JP5523732B2 - Disc player - Google Patents

Description

  The present invention relates to a disk reproducing apparatus having a resume function for interrupting data recorded on a recording medium such as a disk, which can be accessed randomly, during reproduction, and then continuing reproduction again from the position at which it was interrupted again.

  A disc playback device such as a CD player or a DVD player plays back data recorded on a disc by reading audio or video data from the disc, generating audio or video signals, and outputting them to a speaker or display.

  Some of these disk playback apparatuses have a so-called resume function in which playback of audio and video is performed from the playback stop position after playback is stopped, as described in Patent Document 1.

  With this resume function, time information, track information, etc. at the time of stoppage are stored in a backup memory, and the information stored in the memory is referred to when starting playback, and playback is resumed from the previous position. ing.

Japanese Patent Publication No. 07-082740

  In recent years, the above-described disk playback apparatus has been mounted on vehicles, and desired music and video can be viewed in the passenger compartment.

  When such a disc playback apparatus is mounted on a vehicle, when the CD player is stopped during playback, information such as the stop position is stored in a memory (volatile) so that resume playback is possible. I have to. In a normal CD player, since power is always supplied to the memory even when the vehicle ACC is turned off, there is no problem in realizing the resume function even with a volatile memory.

  However, there has been a demand for zero current consumption when the vehicle ACC is off, and it is necessary to store information for realizing the resume function even when there is no power supply.

  Even when there is no power supply, it is possible to realize the resume function by holding such information in the nonvolatile memory. However, since it is unknown when the power is turned off, a so-called double buffer structure having two recording areas is provided so as not to lose the resume information. In the double buffer structure, two storage areas are prepared and data is written alternately. Therefore, even when the power is turned off during writing to one storage area, the resume function is realized by using the information in the other storage area, but the component cost increases.

  In addition, when the information for realizing the resume function is recorded in the nonvolatile memory and the power is turned off, the information is not normally recorded and the resume reproduction may not be performed.

  The present invention has been made in view of the above-described problems of the prior art, and retains resume information even when the apparatus is turned off by a simple memory configuration change, and resume playback according to the retained resume information. An object of the present invention is to provide a disc reproducing apparatus capable of realizing the function.

In order to solve the above-described problems of the prior art, according to the basic form of the present invention, a disk playback device that reads a signal stored in a disk, decodes the read signal, and plays it back. First storage means for storing information necessary for resume reproduction in a certain state; second storage means configured by a nonvolatile memory for storing information necessary for resume reproduction; and detecting a reproduction position of the disk; Control means for reproducing the disc from a reproduction position, and the information necessary for the resume reproduction is TOC information and disc configuration information including a directory structure of the file and disc reproduction position information, and the control means Is necessary for the resume reproduction recorded in the first storage means when receiving an instruction to stop the disk reproduction apparatus. Information is stored in the second storage means to stop the reproduction of the disk, and when the power supply to the disk reproduction apparatus is started, information necessary for the resume reproduction stored in the second storage means is stored. When receiving an instruction to transfer to the first storage means and play back the disc, a plurality of resume playbacks differing depending on the type of information required for the resume playback stored in the second storage means. Of the execution methods, there is provided a disc playback apparatus characterized in that a resume playback method corresponding to the instruction is performed to resume playback of the disc.

A disk reproducing apparatus according to this embodiment, the control means, when resuming reproducing the disc, as an execution method of resume reproduction corresponding to the instruction, without lead and disk analysis of TOC of the disc, the first may be performed resume playback of the disc by using the TOC information and disk analysis information of the information necessary for the resume reproduction which has been stored in the second storage means, said control means resumes playback the disc when, as an execution method of resume reproduction corresponding to the instruction, perform read and disk analysis of TOC of the disc, the resume reproduction other than the second TOC information and disk analysis information stored in the storage means You may be able to resume playback of the disc using the necessary information. , Wherein, when resuming reproducing the disc, as an execution method of resume reproduction corresponding to the instruction, performs disk analysis of the disk, other than the disk analysis information stored in the second storage means The disc may be resumed using information necessary for the resume playback.

  According to the disk playback apparatus of the present invention, a nonvolatile memory is added to a system that has realized a resume playback function using a conventional volatile memory. When an instruction to stop the disk playback device is received, information necessary for resume playback stored in the volatile memory is recorded in the nonvolatile memory. This makes it possible to realize a resume playback function without erasing information necessary for resume playback even when the power supply is off.

