JP2000057754A - Playback device - Google Patents

Abstract

(57) [Problem] To provide a disk changer system capable of identifying each recording medium immediately after power-on even if power is turned off after system initialization. In addition, even when the disk needs to be replaced, the disk specified by the user is immediately and continuously played back from the head without interruption, and after the system is initialized, a certain recording medium is removed from the system. When the data is taken out and reset in the system, initialization is performed again so that it is not necessary to read the head data from the recording medium. SOLUTION: At the time of system initialization, TOC information is read from each of the disks 1a to 1e, stored in a TOC memory area of a RAM 12, and disk identification information among them is stored in an EEPROM 16 as a nonvolatile memory. The head data is read from 1a to 1e and stored in the head memory area of the RAM 12. The disk identification information stored in the EEPROM 16 is stored in the dot matrix LED 1 according to a user's instruction.
7 is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can store a plurality of recording media such as an MD (mini-disc) and a CD (compact disc) on which information such as music is recorded. And a playback device such as an MD changer system or a CD changer system, which can select and play back.

[0002]

2. Description of the Related Art An MD changer system and a C-changer system capable of accommodating a plurality of disks such as MDs and CDs and selecting and reproducing an arbitrary disk from the plurality of disks.
Disc changer systems such as the D changer system have been put to practical use.

In addition, operability is improved by sequentially writing digital data read from a disk on which music data is recorded as digital data to a memory such as a RAM (random access memory), and reading and outputting the digital data from the memory. Methods are also being considered.

[0004]

However, in the above-described disk changer system, when the disk is replaced at the request of the user, the disk is actually replaced,
By the time the disc specified by the user is played, a maximum of 1
It takes a long time of about 0 seconds, during which time the silent state continues, giving the user discomfort.

Therefore, in such a disc changer system, even when the disc needs to be replaced, a method in which the disc specified by the user is immediately and continuously reproduced from the head without any interruption in sound is considered. I have.

In this method, a memory (hereinafter referred to as a head) for storing head data of a disk is provided separately from a memory (hereinafter referred to as a main memory area) for sequentially writing and reading data read from the disk as described above. Memory area), the head data area of each disc is stored in advance in the head memory area, and when playing the disc specified by the user, first, from the head memory area, Reads and outputs the head data of the disk specified by the user, exchanges the disk, reads data after the head data from the disk specified by the user, writes the data in the main memory area, and reads the data from the head memory area. After reading all the data, the data after the head data is read from the main memory area and output. It is.

However, the main memory area and the head memory area may be separate areas of one memory, or may be separate memories.

According to the above-mentioned method, even when the disk needs to be replaced, the disk specified by the user is immediately and continuously reproduced from the head without interruption.

Regardless of whether or not the system is capable of realizing such instantaneous continuous reproduction, the disk changer system reads disk management information recorded on the disk to identify each disk. At the same time, the disk management information is written into the buffer memory and used for disk access or the like.

[0010] However, after the disk management information is read from the disk and written into the buffer memory as described above, if the power supply of the system is turned off, then, when the power supply is turned on again, the disk management information is read from the disk again. Otherwise, there is a problem that each disk cannot be identified.

An object of the present invention is to provide a reproducing apparatus that can store a plurality of recording media, such as a disc changer system, and mounts a selected recording medium at a predetermined position for reproduction. If the management information is read from the respective recording media, the respective recording media can be read even if the power of the apparatus is turned off or the power is turned on again without reading the management information from the respective recording media again. Is to be able to identify.

As described above, by storing the head data in the memory in advance, even when the disk needs to be replaced, the disk specified by the user can be immediately and continuously transmitted from the head without interruption. Can be played.

However, in a disc changer system capable of realizing such instantaneous continuous reproduction, after the head data of each disc is stored in the memory by system initialization, the user checks the label on the disc, for example. For example, if you eject a disc from the system by mistake or press the disc eject button and then re-insert the same disc into the system, the head data of the re-set disc is stored in memory. Nevertheless, the system is unable to determine if the re-set disc is the same as the one from which it was removed, and the data at the beginning is a disc stored in memory. To read the top data from the re-set disk. Must be stored in the memory taken, there is a problem that requires a waste of time and power.

