JPH087541A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain the preventing of a malfunction by providing a control program determining whether the transmission to a head unit is performed or not in accordance with music number information. CONSTITUTION:Whether the music number of a music to be reproduced is changed or not is discriminated in this device and in the case the music number is changed, whether a new music number is equal to or larger that 100 or not is discriminated. In the case the number is not larger than 100, music number information converted into a BCD code are transferred to an H/U 40 by converting music number information written in an HEX code into information written in the BCD code. However, in the case the number is equal to or larger than 100. the music number information are not transferred to the H/U 40. In such a manner, since even though the music number is changed and in the case the new music number is equal to or larger than 100 the music number information are not transferred to the H/U 40, the H/D 40 never becomes to be the malfunction. Moreover, since the H/D 40 receives the music number information having the BCD code, the music number can be displayed normally in the same way as in the case of a CD A/C (a CD automatic changer). Thus, the malfunction of the H/D 40 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium playing device for playing a recording medium such as a disc.

[0002]

2. Description of the Related Art Among such recording medium playing devices, a compact disc (hereinafter
The spread of CD players that play "CDs" is remarkable. Especially in recent years
The market for players is expanding. Furthermore, among the in-vehicle CD players, a CD that can play multiple CDs
The autochanger (hereinafter referred to as "CDA / C") is housed in the trunk of the car, and the head unit (hereinafter referred to as "H"
A system in which an operation unit called "/ U") and a speaker are installed in a vehicle compartment is widely known. With such a system, music information recorded on a plurality of CDs can be played continuously or by designating a desired song number or randomly. In this case, the music piece number information is communicated by the BCD code.

FIG. 11 is a perspective view showing the appearance of a CDA / C.
In this figure, 401 is a player main body, 402 is a magazine into which a plurality of (four in this case) CDs can be loaded, and 403 is a magazine insertion portion of the main body 401 into which this magazine 402 is inserted. The audio signal reproduced from the CD is sent from the main body 401, amplified by the main amplifier, and output from the speaker (neither is shown). In addition, this body 401
Is connected to an H / U (not shown) by a communication line such as an optical fiber, and exchanges various control information relating to CD performance. The control information includes, for example, music number information during performance and music specification information.

FIG. 12 is a sequence diagram showing a flow of information exchange between the CDA / C and the H / U, and FIG. 13 shows a stock operation between the CDA / C and the H / U. It is a sequence diagram which shows the flow of exchange of the said information.

In FIG. 12, when the EJ key (eject key) is operated on the CDA / C side (step S10)
1) The communication process is started (step S102), the in-EJ information is transmitted (step S103), and the magazine EJ operation is performed (step S104). When the H / U side receives the in-EJ information, reception of a reproduction command or the like is prohibited (step S105). This is because if a reproducing operation is started during ejection of the magazine, a malfunction may occur or the device may be damaged. In the CDA / C, when the magazine is pulled out (step S106), the communication process is started again (step S107), and the EJ completion information is transmitted (step S108).

In FIG. 13, when a magazine is inserted on the CDA / C side (step S109), communication processing is started (step S110), disk checking information is transmitted (step S111), and the presence or absence of the disk is detected. Check processing is performed (step S112). In this case, the H / U side does not prohibit the reception of the playback command or the like even if the information during the disk check is received. This is
This is because the reception of the reproduction command and the like has already been prohibited in the state where the magazine is pulled out in 2. CDA / C
When the check process is completed on the side, the communication process is started (step S113), and the disk check completion information is transmitted (step S114). H / U that received this
On the side, the reproduction command or the like which has been prohibited from being accepted is canceled (step S115).

In this way, by communicating control information between the CDA / C side and the H / U side, the CDA / C in the trunk is controlled by the operation of the H / U from the passenger compartment, and a plurality of CDA / Cs are controlled. CD
It becomes possible to play.

On the other hand, in addition to the reproduction-only CD, a mini disk (hereinafter referred to as "MD") capable of recording and reproducing has been developed. The MD is recordable, more compact than the CD, and has the same amount of recordable information as the CD, and is therefore expected as a next-generation information recording medium. MD devices that play MDs have already been released, and their marketability is drawing attention.