  In addition, by holding information necessary for resume playback at the time when an instruction to stop the disk playback device is received, the resume playback position can be set at an arbitrary position.

  In addition, a plurality of resume playback methods are available, such as when performing disk analysis such as the TOC and directory structure of the disk during resume playback, and when using information stored in the memory without performing such analysis. Yes. As a result, resume playback can be carried out even if the memory is inadequate.

It is a block diagram which shows the structure of the disc reproducing | regenerating apparatus concerning one Embodiment of this invention. It is a block diagram which shows the structure of the memory of the disc reproducing | regenerating apparatus in FIG. It is a figure which shows an example of PPM information and MPM information which are information required for resume reproduction | regeneration. 3 is a flowchart showing an example of PPM information recording processing performed in the disc playback apparatus of FIG. 1. It is a figure explaining a PPM information recording process. 3 is a flowchart showing an example of resume playback processing performed in the disc playback apparatus of FIG. 1. It is a figure explaining resume reproduction | regeneration processing.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a block diagram of a disc playback apparatus 100 according to an embodiment of the present invention.

  The disc reproducing apparatus 100 according to the present embodiment basically includes a disc drive unit (spindle motor) 2 that drives the disc 1, a disc information reading unit 3 that reads and outputs information on the disc, and an operation unit 4. The disk drive unit 2, the disk information reading unit 3 and the control unit 5 for controlling the operation unit 4 are configured.

  The spindle motor 2 rotates the disk 1 at a predetermined number of rotations under the control of the servo control unit 14.

  The disc information reading unit 3 includes a pickup 6, an RF amplifier 7, a digital signal processing unit 8, a RAM 9, a decoder 10, a RAM 11, and an output unit 12.

  The pickup 6 irradiates the disk 1 with a laser beam, picks up a recorded signal corresponding to the amount of reflected light reflected from the disk 1, and outputs it to the RF amplifier 7. The RF amplifier 7 amplifies the input signal and outputs the amplified signal to the digital signal processing unit 8. The digital signal processing unit 8 performs processing for removing noise, distortion, and the like of the reproduction signal read by the pickup 6 to generate encoded data.

  The decoder 10 decodes the encoded data signal-processed by the digital signal processing unit 8. A RAM 11 connected to the decoder 10 is a memory for temporarily storing the decoded data. The RAM 11 is assigned an area for recording resume information as will be described later, and holds information necessary for resume reproduction. The decoded data signal is D / A converted by the output unit 12 to output audio and video.

  The thread motor 13 rotates a screw guide that linearly moves the pickup 6 between the outer periphery and the inner periphery of the disk 1. When the screw guide is rotated in one direction, the pickup 6 moves to the inner peripheral side of the disk 1, for example, and when the screw guide is rotated in the other direction, the pickup 6 moves to the outer peripheral side of the disk 1.

  The operation unit 4 receives an input operation performed by the user. For example, a command corresponding to a method for replaying a disc is input. Also, the resume playback position is designated by inputting an instruction to stop the apparatus during the playback of the disk 1.

  The control unit 5 includes a microcomputer 15 and a servo control unit 14. Further, the microcomputer 15 has a nonvolatile memory 16 and a RAM 17.

  The servo control unit 14 operates according to an instruction from the microcomputer 15 and controls the spindle motor 2, the sled motor 13, and the pickup 6.

  As will be described later, PPM information necessary for resume reproduction is recorded in the nonvolatile memory 16 every time the apparatus is turned off. An area for recording resume information is allocated to the RAM 17 and information necessary for resume reproduction is held.

  Next, processing of information related to resume playback of the disc playback apparatus 100 will be described with reference to FIGS. 2 and 3. FIG. 2 is a diagram showing the configuration of the memory portion in the disc playback apparatus 100 of FIG. FIG. 3 is a diagram showing an example of information (PPM information and MPM information) necessary for resume reproduction.

  The memory of the disk reproducing apparatus 100 is composed of a conventional first memory 21 (first storage means) using a volatile memory and a second memory 22 (second storage means) using a nonvolatile memory. Has been. The first memory 21 includes a decoder RAM 23 and an MCU-RAM 25, and a resume information recording area 24 is allocated to the decoder RAM 23. In the resume information recording area 24, reproduction position information and disc configuration information are held.

