JP4129744B2 - Playback apparatus and playback method - Google Patents

Description

  The present invention relates to a playback apparatus and a playback method, and in particular, a playback apparatus that enables normal playback of data even when identification information indicating the type of data recorded on a recording medium is incorrect. And a reproduction method.

  In recent years, with the development of digital technology, for example, CD players as recording medium playback apparatuses that play back digital audio data recorded on a recording medium (media) such as a CD (Compact Disc) have become widespread. For example, the format of the digital audio data conforms to the uncompressed audio data such as CD-DA (Compact Disc Digital Audio) and the MP3 (MPEG (Moving Picture Experts Group) -1 Audio Layer 3) standard. Recently, CD players capable of reproducing both uncompressed audio data and compressed audio data compressed in conformity with the MP3 standard have become common.

  In a CD player capable of reproducing both uncompressed audio data and compressed audio data, TOC (Table Of Contents) information recorded on the CD is read, and the audio data recorded on the CD is uncompressed audio data. It recognizes whether it is CD-DA data or MP3 data (CD-ROM data) that is compressed audio data (see, for example, Patent Document 1).

JP 2002-190160 A

  On the other hand, in order to prevent illegal copying of music CDs, music CDs to which copy control technology called CCCD (Copy Control CD) is applied are becoming widespread. As a copy control technology, for example, there is a media clock (Media CloQ) developed by Suncom. In the media clock, false information (information that is not true) is intentionally described in a control bit or the like indicating the type (format) of audio data in the TOC information. When such a CCCD is played back by a CD player that recognizes the format of audio data based on the TOC information, normal music playback may not be performed.

  That is, for example, the CD-DA uncompressed audio data is recorded in the media clock type CCDC, but the audio data format is MP3 as lie information in the control bit of the TOC information. Information to be described is described. For this reason, the CD player misrecognizes that the audio data recorded on the CD is MP3 data due to the lie information and tries to perform the reproduction process, and therefore normal music reproduction may not be performed. there were.

  The present invention has been made in view of such a situation so that even when information indicating the type of data recorded on a recording medium is incorrect, the data can be normally reproduced. To do.

  The reproducing apparatus of the present invention includes a reading unit that reads data and management information recorded on a recording medium, a reproducing unit that performs reproduction processing of the data read by the reading unit, and the management information read by the reading unit Based on the identification information, the identification information determination means for determining whether the data is data in the first format, and the identification information determination means determines that the data is data in the first format, A data area determination unit that determines whether or not data of the first format is recorded in the data area; and a case where the data area determination unit determines that data of the first format is not recorded in the data area, Control means for controlling reproduction processing in the reproduction means so as to reproduce the data as data in the second format. It is characterized in.

  Based on the identification information, the identification information determination unit determines whether the data is data in the second format, and the control unit determines that the data is in the second format by the identification information determination unit. When it is determined, the reproduction process in the reproduction unit can be controlled so that the data is reproduced as data of the second format.

  The control means determines that the data is in the second format by the identification information determination means or that the data area determination means determines that the data in the first format is not recorded in the data area. In this case, the reproduction process in the reproduction unit can be controlled based on the management information.

  When a plurality of data is recorded in the data area, and the management information further includes address information indicating each address of the plurality of data, the control means further includes a reading means based on the address information. By controlling, the data recorded in the data area can be read out.

  The data in the first format is data compressed in accordance with MP3 (MPEG (Moving Picture Experts Group) -1 Audio Layer 3) standard, and the data in the second format is CD-DA (Compact Disc Digital Audio). ) Data.

  The recording medium may be a media clock (Media CloQ) type CCCD (Copy Control Compact Disc).

  The reproducing method of the present invention includes a reading step for reading data and management information recorded on a recording medium, a reproducing step for reproducing the data read by the processing of the reading step, and a reading by the processing of the reading step. Based on the identification information of the management information, the identification information determination step for determining whether the data is data in the first format, and the data in the first format by the processing of the identification information determination step Is determined, the data area determination step for determining whether or not data in the first format is recorded in the data area, and the data in the first format is recorded in the data area by the processing of the data area determination step. If it is determined that it is not, the data is played back as data in the second format. In, characterized in that it comprises a control step of controlling the reproduction processing in the reproduction step.

  In the present invention, the data and management information recorded on the recording medium are read, and the read data is reproduced. On the other hand, if it is determined whether the data is data in the first format based on the identification information of the read management information, and if it is determined that the data is data in the first format, the data area Whether data of the first format is recorded is determined. Then, when it is determined that the data in the first format is not recorded in the data area, the reproduction process is controlled so that the data is reproduced as data in the second format.

  According to the present invention, even when information indicating the type of data recorded on a recording medium is incorrect, the data can be normally reproduced.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode of the present invention will be described below. The correspondence relationship between the disclosed invention and the embodiments is exemplified as follows. Although there are embodiments which are described in this specification but are not described here as corresponding to the invention, the embodiments correspond to the invention. It does not mean that it is not a thing. Conversely, even if an embodiment is described herein as corresponding to an invention, that means that the embodiment does not correspond to an invention other than the invention. Absent.

