JP3945533B2 - Playback device - Google Patents

Description

  The present invention relates to a reproducing apparatus for reproducing information recorded on a recording medium having a plurality of recording areas.

A compact disc (CD: compact disc) is first supplied as a music CD (CD-DA: compact disc-digital audio), and the standard has been extended for multimedia. And as a typical CD standard,
CD-DA format CD-ROM (compact disc-read only memory) format CD-I (compact disc-interactive) format The CD-ROM / XA (CD-ROM extended architecture) format is defined.

  The CD-DA format is an audio format. This CD-DA format is a format that is the basis of other CD formats, and defines the physical structure and signal processing system of the disc.

  The CD-ROM format is an extended format for computer data. In this CD-ROM format, an error detection code (hereinafter referred to as EDC: error detection code) and an error correction code (hereinafter referred to as EDC) are used as physical block structures. , ECC: referred to as error correction code), and two modes are defined: mode 1 with EDC / ECC omitted.

  The CD-I format is an extended format that includes image data and character data in addition to audio data. The block structure in the CD-I format is the mode 2 block structure in the CD-ROM format. In this CD-I format, two modes of a form 1 with EDC / ECC added and a form 2 with EDC / ECC omitted are defined as physical block structures.

  The CD-ROM / XA format defines that data and audio data are interleaved in order to synchronize computer data and audio data. The block structure in the CD-ROM / XA format is a mode 2 block structure in the CD-ROM format. In the CD-ROM / XA format, a form with EDC / ECC added as a physical block structure. Two modes are defined: 1 and form 2 with EDC / ECC omitted.

  Recently, a CD-R (compact disc-) has been provided in which a recording surface coated with an organic recording material is provided on one surface of a disk having the same size as a compact disk, and arbitrary data can be written on the recording surface by a light beam. recordable discs have been proposed. In this CD-R disc, a CD-MO (compact disc-magneto optical) format for rewritable CDs and a CD-WO (compact disc-write once) format for write-once CDs are proposed. Is stipulated. Then, CDs of the various formats described above have been created using CD-R discs.

  Here, in the CD format, one track has a single file structure written at one time or a segment of audio data.

  Initially, CD-DA discs, CD-ROM discs and the like are reproduction-only discs, and are composed of one or more tracks including audio tracks on which audio data is recorded and / or data tracks on which computer data is recorded. However, a CD-R disc that can be additionally written can be provided with a plurality of sessions on the disc, and this CD- Multi-session discs using R discs have been provided.

  Patent documents 1 and 2 are known as prior art.

Japanese Patent Laid-Open No. 5-250811 Japanese Patent Laid-Open No. 1-282879

  By the way, the audio data that can be recorded on the CD-R disc in the CD-DA format is 16-bit data. Therefore, for example, audio data of a master tape recorded with a bit number of 16 bits or more cannot be recorded as it is.

  Therefore, by using so-called noise shaving or dither in super bit mapping or the like in consideration of hearing, audio data of 16 bits or more is collected into 16 bits without impairing the sound quality and CD-DA. It is recorded on a CD-R disc in a format.

  With these technologies, CD-R discs recorded in the CD-DA format can be played on a normal CD player. However, since the amount of data is essentially reduced, the same sound as that of the master tape is used. Could not be reproduced.

  If the CD-ROM format is used, it is possible to record the above-described audio data having a bit number of 16 bits or more on a CD-R disc, but it is not compatible with a CD in the CD-DA format. This CD-R disc cannot be reproduced by a CD player.

  Furthermore, there are restrictions on the format of the conventional CD-R disc, and for example, the so-called multi-session format has the same area called an audio session recorded in the CD-DA format and a data session recorded in the CD-ROM format. When a CD-R disc created in the same disc is played back on a normal CD player, a code that may not be recognized is recorded, so the audio data of the audio track recorded in the audio session is played back. May become impossible, or data on the data track recorded in the data session may be erroneously reproduced as audio data.

  Therefore, the present invention has been made in view of the above-described circumstances, and is capable of reproducing a recording medium with high sound quality that is compatible with a conventional CD player and enables high-quality reproduction by a higher-level reproduction device. An object of the present invention is to provide a playback apparatus that performs the above-described operation.

In order to solve the above-described problem, the playback apparatus of the present invention manages a first recording area in which 2-channel digital audio information is recorded , and the digital audio information recorded in the first recording area. A first management area in which information is recorded, a second recording area in which 2-channel digital audio information corresponding to the digital audio information recorded in the first recording area is recorded, and the second recording area A playback apparatus for playing back digital audio information from a recording medium having a second management area in which information for managing the digital audio information recorded in the recording area is recorded, wherein the digital audio information is read from the recording medium. Reproducing means for reproducing; first storage means for storing digital audio information read from the first recording area by the reproducing means; Second storage means for storing the digital audio information read from the second recording area by the reproduction means, and first information for determining whether or not the amount of data accumulated in the first storage means is greater than or equal to a predetermined amount. 1 discriminating means, second discriminating means for discriminating whether or not the amount of data stored in the second storage means is equal to or larger than a predetermined amount, moving means for moving the reproducing means, and the first Based on the information in the management area, the reproducing means is moved to the second recording area, the digital audio information read from the second recording area is stored in the second storage means, and the second discrimination is performed. When the data amount stored in the second storage means is determined to be greater than or equal to a predetermined amount by the means, the first digital audio information corresponding to the digital audio information stored in the second storage means is recorded. 1 record The playback means is moved to the area, the digital audio information read from the first recording area is stored in the first storage means, and the digital audio information is synchronized from the first and second storage means. Control means for performing output control.

  The digital audio information in the second recording area is compressed digital audio information.

Further, the playback device of the present invention includes a first recording area in which digital audio information of higher bits of digital audio information sampled at a predetermined sampling frequency and quantized with a predetermined number of bits is recorded, A first management area in which information for managing digital audio information recorded in one recording area is recorded; and a second management area in which low-order digital audio information of the quantized digital audio information is recorded. A playback device for playing back digital audio information from a recording medium having a recording area and a second management area in which information for managing the digital audio information recorded in the second recording area is recorded. Reproduction means for reproducing digital audio information from the recording medium, and digital audio read from the first recording area by the reproduction means A first storage means for storing information; a second storage means for storing digital audio information read from the second recording area by the reproduction means; and an amount of data stored in the first storage means First determining means for determining whether or not the amount of data stored in the second storage means is greater than or equal to a predetermined amount, second determining means for determining whether or not the amount of data stored in the second storage means is greater than or equal to a predetermined amount, and the reproducing means And moving the reproducing means to the second recording area based on the information in the first management area, and moving the digital audio information read from the second recording area to the second recording area. When the second determination unit determines that the amount of data stored in the storage unit and the second storage unit is greater than or equal to a predetermined amount, the digital audio information stored in the second storage unit Corresponding digital audio The reproduction means is moved to the first recording area where the information is recorded, and the digital audio information read from the first recording area is stored in the first storage means, and the first and second Control means for performing control to output the digital audio information in synchronization with the storage means .

In addition, the playback device of the present invention divides a digital audio information sampled at a predetermined sampling frequency and quantized with a predetermined number of bits into bands at a predetermined frequency, and grouped into high frequency side and low frequency side. A first recording area in which digital audio information obtained by sampling the digital audio information of one group at a sampling frequency lower than the predetermined sampling frequency is recorded , and the digital audio recorded in the first recording area A first management area in which information for managing information is recorded, and a second audio area in which digital audio information in which the digital audio information of the other group divided into the high band side and the low band side is grouped is recorded. And a second management area in which information for managing the digital audio information recorded in the second recording area is recorded. A reproduction device for reproducing digital audio information from the reproduction medium for reproducing the digital audio information from the recording medium, and a first storage for storing the digital audio information read from the first recording area by the reproduction unit. Means, second storage means for storing the digital audio information read from the second recording area by the reproduction means, and whether or not the amount of data stored in the first storage means is greater than or equal to a predetermined amount. A first discriminating unit for discriminating; a second discriminating unit for discriminating whether or not the amount of data stored in the second storage unit is greater than or equal to a predetermined amount; a moving unit for moving the reproducing unit; Based on the information in the first management area, the reproduction means is moved to the second recording area, and the digital audio information read from the second recording area is stored in the second storage means. And when the second determination means determines that the amount of data stored in the second storage means is greater than or equal to a predetermined amount, the digital corresponding to the digital audio information stored in the second storage means The reproduction means is moved to the first recording area where the audio information is recorded, the digital audio information read from the first recording area is stored in the first storage means, and the first and second Control means for performing control to output the digital audio information in synchronization with the storage means .

  The digital audio information recorded in the second recording area has a time code corresponding to the digital audio information recorded in the first recording area.

In addition, the playback apparatus of the present invention manages a first recording area in which 2-channel digital audio information and address information are multiplexed and recorded, and digital audio information recorded in the first recording area. The first management area in which the information is recorded and the second recording in which the 2-channel digital audio information corresponding to the digital audio information recorded in the first recording area and the address information are multiplexed and recorded. A playback apparatus for playing back digital audio information from a recording medium having an area and a second management area in which information for managing the digital audio information recorded in the second recording area is recorded, A first reproducing means for reading digital audio information and address information from the first recording area; and a digital audio from the second recording area. From the second reproducing means for reading the information and address information, the storage means for storing the digital audio information from the second reproducing means, the address information from the first recording area, and the second recording area Control means for controlling the storage means and the second reproduction means based on the address information, digital audio information reproduced by the first reproduction means, and reproduction by the second reproduction means Mixing means for mixing digital audio information in synchronization, and output means for outputting digital audio information mixed by the mixing means.

  The digital audio information in the second recording area is compressed digital audio information.

Also, the playback apparatus of the present invention is the first in which the digital audio information of higher bits of the digital audio information sampled at a predetermined sampling frequency and quantized with a predetermined number of bits and address information are multiplexed and recorded. Recording area, a first management area in which information for managing digital audio information recorded in the first recording area is recorded, and digital audio information of lower bits of the quantized digital audio information And a second recording area in which address information is multiplexed and recorded, and a second management area in which information for managing digital audio information recorded in the second recording area is recorded A playback apparatus for playing back digital audio information from a medium, and reads the digital audio information and address information from the first recording area. 1 reproduction means, second reproduction means for reading digital audio information and address information from the second recording area, storage means for storing the digital audio information from the second reproduction means, and the first Based on the address information from the recording area and the address information from the second recording area, control means for controlling the storage means and the second reproduction means, and reproduction by the first reproduction means Mixing means for synchronizing and mixing the digital audio information and the digital audio information reproduced by the second reproducing means, and an output means for outputting the digital audio information mixed by the mixing means .

In addition, the playback device of the present invention divides a digital audio information sampled at a predetermined sampling frequency and quantized with a predetermined number of bits into bands at a predetermined frequency, and grouped into high frequency side and low frequency side. A first recording area in which digital audio information obtained by sampling the digital audio information of one group at a sampling frequency lower than the predetermined sampling frequency and address information are multiplexed and recorded, and the first recording Digital audio obtained by compressing the first management area in which information for managing digital audio information recorded in the area is recorded, and the other group of digital audio information divided into the high frequency side and the low frequency side information and address information is managed and the second recording area which is recorded in a multiplexed, digital audio information recorded in the recording area of the second A playback device for playing back digital audio information from a recording medium having a second management area in which the information is recorded, and a first playback means for reading the digital audio information and address information from the first recording area; , Second reproducing means for reading digital audio information and address information from the second recording area, storage means for storing digital audio information from the second reproducing means, and address from the first recording area Control means for controlling the storage means and the second reproduction means based on the information and the address information from the second recording area; the digital audio information reproduced by the first reproduction means; and Mixing means for mixing digital audio information reproduced by the second reproducing means in synchronization with the mixing means And output means for outputting the digital audio information.

  According to the reproducing apparatus of the present invention, the reproducing means reproduces the digital audio information from the recording medium, the first storage means stores the digital audio information from the first recording area of the recording medium, and the second storage means Stores digital audio information from the second recording area of the recording medium. The first determination means determines whether or not the amount of data stored in the first storage means has reached a predetermined amount, for example, an allowable storage amount, and the second determination means is stored in the second storage means. It is determined whether the data amount reaches a predetermined amount, for example, an allowable accumulation amount. The moving means moves the reproducing means. The control means moves the moving means to access the second recording area based on the information in the first management area in which information for managing the first recording area is recorded, and this accessed data Control is performed to store the digital audio information read from the recording position in the second storage unit, and based on the result from the second determination unit, the amount of data stored in the second storage unit is determined to be a predetermined amount or more. Then, the moving means is moved to access the first recording area, and control is performed to store the digital audio information read from the accessed data recording position in the first storage means. The digital audio information is synchronously output from the storage means.

  Also, 2-channel digital audio information is recorded in the first recording area, and 2-channel digital audio information corresponding to the digital audio information recorded in the first recording area is recorded in the second recording area. When the recorded recording medium is used, the first storage means accumulates the digital audio information recorded in the first recording area, and the second storage means is recorded in the second recording area. The stored digital audio information is accumulated. The control means controls the first and second storage means and outputs the digital audio information stored in the respective storage means in synchronization. Thus, multi-channel high-quality digital audio information is output.

  For example, when a recording medium in which up to 16 bits of digital audio information of 16 bits or more are recorded in the first recording area and digital audio information for the remaining bits is recorded in the second recording area is used. The first storage means accumulates digital audio information recorded in the first recording area, and the second storage means accumulates digital audio information recorded in the second recording area. The control means controls the first and second storage means and outputs the digital audio information accumulated in the respective storage means in synchronization. In this way, high-quality digital audio information with a high bit rate is output.

  Further, for example, in the first recording area, digital audio information sampled at a sampling frequency defined in the normal CD-DA format is divided into bands at a predetermined frequency, for example, a half of the sampling frequency. Thus, digital audio information obtained by down-sampling the low frequency side of the half frequency band of the sampling frequency is recorded, and information in which the high frequency side is compressed is recorded in the second recording region. When the medium is used, the first storage unit stores the digital audio information recorded in the first recording area, and the second storage unit stores the compressed digital information recorded in the second recording area. Accumulate audio information. The control means performs control to restore the compressed digital audio information, and performs control to output the digital audio information stored in the first storage means and the restored digital audio information in synchronization. Thus, high-sampling high-quality digital audio information is output.

