JP3315479B2 - Disc playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk reproducing apparatus for reproducing an information signal recorded on a medium such as an optical disk and, more particularly, to intermittently reading a compressed signal recorded on a disk and temporarily reading the compressed signal. The present invention relates to a disk reproducing apparatus that, after storing data in a storage means such as a buffer memory, continuously reads data from the storage means and reproduces an information signal.

[0002]

2. Description of the Related Art As a device for reproducing a disk-shaped medium on which information signals such as audio signals are recorded, an information signal reproducing device (disk reproducing device) represented by a CD (compact disk) has been put to practical use. In recent years, radio technology March 1993, p. 165-p. 180, an information signal recording / reproducing apparatus using an MD system disclosed in "All of Sony MD (Mini Disk) Technology". The MD is for recording / reproducing an information signal obtained by compressing data on a disk by a magneto-optical method.

In the MD system, since a compressed signal is recorded on a disk, the transfer rate of data transferred to a data decompression circuit is one of the data read rate from the disk.
/ 4. Therefore, the signal is read from the disk for only 1/4 of the time, and normal reproduction can be performed in principle for the remaining 3/4 even if the reading is stopped. In fact, when a 4 Mbit buffer memory is used, normal reproduction can be continued for 12 seconds even if signal reading from the disk is stopped.

FIG . 6 is a block circuit diagram showing a configuration of a conventional disk reproducing apparatus using an MD. In the figure, 1
Is a recorded disk, 2 is an optical pickup, 3 is RF
Amplifier, 4 demodulation circuit, 28 error control circuit, 6 buffer memory, 7 data expansion circuit, 8 digital / analog (D / A) conversion circuit, 9 audio signal output terminal, 1
0 is an address decoder, 11 is a control microcomputer, 12 is a buffer memory control circuit, 13 is a servo circuit, 14 is a disk rotation and pickup feed motor, 15 is a key input, and 16 is a display circuit.

[0005] Hereinafter, an operation for reproducing normal voice signals will be described with reference to FIG. The signal recorded on the disk 1 is intermittently read under the control of the servo circuit 13 by the reflected light of the light emitted from the optical pickup 2 to the recorded disk 1. The light information is converted into an electric signal by the optical pickup 2 and supplied to the RF amplifier 3. The signal amplified by the RF amplifier 3 is supplied to a demodulation circuit 4 where demodulation such as EFM is performed to restore the original signal sequence.

On the other hand, the output of the RF amplifier 3 is also supplied to the address decoder 10. In order to take out information contained in the light spot guide groove which has been previously engraved on the disc 1, the address decoder 10 reproduces an address signal continuous over the entire circumference of the disc 1 to obtain tracking information. This tracking information is supplied to a servo circuit 13, where a tracking servo is applied so that the optical pickup 2 scans a predetermined guide groove, and a servo that keeps the disk rotation at a constant linear velocity is applied.

The error control circuit 28 performs processing such as error correction on the signal sequence restored by the demodulation circuit 4. FIG.
Is a block circuit diagram showing a configuration of an error control circuit in a conventional disk reproducing apparatus using an MD. In the figure, reference numeral 17 denotes an input terminal to which a signal sequence from a demodulation circuit is input, 18 denotes an error correction circuit, and 19 denotes an error correction circuit. A deinterleave circuit, 20 is an error judgment circuit, 21 is an output terminal for supplying a signal to the buffer memory, and 27 is an output terminal for outputting the judgment result of the error judgment circuit to the microcomputer 11.

[0008] Hereinafter, first described the operation until data is written into the buffer memory 6 with reference to FIG. The signal sequence supplied to the input terminal 17 is first sent to an error correction circuit 18.
, Where the error in the signal sequence is corrected using the error correction code included in the signal sequence. Subsequently, in the deinterleave circuit 19, the signal sequence rearranged by the interleave processing is returned to the original sequence.

