JP2003346422A - Optical disk device, reproducing method, program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reproduce an MP3 file and to play a copyright protection disk on a music only player. <P>SOLUTION: Determination is made as to whether audio data is continuously recorded or not from the head address of a data area adjacent to management data recorded on the innermost periphery of an optical disk (F106) and, in accordance with the result of the determination, access is made to the head address of the data area to reproduce audio data irrespective of the contents of the management data recorded on the innermost periphery of the optical disk (F107). Thus, a music file such as the MP3 file of a CD-ROM format or the like is reproduced, and even a copyright protection disk 2 which is made unreproducible by a CD-ROM drive or the like is played. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus for reproducing an optical disk, a reproducing method, a program for realizing the reproducing method, and a recording medium on which the program is recorded.

[0002]

2. Description of the Related Art For example, a music CD-DA (Compact Disc)
Digital Audio) and DVD (DigitalVersatile Disc)
Music, etc. sold on disk media such as, etc., is illegal (excluding private reproduction) unless authorized by the copyright owner. However, in recent years, CD
-R, CD-RW, DVD-RAM, DVD-R, DV
2. Description of the Related Art Writable disks using a dye change method or a phase change method, such as D-RW and DVD + RW, have become widespread, and there are situations in which copying can be easily performed on the user side. Further, a disk drive device built in (or connected to) a personal computer or the like, for example, a CD-ROM drive or a DVD
The drive is capable of recording and reproducing in correspondence with various types of disks of the CD system and the DVD system, and is capable of reproducing at a high speed such as, for example, 8 × speed, 16 × speed, and 40 × speed.

At present, CD players and the like sold as audio products incorporate a copyright protection function called SCMS, and usually allow only one copy at 1 × speed reproduction. However, a disk drive device (CD-ROM drive) having a built-in personal computer or a peripheral device does not incorporate such a copyright protection function, and allows virtually unlimited copying. Furthermore, in recent years, it has become a standard that a CD-ROM drive built in or connected to a personal computer can record on CD-R and CD-RW. Of course, DVD,
Supporting DVD-R and the like is almost standard.

[0004] For this reason, it is easy and short for music data recorded on a music CD (CD-DA) or the like to be captured on a hard disk using a personal computer, for example, and copied and recorded on a medium such as a CD-R. The situation can be done in time. In particular, the fact that high-speed recording / reproduction on an optical disc enables duplication in a short period of time is convenient for illegal traders who sell duplicate discs. I will.

[0005] For this reason, various types of disk media have been developed which can be played back by a music-only player but cannot be played back by a CD-ROM drive. Hereinafter, such a disk medium will be referred to as a "copyright protected disk" for explanation.

[0006]

A copyright-protected disk is made to be unplayable by a CD-ROM drive (at least music content that requires copyright protection cannot be played) due to the above circumstances. On the other hand, in some cases, even a player dedicated to music cannot be reproduced.

For example, in recent years, MP3 (MPEG Audio Layer
3) A CD-ROM format disc in which audio data is recorded in the form of a file is known, and can be reproduced by a CD-ROM drive. It is required that such a disc can be reproduced by a music-only player (such as a CD player). In this case, the CD player needs to have a CD-ROM disc decoding function. In other words, the internal configuration of the CD player needs to be substantially the same as that of the CD-ROM drive. This enables audio reproduction as an MP3 file.

[0008] In that case, however, a music-only CD
Even though it is a player, a copyright protected disc cannot be reproduced. Copyright protected discs are CDs
By utilizing the difference in the processing method for a disc between a player and a CD-ROM drive, it is possible to make it impossible to reproduce only with a CD-ROM drive. However, CD
-The same processing method as that of the CD-ROM drive is required for reproducing the MP3 file in the ROM format.
When a processing method similar to that of the CD-ROM drive is performed, if a copyright protection disk is loaded, reproduction becomes impossible due to the processing method.

In other words, even if it is a copyright-protected disk, it is impossible to perform the reproduction that should be originally permitted, which deteriorates the usability of the user.

[0010]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a method for reproducing music data in a CD-ROM format, such as an MP3 file, in an optical disk device dedicated to audio.
It is another object of the present invention to make it possible to reproduce a copyright-protected disc, thereby preventing the usability of the user from deteriorating.

[0011] An optical disk apparatus according to the present invention comprises a determining means for determining whether or not audio data is continuously recorded from a head address of a data area adjacent to management data recorded on the innermost circumference of the optical disk; An access unit for accessing a head address of the data area irrespective of the content of the management data recorded on the innermost circumference of the optical disk in accordance with a determination result of the determination unit. Further, the determination means makes a determination based on identification information in data recorded in the data area. In addition, when the management data includes multi-session disc identification data, the determination unit performs determination based on identification information in data recorded in the data area. The determining means performs the determination by detecting an abnormal state of the management data. In this case, the determination unit detects an address of another management data included in the management data recorded on the innermost circumference of the optical disc, and based on the address of the management data and the address of the other management data. Detect an abnormal state.

According to the reproducing method of the present invention, it is determined whether or not audio data is continuously recorded from a head address of a data area adjacent to management data recorded on the innermost circumference of an optical disc, and the result of the determination is determined. Accordingly, regardless of the content of the management data recorded on the innermost circumference of the optical disc, the head address of the data area is accessed to reproduce the audio data. Here, the determination is performed based on identification information in data recorded in the data area. When multi-session disc identification data is included in the management data, a determination is made based on identification information in the data recorded in the data area. The above determination is
This is performed by detecting an abnormal state of the management data. Further, the abnormal state is detected based on an address of another management data included in the management data recorded on the innermost circumference of the optical disc, and based on the address of the management data and the address of the other management data. I do.

A program according to the present invention is a program for realizing the above-mentioned reproducing method, and a recording medium according to the present invention is a recording medium recording the program according to the present invention.

For example, a CD-type disc is originally a CD-
It has been developed as DA (CD-Digital Audio: music CD), and its format as audio data and management information for its reproduction has been defined. After that, CD-ROM, CD-I, video C
A disk known as D or the like was developed and
Recordable discs such as DR and CD-RW have also been developed. When these new disks were developed, management information for data reproduction was expanded and standardized in conformity with the management information (TOC) format of CD-DA. Here, a playback device (CD player) dedicated to audio only needs to recognize at least management information on audio data of CD-DA, and thus does not support some extended management information. On the other hand, in a reproducing apparatus corresponding to various disks such as a CD-ROM drive for a computer, various types of extended management information are also recognized and corresponding processing is executed. In the case of a copyright-protected disc, in order to prevent reproduction on a CD-ROM drive capable of high-speed copying and the like, the above-described difference in correspondence regarding management information is used.