  According to the reproducing apparatus of the present invention, the first reproducing means reads the digital audio information and the address information from the first recording area of the recording medium, and the second reproducing means is the second reproducing means of the recording medium. Read digital audio information and address information from the recording area. The storage means stores the digital audio information from the second reproduction means. The control means performs control such that the second reproducing means is put into a standby state when the information storage amount of the storage means reaches an allowable amount, based on both address information stored in each storage means. The mixing means mixes the digital audio information read by the first reproducing means and the digital audio information from the storage means, and the output means outputs the digital audio information mixed by the mixing means.

  Also, 2-channel digital audio information is recorded in the first recording area, and 2-channel digital audio information corresponding to the digital audio information recorded in the first recording area is recorded in the second recording area. When the recording medium is used, the first reproducing means reads the digital audio information and address information recorded in the first recording area, and the second reproducing means records in the second recording area. Read digital audio information and address information. The mixing means synchronizes and mixes both digital audio information recorded in each recording area based on the address information recorded in each recording area read by the first and second reproducing means. The output means outputs multi-channel high-quality digital audio information.

  For example, when a recording medium in which up to 16 bits of digital audio information of 16 bits or more are recorded in the first recording area and digital audio information for the remaining bits is recorded in the second recording area is used. The first reproduction means reads the digital audio information and address information recorded in the first recording area, and the second reproduction means reads the digital audio information and address information recorded in the second recording area. Read. The mixing means synchronizes and mixes both digital audio information recorded in each recording area based on the address information recorded in each recording area read by the first and second reproducing means. The output means outputs high-quality digital audio information that has been converted to high bits.

  Further, for example, in the first recording area, digital audio information sampled at a sampling frequency defined in the normal CD-DA format is divided into bands at a predetermined frequency, for example, a half of the sampling frequency. Thus, digital audio information obtained by down-sampling the low frequency side of the half frequency band of the sampling frequency is recorded, and information in which the high frequency side is compressed is recorded in the second recording region. When the medium is used, the first reproducing means reads the digital audio information and the address information recorded in the first recording area, and the second reproducing means is compressed and recorded in the second recording area. Read digital audio information and address information. The mixing means is recorded in each recording area based on the address information read by the first reproducing means and the address information obtained by decoding the information compressed by the decoding unit, for example. Both digital audio information is synchronized and mixed. The output means outputs high-sampling high-quality digital audio information.

  According to the present invention, a recording medium in which digital audio information is recorded in the first recording area and digital audio information corresponding to the digital audio information recorded in the first recording area is recorded in the second recording area. The digital audio information recorded in the first and second recording areas is read and reproduced using a single reproduction means, and the corresponding digital audio information is output in synchronization with each other. Therefore, it is possible to reproduce digital audio information from a recording medium recorded with high sound quality without deteriorating sound quality.

  According to the present invention, digital audio information is recorded in the first recording area, and digital audio information corresponding to the digital audio information recorded in the first recording area is recorded in the second recording area. For reproduction of the recording medium, the digital audio information recorded in the first and second recording areas is extracted using two reproducing means, and the corresponding digital audio information corresponding to each other is output in synchronization by the mixing means. By doing so, it is possible to reproduce digital audio information from a recording medium recorded with high sound quality without deteriorating sound quality.

  Embodiments of a recording medium, a recording apparatus, a reproducing method, and a reproducing apparatus according to the present invention will be described below with reference to the drawings. As a recording medium, a CD-R disc that is a disc-shaped recording medium is used. As a recording device, an example of a recording device for a disc-shaped recording medium that records digital audio information on the CD-R disc is given. An example of a playback method and a playback device for a disk-shaped recording medium that plays back digital audio information recorded on a CD-R disc will be described as a playback device.

  For example, as shown in FIG. 1, the CD-R disc 1 has a first recording area 3 in which a digital audio signal (information) sampled at a predetermined sampling frequency and quantized with a predetermined number of bits is recorded. A first management area 2 in which information for managing the digital audio signal recorded in the first recording area 3 is recorded, and a digital corresponding to the digital audio signal recorded in the first recording area 3 It has the 2nd recording area 6 in which the audio signal was recorded, and the 2nd management area 5 in which the information for managing the digital audio signal recorded on the 2nd recording area 6 was recorded.

  Further, the center hole 8 is provided in the center of the CD-R disc 1, and the first management area 2, the first recording area 3, and the first lead-out area 4 corresponding to these areas. The first session 9 is formed, and the second session 10 is formed by the second management area 5, the second recording area 6, and the second lead-out area 7 corresponding to these areas. Is a so-called multisession disc on which is formed. Here, CD-DA format data may be written (recorded) in the first session 9, and CD-ROM format data may be written in the second session 10.

  Here, prior to describing management of address information on the recording medium of the present invention, sub-coding frames will be described.

  CIRC (cross interleaved reed solomon code) is adopted as an error correction code of a CD system such as CD-DA or CD-ROM. In this CD system, the signal recorded on the disc-shaped recording medium is a signal sampled at a sampling frequency of 44.1 kHz. Further, the sampled data is collected into one CIRC frame for every data of six sampling sections.

  For example, as shown in FIG. 2, the format of the signal combined into one CIRC frame is a 24-bit synchronization pattern data area 81, a 14-bit sub-coding area 82, and each of 16 pieces of CIRC frames 85. A program data area 83 composed of 14-bit program data D0 to D15, a parity data area 84 composed of four 14-bit parity data P0 to P3, and another program data area 83 and a parity data area 84 are provided. It is a thing. In order to combine the data of the areas, a 3-bit margin area is provided for each portion. Therefore, each CIRC frame 85 has a total of 588 bits of data.

  Further, FIG. 3 shows 98 CIRC frames 85 collected and the data of each area of each CIRC frame 85 combined and rearranged.

  As shown in FIG. 3, each block 89 formed by collecting 98 CIRC frames 85 includes a frame synchronization pattern portion 86, a sub-coding portion 87, and a data and parity portion 88.

  Further, the sub-coding unit 87 has a synchronization pattern of 98 CIRC frames and a data portion defined by 8 symbols of P, Q, R, S, T, U, V, and W. . In particular, the data portion defined by the symbols P and Q is used for controlling the access operation of the playback device.

  Here, each area shown in FIG. 1 is given an address for indicating an absolute position on the CD-R disc 1. This address is managed by a data portion defined by a Q symbol.

  FIG. 4 shows the format of the data part defined by the first session 9, ie Q symbols in the CD-DA format.

  The data structure defined in this format has a data structure in which an information frame 120 including a track number part 101, an index part 102, an elapsed time part 110, a 0 part 106, and an absolute time part 111 is repeated. . The elapsed time section 110 is composed of a minute component section 103, a second component section 104, and a frame number component section 105, and the absolute time section 111 is similarly composed of a minute component section 107, a second component section 108, and a frame number component section. 109. Both frame number component parts 105 and 109 are numbers that further divide 1 second.

  The data of each part is composed of 8-bit data, and is represented by, for example, two digits expressed in binary coded decimal (BCD).

  In FIG. 4, when the data TNO of the track number portion 101 is “01” to “99”, this data TNO represents a movement number so-called track number indicating the order of data recorded in the first recording area 3. The elapsed time portion 110 and the absolute time portion 111 indicate the positions where data corresponding to the track numbers in the first recording area 3 is recorded in the data and parity portion 88. That is, this data becomes the address of the data and parity unit 88.

  The index unit 102 is a subdivided movement. However, when the data IX of the index part 102 is “00”, this data IX indicates that the information frame 120 is an information frame in which data indicating that it is a pause section between movements is recorded. The starting position of the pose before the movement is 0 minute 0 second 0 frame, and is used as a reference position of data shown in the elapsed time portion 110 and the absolute time portion 111. In addition, 0 is inserted into the 0 part 106.

  In the elapsed time section 110, the time from the start of each movement is recorded, and this time is continuously added until the pause section is entered, and starts again from 0 when the track number is updated. On the other hand, the absolute time portion 111 records the time or absolute time that is added from the reference position.

  When the data TNO of the track number portion 101 is “AA”, this data TNO indicates that the information frame 120 is an information frame of the first lead-out area 4.

  Here, in particular, when the data TNO is “00”, this data TNO indicates that the information frame 120 is data in the first management area 2, and the format in this case is the data shown in FIG. The structure is repeated.

  In FIG. 5, when the data PO of the point portion 112 is, for example, “00” to “99”, this data P0 is an information frame in which the information frame 120 indicates the absolute time when each movement indicated by this data PO starts. Each piece of data recorded in the absolute time section 111 indicates the absolute time at which each movement starts. Note that the starting position of the first pause is 0:00:00.

  When the data PO is “A0”, this data PO indicates that the information frame 120 is an information frame indicating the first movement number, and is recorded in the fractional component 107 of the absolute time portion 111. PMIN indicates the first movement number, and “00” is recorded as data PSEC and PFR in the minute component portion 107 and the second component portion 108.

  When the data PO is “A1”, this data P0 indicates that the information frame 120 is an information frame indicating the last movement number, and the last movement number as the data PMIN is stored in the component component 107. In the recorded second component 108 and frame number component 1092, “00” is recorded as data PSEC and PFR.

  When the data PO is “A2”, this data P0 indicates that the information frame 120 is an information frame indicating an absolute time at which the first lead-out area 4 starts. The absolute time when the first lead-out area 4 starts is recorded as data PMIN, PSEC, PFR.

  In any of the above cases, “00” is recorded in each data portion of the elapsed time section 110.

  Further, the presence or absence of the second session 10 is also indicated in the point part 112. For example, when “BO” is written as the data PO in the point portion 112, the second management area 5 is provided in the outer peripheral portion of the pause portion after the first lead-out area 4 in this data PO. The absolute time indicating this position is indicated in, for example, the minute component portion 103, the second component portion 104, and the frame number portion 105 of the elapsed time portion 110. The absolute time indicating the start position of the second management area 5 may be recorded not only in the elapsed time part 110 but also in the absolute time part 111.

  Further, when data corresponding to the data recorded in the first recording area 3 is recorded in the second recording area 6, an information frame in which the point portion 112 is “E0” is provided. If this information frame does not exist, only character data is recorded in the second management area 5 in the second session 10, and data is not recorded in the second recording area 6. It is shown that there is.

  In addition, although the example which provides the information frame which recorded "B0" in the point part 112 was given as identification data which shows the presence or absence of the 2nd session 10, it is not limited to this, The information which recorded "C0" It is good also as identification data with a frame. Although an information frame in which “E0” is recorded is provided as identification data for identifying the CD-R disc 1 and the disc with characters, this is not limited to this, and other types of information frames may be used. Good.

  Similarly, the digital audio information in the second recording area 6 is managed as described above in the normal CD-ROM format by the information frame in the second management area 5.

  Here, a specific example of the CD-R disc will be described together with the first embodiment of the recording apparatus for recording data on the CD-R disc.

  The recording apparatus of the first embodiment is a recording apparatus for recording information on a CD-R disc 1 having a plurality of recording areas, for example, as shown in FIG. The audio processing unit 23 converts the obtained digital audio information (signal) into a format to be recorded on the CD-R disc 1, and samples the digital audio information processed by the audio processing unit 23 into the CD-R. It has a recording unit 18 for recording in the first session 9 and the second session 10 of the disc 1.

  Further, for example, as shown in FIG. 7, the audio processing unit 23 samples the audio signal from the first sound source at a predetermined sampling frequency and quantizes the obtained digital audio information with a predetermined number of bits. The audio signal from the first sound processing unit 16 and the second sound source corresponding to the first sound source is sampled at the same sampling frequency as the predetermined sampling frequency, and the obtained digital audio information is compressed. A second audio processing unit 17. Then, the recording unit 18 records the digital audio information from the first audio processing unit 16 in the first recording area 3 of the first session 9 and the digital audio information from the second audio processing unit 17 in the first recording area 3. 2 is recorded in the second recording area 6 of the second session 10.

  Specifically, the first front microphone 12 and the second front microphone 13 are front channel microphones, and the first rear microphone 14 and the second rear microphone 15 are rear channel microphones. A so-called multi-channel having a plurality of channels is constituted by the front channel and the rear channel.

  Then, the front channel, that is, the two-channel audio signals from the front microphones 12 and 13 are supplied to the first audio processing unit 16, and the first audio processing unit 16 is defined in, for example, the CD-DA format. After sampling the audio signal of the front channel at a sampling frequency of 44.1 kHz, 16-bit linear quantization is performed, and the quantized data is supplied to the recording unit 18. The recording unit 18 records this quantized data in the first recording area 3 of the first session 9.

  The rear channel, that is, the two-channel audio signals from the rear microphone compressors 15 and 15 are supplied to the second sound processing unit 17, and the second sound processing unit 17 similarly converts the rear channel audio signals to For example, after sampling at a sampling frequency of 44.1 kHz, an adaptive transform acoustic coding (ATRAC) algorithm is used, for example, which makes use of auditory characteristics and bit-compresses to a data size of about 1/5. To perform compression. The recording unit 18 records the compressed data in the second recording area 6 of the second session 10.

  At this time, as described above, in the first management area 2, the point portion 112 is defined as, for example, “B0” or “C0”, and the point portion 112 is defined as “E0”. In addition, an information frame in which the point portion 112 is defined as “D1”, for example, is recorded in the second management area 5.

  By the way, in the conventional CD-DA format, the 4-channel digital audio information can be recorded only up to half the recordable time of the normal 2-channel digital audio information, but the present invention is applied. In the recording apparatus, this point is improved, and multi-channel digital audio information represented by 4-channel digital audio information can be recorded for a long time, and a digital CD recorded in a CD-DA format by a normal CD player. A recording medium capable of reproducing audio information can be realized.