  Further, this description does not mean all the inventions described in the specification. In other words, this description is for the invention described in the specification and not claimed in this application, i.e., for the invention that will be applied for in the future or that will appear as a result of amendment and added. It does not deny existence.

  According to the present invention, a playback device is provided. This reproducing apparatus is recorded on a recording medium in a reproducing apparatus that reproduces a recording medium having a data area in which data is recorded and a management area in which management information including identification information indicating the type of data is recorded. Reading means for reading data and management information (for example, the pickup unit 3 in FIG. 1), reproducing means for performing reproduction processing of the data read by the reading means (for example, the reproduction processing unit 8 in FIG. 1), and reading means Identification information determination means (for example, the CPU 7 that executes the process of step S14 in FIG. 6) for determining whether the data is data of the first format based on the identification information of the management information read by If the identification information determining means determines that the data is in the first format, the data in the first format is recorded in the data area. The data area determining means (for example, the CPU 7 that executes the process of step S16 in FIG. 6) and the data area determining means determine that data in the first format is not recorded in the data area. In this case, control means (for example, the CPU 7 that executes the process of step S18 in FIG. 6) is provided to control the reproduction process in the reproduction means so that the data is reproduced as data of the second format. .

  The identification information determination unit also determines whether the data is data in the second format based on the identification information (for example, step S12 in FIG. 6), and the control unit determines whether the data is the first data by the identification information determination unit. When it is determined that the data is in the format 2, the playback process in the playback unit can be controlled so that the data is played back as the data in the second format (for example, step S <b> 13 in FIG. 6). .

  The control unit determines that the data is in the second format by the identification information determination unit, or determines that the data in the first format is not recorded in the data area by the data region determination unit. In this case, it is possible to control the reproduction process in the reproduction unit based on the management information.

  A plurality of data is recorded in the data area, the management information further includes address information indicating addresses of the plurality of data, and the control unit further controls the reading unit based on the address information. By doing so, the data recorded in the data area can be read out.

  The data in the first format is data compressed in accordance with the MP3 (MPEG (Moving Picture Experts Group) -1 Audio Layer 3) standard, and the data in the second format is CD-DA (Compact Disc Digital). Audio) data.

  The recording medium may be a media clock (Media CloQ) type CCCD (Copy Control Compact Disc).

  Moreover, according to the present invention, a reproduction method is provided. This reproduction method is a reproduction method for a reproduction apparatus for reproducing a recording medium having a data area in which data is recorded and a management area in which management information including identification information indicating the type of data is recorded. A read step (for example, step S11 in FIG. 6) for reading the read data and management information, and a reproduction step (for example, steps S32, S34, FIG. S35) and an identification information determination step (for example, step S14 in FIG. 6) for determining whether the data is data of the first format based on the identification information of the management information read out by the processing of the reading step. ), And when the identification information determination step determines that the data is data in the first format. The data area determining step (for example, step S16 in FIG. 6) for determining whether or not the data in the first format is recorded in the data area, and the data area determining step in the data area determining step. Including a control step (for example, step S18 in FIG. 6) for controlling the reproduction process in the reproduction step so that the data is reproduced as data of the second format when it is determined that the data is not recorded. Features.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration example of an embodiment of a disc playback apparatus to which the present invention is applied.

  In the disc playback apparatus of FIG. 1, for example, audio data recorded on the optical disc 1 such as a CD conforming to the so-called red book or a CCCD not conforming to the red book, and the format as the type of the audio data, for example TOC (Table Of Contents) information (management information) including a control bit (identification information) indicating the data is read, and audio data is reproduced according to the TOC information.

  The disk reproducing apparatus includes a spindle motor 2, a pickup unit 3, an RF (Radio Frequency) amplifier 4, a servo DSP (Digital Signal Processor) unit 5, a motor driver 6, a CPU (Central Processing Unit) 7, a reproduction processing unit 8, a DAC ( Digital Analog Converter) 9, amplifier 10, and speaker 11.

  The spindle motor 2 is controlled by a motor driver 6 and rotationally drives the optical disc 1 with CLV (Constant Linear Velocity) or CAV (Constant Angular Velocity).

  The pickup unit 3 is controlled by the motor driver 6 and reads data recorded on the optical disc 1. That is, the pickup unit 3 condenses and irradiates the optical disc 1 with laser light. Further, the pickup unit 3 receives the reflected light from the optical disc 1 and performs photoelectric conversion, and supplies a signal obtained as a result to the RF amplifier 4.

  The RF amplifier 4 generates a focus error signal, a tracking error signal, and an RF signal based on the signal supplied from the pickup unit 3, and supplies the tracking error signal and the focus error signal to the servo DSP unit 5. The signal is binarized and supplied to the reproduction processing unit 8.

