KR100354316B1 - digital data record/play apparatus and data processing method thereof - Google Patents

Abstract

The present invention discloses a digital data recording / reproducing apparatus and a data recovery method of the apparatus. The device indicates the chapter attribute table area for recording the number of recorded chapters, the total number of pages used, and the entry number of the data block positioning table specifying the chapter start position in the data area of each chapter, the next block address of the chapter. A data block positioning table area for storing data indicating chain block number and the last block of chapters, and a memory having a data area for recording digital data, and the number of recorded chapters when power is supplied again after the power is cut off during recording. Is increased by 1, the entry number of the data block positioning table specifying the chapter start position of the chapter 1 increased in the chapter attribute table area is recorded, and the data indicating the last block of the chapter 1 increased in the data block positioning table area is recorded. If not written, data block positioning table Search for the block in the data area that corresponds to the chain block number of the incremented chapter stored in reverse, and if no data is recorded in that block, enter the number of recorded chapters and total number of pages in the chapter attribute table area for the incremented chapter. And a control unit for updating and recording data indicating the last block in the data block positioning table area. Therefore, even if the power is cut off during recording, if the power is supplied again, the recorded data can be restored until the power is cut off.

Description

Digital data record / play apparatus and data recovery method thereof

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital data recording / reproducing apparatus, and more particularly, to a digital data recording / reproducing apparatus capable of restoring recorded data until power is cut off even when the power is cut off during data recording. It relates to a data recovery method.

The conventional digital data recording / reproducing apparatus encodes data applied from the outside during recording and records the data in a memory, and during reproduction, decodes the data recorded in the memory and outputs the data to the outside.

Conventional digital data recording / reproducing apparatus for recording digital data in a flash memory requires memory management in order to record and read digital data continuously input into the memory.

Accordingly, the conventional digital data recording / reproducing apparatus has a memory management area inside the memory and manages the memory by a central processing unit (CPU) which is a control means.

However, a conventional digital data recording / reproducing apparatus for recording digital data using a flash memory has a problem in that the recorded data cannot be recovered until the power is cut off when the power is cut off during data recording.

In the flash memory, when data is to be recorded due to the characteristics of the memory itself, new data must be written after erasing data in the memory area to be written.

However, if the power is cut off while the digital data is being recorded, and then the power is supplied again, the newly recorded digital data is overwritten in the data recording area of the memory where the data is recorded before the power is cut off. Therefore, newly recorded digital data is not recorded properly.

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital data recording / reproducing apparatus capable of recovering digital data recorded before power is cut off when power is supplied again when power is cut off while digital data is being recorded.

Another object of the present invention is to provide a data recovery method of an apparatus for achieving the above object.

The digital data recording / reproducing apparatus of the present invention for achieving the above object is a signal input / output means for inputting / outputting an analog signal, the analog signal input from the signal input / output means is encoded and converted into digital data, Encoding / decoding means for decoding digital data, converting it into an analog signal, and outputting the signal to the signal input / output means, a data block for designating a chapter start position, a total number of pages used, and a chapter start position in the data area of each chapter. The chapter attribute table area for recording the entry number of the positioning table, the chain block number indicating the next block address of the chapter and the data block positioning table area for storing data indicating the last block of the chapter, and the encoding / decoding means Day for recording the encoded digital data Data storage means having a recording area, and data which increases the number of the recorded chapters by one when power is supplied again after the power is cut off during recording, and designates a chapter start position of the increased chapter in the chapter attribute table area. If the entry number of the block positioning table is recorded and data indicating that the last block of the one increased chapter is not recorded in the data block positioning table area, the data of the one increased chapter stored in the data block positioning table area is not recorded. Search for a block of the data area corresponding to the chain block number and update the number of recorded chapters and the total number of pages used in the chapter attribute table area for the one increased chapter if no data is recorded in the corresponding block; Indicate the last block in the data block positioning table area It is characterized by comprising a control means for recording data.

The data recovery method of the digital data recording / reproducing apparatus of the present invention for achieving the above another object comprises a chapter attribute table area for recording the number of recorded chapters, the total number of pages used, and the starting data block position designation number of each chapter, and Digital data of a digital data recording / reproducing apparatus having a data block means having a chain block number of a chapter, a data block positioning table area for recording data indicating the last block, and a data area for recording digital data. In the recovery method, when the power is supplied again after the power is cut off during recording, the number of the recorded chapters is increased by one, and the chapter of the data block positioning table which designates the chapter start position of the increased chapter is specified in the chapter attribute table area. The entry number is recorded and the data block positioning table zero A judgment step of determining whether data indicating the last block of the one increased chapter is recorded; and if the determination step is not satisfied, a chain block number of the one increased chapter stored in the data block positioning table area; Search for a block of the data area corresponding to and update the number of recorded chapters and the total number of pages used in the chapter attribute table area for the increased chapter if data is not recorded in the corresponding block; And a data recovery step of restoring the data of the data area by recording data indicating the last block in the positioning table area.

