JP3263793B2 - Optical disc playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Table of Contents] The present invention will be described in the following order. Industrial application Conventional technology (FIG. 10) Problems to be solved by the invention (FIG. 10) Means for solving the problems (FIGS. 1, 5 and 7) Operation (FIGS. 1, 5 and 7) Embodiments (1) First Embodiment (FIGS. 1 to 5) (1-1) Overall Configuration (1-2) Data Processing During Reproduction (1-3) System Control Circuit (1-4) Embodiment (2) Second embodiment (FIGS. 6 to 9) (3) Other embodiments Effects of the invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc reproducing apparatus, and is suitably applied to, for example, a magneto-optical disc apparatus which outputs reproduced data via a memory circuit.

[0003]

2. Description of the Related Art Conventionally, in a magneto-optical disk device,
There has been proposed a device in which reproduced audio data is output through a large-capacity memory circuit so that skipping of sound can be effectively avoided.

That is, in this type of magneto-optical disc apparatus, audio data is recorded in a predetermined block unit (hereinafter referred to as a sector), and at the time of reproduction, the audio data is reproduced in this sector unit. When reproducing the audio data, the magneto-optical disc device sequentially stores the audio data in a memory circuit, and determines whether or not the audio data has been correctly reproduced. Retry read in sector units.

Thus, for a sector in which audio data cannot be reproduced correctly due to, for example, vibrations, the magneto-optical disk device repeats read retries within a predetermined set number of times, and uses the read-retried audio data for audio memory of the memory circuit. Update data.
As a result, in the magneto-optical disk device, by repeating read retries within a predetermined set number of times, audio data that has been correctly reproduced can be selectively accumulated in the memory circuit.

On the other hand, if the audio data cannot be correctly reproduced even if the read retry is repeated within the set number of times, the reproduction of the audio data is stopped for this sector, and the audio data is reproduced for the subsequent sector.

Thus, in a magneto-optical disk device, audio data that has been correctly reproduced in sector units is sequentially stored in a memory circuit, and this memory circuit is used as a ring buffer to output audio data. That is, in the magneto-optical disk device, the audio data thus reproduced is stored in a memory circuit, and the stored audio data is sequentially transmitted to the outside at a predetermined transmission speed.

At this time, in this type of magneto-optical disk device, audio data is reproduced at a transmission speed higher than the transmission speed of audio data to be transmitted to the outside, and the reproduced audio data is stored in a memory circuit.

As a result, as shown in FIG. 10, in the magneto-optical disk device, this memory circuit is used as a ring buffer, and the audio data is read out so as to follow the operation of storing the audio data (represented by the symbol W). Even if the optical pickup tracks due to vibration or the like, the audio signal can be reproduced without skipping.

[0010]

By the way, in this type of magneto-optical disk device, if read retries are repeated frequently, the audio data read operation R can catch up with the audio data storage operation W, and eventually the audio data is lost. It cannot be sent outside. In particular, when the optical pickup has a track jump due to vibration or the like, it takes time to return to the original track.
The remaining amount of audio data stored in the memory circuit decreases accordingly.

As described above, when the read operation R catches up with the storage operation W, the audio signal to be transmitted to the outside is cut off in the middle of the audio signal, and becomes extremely hard to hear as in the case where the sound skips due to vibration or the like. There is.

As one method of reducing this sound interruption,
A method of reducing the set number of read retries and thereby reducing the number of read retries can be considered.
However, even if the audio data cannot be reproduced correctly, if it is caused by disturbances such as vibrations, the audio data can be reproduced correctly if read retries are repeated many times. Frequently, audio data cannot be reproduced correctly, which may result in frequent noises.

The present invention has been made in view of the above points, and it is an object of the present invention to propose an optical disc reproducing apparatus capable of preventing sound interruption and reducing occurrence of abnormal noise.

[0014]

According to the present invention, there is provided an optical disk reproducing apparatus 1 for reproducing, from an optical disk 2, recording data DATA recorded in a predetermined block unit with a header added thereto. Reproducing means 3 and 6 for sequentially reproducing the recording data DATA from the optical disc 2 in units; and performing predetermined error correction processing on the recording data DATA reproduced from the optical disc 2 by the reproducing means 3 and 6 to obtain an error. An error correction processing means 15 for outputting a correction processing result C2PO; and a sector determination means 7 for determining whether or not the recording data DATA reproduced from the optical disc 2 by the reproduction means 3 and 6 has been correctly reproduced. And memory means 1 for temporarily storing error-corrected recording data DATA output from error correction processing means C2PO. When, an evaluation unit 7 for evaluating the recording data DATA captured in the memory means 14 based on the discrimination result of the error correction processing result C2PO and sector discrimination means 7 output from the error correction processing means 15, evaluating means 7
Setting means 7 for setting the number of re-executions of the reproduction of the recording data DATA recorded on the optical disk 2 based on the evaluation result of (1), and based on the accumulation amount accumulated in the memory means 14 and the number of re-executions. A changing means for changing an evaluation standard in the evaluation means is provided.

