JP2000149440A - Reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inform a user of it when a failure occurs in a mini-disk device and reproducing operating is performed again. SOLUTION: An encoder/decoder decodes a reproduced signal supplied through a RF amplifier, and supplies reproduced data to a DRAM 12 through a memory controller. In the DRAM 12, when data of one cluster (corresponds to reproducing time of approximately two seconds) are stored, the data are read out and reproduced. When a failure occurs and the storage quantity reaches a quantity for two seconds or more, characters 'Retry' is displayed on a display section, and a user is informed of the failure. Also, when the storage quantity of the DRAM 12 reaches a quantity for eight seconds, since more data cannot be stored, characters 'Retry Error' is displayed on a display section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus suitable for reproducing an audio signal in, for example, a mini disc apparatus.

[0002]

2. Description of the Related Art FIG. 6 shows a format in a magneto-optical disk (mini disk). As shown in the figure, a lead-in area is provided on the innermost circumference of the disk, and a lead-out area is provided on the outermost circumference. And, between the lead-in area and the lead-out area,
A music signal or the like is recorded, and a user TOC area is provided in an inner peripheral area closest to the lead-in area. In the user TOC area, information necessary for accessing information (usually music) recorded on the disc is recorded.

For example, in this example, six songs from song number 1 to song number 6 are recorded, and the user TO
In the C area, the song numbers 1 to 6 of the six songs, and the starting point addresses A (song number 1), C (song number 2), E (song number 3), G
(Song No. 4), I (Song No. 5), K (Song No. 6) and end addresses B (Song No. 1), D (Song No. 2), F (Song No. 3), H
(Song No. 4), J (Song No. 5), and L (Song No. 6) are recorded.

A track (pre-groove) formed on this disk has a length of 13.3 ms as shown in FIG.
(The frequency is 75 Hz), and the sector address is recorded by FM-modulating this frequency.

FIG. 8 shows a more detailed recording format. One revolution (one track) of the disk is divided into a plurality of sectors, and one cluster is composed of 36 sectors. One cluster is divided into four linking sectors and 32 compressed data recording sectors. The first three of the four linking areas are link sectors, and one is for sub data. In the link sector, compressed data of adjacent clusters are recorded so as to partially overlap. In the sub data area, sub data other than the music signal is recorded.

[0006] Further, sectors are constituted by sound groups. That is, 0, 1, 2, ..., 8, 9,
The eleven sound groups of A correspond to two consecutive sectors. These 11 sound groups are used as a unit for music signal processing.

[0007] In one sound group, audio signals for the left channel and the right channel are recorded in 512 samples (corresponding to 11.61 ms in reproduction time).

In the mini-disc apparatus, in a recording mode, an audio signal to be recorded is compressed and then temporarily stored in a memory. The signal stored in the memory is read out at a predetermined timing and recorded on a disk. In the reproduction mode, the signal reproduced from the disk is temporarily stored in the memory. The signal read from the memory at a predetermined timing is expanded and output.

By temporarily storing the signal to be recorded or reproduced in the memory in this way, even when the recording or reproduction operation must be temporarily interrupted due to external vibration or the like. In the range of the memory capacity, a signal to be recorded or reproduced is prevented from being interrupted on the way.

[0010]

As described above, the conventional mini-disc device is provided with the function of protecting the recording or reproducing operation against vibration, so that the user can operate the mini-disc device relatively frequently. Even when used in a place, the recording or reproducing operation is normally performed, so that it may not be noticed that the installation place is not always a preferable place for recording and reproducing.

Similarly, even when the disc itself has many stains or scratches, the recording or reproducing operation can be performed correctly as a result. You may not notice it.

However, even if such a protection function is added, if the apparatus is basically used in a place where there is a lot of vibration, or if a recording or reproducing operation is performed on a disc with many scratches or dirt, When a vibration larger than usual is accidentally added, there is a possibility that the protection function against the vibration may not be able to be performed because the memory has a small margin. That is, in this case, if a slightly stronger vibration or the like than usual is added, a correct recording or reproducing operation cannot be immediately performed.

The present invention has been made in view of such a situation, and is intended to inform a user of a memory use state.

[0014]

According to a first aspect of the present invention, there is provided a reproducing apparatus for reproducing a digital signal compressed and recorded on a recording medium in advance, and temporarily reproducing the digital signal reproduced by the reproducing means. A storage means for storing the digital signal stored in the storage means, a decompression means for expanding the signal, and a storage amount of the digital signal stored in the storage means when the storage amount becomes equal to or more than a predetermined amount. Warning presenting means for presenting a warning.

The warning presenting means, when the accumulated amount of the digital signal stored in the storage means reaches the first value,
A first warning may be presented.