In such a situation, a music-only CD
For example, MP
To make it possible to play back three files and to play back a copyright protected disc, the head address of the data area is accessed and the audio data is played back regardless of the contents of the management data recorded on the innermost circumference of the optical disc. What should I do?

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an optical disk device (reproducing device) and a reproducing method according to an embodiment of the present invention will be described. Note that the optical disk device of the present embodiment is a general C
This is a music-only reproduction device similar to the D player, and is not a so-called CD-ROM drive connected to a personal computer or the like. For the sake of explanation, the optical disk device of the present embodiment will be referred to as an “audio player”. The description will be made in the following order. 1. 1. Configuration of audio player 2. Subcode and TOC Processing example [A] Processing example [B] Processing example [C]

1. Configuration of Audio Player The audio player of this example is basically a CD-DA
(Or a CD-ROM with audio data already recorded)
R, CD-RW, etc., which is a CD player for playing CD-type audio discs, but also for playing CD-ROM format audio files using CD-ROM technology. CD-ROM here
The technology can read the TOC of a multi-session disc. SVD, which is management information in CD-ROM format
(Secondary Volume Discripter) / PVD (Primary Vo
It can read information of lume descriptors. It means that compressed audio (MP3 etc.) recorded in CD-ROM format can be played. It is a device dedicated to music reproduction, and cannot perform operations that may infringe copyright, such as high-speed ripping to a personal computer or the like. In other words, it is a device that should be allowed to play on a copyright protected disk. In this example, the audio player can output only analog output such as line out (or headphone out) and optical digital audio output (1 × speed output). That is, it is the same as the conventional CD player.

FIG. 1 shows the configuration of the audio player 100. In the audio player 100 shown in FIG. 1, the disc 90 is loaded on the turntable 7, and is rotated at a constant linear velocity (CLV) or a constant angular velocity (CAV) by the spindle motor 6 during reproduction. Then, the pit data (emboss pit, dye change pit, phase change pit) recorded on the track on the disk 90 is read by the optical pickup 1.

In the pickup 1, a laser diode 4 serving as a laser light source, a photodetector 5 for detecting reflected light, an objective lens 2 serving as an output end of the laser light,
An optical system (not shown) for irradiating the laser beam to the signal surface of the disk 1 via the objective lens 2 and guiding the reflected light to the photodetector 5 is formed. A monitor detector 22 for receiving a part of the output light from the laser diode 4 is also provided.

The objective lens 2 is held by a biaxial mechanism 3 so as to be movable in a tracking direction and a focusing direction. The entire pickup 1 can be moved in the disk radial direction by a thread mechanism 8. The laser diode 4 in the pickup 1 is driven to emit laser light by a drive signal (drive current) from a laser driver 18.

The information of the reflected light from the disk 90 is detected by the photodetector 5, converted into an electric signal corresponding to the amount of received light, and supplied to the matrix circuit 9. The matrix circuit 9 includes a current-voltage conversion circuit, a matrix operation / amplification circuit, and the like corresponding to output currents from a plurality of light receiving elements as the photodetector 5, and generates necessary signals by matrix operation processing. For example, a reproduction data signal, a focus error signal FE for servo control, a tracking error signal TE, and the like are generated.

The reproduced data signal output from the matrix circuit 9 is sent to the binarization circuit 11 to output the focus error signal F
E, the tracking error signal TE is sent to the servo circuit 14,
Supplied respectively. The reproduction data signal obtained by the matrix circuit 9 is binarized by the binarization circuit 11 and supplied to the decoding unit 12. The decoding section 12 performs processing such as EFM demodulation processing, error correction processing, and deinterleaving as decoding processing to obtain reproduced audio data. In addition, decoding processing (CD-ROM decoding) corresponding to the CD-ROM format is also performed. For example, CD
-CD when playing MP3 files in ROM format
-Reproduce audio data by performing ROM decoding. At the time of reproduction, the decoding unit 12 generates a reproduction clock synchronized with the reproduction data signal by a PLL process, and executes the decoding process based on the reproduction clock.

By the decoding process in the decoding unit 12,
The linear PCM audio data is output. The linear PCM audio data is converted into an analog audio signal by the A / D converter 21, amplified and other necessary processing is performed by the analog output processing unit 32, and the analog output signal Aou is output.
Output as t. For example, it is a line output or a headphone output. Note that a speaker unit may be provided so that sound is output from the speaker.

The decoded PCM audio data is subjected to necessary formatting processing for digital transmission in a digital output processing unit 156, and is output as a digital output signal Dout. In the above-described reproducing operation, usually, only 1 × speed reproduction is possible.

APC circuit (Auto Power Control) 19
Is a circuit section for controlling the laser output power to be constant regardless of the temperature while monitoring the laser output power by the output of the monitor detector 22 during reproduction. The target value of the laser output is given from the system controller 10, and the laser driver 1 is controlled so that the laser output level from the laser diode 4 becomes the target value.
8 is controlled.

The servo circuit 14 generates various servo drive signals for focus, tracking, and sled from the focus error signal FE and the tracking error signal TE from the matrix circuit 9, and executes a servo operation.
That is, a focus drive signal FD and a tracking drive signal TD are generated according to the focus error signal FE and the tracking error signal TE, and supplied to the two-axis driver 16. The two-axis driver 16 drives the focus coil and the tracking coil of the two-axis mechanism 3 in the pickup 1. Thus, the pickup 1, the matrix circuit 9, the servo processor 14, the two-axis driver 1
6. A tracking servo loop and a focus servo loop by the two-axis mechanism 3 are formed.

The servo circuit 14 turns off the tracking servo loop in response to a track jump command from the system controller 10 and outputs a jump drive signal to the two-axis driver 16 to execute a track jump operation. .

The servo circuit 14 generates a thread drive signal based on a thread error signal obtained as a low-frequency component of the tracking error signal TE and an access execution control from the system controller 10 and supplies the thread drive signal to the thread driver 15. . The thread driver 15 drives the thread mechanism 8 according to a thread drive signal. Although not shown, the sled mechanism 8 has a mechanism including a main shaft for holding the pickup 1, a sled motor, a transmission gear, and the like. The sled driver 15 drives the sled motor 8 in accordance with a sled drive signal, so that the pick-up is performed. One required slide movement is performed.

The spindle servo circuit 13 controls the spindle motor 6 to rotate, for example, at CLV. The spindle servo circuit 13 controls the decoding unit 12 during reproduction.
The reproduction clock (clock serving as a reference for the decoding process) generated by the PLL in the above is obtained as the current rotation speed information of the spindle motor 6, and this is compared with predetermined CLV reference speed information to obtain the spindle error signal SPE.
Generate Then, the spindle servo circuit 13 supplies the spindle motor driver 17 with a spindle drive signal generated according to the spindle error signal SPE. The spindle motor driver 17 applies, for example, a three-phase drive signal to the spindle motor 6 according to the spindle drive signal, and executes the CLV rotation of the spindle motor 6. The spindle servo circuit 13 generates a spindle drive signal in accordance with a spindle kick / brake control signal from the system controller 10, and outputs a spindle motor signal from the spindle motor driver 17.
Also, operations such as start, stop, acceleration, and deceleration are executed.