  In the above description, D-DA format digital audio information that can be played back by a normal CD player is recorded in the first session 9 and sampled at the sampling frequency of 44.1 kHz in the second session 10. The point portion 112 of the first management area 2 is “B0” or “C0” as identification data indicating that the CD-R disc is recorded with digital audio information compressed using the ATRAC algorithm. The specific example in which the information frame and the information frame that is “E0” are provided and the information frame that the point portion 112 of the second management area 5 is “D1” has been described. For example, the point portion 112 of the first management area 2 and the point portion 112 of the second management area 5 are not limited to specific examples. Record the other values may be identification data.

  In the above description, the second audio processing unit 17 compresses the audio signal of the rear channel using the ATRAC algorithm. However, the second audio processing unit 17 is not limited to this and may compress the audio signal using another compression algorithm. . Further, down-sampling may be performed so as to reduce the number of bits without compression, and quantization may be performed so that data in the CD-ROM format is obtained.

  Next, a description will be given of a second embodiment of the recording apparatus to which the present invention is applied.

  In the recording apparatus of the second embodiment, for example, as shown in FIG. 8, the audio processing unit 23 samples an audio signal from a sound source at a predetermined sampling frequency and converts the obtained digital audio information into a predetermined A quantization unit 24 that quantizes the number of bits, and a separation unit 25 that separates digital audio information from the quantization unit 24 into upper bits and lower bits. Then, the recording unit 18 records the upper bit digital audio information from the separation unit 25 in the first session 9 of the CD-R disc 1, and the lower bit digital audio information of the CD-R disc 1. Are recorded in the session 10.

  Specifically, audio signals from the first microphone 21 and the second microphone 22 are supplied to the quantization unit 24. The quantization unit 24 samples these audio signals at a sampling frequency of 44.1 kHz defined by, for example, the CD-DA format, and then performs 20-bit linear quantization. Here, since the data size defined in the CD-DA format is 16 bits, the separation unit 25 separates the 20-bit quantized audio signal into upper 16-bit data and lower 4 bits.

  The recording unit 18 records the upper 16-bit data separated by the separation unit 25 in the first recording area 3 of the first session 9 and the lower 4-bit data in the second management of the second session 10. Record in area 5.

  At this time, as described above, in the first management area 2, the point portion 112 is defined as, for example, “B0” or “C0”, and the point portion 112 is defined as “E0”. In addition, an information frame in which the point portion 112 is defined as “D2”, for example, is recorded in the second management area 5.

  By the way, in the conventional CD-DA format, digital audio information quantized with a bit number of 16 bits or more or digital audio information having a data size of 16 bits or more cannot be directly recorded on a disc. A process for reducing the bit size of audio information is performed and recorded on a disc as data in CD-DA format. However, in a recording apparatus to which the present invention is applied, for example, digital audio information having a data size of 20 bits is recorded. The audio data is divided into upper 16 bits and lower 4 bits, and the digital audio information having the data size of 16 bits on the upper bit side is recorded in the first recording area 3 in the CD-DA format, and the remaining 4 bits on the lower bit side are recorded. Bit digital audio information Of by recording in the recording area 6, can be recorded 20-bit digital audio information high bit of the CD-R disc. Further, digital audio information recorded in the CD-DA format can be reproduced from the CD-R disc recorded in this way by using a normal CD player.

  In the above description, identification data indicating a CD-R disc in which high-bit digital audio information is separated into upper bits and lower bits and recorded in the first recording area 3 and the second recording area 6 respectively. As an example, an information frame in which the point portion 112 of the first management area 2 is “B0” or “C0” and an information frame that is “E0” are provided, and the point portion 112 of the second management area 5 is Although the specific example provided with the information frame “D2” has been described, the present invention is not limited to this specific example. For example, the point portion 112 of the first management area 2 and the second management area 5 are provided. Other values may be recorded in the point portion 112 as identification data.

  In the above description, an example in which high-bit digital audio information is separated into upper bits and lower bits is simply separated into upper 16 bits and lower 4 bits. However, the present invention is not limited to this. The data on the side may be data obtained on the basis of the digital audio information with high bits, and the data on the lower bit side may be data obtained on the basis of the remaining data.

  Here, FIG. 9 shows a configuration of a modified example of the recording apparatus for recording the high-bit digital audio information separately into upper bits and lower bits.

  In the recording apparatus of this modification, instead of the output of the quantization unit 24, after sampling at a sampling frequency of 44.1 kHz, for example, a master in which digital audio information quantized with a bit number of 16 bits or more is recorded. Digital audio information obtained by reproducing the tape 30 is used. In addition, management information for managing the recorded digital audio information is written in advance on the master tape 30.

  In this recording apparatus, upper bit data to be recorded on the CD-R disc 1, for example, upper 16 bit data, digital audio information from the master tape 30 is converted into a data size by the noise shaping unit 31 or the dither circuit unit 32. Is obtained as a difference between the digital audio information from the master tape 30 and the output from the noise shaping unit 31 or the dither circuit unit 32 by the difference calculation unit 35. Yes.

  That is, the noise shaping unit 31 reduces the quantization noise by moving the frequency characteristic of noise to a high frequency with low sensitivity by taking over-sampling of digital audio information from the master tape 30 in consideration of auditory characteristics. At the same time, digital audio information having 16 or more bits is converted into 16-bit digital audio information (hereinafter also simply referred to as 16-bit data) using a so-called sign bit mapping algorithm. The noise shaping unit 31 supplies the 16-bit data to the management information generation unit 42 and also supplies the music CD format conversion unit 36 and the difference calculation unit 35 via the 16-bit data path 33.

  On the other hand, the dither circuit unit 32 adds random noise smaller than one quantization step, so-called dither, to the digital audio information from the master tape 30, and converts data having a data size larger than 16 bits into 16-bit data. For example, when converting 20-bit quantization level data, that is, 20-bit data to 16-bit data, a 20-bit 1-quantization level step is a 1-quantization at a 16-bit quantization level. Since it is smaller than the step, the data distributed between the 16-bit quantization steps is statistically distributed to the preceding and subsequent 16-bit quantization levels to reduce quantization noise. The dither circuit unit 32 supplies the 16-bit data to the management information generation unit 42 and also supplies the difference calculation unit 35 and the music CD format conversion unit 36 via the 16-bit data path 33.

  The timing correction memory 34 temporarily stores digital audio information having a bit number of 16 bits or more from the master tape 30, and the corresponding data is stored in the noise shaping unit 31 or the dither circuit unit 32. Is supplied to the difference calculation unit 35 in synchronization with the supply to the difference calculation unit 35.

  The difference calculating unit 35 takes the difference between the 16-bit data from the noise shaping unit 31 or the dither circuit unit 32 and the data having a size of 16 bits or more from the timing correction memory 34 and mixes the obtained difference data with the mixing unit. 39.

  The mixing unit 39 mixes the address data supplied from the address data output unit 37 and the difference data from the difference calculation unit 35 to generate a set of data, that is, mixed data. The address data indicates the address of the 16-bit data corresponding to the difference data on the CD-R disc 1, and is played back in synchronization with the difference data and the 16-bit data by a playback device described later. Used. The mixed data is supplied to the internal memory 41 and temporarily stored.

  On the other hand, the music CD format conversion unit 36 converts 16-bit data into data defined by the CD-DA format, and supplies the obtained music CD format data to the EFM modulation unit 45 via the changeover switch 40.

  The CD-ROM format conversion unit 38 converts the mixed data stored in the internal memory 41 into data defined in the CD-ROM format, and the obtained CD-ROM format data is EFM modulated via the changeover switch 40. To the unit 45.

  The management information generation unit 42 has a register, and forms management information to be recorded in the first management area 2 or the second management area 5. It is generated based on the output from the noise shaping unit 31 or the dither circuit unit 32 and temporarily stored in a register. Further, the management information generation unit 42 supplies the management data stored in the register to the EFM modulation unit 45 via the changeover switch 40. As described later, after the first management data to be recorded in the first management area 2 is output to the EFM modulator 45, the second management data to be recorded in the second management area 5 is generated. The second management data is stored in the register.

  The lead-out generator 43 generates lead-out data to be recorded in the first lead-out area 4 and the second lead-out area 7 and outputs it to the EFM modulator 45 via the changeover switch 40.

  The control unit 44 controls the switching operation of the changeover switch 40. Here, data recording on the CD-R disc 1 is performed in order from the inner periphery side, that is, the first management area 2, the first recording area 3, the first lead-out area 4, the second management area 5, The recording is performed in the order of the second recording area 6 and the second lead-out.

  Therefore, according to the order of recording on the CD-R disc 1, the control unit 44 switches the changeover switch 40 so that the output of the management information generating unit 42 is selected at the start of recording, and the first management data is transferred to the EFM modulation unit. 45, and then the changeover switch 40 is switched so that the output of the music CD format conversion unit 36 is selected, and the music CD format data to be recorded in the first recording area 3 sent in real time is EFM modulated. And further switching the changeover switch 40 so that the output of the lead-out generator 43 is selected, and the first lead-out data to be recorded in the first lead-out area 4 is sent to the EFM modulator 45. Supply. Further, after sending the data to be recorded in the first session 9 to the EFM modulator 45 after the control unit 44 has finished sending the data to be recorded in the second session 10, the changeover switch 40 is also used as described above. Is switched in the order of the management information generation unit 42, the CD-ROM format conversion unit 38, and the lead-out generation unit 43, and the data is supplied to the EFM modulation unit 45. When the output is selected by the changeover switch 40, the CD-ROM format conversion unit 38 takes out the data stored in the internal memory 41, converts it into the CD-ROM format, and outputs it.

  The EFM modulation unit 45 modulates the data supplied from each part via the changeover switch 40 by using an EFM (eight to fourteen modulation) algorithm which is a modulation method adopted in the CD method, and is input. Data is converted into a form to be written on the CD-R disk 1 and output to the laser diode 46.

  The laser diode 46 is a recording light source for recording the data output from the EFM modulation unit 45 on the CD-R disc 1, and emits a recording laser beam in accordance with the data from the EFM modulation unit 45. Recording is performed by irradiating the recording surface provided on the surface of the CD-R disc 1 with a recording laser beam.

  For example, as shown in FIG. 10, a detection unit 48 is further provided. The detection unit 48 detects the data amounts of the music CD format data and the CD-ROM format data. It is possible to determine whether or not there is a shortage in the second recording area 6 to which the CD-ROM format data is written, and to operate the control unit 51 in accordance with the determination result.

  That is, the determination result shows that if recording of the music CD format data in the first recording area is continued, the second recording area 6 for recording the CD-ROM format data corresponding to the music CD format data may be insufficient. This signal is generated when this occurs, and this signal is supplied to the control unit 51. And the control part 51 controls the changeover switch 40 based on this signal. In addition, the determination result is supplied to the warning display unit 49, and a display for notifying the forced termination of the recording in the first recording area is performed.

  For example, as shown in FIG. 11, in order to link 16-bit data and difference data, a time code output unit 52 that outputs a time code and a time code from the time code output unit 52 are linked as in the case of address data. A time code data converting unit 53 for converting the data into the data to be mixed with the difference data from the difference calculating unit 35 is provided, and data including time code information is recorded in the second recording area 6 of the CD-R disc 1. You may make it do.

  That is, in FIG. 11, the music CD format conversion unit 55 converts 16-bit data supplied from the noise shaping unit 31 or the dither circuit unit 32 through the 16-bit data path 33 into music CD format data. The music CD format data is EFM-modulated and then recorded in each area of the first session 9 using a recording light source such as a laser diode.

  On the other hand, the mixing unit 54 mixes the difference data from the difference calculation unit 35, the time code data from the time code data conversion unit 53, and the address data from the address data output unit 37, and converts the obtained mixed data into a CD. -It supplies to ROM format conversion part 56. The CD-ROM format conversion unit 56 converts this mixed data into CD-ROM format data. The CD-ROM format data is EFM-modulated and then recorded in each area of the second session 10 using a recording light source such as a laser diode.

  Further, in the recording apparatus shown in FIG. 11, recording in the first session 9 by the music CD format conversion unit 55 and recording in the second session 10 by the CD-ROM format conversion unit 56 are independent of each other. The recording head is used in parallel. Therefore, the internal memory 41 provided in the recording apparatus shown in FIGS. 9 and 10 is not necessary, and in this recording apparatus, the mixed data output from the mixing unit 54 is directly input to the CD-ROM format conversion unit 56. I am trying to supply.

  9 and 10 also includes a portion for outputting data related to the time code, such as the time code output unit 52 of the recording device shown in FIG. 11, and outputs the time code data to the mixing unit 39. You may make it do. In other words, the recording apparatus shown in FIG. 11 may record a time code or the like in the second recording area 6 by using a single recording head, as in the recording apparatuses shown in FIGS. Good.

  Next, a description will be given of a third embodiment of the recording apparatus to which the present invention is applied.

  In the recording apparatus of the third embodiment, for example, as shown in FIG. 12, the audio processing unit 23 samples the audio signal from the recording sound source 11 at a predetermined sampling frequency, and the obtained digital audio. The quantization unit 24 that quantizes the information with a predetermined number of bits, and the digital audio information from the quantization unit 24 is divided into two groups by dividing the band at a frequency that is 1 / integer of a predetermined sampling frequency. And a band dividing unit 61. The recording unit 18 records the digital audio information of one of the two groups in the first session 9 of the CD-R disc 1 and records the digital audio information of the other group on the CD-R disc 1. The second session 10 is recorded.

  Specifically, audio signals from the first microphone 21 and the second 22 are supplied to the quantization unit 24. The quantization unit 24 samples these audio signals at a sampling frequency higher than the sampling frequency defined in, for example, the CD-DA format, for example, 88.2 kHz, and then performs 20-bit linear quantization. Here, the data size defined in the CD-DA format is 16 bits sampled at a sampling frequency of 44.1 kHz. In addition, the effective signal component in the digital audio information sampled at a predetermined sampling frequency is on the lower frequency side than the half of the sampling frequency.

