showing the structure of the distribution unit 4. The distribution unit 4 includes: a determination unit 20;
It includes a pointer control unit 21, pointers 22 to 25, and block counters 26 to 29.

The determination unit 20 determines the type of the DIF block of the DV format input from the I / O unit 2.
That is, the determination unit 20 determines that the input DIF block is
Blocks constituting audio information (hereinafter, referred to as "audio information blocks"), blocks constituting video information (hereinafter, referred to as "video information blocks"), and blocks constituting system information (hereinafter, referred to as "system information blocks"). Is determined.

The total DIF block counter 26 counts the total number of input DIF blocks. The audio block counter 27 counts the number of input audio information blocks, the video block counter 28 counts the number of input video information blocks, and the system block counter 29 counts the number of input system information blocks. That is,
The total DIF block counter 26 is incremented each time a unit block is processed, and at the same time, each of the block counters 27 to 29 is counted up according to the type of the unit block. That is, in the determination unit 20, the audio block counter 27 is determined when it is determined to be an audio information block, the video block counter 28 is determined when it is determined to be a video information block, and the system block counter 29 is determined when it is determined to be a system information block. Are counted up.

The pointer control unit 21 sets an address of a transfer destination (write destination) when transferring data to the frame buffer 7 in DIF block units. The audio information pointer 22 manages a write address of the audio information. The video information pointer 23 manages a write address of the video information. The system information pointer 24 manages a write destination address of the system information. That is, when the determination unit 20 determines that the input DIF block is an audio block, the pointer control unit 21 replaces the address stored in the audio information pointer 22 with the input DV format DIF block. The address stored in the video information pointer 23 when it is determined to be a video block, and the address stored in the system information pointer 24 when the input DIF block of the DV format is determined to be a system block. Write to the current pointer 25. Current pointer 2
The transfer of the DIF block to the address on the frame buffer 7 indicated by 5 is performed. Each time the transfer of one DIF block ends, the value of the current pointer 25 is counted up by 80 bytes. Therefore, when the transfer of the DIF block ends, the pointer control unit 21
The address at the end of the transfer of the current pointer 25 is written back to any one of the audio information pointer 22, the video information pointer 23, and the system information pointer 24. More specific processing of the distribution unit 4 will be described later.

<Structure of Knitting Unit> FIG. 5 is a block diagram showing the structure of the knitting unit 5. The knitting unit 5 includes a determination unit 30
, A pointer control unit 31, pointers 32-35, and block counters 36-39.

The determination unit 30 determines the type of the DIF block to be fetched next from the frame buffer 7. Total D
The IF block counter 36 counts the total number of processed blocks, and is incremented every time a unit block is processed. Voice block counter 37
Indicates the number of processed audio block information, the video block counter 38 counts the number of processed video block information, and the system block counter 39 counts the number of processed system block information.

The pointer control unit 31 is provided for the frame buffer 7
, The address of the transfer source (read source) when data is transferred in DIF block units. The audio information pointer 32 manages a read start address on the frame buffer 7 when audio information is read from the frame buffer 7. The video information pointer 33 manages a read start address on the frame buffer 7 when reading video information from the frame buffer 7. The system information pointer 34 manages a read start address on the frame buffer 7 when reading system information from the frame buffer 7. The pointer control unit 31 determines the address stored in the audio information pointer 32 when the type of the DIF block to be fetched next is the audio information block by the determination unit 30, and determines that the type of the DIF block is the video information block. If the video information pointer 3
When the type of the DIF block is determined to be the system information block, the address stored in the system information pointer 34 is written to the current pointer 35. After the transfer of the DIF block is completed, the address indicated by the current pointer 35 becomes 80
Since the number of bytes has been counted up, the pointer control unit 31 sets the address of the current pointer 35 at the end of the transfer after the transfer of the DIF block to the corresponding one of the audio information pointer 32, the video information pointer 33, and the system information pointer Write back to pointer. The transfer of the DIF block is executed from the address indicated by the current pointer 25. More specific processing of the knitting unit 5 will be described later.

<Data frame distribution processing by distribution section>
A process performed by the distribution unit 4 when writing data input from an external device via the I / O unit 2 to the frame buffer 7 will be described. FIG. 6 shows an operation algorithm of the distribution unit 4. This processing is executed for each processing of the unit frame data.