When the system power is turned off after the head data of each disk is stored in the memory by system initialization, the head data is stored in the memory when the power is turned on again. If the memory is capable of holding data even after the power is turned off, and the head data of each disk is held in the memory, the system will not be able to store the head data of each disk in the memory. Is unable to determine whether the disk is an empty disk or not, it is necessary to read the head data from each disk and store it in the memory by initialization again, which is a waste of time and power. There is.

Therefore, another object of the present invention is to store the head data in a memory in advance, so that even if the disk needs to be replaced, the disk specified by the user can immediately output sound from the head. In a playback device such as a disc changer system that is continuously played back without interruption, after the head data of a recording medium is once stored in a memory by initialization of the device,
When the recording medium is removed from the device and then reset in the device, or when the power of the device is turned off,
When the power is re-input, it is not necessary to read the head part data from the recording medium and store it in the memory by initializing again, so that useless time and power can be saved.

[0016]

According to a first aspect of the present invention, there is provided a reproducing apparatus capable of storing a plurality of recording media and mounting a selected one of the recording media at a predetermined position and reproducing the information. And a non-volatile information storage means for storing

According to a second aspect of the present invention, in a reproducing apparatus capable of storing a plurality of recording media, of which a selected recording medium is mounted at a predetermined position and reproducing the data, a main memory in which data read from the recording media is sequentially written. Means, sub-storage means for storing head data of each recording medium, and information storage means for storing management information of each recording medium, and at the time of reproduction, the corresponding head data is read from the sub-storage means. While reading and outputting, the data after the head part data is read from the corresponding recording medium, written into the main storage means, and read and output from the main storage means, thereby reproducing the indicated recording medium, and When the recording medium is set in the device after the recording medium is removed from the device, the management information recorded in the set recording medium is set. And the management information of the taken-out recording medium stored in the information storage means is compared to determine whether the set recording medium is the same as the taken-out recording medium. , Characterized in that.

In the reproducing apparatus of the first invention configured as described above, once the management information is read from each recording medium and stored in the information storage means, even if the power of the apparatus is cut off thereafter, When the power is turned on again, each recording medium can be identified from the management information held in the information storage unit without reading the management information from each recording medium again.

In the reproducing apparatus according to the second aspect of the present invention, after the head data of the recording medium is once stored in the secondary storage means by the initialization of the apparatus, the recording medium is taken out of the apparatus. After that, when the apparatus is reset, it is not necessary to read the head data from the recording medium and store it in the sub-storage means by initialization again, so that wasteful time and power can be saved.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described for the case where the present invention is applied to an MD changer system.

[Basic Configuration of System] FIG. 1 shows the functional configuration of the MD changer system of this embodiment.

The MD changer system of this embodiment is roughly divided into a disk box 31 capable of storing, for example, five disks 1a to 1e, and one of the disks 1 (in FIG. 1, the disk 1a is used as the disk 1a). A player box 32 for playing the disk 1a in the box 31 (shown by a broken line);
A stage controller 33 and a loading controller 34 for moving the disc between the player box 32 and the player box 32.

The stage controller 33 mounts any disc in the disc box 31 on the player box 32 according to an instruction from the system controller 11 constituted by, for example, a microcomputer in the player box 32, and
Disk 1 mounted on disk 2
The loading controller 34 determines which stage to return to, and according to the determination of the stage controller 33, loads the disc into the player box 32, removes the disc from the player box 32, and returns the disc to the disc box 31. However, a mechanism such as a loading motor, which is omitted in the drawing, is controlled.

A disk 1 which is a MD and is a magneto-optical disk mounted on a predetermined position of the player box 32
Is driven by a spindle motor 2 to irradiate the disk 1 from the optical head 3 with high-level laser light for heating the recording track to the Curie temperature during recording, and from the optical head 3 during reproduction with the laser.
Is irradiated with a relatively low level laser beam for reading information from the reflected light by the magnetic Kerr effect.

The optical head 3 includes, in addition to a laser diode for outputting laser light, an optical system including an objective lens 3a and a polarizing beam splitter, a two-axis actuator 4,
And a light detector for detecting light reflected from the disk 1.

The objective lens 3a includes a biaxial actuator 4
Accordingly, the disk 1 can be moved in the radial direction and in a direction approaching the disk 1 or moving away from the disk 1. Further, the entire optical head 3 includes a thread mechanism 5
Thereby, the disk 1 can be moved in the radial direction.

Although not shown in the figure, a magnetic head for applying a magnetic field modulated by data to the disk 1 during recording is disposed at a position facing the optical head 3 with the disk 1 interposed therebetween. However, since the present invention does not directly relate to the recording, the description of the recording is omitted hereafter.

