JP4059261B2 - Disc player - Google Patents

Description

  The present invention relates to a disc reproducing apparatus capable of reproducing a rewritable multi-session disc.

  There have been proposed a disc (hereinafter referred to as a multi-session disc) employing a multi-session method such as CD-R (Compact Disc-Recordable) and CD-RW (Compact Disc-ReWritable), and a playback apparatus thereof ( For example, the following patent document 1). In the multi-session disc, one session including a plurality of tracks (files) is recorded in one recording, and data can be additionally recorded on the disc in session units.

  FIG. 4 is a diagram for explaining the data structure of a multi-session disc (for example, CD-RW). The multi-session disc includes a plurality of sessions (first session and second session) in order from the inner circumference side of the disc. Each session includes a lead-in area, a data area, and a lead-out area in order from the inner periphery side.

  The lead-in area is an area indicating the start of a session, and records track information of tracks included in the data area, data area length (time), and TOC (Table Of Contents) information including the start address of the lead-out area. To do. In the lead-in area, the start address of the data area of the next session is recorded. The data area is an area for recording a track of the session (for example, content such as a music file). The lead-out area is an area indicating the end of the session.

  As shown in FIG. 4A, the state where the start address of the data area of the next session is recorded in the lead-in area of the last session (second session in FIG. 4A) is “closed”. No, "says that the next session can be added to the disc. On the other hand, as shown in FIG. 4B, a state in which the start address of the data area of the next session is not recorded in the lead-in area of the last session (second session) is called “closed” and the disk The next session cannot be added.

  CD-RW is a rewritable (overwriteable) disc. As shown in FIG. 4C, after recording and closing a plurality of sessions on the entire disc, all recorded sessions are erased (initialized). Instead, only the first session (the lead-in area) can be erased, and new sessions can be overwritten in order from the inner periphery side. In this case, immediately after the overwritten new session (second session), the old data remains without being erased. If the disc is not closed after recording a new session (first and second sessions), the start address of the data area of the next session is recorded in the lead-in area of the last session (second session). In this address, old data is recorded, not the data area of the next session.

  When a disc as shown in FIG. 4C is inserted into the disc playback apparatus, and the disc playback apparatus reads the TOC information from the lead-in area of each session, the time until the reading of the information becomes very long. There is a problem. This is because it takes a long time to determine whether there is actually a next session at the start address of the next data area recorded in the lead-in area of the last session. Specifically, when a disc is inserted, the disc playback device recognizes sessions in order from the inner circumference side and detects the start address of the data area of the next session recorded in the lead-in area of the final session. To do. Then, the optical pickup is moved to this address, but since old data is recorded at that address, the data in the lead-in area cannot be read, but it cannot be immediately determined that there is no session. That is, it cannot be determined whether the position of the optical pickup is accurate or whether the session (lead-in area) really does not exist. As a result, after the optical pickup is once returned to the lead-out area of the final session, the operation of moving to the address again and determining whether or not there is a session is repeated a plurality of times. When it is not possible to finally determine the presence or absence of a session, the disc reproducing apparatus determines that old data is recorded at this address and that the next session does not exist. For this reason, it takes time to determine that it is the last session, and it takes a long time to read the TOC information from the disk and display it on the display unit.

JP 2003-272169 A

  An object of the present invention is to provide a disc playback apparatus that can immediately determine the last session of an overwritten multi-session disc that has not been closed, and can quickly read the TOC information.

According to a preferred embodiment of the present invention, there is provided a disk reproducing apparatus for reading data of each session recorded on a multi-session type disk having a plurality of sessions including a lead-in area, a data area, and a lead-out area in this order. Address storage means for storing a first address indicating the start position of the lead-out area of the session and a second address indicating the start position of the data area of the next session included in the lead-in area of the session; Means for determining whether or not a position where the reading means reads data is between the first address and the second address; and a position where the reading means reads data from the first address to the second address. The position where the reading means reads the data when it exists between the addresses. Area determining means for determining whether or not the area or lead-out area, and session determining means for determining that the next session does not exist when it is determined that the area determining means is not the lead-in area or the lead-out area When the area determining means determines that the position where the reading means reads the data is the lead-out area, the area determining means changes the position where the reading means reads the data, and then the area determining means If the position where the reading means reads data does not exist between the first address and the second address, the reading means changes the position where the data is read, and the reading means reads the data, When the session determination means determines that the next session does not exist, the reading means finishes reading the data That.

  In a preferred embodiment, when the area determining means determines that the position where the reading means reads data is a lead-in area, the reading means reads the data in the lead-in area.