First, the total DIF block counter 26 is cleared to zero (S1). Next, the voice information pointer 22,
A transfer start address on the frame buffer 7 is set for the video information pointer 23 and the system information pointer 24 (S2). Next, the determination unit 20 determines whether the DIF block input from the I / O unit 2, that is, the type of the DIF block to be transferred next is any of the audio information block, the video information block, and the system information block. A determination is made (S3). This determination is made based on the transfer order of the DIF blocks of the DV format shown in FIG. 2 and the number of transferred DIF blocks. That is, the distribution unit 4
Has a table indicating the types of DIF blocks in the DV format shown in FIG. 2 and their transfer order, and refers to this table and the value of the DIF block counter 26 to determine the type of DIF block to be transferred next. Can be determined.

Based on the result of the determination, an address pointer is allocated to a setting process according to the type of block to be processed (S4, S5). That is, the address stored in the audio information pointer 22 is written to the current pointer 25 when the audio information block is determined, and the address stored in the video information pointer 23 is written to the current pointer 25 when the audio information block is determined. (S6, S7). If it is determined that the block is a system information block, the address stored in the system information pointer 24 is written to the current pointer 25 (S8).

Then, the DIF block is transferred to the address on the buffer 7 indicated by the current pointer 25 (S9). Thereafter, the transfer of 80 bytes of the unit DIF block is waited for (S10). When the transfer of the DIF block is completed, the count-up address at the time when the transfer of the current pointer 25 is completed is replaced with the transferred DIF.
If the block is a voice information block, voice information pointer 2
If the DIF block is a video information block, it is written back to the video information pointer 23, and if the DIF block is a system information block, it is written back to the system information pointer 24 (S11). Next, the total DIF block counter 26 is incremented (S12). The block counter 27 to 27 corresponds to the type of the DIF block transferred at the same time.
29 is incremented. It is determined whether the transfer for the unit frame has been completed based on the value of the total DIF block counter 26 (S13), and the above processing is repeated until the transfer of the unit frame is completed (S3 to S1).
3).

<Data Frame Knitting Process by Knitting Unit>
Next, a description will be given of a frame knitting process when the knitting unit 5 transfers data from the frame buffer 7 to an external device via the I / O unit 2. The knitting unit 5 creates frame data from information recorded on the frame buffer 7 for each type of information and outputs the frame data to the I / O unit 2. FIG. 7 shows an operation algorithm of the knitting unit 5. This processing is executed for each processing of the unit frame data.

First, the total DIF block counter 36 is cleared to zero (S21). Next, the voice information pointer 3
2. Video information pointer 33, system information pointer 34
, A transfer start address on the frame buffer 7 is set (S22). The determination unit 30 determines whether the DIF block read from the frame buffer 7, that is, the next DIF block to be transferred to the outside is any of the audio information block, the video information block, and the system information block (S23). . The determination unit 30 has a table associating the transfer order and the type of block shown in FIG. 2, and determines the type of the information block to be transferred next from the value of the total DIF block counter 36 with reference to this table. Based on the determination result, the allocation to the address pointer setting process is performed according to the type of the block (S24,
S25). That is, the pointer control unit 31
If the information block to be transferred next is determined to be an audio information block by 0, the address stored in the audio information pointer 32 is written into the current pointer 35 (S
26) If it is determined that the block is a video information block, the address stored in the video information pointer 33 is written to the current pointer 35 (S27). If it is determined that the block is a system information block, the address is stored in the system information pointer 34. The current address is written to the current pointer 35 (S28).

The transfer of the DIF block is executed from the address on the buffer 7 indicated by the current pointer 35 (S29), and then the transfer of the unit DIF block 80 bytes is waited for (S30). When the transfer of the DIF block is completed, the address of the current pointer 35 at the end of the transfer is set to the audio information pointer 32 if the transferred DIF block is the audio information block, to the video information pointer 33 if the transferred DIF block is the video information block, and to the system information block. If so, it is written back to the system information pointer 34 (S31).
Then, the total DIF block counter 36 is incremented (S32). At the same time, the block counters 37 to 39 are incremented according to the type of the transferred DIF block. It is determined whether the transfer for the unit frame has been completed based on the total DIF block counter value (S
33) The above processing (steps S23 to S33) is repeated until the transfer of the unit frame is completed.

<Structure of Disk Medium Control Unit> FIG. 8 is a block diagram showing the structure of the disk medium control unit 8. The disk medium control unit 8 includes a pointer control unit 40, a start pointer 42, counters 43 to 46 and 49, an error block identification flag 47, a medium control unit 41, a start LB
A pointer 48.