  Therefore, the band dividing unit 61 is composed of, for example, a low-pass filter that passes a signal component of 22 kHz or less and a band-pass filter that passes a signal component of a band from 22 kHz to 44 kHz. . Of the digital audio information sampled at the sampling frequency of 2 kHz, a signal component of 22 kHz or less is extracted by the low-pass filter, and this signal component is supplied to the frequency characteristic converter 62, and 22 kHz by the band-pass filter. A signal component of ˜44 kHz is extracted, and this signal component is supplied to the compression processing unit 63.

  The frequency characteristic converter 62 further samples the signal component in the band up to 22 kHz at a sampling frequency of 44.1 kHz, and reduces the 20-bit data size to 16 bits using, for example, the above-described sign bit mapping algorithm. To the recording unit 18. In this way, data defined in the CD-DA format, that is, data sampled at a sampling frequency of 44.1 kHz and quantized with 16 bits is obtained.

  On the other hand, the compression processing unit 63 compresses the signal component in the band of 22 kHz to 44 kHz to a data size of about 1/5 using, for example, the above-described ATRAC algorithm, and supplies the compressed data to the recording unit 18.

  The recording unit 18 records the data from the frequency characteristic conversion unit 62 in the first recording area 3 of the first session 9 of the CD-R disc 1, and the compressed data from the compression processing unit 63 in the CD-ROM format. The data is converted into data and recorded in the second recording area 6 of the second session 10 of the CD-R disc 1.

  At this time, as described above, in the first management area 2, the point portion 112 is defined as, for example, “B0” or “C0”, and the point portion 112 is defined as “E0”. In addition, an information frame in which the point portion 112 is defined as “D3”, for example, is recorded in the second management area 5.

  By the way, in the conventional CD-DA format, it was impossible to directly record digital audio information sampled at a sampling frequency larger than 44.1 kHz. However, in the recording apparatus to which the present invention is applied, For example, digital audio information in the CD-DA format in which the signal component on the low frequency side of the digital audio information sampled at the sampling frequency of 88.2 kHz is down-sampled to reduce the number of bits is recorded in the first recording area, A CD-R disc in which digital audio information obtained by compressing the signal component on the high frequency side is recorded in the second recording area 6 can be generated. Also, recorded digital audio information can be reproduced from the CD-R disc recorded in this way in a CD-DA format using a normal CD player.

  Further, in the conventional CD-DA format, it was impossible to directly record digital audio information quantized with a bit number of 16 bits or more or digital audio information having a data size of 16 bits or more. In the recording apparatus of the third embodiment, for example, digital audio information having a data size of 20 bits is divided into a low frequency side and a high frequency side, and the digital audio information on the low frequency side is divided into bits by sign bit mapping or the like. By dropping and compressing the high frequency side, high-bit digital audio information can be recorded as in the recording apparatus of the second embodiment, and recorded in the CD-DA format using a normal CD player. A recording medium capable of reproducing digital audio information can be realized.

  In the above description, so-called high-sampled digital audio information whose sampling frequency is higher than 44.1 kHz is band-divided at a predetermined frequency, and the obtained low-frequency data is down-sampled at a sampling frequency of 44.1 kHz. Identification indicating that the CD-R disc is sampled and recorded in the first recording area 3 and the high-frequency data is compressed using the ATRAC algorithm and recorded in the second recording area 6 As data, an information frame in which the point portion 112 of the first management area 2 is “B0” or “C0” and an information frame that is “E0” are provided, and the point portion 112 of the second management area 5 is further provided. Although a specific example in which an information frame having “D3” is provided has been described, the present invention is not limited to this specific example. Other values as recorded in the point portion 112 of the point 112 of the first management area 2 and the second management area 5 may be identification data.

  In the above description, the compression processing unit 63 compresses the high frequency side signal component using the ATRAC algorithm. However, the compression processing unit 63 is not limited to this, and compresses it using another compression algorithm. Also good. Further, down-sampling may be performed so as to reduce the number of bits without compression, and quantization may be performed so that data in the CD-ROM format is obtained.

  Next, a description will be given of a first embodiment of a reproducing apparatus to which the present invention is applied.

  The playback apparatus of the first embodiment manages, for example, a first recording area 3 in which digital audio information is recorded and digital audio information recorded in the first recording area 3 as shown in FIG. A first management area 2 in which information for recording is recorded, a second recording area 6 in which digital audio information corresponding to the digital audio information recorded in the first recording area 3 is recorded, and the second A playback apparatus for playing back digital audio information from a CD-R disc 1 having a second management area 5 in which information for managing the digital audio information recorded in the recording area 6 is recorded. As shown in FIG. 1, the optical pickup 70 and the signal processing unit 71 for reproducing digital audio information from the CD-R disc 1, and the first recording by the optical pickup 70. The first memory 72 that stores the digital audio information read from the area 3, the second memory 73 that stores the digital audio information read from the second recording area 6 by the optical pickup 70, and the first memory 72 A first determination unit 74 that determines whether or not the amount of data stored is greater than or equal to a predetermined amount, and a second determination that determines whether or not the amount of data stored in the second memory 73 is greater than or equal to a predetermined amount Unit 75, servo circuit unit 77 that moves optical pickup 70, and optical pickup 70 is moved to second recording area 6 based on information in first management area 2 and read from second recording area 6. Digital audio information is stored in the second memory 73, and when the second determination unit 75 determines that the amount of data stored in the second memory 73 is greater than or equal to a predetermined amount, the second memory 73 The optical pickup 70 is moved to the first recording area 3 where the digital audio information corresponding to the stored digital audio information is recorded, and the digital audio information read from the first recording area 3 is stored in the first memory 72. And a control unit 76 that performs control to store and output digital audio information from the first memory 72 and the second memory 73 in synchronization.

  As described above, in the CD-R disc 1, data in the CD-DA format is recorded in the first session 9 having the first management area 2 and the first recording area 3, and the second management area. The second session 10 having 5 and the second recording area 6 is a multi-session optical disc in which data in the CD-ROM format is recorded.

  The optical pickup 70 reads data from the CD-R disc 1 and supplies the obtained reproduction signal to the signal processing unit 71. Further, the optical pickup 70 accesses the first recording area 3 or the second recording area 6 based on a servo control signal from a servo circuit unit 77 described later. Here, the access time from the first session 9 to the second session 10 of the CD-R disc 1 and the access time of the optical pickup 70 from the second session 10 to the first session 9 are, for example, 1 second. is there.

  The signal processing unit 71 extracts identification data indicating the type of the CD-R disc 1 obtained from the first management area 2 or the second management area 5 from the reproduction signal, and supplies the identification data to the control unit 76. And the control part 76 controls the signal processing part 71 grade | etc., Based on this identification data. Specifically, the signal processing unit 71 performs signal processing for the CD-DA format on the reproduction signal obtained by reading the first session 9 under the control of the control unit 76, and obtains the obtained digital signal. The audio information is supplied to the first memory 72, predetermined signal processing is performed on the reproduction signal obtained by reading the second session 10, and the obtained digital audio information is supplied to the second memory 73.

  For example, as will be described later, when the CD-R disc 1 recorded by the recording apparatus of the first embodiment is reproduced, the CD-R disc 1 to be reproduced is a disc having the second session 10. The data recorded in the second recording area 6 is compressed using the ATRAC algorithm, and the information frame in which the point portion 112 is “B0” or “C0” is stored in the first management area 2. However, an information frame in which the point portion 112 is “D1” is recorded in the second management area 5. When the signal processing unit 71 detects these information frames, the signal processing unit 71 supplies identification data for identifying the information frames to the control unit 76. The control unit 76 controls the signal processing unit 71 with a control signal corresponding to the identification data, and the signal processing unit 71 expands the data corresponding to the second recording area 6 and converts the obtained digital audio information into the second digital audio information. To the memory 73.

  The first memory 72 temporarily stores digital audio information corresponding to the first recording area 3 supplied from the signal processing unit 71. In addition, the first memory 72 supplies the data indicating the amount of stored data taken in to the first determination unit 74 and stores the stored digital audio information based on the memory control signal from the control unit 76. Read and supply to the reproduction output unit 79. The second memory 73 temporarily stores digital audio information corresponding to the second recording area 6 from the signal processing unit 71. Further, like the first memory 72, the second memory 73 supplies the data indicating the acquired accumulated data amount to the second determination unit 75 and based on a memory control signal from the control unit 76. The stored digital audio information is read out and supplied to the reproduction output unit 79.

  That is, based on the data indicating the amount of accumulated data sent from the first memory 72, the first determination unit 74 determines whether the amount of accumulated data in the first memory 72 has reached a predetermined amount, for example, an allowable storage amount. And determining data indicating the determination result is supplied to the control unit 76. Similarly, the second determination unit 75 determines that the amount of data stored in the second memory 73 reaches a predetermined amount, for example, an allowable storage amount, based on the data indicating the amount of stored data sent from the second memory 73. It is discriminated whether or not it has been made, and discrimination data indicating the discrimination result is supplied to the controller 76. Here, the first and second discriminating units 74 and 75 are provided independently of the first and second memories 72 and 73, but these are provided in the memories 72 and 73 or controlled. You may make it provide in the inside of the part 76. FIG.

  Here, the operation of the reproducing apparatus of the first embodiment, that is, the reproducing method to which the present invention is applied will be described with reference to, for example, the flowchart shown in FIG.

  In the reproduction method to which the present invention is applied, the first recording area 3 in which the digital audio information is recorded and the information for managing the digital audio information recorded in the first recording area 3 are recorded. 1 management area 2, a second recording area 6 in which digital audio information corresponding to the digital audio information recorded in the first recording area 3 is recorded, and a digital audio recorded in the second recording area 6 14. A reproduction method for reproducing digital audio information from a recording medium having a second management area 5 in which information for managing information is recorded, as shown in FIG. 14, information in the first management area 2 , And whether or not the second recording area 6 exists based on the read management information is determined in steps S1 and S2, and the second recording area 6 exists in steps S1 and S2. If it is determined, step S6 for moving the optical pickup 70 to the second management area 5, and the information of the second management area 5 is read by the optical pickup 70 moved in step S6. The digital audio information in the recording area 6 is read, the read digital audio information is stored in the first memory 72, and the second memory stored in the first memory 72 in steps S12 to S14. Step S15 of moving the optical pickup 70 to the data recording position in the first recording area 3 where the digital audio information corresponding to the digital audio information from the recording area 6 is recorded, and the optical pickup 70 moved in step S15 The digital audio information in the first recording area 3 is read out by Step S16 for storing the digital audio information in the second memory 73 and outputting the digital audio information stored in the first memory 72 and the digital audio information stored in the second memory 73 in synchronization with each other. , S17.

  Further, in this reproduction method, when it is determined in step S18 that the amount stored in the second memory and a predetermined value are compared, and in step S18, the amount stored in the second memory exceeds the predetermined value, the first memory In step S20 and step S20, the optical pickup 70 is moved to the data recording position in the second recording area 6 where the digital audio information continued to the digital audio information stored in 72 is recorded, and the digital audio information is read out. The digital audio information of the second recording area 6 read in this way is stored in the first memory 72, and the digital audio information stored in the first memory 72 and the digital audio information stored in the second memory 73 are stored. Are output in synchronization with each other.

  In this reproduction method, the reproduction operation of the CD-R disc 1 is started in step S0, and in step S1, the optical pickup 70 accesses the first management area 2 to reproduce information.

  That is, the control unit 76 supplies a servo circuit control signal to the servo circuit unit 77 to control the access operation of the optical pickup 70.

  In step S2, the control unit determines whether or not there is an information frame in which the data PO shown in FIG. 5 is “B0” in the management information supplied from the optical pickup 70 (hereinafter referred to as first management information). A determination is made at 76. That is, it is determined whether or not the disc being played is a multi-session disc. If the determination result is NO, that is, if the disc being played is a single session disc, the process proceeds to step S3, and the playback device performs a normal disc playback process.

  On the other hand, if the determination result in step S2 is YES, that is, if it is determined that the disc being played is a multi-session disc, the process proceeds to step S4, and this time the data PO is included in the first management information. The control unit 76 determines whether or not there is an information frame “E0”. The determination result is NO, that is, the disc being played is a disc in which only character data is recorded in the second management area 5 of the second session 10 and no data is recorded in the second recording area 6. If it is determined that there is, the process proceeds to step S5, and the playback apparatus performs a playback process of a so-called disk with characters.

  If the determination result in step S4 is YES, that is, if it is determined that the disc being played is a CD-R disc, the process proceeds to step S6 and is based on the address information indicated in the first management information. Thus, the optical pickup 70 accesses the second management area 5. That is, the control unit 76 supplies a servo circuit control signal to the servo circuit unit 77 to control the access operation of the optical pickup 70.

  In step S7, the optical pickup 70 reproduces the second management area 5, and the process proceeds to step S8.

  In step S8, the control unit 76 stores the data contents of the second management area 5 (hereinafter referred to as second management information) in the internal memory, the process proceeds to step S9, and the playback device waits for command input. It becomes a state and stops once.

In step S10, when the control unit 76 determines that there is a command input, the process proceeds to step S11, the control unit 76 temporarily cancels the stop, and the process proceeds to step S12.
In step S <b> 12, the control unit 76 supplies a servo circuit control signal to the servo circuit unit 77 based on the address information of the second management information, and the optical pickup 70 accesses the second recording area 6.

  In step S13, the signal processing unit 71 performs a CD-ROM format descrambling process for the second recording area 6 recorded according to the CD-ROM standard, and a CD-ROM process such as error correction and address process. . That is, the control unit 76 sends a control signal that causes the signal processing unit 71 to perform processing.

  In step S14, the second memory 73 takes in reproduction data obtained by CD-ROM processing. That is, the control unit 76 supplies a processing control signal to the signal processing unit 71 and supplies a memory control signal to the second memory 73.

  In step S <b> 15, the optical pickup 70 accesses the first recording area 3 based on the address where the digital audio information corresponding to the reproduction data fetched into the second memory 73 is recorded. That is, the control unit 76 supplies a servo circuit control signal to the servo circuit unit 77 to control the access operation of the optical pickup 70.