Reading means data (e.g., TOC information) position for reading the found first address or we indicate the start position of the lead-out area of the current session, until the second address indicating a start position of the data area of the next session If there is a next session, the position where the reading means reads the data is always located in the lead-in area or the lead-out area. Therefore, if it is determined that the position where the reading unit reads data is not in the lead-in area or the lead-out area, it may be determined that the old data remains without being erased instead of the next session. it can. Therefore, since it is possible to immediately determine that it is the final session, the data (TOC information) reading process can be performed quickly.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings. However, the present invention is not limited to these embodiments. FIG. 1 is a schematic block diagram showing a disc playback apparatus 10 according to a preferred embodiment of the present invention. FIG. 2 is a diagram showing the data structure of a multi-session disc that has been overwritten and not closed. The disc playback apparatus 10 is a multi-session method and can play back a rewritable (overwritten) disc (CD-RW in this example). A multi-session type disk (hereinafter referred to as a multi-session disk) is a disk having a plurality of sessions including a lead-in area, a data area, and a lead-out area from the inner periphery side, as shown in FIGS.

  The disc playback apparatus 10 includes a system control unit 11, a display unit 12, an operation unit 13, a playback operation drive unit 14, a signal processing circuit 15, and a D / A converter 16.

  The system control unit 11 outputs a command to each unit of the disc playback apparatus 10 to control each unit, and includes a CPU 11a, a ROM 11b, and a RAM 11c.

  The CPU 11a reads various programs stored in the ROM 11b based on operation signals input from the operation unit 13, expands them in the work memory of the RAM 11c, and executes various processes according to the programs. Note that data transmission / reception between the CPU 11a and the outside is executed via an input port and an output port (not shown).

  The CPU 11a stores the TOC information included in the lead-in area in the RAM 11c, and causes the display unit 12 to display the TOC information. Further, as shown in FIG. 2, the CPU 11a determines the start address (address 1) of the lead-out area of the session included in the lead-in area and the start address (address 2) of the data area of the next session. Store in the RAM 11c. Further, the CPU 11a calculates the lead-in area address (referred to as address 3) of the next session based on the address 2 and stores it in the RAM 11c. Further, the CPU 11a determines whether or not the position where the optical pickup 14a reads data is between the address 1 and the address 2. Here, instead of between address 1 and address 2, it may be between address 2 and an address that is a predetermined position inside (front side) from address 2. These are collectively referred to as “between a predetermined address and address 2” in this example. That is, the predetermined address here is an address assumed to be the start address of the lead-out area of the session. The address refers to an address indicating a position where data on the disc is recorded.

  Further, the CPU 11a confirms the track number of the subcode read from the disk, and determines whether or not the position where the optical pickup 14a reads data is located in the lead-in area or the lead-out area. The CPU 11a also performs the following when the reading position of the optical pickup 14a is located between the address 1 and the address 2 and the reading position of the optical pickup 14a is not located in the lead-in area or the lead-out area. It is determined that old data remains in this area, and there is no next session (lead-in area), and the reproduction operation driving unit 14 terminates the reading process.

  That is, when the optical pickup 14a is located between the address 1 and the address 2, if there is a next session, there should be a lead-in area or an adjacent lead-out immediately before that. However, if the CPU 11a cannot find either the lead-in area or the lead-out area, old data exists in the subsequent areas, so that it can be immediately determined that it is the last session.

  The ROM 11b stores a control program for the disk playback apparatus 10 and the like. The ROM 11b is composed of a magnetic or optical recording medium or a nonvolatile memory such as a semiconductor.

  The RAM 11c forms a work area for temporarily storing a program read from the ROM 11b, data read from the disk, input or output data in each process executed by the CPU 11a. The RAM 11c stores the start address (address 1) of the lead-out area, the start address (address 2) of the data area of the next session, and the address (address 3) of the lead-in area of the next session. The

  The display unit 12 is configured by an LCD (Liquid Crystal Display) or the like, and displays TOC information such as the number of tracks recorded on the disc and the playback time based on commands and display contents input from the CPU 11a.

  The operation unit 13 includes various function keys such as a reproduction key, a numeric keypad, a SKIP UP / DOWN key, a stop key, and an EJECT key, and outputs an operation signal generated by the key operation to the system control unit 11. The operation unit 13 may output an operation signal by remote control to the system control unit 11.