The warning presenting means, when the accumulated amount of the digital signal stored in the storage means reaches the second value,
A second warning may be presented.

According to the first aspect of the present invention, a digital signal that has been compressed and recorded on a recording medium is reproduced, and the reproduced digital signal is temporarily stored. If the accumulated amount is equal to or more than a predetermined amount, a warning is presented.

[0018]

FIG. 1 is a block diagram showing the configuration of an embodiment of a mini disk device (magneto-optical disk device) to which the information reproducing apparatus of the present invention is applied. Cartridge 1
Contains a disk (magneto-optical disk) 2 which is rotated at a predetermined speed by a spindle motor 3. An optical pickup 5 having an objective lens 4 is disposed below the disk 2, and a recording magnetic head 6 is disposed at a position opposite to the optical pickup 5. The optical pickup 5 and the recording magnetic head 6
Is moved to a predetermined position in the radial direction of the disk 2 by the feed motor 7.

The A / D converter 8 A / D converts an audio signal supplied from a circuit (not shown) into a digital signal of 16 bits per sample, and supplies the digital signal to the compression / expansion unit 10. . The D / A converter 9 converts the digital signal supplied from the compression / expansion unit 10 in units of 16 bits into a digital signal and outputs the digital signal to a circuit (not shown). The compression / decompression device 10 includes an A / D converter 8
The input digital signal is compressed and output to the memory controller 11 while the memory controller 1
The digital signal supplied from 1 is expanded and output to the D / A converter 9.

In the recording mode, the memory controller 11 transmits a signal supplied from the compression / expansion unit 10 to the DRAM 12
, And once stored, read out the signal stored therein and supply it to the encoder / decoder 13 of EFM and CIRC. In the reproduction mode, the signal supplied from the encoder / decoder 13 is supplied to the DRAM 12 for storage, and the signal stored therein is read out.
To be supplied.

The encoder / decoder 13 refers to the signal supplied from the address decoder 15 and demodulates the signal supplied from the optical pickup 5 via the RF amplifier 16 to record at the recording point (or reproduction point) of the disk 2. Is read and output to the system controller 18. In the recording mode, a signal input via the memory controller 11 is EFM-modulated, and an error detection and correction code is added.
To the recording magnetic head 6. In the reproduction mode, the RF amplifier 16
The supplied signal is subjected to EFM demodulation, error detection and correction processing, and then output to the memory controller 11.

The servo control circuit 17 is controlled by the system controller 18 to rotate the spindle motor 3 at a predetermined speed and to control the optical pickup 5 and the recording magnetic head 6 via the feed motor 7 in the radial direction of the disk 2. To be transported. Further, the optical pickup 5 is controlled to irradiate the disk 2 with laser light.

The keys 19 are operated when various commands are input to the system controller 18. The display unit 20 is controlled by the system controller 18 and displays predetermined information.

Next, the operation will be described. In the recording mode, the audio signal that has been A / D converted by the A / D converter 8 is input to the compression / decompression device 10 and compressed.
The compressed signal is supplied to the DRAM 12 via the memory controller 11 and is temporarily stored. This DR
The AM 12 has a storage capacity of 4 Mbits, and is capable of temporarily storing audio signals for about 8 seconds in real time.

The signal stored in the DRAM 12 is read out by the memory controller 11 at a predetermined timing, supplied to the encoder / decoder 13, encoded, and then supplied to the recording magnetic head 6 via the head drive circuit 14. Is done. At this time, laser light is emitted from the optical pickup 5 to the disk 2 via the objective lens 4. As a result, a signal corresponding to the recording signal is magneto-optically recorded on the disk 2.

On the other hand, in the reproduction mode, the optical pickup 5
Irradiates the disk 2 with laser light and outputs a signal corresponding to a recording signal from the reflected light. This signal is supplied to the encoder / decoder 13 via the RF amplifier 16. The encoder / decoder 13 decodes the input signal and sends the decoded signal to the DRAM 1 via the memory controller 11.
2 temporarily. The signal stored in the DRAM 12 is read out at a predetermined timing and supplied to the compression / expansion unit 10 via the memory controller 11. The compression / decompression device 10 decompresses the input signal and outputs the signal to the D / A converter 9. The D / A converter 9 converts the input signal into a D / A
The data is converted and output to a speaker (not shown), for example.

In the recording mode and the reproduction mode, once data is stored in the DRAM 12, it is impossible to record or reproduce a signal on the disk 2 in real time due to, for example, external vibration. Even in such a case, by temporarily storing the signal in the DRAM 12, it is possible to execute recording or reproduction again after the vibration is canceled. As a result, the recording signal or the reproduction signal is prevented from being partially lost.

Next, the display operation of the display unit 20 will be described with reference to the flowchart of FIG.