  As shown in FIG. 3A, the reproduction position (Last Position Play) information holds reproduction information, tag information, and a Mix reproduction history. The reproduction information includes time information MSF (M = minute, S = second, F = frame) expressing a data position, a track, and a file number. The tag information includes information such as the name of the file being played and the genre of the music.

  The disc configuration information is disc configuration information held in the RAM in the decoder, and includes the recording position of each folder or file on the disc, the size of each folder or file, and detailed information on the folder or file.

  In addition, a PPM information recording area 26 and a resume information recording area 27 are allocated to the MCU-RAM 25. The PPM information recording area 26 temporarily holds information necessary for resume reproduction recorded in the second memory 22. For example, information (file name, folder name, etc.) of the music being played is retained. The resume information recording area 27 holds disc configuration information including information on the music being reproduced.

  As shown in FIG. 3A, the disk configuration information includes TOC (Table Of Contents) information, session information, and folder / file configuration. The TOC information is recorded in the lead-in area of the disc session, and the track start time is held. The session information holds the number of sessions, the session start time, and the lead-out time of each session. Further, the folder / file structure holds the number of files in the folder, the file type, the total number of files, and the total number of folders.

  On the other hand, the second memory 22 is composed of a nonvolatile memory (EEPROM) 28, and a PPM information recording area 29 and an MPM information recording area 30 are allocated thereto. Information necessary for resume reproduction is recorded in the PPM information recording area 29, and information indicating a mechanical state necessary for resume reproduction is recorded in the MPM information recording area 30.

  Information required for resume reproduction is transferred from the first memory 21 and recorded in the PPM information recording area 29 when an instruction to stop the apparatus is received. The MPM information is information indicating the state of the mechanism necessary for resume reproduction as shown in FIGS. 3B and 3C.

  FIG. 3B shows the case where the mechanism is a changer mechanism that handles a plurality of discs, and whether or not there is a disc in each tray and information on the disc number of the current tray is included.

  FIG. 3C shows the case of a single mechanism that handles one disk, and includes disk size information and the like.

  In the disc playback apparatus 100 configured as described above, when the control unit 5 receives a system-off command (command to stop the apparatus) during playback of the disc, the position of the disc of the music being played at that time Information necessary for resume reproduction is extracted from the decoder RAM 23 and MCU-RAM 25 that temporarily store information and the like, and stored in the nonvolatile memory 28. When it is detected again that the disk playback apparatus 100 is powered on, information stored in the non-volatile memory 28 and necessary for resume playback is transferred to the decoder RAM 23 and MCU-RAM 25, and resume playback is performed. . At this time, a different resume playback method can be specified depending on whether or not the analysis of the TOC or the disc is performed from the disc, and the resume playback by the specified method is performed.

  The resume playback function in the disc playback apparatus 100 will be described below. First, a recording function of information (PPM information) necessary for resume will be described, and then a PPM information reading function and a resume reproduction command will be described.

  The PPM information recording process in the disc playback apparatus 100 will be described below with reference to the flowchart in FIG.

  First, in step S11, disk analysis is performed. In the disk analysis, directory information and TOC information are analyzed. The directory information is information about what directory has what hierarchical structure on the disk and file position information indicating which directory the file belongs to and at which position (address) on the disk. The TOC information is information on the total number of tracks on the disk and the track start position.

  In the next step S12, the TOC information, session information, and folder / file structure information analyzed in step S11 are stored in the resume information recording area 27 of the MCU-RAM 25.

  In the next step S13, the reproduction information, the final position (Last Position Play) information of the tag information and the directory information analyzed in step S11 are stored in the resume information recording area 24 of the decoder RAM 23.

  In the next step S14, the disc is reproduced.

  In the next step S15, a system off command is received. The system off command is input from the user via the operation unit 4. The control unit 5 analyzes the received command and determines that it is a system off command.