  The reproduction operation drive unit 14 reads the TOC information and the second address recorded in the lead-in area and outputs them to the system control unit 11. The reproduction operation drive unit 14 also reads the track number included in the subcode and outputs it to the system control unit 11. The reproduction operation drive unit 14 also reads the data recorded in the data area and outputs it to the signal processing circuit 15. The reproduction operation drive unit 14 includes an optical pickup 14a and a servo circuit 14b. The reproduction operation drive unit 14 retrieves a target address on the disk and reproduces data corresponding to the address by a command input from the system control unit 11. The optical pickup 14a moves in the radial direction of the disk by a thread controlled by the servo circuit 14b, irradiates the disk with laser light, and converts the reflected light into an electrical signal, thereby recording data recorded on the disk. Read.

  The signal processing circuit 15 is configured by a DSP (Digital Signal Processor) or the like, and executes a decoding process on data read by the optical pickup 14a. Specifically, the CPU 11a sets a decoding method (EFM decoding / AAC decoding / MP3 decoding, etc.) corresponding to the track (file) for each session, and the decoding processing of the decoding method is executed.

  The D / A converter 16 converts the data processed by the signal processing circuit 15 into an analog signal during disk reproduction. The output of the D / A converter 16 is supplied to an amplifier device and a speaker connected to the outside via a sound output terminal (not shown) and reproduced as sound.

  The operation of reading TOC information from the disc in the disc reproducing apparatus 10 having the above configuration will be described with reference to FIGS. FIG. 3 is a flowchart showing the TOC information reading operation of the disc playback apparatus 10.

  When the disc is inserted into the disc playback apparatus 10, the CPU 11a moves the optical pickup 14a to the lead-in area of the first session (S1). In the lead-in area, since the track number recorded in the subcode is defined as “00” in hexadecimal, when the signal on the disk is read and the track number is “00”, the CPU 11a It can be determined that the pickup 14a is located in the lead-in area. The optical pickup 14a reads the data (TOC information and the second address) in the lead-in area and supplies it to the system control unit 11 (S2). CPU11a memorize | stores the start address (address 1) of the lead-out area of the said session in RAM11c among the TOC information read by the optical pick-up 14a (S3). The CPU 11a also stores the TOC information (number of tracks, reproduction time, etc.) other than the address 1 in the RAM 11c in the same manner.

  Next, the CPU 11a determines whether or not the data in the lead-in area read by the optical pickup 14a includes the start address (address 2) of the data area of the next session (S4). That is, in the case of NO in S4, it is determined that the disk is a single session disk (session is one disk) or the last session of a closed multi-session disk. As a result, the CPU 11a causes the optical pickup 14a to end the reading process. On the other hand, when the address 2 is included (S4: YES), the CPU 11a stores the address 2 in the RAM 11c (S5).

  Next, the CPU 11a clears the retry count counter set in the RAM 11a to 0 (S6). This retry count counter moves the optical pickup 14a again when the optical pickup 14a has moved to the lead-in area in S9, S14, and S15, but data is not optically recorded at the destination address. Used to count the number of times to retry (retry). Next, based on the address 2 stored in the RAM 11c, the CPU 11a changes the address (address 3) of the lead-in area of the next session from the address 2 to, for example, 750 (this value is 1 in the CD-RW). It is shorter than the length from the start address of the lead-in area of one session to the start address of the data area (that is, address 3 is an address in the lead-in area.) Is calculated by subtraction and stored in the RAM 11c (S7). .

  Next, the CPU 11a moves the optical pickup 14a while targeting the address 3 in the lead-in area of the next session (S8). Then, the optical pickup 14 a irradiates the disk with a laser at the address, converts the reflected signal into an electric signal, and supplies it to the system control unit 11. The CPU 11a determines whether or not data is optically recorded at the address by determining whether or not a signal indicating recording data is included in the supplied signal (S9). If it is determined that no data is recorded (S9: NO), the CPU 11a increments the retry counter (S14), and determines that the retry counter value is less than a predetermined value (10 in this example) ( S15: YES), the process returns to S8, and the optical pickup 14a is moved again toward the address 3. That is, the process of moving the optical pickup 14a toward the position of the address 3 is repeated until the optical pickup accurately reaches the address where the data is recorded (S8, S9, S14, S15). . If the retry counter reaches 10 in S15, it is determined that there is no session, and reading of the TOC information is terminated.

  If it is determined that data is recorded at the address where the optical pickup 14a is located (S9: YES), the optical pickup 14a reads the current address and track number in the subcode recorded at the address. It supplies to the system control part 11 (S10). Next, the CPU 11a determines whether or not the current address where the optical pickup 14a is located is between the address 1 and the address 2 (S11). That is, since the lead-in area of the next session exists between address 1 and address 2, the CPU 11a determines that the current address where the optical pickup 14a is located is not between address 1 and address 2 (S11: NO) ), It is determined that the optical pickup 14a is not located at the position assumed to be the lead-in area of the next session, and the process returns to S8 to move the optical pickup 14a toward the address 3 again.