FIG. 14 is an external perspective view of an MD autochanger (hereinafter referred to as "MDA / C") device capable of playing a plurality of MDs. In this figure, 1 is an MDA / C device case, and 300 is an MD (disk) that accommodates a recording medium inside a cartridge. 2 is this disc 300
MD for inserting directly without inserting into magazine
It is an insertion port provided in the device. As described below, MD
A stocker capable of accommodating a plurality of (four in this case) disks is provided in the A / C.

FIG. 15 is a diagram showing a front panel of the MDA / C. This panel is provided with operation keys in addition to the insertion slot 2 described above. 404 is an ST key (stock key) for storing the disc in the stocker, 405 is an EJ key (eject key) for ejecting the disc from the apparatus, 406
Is a disc designation key for designating the disc number.
Reference numeral 407 is a power indicator that lights up when the power is turned on.

FIG. 16 is a sectional view showing the outline of the internal structure of the MDA / C. It should be noted that arrows X1 and X2 in the drawings indicate the front-rear direction of MDA / C. The arrow X1 side is the front side, that is, the operation side, the arrow X2 side is the back side, and the arrow Y
1, Y2 indicate the vertical direction of the MDA / C,
The arrow Y1 side is the lower side and the arrow Y2 side is the upper side.

In FIG. 14, the MDA / C is composed of a device case 1 and a main part provided inside the device case 1.

The upper edge of the front of the equipment case 1 is shown in FIG.
Disc insertion slot 2 for inserting a disc as described in
An insertion prevention shutter 3 for preventing foreign matter from entering the apparatus is attached to the disc insertion opening 2 so as to be openable and closable. Further, a disc extraction sensor 4a, which will be described later, is provided in the vicinity of the disc insertion slot 2 to detect the extraction of the disc.

The main parts provided inside the equipment case 1 are a carrier 5 for carrying and holding an inserted disc, and a disc which is rotationally driven to reproduce information recorded on the disc, or It has a player section 6 which is a playing means for recording new information on a disc, and a stocker 7 for accommodating the disc.

The carrier 5 has the disk insertion opening 2
It is arranged so that it can move up and down on the back side of the carrier 5
A transport roller 8 for holding or transporting the disc inserted in the carrier 5 is rotatably provided on the upper part of the. The rotation operation of the carrying roller 8 is performed by a loading motor (not shown).

In addition, the carrier 5 includes the carrier 5
Disk insertion sensor 4 that detects the insertion of the disk into the inside
b, a loading completion sensor 4c for detecting that the disc is held in the carrier 5, and an eject sensor 4d.

The loading completion sensor 4c detects that the end of the disk loaded into the carrier 5 by the carrying roller 8 is completely held by reaching the position A in FIG. 16, and The carrier 5
It detects that there is a disk inside. Also,
The eject sensor 4d detects that the disc has been ejected from the disc insertion slot 2 to a position where it can be taken out (reload position).

A disc removal sensor 4a provided in the vicinity of the disc insertion port 2 detects whether the disc ejected from the carrier 5 through the disc insertion port 2, that is, the disc at the reload position has been removed. At the same time, when the disc is inserted, the inserted disc is detected and the lifting operation of the carrier 5 is prohibited.

Further, the apparatus is provided with a carrier position sensor (not shown) for accurately detecting the ascending / descending position of the carrier 5, and the position of the carrier 5 and the disc insertion opening 2 are detected by the carrier position sensor. The horizontal movement of the disc in the front-rear direction can be smoothly performed by making the position of each storage portion of the stocker 7 described later face each other.

The player section 6 is disposed below the carrier 5 so as to face the carrier 5. The player section 6 is movably attached to the device case 1 by a damper and a vibration isolation spring (not shown). ing. Therefore, when the disc is driven to rotate, the damper and the vibration-proof spring prevent the vibration of the device case 1 from the outside from being transmitted to the player unit 6 due to the floating state.