The various operations of the servo system and the reproduction system as described above are controlled by a system controller 10 formed by a microcomputer. At the time of reproduction, an absolute address and a relative address as subcode Q data to be described later are read by the decoding unit 12, and the system controller 10 performs operation control based on these address information. When the disc is loaded, the system controller 10 controls each unit to read out the TOC information from the disc, receives the TOC information from the decoding unit 12, and stores it in the internal RAM. As a result, the system controller 10 obtains track management information recorded on the disk 90.

The operation section 19 is provided with various necessary operation elements such as operation keys and a jog dial for user operation. The user performs operations such as reproduction, fast forward, fast rewind, search for a cue, pause, stop, and the like, using the operators of the operation unit 19. The operation information is supplied to the system controller 10, and the system controller 10 controls each unit so that a predetermined operation is performed based on the operation information.

The display section 20 displays operation states such as reproduction and pause, and time information such as reproduction progress time. The system controller 10 supplies display data to the display unit 20 in accordance with the operation state, and executes a required display.

2. Subcode and TOC The TOC and the subcode recorded in the lead-in area on the CD format disc will be described. The minimum unit of data recorded on a CD disk is one frame. One block is composed of 98 frames.

The structure of one frame is as shown in FIG. 1
The frame is composed of 588 bits. The first 24 bits are used as synchronization data, and the following 14 bits are used as a subcode data area. After that, data and parity are allocated.

One block is composed of 98 frames, and the subcode data extracted from the 98 frames are collected to form one block of subcode data (subcoding frame) as shown in FIG. ) Is formed. First and second frames at the beginning of 98 frames (frame 98n + 1, frame 98n + 2)
Is a synchronization pattern.
Then, from the third frame to the 98th frame (frame 9
8n + 3 to frame 98n + 98), each of which has 96 bits of channel data, that is, P, Q, R, S, T, U,
V and W subcode data are formed.

Of these, P for managing access, etc.
Channel and Q channel are used. However, the P channel only indicates a pause portion between tracks, and the finer control is performed on the Q channel (Q1 to Q1).
Q96). The 96-bit Q channel data is configured as shown in FIG.

First, four bits Q1 to Q4 are used as control data, and are used for discrimination of the number of audio channels, emphasis, CD-ROM, whether digital copying is possible, and the like. That is, the following contents are indicated by the four bits. 0000: 2-channel audio without pre-emphasis 1000: 4-channel audio without pre-emphasis 0001: 2-channel audio with pre-emphasis 1001: 4-channel audio with pre-emphasis 0100: data track (CD-ROM)

Next, the four bits Q5 to Q8 are set to ADR, which indicates the mode of the sub-Q data. Specifically, the mode (sub-Q data content) is expressed by the four bits of ADR as follows. 0000: Mode 0: Sub-Q data is basically all zero (used in CD-RW) 0001: Mode 1 ... Normal mode 0010: Mode 2 ... Disc catalog number 0011: Mode 3 ..ISRC (International Standa
rd Recording Code) 0100: Mode 4 ... Used for CD-V 0101: Mode 5 ... CD-R, CD-RW, CD
-Used in multi-session systems such as EXTRA

The 72 bits Q9 to Q80 following the ADR are used as sub-Q data, and the remaining Q81 to Q96 are CR bits.
C.

The address is expressed by the sub-Q data when the mode 1 is indicated by the ADR. ADR = sub Q data and TOC in mode 1
The structure will be described with reference to FIGS. In the lead-in area of the disc, the sub-Q data recorded therein becomes the TOC information. The sub-Q data of 72 bits Q9 to Q80 in the Q channel data read from the lead-in area has information as shown in FIG. FIG. 4A corresponds to the structure of FIG. 3B in the lead-in area.
This shows a 2-bit sub Q data portion in detail. The sub-Q data has 8-bit data, and the TOC
Express information.

First, a track number (TNO) is recorded with eight bits Q9 to Q16. In the lead-in area, the track number is fixed to “00”. Then Q17 ~
POINT (point) is described by 8 bits of Q24. Q25-Q32, Q33-Q40, Q41-Q48
MIN (minute), SEC (second), FRAME (frame) as the absolute time in the lead-in area
Is shown. Q49 to Q56 are ZERO (= “0000
0000 ”). Furthermore, Q57 to Q64, Q6
8 bits each for Q5 to Q72 and Q73 to Q80, PMI
N, PSEC and PFRAME are recorded.
The meanings of IN, PSEC, and PFRAME are determined by the value of POINT.

FIG. 5 shows a case where ADR = “1” and ADR =
The information content in the case of "5" is shown.
Attention is paid to the case where R = “1” (normal mode). ADR
= “1”, the value of POINT is “01” to “99”
, The value of the POINT means the track number. In this case, in PMIN, PSEC, and PFRAME, the start point (absolute time address) of the track of the track number is minute (PMIN), second (PSE).
C), frame (PFRAME).

When the value of POINT is "A0", PM
The track number of the first track is recorded in IN.
The session format is indicated by the value of PSEC, and CD-DA (digital audio), CD-DA
Specifications such as I and CD-ROM (XA specification) are distinguished. When the value of POINT is “A1”, the track number of the last track is recorded in PMIN. POI
When the value of NT is “A2”, PMIN, PSEC, P
In the FRAME, the start point of the lead-out area is an absolute time address (minute (PMIN), second (PSEC),
(PFRAME).

In a normal CD-DA, only the information in the case of ADR = "1" as described above is recorded as the TOC by the subcode. For example, in the case of a disc on which six tracks are recorded, data is recorded as a TOC based on such sub-Q data as shown in FIG. That is, since it is TOC, the track numbers TNO are all "00" as shown in the figure. Block N
O. Is 1 that is read as 98-frame block data (sub-coding frame) as described above.
It shows the number of the sub Q data of the unit. Each TOC data has the same contents written over three blocks. As shown, POINT ranges from "01" to "0".
In the case of "6", start points of the first track # 1 to the sixth track # 6 are indicated as PMIN, PSEC, and PFRAME.

When POINT is "A0", PM
IN indicates “01” as the first track number. The disc is identified by the value of PSEC, and is "00" in the case of a normal audio CD. When the disc is a CD-ROM (XA specification), the PS
EC = “20”, PSEC = “10” for CD-I
It is defined as:

When the value of POINT is "A1", P
The track number of the last track is recorded in MIN,
When the value of POINT is “A2”, PMIN, PSE
C, PFRAME indicate the start point of the lead-out area. After block n + 27, block n
.. N + 26 are repeatedly recorded.