The deinterleaved signal sequence constitutes one data group in units of sectors and clusters. FIG. 8 is a diagram showing a sector
It is a conceptual diagram showing the structure of data. As shown in the figure, 1
A sector is composed of a sync, a header, and data, and 12 bytes, 4 bytes, and 2336 bytes are given to each sector. Therefore, one sector is composed of 2352 bytes.
One cluster is composed of 32 sectors, and the cluster is the highest data unit in the MD system.

In FIG . 8 , "sync" is information for synchronizing a signal read from the disk, and "header" includes position information, which is information indicating a cluster and a sector to which the read signal belongs. Part. Also,
"Data" includes information signals such as audio data.

[0011] The deinterleaved signal sequence shown in FIG . 8 is supplied to an error determination circuit 20. The error determination circuit 20 makes the following error determination on the sector data to be written into the buffer memory 6, and supplies the determination result to the microcomputer 11 through the output terminal 27. Is there any continuity in the position information between the sector data currently input to the error determination circuit and the previous sector data? 2 from header to data to sink
Is there an error in the 352-byte data that cannot be corrected even by error correction?

Here, the error determination in the error determination circuit 20 is performed a while after the header is read as shown by X and Y in FIG. Error determination for (in the figure,
Y) indicates that the error determination is based on the currently input header, ie,
While the error determination is performed for B in FIG. 6 , the error determination is performed for the sector data (A in FIG . 6) including the previous header, data, and sync.

The signal sequence for which an error has been determined is supplied to the buffer memory 6 through the output terminal 21 of the error control circuit 28. FIG. 9 is a schematic diagram showing a method of controlling the writing of sector data to the buffer memory in the MD system. In other words, the data series supplied to the error determination circuit 20 and the buffer memory writing output from the buffer memory control circuit 12 are written. The relationship between control commands and the data sequence actually written to the buffer memory 6 are shown. In the figure, the sector data to be written to the buffer memory 6 (hereinafter referred to as a target sector) is defined as the N-th sector, and the immediately preceding and second previous sector data are respectively assigned to the N-th sector.
As the first and (N-2) th sector, the next sector data is defined as the (N + 1) th sector.

Here,FIG.As shown in FIG.
Sector with the target sector as the target sector and the Nth sector as the first sector.
-When trying to write a data group to the buffer memory 6
From the buffer memory control circuit 12 to the buffer memory 6
The buffer memory write control signal sent toFIG.
As shown in (b), the data of the (N-1) th sector is
High level at the time of error judgment (B in the figure)
Must be written to the buffer memory 6 at this time.
The stored data is stored in the Nth sector as shown in FIG.
This is the data after the header. The buffer memory control cycle
Buffer memory write control command output from path 12
Is set to high level in the "Memory Write Window".
Opening the cue "and making it a low level
"Close memory write window".

That the data of the (N-1) th sector of the signal sequence supplied to the error determination circuit 20 has satisfied the error determination;
That is, a signal indicating that the position information of the data in the (N-2) th sector and the (N-1) th sector has continuity is output from the error determination circuit 2.
0 to the microcomputer 11 , a control command is issued from the microcomputer 11 to the buffer memory control circuit 12 to write the sector data to the buffer memory 6, and the buffer memory control circuit 12 opens the memory write window, and The memory 6 is in the write mode.

However, when the data of the (N-1) th sector of the supplied signal sequence does not satisfy the error determination, that is, when the position information of the data of the (N-2) th sector and the (N-1) th sector is not continuous, In this case, a control command for writing data is not sent from the microcomputer 11 to the buffer memory control circuit 12, the buffer memory control circuit 12 keeps the memory write window closed, and the buffer memory 6 does not enter the write mode.

FIG . 10 is a flowchart showing a control method of the conventional MD disk reproducing apparatus when writing data to the buffer memory is started. The process up to the start of writing the sector data group into the buffer memory 6 will be described in detail with reference to FIG. First, target sector data in a target cluster on the disk 1 ( FIG. 9)
The data is read from the disk by moving the pickup 2 to the position 4 to 5 sectors before (Nth sector of (a)) (step S1), and the data read from the disk is amplified, modulated, After performing processing such as deinterleaving, the error determination circuit 20 performs the above-described error determination on the data in the (N-2) th sector and the (N-1) th sector (step S2). Here, the error judgment is O
If K is reached, the memory write window is opened as described above, the buffer memory 6 enters the write mode, and writes data from the Nth sector which is the target sector to the buffer memory 6 (step S3).