The player section 6 is fixed to the equipment case 1 when the disc is not being driven to rotate. Further, the player unit 6 is in a connected state with the carrier 5 having the disc mounted therein when the disc is rotationally driven, so that the disc being mounted on the carrier 5 is placed on a turntable of the player unit 6 which will be described later. It will be installed.

In the player section 6, a turntable 9 on which the disc body 301 of the disc is mounted, a spindle motor 10 for rotating the disc mounted on the turntable 9, and a light beam irradiating the disc body 301. The optical disc 11 has an optical pickup 11 for reading the information recorded on the disc by the light beam reflected on the disc body 301, and a disc mounting completion sensor 4e for detecting that the disc is mounted on the turntable 9. are doing. The optical pickup 11 has a structure of sliding in the disk radial direction by a thread motor (not shown).

The stocker 7 is a rectangular parallelepiped case in which four accommodating portions 70a to 70d for accommodating discs are vertically stacked, and is located on the inner side of the carrier 5 as seen from the disc insertion opening 2. It is arranged so that it can be fixed or can be moved up and down as required.

The accommodating portions 70a to 70d have an identification number #
1 to # 4, the storage section 70a is # 1, and the storage section 70 is
Let b be # 2, the storage section 70c be # 3, and the storage section 70d be # 4. The identification number is the disc number. Which is equivalent to # 2, # 3, # 4 in order from # 1.
And the order.

Each of the storage portions 70a to 70d is formed with an opening on the front side into which a disc can be inserted, and a space for horizontally storing the disc is provided on the back side of each of these openings. In addition, stock completion sensors 71a-7 for detecting the completion of storage of the disks are stored in the respective storages 70a-70d.
1d and a disc ejection / suction mechanism (not shown) that ejects or sucks the disc by the urging force of the spring.

The insertion prevention shutter 3 provided in the disc insertion opening 2 so as to be openable and closable is unlocked or retracted when the carrier 5 is in a position facing the disc insertion opening 2. The carrier 5 is in the locked state when the carrier 5 is located at a position other than the position facing the opening of the storage portion 70a.

Further, the carrier 5 is always in a position facing the opening of the accommodating portion 70b when no instruction is received, that is, in the standby state, and when the carrier 5 is in the standby state, the insertion is performed. The locked state of the prevention shutter 3 prevents foreign matter from entering the MD device and erroneous insertion of the disc.

Since such an MDA / C can play a plurality of MDs, it is most suitable for a vehicle-mounted system. Further, since the MDA / C is small, it can be installed near the driver's seat or the passenger seat instead of the trunk of the car. Therefore, from the user, the conventional CDA /
There is a need for a system that connects MDA / C to H / U instead of C or both conventional CDA / C.

[0029]

However, the conventional M
In D, the music number information is usually recorded in HEX code. On the other hand, on the CD, the music piece number information is recorded as a BCD code. Also, the number of songs that can be specified in CDA / C is 99, but the maximum number is 25 in MDA / C.
You can specify up to 5 songs. Table 1 is 8 for the song number
It is a table which shows a BCD code of 8 bits, and a HEX code of 8 bits.

[0030]

[Table 1] As is clear from this table, the song number and H represented by the BCD code
Some numbers do not match the song numbers represented by the EX code,
With an 8-bit BCD code, only 99 songs can be specified.

Therefore, MDA / C is replaced with conventional H / U (CD
When controlling with A / C compatible H / U), MD
In program processing of A / C control microcomputer, MD
It is conceivable that the music number is treated as it is with an 8-bit HEX code at the time of control, and the music number is converted into an 8-bit BCD code when exchanging with the H / U. When this method is used, the song number is from 100 to 2
There is a problem in handling the number 55 songs.

That is, when the music number information represented by the HEX code is converted into the BCD code and transmitted to the H / U, 9
Although up to 9 song numbers can be expressed in 8 bits, song numbers after the 100th song cannot be expressed in 8 bits and are expressed in 12 bits, so an error occurs in communication for the H / U and normal operation cannot continue.