First, in step S1, the apparatus waits until the recording operation is started, and operates the key 19, for example.
When a recording operation is instructed to the system controller 18 and the system controller 18 starts the recording operation, the process proceeds from step S1 to step S2. In step S2, the process waits until data for one cluster (for 32 sectors) is stored in the DRAM 12, for example. That is, after the recording signal is A / D converted by the A / D converter 8 and compressed by the compression / expansion unit 10, the memory controller 11
Is supplied to the DRAM 12 through the memory and stored. The process waits until the storage amount reaches one cluster.

When it is determined in step S2 that one cluster of data has been stored in the DRAM 12, the process proceeds from step S2 to step S3, and writing of one cluster of data is started. That is, at this time, DR
The data stored in the AM 12 is stored in the memory controller 11
And supplied to the encoder / decoder 13 to be encoded. Then, the encoded data is supplied to the recording magnetic head 6 via the head drive circuit 14 and recorded on the disk 2.

When this writing is started, step S
Until the writing of data for one cluster is completed by the processing of 4 to S7, it is determined whether or not an abnormality has occurred.

In this embodiment, the presence or absence of three types of abnormalities is determined in steps S4 to S6. In step S4, it is determined whether an error has occurred in four consecutive sectors in the address signal (ADIP signal) recorded by meandering the track (pregroove) described with reference to FIG. To determine whether an error has occurred four times consecutively). 4
When an error occurs consecutively, it is determined that there is an abnormality. This determination is made by the system controller 18 counting the number of signals that the encoder / decoder 13 outputs each time an error occurs in the ADIP signal.

In step S5, when there is no special command from the system controller 18, when a track jump occurs, it is determined that there is an abnormality.
The servo control circuit 17 monitors a tracking error signal output from the optical pickup 5 and, when a signal at which a recording point crosses a track two or more times within a predetermined time (for example, 2 ms) is detected, a track jump is generated. And outputs an abnormality detection signal to the system controller 18.

In step S6, when it is determined that the servo of the spindle motor 3 for rotating and driving the disk 2 at a constant linear velocity (CLV) has been deviated, it is determined that there is an abnormality. The servo control circuit 17 drives the spindle motor 3 to rotate at a predetermined linear velocity set in advance. For this drive, the servo control circuit 17
Built-in LL circuit. The servo control circuit 17 outputs an abnormal detection signal to the system controller 18 when the servo of the PLL circuit is released.

The above three abnormalities do not occur when abnormal vibration is applied from the outside or when the disk 2 does not have relatively large scratches or stains. In other words, the occurrence of these abnormalities indicates that abnormal vibrations are given from the outside or that the disk 2 has large scratches or dirt.

Therefore, when these abnormalities are detected, the process proceeds from steps S4 to S6 to step S8, and it is determined whether or not the data storage amount in the DRAM 12 is full. Since the DRAM 12 has a storage capacity of 4 Mbits, when converted to real time,
An audio signal having a length of about 8 seconds can be stored. In step S8, the data storage amount is
When it is determined that the storage capacity does not exceed the storage capacity of No. 12, the process proceeds from step S8 to S9, and the character of Retry is displayed on the display unit 20.

That is, the system controller 18
Encoder / decoder 13 or servo control circuit 17
Is monitored, and when an abnormality detection signal is input, for example, a Retry as shown in FIG.
Is displayed on the display unit 20 for a predetermined time (for example, 3 seconds). The user can see from this display that the writing operation has been performed again for some reason.

Then, after step S9, step S1
The process proceeds to 0, and the writing operation is performed again. That is, when an abnormality is detected, data cannot be correctly recorded on the disk 2. Therefore, the system controller 18 sets a mode in which writing of one cluster of data stored in the DRAM 12 is executed again. . Then, the process returns from step S10 to S3, and rewriting of data of the same cluster is started.

On the other hand, in step S8, the DRAM 1
When it is determined that the storage amount of No. 2 is full,
Proceeding from step S8 to step S11, the Retry
Error characters are displayed. That is, at this time, the system controller 18 causes the display unit 20 to display the character of Retry Error for a predetermined time (for example, three seconds) as shown in FIG. This allows the user to know that the correct data could not be written, and that the audio signal being recorded was interrupted halfway.

After step S11, the process proceeds to step S12, where the data for one cluster stored in the DRAM 12 is discarded, and the next data is fetched. That is, now DRA
Since data is recorded to the full capacity of M12, if the recording of data of one cluster which has failed to be written to the disk 2 is to be performed again, the data input one after another in real time will be lost. It cannot be taken into the DRAM 12.