[0015]

[0016]

By changing the evaluation criterion in the evaluation means based on the storage amount stored in the memory means and the number of re-executions, it is possible to prevent sound interruption and to reduce the occurrence of abnormal sounds. can do.

[0017]

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

(1) First Embodiment (1-1) Overall Configuration In FIG. 1, 1 indicates an optical disk device as a whole,
The spindle motor M1 is driven to rotate the magneto-optical disk 2 at a predetermined rotation speed.

In this state, the optical disk device 1 intermittently irradiates a light beam from the optical pickup 3 through the objective lens 5 and applies a predetermined modulating magnetic field through the magnetic head 4, whereby the modulation is performed. The desired recording data determined by the magnetic field is recorded on the magneto-optical disk 2 by thermomagnetic recording. The magneto-optical disc 2 is housed in a predetermined cartridge 2A and protected, and when the magneto-optical disc 2 is loaded into the magneto-optical disc apparatus 1, the shutter opens and is exposed from a predetermined window.

At this time, in the optical disk device 1, the reflected light beam is received by the optical pickup 3, and the light reception result is output to the servo control circuit 6 via the amplifier circuit 5. The servo control circuit 6 drives the feed motor M2 and drives the optical pickup 3 based on the result of the light reception, thereby performing the tracking control and the focus control of the optical pickup 3, and moving the optical pickup 3 to a predetermined recording track. Thus, audio data can be recorded and reproduced for a desired area.

On the other hand, at the time of reproduction, the optical disk device 1 reduces the light amount of the light beam emitted from the optical pickup 3 and detects the reflected light beam of the light beam with the optical pickup 3. Thus, the optical disk device 1 can reproduce the recorded information based on the output signal of the optical pickup 3.

Here, the optical disk device 1 executes this recording / reproducing process under the control of the system control circuit 7. That is, the system control circuit 7 switches the entire operation by outputting control data in response to the operation of the operation element 8, and displays the operation mode and the like on the display device 9 as necessary at this time.

Further, at the time of recording and reproduction, the system control circuit 7 detects the position information recorded in the recording track in the pre-groove format based on the output signal of the optical pickup 3 by the address decoder 18 to confirm the recording and reproduction position. When an error such as a track jump occurs, the entire operation is controlled so as to compensate for the recording / reproducing data damaged by the error.

The recording system of the optical disk device 1 controlled by the system control circuit 7 converts an audio signal A _IN through an input terminal 10 into an analog digital conversion circuit (A / D).
11 are input, and here, 16-bit audio data is converted into a continuous digital audio signal.

The audio compression / expansion circuit 12 performs a signal compression process on a digital audio signal output from the analog digital conversion circuit 11 in accordance with a predetermined format, and stores the compressed audio data in the memory controller 13.
Is input to the memory circuit 14 via the.

The memory circuit 14 has an audio signal A
_The optical disk device 1 is capable of storing about 3 seconds of audio data in terms of _IN.
By recording the audio data via 4, even if an error such as a track jump occurs, the recording operation can be restarted without interrupting the input of the audio signal A _IN .

The encoder / decoder 15 performs a coding process for error correction, an EFM coding process, and the like on the audio data output from the memory circuit 14 via the memory controller 13 to generate a predetermined recording signal. Then, the recording signal is output to the head drive circuit 16.
The head drive circuit 16 drives the magnetic head 4 based on the recording signal, thereby forming a modulation magnetic field according to the recording data.

On the other hand, the reproducing system supplies the reproduced signal of the optical pickup 3 to the encoder / decoder 15 via the amplifier circuit 14, where the reproduced signal is demodulated into binary data and error correction processing is performed. I do.

The memory circuit 14 has an encoder /
With respect to the output data of the decoder 15, the audio data that has been correctly reproduced is selectively accumulated and output, so that the optical disk device 1 can reproduce the audio data even when an error such as a track jump occurs as in the recording. The reproduction operation can be resumed without interrupting the output of the signal A _OUT .

The time compression / expansion circuit 12 performs signal expansion processing on audio data output from the memory circuit 14 during reproduction, and thereby reproduces a digital audio signal subjected to signal compression processing during recording.

Digital analog conversion circuit (D / A) 2
0 is obtained by converting a digital audio signal output from the time compression / expansion circuit 12 into an analog signal.
The audio signal A _OUT is generated, and the audio signal A
_OUT is output from the output terminal 28.