At the time of reproduction, information read from the disk 1 by the optical head 3 is supplied to the RF amplifier 7, and the RF amplifier 7 performs arithmetic processing on the information.
Thus, a reproduction RF signal, a tracking error signal, a focus error signal, groove information (absolute position information recorded as a pre-groove (wobbling groove) on the disk 1), and the like are obtained.

The groove information from the RF amplifier 7 is decoded by the address decoder 10, and the absolute position information is obtained from the address decoder 10. Further, address information recorded on the disc 1 as data is extracted by the RF decoder 8. These absolute position information and address information are supplied to the system controller 11,
Used for various controls.

A tracking error signal and a focus error signal from the RF amplifier 7 are supplied to a servo circuit 9 together with a track jump command, an access command, rotation speed detection information, and the like from the system controller 11, and various types of signals are sent from the servo circuit 9. Is obtained, the two-axis actuator 4 is controlled by the servo control signal to perform tracking control and focus control, and the sled mechanism 5 is controlled to move the optical head 3 in the radial direction of the disk 1. At the same time, the rotation of the spindle motor 2 is controlled so that the disk 1 rotates at a constant linear speed.

The reproduced RF signal from the RF amplifier 7 is RF
The decoder 8 performs processing such as EFM demodulation and CIRC decoding, and outputs the disk data output 20 after the processing.
The data is slightly adjusted by the system controller 11 and obtained as a memory data input 21 from the system controller 11.

This memory data input 21 is written into the RAM 12 by the system controller 11 as described later. The memory data input 21 written in the RAM 12 is read out by the system controller 11 as a memory data output 22 from the RAM 12 as described later, and is slightly adjusted by the system controller 11. The data is supplied to the decoder 13.

The audio decoder 13 performs a process such as inverse orthogonal transformation of the audio decoder input 23 and data expansion, and obtains a linear audio output 24. This linear audio output 24 is converted into an analog audio signal 25 by the D / A converter 14, and the analog audio signal 25 is output to the audio output terminal 15.
Is derived.

[Memory and Display Means] FIG.
12 shows an example. In this example, the RAM 12 is configured as a non-volatile memory,
It has memory addresses up to FFFF, of which 00
An address area from 000 to 7FFFF is set as the main memory area 12M, and an address area from 80000 to FFFFF is set as the head memory area 12S.

The main memory area 12M further contains 000
T, which will be described later, of the address area from 00 to 0FFFF
A TOC memory area 12M1 in which OC (Table Of Contents) information is stored and a disk memory area 12M2 in which data after the head data in an address area from 10000 to 4FFFF are stored.

Under the control of the system controller 11, the memory data input 21 is stored in the disk memory area 12M2 while the last input address in the past is incremented. As a result, the input address becomes 4FFF.
When it reaches F, the next returns to the lower order and the address 100
This is a so-called ring buffer configuration in which data is stored continuously from 00.

In the course of the accumulation, the memory data input 21
When the input address reaches the output address of the memory data output 22, the system controller 11 stops accumulating data in the disk memory area 12M2. Then, the memory data output 22 is read by the system controller 11 from the area 12M3 in which the data is stored in the disk memory area 12M2, while the output address is incremented from the lower order.

In the case of MD, the memory data output 22 is incremented at a rate of 1/4 or less of the memory data input 21. Therefore, even if an error occurs in the reproduction data due to an external impact or the like, the music can be reproduced for a certain period of time by using the data stored in the storage area 12M3, and the error can be recovered during that time. By doing so, continuous reproduction can be guaranteed.

T stored in TOC memory area 12M1
The OC information includes disc management information such as a title of each of the discs 1a to 1e, a title of a song recorded on each of the discs 1a to 1e, an artist name, a performance time, a recording date and time, and an address recorded on the disc. Then, as described later, at system initialization,
TOC read from each disk 1a-1e
It is stored in the memory area 12M1 and is used by the system controller 11 for disk access or the like.

Further, in this embodiment, an EEPROM 16 is provided as a non-volatile memory separately from the RAM 12, and the TOC information is stored in the TOC memory area 12 as described above.
When stored in M1 or in TOC memory area 12M
At an appropriate timing after being stored in
Of the OC information, information for identifying the disc, for example, disc title information is stored in the EEPROM 16.