Therefore, when an error occurs, the data of the cluster which was being written is given up, and the data supplied to the DRAM 12 via the compression / expansion unit 10 is stored. That is, the DRAM 1
2 has a FIFO structure, old data is discharged, and new data is sequentially written. Then, step S1
After step 2, the process returns to step S3, and writing of a new cluster is started.

The abnormality detection in steps S4 to S6 is repeated until it is determined in step S7 that writing for one cluster has been completed. If it is determined in step S7 that the writing of data for one cluster has been completed, the process proceeds from step S7 to step S1.
Proceeding to 3, it is determined whether the end of the recording operation has been instructed. If the end of the recording operation has not been instructed, the process returns from step S13 to step S2, and the process of writing the next one cluster of data is repeatedly executed in the same manner as in the above-described case. In step S13, when it is determined that the end of the recording operation is instructed by operating a predetermined key 19 or the like, the recording operation is ended.

FIG. 5 schematically shows the relationship between the storage capacity of the DRAM 12 and the display. As shown in FIG.
M12 is capable of storing audio data for 8 seconds as a storage capacity. 3 as described above
If none of the two abnormalities occur, the DRA
A predetermined amount (for one cluster) of recording data is supplied to the M12 from the compression / expansion unit 10 and written. The data is read out at a predetermined timing and written to the disk 2. Therefore, in this case, the amount of data stored in the DRAM 12 is less than or equal to approximately one cluster (approximately 2 seconds in terms of reproduction time). When the storage amount of the DRAM 12 is equal to or less than this one cluster, no special display (warning) is performed.

On the other hand, if any abnormality occurs, the storage amount of the DRAM 12 becomes one cluster or more. At this time, the character “Retry” is displayed as described above. However, during the period when this character is displayed,
Since there is free space left in the RAM 12 for storing data, even if data is rewritten to the disk 2, the sequentially input data is stored in the DRAM 1.
2 can be temporarily stored.

On the other hand, in the case where data for 8 seconds is stored in the DRAM 12, if rewriting is performed on the disk 2, new data that is sequentially input may be held in the DRAM 12. become unable. Therefore, in such a case, Retry Erro
The character r is displayed to warn the user that the sound being written is interrupted halfway.

It should be noted that, in the above, in the recording mode, D
Although the display corresponding to the storage amount of the RAM 12 is performed, the same display can be performed during reproduction.

In the above embodiment, the display unit 2
Although a warning is issued by displaying characters at 0, it is also possible to generate a warning by sound, for example.

[0048]

As described above, according to the reproducing apparatus of the first aspect, the digital signal compressed and recorded on the recording medium in advance is reproduced, and the reproduced digital signal is temporarily stored. , The amount of stored digital signal is
When the volume exceeds a specified amount, a warning is presented.Install the device in a place with a lot of vibration, and promptly warn the user when the recording medium is very dusty or dirty. Can be. When receiving this warning, the user can change the installation location of the device or change the recording medium as necessary, so that the recording signal or the reproduction signal may be interrupted halfway. It is possible to suppress a situation from occurring.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a mini disc apparatus to which a reproducing apparatus of the present invention is applied.

FIG. 2 is a flowchart illustrating a display operation of a display unit 20 of FIG.

FIG. 3 is a diagram illustrating a display unit 20 of FIG.

FIG. 4 is a diagram illustrating another example of the display unit 20 of FIG.

FIG. 5 is a diagram illustrating a relationship between a storage amount and a display of a DRAM 12 in FIG. 1;

FIG. 6 is a diagram illustrating a recording format of a conventional mini-disc.

FIG. 7 is a diagram for explaining the principle of address recording on a conventional mini-disc.

FIG. 8 is a diagram illustrating a more detailed recording format of a conventional mini-disc.

[Explanation of symbols]

1 cartridge, 2 disks, 4 objective lens, 5 optical pickup, 6 magnetic head for recording,
8 A / D converter, 9 D / A converter, 10 compression / decompression device, 11 memory controller, 12 DR
AM, 13 encoder / decoder, 17 servo control circuit, 18 system controller 19 key,
20 Display

Claims (3)

[Claims] 1. A reproducing means for reproducing a digital signal compressed and recorded in a recording medium in advance, a storing means for temporarily storing the digital signal reproduced by the reproducing means, and a storing means for the storing means Expanding means for reading out the digital signal obtained and expanding the signal; and a warning presenting means for presenting a warning when the accumulated amount of the digital signal stored in the storage means is equal to or more than a predetermined amount. A playback device comprising: 2. The method according to claim 1, wherein the warning presenting means presents a first warning when the accumulated amount of the digital signal stored in the storage means reaches a first value. A playback device according to claim 1. 3. The method according to claim 1, wherein the warning presenting means presents a second warning when the accumulated amount of the digital signal stored in the storage means reaches a second value. A playback device according to claim 1.