JPH01182974A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To detect the extent of the deterioration of an information recording medium or a service life by comparing-operating an error correction quantity by an error correction circuit at the time of an information reading and the reference value of the error correction quantity set beforehand. CONSTITUTION:An error correction quantity comparison circuit 9 compares the data of the error correction quantity sent from an error correction circuit 6 through a signal line 8 and the reference value of the error correction quantity on a signal line 10 set beforehand. When the error quantity of a reproducing signal exceeds the reference value of the error correction quantity, sends out a flag to an emergency signal generation circuit 12 through a signal line 11. After receiving the flag, the emergency signal generation circuit 12 generates an emergency signal and sends out the emergency signal to a succeeding processing system. The flag can be generated when the error correction quantity set beforehand is exceeded. Thus, the error correction quantity can be easily assumed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an information recording and reproducing apparatus, and particularly to an information recording and reproducing apparatus for a disk-shaped information recording medium such as an optical disk.

(Prior Art) Conventionally, this type of information recording/reproducing apparatus records/reproduces information optically or magneto-optically on a disc-shaped information recording medium, but the information recording medium is sensitive to surface roughness of the medium surface, The shape of the defect, the size of the defect, the reflectance, etc. change over time. These changes over time affect the information recording/reproducing characteristics, and the condition of the medium surface becomes unsuitable as an information recording medium for information recording/reproducing devices in terms of error rate, such as an increase in the number of missing bits in recorded data. It is possible that it may change.

Conventional information recording and reproducing devices do not have a means to monitor the state of deterioration of the recording film of the information recording medium described above, so the number of errors exceeds the error correction capability of the information recording and reproducing device. However, the degree of deterioration of the information recording medium could not be determined until it became impossible to read the written information.

(Problems to be Solved by the Invention) As described above, the conventional information recording and reproducing apparatus that records and reproduces information on a disk-shaped information recording medium monitors the condition of the recording film of the information recording medium in terms of error rate. Because there was no means in place, there was no way to easily detect or determine whether or not an information recording medium would pose a problem in actual use.

An object of the present invention is to compare a preset error correction amount reference value with the error correction amount of a reproduced signal subjected to error correction processing, and to determine whether the error correction amount of the reproduced signal exceeds the preset nine-niller correction amount. When all flags are detected, the above drawback is removed by generating an emergency signal for the subsequent processing system, and error correction is easily performed. An object of the present invention is to provide an information recording/reproducing device configured to perform the following functions.

(Means for Solving the Problems) An information recording/reproducing apparatus according to the present invention is constructed to include a recording/reproducing means, an error correction amount comparison circuit, and an emergency signal generation circuit.

The recording/reproducing means is for recording/reproducing information on a disk-shaped recording medium such as an optical disk and for error correction.

The error correction amount comparison circuit compares the error correction amount of the reproduced signal subjected to error correction processing by the recording/reproducing means with a preset reference value of the error correction amount, and the error correction amount of the reproduced signal is determined as the error correction amount. reference (this is to generate a flag when exceeding ink).

The emergency signal generation circuit detects all the flags sent from the error correction amount comparison circuit and generates all the emergency signals for the subsequent processing system.

(Example) Next, one aspect of the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an information recording/reproducing apparatus according to the present invention.

In Fig. 1, 1 is an information recording medium, 2 is an optical pickup, 3 is an original beam, 4 is a signal line for carrying read data, 5 is a signal reproducing circuit, and 6 is an error correction circuit (ECC).
), 7 is a signal line for outputting read data, 9 is an error correction amount comparison circuit, 10 is a signal line for inputting an error correction amount reference value, and 12 is an emergency signal generation circuit.

Information written on the information recording medium 1 is read out by the optical pickup 2 and sent to the signal reproducing circuit 5. The read signal reproduced by the signal reproducing circuit 5 is sent to an error correction circuit (
After executing error correction processing, the data is sent to a subsequent data processing circuit (not shown) via a signal line 7 as read data. On the other hand, when the error correction circuit (ECC) 6 performs error correction on the reproduced signal, it also detects the amount of error correction at the same time, and data on the amount of error correction is sent to the error correction amount comparison circuit 9 via the signal line 8.

Here, the error correction amount comparison circuit 9 compares the error correction amount data sent from the error correction circuit 6 via the signal line 8 with a preset error correction amount reference value on the signal line 10. do.

When the number of errors in the reproduced signal exceeds the reference value of the error correction amount, all flags are sent to the emergency signal generation circuit 12 via the signal line 11.

When the flag money is received, the emergency signal generating circuit 12 generates an emergency signal 7, and sends an emergency signal ? to the subsequent processing system. Send.

Here, error correction and occurrence of emergence during information recording and reproduction will be explained.

For example, assume that the error correction limit when recording information is set to 2 bytes in total, and when information is recorded in the corresponding sector, the error correction circuit 6 corrects errors of 2 bytes or more. In this case, the sector is treated as a bad sector, and the same data recorded in the bad sector is recorded in the alternative sector. In this case as well, the above-described error correction process is performed, and immediately after data recording, there is no sector in which the amount of error correction is 2 bytes or more.

However, as the reflectance and defects of information recording media change over time, the amount of errors in recorded data also increases over time, exceeding the limits of error correction ability and making recorded information unreadable. It is possible that

Here, 1. For example, when the limit of the error correction ability of the error correction circuit 6 is 8 bytes, what is the reference value of the amount of error correction? If it is set to 7 bytes, if the error correction circuit 6 performs error correction processing for 7 bytes or more when reading information, the emergency signal generation circuit 12 generates all the emergency signals. Therefore, before the information recorded on the information recording medium becomes unreadable, what countermeasures should be taken, such as recognizing that the time when the information becomes unreadable is approaching and rewriting the information to another information recording medium? can be taken.

(Effects of the Invention) As explained above, the present invention provides an information recording and reproducing apparatus that records/reproduces information on a disk-shaped information recording medium, and the amount of error correction by an error correction circuit when information is continuously outputted, and the amount of error correction set in advance. By comparing and calculating the error correction amount with the reference value.

To automatically and easily detect the degree of deterioration or lifespan of an information recording medium. Furthermore, it is possible to easily know that the time when the information recorded on the information recording medium becomes unreadable due to deterioration of the information recording medium is near. be.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an information recording/reproducing apparatus according to the present invention. 1... Information recording medium 2... Optical pickup 3... Original beam 5.
...Signal regeneration circuit 6...Error correction circuit 9...
Error correction amount comparison circuit 12...Emergency signal generation circuit 4.7, 8.1
0.11...Signal line patent applicant NEC Corporation

Claims (1)

[Claims] Recording/reproducing information on disk-shaped recording media such as optical disks,
recording/reproducing means for error correction;
The amount of error correction of the reproduced signal subjected to error correction processing by the reproduction means is compared with a reference value of the amount of error correction set in advance, and when the amount of error correction of the reproduced signal exceeds the reference value of the amount of error correction, An error correction amount comparison circuit for generating a flag, and an emergence signal generation circuit for detecting the flag sent from the error correction amount comparison circuit and generating an emergence signal for a subsequent processing system. An information recording and reproducing device characterized in that it is configured as follows.