The audio information byte counter 44 counts the total number of transfer bytes of the audio information block. The video information byte counter 45 counts the total number of transfer bytes of the video information block. The system information byte counter 46 counts the total number of transfer bytes of the system information block.
The start LBA pointer 48 indicates the transfer start LBA (Logical
block Address: logical block address).
The LBA (logical block address) is a number continuously assigned to a sector which is the minimum access unit, and the LBA is used for writing to a disk medium,
The data transfer start sector position in the read operation is specified.

The pointer control unit 40 controls writing and reading operations to and from the frame buffer 7, and starts writing from the start address stored in the start pointer 42.
Start reading. The pointer control unit 40 stops the pointer operation of the start pointer 42 when there is no more valid data.

The medium control unit 41 has a start LBA pointer 4
The transfer sector counter 43 sets the total number of transfer sectors for each information block based on the values of the audio information byte counter 44, the video information byte counter 45, and the system information byte counter 46 from the transfer start LBA stored in No. 8 And the number of remaining bytes less than the unit sector is set in the effective byte counter 49, and these counters 43,
The data transfer between the frame buffer 7 and the hard disk 9 is controlled with reference to the value of 49.

The error block identification flag 47 is a flag indicating the type of information block in which an error has occurred when an error has occurred during reading, and is used when dealing with an error. This error flag will be described in detail in Embodiment 4.

<Process of Writing Data to Hard Disk by Disk Medium Control Unit> The process of writing data from the frame buffer 7 to the hard disk 9 by the disk medium control unit 8 will be described. FIG. 9 shows a write operation algorithm of the disk medium control unit 8. This writing process is executed for each unit frame data process.

First, a transfer sector counter 43 for counting the number of sectors to be transferred, and a valid byte counter 49 for counting the number of valid bytes in the last sector of the transfer sector.
Are cleared to zero (S41). Next, the total number of transfer bytes of each information block is set (S42). In particular,
The total number of transfer bytes of the audio information block is set in the audio information byte counter 44, the total number of transfer bytes of the video information block is set in the video information byte counter 45, and the total number of transfer bytes of the system information block is set in the system information byte counter 46. I do. Next, the transfer start LBA is set to the start LBA.
It is set to the pointer 48 (S43). Start pointer 42
The transfer start address for the transfer from the frame buffer 7 is set in (S44). Thereafter, the audio information byte counter 44, the video information byte counter 45, and the system information byte counter 46 are respectively set as arguments, and a block write process to a hard disk, which will be described later, is executed (S45, S46, S47), and the unit frame process is performed. Complete.

FIG. 1 shows the process of writing a block to a hard disk in steps S45, S46 and S47.
0 will be described.

In the block write processing to the hard disk, first, a quotient obtained by dividing the value of the information byte counter specified as an argument by the number of bytes of the unit sector is set in the transfer sector counter 43 as the total number of transfer sectors (S5).
0). Next, the remainder obtained by dividing the value of the information byte counter specified as the argument by the number of bytes in the unit sector is set in the effective byte counter 49 (S51). Thereafter, data transfer to the hard disk 9 is started (S52). Each time a unit sector is transferred, the transfer sector counter 43 is decremented (S53), and when the transfer sector counter 43 becomes zero, the process proceeds to step S54. In step S54, the valid byte counter 49 is decremented every time a unit byte is transferred, and the valid byte counter 4 is decremented.
When the value of 9 becomes zero, the flow shifts to step S55. In step S55, the pointer control unit 40 stops the operation of the address pointer of the frame buffer 7. And
The process waits for the end of the transfer of the last sector (S56), and ends the process when the transfer is completed.

<Process of Reading Data from Hard Disk by Disk Medium Control Unit> The process of reading data from the hard disk 9 to the frame buffer 7 by the disk medium control unit 8 will be described. FIG. 11 shows a read operation algorithm of the disk medium control unit 8. This reading process is executed for each unit frame data process.