In the example of FIG. 6, the number of recording tracks is six and the value of POINT is "A".
This merely shows the case of a normal CD-DA in which blocks “0”, “A1”, and “A2” exist. Actually, ADR = "1", for example, ADR = "1" shown in FIG.
In the mode “5”, information corresponding to various values of POINT may be provided, and the number of tracks managed by TOC also differs depending on the disc. Therefore, one unit as TOC data is 27 units as shown in FIG.
It is not fixed to a block.

As described above, ADR = "5" is defined as information used in a multi-session disc. That is, in the case of a multi-session disc,
Information in which ADR = "5" shown in FIG. 5 is added to the TOC information as shown in FIG.

FIG. 5 shows information when ADR = "5" added to a multi-session disc. In the mode of ADR = “5”, POINT = “B
In the case of "0", the absolute time address at which the next session starts is indicated as MIN, SEC, FRAME as minutes / seconds / frame. PMIN, PSEC, PFRAM
As E, the absolute time address at which the lead-out of the next session starts is indicated as minutes / seconds / frame.

POI in the mode of ADR = "5"
NT = “C0” functions as an ID code indicating that the disc is a multisession disc. In this case, M
IN, SEC, FRAME are all "00000000
0 ", and fixed values" 95h "," 00h ", and" 00h "for PMIN, PSEC, and PFRAME.
POINT in the mode of such ADR = "5"
The information set as “B0” and “C0” as the value of “” functions as multi-session information.

In addition to the above multi-session information, skip information is also defined in the mode of ADR = "5". The skip information is instruction information for instructing the reproduction of a certain track or section (interval) to be skipped (not to be reproduced). The skip information includes “B” as the value of POINT at ADR = “5”.
1, "B2", "B3", "B4", "01" to "40" are defined.

When POINT = “B1”, the number of skip interval pointers is indicated in PMIN (maximum of 4).
0). Also, the number of skip tracks is indicated in the PSEC (maximum 21). POINT = “B2” “B3” “B4”
Means MIN, SEC, FRAME, ZERO, PMI
Each area of N, PSEC, and PFRAME is used as an area indicating a track number to be skipped.
Therefore, up to 21 tracks can be designated as skip tracks. The number of skip tracks specified here is indicated in the PSEC of POINT = “B1”.

Each of POINT "01" to "40" functions as a skip interval pointer. For example, when POINT = “01”, the absolute time address of the end position of the skip section is recorded in MIN, SEC, and FRAME as the first skip section, and PMIN,
The absolute time address of the start position of the skip section is recorded in PSEC and PFRAME. By defining POINT “01” to “40” as skip interval pointers, skip specification is possible for up to 40 sections (intervals). Then, the number of skip intervals specified by this is determined by the POIN
It is shown in PMIN of T = “B1”.

As described above, TOC data is formed by the subcode in the lead-in area of the disk.

On the other hand, in the program area and the lead-out area in which music is recorded as the first track to the n-th track, information as an absolute time address or relative time is recorded by the sub-Q data recorded therein. Is done. The subcode in this case has the information shown in FIG. FIG. 4 (b) corresponds to the structure of FIG. 3 (b) in the program area and the lead-out area, and specifically shows a 72-bit sub Q data portion in detail.

The control data of Q1 to Q4,
The ADR of Q5 to Q8 is the same as that in the above lead-in. Therefore, the control data of Q1 to Q4 becomes identification information of the number of audio channels, emphasis, CD-ROM, and whether or not digital copying is possible for each track.

In this case, as the data after Q9, first, the track number (TNO) is set to 8 bits Q9 to Q16.
Is recorded. That is, "01" is set for each of the tracks # 1 to #n.
~ 99. In the lead-out area, the track number is "AA". Then Q
An index is recorded by 8 bits of 17 to Q24.
The index is information that can further subdivide each track.

Q25 to Q32, Q33 to Q40, Q41
Each of the 8 bits of Q to Q48, MIN (minute), SEC as elapsed time (relative address / relative time) in the track
(Seconds) and FRAME (frame) are shown. Q49 ~
Q56 is set to ZERO (= "00000000"). Q57-Q64, Q65-Q72, Q73-Q80
Are set to AMIN, ASEC, and AFRAME, which are minute (AMIN), second (ASEC), and frame (AFRAM) as an absolute address (absolute time).
E). The absolute address is an address continuously added from the head of the first track (that is, the head of the program area) to the lead-out area.

3. Processing Example [A] The audio player 100 of the present example is a
In addition to being able to play back D-type audio discs, it is also possible to play back audio files in CD-ROM format such as MP3 files. Further, it is possible to reproduce even a copyright protected disk which cannot be reproduced from a CD-ROM drive. A processing example for this will be described below. As a copyright protected disk, several methods for prohibiting the reproduction thereof are known. Here, a method capable of supporting a copyright protected disk of a method called Media CloQ will be described as a processing example [A]. I do.

First, the Media CloQ method will be described.
FIG. 7A shows an example of the area of the copyright protection disk. As shown, the copyright protection disc is a multi-session disc having a first session and a second session. In the first session, a lead-in, a program area, and a lead-out are performed from the inner peripheral side. For example, tracks # 1 to #n are recorded in the program area. In the second session, the lead-in, program area,
Lead-out is performed, and for example, track # n + 1 is recorded in the program area.

Here, tracks # 1 to #n in the first session are normal CD-system audio data tracks, that is, music data of n pieces of music are recorded. The music data of these n pieces of music are contents requiring copyright protection. On the other hand, track # n + 1 in the second session is not music content having copyright protection. For example, copyright-free music data, text data, image data, and the like may be data that can be read by a CD-ROM drive and output by a personal computer or the like, or may be data without any content. And TO in the lead-in of the first session
As the C data, the management information of the tracks # 1 to #n is recorded as the information of ADR = mode 1 described above, and the information of ADR = mode 5 described in FIG.
A multi-session ID, absolute time information at which the next session starts, and the like are recorded.

A normal CD player does not recognize ADR = mode 5 information in TOC data. Therefore,
The disc is not recognized as a multi-session disc. Then, in order to perform the reproduction process by recognizing the management information of the tracks # 1 to #n as the information of ADR = mode 1,
As shown in FIG. 7B, following the TOC reading, the track #
1 to #n can be reproduced. On the other hand, CD-RO
The M drive processes the disc as a multisession disc in order to recognize the multisession information in the TOC data. For a multi-session disc, it is specified that the TOC is sequentially read to the outer peripheral side.
Access is performed based on the absolute time information of the start of the next session recorded in the C data. That is, as shown in FIG. 7C, the user accesses the lead-in of the second session and reads the management information. In this case, since the SVD / PVD is recorded as the management information of the track # n + 1 in the lead-in of the second session, the track # n + 1 can be reproduced based on the SVD / PVD. That is, CD-
For the ROM drive, only the data on track # n + 1 can be validated and reproduced, and tracks # 1 to #n in the first session cannot be reproduced.