  The servo DSP unit 5 controls the focus servo operation and the tracking servo operation. Specifically, the servo DSP unit 5 generates a focus servo signal and a tracking servo signal based on the focus error signal and the tracking error signal supplied from the RF amplifier 3 and supplies them to the motor driver 6. Further, the servo DSP unit 5 supplies a position control signal for controlling the position of the pickup unit 3 to the motor driver 6 according to the control from the CPU 7. The servo DSP unit 5 generates a spindle motor drive signal for driving the spindle motor 2 and supplies it to the motor driver 6.

  The motor driver 6 controls the pickup unit 3 based on the focus servo signal, the tracking servo signal, and the position control signal supplied from the servo DSP unit 5, and sets the laser beam irradiation position of the pickup 3 to a predetermined position. . The motor driver 6 controls the spindle motor 2 based on the spindle motor drive signal supplied from the servo DSP unit 5 to drive the spindle motor 2 to rotate.

  The CPU 7 performs various processes by executing a program stored in a memory (not shown). Specifically, for example, the CPU 7 controls the servo DSP unit 5 to cause the pickup unit 3 to read data recorded on the optical disc 1. That is, the CPU 7 drives the spindle motor 2 via the servo DSP unit 5 and the motor driver 6, thereby rotating the optical disc 1. Further, the CPU 7 controls the pickup unit 3 via the servo DSP unit 5 and the motor driver 6 to access a predetermined position of the optical disc 1 and read data recorded at the position. Further, the CPU 7 determines, for example, the format as the type of audio data recorded on the optical disc 1 using the TOC information supplied from the reproduction processing unit 8, and based on the determination result, the reproduction processing unit 8 reproduction processing is controlled.

  The reproduction processing unit 8 obtains TOC information from the RF signal supplied from the RF amplifier 4 and supplies it to the CPU 7. Further, the reproduction processing unit 8 performs reproduction processing on the RF signal supplied from the RF amplifier 4 under the control of the CPU 7. That is, the reproduction processing unit 8 performs, for example, frame synchronization signal detection, sub-coding detection, EFM (Eight to Fourteen Modulation) demodulation, error detection / correction, and the like on the RF signal supplied from the RF amplifier 4. A reproduction process for reproducing CD-DA audio data (hereinafter also referred to as CDDA data as appropriate) is performed and output to the DAC 9. Further, the reproduction processing unit 8 includes a decoding unit 8A that performs decoding based on the MP3 standard, for example, and causes the decoding unit 8A to decode the RF signal supplied from the RF amplifier 4 or the like. Audio data reproduction processing is performed, and audio data obtained as a result of the reproduction processing is output to the DAC 9. The decoding unit 8A decodes the RF signal supplied to the reproduction processing unit 8 as necessary.

  The DAC 9 converts the audio data supplied from the reproduction processing unit 8 from a digital signal to an analog signal and supplies the analog signal to the amplifier 10.

  The amplifier 10 amplifies the analog audio signal supplied from the DAC 9 and supplies the amplified audio signal to the speaker 11 for output.

  In the disc reproducing apparatus of FIG. 1 configured as described above, the data recorded on the optical disc 1 is read in the form of an RF signal in the optical pickup unit 3 and is reproduced via the RF amplifier 4. To be supplied. The reproduction processing unit 8 obtains TOC information from the RF signal supplied thereto and supplies it to the CPU 7.

  Based on the TOC information supplied from the playback processing unit 8, the CPU 7 determines whether the audio data recorded on the optical disc 1 is MP3 data that is compressed data or CD-DA data that is uncompressed data. It is determined whether the data is data, and the reproduction processing of the reproduction processing unit 8 is controlled based on the determination result. The reproduction processing unit 8 performs reproduction processing for reproducing audio data from the RF signal from the RF amplifier 4 under the control of the CPU 7. Audio data obtained as a result of the reproduction processing by the reproduction processing unit 8 is supplied to the speaker 11 via the DAC 9 and the amplifier 10 and output.

  FIG. 2 shows an outline of a configuration example of the optical disc 1 of FIG.

  In FIG. 2, the optical disc 1 is a multi-session CD composed of two sessions. Here, a session refers to one unit that starts with lead-in and ends with lead-out. Of the multi-session CDs, audio data written in the first session and CD-ROM data written in the second and subsequent sessions are the so-called “CD-EXTRA specifications”. The standard is defined in the Blue Book.

  In FIG. 2, the recording area of the optical disc 1 is divided into four recording areas 31 to 34 from the inner peripheral side toward the outer peripheral direction. Further, the optical disc 1 of FIG. 2 has first and second sessions. The first session is composed of a recording area 31 and a recording area 32. In the recording area 31, lead-in including TOC information for the recording area 32 is recorded, and in the recording area 32, CD-DA data that is uncompressed audio data and lead-out are recorded. The second session is composed of a recording area 33 and a recording area 34. In the recording area 33, a lead-in including TOC information for the recording area 34 is recorded. In the recording area 34, compressed audio data is recorded. MP3 data (hereinafter also referred to as ROM data as appropriate) and lead-out are recorded.