If the error determination is NG in step S2, the process returns to step S1 to start writing from the data of the Nth sector again (this operation is called a recovery operation). It is determined how many times the recovery operation has been performed (step S11). If the recovery operation using the Nth sector as the target sector is a predetermined number of times or more, for example, the third time, the target sector is changed backward by one. To be the (N + 1) th sector (step S
12) Return to step S1. This means that when there is no continuity between the data immediately before and two before the sector data to be written to the buffer memory, the writing of the sector data group starting from the target sector to the buffer memory 6 is started. This is because, as a next best measure, writing to the buffer memory 6 is started from a data group starting from a sector one after the target sector. If the recovery operation in the same target sector is the second or less, the process returns to step S1, and the start of data writing from the Nth sector is considered again.

Next, at the time point (C) in FIG. 9A, an error determination is performed on the data data of the (N-1) th sector and the Nth sector (step S4) and an error determination is performed on the data of the (N-1) th sector. (Step S5) is performed.
If it is K, the data writing window is kept open and the data writing to the buffer memory 6 is continued. Subsequently, at the time (D) in FIG. 9A, an error determination is performed on the data of the Nth sector and the (N + 1) th sector (step S6), and an error determination is performed on the data of the Nth sector (step S7). If both are OK, the data writing to the buffer memory 6 is continued while the memory writing window remains open. In this way, a series of controls for starting writing data to the buffer memory 6 is completed, and a sector data group starting from the Nth sector is written to the buffer memory 6.

Here, as shown in steps S4 to S7, when the error judgment or the result of the error judgment in the error judgment circuit 20 is NG, the memory writing window is closed in the next step in any case ( In step S10), a recovery operation is performed in a subsequent step. If the recovery operation in the same target sector is the third time, similarly to the control from step S2, the target sector is changed backward by one to be the (N + 1) th sector (step S2).
12) Return to step S1.

The memory control method shown in FIG.
Although the control for starting the writing of data to the buffer memory 6 has been described, while the data is being written to the buffer memory 6, the error determination and the error for the data to be written to the buffer memory 6 are continued. . FIG. 11 shows a conventional MD disk reproducing apparatus.
6 is a flowchart illustrating an example of a control method when data writing to a buffer memory is continued. Hereinafter, the operation of writing data to the buffer memory 6 will be described in detail with reference to FIG.

First, based on the control method shown in FIG. 10, when the writing of the sector data group to the buffer memory 6 is started, the next target sector to be written to the buffer memory 6 (for example, the (N + 1) th sector) If it is assumed that up to sectors have been written to the buffer memory 6, the target sector here is the (N + 2) th sector.)
And step S18.

If the error determination for the target sector is OK in steps S17 and S18, respectively, the memory write window remains open and the target sector remains in the buffer memory 6.
Written to If any one of the errors is not determined to be OK, the memory write window is immediately closed, and similarly to the control shown in FIG. 10 , first, it is determined whether or not the recovery operation is the third time. If the recovery operation in the target sector is the third time, the target sector is updated by one backward, and an error determination is performed on the updated target sector. If the recovery operation is the second or lower operation, the recovery operation is performed so that the target sector data is read from the disk 1 again (step S21).

Subsequently, it is determined whether or not the writing of the data into the buffer memory 6 is completed (step S).
19) When writing is continued, the target sector is updated by one backward, an error is determined for the updated target sector, and the above-described control is repeated to transfer the sector data to the buffer memory 6. Continue writing. When the writing is completed, the memory writing window is closed, and the writing of the sector data group into the buffer memory 6 started based on the control method shown in FIG. 10 is completed.

Here, the buffer memory control circuit 12
When a specified amount of data is written in the buffer memory 6, the writing of the data is stopped, and when the data is continuously read and the amount of data becomes less than a certain amount, the writing of the data is restarted. In the following description, a specified amount of data for stopping writing of data in the buffer memory 6 is referred to as a threshold, and a specified amount of data for restarting writing of data is referred to as a threshold.