Further, in this embodiment, a dot matrix LED 17 is provided as a text display element. As will be described later, when a user searches for a target disk, the disk identification information of the disk specified by the user, for example, the disk Title information is EEPROM
16 and the dot matrix LED 1
7 is displayed.

[System Initialization] In the MD changer system of this embodiment, the TOC information of the disks 1a to 1e is stored at the time of system initialization such as when the system is powered on immediately after the disks 1a to 1e are stored in the system. T
The disk identification information is stored in the OC memory area 12M1, the disk identification information is stored in the EEPROM 16, and the head data Da to D are stored.
e is stored in the head memory area 12S.

The order of disks for storing head data and the like can be arbitrarily set in the system.
In the following, a case where head data and the like are stored in the order of the disks 1a, 1b, 1c, 1d, and 1e will be described as an example.

First, the system controller 11 includes a stage controller 33 and a loading controller 34.
The first disk 1a is mounted on the player box 32 by controlling the operations described above.

After loading the disc 1a at a predetermined position on the player box 32, the system controller 11
First, a portion of the innermost portion of the disc 1a where the TOC information is recorded is accessed, and the TOC information of the disc 1a is accessed.
C information is read and written into the TOC memory area 12M1, and disc identification information, for example, disc title information of the TOC information is written in the EEPROM 16
Write to.

Next, the system controller 11 detects, from the TOC information, an address where the head data Da of the disk 1a is recorded, accesses the address, and reads the head data Da of the disk 1a. The start address 8000 is stored in the address area 12Sa corresponding to the disk 1a in the head memory area 12S.
Store from 0.

Access to TOC information recording part, TO
For writing the C information, writing the disc identification information, and accessing the recording address of the head data Da,
It takes about one second, and it takes about four seconds to store the head data Da.

After storing all the head data Da of the disk 1a, the system controller 11 first controls the loading controller 34 to remove the disk 1a from the player box 32, Return the box 31 to its original position. The time required for this is about 1 second.

Next, the system controller 11 controls the stage controller 33 so that the disk box 3
1 is moved by one stage in this case. The time required for this is 4-5 seconds.

Next, the system controller 11 controls the loading controller 34 to mount the disc 1b from the disc box 31 to the player box 32. The time required for this is about 1 second.

In this way, the next disc 1b is mounted at a predetermined position of the player box 32. The time required for this is 6-7 seconds.

Thereafter, as in the case of the first disk 1a, the system controller 11
The C information is read and written into the TOC memory area 12M1, and the disc identification information of the TOC information is replaced with E.
The data is written into the EPROM 16, the head data Db of the disk 1b is read, and the data is stored from the head address 90000 in the address area 12Sb corresponding to the disk 1b in the head memory area 12S.

Thereafter, the same processing is performed to disc 1
The TOC information of c, 1d, 1e is stored in the TOC memory area 12M.
1, the disc identification information is written into the EEPROM 16, and the head data Dc, Dd, De are stored in the address areas 12Sc, 12Sd, 1 in the head memory area 12S.
It is stored in 2Se, and the system initialization ends.

Each of the address areas 12Sa to 12Se is 3.2 Mbits, and in the case of MD, this corresponds to about 14 seconds of reproduction output time.
Each of Sa to 12Se stores head data Da to De for approximately 14 seconds in reproduction output time.

[Reproduction after Initialization] In the system in which the above-mentioned initialization has been completed, even when the disk needs to be replaced, the disk specified by the user is immediately transmitted from the head.
Sound is played continuously without interruption. Disc 1
As an example, a case where the user instructs reproduction of the disc 1b while reproducing a is being performed. The display of the disc identification information will be described later.

In this case, at the time of the user's selection operation, since the disc 1a is mounted on the player box 32 and the disc 1a is being reproduced, the main memory area 12M
In the storage area 12M3, the latest data of the disk 1a is stored.

When the disk 1b is selected in this state, the system controller 11 sets the memory data output 2
The output address of the address area 12Sb in the head memory area 12S where the head data Db of the disk 1b is stored is calculated from the last read address of the memory data output 22 in the storage area 12M3.
0000 and the head data Db of the disk 1b
Is read.

The read head data Db is processed by the audio decoder 13 as an audio decoder input 23, and is further converted into an analog audio signal 25 by the D / A converter 14.