  FIG. 3 shows an example of the format of the optical disc 1 of FIG.

  The optical disc 1 has a data area in which data such as CD-DA data and ROM data is recorded, and a management area in which TOC information is recorded.

  As described with reference to FIG. 2, in the optical disc 1, the first session and the second session are sequentially formed from the inner periphery side toward the outer periphery side. The first session is configured by sequentially forming a lead-in (area), a CD-DA track, and a lead-out (area) from the inner circumference side to the outer circumference side of the optical disc 1.

  Here, as described above, one session is formed from lead-in to lead-out, and a predetermined recording area on the optical disc 1 including the lead-in and lead-out is referred to as a management area. Further, a recording area sandwiched between a management area including lead-in and a management area including lead-out is a data area in which original data is recorded.

  In FIG. 3, the first session has a management area consisting only of lead-in and a management area consisting only of lead-out. A CD-DA track, which is CD-DA audio data, is formed in the data area of the first session. 3, the management area where the lead-in of the first session is formed (recorded) corresponds to the recording area 31 of FIG. 2, and the data area of the first session, the management area where the lead-out is formed, Corresponds to the recording area 32 of FIG.

  In the second session, lead-in, PVD (Primary Volume Descriptor), pass table, and lead-out are sequentially formed from the inner circumference side to the outer circumference direction of the optical disc 1.

  In FIG. 3, the second session has a management area consisting of lead-in, PVD, and path table, and a management area consisting only of lead-out. In the data area sandwiched between the two management areas in the second session, ROM tracks that are MP3 audio data are formed. In FIG. 3, the management area in which the lead-in, PVD, and pass table for the second session are formed corresponds to the recording area 33 in FIG. 2, and the data area for the second session and the lead-out are formed. The management area corresponds to the recording area 34 in FIG.

  In the CD-DA track and the ROM track, the pre-gap, which is the time until the first track is played, is 2 seconds each.

  In addition, in the lead-in of each session, TOC information including a control bit indicating the format of audio data recorded in the data area of the session is recorded. The CD-DA track is a single or a plurality of tracks in which the audio data of CD-DA of one song is one track, and the ROM track is composed of ROM data of one or more songs, for example. In the PVD, for example, data indicating that the second session conforms to ISO9660 is described, and in the path table, for example, directory information of the optical disc 1 is described.

  In addition, data handled by a computer or the like in the so-called CD-ROM format can be recorded on the ROM track.

  FIG. 4 shows an example of the format of the TOC information recorded in the lead-in of FIG.

  TOC information consists of 4 bits from the beginning, 4 control bits, 4 address bits, 8 bit movement number TNO, 8 bit POINT, 8 bit Tmin, 8 bit Tsec, 8 bit Tframe, 8 bit 0, 8-bit Pmin, 8-bit Psec, 8-bit Pframe, and 16-bit CRC (Cyclic Redundancy Code) are sequentially arranged. The movement numbers TNO, POINT, Tmin, Tsec, Tframe, 8-bit 0, Pmin, Psec, and Pframe are called data bits. Hereinafter, the value of the data bit is expressed by BCD (Binary Coded Decimal).

  In the 4-bit control bits, identification information indicating the type (format) of audio data recorded in the data area (for example, the CD-DA track or the ROM track in FIG. 3) is recorded. For example, when the audio data is CD-DA data, the control bit is “0000”, and when the audio data is ROM data (MP3 data), the control bit is “0100”.

  For example, “0001”, “0010”, or “0011” is recorded in the address bits.

  00 indicating lead-in is recorded in the movement number TNO, and 00 to 99, A0, A1, etc. are recorded in the POINT as information representing the contents of Pmin, Psec, and Pframe described later. Further, the minutes, seconds, and frame numbers of the elapsed time in the track are recorded in Tmin, Tsec, and Tframe, respectively. Further, in Pmin, Psec, and Pframe, the minute, second, and frame number of the absolute time for the contents of POINT are recorded, respectively.

  That is, the TOC information in FIG. 4 exists for each track of audio data, and any value in the range of 00 to 99 representing the track is recorded in the POINT of the TOC information of each track. Further, the absolute time (start time that is absolute time) (start address) at which the track indicated by the number recorded in POINT starts is recorded in Pmin, Psec, and Pframe of the TOC information for the track of audio data. .

  When POINT is A0, the track number of the audio data of the first song recorded in the data area is recorded in Pmin. When POINT is A1, the track number of the audio data of the last song is recorded in Pmin. Is recorded. When POINT is A0 or A1, 00 is recorded in Psec and Pframe, respectively.

  In the CRC, information necessary for error detection of a cyclic code for data recorded in data bits is recorded.