On the other hand, even when the music number information represented by the HEX code is converted into the BCD code, if the HEX code is transmitted without conversion after the 100th music, the number of music is 97, 98, 99. Then suddenly 64,65,6
Since it becomes 6, the user cannot judge whether it is the 100th song or the 64th song, so that the usability is extremely poor.

Also, in this case, the number of pieces of music advances, and after 69, 6
If it is A, the H / U should not accept codes other than 0-9, so the display may be 60, or you may mistake it for A0 (CD lead-out information) and end the disc. I might assume that it is and issue a command to change to the next disk.

The present invention solves such a conventional problem, and provides an excellent recording medium playing device which does not cause the malfunction of the conventional H / U for CDA / C even when the music number is 100 or more. The purpose is to do.

[0036]

In order to achieve the above object, the present invention has an information recording / reproducing device having a playing means for playing an MD and a connecting means for connecting to a head unit for controlling a playing device for playing a CD. The apparatus is provided with a control unit having a processing program for determining whether or not to transmit the music piece number information to the head unit according to the music piece number information of the music piece recorded in the MD.

[0037]

Therefore, according to the present invention, whether or not to transmit to the head unit is determined according to the music number information, so that the music number cannot be represented by an 8-bit BCD code, for example.
In the above case, the malfunction of the head unit is not caused.

[0038]

Embodiments of the recording medium playing apparatus of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a recording medium playing apparatus M of the present invention.
It is a block diagram of an example of DA / C. In FIG. 1, M
The DA / C has a voice system, a servo system, and a control system. In the audio system, an optical pickup 1 is a reading unit that irradiates a disc surface with a light beam and reads the information data recorded in the disc body 301 of the disc 300 by the light beam reflected by the disc surface.
1 and an RF amplifier 12 for amplifying a high frequency signal read by the optical pickup 11. Further, an ADIP (ADdress In Pre-groove) signal processing unit 13 for decoding an address signal obtained from the RF amplifier 12 and a read signal obtained from the RF amplifier 12 are converted into digital signal audio data, and at the same time, The signal processing unit 14 that performs signal processing, the audio data obtained from the signal processing unit 14 is compressed on the time axis and written in the DRAM 15 which is a shock proof memory, and the audio data read from the DRAM 15 is written. A memory controller 16 that outputs asynchronously (at a slow read rate) and an ATRAC (Adaptive TR) that extends the time axis of audio data obtained from the memory controller 16
ansform Acoustic Coding) signal processing unit 17 and the AT
D / A converter 18 for converting audio data of a digital signal obtained from the RAC signal processing unit 17 into an analog signal
And have. If a magnetic head is provided in the MDA / C to enable recording, the ATRAC
The signal processing unit 17 compresses the audio signal and sends the compressed audio signal to the magnetic head.

The D / A converter 18 is connected via an audio amplifier 19 for amplifying the analog audio signal to a speaker 20 for outputting the analog audio signal amplified by the audio amplifier 19 as audio.

In the servo system, the R
A servo processing unit 21 that receives a read synchronization signal component obtained by the F amplifier 12, other signals such as a tracking error signal, and generates a drive control signal, and the servo processing unit 2
A driver 22 for generating a drive signal for driving a light beam irradiation unit of the optical pickup 11, a tracking actuator, a focus actuator, and a sled motor (none of which are shown) by a control signal from 1.
A driver 25 that generates a rotation speed control signal that controls the rotation speed of the spindle motor 24 that drives the disk body 301 mounted on the turntable 23 in response to a control signal from the servo processing unit 21.

Further, in the control system, an ID hole detecting mechanism 26 for detecting an ID hole provided in the case 302 of the disk 300, a key input interface 27 for receiving input data from an operation unit (not shown), and the above-mentioned A disk loading mechanism 28 including an actuator for loading operation when the disk is mounted on the turntable 23 and various sensors in the MDA / C, and a disk stock mechanism 29 for storing the disk from the carrier in the stocker. , And a CPU 30 that controls the entire MDA / C. The switch 31 inputs a low-level or high-level mode setting signal to the CPU 30 depending on whether the switch 31 is on or off. The mode setting signal will be described later.