  In step S16, the optical pickup 70 reproduces and outputs the reproduction data from the first recording area 3 accessed in step S15. Further, the first memory 72 takes in this reproduction data. That is, the control unit 76 supplies a processing control signal for causing the signal processing unit 71 to perform processing, and supplies a memory control signal to the first memory 72.

  In step S <b> 17, the first memory 72 and the second memory 73 read the stored digital audio information for each predetermined data amount, and supplies the read digital audio information to the reproduction output unit 79. The reproduction output unit 79 mixes and supplies the supplied digital audio information. That is, the control unit 76 supplies a memory control signal to the first memory 72 and the second memory 73 and supplies a reproduction control signal to the reproduction output unit 79.

  During this time, reproduction data obtained by reproducing the first recording area is sent from the signal processing unit 71 to the first memory 72 and stored therein.

  In step S18, the control unit 76 determines whether or not the first memory 72 has reached the data storage allowable amount. When the determination result is NO, that is, when it is determined that there is an empty area in the first memory 72, The process proceeds to step S19.

  In step S19, the optical pickup 70 continues the reproduction of the first recording area 3, and the first memory 72 stores the reproduction data from the optical pickup 70. That is, the control unit 76 supplies a servo circuit control signal to the servo circuit unit 77 to control the access operation of the optical pickup 70, supplies a processing control signal to the signal processing unit 71, and stores the memory in the first memory 72. Supply control signals. Then, the process returns to step S17.

  On the other hand, if the determination result in step S18 is YES, that is, if the control unit 76 determines that the first memory 72 has reached the data storage allowable amount, the process proceeds to step S20.

  In step S20, the optical pickup 70 accesses the subsequent address of the second recording area 6 and reproduces the data. That is, the control unit 76 supplies a servo circuit control signal to the servo circuit unit 77 and controls the access operation of the optical pickup 70.

  In step S21, the second memory 73 takes in the reproduction data of the second recording area 6 reproduced by the optical pickup 70 in step S20. That is, the control unit 76 supplies a processing control signal to the signal processing unit 71 and supplies a memory control signal to the second memory 73.

  In step S <b> 22, the first memory 72 and the second memory 73 read the stored digital audio information for each predetermined amount of data and supply the read digital audio information to the reproduction output unit 79. The reproduction output unit 79 mixes and supplies the supplied digital audio information. Therefore, the control unit 76 supplies a memory control signal to the first memory 72 and the second memory 73 and supplies a reproduction control signal to the reproduction output unit 79. During this time, the reproduction data obtained by reproducing the second recording area 6 is sent from the signal processing unit 71 to the second memory 73 and accumulated.

  In step S23, the control unit 76 determines whether or not the second memory 73 has reached the data storage allowable amount. If the determination result is NO, that is, if it is determined that there is an empty area in the second memory 73, the process returns to step S21, and the determination result is YES, that is, the second memory 73 has reached the data storage allowable amount. If so, the process proceeds to step S24.

  In step S24, the optical pickup 70 accesses the address following the first recording area 3 and reproduces the data. That is, the control unit 76 supplies a servo circuit control signal to the servo circuit unit 77 and controls the access operation of the optical pickup 70.

  In step S25, the determination unit 76 determines whether or not the reproduction of the first recording area 3 is completed, or whether or not there is a command input for a stop operation. If the determination result is NO, that is, it is determined that unreproduced digital audio information exists in the first recording area 3 and it is determined that there is no command input for a stop operation, the process proceeds to step S26.

  In step S <b> 26, the optical pickup 70 continues to reproduce the first recording area 3, and the first memory 72 accumulates reproduction data from the optical pickup 70. In other words, the control unit 76 supplies a servo circuit control signal to the servo circuit unit 77 to control the access operation of the optical pickup 70, and also supplies a processing control signal to the signal processing unit 71 to the first memory 72. Supply memory control signals. Then, the process returns to step S17.

  On the other hand, if the determination result is YES, that is, it is determined that the reproduction of the digital audio information in the first recording area 3 is completed, or a command for stop operation is input, the process proceeds to step S27, and this reproduction is performed. The device ends the playback operation.

  In the case of a CD-R disc in which the time code is added to the second recording area 6 in the CD-ROM format, the reproduction data from the first memory 72 and the second memory 73 in step S17 and step S22. Even if the reproduction data from the first memory 72 and the second memory 73 are simultaneously read out, the digital audio information can be synchronized and output without taking out the reproduction data from the first and second memories 73 and 73 at the same time.

  In the reproduction method as shown in FIG. 14, in order to temporarily read the read data into the memory and output the data from the memory, the data writing speed when writing to the memory is higher than the data reading speed. It is a condition.

  Therefore, the speed at which the digital audio information is written into the first memory 72 is faster than the speed at which the digital audio information is read from the first memory, and the speed at which the digital audio information is written into the second memory 73 is from the second memory. It must be faster than reading digital audio information.

  Here, the CD-DA format data is recorded in the first recording area 3 with respect to the writing speed and reading speed in the first memory 72, and the writing speed and reading speed in the second memory 73, and the second An example of a reproducing method for reproducing a CD-R disc on which compressed data compressed using the ATRAC algorithm is recorded in the recording area 6 will be described.

  The data reading speed at the time of reproduction defined in the normal CD system is 1.4112 Mbit / sec. Since the compressed data compressed using the ATRAC algorithm as described above is compressed to a data size of about 1/5, the reading speed of the compressed data from the second memory 73 is 0.2822 ( = 1.4112 × (1/5)) M bits / second.

  In order to satisfy the conditions as described above, the data reading speed from the first memory 72 for capturing the digital audio information of the first recording area 3 during reproduction is 1.4112 (M bits / second). The data writing speed to the memory 72 of 1 needs to be 1.4112 (M bits / second) or more. The data reading speed from the second memory 73 for capturing the digital audio information in the second recording area 6 when reproducing in synchronization with the digital audio information in the first recording area 3 is 282.2 (= 1) 4112 (M bits / second) × (1/5)) K bits / second, the data writing speed to the second memory 73 needs to be 282.2 K bits / second or more.

  Therefore, the data write speed (hereinafter also referred to as the first write speed) to the first memory 72 is the data read speed (hereinafter also referred to as the first read speed) from the first memory 72. The data write speed (hereinafter also referred to as the second write speed) to the second memory is set to the data read speed (hereinafter referred to as the second write speed) (hereinafter referred to as the second write speed). The description will be made on the assumption that it is 20 times the second reading speed, that is, 5.6448 (M bits / second).

The first memory 72 is, for example, as shown in FIG. 15A, will store the data from the address A ₀ in this order, and is repeated in a cycle with it. Second memory 73, for example, as shown in FIG. 15B, similarly to the first memory 72, will store the data from the address A ₀ in this order, and is repeated at a certain frequency it. Note that the allowable storage amount of data in the first memory 72 and the second memory 73 is 16.38 Mbits.

Further, a write vector W ₁ is defined as indicating the direction and address in which data is written in order from the address A ₀ to the first memory 72, and the data is read in order from the address A ₀ of the first memory 72. as indicating the direction and address, defining the read vector R _1. Furthermore, as for the second memory 73, defines the write vector _{W 2} and read vector _{R 2.} In general, when the memory capacity is m, the data writing speed to this memory is W, and the data reading speed from this memory is r (where w> r), the time T for the memory to reach the data storage allowable amount is The following formula 1 is obtained.

T = m / (wr) Formula 1
According to Equation 1, the time T ₁ until the first memory 72 reaches the data storage allowance is 3.8690 (= 16.38 / (5.6448-1.4112)) seconds, that is, approximately 3. 9 seconds. On the other hand, the time T ₂ until the second memory 73 reaches the data storage allowable amount is 3.0545 (= 16.38 / (5.6448−0.2822)) seconds, that is, approximately 3.1 seconds. .

Further, since the first writing speed is four times the first reading speed and the second writing speed is 20 times the second reading speed, the speed at which the write vector W ₁ advances is the read vector R _1. It is four times the speed at which the process proceeds, also the speed of light vector W ₂ progresses, a 20-fold speed read vector R ₂ progresses.

  Here, the timing at which digital audio information is extracted from each recording area and reproduced is schematically shown by the number line in FIG.

In this number line, to start playing, a first management area 2 of the data, and the data of the second management area 5, after capturing the control unit 76 of the reproducing apparatus shown in FIG. 13, the time t ₀ From time to time t ₁ , the optical pickup 70 accesses the second recording area 6 from the first recording area 3 based on the data in the second management area 5.

In the section l ₁ from time t ₁ to time t _2, the reproduction data from the second recording area 6 is written into the second memory 73. Between time t ₂ and time t ₃ , the optical pickup 70 accesses the first recording area 3 from the second recording area 6.

In addition, in the section l ₂ from the time t ₃ to the time t ₄ , the reproduction data from the first recording area 3 is written in the first memory 72. The optical pickup 70 accesses the second recording area 6 from the first recording area 3 between time t ₄ and time t ₅ .

In a section l ₃ from time t ₅ to time t ₆ , reproduction data from the second recording area 6 is written into the second memory 73. Between time t ₆ and time t ₇ , the optical pickup 70 accesses the first recording area 3 from the second recording area 6.

Further, in the section l ₄ from the time t ₇ to the time t ₈ , the reproduction data from the first recording area 3 is written into the first memory 72. The optical pickup 70 accesses the second recording area 6 from the first recording area 3 between time t ₈ and time t ₉ .

It is assumed that the reproduction operation starts at time t ₁ and the reproduction data is actually output at time t ₃ .

  The access time between the first recording area 3 and the second recording area 6 is 1 second as described above.

The section l ₁ is 0.3 seconds, for example, and data is taken into the second memory 73 from the second recording area 6 in the section l ₁ . Further, since the write vector W ₂ has a speed 20 times that of the read vector R ₂ , the reproduction data for 6 (= 3 × 20) seconds is captured in the second memory 73. That is, 6 seconds from the time t ₂ is not necessary to take the data from the second recording area 6 to the second memory 73.

The section l ₂ starts from the section l ₅ , that is, after 1.3 (= 0.3 + 1) seconds from the start of the reproduction operation, and the time period T until the first memory 72 reaches the data storage allowable amount as described above. ₁ is 3.9 seconds, and data is taken into the first memory 72 from the first recording area 3 in this section l ₂ . Further, since the write vector W ₁ has a speed four times that of the read vector R ₁ , the reproduction data for 15.6 (= 3.9 × 4) seconds has been taken into the first memory 72. but this time, from the start of the section l ₂ as described above, since the output of the read data from the first memory 72b is started at the time of data capture ends, i.e. at time t _4, the first memory Thus, the reproduction data for 11.7 (= 15.6-3.9) seconds remains in 72.

The interval l ₃ starts from the time t ₃ after the interval l ₆ , that is, 4.9 (= 3.9 + 1) seconds, and the time T ₂ until the second memory 73 reaches the data storage allowable amount as described above. Is 3.1 seconds, and data is taken into the second memory 73 from the second recording area 6 in this section l ₃ . Here, the time t ₅ at which the data acquisition into the second memory 73 is started again is 1 _second from the time t ₂ at which the data acquisition into the second memory 73 was previously stopped, and the interval l _6, that is, 4. 9 (= 3.9 + 1) seconds and 5.9 (= 1 + 4.9) seconds have elapsed, but since this elapsed time is 6 seconds or less, the second memory 73 has There is no emptying in interval l ₆ .

Incidentally, in the section l _3, the second memory 73, 62 (= 3.1 × 20 ) but seconds worth of playback data will be captured, the data read operation is continued, data capture At the end, that is, at time t ₆ , the reproduction data for 58.9 (= 62-3.1) seconds remains in the second memory 73.

Further, the interval _{l 4} is fetches once 3.9 seconds data to the first memory 72 from the first recording area 3, the operation such 15.6 seconds data from the first memory 72 to output twice Done. That is, the interval _{l 4} is 35.1 (= 15.6 + 15.6 + 3.9) sec. Here, the time t ₄ at which the data acquisition into the first memory 72 is started again is the interval l _7, that is, 5.1 (= 1 + 3) from the time t ₄ at which the data acquisition into the first memory 72 was previously stopped. .1 + 1) seconds have passed by, the elapsed time, since it is less 11.7 seconds above, the first memory 72 does not become empty in this interval l _7. The time at which the section l ₇ is completed, that is, from the time t _8, so that the 11.7 seconds of the reproduction data is taken first memory 72.

Furthermore, from the time t _9, although the data incorporation into the second memory 73 is started, the time t _9, the data incorporation into the second memory 73 stopped time, that is, from the time t ₆ before, The interval l _8, that is, 37.1 (= 1 + 35.1 + 1) seconds have elapsed, but since this elapsed time is equal to or less than the above 58.9 seconds, the second memory 73 is emptied in this interval l _8. Never become.

As described above, by continuing the operation in the section l ₉ from the time t ₅ to the time t _9, data is reproduced from the first recording area 3 and the second recording area 6 without interruption of sound. , Can be output in synchronization. That is, the interval l ₉ is 40.2 (= 3.1 + 1 + 35.1 + 1) seconds.

  In the above description, the disc to be reproduced has a plurality of recording areas, data in the CD-DA format standard is recorded in the first recording area 3, and data in the CD-ROM format standard is recorded in the second recording area 6. As a CD-ROM format standard data, a CD-R disc on which data compressed using the ATRAC algorithm is recorded has been described as an example. It may be used.

In the above description, the speed at which the data taken out from the disk is written into the memory is four times as high as the speed at which the data is taken out from the memory. . In addition, although the memory capacity is 16M bits, the present invention is not limited to this, and a memory having an arbitrary capacity can be used. However, it goes without saying that when these values change, the lengths of the sections l _{1 to} l ₉ shown in FIG. 16 also change. For example, the larger the memory used, the longer the length of each section can be set.

  Here, the other part of the reproducing apparatus shown in FIG. 13 will be described.

  The servo circuit unit 77 supplies a focus servo control signal, a tracking servo control signal, and a thread servo control signal to the optical pickup 70 in accordance with the servo circuit control signal as described above supplied from the control unit 76, and the optical pickup 70 servo control is performed. The servo circuit 77 supplies a rotation servo control signal to the spindle motor 78 to control the rotation of the spindle motor 78.