That is, in such a copyright-protected disc, the reproduction of the copyright-protected content cannot be performed by utilizing the fact that the CD-ROM drive supports the information of ADR = mode 5 of the TOC data. is there.
On the other hand, considering the audio player 100 of this example, C
D-ROM format audio file (MP3
In order to enable reproduction of files, the decoding unit 12 has a CD-ROM decoding function, and the system controller 10 also recognizes ADR = mode 5 information of TOC data. Therefore, CD-
As in the case of the ROM drive, the tracks # 1 to #n which are the copyright protected contents in the first session cannot be reproduced. The audio player 100 is not used for ripping to a personal computer or the like, and normal reproduction of a copyright protected disc should be permitted. Will be inhibited. Therefore, the audio player 100 of the present embodiment performs the processing as shown in FIG. 8 so that the copyright protected disc can be normally reproduced.

FIG. 8 shows a control process by the system controller 10 when the disc 90 is loaded in the audio player 100. When the disk 90 is loaded, the system controller 10 instructs the servo circuit 14, the spindle servo circuit 13, and the decoding unit 12 to perform a reproducing operation in step F101, and moves the pickup 1 to the innermost peripheral lead-in area of the disk. To reproduce the TOC data on the disc 90.
The system controller 10 receives TOC data from the decoding unit 12 as a subcode in the lead-in area.

After reading the TOC data, the system controller 10 determines the information of the first track recorded as the TOC data in step F102, and records the information from the first track, that is, the beginning of the program area following the lead-in area of the disk 90. Check the type of data being stored. Specifically, it is determined whether or not data in the CD-ROM format is recorded as the first track of the program area. In this determination, FIG.
With reference to the control data of the subcodes Q1 to Q4 shown in FIG.
M) ”or“ audio data ”. Note that the AD shown in FIG.
R = “PSE” of POINT “A0” in mode 1
The session format which is the value of “C” may be confirmed.

If it is confirmed that the value is a value indicating "audio data", the process proceeds to step F103, where the loaded disc is a CD-DA (or a CD-R in which music data is already recorded). Etc.)
The operation shifts to the reproduction operation from the first track.

On the other hand, if it is determined in step F102 that the data track is a "data track (CD-ROM)",
At 104, it is confirmed whether or not the disc is a multi-session disc. That is, the multi-session information of POINT “B0” and “C0” in ADR = mode 5 described with reference to FIG. If there is no multi-session information and it is determined that the disc is a single-session disc,
Proceeding to step F110, the loaded disc is
Judge as a D-ROM. In the case of a CD-ROM, the system controller 10 plays back the SVD / PVD, analyzes it, and grasps the file structure. Then, the process proceeds to step F111 to determine whether there is a valid file that can be reproduced. The audio player of this example is C
It can play back audio files such as MP3 files in the D-ROM format. Therefore,
This is to check whether an audio file exists. If no audio file is recorded on the CD-ROM disk, it is determined that there is no valid playback file, and the process proceeds to step F112.
"FILE" is displayed to notify the user, and the reproduction process ends. For example, the audio player 100 may eject the disc on the assumption that the disc is not compatible. On the other hand, if a reproducible audio file such as an MP3 file has been recorded, the process proceeds to step F113 and proceeds to the MP3 file reproduction process.

If it is determined in step F104 that the disc is a multi-session disc, the loaded disc 90 is
A D-ROM disc may be a multi-session disc, or a copyright protection disc. Therefore, in step F105, the first track is accessed, and in step F106, the first track is reproduced to check the subcode data. Disc 90 is a CD-R
If the disc is an OM disc, the subcode data in the first track includes Q1 to Q shown in FIG.
4 is "Data Track (CD-R
OM) ”.

When a value indicating "data track (CD-ROM)" is detected from the subcode also in the head track, it can be determined that the disc is a multisession disc as an original CD-ROM disc. Then, the process proceeds to step F108 to access the lead-in of the second session based on the absolute time (absolute address) of the next session described in the TOC data. If the second session is not the last session, the absolute time (absolute address) of the next session is recorded as the TOC data in the lead-in of the second session, so that the lead-in area of the next session is accessed. . That is, access is sequentially advanced to the lead-in area of the valid last session.

When the effective final session is reached, the system controller 10 reproduces the SVD / PVD, analyzes it, and grasps the file structure. Then, the process proceeds to step F111 to determine whether there is a valid file that can be reproduced. That is, it is confirmed whether an audio file exists. If no audio file is recorded on the CD-ROM disc, the process proceeds to step F112 assuming that there is no reproduction valid file, and displays "NO FILE" on the display unit 20 to notify the user, for example, and ends the reproduction process. . If a playable audio file such as an MP3 file is recorded,
Proceed to step F113 to set M
The process proceeds to the reproduction process of the P3 file.

In the case of a copyright-protected disc, as described above, the originally valid tracks # 1 to #n as audio data are recorded in the first session, but the TOC data indicates that the disc is a multi-session disc. In this way, during reproduction by the disk drive device, the second session is accessed so that the tracks # 1 to #n of the first session cannot be reproduced. Here, the first track of the first session is accessed in step F105, and the subcode data is confirmed in step F106.
Since 1) is an audio data track, the control data of the subcodes Q1 to Q4 has a value indicating “audio data”. That is, it is determined that audio data is recorded in a program area adjacent to the lead-in area in which TOC data is recorded.

In this case, the system controller 10 proceeds to step F107 and determines that the loaded disk is a copyright protected disk. And this is CD-DA
Since the audio track is recorded in the same manner as in the above, the multi-session information in the TOC data is ignored, and the processing shifts to the reproduction process from the first track (track # 1) of the first session.

By performing the above processing, the reproduction operation by the audio player 100 is performed as shown in FIGS.
(G) is as schematically shown. First, when a single-session CD-DA, that is, a normal music CD is loaded (a disc in which the second session does not exist as shown in FIG. 7A), in step F103, as shown in FIG. The tracks # 1 to #n recorded in the program area are reproduced based on the data.

As shown in FIG. 7E, when a single-session CD-ROM disc (a disc without the second session shown in FIG. 7A) is loaded, an MP3 file is recorded. If so, step F
In the process of 110 → F111 → F113, the MP3 file recorded in the program area is reproduced. If no reproducible audio file such as an MP3 file is recorded, steps F110 → F111 →
No reproduction is performed in the process of F112.