Therefore, immediately after the user's selection operation, the head of the disc 1b specified by the user is reproduced. The head data Db is approximately 14 hours in reproduction output time.
Since the time is seconds, the head is reproduced without interruption for about 14 seconds.

At the same time, the system controller 1
First, 1 controls the loading controller 34, removes the disc 1a mounted on the player box 32 at this time from the player box 32, and returns the disc 1a to the original position of the disc box 31. The time required for this is about 1 second.

Next, the system controller 11 controls the stage controller 33 so that the disk box 3
1 is moved by one stage in this case. The time required for this is 4-5 seconds.

Next, the system controller 11 controls the loading controller 34 to mount the disc 1b from the disc box 31 to the player box 32. The time required for this is about 1 second.

In this way, the disc 1b designated by the user is mounted on the player box 32 at a predetermined position. The time required for this is 6-7 seconds.

Thereafter, the system controller 11 sets the TOC memory area 12M1
Is calculated from the TOC information stored in the disk 1b, which is a continuation address of the head data Db of the disk 1b, and is offset by 10,000 from the disk head position, and the optical head 3 is made to access the position. The time required for this is about 1 second.

After the access is completed, the system controller 1
1 stores data from the accessed address position, that is, data after the head data Db of the disk 1b, in the disk memory area 12M2 at the head address 1000b.
Store from 0.

At this time, since the time is within 14 seconds from the time of the user's selection operation, the head data Db of the disk 1b is still read from the address area 12Sb of the head memory area 12S.

Then, from the time of the user's selection operation, about 1
Four seconds later, when all the head data Db has been read, the system controller 11 sets the output address of the memory data output 22 to the final address 9FF of the address area 12Sb.
FF to the start address 10000 of the disk memory area 12M2 and change the start data D of the disk 1b.
The data after b is read.

The data after the read head data Db is processed by the audio decoder 13 as an audio decoder input 23, and is further converted into an analog audio signal 25 by the D / A converter 14.

Therefore, the disc 1 designated by the user
From the beginning of b to the subsequent part, the sound is continuously reproduced without interruption. Subsequent processing is the same as that of the system in which the head data is not stored in the memory.

After the user selects the disk 1b, the head data Db of the disk 1b is read from the address area 12Sb.
When another disk, for example, the disk 1c is selected during about 14 seconds until all the data is output, the system controller 11 determines the output address of the memory data output 22 from the address in the middle of the address area 12Sb. The head data Dc of the disk 1c is read by changing the head address A0000 of the address area 12Sc where the head data Dc of the disk 1c is stored.

Thereafter, mounting the disk 1c in the player box 32, reading the data after the head data Dc from the disk 1c, writing the data into the disk memory area 12M2, and reading from the disk memory area 12M2 means selecting the disk 1b. Same as when. Therefore, immediately after the user selects another disc 1c, the other disc 1c is continuously and continuously reproduced from the head without interruption.

[Disc Identification at Power-On and After Power-On]
As described above, after the disk identification information of each of the disks 1a to 1e, for example, the disk title information is held in the EEPROM 16 by the system initialization, the power is turned on again even if the system is turned off. Then, by initializing again, each disk 1a-1e can be identified as follows without reading TOC information from each disk 1a-1e.

A case where the power of the system is turned off after the system is initialized, and then the power is turned on again and the user searches for a target disk is shown. First, assuming that the user instructs the disk of the stage 1, the system controller 11 reads the disk title information of the disk 1a from the EEPROM 16 and outputs the dot matrix LED.
17 displays the disc title of the disc 1a.

The user looks at the disc title,
When it is determined that the disk is not the target disk, the next stage 2 disk is specified. As a result, the system controller 11
The disc title information of the disc 1b is read from M16, and the disc title of the disc 1b is displayed on the dot matrix LED17.

The user looks at the disc title,
If it is determined that the disk is not the target disk, the next stage 3 disk is instructed. If it is determined that the disk is the target disk,
Thereafter, the instruction of the disc is stopped. In this way, the user can search for the target disc.

In this case, as one method, the system controller 11 immediately reads the head data of the specified disk from the head memory area 12S and reproduces the head, every time there is a disk instruction from the user. At the same time, a disk swap operation to the specified disk is started.