  FIG. 5 shows an example of information on the optical disc 1 expressed by the TOC information. As shown in FIG. 3, the optical disc 1 has two sessions, a first session and a second session. In FIG. 5, the optical disc 1 is a CCDC in which lie information is recorded in the control bit of the TOC information of the first session.

  As shown in FIG. 3, CD-DA data is recorded in the data area of the first session, but the control bits of all the TOC information of all the tracks in the first session contain ROM as lie information. For example, “0100” indicating that data is recorded is recorded. That is, the control bits of the TOC information for all the tracks in the first session are ROM track information indicating that the corresponding audio data track is a ROM track.

  In FIG. 5, the first track number (START TRACK) of the first session is 1, and the last track number (LAST TRACK) is 15. That is, in the TOC information of the first session, Pmin in the TOC information in which the POINT (FIG. 4) is A0 is 01, and Pmin in the TOC information in which the POINT is A1 is 15. Yes.

  In the first session, as shown in FIG. 3, the pre-gap, which is the time until the first track TRACK1 is reproduced, is 2 seconds, so the absolute time of the TRACK1 start time is 2 seconds (00 ' 02''00). The absolute time of the start time of the second track TRACK2 is 2 minutes 21 seconds 8 frames (02'21''08). That is, in the TOC information of the first session, Psec in the TOC information in which the POINT is 01 is 02, and Pmin, Psec, and Pframe in the TOC information in which the POINT is 02 are 02, 21 and 08. Similarly, the absolute times of the start times of TRACK 3 to 13 are recorded in Pmin, Psec, and Pframe of TOC information for points 03 to 13 of TOC information, respectively.

  The absolute time as the start time of the TRACK 14 in the first session is 33 minutes 31 seconds 30 frames (33′31 ″ 30), and the absolute time as the start time of the TRACK 15 in the second session is 35 It is minutes 55 seconds 55 frames (35'55''55). The absolute time as the start time of the lead-out (LEAD OUT) is 38 minutes 21 seconds 42 frames (38'21''42), and the lead-in address (Next Address) of the next session, that is, The absolute time as the start time of the lead-in address of the second session is 40 minutes 51 seconds 42 frames (41′51 ″ 42).

  Further, the first track number (START TRACK) of the second session is 16, and the last track number (LAST TRACK) is 16. That is, Pmin in the TOC information in which the POINT (FIG. 4) is A0 and A1 in the TOC information of the second session is 16, respectively.

  As shown in FIG. 3, in the second session, the pre-gap, which is the time until the first track TRACK 16 is reproduced, is 2 seconds as in the first session. The absolute time is 40 minutes 53 seconds 42 frames (40′53 ″ 42) obtained by adding 2 seconds to 40 minutes 51 seconds 42 frames, which is the absolute time as the lead-in start time of the second session. The absolute time as the start time of the lead-out (LEAD OUT) is 40 minutes 59 seconds 44 frames (40'59''44).

  As described above, the audio data of a plurality of tracks is recorded in the data area of the first session, and the TOC information of the lead-in recorded in the management area of the first session is the audio recorded in each track. The start address of data is recorded. Based on this start address, the CPU 7 controls the servo DSP unit 5 to read out audio data.

  FIG. 6 is a flowchart for explaining audio data discrimination processing for discriminating the type (format) of audio data recorded in the data area of the optical disc 1 by the disc playback apparatus of FIG. Note that this audio data determination process is started, for example, when the user inserts the optical disc 1 into the disc playback apparatus.

  In step S11, the pickup unit 3 reads the TOC information of the optical disc 1, supplies the TOC information to the CPU 7 via the RF amplifier 4 and the reproduction processing unit 8, and proceeds to step S12. If the optical disc 1 is a multi-session CD, the pickup unit 3 reads the TOC information recorded in the lead-in of the first session (first session).

  Specifically, the CPU 7 controls the servo DSP unit 5 to execute the reproduction of the TOC information. The servo DSP unit 5 controls the spindle motor 2 by controlling the motor driver 6 to rotate and drive the optical disc 1, and also controls the pickup unit 3, so that laser light is applied to the lead-in of the first session of the optical disc 1. Focus and irradiate. The pickup unit 3 photoelectrically converts the reflected light from the optical disc 1 and supplies a signal obtained as a result to the RF amplifier 4. The RF amplifier 4 generates a focus error signal, a tracking error signal, and an RF signal based on the signal from the pickup unit 3, supplies the tracking error signal and the focus error signal to the servo DSP unit 5, and outputs the RF signal. Is binarized and supplied to the CPU 7 via the reproduction processing unit 8. The servo DSP unit 5 controls the motor driver 6 based on the tracking error signal and the focus error signal.

  In step S12, the CPU 7 determines whether the audio data of all tracks recorded in the data area of the first session of the optical disc 1 is CD-DA data based on the control bit of the TOC information of the first session. Determine whether. That is, for example, the CPU 7 determines that the data is CD-DA data when the value of the control bit of each TOC information regarding all tracks of the first session is “0000”.