First, the transfer sector counter 43 for counting the number of transfer sectors and the valid byte counter 49 for counting the number of valid bytes in the last sector are cleared to zero (S61). Next, the total number of transfer bytes of each information block is set (S62). Specifically, the total number of transfer bytes of the audio information block is stored in the audio information byte counter 44, the total number of transfer bytes of the video information block is stored in the video information byte counter 45, and the total number of transfer bytes of the system information block is stored in the system information byte counter 46. Set each. next,
The transfer start LBA is set in the start LBA pointer 48 (S63). Next, a transfer start address for transfer to the frame buffer 7 is set in the start pointer 42 (S
64). Thereafter, the audio information byte counter 44, the video information byte counter 45, and the system information byte counter 4
With the values of S.6 and S.6 as arguments, respectively, a block reading process from the hard disk described later is executed (S65, S66,
S67), the unit frame processing is completed.

The details of the process of reading blocks from the hard disk in steps S65, S66, and S67 will be described with reference to the flowchart of FIG.

In the process of reading blocks from the hard disk, a quotient obtained by dividing the information byte counter value specified as the argument by the number of bytes of the unit sector is set as the total number of transfer sectors in the transfer sector counter 43 (S70). Next, the remainder obtained by dividing the value of the information byte counter specified as the argument by the number of bytes of the unit sector is set in the valid byte counter 49 (S71). Then, transfer to the frame buffer 7 is started (S72), and thereafter, the transfer sector counter 43 is decremented every unit sector transfer (S73). When the transfer sector counter 43 becomes zero, the valid byte counter 49 is decremented every unit byte transfer (S74). Effective byte counter 4
When 9 becomes zero, the operation of the address pointer of the frame buffer 7 is stopped by the pointer control unit 40, and the data transfer operation to the frame buffer 7 is stopped by the medium control unit 41 (S75). Thereafter, the transfer of the last sector is waited for (S76), and the transfer ends.

As described above, when data recorded in the DV format in which audio information, video information, and system information are mixed is read from or written to a recording medium, classification is performed according to the type of each information block. Then, by arranging them in the frame buffer, writing and reading operations can be performed for each type of information block. The present invention is not limited to the DV format, and can be applied to any data transfer format in which data is transferred in units of data frames composed of different types of information.

(Embodiment 2) In this embodiment,
The audio editing process and the video editing process for the data recorded on the hard disk 9 will be specifically described. Note that the hardware configuration of the recording / reproducing apparatus of the present embodiment is the same as that of the first embodiment.

<Sound Editing Process> First, the sound editing process will be described. When the audio editing process is performed, the audio information block of the audio information 11 needs to be stored on the frame buffer 7. That is, it is necessary that the frame data of the DV format based on the analog input or the DV input be arranged for each information block on the frame buffer 7 using the distribution unit 4. Alternatively, only the input audio information needs to be converted to the DV format and arranged on the frame buffer 7 in the form of an audio information block.

FIG. 13 is a diagram showing an audio editing processing algorithm in the disk medium control unit 8. Each time the audio information data of the unit frame is changed, this audio editing process is executed.

First, the transfer sector counter 43 for counting the number of transfer sectors and the valid byte counter 49 for counting the number of valid bytes in the last sector are cleared to zero in the disk medium control section 8 (S81). Next, the total number of transfer bytes of the audio information block is set (S82).
That is, the total number of transfer bytes of the audio information block is set in the audio information byte counter 44. Next, transfer start LB
The start LBA of the audio information block is set in the start LBA pointer 48 as A (S83). The start address of the audio information block on the frame buffer 7 is set to the start pointer 42 (S84). Then, the above-described block writing process (see FIG. 10) is executed using the value of the audio information byte counter 44 as an argument (S85). This allows
Only the audio information block is rewritten on the hard disk 9. Thus, audio editing can be realized by replacing only the audio information block.

Conventionally, in audio editing in which only audio information is rewritten, it is necessary to read out frame data in the frame buffer once, rewrite the audio information, and then write the frame data. Processing speed and processing efficiency can be improved because it can be realized by rewriting only the audio information block instead of all data.

<Video Editing Process> Next, the video editing process will be described. When performing the video editing process, it is necessary for the frame buffer 7 to store a video information block of video information to be rewritten and a system information block of system information. That is, on the frame buffer 7, it is necessary that the data of the DV format by the analog input or the DV input be arranged for each block using the distribution unit 4. Alternatively, only the video information needs to be converted into the DV format and arranged in the form of a video information block and a system information block.

FIG. 14 is a diagram showing a video editing processing algorithm. This video editing process is executed each time the video information and system information data of a unit frame are changed.