Alternatively, as another method, even if a disk instruction is given from the user, the system controller 11 does not immediately read the head data of the specified disk from the head memory area 12S, and If the user does not start the disk exchange operation, and within a certain period of time of about 2 to 3 seconds from the user's disk instruction, and if there is no disk instruction from the user, the disk specified by the immediately preceding disk instruction is the target disk. It is determined that there is, after a lapse of a predetermined time, the head data of the target disk is read from the head memory area 12S, the head is reproduced, and the disk exchange operation for the target disk is started. Then, the target disc is mounted on the player box 32, and the data after the head data from the target disc is loaded. Reading a write to disk memory area 12 m @ 2, to read out from the disk memory area 12 m @ 2.

Alternatively, as another method, the system controller 11 immediately reads the head data of the specified disk from the head memory area 12S and reproduces the head every time there is a disk instruction from the user. However, the disk exchange operation to the specified disk does not start, and within a certain period of time described below from the user's disk instruction, and when there is no further disk instruction from the user, the disk specified by the immediately preceding disk instruction becomes the target disk. The disc is determined to be a disc, and after a lapse of a predetermined time, a disc exchange operation for the target disc is started, the target disc is mounted in the player box 32, and the data after the head data is read from the target disc. Write to the disk memory area 12M2 and read from the disk memory area 12M2 Unisuru.

In this case, in the specific example, the head memory area 12 is set so that the target disk is immediately and continuously reproduced from the head without interruption.
From about 14 seconds, which is the playback output time of the head data stored in S, the disc mounted in the player box 32 at that time is returned to the original position of the disc box 31, and the target disc is transferred to the player box 32. It is set to about 3 seconds by subtracting the maximum time of about 11 seconds required for disc replacement by reading the data after the head part data from the target disk after mounting.

In the latter two methods, when a user searches for a target disk, useless disk replacement operation can be omitted, and power consumption and mechanical operation noise can be reduced.

As described above, each of the disks 1a to 1a
By storing the disc identification information 1e, for example, the disc title information in the EEPROM 16 which is a non-volatile memory, even if the power of the system is turned off, when the power is turned on again, the user can immediately operate the respective discs. The titles of 1a to 1e can be confirmed,
Each of the disks 1a to 1e can be identified.

[Ejecting and setting the disk after initialization]
In the MD changer system of the above-described embodiment, even if the user removes a certain disk from the disk box 31 after system initialization, the TOC information of the disk is still stored in the TOC memory area 12M1, and the head data is It remains stored in the head memory area 12S.

When the user removes a certain disk from the disk box 31 and then sets the same disk again on the same stage of the disk box 31 or sets another disk, the system controller 11 As described below, it is determined whether or not the reset or set disc is the same as the removed disc, and the head data of the reset or set disc is processed.

The same disk may be reset when the user removes a disk from the disk box 31 in order to confirm the label on the disk or accidentally presses the disk eject button.

The disk 1b of the stage 2 is taken out,
As an example, a case where the same disk is reset or another disk is set as the disk 1b will be described.

The system controller 11 first removes the disc mounted on the player box 32 from the player box 32 and returns the disc box 31 to its original position.
Is moved from the disc box 31 to a position where the disc 1b can be taken out of the player box 32 without moving the disc box 31, and then the re-set or set disc 1b is
The disc box 31 is mounted on the player box 32.

Next, the system controller 11 reads the TOC information from the reset or set disk 1b, and temporarily writes the TOC information in a free area of the main memory area 12M.

Thereafter, the system controller 11
The TOC information of the taken out disk (1b) is read from the OC memory area 12M1, the disc identification information, for example, the disc title information is extracted, and the reset or set disc 1b of the disc (1b) is extracted from the main memory area 12M. The TOC information is read, disc identification information such as disc title information is extracted, and both disc identification information such as disc title information are compared.

As a result of the comparison, when they match, the system controller 11 replaces the re-set or set disc 1b with the ejected disc (1
b), the TOC information of the removed disk (1b) stored in the TOC memory area 12M1 is then replaced with the newly set disk 1b.
And the head data (Db) of the extracted disk (1b) stored in the address area 12Sb of the head memory area 12S is used as the head data Db of the reset disk 1b. .

As a result of the comparison, if the two do not match, the system controller 11 replaces the newly set or set disk 1b with the removed disk (1
It is determined that the disk is different from the disk b), and the disk 1b set therein is initialized. That is, the TOC information temporarily written in the main memory area 12M of the set disk 1b as described above is stored in the TOC memory area 12M1, and the disk identification information,
For example, the disc title information is written into the EEPROM 16 and the head data D is read from the set disc 1b.
b is read and stored in the address area 12Sb of the head memory area 12S.

