JP2809812B2 - Disc player - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc player, and more particularly to a disc player for reproducing audio information and image information.

2. Description of the Related Art An in-vehicle disk player that plays a digital audio disk (hereinafter simply referred to as an audio disk) called a CD (compact disk) stores read addresses of the disks and uses a backup power supply such as a battery as an operating power supply. A backup memory that retains the storage contents immediately before the power is turned off, and sequentially updates the storage contents of the backup memory to new read addresses in accordance with the change in the read address contents. When the power is turned off and the power is turned off, the immediately preceding read address is stored and held in the backup memory as the last address, and when the power is turned on again, the performance is started from the last address stored and held by the backup memory.

By the way, in recent years, a display is mounted as one of the in-vehicle devices, while map data is stored in a so-called CD-ROM, and necessary map data of the map is read from the CD-ROM and supplied to the display as a display information signal. By doing so, a so-called navigation system has been developed in which a map is displayed on a display so that the current position of the vehicle can be confirmed. A CD-ROM (hereinafter referred to as a memory disk) used as a storage medium for the map data has the same signal format as a CD. For this reason, a memory disk can be played in the same manner as an audio disk only by adding a CD-ROM decoder to a conventional disk player.

In this dual-purpose disk player, the power is turned off by turning off the ACC switch while playing the memory disk,
Then, when the power is turned on again, if the performance is started from the last address stored in the backup memory as in the case of the audio disc, if the map data is not read from the beginning of one map unit, the data will be used as data. Since it has no meaning, a problem occurs that the map displayed before the power is turned off cannot be displayed immediately.

SUMMARY OF THE INVENTION [Object of the Invention] Accordingly, an object of the present invention is to provide a disk player capable of reliably reproducing an information unit (for example, one map screen) reproduced before power-off in an image reproduction mode. With the goal.

[Structure of the Invention] A disk player according to the present invention stores a read address from a disk and stores storage contents at the time of power-off, and newly updates storage contents of a storage unit in response to a change in the read address. Control means for controlling the read address to be updated to a proper read address, reproducing means for starting reproduction of the disc when the power is turned on, and discrimination for determining whether the operation mode when the power is turned off is the audio reproduction mode or the image reproduction mode. Means, and when the determination result by the determination means is in the audio reproduction mode, from the stored approximate read address,
In the image reproduction mode, the reproduction is started from the head address of the predetermined information unit including the read address.

[Operation of the Invention] The disk player according to the present invention stores a read address when the power is turned off, and when the operation mode when the power is turned off when the power is turned on is the audio reproduction mode, the image reproduction mode is started from the stored substantially read address. In the case of, the reproduction is started from the head address of the predetermined information unit including the read address.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, an audio disk / memory disk dual-purpose disk player 1 is inserted into a disk (hereinafter, referred to as a slot) (not shown) formed in a front surface of a housing, for example.
Audio disk and memory disk)
2 is a so-called slot-in type player. In this disc player 1, a disc 2 inserted from the slot is loaded by a loading function 3 and mounted on a turntable 4 at a playing position, and is driven to rotate by a spindle motor 5. Information recorded on the disk 2 is read by the optical pickup 6. The pickup 6 is mounted on a slider (not shown) that moves in the radial direction of the disk 1 using the slider motor 7 as a drive source.

In the case of a CD format signal, the output signal of the pickup 6 is an EFM (Eight to Fourteen Modulation) signal, and the read EFM signal passes through an RF amplifier 8 and an EFM demodulation circuit 9.
After being subjected to EFM demodulation by the D / A
The signal is converted into an analog signal by the converter 12 and output as a reproduced audio signal. The subcode decoder 10 decodes subcode information inserted in units of frames, that is, code information such as a song number, an index, a time and a frame number in a song, and an absolute time and a frame number in a disc. Is performed, and the decoded data is supplied to the player controller 13. The lead-in area of the disc 2 includes a TOC containing disc identification information indicating whether the disc is an audio disc (CD) or a memory disc (CD-ROM).
Index information called (Table Of Contents) is recorded, and this TOC information is also decoded by the subcode decoder 10.

The player controller 13 is composed of a microcomputer, and controls the driving of the loading mechanism 3 by the control of the processor, the position control of the pickup 6 in the disk radial direction by the driving of the slider motor 7 via the slider driving circuit 14, and the spindle driving. In addition to controlling the drive of the spindle motor 5 via the circuit 15, the disc is played based on the disc identification information in the TOC information obtained by reading from the lead-in area and decoding by the subcode decoder 10 when playing the disc. The disc is discriminated whether the disc is an audio disc or a memory disc, and a reading address sequentially obtained from the subcode decoder 10 during performance is transmitted to the system controller 17.

The demodulated output of the EFM demodulation circuit 9 is also supplied to a CD-ROM decoder 16. The CD-ROM decoder 16 decodes the map data obtained by reading from the memory disk (CD-ROM) and demodulating by the EFM demodulation circuit 9 and sending it to a bus line BL made of, for example, an optical fiber.

The system controller 17 is composed of a microcomputer and controls the entire system. The system controller 17 is connected to a player controller 13 and a CD-ROM decoder 16 via a bus line BL, and exchanges information with the controller 17. In the system controller 17,
The read address transmitted from the player controller 13 during the performance is stored in the internal memory, and the stored content is sequentially updated to a new read address according to a change in the content of the read address. A backup power supply such as a battery is used as an operation power supply of the system controller 17, so that the internal memory of the system controller 17 retains the contents stored immediately before the system power supply is cut off by turning off an ACC switch (not shown). This acts as a backup memory that stores and holds the last address. The backup memory also stores and retains mode identification information indicating whether the operation mode when the power is turned off is an audio playback mode based on performance of an audio disk or a map display mode based on performance of a memory disk. The bus line BL is further connected to an operation unit 18 for issuing various commands by a key input by the user and an image display controller 20 for controlling an image display such as a map on a display unit 19 such as a liquid crystal display. .