FIG . 12 shows the prior art and the first embodiment of the present invention.
FIG. 6 is a schematic diagram showing a time change of the information amount in the buffer memory of the disk reproducing apparatus using the MD in FIG. As shown in this figure, when the buffer memory 6 is filled with the data at the time t0, the reproduction of the signal from the disk 1 is stopped at that time, the writing of the data to the buffer memory 6 is stopped, and at the time t0, The address on the disk 1 is stored. From time t0 to time t5, data is read from the buffer memory 6 and the data amount decreases. When the data amount reaches a threshold value, a control signal is sent from the microcomputer 11 to the servo circuit 13, and the motor 14 At t5, the optical pickup 2 is returned to the position of the address stored at time t0 to continue the reproduction of the signal, and the writing of data to the buffer memory 6 is restarted. Note that time t
The data is continuously read from 5 to t6.

Similarly, when the amount of data in the buffer memory 6 reaches the threshold value at time t6, the disk 1
To stop writing data to the buffer memory 6 and store the address on the disk 1 at time t6. Next, from time t6 to t11
When the data is read from the buffer memory 6 during the period and the data amount reaches the threshold value, the optical pickup 2 is returned to the address point stored at the time t6 at the time t11 to start the reproduction, and the data is transferred to the buffer memory 6. Resume data writing. In other words, the signal writing to the buffer memory 6 is performed intermittently.
The reading of signals from is performed continuously.

At time t5 and time t11 in FIG. 12 , control ( FIG. 10 ) for starting data writing to the buffer memory is executed, and time t5 to t6 and time t11
Needless to say, the control ( FIG. 11 ) for continuing the data writing to the buffer memory is executed during the period from t12.

The information signal once written in the buffer memory 6 through such a process is continuously read at a rate of about 1/4 of the data rate at the time of writing into the buffer memory 6, and the data is expanded. After being expanded four times in the circuit 7, it is converted into an analog signal by the digital / analog conversion circuit 8 and output from the audio signal output terminal 9 as an information signal such as an audio signal.

[0030]

Here, as described above, the buffer memory 6 from the Nth sector shown in FIG.
9B, whether the memory write window can be opened before the data of the Nth sector is input to the buffer memory 6 as shown in FIGS. 9B and 9C. N-2 sector and N-1
It depends on whether or not an error decision is made on the sector.

In other words, when the position information of the data in the (N-2) th sector and the (N-1) th sector is not continuous, the control method shown in FIG. In this case, even if there is no error in the data of the Nth sector,
There is a problem that writing of data from the sector cannot be started.

In the control method shown in FIG. 11 , even when data is written to the buffer memory, if there is no continuity between the position information of the data of the target sector and the data of the preceding sector, There is a problem that even if no error exists in the data of the target sector, the data of the target sector is lost.

The present invention has been made in order to solve the above-mentioned problems, and in a method of reproducing an information signal recorded on a disk-shaped medium, the information signal recorded on the disk due to a scratch on the disk or the like. It is an object of the present invention to provide a disk reproducing apparatus that performs a recovery operation and an error process promptly when information cannot be read correctly and reproduces an information signal without causing loss of information.

[0034]