(1-2) Data Processing During Reproduction As shown in FIGS. 2 and 3, in this embodiment, the magneto-optical disk device 1 processes audio data in sector units. Error correction processing is performed by the encoder / decoder 15.

That is, in the audio data, after being divided into predetermined block units, sync data SY, a header HD formed of time information and the like, and a sub-header SH are added and recorded at the head of each block. In this way (FIG. 3A), recording is performed in sector units.

Further, at the time of this recording, an error correction code consisting of C1 and C2 codes is added to the audio data in sector units, so that an error can be corrected based on the error correction code during reproduction. I have.

Thus, the encoder / decoder 15
An error correction process is performed based on the error correction code, and if the error cannot be corrected using the C2 code at this time, the logic level of the identification data C2PO (FIG. 3B) representing the error correction result is raised.

As shown in FIG. 4, the encoder / decoder 1
5 is the reproduced audio data DATA (FIG. 4)
(B)), the identification data C2PO (FIG. 4 (C)) is output to the memory controller 13 together with the bit clock BCK and the reference signal LRCK (FIG. 4 (A)) synchronized with the audio data. When the data C2PO rises, the system control circuit 7
Outputs an interrupt signal INT (FIG. 3C).

When the error cannot be corrected even by using the C2 code, the encoder / decoder 15 synchronizes the identification data C2PO (FIG. 3) with the data that cannot be corrected.
While the logic level of (B) is raised, the memory controller 13 outputs an interrupt signal INT during a period during which audio data of the subsequent sector is input.

In response to the interrupt signal INT, the system control circuit 7 executes a predetermined processing procedure, thereby driving the servo circuit 6 and the like as necessary to determine the sector where the identification data C2PO has risen. Read retry is performed as necessary.

(1-3) System Control Circuit In the system control circuit 7, the processing procedure shown in FIG. 5 is executed, so that a read retry is performed if necessary, whereby a sound interruption can be prevented. This prevents the audio signal from being reliably reproduced.

That is, in the system control circuit 7,
The process proceeds from step SP1 to step SP2, where the target address data is fetched for the target sector, and then the process proceeds to step SP3. Here, the system control circuit 7 judges whether or not the identification data C2PO has risen on the basis of the interrupt signal INT, thereby judging whether or not there is an error in the audio data for the target sector. If the audio data has been correctly reproduced, a negative result is obtained, and the process proceeds to step SP4.

Here, the system control circuit 7 judges whether or not it is the last recording position of the magneto-optical disc 2, and if it is the last recording position, a positive result is obtained in step SP4, so that the process proceeds to step SP5. Complete. On the other hand, if there is still a cluster to be reproduced, the process proceeds to step SP6 to add the address data by the H level to switch to the sector following the target sector, and then proceed to step SP7.

Here, the system control circuit 7 resets the retry flag, and then returns to step SP2. As a result, in the system control circuit 7, when the audio data is correctly reproduced, the steps SP2-SP3-SP4-SP6-SP7-S are performed in sector units.
The processing loop LOOP1 of P2 is repeated so that audio data can be reproduced for successive sectors.

On the other hand, when the interrupt signal INT falls (that is, when the identification data C2PO rises), it can be determined that the reproduced audio data is incorrect in this case. In the above, a positive result is obtained, and the routine proceeds to step SP8. Here, the system control circuit 7 determines whether or not the retry flag is set.
If the audio data has been reproduced without error until then, a negative result is obtained, and the process proceeds to step SP9, where the retry flag is set, and the data of the audio data stored in the memory circuit 14 in the subsequent step SP10. Detect the amount.

This data amount is stored in the memory controller 13.
Can be detected by obtaining a subtraction result between the write address data and the read address data generated in step (1). When the amount of data is detected, the system control circuit 7 subsequently proceeds to step SP11. It is determined whether or not the detected data amount is equal to or more than の of the capacity of the memory circuit 14.

If a positive result is obtained, the memory circuit 14 has sufficient audio data to be output to the audio compression / expansion circuit 12 so that no sound interruption occurs even if read retry is repeated. This allows the system control circuit 7 to proceed to step SP12, set the retry counter to a value of 3, and then return to step SP2. As a result, in the magneto-optical disk device 1, since the target address is held at the original value, the identification data C2P
A read retry is executed for the sector in which O has risen.

At the time of this read retry, if the audio data can be correctly reproduced, the system control circuit 7 executes the processing procedure of steps SP2-SP3, so that a negative result is obtained in step SP3. SP4, step SP6, step S
The processing procedure of P7 is executed. Thus, in the magneto-optical disk device 1, the audio data in the memory circuit 14 is updated with the correctly reproduced audio data, and the audio data is reproduced for the subsequent sector.