  On the other hand, when the current address where the optical pickup 14a is located is between the address 1 and the address 2 (S11: YES), the CPU 11a is located at a position where the optical pickup 14a is assumed to be the lead-in area of the next session. Then, the process proceeds to S12. Then, the CPU 11a determines whether or not the track number is “00” representing the lead-in area (S12). When the track number is “00” (S12: YES), the optical pickup 14a is located in the lead-in area of the next session, so the process returns to S2, and the optical pickup 14a reads the TOC information from the lead-in area. To the system control unit 11.

  When the track number is not “00” (S12: NO), the CPU 11a determines whether or not the track number is “AA” representing the lead-out area. When the track number is “AA” (S13: YES), the CPU 11a determines that the optical pickup 14a is located in the lead-out area of the previous session, returns to S8, and points the optical pickup 14a to the address 3 again. Then, it is determined again whether the current address is between address 1 and address 2 (S11) or whether the track number is “00” or “AA” (S12, S13).

  On the other hand, when the track number is not “AA” (S13: NO), as shown in FIG. 2, the CPU 11a records, for example, a data area of old data at a position assumed to be a lead-in area of the next session. Therefore, it is determined that the next session does not exist (the last session), and the reading process is terminated. It can be determined that old data exists. If data exists between address 1 and address 2, if there is a next session, the lead-in area of the next session or the lead-out area immediately adjacent to it However, if neither of these exists, not the next session, but other old data remains without being erased.

  When the reading process ends, the CPU 11a outputs the TOC information stored in the RAM 11c to the display unit 12 for display.

  With the above processing, for example, in the case of a single session disc, after the data of one session is read, it is determined in S4 that there is no next session, and the processing ends. In the case of a closed multi-session disc (FIG. 4B), after reading to the last session, it is determined in S4 that the start address of the data area of the next session is not recorded, and the processing is terminated. In the case of a non-closed multi-session disc (FIG. 4A), the start address of the data area of the next session is recorded in the lead-in area of the last session, but no data is recorded in address 3 Therefore, the process ends through S9: NO. In the case of an overwritten multi-session disc that has not been closed (FIG. 2, FIG. 4C), the start address of the data area of the next session is recorded in the lead-in area of the last session. Since old data is stored, the process ends through S9 to S13.

  As described above, for an overwritten multi-session disc that is not closed, the current address on the disc from which the optical pickup reads data is between the first address and the second address, and the optical pickup If the current address (position estimated as the lead-in area) is neither the lead-in area nor the lead-out area, old data is recorded in the subsequent areas, and the next session does not exist (the last session) ). Therefore, the TOC information reading process can be executed quickly.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment. Further, the program may be provided in the form of a program for causing a computer to execute the operation of the disk playback device and a recording medium on which the program is recorded.

  The present invention can be suitably employed in any disc playback apparatus that can play back a rewritable multi-session disc.

1 is a block diagram showing a disc playback apparatus 10 according to a preferred embodiment of the present invention. It is a figure which shows the data structure of the CD-RW disc which has been overwritten and is not closed. 4 is a flowchart showing a TOC information reading operation of the disc playback apparatus 10. It is a figure explaining the data structure of a multi session disc.

Explanation of symbols

10 Disc playback device 11 System control unit 14 Playback operation drive unit

Claims (2)

Reading means for reading data of each session recorded on a multi-session type disc having a plurality of sessions including a lead-in area, a data area, and a lead-out area in this order ;
Address storage means for storing a first address indicating the start position of the lead-out area of the session and a second address indicating the start position of the data area of the next session included in the lead-in area of the session ;
Means for determining whether or not a position from which the reading means reads data exists between the first address and the second address;
When the position where the reading means reads data is between the first address and the second address, it is determined whether the position where the reading means reads the data is a lead-in area or a lead-out area Area judging means to perform,
Session determining means for determining that the next session does not exist when it is determined that the area determining means is not a lead-in area or a lead-out area ;
When the area determining unit determines that the position where the reading unit reads data is the lead-out area, the area determining unit determines again after changing the position where the reading unit reads data;
If the position where the reading means reads data does not exist between the first address and the second address, the reading means changes the position where the data is read, and the reading means reads the data,
A disc reproducing apparatus in which the reading means ends reading of the data when the session determining means determines that the next session does not exist . 2. The disc reproducing apparatus according to claim 1 , wherein when the area determining unit determines that a position where the reading unit reads data is a lead-in area, the reading unit reads data in the lead-in area.

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