According to the disk reproducing apparatus of the present invention, an information signal such as an audio signal is compressed as an information source and a signal recorded on a disk-shaped medium is temporarily and intermittently written into a storage means. A disk reproducing apparatus that continuously reads and reproduces the information signal unit, and the information signal unit immediately before the target information signal unit to start writing to the storage unit .
For determining the continuity of the immediately preceding information signal unit and starting writing of the target information signal unit to the storage means ;
In a disc reproducing apparatus having control means for controlling to issue a write control command , any two consecutive information
Error determination means for determining continuity of position information in signal units
If, internal position information to calculate the pseudo location information of the information signal and the position information determination means for determining that the positional information has been determined in units other information signal unit based on the position information of the finalized information signal units Computing means, and wherein the controlling means comprises:
By the error determination means one before the target information signal unit
Judgment that there is no continuity in the position information of the previous information signal unit
In the case where the position information is determined,
Position information of the information signal unit immediately before the target information signal unit
If it is determined that has been determined, the information of the goal again
Start playback from the information signal several units before the signal unit,
The information of the information signal unit immediately before the target information signal unit is before
When input to the storage means, the writing
Control to issue a command, and the position information determination means
Position information of the information signal immediately before the target information signal unit
Is not determined and the information immediately before the target information signal unit is
If it is determined that the position information for
Is the target determined by the internal position information calculation means.
Based on the position information of the information signal unit immediately before the information signal unit of
To the information signal unit immediately before the target information signal unit.
Similar position information is calculated, and the pseudo position information is used as the target information.
Assuming the position information of the information signal unit immediately before the information signal unit
Te, again several units before the information signal of the target information signal unit
Starts playback from the disc-shaped medium from the target
The information of the information signal unit immediately before the information signal unit of
When input to the storage means, the write control
Command, and the error determination means
Information unit and the position information of the previous information signal unit
If it is determined that there is no continuity in the
The position information of the target information signal unit is
If it is not determined, the internal position information meter
The information signal unit immediately before the target information signal unit
Pseudo position of the target information signal unit based on the position information of the position
Calculating information, and converting the pseudo position information to the information signal of the target.
Information for the storage means, assuming unit location information
Control to continue writing signals.

[0035]

[0036]

In the present invention, the target of the target is determined by the error determination means.
Information signal one before and two before the information signal unit (Nth sector)
Location information (N-2 sector and N-1 sector)
When it is determined that there is no continuity in the
The information signal immediately before the target information signal unit by the determination means
Judge that the position information of the unit is determined (that is, read)
Again, the target information signal unit is re-entered in several units (number
Sector) Starts playback from the previous information signal and returns to the target information signal.
Information signal unit (N-th sector) immediately before the signal unit (N-th sector).
Information of one sector) is input to storage means (buffer memory)
Control to forcibly issue a write control command when
I do. On the other hand, the target information signal
The position information of the information signal immediately before the position is not determined and the target
Information signal unit (N-2 section
If it is determined that the location information of
The target information signal unit determined by the position information calculation means
Target information signal based on the position information of the previous information signal unit
Calculate the position information of the information signal unit immediately before the unit (this
The calculated position information is called “pseudo position information”),
Position information is the information signal unit immediately before the target information signal unit
Assuming the position information of (N-1 sector), the target
Disc signal from the information signal several units before the information signal unit
Starts playback from the previous information unit of the target information signal unit.
Information of the broadcast signal unit (N-1st sector) is input to the storage means.
Control to forcibly issue a write control command when
I do. The target information signal unit (Nth
) And the previous information signal unit (N-1 sector)
When it is determined that there is no continuity in the location information of
The position information of the target information signal unit is obtained by the position information determination means.
If it is determined that is not determined, internal location information calculation
Information signal unit immediately before the target information signal unit by means
Pseudo-position information for each target information signal based on the position information
Calculate and convert pseudo position information to target information signal unit position information
And continue writing the information signal to the storage means.
Control to run.

[0037]

[0038]

[Embodiment 1] FIG. 1 is a block circuit diagram showing a configuration of a disk reproducing apparatus using an MD according to the first embodiment of the present invention. In the figure, reference numerals 1 to 4 and 6 to 16 are functional blocks similar to those of the conventional technique shown in FIG. 5 is a data processing circuit.

Next, the operation will be described with reference to FIG. The signal recorded on the disk 1 is intermittently read under the control of the servo circuit 13 by the reflected light of the light emitted from the optical pickup 2 to the recorded disk 1. Hereinafter, the operation until the information read from the disk 1 is supplied to the data processing circuit 5 is the same as the operation until the information read from the disk 1 is supplied to the error control circuit 28 in the related art. The description is omitted because it is the same. A feature of the present invention lies in a data processing method in the data processing circuit 5.