As shown in FIG. 7 (f), when a multi-session CD-ROM disc is loaded, if an MP3 file is recorded in the last session, steps F108 → F109 → F111 → F113
, The MP3 file recorded in the program area of the last session is reproduced. If no reproducible audio file such as an MP3 file is recorded in the final session, steps F108 → F10
No reproduction is performed in the processing of 9 → F111 → F112.

When the copyright protected disk described in FIG. 7A is loaded, it can be determined in steps F105 and F106 that the disk is a copyright protected disk. That is, FIG.
As shown in (g), the first track is accessed to check the subcode data, and if it is determined that the disk is a copyright protected disk, an audio track (CD format data) in the program area of the first session is determined in step F107. Is executed.

As can be seen from the above, according to the audio player 100 of the present embodiment, music playback is performed not only for a CD-DA disk but also for a CD-ROM disk on which audio files in a CD-ROM format are recorded. Can be performed, and the copyright protected disc can be normally reproduced. by this,
User usability can be improved.

4. Processing Example [B] As a copyright protection disk, a method called Key2Audio is also known in addition to Media CloQ. This Key
A processing example [B] corresponding to the 2Audio system will be described. First, Ke
The y2Audio system will be described with reference to FIG. FIG. 9A shows an example of the area of the copyright protection disk. As shown in the figure, also in this case, the copyright protection disc is a multi-session disc having a first session and a second session.
However, it is only necessary that the second session is logically a multi-session disc on the TOC data, and the second session may not be actually formed. The first session includes a lead-in, a program area, and a lead-out from the inner peripheral side.
~ # N are recorded. Tracks # 1 to #n in the first session are audio data tracks of a normal CD system, that is, music data of n pieces of music are recorded. The music data of these n pieces of music are contents requiring copyright protection.

When the second session is actually provided, a lead-in, a program area, and a lead-out are performed from the inner peripheral side. For example, track # n + 1 is recorded in the program area. However, there is no need to actually record valid data as track # n + 1.

As the TOC data in the lead-in of the first session, the management information of the tracks # 1 to #n is recorded as the information of ADR = mode 1 described above, and the information of ADR = mode 5 is recorded as the information of ADR = mode 5. The multi-session ID and the absolute time information at which the next session starts, as described in 5, are recorded. Here, as shown in FIG. 5, ADR = POINT “B0” in mode 5
In, the start position of the next session is indicated as an absolute time address. In this case, this value is an abnormal value. Specifically, where the address of the lead-in area of the second session of the main body is to be recorded, the start address of the lead-in area of the first session or an address in the vicinity thereof is recorded.

A normal CD player does not recognize ADR = mode 5 information in TOC data. Therefore,
The disc is not recognized as a multi-session disc. Then, in order to perform the reproduction process by recognizing the management information of the tracks # 1 to #n as the information of ADR = mode 1,
As shown in FIG. 9B, following the TOC reading, the track #
1 to #n can be reproduced.

On the other hand, in the CD-ROM drive, TOC
To recognize multi-session information in data,
The disc is processed as a multi-session disc. For multi-session discs, T
Since it is specified that OCs are sequentially read,
The CD-ROM drive accesses based on the absolute time information of the start of the next session recorded in the TOC data. However, in this case, the absolute time information at which the next session starts is an abnormal value, and as a result, FIG.
As shown in (c), the user accesses the lead-in area of the first session. And in that case,
Since the start position of the next session is recorded in the TOC data in the lead-in area, access is made again. That is, access to the lead-in area of the first session is repeated indefinitely. Therefore CD
-For the ROM drive, the final session cannot be reached forever and a timeout error occurs at some point, so tracks # 1 to ## in the first session
n cannot be reproduced.

That is, also in this case, the copyright-protected disk is designed to prevent the reproduction of the copyright-protected content by utilizing the fact that the CD-ROM drive supports the information of ADR = mode 5 of the TOC data. It is.

Such a copyright protected disk and a CD-
CD-ROM with DA and audio files
FIG. 10 shows a process (process example [B]) of the audio player 100 of the present example for enabling the reproduction of.

FIG. 10 shows a control process by the system controller 10 when the disc 90 is loaded in the audio player 100, similarly to FIG. In addition,
Steps F201 to F204 and F208 to F2 in FIG.
13 corresponds to steps F101 to F104 and F108 in FIG.
Since this is the same as F113, the detailed description is omitted.

When the disk 90 is loaded, the system controller 10 reads the TOC data in the innermost lead-in area in step F201. Then, the information of the first track, that is, the subcode Q shown in FIG.
It is determined whether the values of the control data 1 to Q4 indicate "data track (CD-ROM)" or "audio data". And "audio data"
If it is confirmed that the disc is loaded, the process proceeds to step F203, where it is determined that the loaded disc is a CD-DA (or a CD-R or the like in which music data is already recorded), and reproduction from the first track is performed. Move to operation.

In step F202, “data track (C
D-ROM) "in step F204.
ADR of TOC data = POIN as mode 5
Check the multi-session information of T “B0” and “C0”
Check whether the disc is a multi-session disc. If there is no multi-session information and it is determined that the disc is a single-session disc, the process proceeds to step F210, and it is determined that the loaded disc is a CD-ROM. In this case, similarly to the process described with reference to FIG. 8, the process proceeds to steps F210 → F211 → F213, and M
The playback of the audio file such as P3 is performed, or the process proceeds from step F210 to F211 to F212, and the playback process ends as a non-compliant disc.

If it is determined in step F204 that the disc is a multi-session disc, the loaded disc 90 is
A D-ROM disc may be a multi-session disc, or a copyright protection disc. In this case, in steps F205 and F206, T
The abnormality of the multi-session information in the OC is determined.
As described above, in the case of a copyright-protected disc, the start position address (absolute time) of the next session is set as the address of the lead-in area (or its vicinity) of the current session, and the infinite access is executed. I have. Therefore, in step F205, in the read TOC data, the absolute time address as the start position of the next session, which is indicated by POINT “B0” in ADR = mode 5, and the start time of the current lead-in area Compare absolute time addresses. Specifically, the address difference is detected by performing the present of both address values. Then, in a step F206, it is determined whether or not the data is abnormal data based on the address difference. By the above subtraction, the value of "minute: second: frame" as the address difference is calculated, but this address difference should be a certain large value. Conversely, if this address difference is very small, AD
It can be determined that the start position of the next session, indicated by POINT “B0” in R = mode 5, is an abnormal value. That is, it can be determined that the current address of the lead-in area is indicated for the purpose of executing the infinite repetitive access. For example, a case where the address difference is within 30 seconds (“0 minute 30 seconds 0 frame”) may be determined to be an abnormal value. Note that this “30 seconds” is an example, and may be another value.