Next, a processing procedure executed by the processor of the player controller 13 when the system power is turned on again will be described with reference to the flowchart of FIG. Note that re-applying the system power means a state in which the power is turned off while the disc is being taken in due to the turning off of the ACC switch during the disc playing, and then the power is turned on again by turning on the ACC switch.

When the system power is turned on again, the player controller
First, the processor 13 starts the player in a playable state by sequentially performing the pull-in control of the focus servo (step S1), the pull-in control of the spindle servo (step S2), and the pull-in control of the tracking servo (step S3), Thereafter, it waits for the designation of the search destination address from the system controller 17 (step S4). When an address is specified by the system controller 17, the processor searches for the specified address according to a well-known procedure (step S5). When the search operation is completed (step S6), the play mode is set to start playing from that address. Move to (Step S7).

Next, the processing procedure executed by the processor of the system controller 17 when the system power is turned on again will be described with reference to the flowchart of FIG.

Re-inserting the system power causes the system controller
17, the processor first determines whether or not the operation mode before power-off was the map display mode based on the mode identification information stored and held in the backup memory (internal memory) (step S11). If there is, the last address stored in the backup memory is read (step S12), and the head address of the map data in units of one map to which the last address belongs is transmitted to the player controller 13 as the search destination address (step S13). ), And then waits for map data to be sent from the CD-ROM decoder 16 (step S14). In addition,
In the case of map data, when the last address is stored, it is stored including the head address of the map data in units of one map to which the last address belongs. By transmitting the head address, in the disc player 1, the map data of the map displayed before the power is turned off is read from the beginning. When the map data is transmitted from the CD-ROM decoder 16, the processor controls the image display controller 20 to display a map on the display unit 19 based on the map data (step S15).

On the other hand, if it is determined in step S11 that the mode before power-off is not the map display mode, the processor further determines whether or not the mode is the audio playback mode (step S16). Is read out (step S17), and the last address is transmitted to the player controller 13 as a search destination address (step S18). As a result, in the disc player 1, the performance is continuously performed from the address position immediately before the power is turned off.

As described above, when the operation mode before the power is turned off when the power is turned on is the map display mode, the performance is started from the top address of the map data in units of one map to which the last address belongs, so that the display is performed before the power is turned off. Since the map data of the map can be read from the head, the map displayed before the power was turned off after the power was turned on again can be displayed immediately.

In the above embodiment, the system controller
Although the internal memory of 17 acts as a backup memory and the system controller 17 processor controls all control when the power is turned on again, the internal memory of the player controller 13 in the audio playback mode and the image display in the map display mode It goes without saying that the internal memories of the controller 20 may serve as backup memories, and the processors of these controllers may share the roles.

As described above, in the disk player according to the present invention, the read address is stored when the power is turned off, and is stored when the operation mode when the power is turned off when the power is turned on is the audio reproduction mode. From
In the image reproduction mode, the reproduction is started from the head address of the predetermined information unit including the read address, so that the image information such as the map information can be reproduced immediately, and the reproduction can be surely performed without missing the information.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an audio disk / memory disk dual-purpose disk player according to the present invention, FIG. 2 is a flowchart showing a processing procedure executed by a processor of a player controller when the power is turned on again, and FIG. FIG. 5 is a flowchart showing a processing procedure executed by the processor of the system controller when the power is turned on again. Description of Signs of Main Parts 1... Disc player for both audio disk and memory disk 3... Loading mechanism 6... Pickup 9... EFM demodulation circuit 10... Subcode decoder 13. 17 System controller

──────────────────────────────────────────────────続 き Continuing on the front page (72) Fumio Endo 25-1, Nishimachi, Yamada-ji, Kawaji-shi, Saitama Prefecture Pioneer Corporation Kawagoe Plant (72) Inventor Hitoshi Sato 25-1, Nishi-machi, Yamada, Kawagoe-shi, Saitama Pioneer Inside the Kawagoe Factory Co., Ltd. (72) Inventor Kiyoshi Furukawa 25-1, Nishimachi, Yamada-ji, Kawaji-shi, Saitama Prefecture Pioneer Corporation (72) Inventor Kenji Kaneko 25-1, Nishimachi, Yamada-ji, Kawagoe-shi, Saitama Pioneer Corporation (56) References JP-A-59-195391 (JP, A) JP-A-2-78054 (JP, A) JP-A-1-217785 (JP, A) (58) Fields investigated (Int. Cl. ^6, DB name) G11B 19/00 G11B 19/02 G11B 20/10

Claims (2)

(57) [Claims] 1. A storage means for storing a read address from a disk and storing the storage content when power is turned off, and updating the storage content of the storage means to a new read address in response to a change in the content of the read address. Control means for controlling the playback of the disc, a playback means for starting playback of the disc when the power is turned on, a determination means for determining whether an operation mode when the power is turned off is an audio playback mode or an image playback mode, A disc player for starting reproduction from a substantially read address stored when the discrimination result by the means is an audio reproduction mode, and from a head address of a predetermined information unit including the read address in an image reproduction mode. 2. The disk player according to claim 1, wherein said storage means also stores an operation mode before power-off, and said determination means determines an operation mode based on the stored operation mode. .