As described above, the set disk is
When the disc is the same as the disc taken out, it is not necessary to read the head data from the re-set disc and store it in the head memory area 12S by reinitialization, so that unnecessary time and power can be saved.

[Head data at power-on and power-on]
In the MD changer system of the embodiment described above, R
The AM 12 is configured as a non-volatile memory, and even if the power of the system is turned off after the system initialization, the TOC memory area 12M1 stores the T of each of the disks 1a to 1e.
OC information is held, and the head memory area 12S stores the head data Da of each of the disks 1a to 1e.
To De are held.

Therefore, after that, when the power is turned on again, each of the disks 1a to 1a is initialized again.
1e to read the head data and read the head memory area 1
There is no need to store it in 2S, and wasteful time and power can be saved.

In this case, the system controller 11
After a certain disk is removed from the disk box 31 after the system initialization, the disk box 3
The same processing as when the same disk is reset or another disk is set in one and the same stage is sequentially executed for each of the disks 1a to 1e.

[Other Embodiments] The main memory area and the head memory area may be separate memories instead of separate areas of one memory as in the above-described embodiment.

In the above embodiment, the recording medium is M
In the case of D, the present invention can be applied to a disc such as a CD other than the MD and a changer system for a recording medium other than the disc. In addition, information recorded on a recording medium and reproduced from the medium is not limited to music,
It may be an image or other information.

[0097]

As described above, according to the first aspect,
In a reproducing apparatus, such as a disc changer system, which can store a plurality of recording media and of which a selected recording medium is mounted at a predetermined position and reproduces the information, once the management information is read from each recording medium, Even when the power is turned off, when the power is turned on again, each recording medium can be identified without reading the management information from each recording medium again.

According to the second aspect of the present invention, by storing the head data in the memory in advance, even when the disk needs to be replaced, the disk specified by the user can be stored in the memory.
In a playback device such as a disc changer system in which sound is played continuously without interruption from the head, the device is initialized, and after the liquid crystal of the recording medium is once stored in the memory, the recording medium is When the data is taken out of the storage medium and then reset in the apparatus, it is not necessary to read the head data from the recording medium and store it in the memory by initialization again, so that unnecessary time and power can be saved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a functional configuration of a disc changer system according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a memory configuration of a disc changer system according to an embodiment of the present invention.

[Explanation of symbols]

1, 1a-1e: disk, 2: spindle motor, 3
... optical head, 7 ... RF amplifier, 8 ... RF decoder, 1
DESCRIPTION OF SYMBOLS 1 ... System controller, 12 ... RAM (random access memory), 12M ... Main memory area, 12S ... Head memory area, 13 ... Audio decoder, 16 ... EE
PROM (nonvolatile memory), 17 dot matrix LED (text display element), 31 disk box, 32 player box, 33 stage controller, 34 loading controller

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D044 AB05 BC06 CC04 DE22 DE54 DE57 FG09 GK12 HH04 5D072 CA17 CB01 EB12 5D077 AA30 AA38 AA40 BA18 CA02 EA12 EA34 HC12

Claims (4)

[Claims] 1. A non-volatile information storage means for storing management information of each recording medium in a reproducing apparatus capable of accommodating a plurality of recording media and mounting and reproducing a selected recording medium at a predetermined position. A playback device comprising: 2. A reproducing apparatus according to claim 1, wherein when a user designates a recording medium, management information of the designated recording medium is read from said information storage means and displayed by a display means. apparatus. 3. A reproducing apparatus capable of accommodating a plurality of recording media, of which a selected recording medium is mounted at a predetermined position for reproduction, wherein a main storage means for sequentially writing data read from the recording medium, Sub-storage means for storing head data of the recording medium, and information storage means for storing management information of each recording medium, and read and output the corresponding head data from the sub-storage means during reproduction. Also, by reading the data after the head data from the corresponding recording medium, writing the data in the main storage means, and reading and outputting from the main storage means, the designated recording medium is reproduced, and the recording medium is read from the apparatus. When a recording medium is set in the device after the device is taken out, the management information recorded on the set recording medium and the information Comparing the management information of the removed recording medium stored in a storage unit with the retrieved recording medium to identify whether the set recording medium is the same as the retrieved recording medium. Playback device. 4. The reproducing apparatus according to claim 3, wherein said sub-storage means and said information storage means are nonvolatile.