FIG. 2 is a block circuit diagram showing a configuration of the data processing circuit 5 of the disk reproducing apparatus using the MD according to the first embodiment of the present invention. In the figure, explanation since 17 to 21 and 27 is the same functional blocks as the conventional art shown in FIG. 7 will be omitted. 22 is a position information determination circuit, 2
3 is an internal position information calculation circuit, 24 is a position information determination circuit 2
2 is an output terminal for outputting the determination result to the microcomputer 11, 25 is an output terminal for outputting the calculation result of the internal position information calculating circuit 23 to the microcomputer 11, and 26 is a control signal output from the microcomputer 11 for calculating the internal position information. Input terminal for input to the circuit 23.

FIG. 3 is a flowchart showing a control method of the disk reproducing apparatus according to the first embodiment of the present invention when writing data to the buffer memory is started. Hereinafter, the control up to the start of the writing of the sector data group into the buffer memory 6 will be described in detail with reference to FIGS. In this embodiment, the relationship between the data sequence supplied to the error determination circuit 20 and the buffer memory write control command output from the buffer memory control circuit 12 is shown in FIG.

First, the pickup 2 is moved four to five sectors before the target sector data in the target cluster on the disk 1 to read data from the disk (step S).
1) As described in the conventional example, after performing processing such as amplification, modulation, and deinterleaving on data read from the disk 1, the error determination circuit 20 causes the error determination circuit 20 to perform the (N-2) th sector and the (N-1) th sector. An error is determined for the data in the sector (step S2).

Here, when the error determination is OK, the memory write window is opened as in the conventional example, the buffer memory 6 enters the write mode, and the buffer memory 6 is moved from the Nth sector which is the target sector. Data is written (step S3). A first feature of the present invention resides in a reproduction control method when an error determination is NG in step S2.

In the disk reproducing apparatus according to the present invention,
If it is determined in step S2 that the data in the (N-2) th sector and the (N-1) th sector are not continuous, error processing 1 (step S8) is performed. FIG. 4 is a flowchart showing a control method of the error processing 1 of the disk reproducing apparatus according to the first embodiment of the present invention. Hereinafter, the control process of the error processing 1 will be described in detail with reference to FIGS.

Here, in the error determination circuit 20, two consecutive sectors , the (N-2) th sector and the (N-1) th sector , are provided.
The position information of the data is determined not to be continuous, there is a case of three kinds shown below. The case where the position information of the ( N-2) th sector could be read correctly, but the position information of the ( N-1) th sector could not be read (due to a scratch or the like on the disk). When the position information of the (N-1) th sector can be read correctly, but the position information of the (N-2) th sector cannot be read. N-1 sector and
When both the position information of the (N-2) th sector cannot be read.

In the control process of error processing 1, step S2
, The causes for which the position information of the data in the (N-2) th sector and the (N-1) th sector are determined not to be continuous are classified into the above three, and an error processing method corresponding to each of them is adopted.

First, the position information determination circuit 22 determines whether or not the position information of the (N-1) th sector has been read (step S13). The determination result is sent to the microcomputer 11 through the output terminal 24. . Here, if the position information of the (N-1) th sector has been successfully read, the pickup 2 is moved again 4 to 5 sectors before the target sector data in the target cluster on the disk 1 to move the pickup 2 from the disk. The data is read (step S1), and the data of the (N-1) th sector is again input to the error determination circuit 20 to perform the error determination on the data of the (N-1) th sector, at a time point (B) in FIG. To forcibly open the memory write window (step S3).

If the position information of the (N-1) th sector cannot be read, the information relating to the position information of the (N-2) th sector is sent from the error judgment circuit 20 to the position information judgment circuit 22, and the position information In the judgment circuit 22, the N-th
It is determined whether the position information of two sectors has been read (step S14). If the position information has not been read, the process proceeds to step S11, and a recovery operation is performed as in the conventional technique.

Next, if the position information of the (N-2) th sector has been successfully read, the position information is counted up by one in the internal position information calculation circuit 23 to obtain the internal position information (step S15) This internal position information is output to the microcomputer 11 through the output terminal 25.