On the other hand, H / U4 for controlling this MDA / C
Reference numeral 0 denotes a CPU 42 that communicates with the CPU 30 of the MDA / C through a dedicated communication line 41, and a key input interface 4 that receives input data from an operation unit (not shown) that specifies special reproduction such as specification of a song to be played or scanning or searching.
3 and a display section 44 for displaying the number of the music being played and the like. The communication line 41 is not limited to a dedicated line, and RS-
A general-purpose communication line such as 232C may be used.

Next, the MD executed by the CPU 30.
The operation of A / C will be described.

FIG. 2 is a flow chart showing the operation of the PLAY process. Since the PLAY input key is not provided in the MDA / C, the PLAY command is received from the H / U and the PLAY process of this flowchart is started. First, the pickup is moved to an appropriate position (step S201), and the recording data on the MD is written in the shock proof memory (step S20).
2). Then, it is determined whether the memory space is 10% or less (step S203), and the recording data is written until the memory space is 10% or less.

Then, the data in the shock proof memory is ATRAC decoded and output to the DAC (step S204), and time information check processing is performed (step S205). The time information check process will be described later. Then, it is always determined whether the remaining amount of data in the memory is 80% or less (step S206). If it is not 80% or less, the process proceeds to step S204, and if it is 80% or less, the process proceeds to step S201. To do. In FIG. 2, for convenience of description, writing and reading to and from the memory in S202 and S204 are performed at different timings, but they are actually performed in parallel.

FIG. 3 is a flow chart of the time information check process of step S205 in FIG. It is determined whether the song number of the song to be played has changed (step S301),
If it has changed, it is determined whether the new music number is 100 or more (step S302). If it is not 100 or more, the music number information written with the HEX code is converted into a BCD code, and the music number information converted into the BCD code is transferred to the H / U (step S303). However, when the new song number is 100 or more, the song number information is not transferred to the H / U.

In this way, when the music number changes and the new music number is 100 or more, it is not transferred to the H / U.
/ U does not malfunction. H / U is BCD
Since the music number information of the chord is received, the music number can be normally displayed as in the case of CDA / C.

FIG. 4 is a flow chart of music number designation acceptance processing from the H / U. In FIG. 4, when the music number of the 8-bit BCD code designated from the H / U is received, it is set to 8
Converting to a HEX code of bits (step S40)
1).

In this way, when the music number changes, the HEX code of the new music number is converted into a BCD code for H / U and transferred, and conversely, the BCD code transmitted from the H / U is transferred. By converting the song number into the song number of the HEX code, it becomes possible to connect to the H / U for CDA / C.

FIG. 5 is a flow chart of key processing executed by the CPU 30 of the MDA / C. The CPU 30 determines whether or not there is a key input (step S501),
If there is a key input, it is determined whether or not the EJ key has been pressed (step S502), and if the EJ key has been pressed, EJ processing is performed (step S503). E
If the J key has not been pressed, it is determined whether or not the ST key has been pressed (step S504), and if the ST key has been pressed, ST processing is performed (step S5).
05). If the ST key is not pressed, the process returns to the main routine (not shown).

FIGS. 6 and 7 show E in the flow of FIG.
It is a flow chart of J processing. In this flow, it is determined whether or not there is a disc in the device (step S601),
If there is a disc, magazine EJ information is transmitted (step S602). Actually there is no magazine in MDA / C, but CPU 42 of H / U is connected to MDA
/ C is regarded as CDA / C for communication, so M
The DA / C CPU 30 sends the same information that is emitted from the CDA / C. (H / which received this
U performs a predetermined process, which will be described later. Next, the magazine EJ completion information is transmitted (step S60).
3), it is determined whether or not the EJ key is pressed (step S604). If the EJ key has not been pressed, it is determined whether the disc number key has been pressed (step S605). If the disc number key is pressed, it is determined whether or not there is a disc in the carrier (step S606), and if there is a disc, it is determined whether or not the disc in the carrier is designated (step S607). If not specified, the disc in the carrier is returned to the stocker (step S6).
08). Then, the disc having the designated number is ejected (step S609), the process proceeds to step S611 in FIG. 7, and it is determined whether or not the disc is pushed.