  In the next step S16, PPM information is recorded in the nonvolatile memory 28. 5A and 5B show an outline of the transfer of PPM information to the nonvolatile memory 28. FIG. First, as shown in FIG. 5A, the PPM information stored in the resume information recording area 27 of the MCU-RAM 25 is transferred to the PPM information recording area 26 of the MCU-RAM 25. Further, the PPM information stored in the resume information recording area 24 of the decoder RAM 23 is transferred to the PPM information recording area 26 of the MCU-RAM 25. Thereafter, as shown in FIG. 5B, the PPM information in the PPM information recording area 26 of the MCU-RAM 25 is transferred to the PPM information recording area 29 of the nonvolatile memory 28.

  Through the above processing, the PPM information necessary for resume reproduction at the time when the system off command is received is held in the nonvolatile memory 28. This information is retained without being erased even when the ACC of the vehicle is turned off and power is not supplied to the disc playback apparatus 100. In addition, since the PPM information is held only when the system off command is received, the memory area only needs to be the amount of one resume information.

  Next, resume playback processing in the disc playback apparatus 100 will be described with reference to the flowchart of FIG.

  First, in step S21, it is detected that power is supplied to the disc playback apparatus 100. It is detected when the ACC of the vehicle is turned on.

  In the next step S22, the PPM information stored in the nonvolatile memory 28 is transferred to the PPM information recording area 26 of the MCU-RAM 25. In the PPM information recording area 29 of the non-volatile memory 28, the PPM information stored in the decoder RAM 23 and the PPM information stored in the MCU-RAM 25 are stored in a distinguished state, and the PPM information in the MCU-RAM 25 has the same configuration. Transfer to the recording area 26.

  In the next step S23, a resume playback command is acquired. Via the operation unit 4, the user designates how to resume playback. As resume playback commands when performing resume playback, four types of commands are prepared according to the recorded contents of the resume (disk configuration such as folder information and file information). Depending on the disc playback device, the content of the resume playback information stored in the nonvolatile memory 28 may be different. In addition, there is a possibility that problems such as failure to record resume reproduction information in the nonvolatile memory 28 may occur. In such a case, by preparing a plurality of resume reproduction methods, the resume reproduction can be surely performed.

(1) Normal Play command With this command, if there is resume information in the first memory 21, resume playback is performed, and if not, TOC Read is performed, and playback is performed from the beginning.

(2) PPM Play Without TOC Read Command This command can be executed when TOC information, disk configuration, and resume playback position are recorded as resume information. When this command is instructed, the disk TOC Read and disk analysis are not performed, and resume playback is performed using only the PPM information stored in the nonvolatile memory 28.

  In the execution of resume reproduction by this command, the amount of PPM information necessary for resume reproduction is large, and the time required for recording the PPM information from the nonvolatile memory 28 to the resume information recording areas 24 and 27 of the decoder RAM 23 and MCU-RAM 25 is as follows. However, the time required until the resume reproduction is started is shortened.

(3) PPM Play With TOC Read command This command can be executed when the resume playback position is recorded. When this command is instructed, disc TOC read and disc analysis are performed, and then resume playback is performed using the TOC information stored in the nonvolatile memory 28 and PPM information other than the disc analysis information.

  In the execution of resume reproduction by this command, the amount of PPM information necessary for resume reproduction is small, and the time required for recording the PPM information from the nonvolatile memory 28 to the resume information recording areas 24 and 27 of the decoder RAM 23 and MCU-RAM 25 is as follows. Although it is short, it takes time to start resume playback.

(4) PPM Play With Disc Analysis command This command can be executed when a resume playback position and TOC information are recorded. When this command is instructed, disc TOC read is not performed, disc analysis is performed, and then resume playback is performed using PPM information other than the disc analysis information stored in the nonvolatile memory 28.

  In the execution of resume reproduction by this command, the amount of PPM information necessary for resume reproduction is intermediate between (2) and (3), and the PPM information is transferred from the nonvolatile memory 28 to the resume information recording area 24 of the decoder RAM 23 and MCU-RAM 25. , 27 is intermediate between (2) and (3).

  Next, returning to FIG. 6, in step S24, necessary PPM information is developed in the resume information recording areas 24 and 27 of the decoder RAM 23 and MCU-RAM 25 in accordance with the resume reproduction command. FIGS. 7A and 7B show an outline of development of PPM information in the resume information recording area. First, FIG. 7A corresponds to step S22, and shows a state in which PPM information necessary for resume reproduction is transferred from the PPM information recording area 29 of the nonvolatile memory 28 to the PPM information recording area 26 of the MCU-RAM 25. .