On the other hand, if the audio data cannot be correctly reproduced even after the read retry, step SP3
When a positive result is obtained in step (1), the process proceeds to step SP8 in the system control circuit 7, where the retry flag is set in advance, so that the process proceeds to step SP13. Here, the system control circuit 7 decrements the count value by decrementing the retry counter by the H level due to the read retry once, and then determines whether or not the value of the retry counter is the L level in the next step SP14. .

Here, in the case of the first read retry, since the count value is held at the value 2, a negative result is obtained in the system control circuit 7, and the process returns to step SP2. Thus, in the system control circuit 7, when the audio data is sufficiently stored in the memory circuit 14, the steps SP2-SP3-SP8-
The processing procedure of SP13-SP14-SP2 is repeated until the value of the retry counter becomes L level, so that the magneto-optical disk device 1 performs read retry within a maximum of three times.

At the time of this read retry, if the audio data can be correctly reproduced, a positive result is obtained in step SP3, so that the system control circuit 7 shifts from step SP3 to step SP4, whereby the magneto-optical disc is reproduced. In the device 1, the audio data in the memory circuit 14 is updated with the audio data that has been correctly reproduced, and the audio data is reproduced for the subsequent sector.

On the other hand, if the correct audio data cannot be reproduced even after the read retry is repeated three times, the system control circuit 7 proceeds to step SP15 because a positive result is obtained in step SP14. Here, in the system control circuit 7, after resetting the retry flag, the process proceeds to step SP16, the target address is set to the address of the succeeding sector, and the process returns to step SP2.

Thus, in the magneto-optical disk device 1, when the audio data is sufficiently stored in the memory circuit 14, the read retry is repeated three times.
If the audio data cannot be correctly reproduced even after repeating three times, the audio data stored in the memory circuit 14 is left as it is, and the audio data is reproduced for the subsequent sector.

Thus, in the magneto-optical disc apparatus 1, when the audio data cannot be reproduced correctly even if the read retry is repeated many times, the audio data which cannot be reproduced correctly can be directly compressed. The data is output to the decompression circuit 12, so that useless read retry processing is reduced.

On the other hand, when the read retry is frequently repeated and the amount of data stored in the memory circuit 14 is equal to or less than 1/2 of the capacity of the memory circuit 14, a negative result is obtained in step SP11, and the system control circuit 7 proceeds to step SP17. In other words, when the read retry is frequently repeated and the amount of data stored in the memory circuit 14 is small, in the magneto-optical disk device 1, when the read retry is repeated, the read operation of the memory circuit 14 catches up with the write operation, and a sound interruption occurs. There is fear.

Thus, in the system control circuit 7, in step SP17, the value of the retry counter is set to the H level, and the flow returns to step SP2. As a result, in the magneto-optical disk device 1, since the target address is held at the original value, the identification data C
The read retry is executed for the sector at which 2PO has risen. At this time, since the retry counter is set to the H level, the read retry is executed only once and the subsequent sector is reproduced.

Thus, in the magneto-optical disk device 1, by switching the number of read retries when the amount of data in the memory circuit 14 is small, the occurrence of sound interruption due to the read operation of the memory circuit 14 catching up with the write operation is anticipated. When a sufficient data amount is secured, read retry is repeated to reproduce correct audio data.

(1-4) Effects of the Embodiment According to the above configuration, by switching the number of read retries in accordance with the amount of data in the memory circuit, even if read retries are frequently repeated, the occurrence of sound interruption can be prevented. When the data amount is sufficient, correct audio data can be reproduced to reduce occurrence of abnormal noise.

(2) Second Embodiment In this embodiment, the system control circuit 7 switches the number of read retries according to the amount of data in the memory circuit 14 and evaluates whether audio data has been correctly reproduced. The reference is switched, thereby preventing sound interruption and reducing the occurrence of abnormal noise.

Here, in this embodiment, the encoder /
In the decoder 15, when the data that cannot be corrected even by using the C2 code is the sync data SY (FIG. 3),
The head flag HF (FIG. 2) is started,
Thus, the system control circuit 7 can detect the position where the error has occurred.

Further, the encoder / decoder 15 detects time information of the sync data SY, and obtains a comparison result with respect to successive sectors, thereby detecting an error in the time information. As a result, when the time information is erroneously detected, the current header CH (FIG. 2) output to the system control circuit 7 is started, and the time information is interpolated based on the time information obtained from the immediately preceding sector. It has been made like that.

Thus, the magneto-optical disc device 1 can detect a state where only the header is erroneously reproduced, and if only the time information is erroneously reproduced, the interpolated time information is used as a reference. To output audio data. In the case of this embodiment, an evaluation standard is set based on the identification data C2PO, the header flag HF and the current header CH, and the evaluation standard is switched according to the data amount of the memory circuit 14.