If it is determined that the address difference is not within 30 seconds and the data is not abnormal, the process proceeds to step F208, and based on the absolute time (absolute address) of the next session described in the TOC data, the next session. Access the lead-in. If the second session is not the last session, the access to the lead-in area of the next session is further performed and the access is advanced to the lead-in area of the valid last session. Then, similarly to the processing described with reference to FIG. 8, the processing proceeds from step F209 to F211 to F213 to reproduce an audio file such as MP3 in the final session, or alternatively, steps F209 to F2.
The process proceeds from 11 to F212, and the reproduction process ends as a non-compliant disc.

If the address difference is within 30 seconds and it is determined in step F206 that the data is abnormal, the process proceeds to step F206.
Proceeding to 207, the loaded disc is determined to be a copyright protected disc. That is, in this method, an audio track is recorded in a program area adjacent to the lead-in area in which TOC data is recorded in the same manner as the CD-DA. For this reason, the process proceeds to the reproduction process from the first track (track # 1) of the first session, ignoring the multi-session information in the TOC data.

By performing the above processing, the reproduction operation by the audio player 100 is performed as shown in FIGS.
(G) is as schematically shown. If a single-session CD-DA, that is, a normal music CD is loaded (a disc without the second session shown in FIG. 9A), the TOC data is read in step F203 as shown in FIG. 9D. , The tracks # 1 to #n recorded in the program area are reproduced.

As shown in FIG. 9E, when a single-session CD-ROM disc (a disc having no second session shown in FIG. 9A) is loaded, an MP3 file is recorded. If so, step F
In the process of 210 → F211 → F213, the MP3 file recorded in the program area is reproduced. If no reproducible audio file such as an MP3 file is recorded, steps F210 → F211 →
No reproduction is performed in the process of F212.

As shown in FIG. 9F, when a multi-session CD-ROM disc is loaded, if an MP3 file is recorded in the last session, steps F208 → F209 → F211 → F213
, The MP3 file recorded in the program area of the last session is reproduced. If no reproducible audio file such as an MP3 file is recorded in the last session, steps F208 → F20
No reproduction is executed in the process of 9 → F211 → F212.

When the copyright protected disk described in FIG. 9A is loaded, it can be determined in steps F205 and F206 that the disk is a copyright protected disk. In this case, the reproduction of the audio track (data in the CD format) in the program area of the first session is executed as shown in FIG.

As can be seen from the above, according to the audio player 100 of the present embodiment, music playback is performed not only for a CD-DA disc but also for a CD-ROM disc on which audio files of a CD-ROM format are recorded. Can be performed, and the copyright protected disc can be normally reproduced. by this,
User usability can be improved.

As a modification of the processing example [B], the processing of steps F105 and F106 of the processing example [A] may be performed. That is, step F2
At 06, for example, if the address difference is within 30 seconds, it is determined that the data is abnormal. However, if the address difference is within 30 seconds, it is determined that there is a possibility of a copyright protected disk. At this point, the processing of steps F105 and F106 in FIG. 8 is performed to actually confirm the subcode data of the first track. Then, if the control data of Q1 to Q4 in the subcode data in the first track has a value indicating "audio data", it is determined that the disk is a copyright protection disk, and the process proceeds to step F207. On the other hand, in the subcode data of the first track, if the control data of Q1 to Q4 is a value indicating “data track (CD-ROM)”, the disc is determined to be a CD-ROM disc, and the process proceeds to step F208. is there.

[0097] 5. Processing Example [C] The above processing examples [A] and [B] are such that a disk drive device can reproduce a copyright protected disk utilizing the fact that it supports multi-session information, such as Media CloQ or Key2Audio. However, there is another method of preventing reproduction by a disk drive device in order to prevent ripping on a personal computer or the like. In that case,
A copyright protection disc as a single session disc is also conceivable.

Processing example [C] is an example in which a copyright protected disk as a multi-session disk can be handled as described above, and a copyright protected disk as a single session disk can be handled. FIG.
1, the audio player 1 as in FIGS.
The control processing by the system controller 10 when the disk 90 is loaded in 00 is shown.

When the disk 90 is loaded, the system controller 10 reads the TOC data in the innermost lead-in area in step F301. Subsequently, the head track of the first session is accessed in step F302, and subcode data is confirmed in step F303. Here, if the first track (track # 1) is an audio data track, the control data of the subcodes Q1 to Q4 has a value indicating “audio data”. In that case, the system controller 10 proceeds to step F304, and the loaded disc is a normal CD.
-Determine that the disc is either DA or a copyright protected disc. In any case, since the audio track is recorded in the CD-DA format in the program area adjacent to the lead-in area, the reproduction process starts from the first track (track # 1) of the first session.

If the subcodes Q1 to Q4 of the first track
Of the control data is "Data Track (CD-
ROM) ", the loaded disc is a CD
-Judge as a ROM disk. In that case, step F3
At 05, it is determined from the TOC data whether or not the disc is a multi-session disc. If it is a single session, steps F308, F309, F310, F311
(Steps F110, F111, F11 in FIG. 8)
2, the same processing as F113), the reproduction of the audio file or "NO FILE" ends. If the disc is a multi-session disc, steps F306 and F30
7, F309, F310, and F311 (steps F108, F109, F111, F112, and F11 in FIG. 8).
3) playback of an audio file or "N
"FILE".

That is, in the processing example [C], first, the subcode of the first track is confirmed to confirm whether or not the audio data track of the CD-DA system is recorded. If the audio data track is recorded, the reproduction of the audio data track is performed. On the other hand, if the first track is a data track, C
It is determined that the disc is a D-ROM disc, and if an audio file has been recorded, it is reproduced. Thus, according to the audio player 100 of the present embodiment, music can be played back not only on a CD-DA disc but also on a CD-ROM disc on which audio files in a CD-ROM format are recorded. Also, a copyright protected disc can be normally reproduced.

While the example of the embodiment has been described above,
The present invention is capable of various modifications. The audio player 100 according to the embodiment is capable of outputting a 1x speed reproduction audio signal as an analog signal or digital data as shown in FIG. This is based on the fact that the optical disk device of the present invention is a music-only player. In other words, this means that the apparatus is to be permitted to play the copyright protected disk, but the audio player 100 is not necessarily limited to such an output form. Functionally, for example, even if it is possible to provide data communication with a personal computer or another device by providing a wired interface such as USB or a wireless interface, if the copyright protection function is provided, the reproducing method of the present invention Can be adopted. For example, any device that cannot perform high-speed reproduction / transmission output for high-speed ripping may be used. Also,
In some cases, high-speed reproduction / transmission for high-speed ripping may be permitted due to authentication, user registration / charging, or the intention of the copyright holder. Therefore,
For example, when necessary procedures such as device authentication and user authentication have been performed, the above processing may enable the reproduction of the copyright protected disk.