1 is a block diagram showing a general configuration of a conventional digital data recording / reproducing apparatus.

FIG. 2 shows a memory area configuration of the embodiment of the flash memory shown in FIG.

FIG. 3 shows a lead-in data area configuration of the embodiment of the flash memory shown in FIG.

FIG. 4 shows the structure of the chapter attribute table CAT of the embodiment of the flash memory shown in FIG.

FIG. 5 shows the configuration of the data block positioning table DBIT of the embodiment of the flash memory shown in FIG.

FIG. 6 is a diagram for explaining a method of configuring data of a chapter attribute table CAT and a data block positioning table DBIT.

FIG. 7 shows a change in the data area of the flash memory by the method of FIG.

8 is an operation flowchart for explaining a data recovery method of the digital data recording / reproducing apparatus of the present invention.

FIG. 9 is a view for explaining a method of configuring data of a chapter attribute table CAT and a data block positioning table DBIT by a data recovery method of the digital data recording / reproducing apparatus of the present invention.

FIG. 10 shows a change in the data area of the flash memory by the method of FIG.

Hereinafter, a digital data recording / reproducing apparatus and a data recovery method of the apparatus will be described with reference to the accompanying drawings.

1 is a block diagram showing the configuration of a general digital data recording / reproducing apparatus, which includes a microphone 10, amplifiers 12 and 20, an encoder and decoder 14, a central processing unit 16, and a flash memory 18. , And a speaker 22.

The function of each of the blocks shown in FIG. 1 will be described below.

The microphone 10 inputs an analog signal as data input means. The amplifier 12 amplifies the analog signal. The encoder and decoder 14 encode an analog signal, convert it into digital data, and decode the digital data into an analog signal. The central processing unit 16 writes the digital data input from the encoder and the decoder 14 to the flash memory 18, and outputs the digital data read from the flash memory 18 to the encoder and the decoder 14. The memory 18 is controlled and managed.

Fig. 2 shows the memory area division of the embodiment of the flash memory 18 shown in Fig. 1, and shows a memory area division when the flash memory having a capacity of 16M is applied to the voice recorder as an example.

Flash memory consists of a memory management area and a data area. The memory management area includes a lead-in data area, a chapter attribute table (CAT) area, and a data block index table (DBIT) area. The memory management area further comprises an area for recording a copy of the same contents.

This means that the data recorded in the memory management area must be updated by the central processing unit. In order to update, the data must be provided with an area for recording a copy of the same contents.

In other words, the central processing unit obtains and updates the data recorded in the memory management area, and erases the data recorded in the memory management area. The data recorded in the updated data and the area in which a copy of the memory management area is recorded are recorded in the memory management area. Then, the data in the area where the copy of the memory management area is recorded is erased, and the data recorded in the memory management area is recorded in the area where the copy of the memory management area is recorded.

In the flash memory of the embodiment, since data is erased in units of blocks when data is erased, there is an area in which blocks of a memory management area and a copy of the memory management area are recorded.

Now, the area classification of the flash memory having the capacity of 16M shown in Fig. 2 is explained as follows.

Flash memory with a capacity of 16M consists of 1024 blocks, one block is 32 pages and one page is 512 bytes.

The first one of the 1024 blocks is a memory management area, the next one is an area where a copy of the memory management area is written, and the remaining 1022 blocks are data areas.

One page of each of the areas where the memory management area and the copy of the memory management area are recorded is a lead-in data area, the next four pages are chapter attribute table data areas, and the remaining pages are data block positioning table data areas. Used as

FIG. 3 shows the data structure of the embodiment of the lead-in data area shown in FIG. 2, wherein the lead-in data area is composed of 256 bytes in total, 44 bytes of which format version information is recorded, and one byte is a bad block. The total number is recorded, and 128 bytes is an area in which the address of a bad block is recorded. The remaining area is an unused area.

The format version information is data indicating version information for future improvement. The total number of bad blocks represents the number of bad blocks in the flash memory, and increases each time a bad block appears. The bad block address indicates the start address of the bad block in the flash memory.

Fig. 4 shows the data structure of the embodiment of the chapter attribute table area shown in Fig. 2, which records the number of recorded chapters, the total number of used blocks, the start data block position designation (DBIT) number of each chapter, and the number of used pages of each chapter. It is an area.

Each of these data is recorded in two bytes.

In Fig. 4, the first two bytes are an area in which the total number of recorded chapters is recorded. The second 2 bytes is an area in which the total number of used blocks is recorded, indicating how many of the 1022 blocks are used. The start DBIT number of each chapter is an area in which a DBIT entry number specifying the start position of the chapter of the data recording area of the flash memory is recorded. The number of pages used in each chapter is an area in which the total number of pages used for generation of chapters is recorded. The starting DBIT number of each chapter and the number of pages used in each chapter are made up of 2 bytes, and these data are recorded in order.

Fig. 5 shows the configuration of an embodiment of the data block positioning table shown in Fig. 2, and the numbers in parentheses indicate the entry numbers of the data block positioning table DBIT. A chain address consisting of two bytes is recorded in each entry number.

In Fig. 5, the entry number and chain address written in the DBIT mean a block address of the flash memory.

FIG. 6 is a diagram for explaining a data configuration method of a chapter attribute table CAT and a data block positioning table DBIT.

6 (a) and 6 (b) show changes in the chapter attribute table CAT, and FIGS. 6 (c) and 6d show changes in the data block positioning table DBIT. The data recorded in each table represents data recorded in accordance with the data recording formats of Figs. 4 and 5 described above, and data is recorded in the forms of 0 and 1. In the figure, data is expressed in hexadecimal notation, and " FFFF " means an area in which data is not recorded.

7 (a) and 7 (b) show changes in the data area of the flash memory.

Assuming that data has been recorded in the chapter attribute table CAT and the data block positioning table DBIT as shown in Figs. 6A and 6C, the following description will be given.

When the power is supplied again, since the recording area of the start DBIT number of the second chapter in the CAT of Fig. 6 (a) is indicated as "FFFF", the "FFFF of DBIT of Fig. 6 (c) is used to record data in the second chapter. The entry number 1 indicated by " As shown in Fig. 6B, " 0001 " is recorded in the second chapter start DBIT number recording area in the CAT. As shown in Fig. 7B, digital data is recorded in the hatched block address " 0001 " in the data area. As shown in Fig. 6C, an unused entry number 3 in the DBIT is searched. As shown in Fig. 6D, the chain address " 0003 " is recorded in the entry number 1 in the DBIT, and the next digital data is recorded in the next hatched block address " 0003 " in the data area as shown in Fig. 7B. Record it. Search for an unused entry number 5 in the DBIT. As shown in Fig. 6D, the chain address " 0005 " is recorded in the entry number 3 in the DBIT, and the next digital data is recorded in the block address " 0005 " Search for an unused entry number 127 in the DBIT. As shown in Fig. 6D, the chain address " 007F " is recorded in the entry number 5 in the DBIT, and the next digital data is recorded in the block address " 007F " of the data area as shown in Fig. 7B. . If data recording is terminated by recording digital data at the block address " 007F ", the unused entry number 127 in the DBIT is searched to record data indicating that it is the last block.

Then, as shown in Fig. 6B, the total used page number " 0070 " is recorded in the used page number recording area of the second chapter in the CAT.

Next, the data of the total recording chapter number recording area in the CAT is updated from "0001" in FIG. 6 (a) to "0002" in FIG. 6 (b), and the total number of used blocks is "0300" in FIG. 6 (a). Is updated to " 0304 " as shown in Fig. 6B.

One chapter is generated by performing the above operation.

When the chapters are generated, as described above, the total number of recorded chapters and the total number of used blocks in the CAT increases, on the contrary, when the chapters are erased, the total number of recorded chapters and the total number of used blocks decrease, and the data in the CAT is prematurely recorded and the chapter number Is reassigned.

On the other hand, during reproduction, the digital data is read while searching for the block address specified in the chapter attribute table CAT and the data block positioning table DBIT.

As can be seen from the above description, the entry number of the data block positioning table (DBIT) is recorded in the start DBIT number recording area of the corresponding chapter where recording in CAT is performed when digital data is recorded, and the chain number recording area in the DBIT is recorded. The next entry number not used is recorded. The entry number in the DBIT means the block number. When the recording is finished, the chapter is generated by updating the number of recorded chapters, the total number of used blocks, and the number of pages used in the chapter.

However, if the power is cut off during recording, there will be no recording of the number of recorded chapters in the CAT, the total number of used blocks, and the number of pages used in the chapter, and there will be no record of the last chapter in the DBIT.

Thus, the next time the power is reapplied, the chapters being recorded are reassigned and recorded.

Therefore, in the conventional digital data recording / reproducing apparatus, if the power is cut off during recording, the digital data recorded until the interruption cannot be recovered.

In addition, since newly recorded data is re-recorded in the data area of the chapter being recorded, there is a problem that newly recorded data cannot be properly recorded.

FIG. 8 is an operation flowchart for explaining a data recovery method of the digital data recording / reproducing apparatus of the present invention, which shows the method by which the central processing unit shown in FIG. 1 processes data in the memory management area of the flash memory.

If the power is supplied again after the power is cut off during recording, data is recovered according to the method shown in FIG.

First, a chapter number is increased by one and specified (step 100). At this time, if there were chapters in which recording was not completed before the power was cut off, the chapters are assigned again. This is because the number of recorded chapters in the CAT has not been updated.

Next, it is determined whether the start DBIT number of the chapter is recorded in the CAT (step 110). If the start DBIT number of the corresponding chapter is not recorded as a result of step 110, the operation ends.

If the start DBIT number of the chapter is recorded, it is determined whether the last block is recorded in the DBIT (step 120). If step 120 is satisfied, the operation ends.

If the start DBIT number of the chapter is recorded and the last block is not recorded in the DBIT, it means that the power is cut off during recording. Accordingly, if the operation 110 is satisfied and the operation 120 is not satisfied, the data recovery operation is performed.

If the result of the step 120 is not satisfied, the DBIT entry number of the corresponding chapter is read in the CAT (step 130).

The first page of the block corresponding to the entry number in the DBIT is designated (step 140).

In step 150, it is determined whether data is recorded in the first page of the block written in the entry number of the data recording area of the flash memory.

If step 150 is satisfied, the number of pages used in the corresponding chapter in the CAT is increased (step 160).

Then, the next page is specified (step 170).

It is determined whether the specified page is the last page of the block (step 180).

If it is not the last page of the block, the process proceeds to step 150. If the block is the last page, the DBIT finds the next block number and proceeds to step 140 (step 190).

If the result of performing step 150 is not satisfied, the total number of recorded chapters is recorded in the CAT (step 200).

The total number of pages used in the CAT is recorded (step 210).

Data representing the last block is recorded in the DBIT and the operation ends (step 220).

In other words, in the data recovery method of the digital data recording / reproducing apparatus of the present invention, when the power is cut off during recording and the power is supplied again, it is first determined whether the chapter is the cut-off power during recording. If the chapter is turned off during recording, the chapter is searched up to the area where data is recorded in the data area of the flash memory, and the chapter related information is updated in the CAT and DBIT.

That is, even if the power is cut off during recording and the chapter related data is not updated, the digital data recorded until the power is cut off by performing the method shown in Fig. 8 when the power is supplied again to the chapter which is not composed of the complete chapter. Can be organized into one complete chapter.

FIG. 9 is a view for explaining a method of configuring data of a chapter attribute table CAT and a data block positioning table DBIT by a data recovery method of the digital data recording / reproducing apparatus of the present invention.

(a) and (b) show data changes in CAT when the power is cut off during recording, and (d) and (e) show data changes in DBIT. (B) and (c) show data changes in the CAT at the time of re-supply of power, and (e) and (f) show data changes in the DBIT.

10A and 10B show changes in the data area of the flash memory.

9 and 10 show that power is cut off while digital data is being written to block number " 0003 " in the data area of the flash memory, so that " 0001 " is recorded in the second chapter start DBIT number recording area in the CAT shown in (b). (e), " 0003 " is recorded in the entry number 1 in the DBIT, and as shown in Fig. 10 (b), the data is recorded in the block number " 0001 " and " 0003 " This is to explain how to recover the data until the power is supplied again and the power is cut off.

That is, the operation will be described when the power is cut off while data is being recorded at the second hatched block address in FIG.

When the power is reapplied, the chapter number is increased by one to designate the second chapter. Since the start DBIT number "0001" of the second chapter is recorded in the CAT, and the last block of the second chapter is not recorded in the DBIT, the data recovery operation is performed. The start DBIT number "0001" of the second chapter in the CAT is read out to determine whether data is recorded in the block number "0001". If data is recorded in all pages in the block number " 0001 ", the block number " 0003 " recorded in the entry number 1 in the DBIT is read to judge whether or not the data is recorded in the block number " 0003 ". Since the data in the block number "0003" is recorded and there is no block number recorded in the entry number 3 in the DBIT, as shown in (c), the total number of recorded chapters and the total number of used blocks are "0002", "0302". Is updated to ". Then, as shown in (f), data representing the last block is recorded in the entry number 3 of the DBIT. Thus, the data recorded in the second chapter can be restored to the complete chapter.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. I can understand that you can.

The digital data recording / reproducing apparatus of the present invention and the data recovery method of the apparatus can recover the recorded data until the power is cut off even if the power is supplied again even if the power is cut off during recording.

In addition, by restoring the recorded data until the power is cut off, it is possible to prevent the problem that the newly recorded data is not properly recorded because the data is re-recorded in the area where the data is recorded until the power is cut off.

Therefore, the reliability of the device to which the data recovery method of the digital recording / playback apparatus of the present invention is applied can be improved.

Claims (11)

Signal input / output means for inputting / outputting an analog signal; Encoding / decoding means for encoding and converting the analog signal input from the signal input / output means into digital data, decoding the digital data, converting the analog signal into an analog signal, and outputting the analog signal to the signal input / output means; The chapter attribute table area for recording the number of recorded chapters, the total number of pages used, and the entry number of the data block positioning table specifying the chapter start position in the data area of each chapter, the chain block number indicating the next block address of the chapter. And a data block positioning table area for storing data representing the last block of the chapter, and a data area for recording the digital data encoded by the encoding / decoding means. And If the power is supplied again after the power is cut off during recording, the number of the recorded chapters is increased by one, and the entry number of the data block positioning table specifying the chapter start position of the increased chapter is recorded in the chapter attribute table area. If data indicating that the last block of the first increased chapter is not recorded in the data block positioning table area, the data area corresponding to the chain block number of the increased chapter is stored in the data block positioning table area. If a block is searched and no data is recorded in the corresponding block, the record chapter number and the total number of used pages of the chapter attribute table area for the one increased chapter are updated, and the last block in the data block positioning table area is updated. Control means for recording data indicating that Digital data recording / reproducing apparatus, characterized in that. The method of claim 1, wherein the data storage means Digital data recording / reproducing apparatus, characterized in that the flash memory. delete delete delete The method of claim 1, wherein the control means And a chain block number stored in the data block positioning table as a block number of the data area and an entry number of the data block positioning table. The chapter attribute table area for recording the number of recorded chapters, the total number of pages used, and the starting data block positioning number of each chapter, the chain block number of each chapter, and the data block positioning table for recording data indicating the last block. A digital data recovery method of a digital data recording / reproducing apparatus having a data storage means having an area and a data area for recording digital data, If the power is supplied again after the power is cut off during recording, the number of recorded chapters is increased by one, and the entry number of the data block positioning table specifying the chapter start position of the increased chapter is recorded in the chapter attribute table area and A determination step of determining whether data indicating the last block of the first increased chapter is recorded in a data block positioning table area; And If the determination step is not satisfied, the block of the data area corresponding to the chain block number of the increased chapter stored in the data block positioning table area is searched for, and if the data is not written in the corresponding block, the number is increased. A data recovery step of restoring data in the data area by updating the recorded chapter number and the total number of used pages in the chapter attribute table area for the written chapter and recording data indicating that the last block is in the data block positioning table area. Digital data recovery method of the digital data recording / playback device characterized in that it comprises a. The method of claim 7, wherein the data storage means A data recovery method of a digital data recording / reproducing apparatus, characterized by being a flash memory. The method of claim 7, wherein the determining step Incrementing the chapter number by one; Determining whether an entry number of a data block positioning table specifying a chapter start position of the first increased chapter is recorded in the chapter attribute table area; And And determining whether data representing the last block of the first chapter is recorded in the data block positioning table area. The method of claim 7, wherein the data recovery step A chain block number reading step of reading a chain block number of the data block positioning table area of the one increased chapter; A chain block searching step of searching whether data is recorded in a block of the data area corresponding to a chain block number of the data block positioning table area corresponding to the one increased chapter; And And a chapter configuring step of updating the total number of recorded chapters and total number of pages used in the chapter attribute table if the data is not recorded, and recording data indicating that the data is the last block in the data block positioning table. Data recovery method of digital data recording / playback apparatus. 11. The method of claim 10, wherein the chain block searching step And retrieving the chain block number stored in the data block positioning table as the block number of the data area and the entry number of the data block positioning table.