  If it is determined in step S12 that the audio data of all tracks is CD-DA data, the process proceeds to step S13, and the CPU 7 records the audio data recorded in the data area of the optical disc 1 by the control bit of the TOC information. Is the CD-DA data, the determination result is supplied to the reproduction processing unit 8 and the process is terminated.

  On the other hand, if it is determined in step S12 that the audio data of all tracks is not CD-DA data, the CPU 7 proceeds to step S14, and all the tracks recorded in the data area of the first session of the optical disc 1 are recorded. It is determined whether or not the data is ROM data. That is, for example, when the value of the control bit of each TOC information regarding all tracks of the first session is “0100”, the CPU 7 determines that the data is ROM data.

  For example, when the optical disc 1 in which the TOC information of the first session is as shown in FIG. 5 is inserted into the disc playback device, the value of the control bit of each TOC information for all tracks of the first session is “0100”. Therefore, it is determined that the data of all tracks recorded in the data area of the first session is ROM data.

  If it is determined in step S14 that the data of all tracks is ROM data, the CPU 7 proceeds to step S15 to detect whether ROM data is recorded in the data area of the first session. Proceed to S16. For example, the CPU 7 detects the presence or absence of ROM data by determining whether the extension of the file constituting the data recorded in the data area is “MP3” representing the MP3 data that is ROM data. To do. That is, when the file extension is “MP3”, the CPU 7 detects that there is ROM data (recorded), and when the file extension is not “MP3”, there is no ROM data (recorded). Is not detected).

  In step S16, the CPU 7 determines whether ROM data is recorded in the data area of the first session based on the presence or absence of the ROM data detected in step S15.

  If it is determined in step S16 that ROM data is recorded, that is, if the information indicated by the control bit is accurate information, the CPU 7 proceeds to step S17 and is recorded in the data area of the first session. The audio data is determined to be ROM data, the result is supplied to the reproduction processing unit 8, and the process is terminated.

  On the other hand, if it is determined in step S16 that ROM data is not recorded, that is, if the information indicated by the control bit is false information, the process proceeds to step S18, and the CPU 7 ignores the information indicated by the control bit. Thus, it is determined that the audio data recorded in the data area of the first session is CD-DA data, the determination result is supplied to the reproduction processing unit 8, and the process ends. That is, in this case, the optical disc 1 is a CCD.

  In steps S14 to S18 described above, when the control bit indicates that the audio data recorded in the data area is ROM data, the CPU 7 actually records the ROM data in the data area. If the ROM data is not recorded, the information indicated by the control bit is ignored and the data recorded in the data area is determined to be CD-DA data. Therefore, even if the optical disc 1 is a CCD with the Media CloQ method and lie information recorded in the control bits, the disc playback device ignores the information indicated by the control bits and records it in the data area. The audio data can be normally reproduced by accurately discriminating the type of the audio data being reproduced and reproducing the audio data according to the discrimination result.

  For example, the TOC information of the first session is as shown in FIG. 5, and in the CCD where the CD-DA data is recorded in the data area, the control of each TOC information for all tracks of the first session is performed. The bit value is “0100” indicating that the data in the data area is ROM data. However, since no ROM data is recorded in the data area of the CCDC, the disc playback apparatus determines that the data recorded in the data area is CD-DA data. Therefore, in the disc reproducing apparatus, the audio data can be normally reproduced by ignoring the information indicated by the control bits and reproducing the audio data as CD-DA data in accordance with the determination result.

  If it is determined in step S14 that the audio data of all tracks is not ROM data, the CPU 7 proceeds to step S19, and since the audio data of all tracks is neither CD-DA data nor ROM data, the first data The audio data recorded in the session data area is determined to be mixed mode CD audio data in which CD-DA data and ROM data are mixed, and the determination result is supplied to the playback processing unit 8 for processing. finish.

  FIG. 7 is a flowchart for explaining a playback process in which the disc playback apparatus of FIG. 1 plays back audio data recorded on the optical disc 1. This reproduction process is performed after the audio data discrimination process of FIG. 6 is performed by the user inserting the optical disk 1 and then, for example, when the user operates an operation unit (not shown). It starts when playback is commanded.

  In step S31, the playback processing unit 8 determines that the audio data recorded in the data area is the CD-DA data as a result of determination supplied from the CPU 7 in step S13, step S17, step S18, or step S19 in FIG. If it is determined that the determination result is CD-DA data, the process proceeds to step S32.

  In step S32, the reproduction processing unit 8 performs reproduction processing for reproducing the RF signal supplied from the pickup unit 3 via the RF amplifier 4 as CD-DA data, and ends the processing.