That is, in this embodiment, the system control circuit 7 proceeds from step SP20 to step SP21, where the target address data is fetched for the target sector, and then proceeds to step SP22. Here, for the target sector, identification data C
2PO, the header flag HF and the current header C
After setting an evaluation status indicating a final evaluation result as to whether or not the audio data has been correctly reproduced based on H, it is determined in a succeeding step SP23 whether or not the evaluation status is OK.

If the evaluation status is OK, the system control circuit 7 obtains an affirmative result and proceeds to step SP24, where it clears the retry counter and then proceeds to step SP25. Here, the system control circuit 7 judges whether or not the current position is the last recording position of the magneto-optical disc 2. If the last recording position is reached, an affirmative result is obtained in step SP25, and the process proceeds to step SP26 to complete the processing procedure. .

On the other hand, if the cluster to be reproduced still remains, the system control circuit 7 switches to the target sector and the succeeding sector by adding the address data by the H level to step SP27. Thereafter, the process returns to step SP21. Thereby, in the system control circuit 7, when the evaluation status is set to OK, the steps SP21-SP22-
The processing loop LOOP2 of SP23-SP24-SP25-SP27-SP21 is repeated so that audio data can be reproduced for successive sectors.

On the other hand, if the evaluation status is set to NG, the system control circuit 7 proceeds to step SP28 because a negative result is obtained in step SP23. Here, in the system control circuit 7, after incrementing the retry counter, the process subsequently proceeds to step SP29, where the control data SC is output to the servo circuit 6 and the like to perform a read retry, and the address data of the memory circuit 14 is read out. Then, the audio data taken into the memory circuit 14 is replaced, and the audio data evaluated as having not been correctly reproduced is replaced with the audio data to be subsequently retried.

As a result, the system control circuit 7 returns to step SP21 to set the evaluation status again for the audio data read-retried, and switches the evaluation status setting reference by the data amount of the memory circuit 14, thereby converting the audio data. An evaluation criterion for determining whether or not the data has been correctly reproduced is switched according to the data amount of the memory circuit 14, thereby preventing sound interruption and reducing occurrence of abnormal noise.

Here, the system control circuit 7 sets the evaluation status by executing the processing procedure shown in FIG. That is, the system control circuit 7 proceeds from step SP30 to step SP31, where the data amount of the audio data stored in the memory circuit 14 is detected, and it is determined whether or not this data amount is equal to or larger than a predetermined value.

If a negative result is obtained, in this case, if the read retry is repeated many times, the read operation of the memory circuit 14 may catch up with the write operation.
Then, the retry counter determines whether or not it is at the L level.
If a negative result is obtained here, it can be determined that a read retry has been performed for this sector with a small amount of data, so that the system control circuit 7 proceeds to step SP33 and sets the evaluation status to OK. The process proceeds to step SP34 to complete this evaluation processing.

As a result, the system control circuit 7 evaluates that the read-retryed audio data is correct for the sector read-retried in a state where the data amount is small, and the contents of the memory circuit 14 are read using the read-retried audio data. Update. Thus, in the magneto-optical disc device 1, the updated audio data is output, so that sound loss can be prevented beforehand.

On the other hand, when the retry counter is at the L level in a state where the data amount is small, in this case, the sector is reproduced for the first time, so that the system control circuit 7 obtains an affirmative result in step SP32. Then, the process proceeds to the subroutine RT. In this subroutine RT, the system control circuit 7 sends the identification data C
The audio data is evaluated based on 2PO, the header flag HF, and the current header CH, and the evaluation result is output.

Here, in the system control circuit 7, complete evaluation for evaluating that the entire sector could be reproduced without any error, evaluation of OK for evaluating that the audio data could be correctly reproduced, and reproduction of the audio data correctly were performed. One of the following evaluation results is obtained: an evaluation of NG that is evaluated as being unacceptable, and an unknown evaluation that cannot be determined whether audio data has been correctly reproduced.
After executing the subroutine RT, the system control circuit 7 proceeds to step SP35, in which it is determined whether or not an NG evaluation result is obtained. If a negative result is obtained, the process proceeds to step SP33.

Thus, in the system control circuit 7, in the case of a sector to be reproduced for the first time with a small amount of data, the reproduced audio data cannot be evaluated unless it is judged that the audio data is not correctly reproduced. The evaluation status is set to OK, thereby reducing the frequency of read retries and reproducing the audio data for the following sector.

On the other hand, if a positive result is obtained in step SP35, the system control circuit 7 proceeds to step SP36, where the evaluation status is set to NG and the process proceeds to step SP34. As a result, in the system control circuit 7, in the case of a sector to be reproduced for the first time with a small amount of data, the evaluation status is set to NG and the read status is set to NG for the audio data evaluated as NG which is evaluated as not being correctly reproduced. It is made to retry.