First, the transfer sector counter 43 for counting the number of transfer sectors and the valid byte counter 49 for counting the number of valid bytes in the last sector are cleared to zero (S91). Next, the total number of transfer bytes of the video information block is set (S92). That is, the total number of transfer bytes of the video information block is set to the video information byte counter 45, and the total transfer byte number of the system information block is set to the system information byte counter 46. The start LBA of the video information block is set in the start LBA pointer 48 as the transfer start LBA (S93). The start address of the video information block on the frame buffer 7 is set in the start pointer 42 (S94). The block writing process shown in FIG. 10 is executed using the value of the video information byte counter 45 as an argument (S95). Further, a block write process shown in FIG. 10 is executed using the value of the system information byte counter 46 as an argument (S96). Thereby, the video information block and the system information block are rewritten on the hard disk 9. Thus, video editing can be realized by replacing only the video information block and the system information block.

Conventionally, a video insert function for rewriting only video information is to read frame data once into a frame buffer, rewrite the video information on the frame buffer to reorganize the frame data, and then write the frame data to a hard disk. Although it was necessary, according to the present invention, the processing speed and the processing efficiency can be improved because it can be realized by rewriting only the video information block and the system information block.

(Embodiment 3) In this embodiment, recording and reproducing operations in the audio information mode will be described. here,
The audio information mode is an operation mode in which only the audio information of the information included in the data frame is recorded on the hard disk 9.

First, the recording operation in the audio information mode, that is, the processing when only the audio information is recorded on the hard disk 9 will be described.

FIG. 15 shows a writing algorithm in the audio information mode. The writing algorithm in the present sound recording mode is executed every time sound information and system information data of a unit frame are written to the hard disk 9.

First, the transfer sector counter 43 for counting the number of transfer sectors and the valid byte counter 49 for counting the number of valid bytes of the last sector are cleared to zero (S101). Next, an initial value is set in each byte counter (S102). Specifically, the total number of transfer bytes of the audio information block is set in the audio information byte counter 44, and the total number of transfer bytes of the system information block is set in the system information byte counter 46. Next, the start LBA of the audio information block is set as the start LBA pointer 48 as the transfer start LBA.
Is set (S103). The start address of the audio information block on the frame buffer 7 is set to the start pointer 42 (S104). The block writing process shown in FIG. 10 is executed using the value of the audio information byte counter as an argument (S105). Frame buffer 7 at start pointer 42
The start address of the above system information block is set (S106). The block write process shown in FIG. 10 is executed using the value of the system information byte counter as an argument (S107). As described above, only the audio information and the system information are recorded on the hard disk 9. No video information is recorded.

Next, a process for reproducing data recorded in the audio information mode from the hard disk 9 will be described.

FIG. 16 is a diagram showing a reading algorithm in the audio information mode. The reading algorithm in the sound recording mode is executed every time the sound information and the system information data of the unit frame are read from the hard disk 9.

First, the transfer sector counter 43 for counting the number of transfer sectors and the valid byte counter 49 for counting the number of valid bytes in the last sector are cleared to zero (S111). Next, an initial value is set in each byte counter (S112). Specifically, the total number of transfer bytes of the audio information block is set in the audio information byte counter 44, and the total number of transfer bytes of the system information block is set in the system information byte counter 46. Next, as the transfer start LBA,
Start LB is a value obtained by adding the start LBA value of the system information block to the start LBA value of the audio information block.
It is set in the A pointer 48 (S113). The start address of the audio information block on the frame buffer 7 is set in the start pointer 42 (S114). Using the value of the audio information byte counter 44 as an argument, a block reading process (see FIG. 12) is executed (S115), and the audio information is read onto the frame buffer 7. Next, the start address of the system information block on the frame buffer 7 is set to the start pointer 42 (S116). Using the system information byte counter 46 as an argument, block read processing (FIG. 12)
(See step S117), and the system information is read out to the frame buffer 7. Thereafter, since the video information does not exist on the hard disk 9, the dummy data is stored in the area of the video information 12 on the frame buffer 7 shown in FIG. 3 (S118). At this time, the dummy data may be any data indicating that it is a DIF block of video information. After that, these data read out on the frame buffer 7 are organized in the DV format by the organization unit 5. In this manner, audio information can be reproduced in the DV format using only the audio information and system information on the hard disk 9.

In the above case, the system information need not be written on the hard disk 9 (disk medium) as in the case of the video information. In that case, at the time of reading, by creating dummy data for the system information, the audio information can be reproduced in the DV format. Further, the system information block may be controlled so that the dummy video information is not output as noise.