  Specifically, the CPU 7 controls the servo DSP unit 5 based on Pmin, Psec, and Pframe indicating the start address of the TOC information supplied from the reproduction processing unit 8 in step S11 of FIG. However, by controlling the spindle motor 2 and the pickup unit 3, the laser beam is focused and irradiated on a predetermined position of the optical disc 1, so that the pickup unit 3 can output an RF signal corresponding to audio data from the optical disc 1. And supplied to the reproduction processing unit 8 via the RF amplifier 4. The reproduction processing unit 8 performs reproduction processing for reproducing the RF signal supplied via the RF amplifier 4 as CD-DA data, and supplies the RF signal to the speaker 11 via the DAC 9 and the amplifier 10 for output. That is, the CPU 7 controls the reproduction processing unit 8 to reproduce the audio data as CD-DA data by supplying the reproduction processing unit 8 with a determination result indicating that the data is CD-DA data. Note that when the optical disc 1 is a multi-session CD, the CPU 7 controls the reproduction of only the audio data of the first session, which is the first session, for example.

  On the other hand, if it is determined in step S31 that the determination result from the CPU 7 is not the determination result that the audio data recorded in the data area is CD-DA data, the process proceeds to step S33, and the reproduction processing unit 8 When the determination result supplied from the CPU 7 is a determination result indicating that the audio data recorded in the data area is ROM data, it is determined that the determination result is ROM data. Proceed to step S34.

  In step S34, the reproduction processing unit 8 performs a reproduction process of reproducing the RF signal supplied from the pickup unit 3 via the RF amplifier 4 as ROM data, and ends the process.

  Specifically, if the determination result is a determination result that the audio data recorded in the data area is ROM data, the reproduction processing unit 8 sends the RF signal supplied from the RF amplifier 4 to the decoding unit 8A. MP3 audio data playback processing, such as decoding, is performed and supplied to the speaker 11 via the DAC 9 and the amplifier 10 for output. That is, the CPU 7 controls the reproduction processing unit 8 to reproduce the audio data as ROM data by supplying a determination result indicating that the data is ROM data to the reproduction processing unit 8. Note that when the optical disc 1 is a multi-session CD, the CPU 7 controls the reproduction of only the audio data of the first session, which is the first session, for example.

  If it is determined in step S33 that the determination result from the CPU 7 is not the determination result that the audio data recorded in the data area is ROM data, the audio data recorded on the optical disc 1 is a mixed mode CD. Since it is audio data, the process proceeds to step S35, where the reproduction processing unit 8 reproduces the RF signal supplied from the RF amplifier 4 based on the control bit of the TOC information, and ends the process.

  Specifically, the CPU 7 controls the reproduction processing unit 8 based on the control bit of the TOC information supplied from the pickup unit 3 via the reproduction processing unit 8 in step S11. That is, the CPU 7 sets the control bit of the TOC information for the track in which the audio data to be reproduced is recorded to “0000” indicating that the audio data recorded in the data area is CD-DA data. The playback processing unit 8 plays the audio data as CD-DA data, and the control data of the TOC information for the track on which the audio data to be played back is recorded has the audio data recorded in the data area. When “0100” indicates that the data is ROM data, the reproduction processing unit 8 reproduces the audio data as ROM data.

  In the above description, when the optical disc 1 is a multi-session CD, the CPU 7 reproduces only the audio data of the first session that is the first session, but the audio data of the second session and thereafter can be reproduced in the same manner. it can.

  As described above, in the disc playback apparatus shown in FIG. 1, the TOC information recorded on the optical disc 1 is read, and the audio data recorded in the data area is based on the control bit of the read TOC information. If it is determined whether it is ROM data and audio data is determined to be ROM data, it is determined whether ROM data is actually recorded in the data area, and ROM data is not recorded. If it is determined, since the audio data is reproduced as CD-DA data, the control bit of the TOC information is actually used even though the audio data recorded on the optical disc 1 is CD-DA data. In addition, when playing a CCDC such as Media CloQ in which false information indicating that the audio data recorded on the optical disc 1 is ROM data is recorded. The disk reproducing apparatus, the audio data recorded in the data area, and recognized as a CD-DA data, it is possible to reproduce the audio data normally.

  Further, in the disc playback device, it is determined that the audio data recorded in the data area is ROM data based on the control bit of the TOC information, and it is determined that the ROM data is actually recorded in the data area. If the TOC information is normal and the audio data recorded in the data area is recognized as ROM data and the audio data is played back, the TOC information is normal and the ROM data is recorded in the data area. The optical disc 1 that is currently being played can be played normally.

  Furthermore, in the disc playback device, when it is determined that the audio data recorded in the data area is CD-DA data based on the control bit of the TOC information, the TOC information is normal and is recorded in the data area. Since the audio data is recognized as CD-DA data and the audio data is reproduced, the optical disk 1 in which the TOC information is normal and the CD-DA data is recorded in the data area is normally reproduced. Can do.