When this read retry is executed in a state where the amount of data is small, the system control circuit 7 obtains a negative result in the subsequent evaluation step SP32 of the read audio data in the system control circuit 7, so that the read retry is performed. Audio data is processed as correct audio data,
Accordingly, when the data amount of the memory circuit 14 is small, 1
One-time read retries are performed.

On the other hand, if the data amount is large, the system control circuit 7 proceeds to step SP37 when a positive result is obtained in step SP31. Here, the system control circuit 7 determines whether or not the value of the retry counter is at the L level, and if a negative result is obtained here, it is determined at step SP38 whether or not the value of the retry counter is at the H level. Here, since a negative result is obtained in the two read retry processes, the system control circuit 7 directly proceeds to step SP33, and sets the evaluation status to OK.

As a result, in the system control circuit 7, when the data amount of the memory circuit 14 is sufficient, the read retry is repeated twice so that the OK evaluation status cannot be obtained even if the read retry is performed once. In this case, the evaluation status is set to OK for the audio data that has been retried the second time, and this audio data is output.

On the other hand, in the case of the first read retry in a state where the data amount is sufficient, the system control circuit 7 executes the subroutine RT after obtaining the affirmative result in step SP38, and then executing step S38.
Move to P39. Here, in the system control circuit 7,
It is determined whether or not a complete evaluation result has been obtained. If an affirmative result has been obtained, the process proceeds to step SP33, whereas if a negative result has been obtained, the process proceeds to step SP40, and it is determined whether or not the result is an NG evaluation result.

If a negative result is obtained, the process proceeds to step SP33 in the system control circuit 7, whereas if a positive result is obtained, the process proceeds to step SP36. As a result, in the system control circuit 7, in the case of the first read retry with a sufficient data amount, the evaluation status is set to OK unless an NG evaluation result is obtained. Is output.

On the other hand, if an NG evaluation result is obtained in the first read retry while the data amount is sufficient, the system control circuit 7 performs a read retry again, and When a negative result is obtained in step SP38, the audio data subjected to the second read retry is stored in the memory circuit 14.

On the other hand, in the case of a sector to be reproduced for the first time when the data amount is sufficient, a positive result is obtained in step SP37, so that the system control circuit 7 executes the subroutine RT and then executes step SP41.
Move on to Here, the system control circuit 7 determines whether or not a complete evaluation result has been obtained, and proceeds to step SP33 when an affirmative result has been obtained, whereas it proceeds to step SP36 when a negative result has been obtained.

As a result, the system control circuit 7 sets the evaluation status to NG in the case of a sector to be reproduced for the first time with a sufficient data amount, unless a complete evaluation result is obtained. Therefore, in the magneto-optical disc apparatus 1, in the case of a sector to be reproduced for the first time when the data amount is sufficient, the succeeding sector is processed only when this complete evaluation result is obtained, and the audio data which may have a slight error is processed. Is read retried to ensure that the audio data is reproduced.

Thus, by switching the evaluation result for setting the evaluation status to OK according to the data amount of the memory circuit 14, the evaluation criterion for judging whether or not the audio data has been correctly reproduced can be switched according to the data amount. This is intended to prevent sound interruption beforehand and reduce occurrence of abnormal noise.

Here, the system control circuit 7 outputs a complete, OK, NG or unknown evaluation result by executing the check processing subroutine shown in FIG. 8 and FIG. That is, the system control circuit 7 proceeds from step SP50 to step SP51, and determines whether or not the identification data C2PO is at the L level for the target sector. Here, in the system control circuit 7, when the identification data C2PO rises in the sector, EI
The B flag is raised to the H level. At step SP51, it is determined whether or not the identification data C2PO is at the L level for the target sector by determining whether or not the EIB flag is at the L level.

If a positive result is obtained, the system control circuit 7 proceeds to step SP52 to determine whether or not sync data has been detected at a correct timing.
Here, in the encoder / decoder 15, when the sync data is detected at the correct timing, the SYOK flag is raised to the H level, and the system control circuit 7 determines whether or not this flag is at the H level. It is determined whether or not the sync data is detected at the correct timing.

If an affirmative result is obtained here, the system control circuit 7 proceeds to step SP53 to determine whether or not the header flag HF is held at the L level. If an affirmative result is obtained here, step SP54 is performed. To
It is determined whether or not the current header CH is held at the L level. If an affirmative result is obtained here, the system control circuit 7 proceeds to step SP55 to set a complete evaluation, and then proceeds to step SP56 to complete this subroutine.

That is, the identification data C2PO, the header flag HF and the current header C
When H is held at the L level, it can be determined that the entire sector has been correctly reproduced for this sector. As a result, the system control circuit 7 evaluates that the audio data has been completely reproduced in this case,
Set the evaluation result to the complete evaluation result.