If there is no disc in the carrier in step S606, the process proceeds to step S609.
Further, when the disc in the carrier is designated in step S607, the disc in the carrier is ejected (step S610), and step S in FIG.
The process moves to 611. If the disc has not been pushed in in step S611, step S609 or S
It is determined whether or not the disc ejected in 610 is removed (step S612). If it is removed, the carrier is lowered (step S613) and it is determined whether or not there is a disk in the device (step S6).
14). If there is no disc, the process returns to the routine of FIG. 5, and if there is a disc, the process proceeds to step S604 of FIG.

On the other hand, when the disc is pushed in in step S611, the pushed disc is stored in the stocker (step S615), and it is determined whether or not there is a disc in the apparatus (step S616).
When there is no disc, the routine returns to the routine of FIG. 6, and when there is a disc, the disc checking information is transmitted to the H / U (step S617). After that, when the disc check is completed, the disc check completion information is transmitted to the H / U (step S618), and the process returns to the routine of FIG. When the EJ key is pressed in step S604 of the flow of FIG. 6, step S616 of the flow of FIG.
Move to

FIG. 8 is a flow chart of ST processing in the flow of FIG. In this flow, it is determined whether or not there is a disc in the apparatus (step S701), and if there is a disc, the magazine EJ in-process information is transmitted (step S702). Further, the magazine completion information is transmitted (step S703), it is determined whether or not there is a disc in the carrier (step S704), and if there is a disc in the carrier, the disc is returned to the stocker (step S705). . Then, the carrier is raised to the disc insertion opening (step S706). Step S701
If there is no disc in the device in step S704 and if there is no disc in the carrier in step S704, the process proceeds to step S706 and the carrier is raised to the disc insertion opening.

Then, it is determined whether or not the ST key has been pressed (step S707), and if not pressed, it is determined whether or not a disc has been inserted (step S70).
8) If inserted, the disc is stored in the stocker (step S709). Then, it is determined whether or not all the discs are stored in the stocker, that is, whether or not the stocker is fully distributed (step S710). If not, the process proceeds to step S706, and the carrier is raised to the disc insertion slot. If the stocker is fully distributed, or if the ST key is pressed in step S707, it is determined whether or not there is a disc in the device (step S711). When there is no disc, the routine returns to the routine of FIG. 5, and when there is a disc, the disc checking information is transmitted to the H / U (step S
712). After that, the disk check completion information is sent to H / U.
(Step S713) and returns to the routine of FIG.

Next, communication performed between the MDA / C and the H / U will be described with reference to FIGS. 9 and 10.
In this case, there may be some overlap with the description of the MDA / C flow in FIGS. 6 to 8. That is, FIG.
S601, S602, and S603 are S802 and S802 of FIG.
This is the same processing as S803 and S804, and S806 and S807, and S617 and S618 of FIG. 7 are the same processing as S809 and S810 of FIG.
703, S712, and S713 are 90 in FIG.
2, S903 and S904, S906 and S907, S
This is the same processing as 909 and S910, and S911 and S912.

FIG. 9 is a sequence diagram of the eject operation performed between the MDA / C and the H / U. MDA / C
When the EJ key is operated (step S80
1) It is determined whether or not there is a disc in the device (step S802). If there is no disk, this routine is ended, and if there is a disk, the communication processing is started (step S803). That is, the information in the EJ is H / U
(Step S804). H / which received this
U prohibits acceptance of reproduction commands and the like (step S80).
5).

On the other hand, the MDA / C enters communication processing (step S806) and transmits EJ completion information (step S).
807). After that, EJ processing is performed (step S80).
8). This EJ process is performed in step S604 in FIG.
7 to step S616 in FIG. 7. After the EJ process, the communication process starts (step S80).
9), the disc checking information is transmitted to the H / U (step S810). Further, the communication process is started (step S811), and the disk check completion information is transmitted to the H / U (step S812). The H / U that has received this disk check completion information cancels the prohibition of acceptance of the playback command and the like (step S813) and returns to the main routine.