  It is essential that the spindle motor 78 rotates faster than the spindle motor of a normal CD player. As described above, the rotation speed of the spindle motor 78 is set to a normal CD player in order to make the speed at which the reproduction data is written into the memory for fetching data from the recording medium four times the speed at which the reproduction data is read from the memory. 4 times the rotational speed of the spindle motor. Further, the spindle motor 78 may be rotated at a high speed. Thus, by rotating the spindle motor 78 faster than the spindle motor of a normal CD player, digital audio information can be reproduced from the CD-R disc 1 by the above-described reproduction method.

  The reproduction output unit 79 includes a synthesis part, a digital / analog converter, an audio amplifier, and the like. The synthesizing portion synthesizes the digital audio information from the first memory 72 and the digital audio information from the second memory 73 on the basis of the reproduction control signal from the control unit 76 while synchronizing the digital / The analog converter converts the synthesized digital audio information into an analog audio signal, and the audio amplifier amplifies the audio signal and outputs it through the output terminal 80.

  A modification of the first embodiment of the playback apparatus to which the present invention is applied will now be described.

  In this playback apparatus, the digital audio information recorded in the first recording area 3 of the first session 9 of the CD-R disc 1 is digital audio information of two channels, for example, the front channel, and the second session 10 The digital audio information recorded in the second recording area 6 is digital audio information of two channels corresponding to the digital audio information recorded in the first recording area 3, for example, the rear channel. The digital audio information is reproduced from the CD-R disc 1. The digital audio information recorded in the second recording area 6 is digital audio information compressed by, for example, an ATRAC algorithm.

  In the reproducing apparatus of this modification, for example, as shown in FIG. 17, the optical pickup 70 accesses the CD-R disc 1 by a focus servo control signal, a tracking servo control signal, and a thread servo control signal from the servo circuit unit 77. To do. Then, the data on the CD-R disc 1 is read by the optical pickup 70, supplied to the RF circuit 131 as an RF signal, and after waveform shaping and binarization, it is sent to the CD signal processing and time axis synchronization circuit 132. Supplied.

  When the management information recorded in the first management area 2 and the second management area 5 in the data from the RF circuit 131 is input, the CD signal processing and time axis synchronization circuit 132 receives the management information. It supplies to the control part 76. When the program data (digital audio information) recorded in the first recording area 3 and the second recording area 6 is input, the CD signal processing and time axis synchronization circuit 132 receives the CD signal processing, that is, CD- The DA format data is EFM demodulated, and the obtained reproduction data is supplied to the first memory 72.

  On the other hand, when CD-ROM format data is input, the CD signal processing and time axis synchronization circuit 132 performs EFM demodulation on the CD-ROM format data and supplies the obtained data to the CD-ROM signal processing circuit 133. To do.

  Further, the CD signal processing and time axis synchronization circuit 132 reads the reproduction data from the first memory 72 based on the processing control signal and the memory control signal from the control unit 76, and outputs them through the front channel output terminal 137. .

  The first memory 72 has a capacity of 16 Mbits, for example, and temporarily stores reproduction data corresponding to the data recorded in the first recording area 3.

  Then, the CD-ROM signal processing circuit 133 performs error correction on the CD-ROM format data from the CD signal processing and time axis synchronization circuit 132 using an error correction code for the CD-ROM format, address information, etc. Is detected.

  Then, the CD-ROM signal processing circuit 133 supplies the obtained reproduction data to the second memory 73 via the memory control circuit 135 and the address information to the control unit 76. That is, the ROM 134 connected to the CD-ROM signal processing circuit 133 has a capacity of, for example, 64K bits, and the ROM 134 stores data and programs for error correction and detection of address information. Then, the CD-ROM signal processing circuit 133 performs error correction and address detection according to these data and programs.

  The memory control circuit 135 supplies reproduction data supplied from the CD-ROM signal processing circuit 133, that is, reproduction data obtained from the second recording area 6, to the second memory 73. Further, the memory control circuit 135 reads the reproduction data from the second memory 73 in accordance with the memory control signal from the control unit 76 and supplies it to the compression decoding processing circuit 136. The second memory 73 has a 16 Mbit capacity, for example, similarly to the first memory 72, and temporarily stores reproduction data corresponding to the data recorded in the second recording area 6.

  The compression decoding processing circuit 136 demodulates the reproduction data read from the second memory 73, that is, the data compressed to a data size of about 1/5 using the ATRAC algorithm, The data is output via the channel output terminal 138.

  The control unit 76 generates a servo circuit control signal for controlling the access operation of the optical pickup 70 to the CD-R disc 1 based on the management information and reproduction data supplied from the CD signal processing and time axis synchronization circuit 132. The servo circuit control signal is supplied to the servo circuit unit 77, and a process control signal for controlling the data processing in the CD signal processing and time axis synchronization circuit 132 and the CD-ROM signal processing circuit 133 is generated. This is supplied to the CD-ROM signal processing circuit 133. In addition, the control unit 76 generates a memory control signal for extracting reproduction data from the first memory 72 and supplies the memory control signal to the CD-ROM signal processing circuit 133 via the CD signal processing and time axis synchronization circuit 132. Further, a memory control signal for taking out reproduction data from the second memory 73 is supplied to the memory control circuit 135. The control unit 76 generates a demodulation control signal for controlling the demodulation operation in the compression decoding processing circuit 136 based on the CD-ROM format data from the CD-ROM signal processing circuit 133, and the compression decoding processing circuit 136. To supply.

  The servo circuit unit 77 generates a focus servo control signal, a tracking servo control signal, and a thread servo control signal based on the servo circuit control signal supplied from the control unit 76, and the optical pickup 70 with respect to the CD-R disk 1 is generated. Control access behavior. Further, a rotation servo control signal for controlling the rotation operation of the spindle motor 78 is generated and supplied to the spindle motor 78.

  As described above, the spindle motor 78 has a higher rotational speed than the spindle motor of a normal CD player, and rotates at a quadruple speed, for example.

  In this reproducing apparatus, when the CD-R disc 1 in which the digital audio information of the front channel is recorded in the first recording area 3 and the digital audio information of the rear channel is recorded in the second recording area 6 is reproduced. The data of each recording area is read by the optical pickup 70, and the data from the first recording area 3 is processed by the CD signal processing and time axis synchronization circuit 132 and temporarily stored in the first memory 72. Data from the second recording area 6 is subjected to CD signal processing and EFM demodulation processing by the time axis synchronization circuit 132 and then temporarily stored in the second memory 73 via the memory control circuit 135.

  The control unit 76 retrieves the reproduction data captured in the first memory 72 and the reproduction data captured in the second memory 73 in synchronization with each other based on the memory control signal, and reproduces the reproduction data from the first memory 72. The data is output via the front channel output terminal 137, the reproduction data from the second memory 73 is demodulated by the compression decoding processing circuit 136, and then output via the rear channel output terminal 138.

  Next, another modification of the first embodiment of the reproducing apparatus will be described.

  In this reproducing apparatus, the digital audio information recorded in the first recording area 3 of the first session 9 of the CD-R disc 1 is obtained by sampling an audio signal at a predetermined sampling frequency, for example, 88.2 kHz. Thereafter, the digital audio information quantized with a predetermined number of bits, for example, 16 bits, is divided into bands at a predetermined frequency, for example, 22 kHz, and the digital audio information of the low-frequency side loop of, for example, 0 kHz to 22 kHz is determined with a predetermined sampling frequency. Digital audio information sampled at a lower sampling frequency, for example, 44.1 kHz, and the digital audio information recorded in the second recording area 6 of the second session 10 is on the high frequency side of 22 kHz to 44 kHz. Digitally compressed group digital audio information using, for example, ATRAC algorithm A Dio information, the playback apparatus is composed of a CD-R disc 1 to reproduce the digital audio information.

  Here, FIG. 18 shows the configuration of the reproducing apparatus of the second modification. In the following description, the same reference numerals are assigned to the same circuits as those in the playback apparatus shown in FIG.

  The output from the optical pickup 70 is supplied to the CD signal processing and time axis synchronization circuit 132 via the RF circuit 131 as described above. The access operation of the optical pickup 70 is controlled by a servo control signal from the servo circuit unit 77.

  The CD signal processing and time axis synchronization circuit 132 demodulates the data from the first recording area 3 and stores it in the first memory 72 as reproduction data of the CD-DA format standard. Further, the CD signal processing and time axis synchronization circuit 132 performs EFM demodulation on the data from the second recording area 6 and supplies it to the CD-ROM signal processing unit 133. Further, the CD signal processing and time axis synchronization circuit 132 extracts reproduction data from the first memory 72 based on the memory control signal from the control unit 76 and supplies the reproduction data to the oversampling circuit 140. The operation of the CD signal processing and time axis synchronization circuit 132 is controlled by a processing control signal from the control unit 76.

  Here, the oversampling circuit 140 will be described.

  As described above, the digital audio information recorded in the first recording area 3 is a portion from 0 kHz to 22 kHz of data sampled at 88.2 kHz. On the other hand, CD-DA format standard data, that is, data sampled at a sampling frequency of 44.1 kHz is input to the oversampling circuit 140. Therefore, the oversampling circuit 140 oversamples data in the CD-DA format standard at a sampling frequency of, for example, 88.2 kHz, and supplies the obtained oversampling data to the band synthesis circuit 141.

  On the other hand, the CD-ROM signal processing circuit 133 performs error correction and address processing of the data recorded in the second recording area 6 as described above, and obtains the reproduced data through the memory control circuit 135. 2 and the address information are supplied to the controller 76. Note that the operation of the CD-ROM signal processing circuit 133 is controlled based on a processing control signal from the control unit 76.

  The memory control circuit 135 stores the reproduction data from the CD-ROM signal processing circuit 133 in the second memory 73, and reads the reproduction data from the second memory 73 based on the memory control signal from the control unit 76. , And supplied to the compression decoding processing circuit 136.

  Since the reproduction data read from the second memory 73 is compressed by using the ATRAC algorithm, the compression decoding processing circuit 136 demodulates and supplies the obtained data to the band synthesis circuit 141. Note that the data obtained by demodulation is a 22 kHz to 44 kHz portion of digital audio information sampled at 88.2 kHz. The compression decoding processing circuit 136 is controlled based on the demodulation control signal from the control unit 76.

  The band synthesizing circuit 141 receives data of 0 kHz to 22 kHz sampled at the sampling frequency of 88.2 kHz supplied from the oversampling circuit 140 and the sampling frequency of 88.2 kHz supplied from the compression decoding processing circuit 136. The sampled data of 22 kHz to 44 kHz is synthesized, and digital audio information in the range of 0 kHz to 44 kHz sampled at a sampling frequency of 88.2 kHz is output via the digital audio information output terminal 139. It should be noted that the extraction of the reproduction data from the first memory 72 and the extraction of the reproduction data from the second memory 73 are controlled by the control unit 76, and the band synthesizing circuit 141 is in a timely state. In this case, since digital audio information corresponding to each other is input, it is not necessary to synchronize.

  Next, a third modification of the first embodiment of the playback apparatus will be described.

  In this playback apparatus, the digital audio information recorded in the first recording area 3 of the first session 9 of the CD-R disc 1 is obtained by sampling an audio signal at a predetermined sampling frequency, for example, 44.1 kHz. Thereafter, digital audio information that is higher-order digital audio information quantized with a predetermined number of bits, for example, 20 bits, such as 16-bit digital audio information, and is recorded in the second recording area 6 of the second session 10 Is digital audio information of the lower 4 bits of the quantized digital audio information, and this playback apparatus plays back the digital audio information from the CD-R disc 1.

  Here, FIG. 19 shows the configuration of the reproduction apparatus of the third modification. In the following description, the same reference numerals are given to the same circuits as those in the reproducing apparatus in FIG.

  The output from the optical pickup 70 is supplied to the CD signal processing and time axis synchronization circuit 132 via the RF circuit 131 as described above. The access operation of the optical pickup 70 is controlled by a servo control signal from the servo circuit unit 77.

  The CD signal processing and time axis synchronization circuit 132 demodulates the data from the first recording area 3 and stores it in the first memory 72 as reproduction data of the CD-DA format standard. Further, the CD signal processing and time axis synchronization circuit 132 performs EFM demodulation on the data from the second recording area 6 and supplies it to the CD-ROM signal processing unit 133. Further, the CD signal processing and time axis synchronization circuit 132 extracts the reproduction data from the first memory 72 based on the memory control signal from the control unit 76 and sends it to the data synthesis unit 142. The data obtained here is the upper 16 bits of 20-bit digital audio information sampled at a sampling frequency of 44.1 kHz, and only this part can be output as a reproduction output. The operation of the CD signal processing and time axis synchronization circuit 132 is controlled by a processing control signal from the control unit 76.

  As described above, the CD-ROM signal processing circuit 133 performs error correction and address processing on the data recorded in the second recording area 6, and obtains the reproduction data obtained through the memory control circuit 135 through the second control data 135. The address information is supplied to the control unit 76 while being supplied to the memory 73. Note that the operation of the CD-ROM signal processing circuit 133 is controlled based on a processing control signal from the control unit 76.

  The memory control circuit 135 stores the reproduction data from the CD-ROM signal processing circuit 133 in the second memory 73, and reads the reproduction data from the second memory 73 based on the memory control signal from the control unit 76. To the data synthesis unit 142. The data output from the memory control circuit 135 is the lower 4 bits of 20-bit digital audio information sampled at a sampling frequency of 44.1 kHz.

  The data synthesizing unit 142 synthesizes the upper 16 bits of data from the CD signal processing and time axis synchronization circuit 132 and the lower 4 bits of data from the memory control circuit 135, and samples the audio signal with a sampling frequency 44. 20-bit digital audio information sampled at 1 kHz is generated and output via the digital audio information output terminal 143. It should be noted that the extraction of the reproduction data from the first memory 72 and the extraction of the reproduction data from the second memory 73 are controlled by the control unit 76, and the data synthesizing unit 142 is in a timely state. In this case, since digital audio information corresponding to each other is input, it is not necessary to synchronize.