On the other hand, if a negative result is obtained in step SP53, the system control circuit 7
Moving to step SP57, it is determined whether or not the header flag HF is held at the L level for the immediately preceding sector. If an affirmative result is obtained here, the system control circuit 7 proceeds to step SP58 and judges whether or not the current header CH is held at the L level for the immediately preceding sector. If an affirmative result is obtained here, the step proceeds to step SP58. After the process goes to SP55 to set the complete evaluation, the process goes to step SP56 to complete this subroutine.

That is, the header flag H is set in the immediately preceding sector.
F and the current header CH are held at L level, the identification data C2PO is held at L level in the target sector,
If the sync data is detected at the correct timing, it can be determined that the audio data has been correctly reproduced even if the header flag HF has risen in the target sector. As a result, the system control circuit 7 evaluates that the audio data has been completely reproduced in this case,
Set the evaluation result to the complete evaluation result.

On the other hand, if a negative result is obtained in step SP57, the system control circuit 7
The procedure moves to step SP59, where the evaluation result is set to an unknown evaluation result, and this subroutine is completed. That is, even when the identification data C2PO is held at the L level in the target sector and the sync data is detected at the correct timing, if the header flag HF rises in the target sector and the immediately preceding sector, In the case of the target sector, there is a characteristic that it cannot be determined whether or not the audio data has been correctly reproduced. Therefore, the system control circuit 7 sets the evaluation result to unknown in this case.

Therefore, in this case, the system control circuit 7 sets the OK or NG evaluation status in accordance with the amount of data in the memory circuit 14 and the number of read retries, thereby reproducing the audio data correctly. The evaluation criterion for obtaining or not is switched as required.

On the other hand, if the sync data cannot be detected at the correct timing, or if the current header CH rises in the immediately preceding sector or the target sector, step SP52 and step SP5 are respectively performed.
A negative result is obtained in step 8 or step SP54.
In this case, in any case, the audio data can be determined to have been reproduced erroneously.
In step SP60, the evaluation result is set to NG.
After the setting, the process proceeds to step SP56.

Even in this case, the system control circuit 7 sets the evaluation status of OK or NG according to the data amount of the memory circuit 14 and the number of read retries by executing the evaluation processing described above with reference to FIG. As a result, the evaluation criterion for determining whether or not the audio data has been correctly reproduced is switched as required.

On the other hand, if the identification data C2PO rises in the target sector, a negative result is obtained in step SP51, so that the system control circuit 7 proceeds to step SP61, where SYO is performed.
By determining whether or not the K flag is at the H level, it is determined whether or not the sync data has been detected at the correct timing.

If an affirmative result is obtained, the system control circuit 7 proceeds to step SP62 to determine whether or not the header flag HF is held at the L level.
Here, if a positive result is obtained, the process shifts to step SP63 to determine whether or not the current header CH is held at the L level. Here, if a negative result is obtained, the system control circuit 7 proceeds to step SP64, sets OK evaluation, and then proceeds to step SP56 to complete this subroutine.

That is, even when an error is detected in the target sector, if the sync data is detected in this sector at the correct timing, and both the header flag HF and the current header CH are held at the L level, the audio for this sector is It is practically sufficient to judge that the data has been correctly reproduced. Therefore, in this case, the system control circuit 7 determines that the evaluation result is OK.
And OK or NG according to the data amount of the memory circuit 14 and the number of read retries based on the evaluation result.
Is set, and the evaluation criterion of whether or not the audio data has been correctly reproduced is switched as required.

On the other hand, if a negative result is obtained in step SP62, the process proceeds to step SP65 in the system control circuit 7, where it is determined whether or not the header flag HF is held at the L level for the immediately preceding sector. I do. Here, if a negative result is obtained, it means that the audio data cannot be correctly reproduced for either the immediately preceding sector or the target sector. In this case, the sector cannot be specified, and the system control circuit 7 moves to step SP59. Thus, in the system control circuit 7, after setting an unknown evaluation, the process proceeds to step SP57 to complete the subroutine.

On the other hand, if an affirmative result is obtained in step SP65, the process proceeds to step SP66 in the system control circuit 7, where it is determined whether or not the current header CH is held at the L level for one previous sector. to decide. If a positive result is obtained here, the audio data can be processed based on the time information of the previous sector. In this case, the system control circuit 7 proceeds to step SP64, sets an evaluation of OK, and sets the evaluation to OK. End the subroutine.

On the other hand, there is an error in the target sector,
In the case where the header can be detected at the correct timing in the target sector, and the current header CH has risen in the target sector or the immediately preceding sector,
When a negative result is obtained in step SP63 or step SP66, the system control circuit 7 proceeds to step SP60. In this case, the system control circuit 7 sets the evaluation result of NG in this case, and then sets the evaluation status of OK or NG according to the amount of data in the memory circuit 14 and the number of read retries. The evaluation criterion of whether or not the reproduction has been performed is switched as needed.