In the microcomputer 11, the internal
Assuming that the position information is the position information of the (N-1) th sector,
Of the target sector data in the target cluster on the disk 1
Move the pickup 2 4 to 5 sectors before the disk
(Step S1), and the N-1 section
Is again input to the error determination circuit 20 and the N-th data
An error is determined for one sector of data.FIG.
At the time of (B) in (a), the memory writing window is changed.
Forcibly open (step S3). like this
In error processing 1, the (N-2) th sector and the (N-1) th sector
If both locations cannot be read, recovery
Mode, but in other cases,
To open the memory writing window.

Next, at step S4 in FIG.
The error determination for the data of the 1st sector and the Nth sector and the determination of the Nth sector and the Nth
An error determination is performed on the data of one sector, and if the result is OK, the memory write window is kept open and the sector data group is transferred to the buffer memory 6 as in the conventional technique. Writing is started. Also, in steps S5 and S7, when the result of the error determination is NG, the memory write window is closed and the process proceeds to step S11, which is the same as the conventional technology. A second feature of the present invention is that the result of the error determination in steps S4 and S6 is N
In the method of reproduction control in the case of G.

In the disk reproducing apparatus according to the present invention,
If it is determined in steps S4 and S6 that the data in the sector one ahead of the target sector and the data in the target sector are not continuous, error processing 2 (step S9) is performed. FIG.
5 is a flowchart illustrating a control method of error processing 2 of the disk reproducing apparatus according to the first embodiment of the present invention.
The control process of the error process 2 will be described in detail with reference to FIGS.

First, the position information judgment circuit 22 judges whether the position information of the target sector could be read (step S 16 ), and sends the judgment result to the microcomputer 11 through the output terminal 24. Here, when the position information of the target sector can be read, the memory write window is immediately closed, and the operation shifts to the recovery operation. This means that despite the fact that the position information of the target sector could be read, there was no continuity between the position information of the target sector and the position of the previous sector. Is incorrectly read, or the internal position information of the sector immediately before the target sector was incorrectly calculated because the position information of the sector immediately before the target sector was not read correctly. It is.

If the position information of the target sector cannot be read, the position information of the sector immediately before the target sector is counted up by one in the internal position information calculation circuit 23, and the internal position information is calculated. And If the sector immediately before the target sector cannot read the position information and uses the internal position information, the internal position information is counted up by one. The internal position information thus obtained is output to the microcomputer 11 through the output terminal 25.

The microcomputer 11 assumes that this internal position information is the position information of the target sector and proceeds to steps S5 and S7 in FIG. 3, and the data of the (N-1) th and Nth sectors satisfy the error judgment. In this case, writing of sector data to the buffer memory 6 is started.

In this embodiment, the memory write window is once opened in step S3, and the N-th memory window is opened in steps S5 and S7, respectively.
When it is determined that there is an error in the data of the 1st sector and the Nth sector, the memory write window is closed. If it is determined that there is no error up to the data of the Nth sector, a memory write window may be opened after performing the recovery operation.

Further, in the present embodiment, step S11
In the above, the number of recovery operations allowed in the same target sector is set to two, but this may be set to an arbitrary number.

Further, in the present embodiment, the position information determination circuit 22 and the internal position information calculation circuit 23 are provided as independent function blocks, but these may be provided as internal functions of the microcomputer 11.

[0059]

[0060]

[0061]

[0062]

[0063]

[0064]

[0065]

[0066]

[0067]

[0068]

[0069]

[0070]

[0071]

[0072]

[0073]

According to the present invention , a scratch on a disk-shaped medium is provided.
Some information cannot be read due to the location information
Even if you do, continuous playback of information without missing information
You can get started.

[0074]

[0075]

[Brief description of the drawings]

FIG. 1 is a block circuit diagram illustrating a configuration of a disc reproducing apparatus using an MD according to a first embodiment of the present invention.

FIG. 2 is a block circuit diagram illustrating a configuration of a data processing circuit of the disk reproducing device using the MD according to the first embodiment of the present invention.

FIG. 3 is a flowchart illustrating a control method of the disk reproducing apparatus according to the first embodiment of the present invention when writing data to the buffer memory is started.