FIG. 10 is a sequence diagram of a stock operation performed between MDA / C and H / U. MDA / C
When the ST key is operated (step S90
1) It is determined whether or not there is a disc in the device (step S902). If there is no disk, this routine is ended, and if there is a disk, the communication processing is started (step S903). That is, the information in the EJ is H / U
(Step S904). H / which received this
U prohibits acceptance of reproduction commands and the like (step S90).
5).

On the other hand, the MDA / C enters communication processing (step S906) and transmits EJ completion information (step S).
907). Then, ST processing is performed (step S90).
8). This ST processing is step S704 in FIG.
It is each processing from to S711. After the ST process, the communication process is started (step S909), and the disk check information is transmitted to the H / U (step S91).
0). Further, the communication process is started (step S911),
The disk check completion information is transmitted to the H / U (step S912). The H / U that has received this disc check completion information cancels the prohibition of acceptance of the playback command and the like (step S913) and returns to the main routine.

As described above, by transmitting information as if the CDA / C is connected from the MDA / C to the H / U, malfunctions in the disc reproducing operation, the ejecting operation, and the stocking operation are performed. The communication can be performed without causing the error, and the MDA / C can be connected to the H / U.

In the above embodiment, H / U is C
It was explained as a device that can be connected only to DA / C, but MD
An MD compatible H / U that can also support A / C can communicate information with both sides without using a special processing program. Therefore, the switch 31 shown in FIG. 1 is provided to perform switching according to the H / U of the MD compatible type or the H / U of the non-compatible type.

[0064]

As is apparent from the above embodiment, the present invention is a processing program for determining whether or not to transmit the music piece number information to the head unit according to the music piece number information of the music piece recorded on the MD. Since the control means having the above is provided, malfunction of the head unit is not caused when the music number is 100 or more which cannot be represented by an 8-bit BCD code.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of an MD autochanger which is a recording medium playing device of the present invention.

FIG. 2 is a flowchart showing an operation of a PLAY process.

FIG. 3 is a flowchart of a time information check process of step S205 in FIG.

FIG. 4 is a flowchart of a music number designation acceptance process from the head unit.

FIG. 5 is a flowchart of key processing executed by the CPU 30 of the MD autochanger.

6 is a flow chart of EJ processing in the flow of FIG.

7 is a flow chart of EJ processing in the flow of FIG.

8 is a flow chart of ST processing in the flow of FIG.

FIG. 9 is a sequence diagram of an eject operation performed between the MD autochanger and the head unit.

FIG. 10 is a sequence diagram of a stock operation performed between the MD autochanger and the head unit.

FIG. 11 is an external perspective view of a CD auto changer.

FIG. 12 is a sequence diagram showing a flow of exchanging information regarding an eject operation between the CD autochanger and the head unit.

FIG. 13 is a sequence diagram showing a flow of exchanging information regarding a stock operation between a CD autochanger and a head unit.

FIG. 14 is an external perspective view of an MD autochanger capable of playing a plurality of MDs.

FIG. 15 is a diagram showing a front panel of an MD autochanger.

FIG. 16 is a sectional view showing the outline of the internal structure of the MD autochanger.

[Explanation of symbols]

 1 MD autochanger 30 CPU (control means) 40 Head unit 300 MD (disk)

Claims (3)

[Claims] 1. An information recording / reproducing apparatus having a playing means for playing an MD and a connecting means for connecting to a head unit for controlling a playing apparatus for playing a CD, wherein the song number of the song recorded on the MD. An information recording / reproducing apparatus comprising a control means having a processing program for determining whether or not to transmit the music piece number information to the head unit according to the information. 2. The control means transmits the music number information when the music number information is less than a predetermined value, and does not transmit the music number information when the music number information is more than a predetermined value. The information recording / reproducing apparatus according to claim 1, wherein 3. The head unit has a switch indicating whether it is MD compatible or not, and the control means executes the processing program when the switch does not indicate the MD compatible or not. The information recording / reproducing apparatus according to claim 1.