JPH0363981A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent a system from being hung up by impossibility for detecting a sector mark by stopping the reproducing operation of an address after the lapse of prescribed time when the sector mark is not detected. CONSTITUTION:An undetection detecting circuit 21 is provided to monitor a sector detection signal detecting circuit 18 when an address part is reproduced, and to stop the reproducing operation of the address part when the sector mark is not detected even after the lapse of prescribed time. This undetection detecting circuit 21 is equipped with a timer in the internal part and this timer is started based on an address reproducing indication signal from an address recognizing circuit 6. When the timer is turned to time-over while the sector mark is not detected, such a state is informed of the address recognizing circuit 6 and the reproducing of the address part is indicated to be stopped. Thus, the system can be prevented from being hung up by the impossibility for detecting the sector mark.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an information recording/reproducing device.

[Prior Art] Conventionally, information recording and reproducing apparatuses using information recording media having a structure having a plurality of sectors have been provided.

This information recording/reproducing device manages data on an information recording medium in units of sectors, and each sector is composed of an address section for storing an address and a data section for storing data. Tracking is performed while reading the information, and searches for desired data are performed.

FIG. 3 is a block diagram showing an example of such an information recording/reproducing device.

This information recording and reproducing apparatus exchanges data with an external device (not shown) via an interface control circuit 1, and a CPU 3 controls its entire operation.

Data received from the external device is sent from the buffer 2 to the encoding circuit 4, where it is encoded, and then sent to the recording control circuit 9. In this recording control circuit 9, the address information transferred from the CPU 3 via the address recognition circuit 6 is added to recording data in units of sectors. And modulation circuit 2
After the signal is modulated by 2, the head 27 is driven by the head drive circuit 25, and the signal is recorded on an information recording medium (not shown).

Further, the data read out from the information recording medium by the head 27 is amplified by the preamplifier 26, demodulated by the demodulation circuit 23, and sent to the reproduction control circuit 13.

In this reproduction control circuit 13, address information is extracted based on the sector detection timing notified by the sector detection circuit 24 and the sector detection signal detection circuit 18.
The address recognition circuit 6 is supplied with the address recognition circuit 6. The address recognition circuit determines whether the address specified in advance by the CPU 3 and the reproduced address match. If it is determined that this address information indicates a desired address, the playback data is sent from the playback control circuit 13 to the decoding circuit 5, where it is decoded, and then sent via the buffer 2 and the interface control circuit l. Sent to an external device.

FIG. 4 is a flowchart showing the reproduction operation of the address section in such an apparatus.

First, the CPU 3 instructs the address recognition circuit 6 to reproduce the address, and based on this, the address recognition circuit 6 instructs the reproduction control circuit 13 to reproduce the address part (si).

Therefore, the reproduction control circuit 13 checks whether a detection pulse is output from the sector detection signal detection circuit 18 (32), and upon receiving the detection pulse, regards the input data as data in the address field and decodes it. and sends it to the address recognition circuit 6 (S3).

[Problems to be Solved by the Invention] However, in the above-mentioned conventional technology, when reproducing the address part, the sector mark is not detected by the sector detection circuit 24 for a long time, and the sector detection signal from the sector detection signal detection circuit 18 is output. If this is not done, the loop 32 in FIG. 4 will be repeated endlessly, and there is a risk that the system will hang up.

SUMMARY OF THE INVENTION An object of the present invention is to provide an information recording and reproducing apparatus that can prevent the hang-up caused by the inability to detect sector marks as described above.

[Means for Solving the Problems] The present invention provides an information recording/reproducing apparatus using an information recording medium having a structure having a plurality of sectors, including sector mark detection means for detecting the sector mark of each sector, and sector mark detection means for detecting the sector mark of each sector. The present invention further comprises an address reproducing means for reproducing the address of each sector based on timing, and a control means for stopping the address reproducing operation by the address reproducing means when a sector mark is not detected for a predetermined period of time by the sector mark detecting means. It is characterized by

[Operation] According to the present invention, if a sector mark is not detected during address reproduction, the address reproduction operation is stopped after a predetermined period of time has elapsed, thereby preventing system hang-up due to the inability to detect sector marks. be able to.

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

It should be noted that, among the configurations of this embodiment apparatus, those that are common to the configuration of the conventional apparatus shown in FIG.

This information recording and reproducing device includes a non-detection detection circuit that monitors the sector detection signal detection circuit 18 when reproducing the address section, and stops the reproduction operation of the address section if a sector mark is not detected after a predetermined period of time. 21 are provided. This undetected detection circuit 21 has an internal timer,
This timer is started based on an address reproduction instruction signal from the address recognition circuit 6. If the timer times out without detecting a sector mark, this is notified to the address recognition circuit 6 and an instruction is given to stop reproduction of the address portion.

FIG. 2 is a flowchart showing such an operation of reproducing the address section.

First, the CPU 3 instructs the address recognition circuit 6 to reproduce the address, and based on this, the address recognition circuit 6 instructs the reproduction control circuit 13 to reproduce the address part, and starts the timer of the non-detection detection circuit 21. (S 11
).

Therefore, the reproduction control circuit 13 checks whether a detection pulse is output from the sector detection signal detection circuit 18 (S12), and upon receiving the detection pulse, it regards the input data as data in the address field and stores it. It is decoded and sent to the address recognition circuit 6 (S13), and at the same time, the timer of the non-detection detection circuit 21 is stopped.

Further, if the sector detection signal detection circuit 18 does not output a detection pulse and the timer of the non-detection detection circuit 21 times out (S14), the address recognition circuit 6 sends an instruction to the reproduction control circuit 13 to stop reproduction. is sent, and reproduction of the address section is stopped (Sl5).

In this way, it is possible to prevent the system from hanging up due to the inability to detect sector marks.

[Effects of the Invention] According to the present invention, when a sector mark is not detected during address reproduction, the address reproduction operation is stopped after a predetermined period of time has elapsed, thereby preventing system hang-up due to the inability to detect sector marks. It can be prevented.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an information recording/reproducing apparatus according to an embodiment of the present invention. FIG. 2 is a flowchart showing the reproduction operation of the address section according to the same embodiment. FIG. 3 is a block diagram showing an example of a conventional information recording/reproducing device. FIG. 4 is a flowchart showing the reproducing operation of the address section in the conventional information recording/reproducing apparatus. 3... CPU, 6... Address recognition circuit, 9... Recording control circuit, 13... Playback control circuit, 18... Sector detection signal detection circuit, 21... Undetected detection circuit, 24 ... sector detection circuit, 25 ... head drive circuit, 27 ... head.

Claims (1)

[Claims] In an information recording and reproducing apparatus using an information recording medium having a structure having a plurality of sectors, sector mark detection means for detecting sector marks of each sector; An address reproducing means for reproducing the address of a sector; and a control means for inhibiting an address reproducing operation by the address reproducing means when a sector mark is not detected by the sector mark detecting means for a predetermined period of time. Information recording and reproducing device.