  Further, just by the user inserting the optical disc 1 into the disc playback device, the disc playback device performs an audio data discrimination process to discriminate the type of audio data recorded in the data area, and according to the discrimination result. Since the audio data is reproduced, the user does not need to be aware of whether the optical disc 1 is a CCCD or a music CD compliant with the Red Book standard. Furthermore, it is not necessary to provide a special operation button for switching the playback mode exclusively for the disc playback apparatus depending on whether or not the optical disc 1 is a CCD.

  In the above description, the optical disc 1 is a multi-session CD, but it may be a single session CD composed of one session.

  In this embodiment, the CPU 7 detects the presence or absence of ROM data by determining whether or not the file extension is MP3. In addition, the CPU 7 decodes audio data actually read from the optical disc 1. The presence or absence of ROM data can also be detected by decoding to 8A and determining whether or not decoding is possible normally.

  Furthermore, the ROM data is not data compressed by the MP3 method, and may be data compressed by the ATRAC (Adaptive Transform Acoustic Coding) method, for example. In this case, the decoding unit 8A decodes ATRAC compressed data, but the reproduction processing unit 8 needs to incorporate an ATRAC decoder.

  The recording medium may be an optical disk or a randomly accessible medium such as a magnetic disk or a semiconductor memory. Further, a medium on which video data or the like is recorded can be applied as the recording medium.

  Here, in the present specification, the processing steps for describing a program for causing the computer to perform various processes do not necessarily have to be processed in time series in the order described in the flowcharts, but in parallel or individually. This includes processing to be executed (for example, parallel processing or processing by an object).

It is a block diagram which shows the structural example of one Embodiment of the disc reproducing apparatus to which this invention is applied. It is a figure which shows the outline | summary of the structural example of the optical disk of FIG. It is a figure which shows the example of a format of the optical disk of FIG. It is a figure which shows the example of a format of the TOC information recorded on the lead-in of FIG. It is a figure which shows the example of the information expressed with TOC information. 4 is a flowchart for explaining audio data discrimination processing in which the disc playback apparatus of FIG. 1 discriminates the type (format) of audio data recorded in the data area of the optical disc. 2 is a flowchart for explaining a playback process in which the disc playback apparatus of FIG. 1 plays back audio data recorded on an optical disc.

Explanation of symbols

  1 optical disc, 2 spindle motor, 3 pickup unit, 4 RF amplifier, 5 servo DSP unit, 6 motor driver, 7 CPU, 8 playback processing unit, 8A decoding unit, 9 DAC, 10 amplifier, 11 speaker

Claims (7)

In a reproducing apparatus for reproducing a recording medium having a data area in which data is recorded and a management area in which management information including identification information indicating the type of the data is recorded,
Read means for reading the data and the management information recorded on the recording medium;
Reproducing means for performing reproduction processing of the data read by the reading means;
Identification information determination means for determining whether the data is data in a first format based on the identification information of the management information read by the reading means;
Data area determining means for determining whether or not the data in the first format is recorded in the data area when the data is determined to be in the first format by the identification information determining means; ,
When the data area determination means determines that the data in the first format is not recorded in the data area, the reproduction process in the reproduction means is performed so that the data is reproduced as data in the second format. And a control means for controlling. The identification information determining means also determines whether the data is data of the second format based on the identification information;
The control means reproduces the reproduction means so as to reproduce the data as the data of the second format when the data is determined to be the data of the second format by the identification information determination means. The playback apparatus according to claim 1, wherein the processing is controlled. The control means records the data in the first format in the data area when the data is judged to be the data in the second format by the identification information judgment means or the data area judgment means. The reproduction apparatus according to claim 2, wherein if it is determined that the reproduction unit is not, reproduction processing in the reproduction unit is controlled based on the management information. A plurality of the data is recorded in the data area,
The management information further includes address information indicating each address of the plurality of data,
The playback apparatus according to claim 1, wherein the control unit further reads the data recorded in the data area by controlling the reading unit based on the address information. The data of the first format is data compressed in accordance with MP3 (MPEG (Moving Picture Experts Group) -1 Audio Layer 3) standard,
The playback apparatus according to claim 1, wherein the data in the second format is CD-DA (Compact Disc Digital Audio) data. The playback apparatus according to claim 1, wherein the recording medium is a media clock (Media CloQ) type CCCD (Copy Control Compact Disc). In a reproducing method of a reproducing apparatus for reproducing a recording medium having a data area in which data is recorded and a management area in which management information including identification information indicating the type of the data is recorded,
A step of reading out the data and the management information recorded in the recording medium;
A reproduction step of performing reproduction processing of the data read by the processing of the reading step;
An identification information determination step of determining whether or not the data is data of a first format based on the identification information of the management information read by the processing of the reading step;
A data area determination that determines whether or not data in the first format is recorded in the data area when the data is determined to be data in the first format by the processing of the identification information determination step Steps,
The reproduction in the reproduction step so that the data is reproduced as the data in the second format when it is determined by the processing in the data area judgment step that the data in the first format is not recorded in the data area. And a control step for controlling the processing.

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