  By the way, in any of the first to third modifications, the data in the CD-ROM format recorded in the second recording area 6 is converted into digital data including the time code of the corresponding data in the first recording area 3. As audio information, high-quality digital audio information can be reproduced by simultaneously reading out reproduction data from the first memory 72 and the second memory 73 and synthesizing with reference to the time code.

  Next, a description will be given of a second embodiment of the reproducing apparatus to which the present invention is applied.

  The reproducing apparatus of the second embodiment is recorded in the first recording area 3 in which digital audio information and address information are multiplexed and recorded, for example, as shown in FIG. A first management area 2 in which information for managing the digital audio information is recorded, and a second recording area in which the digital audio information and address information corresponding to the first recording area 3 are multiplexed and recorded. 6 and a playback apparatus for playing back digital audio information from a CD-R disc 1 having a second management area 5 in which information for managing the digital audio information recorded in the second recording area 6 is recorded. For example, as shown in FIG. 20, a first pickup 151 and a first signal processing unit for reading digital audio information and address information from the first recording area 3 53, a second pickup 152 and a second signal processing unit 154 for reading digital audio information and address information from the second recording area 6, and an internal memory for storing the digital audio information from the second signal processing unit 154 160, a control unit 155 for controlling the internal memory 160 and the second signal processing unit 154 based on the address information from the first recording area 3 and the address information from the second recording area 6, and the first The digital audio information reproduced by the pickup 151 and the digital audio information reproduced by the second pickup 152 are mixed, and the digital audio information mixed by the mixing unit 162 is converted into an analog audio signal. And a D / A converter 164 for outputting.

  As described above, the CD-R disc 1 is a multi-session optical disc in which the first session 9 is recorded in the CD-DA format and the second session 10 is recorded in the CD-ROM format.

  The first pickup 151 reads the digital audio information recorded in the first session 9 and supplies the obtained reproduction signal to the first signal processing unit 153. Further, the first pickup 151 accesses the CD-R disc 1 based on a servo control signal or a read stop signal described later from the control unit 155.

  Further, the second pickup 152 reads the digital audio information recorded in the second session 10 and supplies the obtained reproduction signal to the second signal processing unit 154. Similarly to the first pickup 151, the second pickup 152 accesses the CD-R disc 1 based on the servo control signal or the reading stop signal from the control unit 155.

  The first signal processing unit 153 binarizes the reproduction signal from the first pickup 151 and supplies the obtained data from the first management area 2 to the control unit 155, and the first recording area 3 The 16-bit digital audio information obtained is demodulated in the format specified by the CD-DA format, and the obtained 16-bit digital audio information is supplied to the mixing unit 162 via the 16-bit data path 156. The data is supplied to the internal memory 160 via the address data path 157.

  The second signal processing unit 154 binarizes the reproduction signal from the second pickup 152 and extracts identification data indicating the type of the CD-R disc 1 from the second management area 5, and this identification data Based on the above, the data from the second recording area 6 is decoded. Also, the second signal processing unit 154 supplies the obtained CD-ROM format data to the internal memory 160 via the CD-ROM format data path 158, and the address data of each data via the address data path 159. To the internal memory 160.

  The internal memory 160 temporarily stores the CD-ROM format data supplied from the second signal processing unit 154 as accumulated data, and also stores the address data supplied from the first signal processing unit 153 and the second data. Based on the address data sent from the signal processing unit 154, the 16-bit digital audio information obtained by the first signal processing unit 153 is stored while being synchronized with the output to the mixing unit 162. Data is supplied to the mixing unit 162.

  The accumulated data is also supplied to the detection unit 161, and the detection unit 161 estimates the amount of accumulated data in the internal memory 160 and supplies the obtained detection data to the control unit 155.

  The control unit 155 is based on the reproduction signal sent from the first signal processing unit 153 and the detection data sent from the detection unit 161 according to the flowchart showing the reproduction method by the reproduction apparatus of the second example shown in FIG. Then, a control signal is supplied to each part of the playback apparatus of the second example to control the operation of each part.

  Here, the operation of the reproducing apparatus of the second embodiment, that is, the reproducing method to which the present invention is applied will be described with reference to, for example, the flowchart shown in FIG.

  The reproduction method to which the present invention is applied is for managing the first recording area 3 in which digital audio information and address information are multiplexed and recorded, and the digital audio information recorded in the first recording area 3. The first management area 2 in which the above information is recorded, the second recording area 6 in which the digital audio information and the address information corresponding to the first recording area 3 are multiplexed and recorded, and the second recording A reproduction method for reproducing audio information from a CD-R disc 1 which is a recording medium having a second management area 5 in which information for managing digital audio information recorded in the area 6 is recorded. 21, the step S107 for reading the digital audio information and the address information from the first recording area 3 by the first pickup 151, and the second pick Step S108 for reading the digital audio information and address information from the second recording area 6 by the step 152, the digital audio information and address information obtained in Step S107, and the digital audio information and address information obtained in Step S108. Steps S112 and S114 for outputting digital audio information while synchronizing based on the above, and whether or not the amount of information stored in the internal memory 160 for temporarily storing the digital audio information from the second pickup 152 is greater than or equal to a predetermined value. Step S110 for determining, step S113 for controlling the second pickup 152 to a standby state when it is determined that the accumulated amount of information stored in the storage unit is greater than or equal to a predetermined value in step S110, and information in the internal memory 160 Whether the accumulated amount is less than the predetermined value A step S115 of determining, if the accumulation amount in step S115 is determined to be below a predetermined value, and a step S116 to restart controls the second pickup 152.

  In this playback method, the playback operation of the CD-R disc 1 is started in step S100, and in step S101, the control unit 155 accesses the first management area 2 to the first pickup 151. A servo control signal is supplied to cause the first pickup 151 to reproduce management information from the first management area 2. Then, the process proceeds to step S102.

  In step S102, whether or not there is an information frame in which the data PO shown in FIG. 5 is “B0” in the management information supplied from the first pickup 151 (hereinafter referred to as first management information). The determination is made by the control unit 155. That is, it is determined whether or not the disc being played is a multi-session disc. If the determination result is NO, that is, if the disc being played is a single session disc, the process proceeds to step S103, and this playback device performs a normal disc playback process.

  On the other hand, if the determination result in step S102 is YES, that is, if it is determined that the disc being played is a multi-session disc, the process proceeds to step S104, and this time the data PO is included in the first management information. It is determined whether or not there is an information frame that is “EO”. The determination result is NO, that is, the disc being reproduced is a disc in which only character data is recorded in the second management area 5 of the second session 10 and no data is recorded in the second recording area 6. Is determined, the process proceeds to step S105, and the reproducing apparatus performs a so-called character disk reproducing process.

  On the other hand, if the determination result in step S104 is YES, that is, if it is determined that the disc being played is a CD-R disc, the process proceeds to step S106, and the control unit 155 indicates the first management information. Based on the address information, the servo control signal is supplied to the second pickup 152 so as to access the second management area 5, and the second pickup 152 reproduces the second management area 5 and performs processing. Advances to step S107.

  In step S107, the control unit 155 supplies a servo control signal to the first pickup 151 so as to access the first recording area 3 based on the address information indicated by the first management information. The pickup 151 reproduces the program recorded in the first recording area 3.

  In step S108, the control unit 155 supplies a servo control signal to the second pickup 152 so as to access the second recording area 6 based on the address information indicated by the second management information. The second pickup 152 reproduces the program recorded in the second recording area 6.

  In step S 109, the control unit 155 supplies a memory control signal to the internal memory 160, and the internal memory 160 stores data obtained by reproducing the second recording area 6.

  In step S110, the control unit 155 determines based on the detection data supplied from the detection unit 161 whether or not the amount of stored data in the internal memory 160 has reached a predetermined amount, for example, an allowable storage amount, If the determination result is NO, that is, if there is a sufficient free area in the internal memory 160, the process proceeds to step S111.

  In step S111, it is determined whether or not the reproduction of the second recording area 6 has ended. If the determination result is NO, that is, if the performance has not ended, the process proceeds to step S112, and the controller 155 The address information obtained by reproducing the first recording area 3 and the address information obtained by reproducing the second recording area 6 are synchronized while the reproduction operation of the second pickup 152 is continued. Then, a memory control signal for outputting the accumulated data is supplied to the internal memory 160. Then, the process returns to step S109.

  On the other hand, if the determination result in step S111 is YES, that is, if the performance is finished, the process proceeds to step S117, and the control unit 155 sends a reading stop signal to the first pickup 151 and the second pickup 152, Stop playback. Then, this playback device ends the playback operation.

  On the other hand, if the determination result in step S110 is YES, that is, the internal memory 160 determines that the amount of stored data has reached the allowable storage amount and that it is impossible to take in more data, the process proceeds to step S113. The control unit 155 sends a reading stop signal to the second pickup 152, and the second pickup 152 stops the reproduction operation and stands by.

  In step S114, the control unit 155 synchronizes the address information obtained by reproducing the first recording area 3 and the address information obtained by reproducing the second recording area 6, as in step S112. Then, a memory control signal for outputting the accumulated data is supplied to the internal memory 160. Then, the process proceeds to step S115.

  In step S115, the control unit 155 determines based on the detection data from the detection unit 161 whether or not the amount of accumulated data has become equal to or less than a predetermined value. If this determination result is NO, that is, it is determined that a sufficient free area is not yet secured in the internal memory 160, the process returns to step S113.

  On the other hand, if the determination result in step S115 is YES, that is, if it is determined that the amount of stored data has reached a predetermined value and a sufficient free area is secured in the internal memory 160, the process proceeds to step S116, and the control unit In step 155, a control signal for restarting is sent to the second pickup 152 in the standby state, and the process returns to step S110.

  Note that the operations from step S109 to step S116 are continued until the performance is finished.

  Here, in the CD-R disc 1, the digital audio information recorded in the first recording area 3 is 2-channel digital audio information, and the digital audio information recorded in the second recording area 6 is the first. In the case of a multi-channel optical disc that is 2-channel digital audio information corresponding to the digital audio information recorded in one recording area 3, that is, the data of the front channel is stored in the first session 9 of the CD-R disc 1. When data is recorded in the CD-DA format and the rear channel data is compressed and recorded in the CD-ROM format in the second session 10, the management information data shown in FIG. There are two information frames with PO of “B0” and “E0”, and the second management area , The data PO of the management information shown in FIG. 5 there is "D1" in which information frame. These information frames serve as identification data for identifying the multi-channel optical disc.

  Therefore, in step S102 and step S104 of the flowchart showing the reproduction method of FIG. 21, the control unit 155 adds the information frame and data PO whose data PO is “B0” to the first management information from the first pickup 151. Information frame whose data PO is “D1” is detected in the second management information from the second pickup 152 in step S106. Then, the control unit 155 designates a signal processing method for reproducing the second recording area 6 of the optical disc corresponding to the multi-channel, for example, a signal processing method of performing an expansion process when reproducing the compressed data. The control signal is supplied to the second signal processing unit 154.

  Accordingly, the first signal processing unit 153 outputs 16-bit digital audio information of the front channel, and the second signal processing unit 154 outputs data of the rear channel. Thus, the digital audio information output terminal 165 outputs high-quality digital audio information of 4 channels.

  Next, the CD-R disc 1 records the higher order bits of the digital audio information in which the digital audio information recorded in the first recording area 3 is sampled with a predetermined sampling frequency and quantized with a predetermined number of bits. In the case of an optical disc corresponding to a so-called high-bit signal which is digital audio information and the digital audio information recorded in the second recording area 6 is digital audio information of lower bits of the quantized digital audio information, That is, for example, the upper 16-bit digital audio information is recorded in the CD-DA format in the first session 9 of the CD-R disc 1, and the lower 4-bit digital audio information is recorded in the second session 10, for example, the above-described ATRAC algorithm. Compressed and recorded in CD-ROM format That is, when 20-bit so-called high-bit digital audio information is recorded, two pieces of information in which the management information data PO shown in FIG. 5 is “B0” and “E0” in the first management area 2. There is a frame, and an information frame in which the management information data PO shown in FIG. 5 is “D2” exists in the second management area 5. These information frames become the identification data of the optical disc corresponding to the high bit signal.

  Therefore, in step S102 and step S104 of the flowchart showing the reproduction method of FIG. 21, the control unit 155 adds the information frame and data PO whose data PO is “B0” to the first management information from the first pickup 151. Information frame whose data PO is “D2” is detected in the second management information from the second pickup 152 in step S106. Then, the control unit 155 designates a signal processing method for reproducing the second recording area 6 of the optical disc corresponding to the high-bit signal, for example, a decompression process when reproducing the compressed data. To the second signal processing unit 154.

  Therefore, the first signal processing unit 153 outputs data recorded in the CD-DA format, and the second signal processing unit 154 outputs data obtained by decompressing the lower 4 bits of information. Thus, 20-bit high-quality digital audio information is output from the digital audio information output terminal 165.

  Further, the digital audio information recorded in the first recording area 3 of the CD-R disc 1 is sampled at a predetermined sampling frequency, for example, 88.2 kHz, and is quantized with a predetermined number of bits, for example, 20 bits. The divided digital audio information is band-divided at a predetermined frequency, for example, 22 kHz, which is 1/4 of the sampling frequency, and is grouped into a high frequency side and a low frequency side, for example, low frequency digital audio The digital audio information sampled at a sampling frequency lower than the sampling frequency of 88.2 kHz, for example 44.1 kHz, that is, down-sampled digital audio information recorded in the second recording area 6 is The so-called high sun that compresses the digital audio information on the high frequency side using, for example, the above-mentioned ATRAC algorithm In the case of an optical disc that is digital audio information corresponding to ring data, that is, for example, among the signals sampled at the sampling frequency of 88.2 kHz in the first session 9 of the CD-R disc 1, the low frequency side (0 kHz to 22 kHz) data is down-sampled and recorded in the CD-DA format, and the high-frequency data (22 kHz to 44 kHz) is compressed in the second session 10 and recorded in the CD-ROM format. There are two information frames in which the management information data PO shown in FIG. 5 is “BO” and “EO” in the first management area 2, and the management information shown in FIG. There is an information frame whose data PO is “D3”. These identification frames become the identification data of the optical disc corresponding to the multi-channel.