In the above description, the hard disk 9
Although the case where only audio information is recorded and reproduced is described above, the case where only video information is recorded and reproduced can be realized in the same manner as the case of only audio information.

(Embodiment 4) An error handling process at the time of the reproducing process of the recording / reproducing apparatus according to the present invention will be described. FIG. 17 shows an error handling algorithm of the reproduction process. This process is executed by the disk medium control unit 8 every time the unit frame data is read. That is, referring to the error block identification flag 47 (see FIG. 8), reading of the audio information block, reading of the video information block, or
It is determined whether an error has occurred in reading the system information block (S121, S122, S123).
If we determine that an error has occurred in the audio information block,
The audio information block is read again, or dummy data for the audio information block is created, and dummy data processing for writing the data on the frame buffer is performed (S124). If it is determined that an error has occurred in the video information block,
The video information block is re-read and the dummy data processing for the video information is performed (S125). When it is determined that an error has occurred in the system information block, rereading of the system information block and dummy data processing for the system information are performed (S126).

The above dummy data processing includes:
Data indicating that each block is a DIF block is written to the corresponding area of the frame buffer 7 or a valid identical frame adjacent to the frame on which an error has occurred on the frame buffer 7 when the pointer is set in step S22 of the algorithm in FIG. A method of designating the start address of the information block can be considered.

As described above, when rereading is performed when an error occurs, correct data can be read. When creating dummy data when an error occurs, data in which an error has occurred cannot be read. Other data that can be read normally other than the above can be processed thereafter. In this way, for an error that occurs when data is reproduced from the recording medium (HDD), error countermeasure processing can be performed on a block-by-block basis by utilizing the information block data that can be normally read.

[0071]

As described above, according to the disk medium recording / reproducing apparatus of the present invention, the audio information, video information, and system information constituting the frame data can be accessed for each type. It is possible to improve the processing speed and processing efficiency at the time, to improve the use efficiency of the recording area in the time lapse and audio recording modes, and to perform the optimal error handling processing that can output the data of the normal block when an error occurs.

[Brief description of the drawings]

FIG. 1 is a block diagram of a data recording / reproducing apparatus according to the present invention.

FIG. 2 is a configuration diagram of DV format data.

FIG. 3 is a diagram illustrating a state where audio information, video information, and system information constituting frame data are distributed and arranged on a frame buffer.

FIG. 4 is a block diagram of a distribution unit of the data recording / reproducing apparatus.

FIG. 5 is a block diagram of a knitting unit of the data recording / reproducing apparatus.

FIG. 6 is a flowchart of a distribution algorithm.

FIG. 7 is a flowchart of a knitting algorithm.

FIG. 8 is a block diagram of a disk medium control unit of the data recording / reproducing apparatus.

FIG. 9 is a main flowchart of a writing algorithm of a disk medium control unit.

FIG. 10 is a flowchart of a subroutine of a writing process of a disk medium control unit.

FIG. 11 is a main flowchart of a reading algorithm of a disk medium control unit.

FIG. 12 is a flowchart of a subroutine of a reading process of a disk medium control unit.

FIG. 13 is a flowchart of an audio editing processing algorithm of the data recording / reproducing device according to the second embodiment.

FIG. 14 is a flowchart of a video editing processing algorithm of the data recording / reproducing device according to the second embodiment.

FIG. 15 is a flowchart of a writing algorithm in a sound recording mode of the data recording / reproducing apparatus according to the third embodiment.

FIG. 16 is a flowchart of a reading algorithm in a sound recording mode of the data recording / reproducing device according to the third embodiment.

FIG. 17 is a flowchart of an error countermeasure algorithm of a reproducing process of the data recording / reproducing device in the fourth embodiment.