FIG. 4 is a flowchart illustrating a control method of error processing 1 of the disk reproducing apparatus according to the first embodiment of the present invention.

FIG. 5 is a flowchart illustrating a control method of error processing 2 of the disk reproducing apparatus according to the first embodiment of the present invention.

FIG. 6 is a block circuit diagram showing a configuration of a conventional disk reproducing apparatus using an MD.

FIG. 7 is a block circuit diagram showing a configuration of an error control circuit in a conventional disk reproducing apparatus using an MD.

FIG. 8 is a conceptual diagram showing a configuration of sector data of the MD system.

FIG. 9 is a schematic diagram illustrating a method of controlling writing of sector data to a buffer memory in the MD system.

FIG. 10 is a flow chart showing an example of a control method when starting writing data to a buffer memory in a conventional MD disk reproducing apparatus.

FIG. 11 is a flow chart showing an example of a control method of a conventional MD disk reproducing apparatus when writing data to a buffer memory is continued.

FIG. 12 is a schematic diagram illustrating a temporal change in the amount of information in a buffer memory of a disk reproducing device using an MD according to the related art and the first embodiment of the present invention.

[Explanation of symbols]

 5 Data Processing Circuit 11 Microcomputer 22 Position Information Judgment Circuit 23 Internal Position Information Calculation Circuit 24 Position Information Judgment Result Output Terminal 25 Internal Position Information Output Terminal 26 Control Signal Input Terminal for Internal Position Information Calculation Circuit

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshinobu Ishida Kyoto Baba Zojo, Nagaokakyo-shi, Japan Mitsubishi Electric Corporation Video System Development Laboratory (72) Inventor Kenji Goshima, Baba Zujo, Nagaokakyo-shi, Kyoto 1 (56) References JP-A-4-32073 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 20/18, 20/10

Claims (1)

(57) [Claims] An information signal such as an audio signal is compressed as an information source, and a signal recorded on a disk-shaped medium is intermittently written to a storage means once and then continuously read out for reproduction. And a continuation of the information signal unit immediately before and the information signal unit immediately before the target information signal unit to start writing to the storage unit.
To determine the sex issues a write control instruction to start writing the information signal units of the target in the storage means
In a disk reproducing apparatus having a control means for controlling , continuity of position information of any two continuous information signal units
Error determining means for determining whether the position information of the information signal unit is determined
Position information determining means, and internal position information calculating means for calculating pseudo position information of another information signal unit based on the determined position information of the information signal unit, wherein the control means controls the target by the error determining means. One of the information signal units of
If there is no continuity in the position information of the previous and next information signal units
In the case where it is determined , the position information determination unit determines the target information signal unit.
It is determined that the position information of the previous information signal unit has been determined.
Again, several units before the target information signal unit
Reproduction is started from the information signal, and the target information signal unit is
The information of the previous information signal unit is input to the storage means.
Control to forcibly issue the write control command when
And the position information determination unit determines the target information signal unit.
The position information of the previous information signal is not determined and the target
The position information of the information signal unit immediately before the information signal unit of
If it is determined that the
Step, the information immediately before the determined information signal unit.
Of the target information signal unit based on the position information of the information signal unit.
Calculate the pseudo position information of the immediately preceding information signal unit, and calculate the pseudo position information.
The similar position information is transmitted to the information signal immediately before the target information signal unit.
Assuming that the position information is in units of signals, the target information signal is again
From the disc-shaped medium from the information signal several units before the unit
Playback of the information signal immediately before the target information signal unit.
Strong when the information of the broadcast signal units are input to the SL 憶means
The error control means controls the target information signal unit and the target information signal unit.
Judgment that the position information of the previous information signal unit is not continuous
In the case where the target information signal unit is
If it is determined that the position information is not determined, the internal position information calculating means sets a target information signal unit.
The target information based on the position information of the previous information signal unit
Calculate pseudo position information for each signal, and calculate the pseudo position information.
Assuming the position information of the target information signal unit,
Control to continue writing information signal to memory
A disc reproducing apparatus characterized in that: