JPH07235170A - Digital recorder - Google Patents

Abstract

PURPOSE:To recover recorded data even when it is erased by an erroneous operation by using recording time data as managing data in a system for initializing data only on a managing area. CONSTITUTION:A CPU 5 sequentially reads recording time data (a) from a head block in a voice data area, reserves it in a work area A of a memory 3, and examines whether values of the data (a) are all '0' or not. Then, if all, the data (a) are not '0', it is compared with a value of recording time data (b) reserved in a work area B. When the value of the data (a) represents new time as compared with the value of the data (b), a content of the work area A is written in the work area B and a work area C for reserving managing data, and '1' is added to a number-of-reading counter D. An address of next recording starting block is calculated from the value of the counter D, the recording time data and the calculated address in the area C are written in a managing area of a recording medium, thereby recovering an erroneous erasing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital recording device.

[0002]

2. Description of the Related Art In a conventional digital recording device, a recording medium is divided into a management area and a voice data area, and at the time of recording,
The voice is recorded for each unit block of the voice data area, and after the recording is stopped, the recording time data for each unit block of the voice data area is collected in the management area and the address to start the recording at the next recording is recorded. is doing. It is not recorded when the data in the management area is empty. At the time of reproduction, random access is made possible by jumping using the position of the management data written in the management area in the management area as an address.

Further, when erasing, only the management area is erased so that the contents of the voice data area are not erased, and it is apparently unrecorded. With this method,
When erasing, only the data in the management area is actually erased, so there is an advantage that the time required for erasing is short, but on the other hand, if the erasing operation is mistakenly performed, the data in the voice data area Since the data remains, the data can be read, but there is a drawback that the random access is disabled and the practicality is impaired.

[0004]

SOLUTION: An audio data area consisting of a plurality of unit blocks on a recording medium and a management area for managing the same are provided, and the audio data area includes audio digital data, time data and management area. Contains address data and time data, and when erased, the management area is erased.In case of erroneous erasure, the recording time data of each block in the voice data area is collected from each block and erased in the management area. It is possible to add an address to this time data by recreating and recording the management data of, and then recording and reproducing by indicating the recordable area.

[0005]

EXAMPLE An example of the present invention will be described. An embodiment using DAT as a recording medium will be described with reference to FIGS. FIG. 1 is a block diagram and FIG. 2 is a flowchart. First,
Work A, work B for storing the recording time data read from each block of the voice data area in the storage device 3, work C for finally saving the management data to be written in the management area,
Readout counter D is prepared and the initial value is 0.
Is set (S1).

Recording time data (hereinafter referred to as data a to n) recorded in each block in the voice data area.
Is the recording time data for display, which is used to display the time at which the data currently being reproduced was recorded on the display 6 during reproduction. This data a is read in order from the first block in the audio data area, stored in the work A (S2), and it is checked whether the values of the data a are all 0 (S3).

In the unrecorded block, the contents of the voice data area are all 0 for both voice data and recording time data. The data a is not 0 because it is the recording time data generated from the recording time. Therefore, if the data a is all 0, the block read here is an unrecorded block, and the next recording start block is this block, so the process proceeds to S7. If the data a is not all 0, the recording time data stored in the work B (hereinafter referred to as data b)
Is compared with the value of (S4).

When the value of the data a represents a new time as compared with the value of the data b, the contents of the work A are written in the work B and the work C. If there is already recorded recording time data in the work C, it is added after that, otherwise it is written at the beginning (S5), and the read number counter D
After adding 1 to (S6), the process returns to S2.

When the value of the data a represents a time older than the value of the data b, the block after that is the block that was previously recorded and remains without being overwritten, and is the next recording start block. At this point, all the recording time data necessary for creating the management area has been extracted, and S
Go to 7.

Since the value of the read counter D added in S6 is the same as the number of blocks from which data is actually taken out, the address of the next recording start block is calculated using this value (S7). Finally, the recording time data in the work C and the address of the next recording start block calculated in S7 are written in the management area of the recording medium (S8), so that the erroneous erasure is restored. The present invention can be used as a recording medium in a recording / reproducing apparatus for various recording media such as optical disks, magneto-optical disks, and magnetic tapes.

[0011]

In the erasing operation of the digital recording apparatus as described above, the recording time data is simply the management data by the method of initializing the data only in the management area. Therefore, the present invention is erased by an erroneous operation. Even in this case, it is possible to restore valuable recorded data without wasting it.

[Brief description of drawings]

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

FIG. 2 is a flowchart illustrating an embodiment of the present invention.

[Explanation of symbols]

 1 DAT drive 2 recording / playback circuit 3 storage device 4 operation switch 5 CPU 6 indicator

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location G11B 27/10 A 8224-5D

Claims (2)

[Claims] 1. A sound recording medium having a sound data area composed of a plurality of unit blocks and a management area for managing data of each block of the sound data area, wherein each block of the sound data area is provided. Has the recording time data and voice data of the block, has the management data formed by the address and the recording time data in the management area, and deletes only the management data in the management area. It is characterized in that the management data which is considered to be erased and erased is restored as management data in the management area by using the recording time data in the voice data area again and the address data is added to the management data. And a digital recording device. 2. The digital recording device according to claim 1, wherein the recording medium is an optical disk.