On the other hand, if the header cannot be detected at the correct timing in the target sector, the system control circuit 7
In the case of, a negative result is obtained in step SP61, and the routine goes to step SP68. Here, the system control circuit 7 determines whether or not the header flag HF is held at the L level. If an affirmative result is obtained here, the process proceeds to step SP69 to determine whether or not the current header CH is held at the L level. to decide.

If a positive result is obtained here, it can be determined that the audio data of this sector has been correctly reproduced, so that the system control circuit 7
The process moves to step SP64 to set an OK evaluation result.
On the other hand, the header flag HS or the current header CH
In this case, since it cannot be determined whether or not the audio data has been correctly reproduced, the system control circuit 7 proceeds to step SP59.
Set an unknown rating.

After evaluating the reproduction result of the audio data in this manner, by setting the evaluation status of OK or NG according to the data amount of the memory circuit 14 and the number of read retries based on the evaluation result, The evaluation criteria for whether or not the audio data has been correctly reproduced can be switched as needed, thereby preventing sound interruption and reducing occurrence of abnormal noise.

(3) Other Embodiments In the above-described second embodiment, the case where the evaluation criterion is switched according to the amount of data and the number of read retries is switched at the same time has been described. However, the switching of the number of read retries may be omitted. Furthermore, in the above-described embodiment, a case has been described where it is determined whether audio data has been correctly reproduced based on a header flag or the like. However, the present invention is not limited to this, and various determination criteria such as a C1 error check may be used. Can be widely applied.

[0103]

As described above, according to the present invention, there is provided an optical disc reproducing apparatus for reproducing, from an optical disc, recording data recorded in a predetermined block unit by adding a header.
Reproducing means for sequentially reproducing recorded data from the optical disk in block units; and error correcting processing for performing predetermined error correction processing on the recorded data reproduced from the optical disk by the reproducing means and outputting an error correction processing result. Means, sector discriminating means for discriminating whether or not the header has been correctly reproduced with respect to the recording data reproduced from the optical disk by the reproducing means, and error correction processing output from the error correction processing means. Memory means for temporarily storing recording data;
Evaluation means for evaluating the recording data fetched into the memory means based on the error correction processing result output from the error correction processing means and the discrimination result of the sector discrimination means; and an optical disk based on the evaluation result of the evaluation means. Setting means for setting the number of re-executions of the reproduction of the recorded data recorded in the memory means, and changing means for changing the evaluation criterion in the evaluation means based on the accumulation amount accumulated in the memory means and the number of re-executions. With this configuration, it is possible to realize an optical disc reproducing apparatus that can prevent sound breakage and reduce occurrence of abnormal noise.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a magneto-optical disc device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a detailed configuration thereof.

FIG. 3 is a signal waveform diagram for explaining the operation.

FIG. 4 is a signal waveform diagram showing details thereof.

FIG. 5 is a flowchart for explaining the operation of the system control circuit;

FIG. 6 is a flowchart for explaining the second embodiment.

FIG. 7 is a flowchart for explaining the evaluation processing.

FIG. 8 is a flowchart for explaining a part of the check processing.

FIG. 9 is a flowchart for explaining the remaining part of the check processing.

FIG. 10 is a schematic diagram used to explain control of a memory circuit;

[Explanation of symbols]

1 ... Magneto-optical disk device, 3 ... Optical pickup, 6
... Servo circuit, 7 system control circuit, 12 voice compression / expansion circuit, 13 memory controller, 14
... memory circuit, 15 ... encoder / decoder.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 20 / 18,20 / 10

Claims (1)

(57) [Claims] (1)A header is added and recorded in specified block units.
An optical disk that reproduces recorded data from an optical disk
In the playback device, The recording data from the optical disk
Playback means for playing back, A record reproduced from the optical disc by the reproducing means.
Performs predetermined error correction processing on recorded data to correct errors
Error correction processing means for outputting a processing result, A record reproduced from the optical disk by the reproducing means.
Whether the header was played correctly for the recorded data
Sector determining means for determining The error correction processing output from the error correction processing means is performed.
Memory means for temporarily storing the recorded data, Error correction processing result output from the error correction processing means
And the memory based on the determination result of the sector determination means.
Evaluation means for evaluating the recorded data captured by the means
When, On the optical disk, based on the evaluation result of the evaluation means,
Set the number of replays of the recorded data recorded in the
Setting means for The storage amount stored in the memory means and the re-execution times
Change the evaluation criteria in the above evaluation means based on the number
Change means and Optical disc reproduction equipment characterized by comprising
Place.