  Next, as shown in FIG. 7B, PPM information PPM Info (DEC) is stored in the resume information recording area 24 of the decoder RAM 23 from the PPM information recording area 26 of the MCU-RAM 25, and the PPM information recording area of the MCU-RAM 25 is stored. 26, PPM Info (MCU) is stored in the resume information recording area 27 of the MCU-RAM 25.

  In the next step S25, according to the resume playback command, necessary information for resume playback is acquired in addition to the PPM information stored in the PPM information recording area 29 of the nonvolatile memory 28. For example, when the resume playback command is “No TOC read”, the resume playback is performed using only the PPM information stored in the PPM information recording area 29 of the nonvolatile memory 28, so that it is necessary to acquire other information. There is no. If the resume playback command is TOC read, TOC information and disc analysis are executed from the disc 1 to obtain information on the resume playback position.

  In the next step S26, resume playback corresponding to each command is performed with reference to information necessary for resume playback of the mechanism stored in the MPM information recording area 30 of the nonvolatile memory 28.

  As described above, according to the disk playback apparatus 100 of the present embodiment, a nonvolatile memory is added to a system that has realized a resume playback function using a conventional volatile memory. When an instruction to stop the disk playback device is received, information necessary for resume playback stored in the volatile memory is recorded in the nonvolatile memory. This makes it possible to realize a resume playback function without erasing information necessary for resume playback even when the power supply is off.

  In addition, by holding information necessary for resume playback at the time when an instruction to stop the disk playback device is received, the resume playback position can be set at an arbitrary position.

  In addition, a plurality of resume playback methods are available, such as when performing disk analysis such as the TOC and directory structure of the disk during resume playback, and when using information stored in the memory without performing such analysis. Yes. As a result, resume playback can be carried out even if the memory is inadequate.

1 ... disc,
2 ... Spindle motor,
3. Disc information reading unit,
4 ... operation part,
5. Control unit (control means),
11, 23 ... Decoder RAM,
16, 28 ... EEPROM (nonvolatile memory),
17, 25 ... MCU-RAM,
21 ... 1st memory (1st memory | storage means),
22 ... Second memory (second storage means),
24, 27 ... Resume information recording area,
26, 29 ... PPM information recording area,
100: Disc player.

Claims (4)

A disk playback device that reads a signal stored in a disk, decodes the read signal, and plays back the signal.
First storage means for storing information necessary for resume reproduction in a state where power is supplied;
Second storage means configured by a non-volatile memory and storing information necessary for the resume reproduction;
Control means for detecting the playback position of the disc and playing the disc from the playback position;
Have
The information necessary for the resume reproduction is the disk configuration information including the TOC information and the directory structure of the file, and the reproduction position information of the disk.
The control means stores in the second storage means the information necessary for the resume reproduction recorded in the first storage means when receiving an instruction to stop the disk reproduction apparatus. Stop playing,
When the power supply of the disk playback device is started, the information necessary for the resume playback stored in the second storage means is transferred to the first storage means,
When an instruction to play the disc is received , it corresponds to the instruction among a plurality of resume playback execution methods that differ depending on the type of information required for the resume playback stored in the second storage means. A disc reproducing apparatus for performing resume reproduction of the disc by executing a method for executing resume reproduction . Wherein, when resuming reproducing the disc, as an execution method of resume reproduction corresponding to the instruction, without lead and disk analysis of TOC of the disc, it has been stored in the second storage means 2. The disc playback apparatus according to claim 1 , wherein said disc is resumed using TOC information and disc analysis information of information necessary for said resume playback. When resuming playback of the disc, the control means performs TOC reading and disc analysis of the disc as a method of executing resume playback corresponding to the instruction, and stores the TOC stored in the second storage means. 2. The disc playback apparatus according to claim 1 , wherein said disc is resumed using information necessary for said resume playback other than information and disc analysis information. Wherein, when resuming reproducing the disc, as an execution method of resume reproduction corresponding to the instruction, it performs disk analysis of the disk, other than the disk analysis information stored in the second storage means 2. The disk reproducing apparatus according to claim 1 , wherein the disk is resumed using information necessary for the resume reproduction.

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