The program of the present invention is a program for causing a reproducing apparatus such as the audio player 100 to execute the operation of the above-described reproducing method. The program can realize the optical disk device of the present invention. Further, according to the recording medium of the present invention on which such a program of the present invention is recorded, it is easy to provide a program for realizing the present invention, which is suitable for apparatus design and system construction. Recording media for recording the program include CD, DVD and MD optical disks, magneto-optical disks, magnetic disks such as flexible disks, HDDs (hard disk drives), and memory cards using solid-state memory. Can be realized by:

[0104]

As will be understood from the above description, according to the optical disk apparatus and the reproducing method of the present invention, audio data is continuously transmitted from the head address of the data area adjacent to the management data recorded on the innermost circumference of the optical disk. Discriminates whether or not the data is recorded on the optical disc and reproduces the audio data by accessing the head address of the data area regardless of the contents of the management data recorded on the innermost circumference of the optical disc according to the discrimination result. CD-RO
A music file such as an M format MP3 file can be reproduced, and a copyright protected disc which cannot be reproduced by a CD-ROM drive or the like can be reproduced.
In other words, a copyright-protected disk that is originally allowed to be played as a music-only player can be played back, so that the effect of not deteriorating the usability of the user can be obtained.

Further, the above determination can be made accurately by making the determination based on the identification information in the data recorded in the data area. When multi-session disc identification data is included in the management data, the discrimination based on the identification information in the data recorded in the data area is performed.
-It is possible to enable reproduction from a copyright protected disk which cannot be reproduced by a ROM drive. The determination is performed by detecting an abnormal state of the management data. For example, the abnormal state is detected based on the address of the other management data included in the management data recorded on the innermost circumference of the optical disc and based on the address of the management data and the address of the other management data. By doing so, the management information can be reproduced from a copyright protected disk which cannot be reproduced by the CD-ROM drive in an abnormal state.

Further, according to the program of the present invention or a recording medium on which the program is recorded, an optical disk device realizing the above-mentioned effects can be easily realized.

[Brief description of the drawings]

FIG. 1 is a block diagram of an audio player according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a frame structure of a CD system.

FIG. 3 is an explanatory diagram of a sub-coding frame of a CD system.

FIG. 4 is an explanatory diagram of subcode Q data.

FIG. 5 is an explanatory diagram of the contents of TOC data in the CD system.

FIG. 6 is an explanatory diagram of a TOC structure.

FIG. 7 shows processing [A] of the audio player according to the embodiment.
FIG.

FIG. 8 shows processing [A] of the audio player according to the embodiment.
It is a flowchart of FIG.

FIG. 9 shows a process [B] of the audio player according to the embodiment.
FIG.

FIG. 10 is a flowchart of a process [B] of the audio player according to the embodiment.

FIG. 11 is a flowchart of a process [C] of the audio player of the embodiment.

[Explanation of symbols]

1 Pickup, 2 Objective Lens, 6 Spindle Motor, 9 Matrix Circuit, 10 System Controller, 12 Decoding Unit, 21 A / D Converter

   ────────────────────────────────────────────────── ─── Continuation of front page    F term (reference) 5C052 AA02 AB05 AC10 CC01 DD06                 5C053 FA13 FA23 JA01 JA23 KA24                       KA25 KA26                 5D044 AB05 BC06 CC06 DE14 DE38                       DE49 DE53 FG18 GK08                 5D110 AA17 AA19 AA27 DA03 DA06                       DB03 DE01

Claims (20)

[Claims] 1. A discriminating means for discriminating whether or not audio data is continuously recorded from a head address of a data area adjacent to management data recorded on an innermost circumference of an optical disc, and a discrimination result of the discriminating means. An access unit for accessing a start address of the data area regardless of the content of management data recorded on the innermost circumference of the optical disk. 2. The optical disc apparatus according to claim 1, wherein said discriminating means makes a discrimination based on identification information in data recorded in said data area. 3. The apparatus according to claim 2, wherein said determining means makes a determination based on identification information in data recorded in said data area when said management data includes multi-session disc identification data. An optical disk device according to the above. 4. The optical disk device according to claim 1, wherein said determination means performs said determination by detecting an abnormal state of said management data. 5. The discriminating means detects an address of another management data included in management data recorded on an innermost circumference of the optical disk, and determines an address of the management data and an address of the other management data. The optical disk device according to claim 4, wherein an abnormal state is detected based on the detected state. 6. It is determined whether or not audio data is continuously recorded from a head address of a data area adjacent to management data recorded on an innermost circumference of the optical disc, and according to a result of the determination, the optical disc is determined. And reproducing audio data by accessing a head address of the data area irrespective of the content of management data recorded on the innermost circumference of the data area. 7. The reproducing method according to claim 6, wherein the determination is performed based on identification information in data recorded in the data area. 8. The reproducing method according to claim 7, wherein when the management data includes multi-session disc identification data, the discrimination is performed based on identification information in data recorded in the data area. 9. The reproducing method according to claim 6, wherein the determination is performed by detecting an abnormal state of the management data. 10. detecting an address of another management data included in management data recorded on an innermost circumference of the optical disk, and detecting the abnormality based on an address of the management data and an address of the other management data. The reproducing method according to claim 9, wherein a state is detected. 11. A determination is made as to whether audio data is continuously recorded from a start address of a data area adjacent to management data recorded on an innermost circumference of the optical disc, and according to a result of the determination, the optical disc is determined. A program for executing an operation of accessing the head address of the data area and reproducing the audio data irrespective of the content of the management data recorded on the innermost circumference of 12. The program according to claim 11, wherein the determination is made based on identification information in data recorded in the data area. 13. The program according to claim 12, wherein when the management data includes multi-session disc identification data, the discrimination is performed based on identification information in data recorded in the data area. 14. The program according to claim 11, wherein the determination is performed by detecting an abnormal state of the management data. 15. An address of another management data included in management data recorded on the innermost circumference of the optical disc, and the abnormality is detected based on the address of the management data and the address of the other management data. The program according to claim 14, wherein the state is detected. 16. It is determined whether or not audio data is continuously recorded from a start address of a data area adjacent to management data recorded on an innermost circumference of the optical disk, and according to a result of the determination, the optical disk. A recording medium on which a program for executing an operation of reproducing audio data by accessing a head address of the data area irrespective of the content of management data recorded on the innermost circumference of the recording medium. 17. The recording medium according to claim 16, wherein the program makes the determination based on identification information in data recorded in the data area. 18. The method according to claim 18, wherein when the management data includes multi-session disc identification data, the program performs a determination based on identification information in data recorded in the data area. Item 18. The recording medium according to Item 17. 19. The recording medium according to claim 16, wherein the program performs the determination by detecting an abnormal state of the management data. 20. The program detects an address of another management data included in management data recorded on an innermost circumference of the optical disk, and detects an address of the management data and an address of the other management data. Wherein the abnormal condition is detected.
10. The recording medium according to 9.