[Explanation of symbols]

 2 I / O unit 4 Distribution unit 5 Knitting unit 7 Frame buffer 8 Disk medium control unit 9 HDD 11 Audio information 12 Video information 13 System information 14 Unit frame 20, 30 Judgment unit 21, 31 Pointer control unit 22, 32 Audio information pointer 23, 33 Video information pointer 24, 34 System information pointer 25, 35 Current pointer 26, 36 Total DIF block counter 40 Pointer control unit 41 Medium control unit 42 Start pointer 43 Transfer sector counter 44 Audio information byte counter 45 Video information byte counter 46 System information byte counter 47 Error block identification flag 48 Start LBA pointer 49 Valid byte counter

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 20/18 550 G11B 20/18 574A 570 H04N 5/781 510F 574 G11B 27/02 A 27/031

Claims (15)

[Claims] 1. An I / O means for inputting and outputting video information to and from an external device, a recording medium for recording video information input from the external device via the I / O means, and a recording medium for recording on the recording medium A data buffer for temporarily storing video information to be recorded or video information read from the recording medium; and, when recording data, converting frame data of video information input via the I / O means into audio information, video information or system information. A frame data distribution unit that classifies the information into the data buffer and arranges the audio information, the video information, and the system information that are classified and arranged in the data buffer into a predetermined frame format during data reproduction; Audio data and video data between the data buffer and the recording medium when recording or reproducing data. Information and data recording and reproducing apparatus characterized by comprising a transfer control means for transferring system information in those blocks. 2. The method according to claim 1, wherein at the time of video editing, the transfer control means replaces the video information block recorded in the data buffer with a video information block portion of frame data on the recording medium and records the data on the recording medium. The data recording / reproducing apparatus according to claim 1, wherein 3. During audio editing, the transfer control means replaces an audio information block recorded in a data buffer with an audio information block portion of frame data on the recording medium and records the data on the recording medium. The data recording / reproducing apparatus according to claim 1, wherein 4. The data recording / reproducing apparatus according to claim 1, wherein at the time of data recording, said transfer control means records only a video information block and a system information block on a data buffer on said recording medium. 5. At the time of data reproduction, the transfer control means reads out a video information block and a system information block recorded on a recording medium on a data buffer, creates dummy audio information as an audio information block, and 2. The data recording / reproducing apparatus according to claim 1, wherein the data organizing means creates frame data from the read video information block and system information block and the created dummy audio information. 6. The data recording / reproducing apparatus according to claim 1, wherein at the time of data recording, the transfer control means records only the audio information block and the system information block on the data buffer on the recording medium. 7. At the time of data reproduction, the transfer control means reads out an audio information block and a system information block recorded on a recording medium into a data buffer, creates dummy video information in a video information block portion, and 2. The data recording / reproducing apparatus according to claim 1, wherein the knitting means creates frame data from the read audio information block, the system information block, and the created video information block. 8. The data recording / reproducing apparatus according to claim 1, further comprising an error block judging means for judging a block in which an error has occurred when an error occurs during reproduction from the recording medium. 9. A noise prevention means for preventing noise from occurring in a frame including the video information block when the error block determination means determines that an error has occurred in the video information block during reproduction from a recording medium. The data recording / reproducing apparatus according to claim 8, further comprising: 10. A noise preventing means for preventing noise from occurring in a frame including the audio information block when the error block determining means determines that an error has occurred in the audio information block during reproduction from a recording medium. The data recording / reproducing apparatus according to claim 8, further comprising: 11. A noise prevention means for preventing occurrence of noise in a frame including the system information block when the error block determination means determines that an error has occurred in the system information block during reproduction from a recording medium. The data recording / reproducing apparatus according to claim 8, further comprising: 12. A recording medium for recording video information inputted from the outside, and a data buffer for temporarily storing data to be recorded on the recording medium, wherein a DV format of the DV format obtained based on the inputted video information is provided. When temporarily storing the frame data in the data buffer, the data is classified into audio information, video information and system information, and is arranged at a predetermined position on the data buffer. A data recording / reproducing apparatus, which divides and records each block of the obtained audio information, video information and system information in sector units defined by a recording medium. 13. A recording medium comprising: a recording medium for recording frame data of a DV format composed of a plurality of blocks for each block; and a data buffer for temporarily storing data read from the recording medium. In reading frame data of
The data is read out in the order of the recorded blocks, classified according to the type of data, and recorded on the data buffer. When the data is output from the data buffer to an external device, the data classified according to the type in the data buffer is re-formatted into the DV format. A data recording / reproducing device, comprising and outputting. 14. Classifying frame information of video information composed of a plurality of blocks into audio information, video information and system information on a block basis, and classifying the classified audio information, video information and system information on a recording medium in block units. A data recording / reproducing method characterized by recording. 15. The audio information, the video information, and the system information, which are classified and recorded as audio information, video information, and system information, are reorganized into a predetermined frame format and output as reproduction information. Item 15. The data recording / reproducing method according to Item 14.