JPH10188444A - Audio reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the reproduction even in a defect exists, end to avoid the generation of sound jumping, by performing the control, when there is any defect sector unable to read out at the time of audio reproduction from a recording medium, so as to continue the reproduction from the next sector jumping over the defect sector. SOLUTION: In this audio reproducing device using an optical disk, audio data are read out (S4) from the optical disk and the judgement is made (5) for every sector whether the read-out is normal or not. When the result is YES, the audio reproduction is continued (S6) and returned to a main loop. When the judgement result is NO, the number of continued defects is counted (S7) from the defect sector for the judgement (S8). When the number of the continuation is less than 4, the reproduction is continued from the next sector jumping over these defect sectors, and the retry is carried out when it is more than 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an audio reproducing apparatus for reproducing audio data recorded on a recording medium such as an optical disk.

[0002]

2. Description of the Related Art A recording medium called an optical disk is used in an optical disk device which is one of the representative audio reproducing devices. This optical disk has a track divided into a number of sectors, and audio data is recorded for each sector together with its position data. The reproduction of the audio data from the optical disk in the optical disk device is performed by reading the audio data and the position data from the optical disk rotating at a predetermined number of revolutions by an optical pickup under the control of the reading control means.

[0003] In an optical disk, for example, there is a case where reading is difficult or a sector which cannot be read, that is, a defective sector is generated due to, for example, the attachment of a scratch or dust. When there is such a defective sector, the conventional optical disk device retries the defective sector. In the retry,
The pickup is once returned to a track inside the track where the defective sector exists by a track jump, reading is resumed from there, and the defective sector is read again. Such a retry operation requires a time obtained by adding a time required for a track jump and a time required for reading a plurality of sectors from a track jump position to a defective sector.
For example, if there are nine sectors from the track jump position to the defect sector, it takes nine times or more the reading time of one sector (normally 13.3 msec). During this time, the reading of the audio data is stopped, and the sound is skipped. On the other hand, such a retry is repeated about five times, and if reading is still not possible, a reproduction error occurs, and reproduction of the optical disk is stopped there.

As can be seen from the above description, in the case of the conventional optical disk apparatus, if there is a defective sector on the optical disk, skipping occurs during reproduction or audio reproduction cannot be performed beyond the defective sector. turn into.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and it is possible to reproduce audio even if there is a defect in a recording medium, and to avoid occurrence of sound skipping. The purpose is to provide an audio playback device.

[0006]

For this purpose, the present invention makes use of the general auditory characteristics of humans. That is, according to the study of the present inventor, the reading time 1
In the case of a sector having a length of 3.3 msec, if at least four sectors are not read, the sound is not perceived as skipping even if it is not read. In other words, if the connection of the defective sectors is less than the range where sound skipping is not perceived by the auditory sense, no skipping occurs without reading these defective sectors. Therefore, if the number of defective sectors is less than a certain number, skip retry for reading these defective sectors. In other words, by ignoring these defective sectors, skipping can be prevented. Also, reproduction errors due to these defective sectors can be avoided.

More specifically, an audio reproducing apparatus which reads audio data and position data from a recording medium on which audio data is recorded together with position data for each of a large number of sectors set by dividing a track. In the case of (1), when there is a defective sector that cannot be read during audio reproduction from the recording medium, read control is performed to jump over the defective sector and continue reproduction from the next sector.

[0008]

Embodiments of the present invention will be described below with reference to an optical disk device. In the optical disk device according to the present embodiment, read control including a sub-loop shown in the flowchart of FIG. 1 is performed.

Audio reproduction is started at step S1 of the sub-loop. In step S2, the current position of each sector continuously read after the start of audio reproduction is confirmed based on the position data of the sector. Here, the position data is defined by M minutes, S seconds, and F frames using time, and is also called MSF. In step S3, the state of the servo system for causing the pickup to perform positioning and focusing for reading is confirmed. That is, it is checked whether or not there is an abnormality in the servo system that makes data reading impossible regardless of the presence or absence of a defect. Following this, the audio data is read (step S
4) In step S5, whether or not the reading is normal is determined for each sector. If YES, audio reproduction is continued (step S6), and the process returns to the main loop.

If the result of step S5 is NO, the sector is a defective sector,
In general, since a defect often covers a plurality of sectors, the number of continuous defects is counted from the defect sector (step S7), and the result is determined (step S8). In this example, the standard of the number of continuous defect sectors is four. That is, if the number of consecutive defective sectors is 4 or less, the reproduction is continued from the next sector by skipping over these defective sectors, and if it is 5 or more, retry is performed. If the result in step S8 is YES,
For each of the four or less defective sectors that jump over, the respective position data are complemented by analogy with the position data of the sector preceding the defective sector. That is, since the position data has not been read for these defective sectors, the corresponding data is complemented (step S9). Next, a sector is updated by adding one sector to the complemented position data (step S1).
0), and return to step S2. On the other hand, if the result in step S8 is NO, a retry is performed as in the conventional case (step S11).

[0011]

As described above, according to the present invention, skips due to defects can be effectively eliminated, better audio reproduction can be performed, and reproduction errors due to defects can be reduced. Generation can also be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a flowchart of a sub-loop included in reading control in an optical disc device according to an embodiment.

Claims (1)

[Claims] 1. An audio reproducing apparatus which reads audio data and position data from a recording medium on which audio data is recorded together with position data for each of a large number of sectors set by dividing a track. An audio reproducing apparatus characterized in that, when there is a defective sector which cannot be read at the time of reproducing audio from a medium, read control for skipping over the defective sector and continuing reproduction from the next sector is performed.