  Therefore, in step S102 and step S104 of the flowchart showing the reproduction method of FIG. 21, the control unit 155 adds the information frame and data PO whose data PO is “B0” to the first management information from the first pickup 151. Information frame whose data PO is “D3” is detected in the second management information from the second pickup 152 in step S106. Then, the control unit 155 designates a signal processing method for reproducing the second recording area 6 of the optical disc corresponding to the high bit rate, for example, a signal processing method for performing an expansion process when reproducing the compressed data. The control signal is supplied to the second signal processing unit 154.

  Therefore, the first signal processing unit 153 outputs data recorded in the CD-DA format, and the second signal processing unit 154 decompresses and outputs the compressed digital audio information. Thus, the digital audio information output terminal 165 samples at a sampling frequency of 88.1 kHz and outputs high-quality digital audio information of 20 bits.

  As an example of the recording medium of the present invention, a CD-R disc having a plurality of sessions on the same surface is taken as an example, and a recording apparatus for recording data on this CD-R disc, and this CD-R disc are reproduced. Although an example of a reproduction method and a reproduction apparatus has been described, the present invention is not limited to this. For example, a multimedia optical disk as a recording medium having a multilayer structure, for example, data in a CD-DA format on the first layer The present invention can be applied to a multimedia optical disk in which CD-ROM format data is recorded on the second layer, and a recording apparatus, a reproducing method, and a reproducing apparatus for the multimedia optical disk.

  As described above, according to the recording medium of the embodiment of the present invention, data can be recorded in different formats in the first session 9 and the second session 10, and the first By recording the digital audio information recorded in the CD-DA format in the session 9 and recording the digital audio information attached to the digital audio information recorded in the first session 9 in the second session 10, the audio data can be increased. It is possible to create a recording medium that records with the sound quality and is compatible with a conventional CD player.

  In addition, by using a recording medium that records four channels of digital audio information for each session, two channels for each session and at least the first session 9 in the CD-DA format, audio data can be recorded with high sound quality. In addition to recording, a recording medium that is compatible with a conventional CD player can be created.

  Also, in the recording medium, up to 16 bits of digital audio information of 16 bits or more are recorded in the first session 9 in the CD-DA format, and the digital audio information for the remaining bits is recorded in the second session 10 such as a CD. -By using a recording medium that records in the ROM format, it is possible to record audio data with high sound quality and to create a recording medium that is compatible with conventional CD players.

  In the recording medium, the digital audio information sampled at the sampling frequency defined in the normal CD-DA format is divided into a predetermined frequency, for example, a half of the sampling frequency, and this frequency is divided. The high frequency side and the low frequency side are grouped, the low frequency side is down-sampled and recorded in the first session 9 in the CD-DA format, and the high frequency side is recorded in the second session 10, for example. By using a recording medium recorded in the CD-ROM format, it is possible to record audio data with high sound quality and to create a recording medium that is compatible with a conventional CD player.

  Further, according to the recording apparatus of the embodiment of the present invention, data can be recorded in different formats in the first session 9 and the second session 10, and the CD is recorded in the first session 9. -By recording the digital audio information recorded in the DA format into the second session 10 and recording the digital audio information attached to the digital audio information recorded in the first session 9, the audio data can be kept in high sound quality. In addition to recording, a recording medium that is compatible with a conventional CD player can be created.

  Also, according to the reproduction method of the embodiment of the present invention, digital audio information is recorded in the first recording area 3 and digital audio information recorded in the first recording area 3 is recorded in the second recording area 6. Reproduction of the recording medium on which the corresponding digital audio information is recorded is performed by reading and reproducing the corresponding digital audio information recorded in the first and second recording areas 6 and outputting them in synchronization with each other. Digital audio information can be reproduced without degrading sound quality from a recording medium recorded with sound quality.

  Further, in the reproducing method, 2-channel digital audio information is recorded in the first recording area 3, and 2 corresponding to the digital audio information recorded in the first recording area 3 is recorded in the second recording area 6. When a recording medium on which channel digital audio information is recorded is used, the digital audio information recorded in the first recording area 3 and the digital audio information recorded in the second recording area 6 are respectively Multi-channel high-quality digital audio information can be reproduced by reading and reproducing and outputting in synchronization.

  In the reproducing method, recording of up to 16 bits of digital audio information of 16 bits or more is recorded in the first recording area 3, and digital audio information of the remaining bits is recorded in the second recording area 6. When a medium is used, the digital audio information recorded in the first recording area 3 and the digital audio information recorded in the second recording area 6 are read and reproduced, and reproduced in synchronization. It is possible to reproduce high-quality digital audio information with a high bit.

  In the reproducing method, the first recording area 3 has digital audio information sampled at a sampling frequency defined in a normal CD-DA format at a predetermined frequency, for example, a half of the sampling frequency. The information is recorded by down-sampling information at a frequency lower than the half of the sampling frequency and recording the information compressed at the higher frequency in the second recording area 6. Is used, the digital audio information from the first recording area 3 is reproduced, the compressed information from the second recording area 6 is decompressed and reproduced, and the corresponding digital audio information is synchronized with each other. By outputting, it becomes possible to reproduce high-sampling high-quality digital audio information.

  Further, according to the playback apparatus of the embodiment of the present invention, digital audio information is recorded in the first recording area 3 and digital audio information recorded in the first recording area 3 is recorded in the second recording area 6. The reproduction of the recording medium on which the corresponding digital audio information is recorded is read and reproduced by using a single reproduction means, and the digital audio information recorded in the first and second recording areas 6 is reproduced. By outputting the digital audio information in synchronization, it is possible to reproduce the digital audio information without degrading the sound quality from the recording medium recorded with the high sound quality.

  Further, in the playback apparatus, 2-channel digital audio information is recorded in the first recording area 3, and 2 corresponding to the digital audio information recorded in the first recording area 3 is recorded in the second recording area 6. When a recording medium on which channel digital audio information is recorded is used, the digital audio information recorded in the first recording area 3 and the digital audio information recorded in the second recording area 6 are reproduced. It is possible to reproduce multi-channel high-quality digital audio information by reading and reproducing by means and controlling the control means to output digital audio information corresponding to each other in synchronization.

  In the playback apparatus, the first recording area 3 records up to 16 bits of digital audio information of 16 bits or more, and the second recording area 6 records the remaining bits of digital audio information. When the medium is used, the digital audio information recorded in the first recording area 3 and the digital audio information recorded in the second recording area 6 are read and reproduced by the reproducing means, and the control means is used. By controlling the digital audio information corresponding to each other so as to be output in synchronization, it is possible to reproduce high-quality digital audio information with high bits.

  In the playback apparatus, the first recording area 3 has digital audio information sampled at a sampling frequency defined in a normal CD-DA format at a predetermined frequency, for example, a half of the sampling frequency. The information is recorded by down-sampling information at a frequency lower than the half of the sampling frequency and recording the information compressed at the higher frequency in the second recording area 6. Is used, the reproduction means reads and reproduces the digital audio information recorded in the first recording area 3, and reads and decompresses the compressed digital audio information from the second recording area 6. High-sampling high-quality digital audio by playing and controlling the control means to output digital audio information corresponding to each other in synchronization. Reproduction of the information becomes available.

  Further, according to the playback apparatus of the embodiment of the present invention, digital audio information is recorded in the first recording area 3 and digital audio information recorded in the first recording area 3 is recorded in the second recording area 6. The reproduction of the recording medium on which the corresponding digital audio information is recorded is obtained by using the two reproducing means to extract the digital audio information recorded in the first and second recording areas 6 and corresponding to each other by the mixing means. By synchronizing and outputting the digital audio information, it is possible to reproduce the digital audio information without deteriorating the sound quality from the recording medium recorded with the high sound quality.

  Further, in the playback apparatus, 2-channel digital audio information is recorded in the first recording area 3, and 2 corresponding to the digital audio information recorded in the first recording area 3 is recorded in the second recording area 6. When a recording medium on which digital audio information of a channel is recorded is used, the first reproducing means reads and reproduces the digital audio information recorded in the first recording area 3, and the second reproducing means The digital audio information recorded in the second recording area 6 is read and reproduced, and the digital audio information corresponding to each other from the first and second reproduction means is synchronized and output by the mixing means, Multi-channel high-quality digital audio information can be played back.

  In the playback apparatus, the first recording area 3 records up to 16 bits of digital audio information of 16 bits or more, and the second recording area 6 records the remaining bits of digital audio information. When a medium is used, digital audio information recorded in the first recording area 3 is read and reproduced by the first reproducing means, and recorded in the second recording area 6 by the second reproducing means. The digital audio information is read and reproduced, and the digital audio information corresponding to each other from the first and second reproduction means is synchronized and output by the mixing means, so that the high-quality digital audio information of high bit quality can be obtained. Playback is possible.

  In the playback apparatus, the first recording area 3 has digital audio information sampled at a sampling frequency defined in a normal CD-DA format at a predetermined frequency, for example, a half of the sampling frequency. The information is recorded by down-sampling information at a frequency lower than the half of the sampling frequency and recording the information compressed at the higher frequency in the second recording area 6. Is used, digital audio information recorded in the first recording area 3 is read and reproduced by the first reproduction means, and digital compressed from the second recording area 6 is reproduced by the second reproduction means. The audio information is read, decompressed and reproduced, and the digital audio information corresponding to each other from the first and second reproduction means is synchronized and output by the mixing means, thereby enabling high sampling. Playback of sound quality of digital audio information becomes available.

  It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

It is a figure which shows the structure of the recording medium to which this invention is applied. It is a figure explaining the CIRC frame which is a data format of a recording medium. It is a figure explaining the sub-coding based on a CIRC frame. It is a figure which shows the data format of the Q channel of a subcoding. It is a figure which shows the data format of Q channel recorded on the management area | region of a recording medium. 1 is a block diagram showing a configuration of a first embodiment of a recording apparatus to which the present invention is applied. It is a block diagram which shows the structure of the audio | voice processing part of the said recording device. It is a block diagram which shows the structure of the 2nd Example of the recording device to which this invention is applied. It is a block diagram which shows the structure of the 1st modification of the said recording device. It is a block diagram which shows the structure of the 2nd modification of the said recording device. It is a block diagram which shows the structure of the 3rd modification of the said recording device. It is a block diagram which shows the structure of the 3rd Example of the recording device to which this invention is applied. It is a block diagram which shows the structure of the 1st Example of the reproducing | regenerating apparatus to which this invention is applied. It is a flowchart for demonstrating the reproducing | regenerating method to which this invention is applied. It is a figure for demonstrating operation | movement of the memory of the said reproducing | regenerating apparatus. It is a number line which shows the timing of the data writing with respect to two memories, and a data reading. It is a block diagram which shows the structure of the 1st Example of the reproducing | regenerating apparatus to which this invention is applied. It is a block diagram which shows the structure of the 1st modification of the said reproducing | regenerating apparatus. It is a block diagram which shows the structure of the 2nd modification of the said reproducing | regenerating apparatus. It is a block diagram which shows the structure of the 2nd Example of the reproducing | regenerating apparatus to which this invention is applied. It is a flowchart for demonstrating the reproducing | regenerating method to which this invention is applied.

Explanation of symbols

  1 CD-R disc, 2 first management area, 3 first recording area, 4 first lead-out area, 5 second management area, 6 second recording area, 7 second lead-out area, 9 First session, 10 Second session, 16 First audio processing unit, 17 Second audio processing unit, 18 Recording unit, 23 Audio processing unit, 24 Quantization unit, 25 Separation unit, 31 Noise shaping unit 32 dither circuit unit 35 differential calculation unit 36 55 music CD format conversion unit 38 56 CD-ROM format conversion unit 39 54 mixing unit 44 51 control unit 45 EFM modulation unit 46 laser diode 52 Time code output unit 61 Band separation unit 62 Frequency characteristic changing unit 63 Compression processing unit 70 Optical pick 71, signal processing unit, 72 first memory, 73 second memory, 74 first determination unit, 75 second determination unit, 76 control unit, 132 CD signal processing and time axis synchronization circuit, 133 CD ROM signal processing circuit, 135 memory control circuit, 136 compression decoding processing circuit, 140 oversampling circuit, 141 band synthesis unit, 142 data synthesis unit, 152 first pickup, 154 second pickup, 155 control unit, 160 inside Memory, 162 mixing unit, 164 D / A conversion unit

Claims (9)

A first recording area in which 2-channel digital audio information is recorded; a first management area in which information for managing digital audio information recorded in the first recording area is recorded; There are a second recording area in which 2-channel digital audio information corresponding to the digital audio information recorded in the recording area is recorded, and information for managing the digital audio information recorded in the second recording area. A playback device for playing back digital audio information from a recording medium having a recorded second management area,
Reproducing means for reproducing digital audio information from the recording medium;
First storage means for storing digital audio information read from the first recording area by the reproducing means;
Second storage means for storing digital audio information read from the second recording area by the reproducing means;
First discriminating means for discriminating whether or not the amount of data stored in the first storage means is greater than or equal to a predetermined amount;
Second discriminating means for discriminating whether or not the amount of data stored in the second storage means is greater than or equal to a predetermined amount;
Moving means for moving the reproducing means;
Based on the information in the first management area, the reproducing means is moved to the second recording area, the digital audio information read from the second recording area is stored in the second storage means, and When the second determination means determines that the amount of data stored in the second storage means is greater than or equal to a predetermined amount, digital audio information corresponding to the digital audio information stored in the second storage means is recorded. The reproduction means is moved to the first recording area, and the digital audio information read from the first recording area is stored in the first storage means, and the first and second storage means are stored. Control means for performing control to output digital audio information in synchronization;
A playback apparatus comprising: The digital audio information in the second recording area is compressed digital audio information.
The playback apparatus according to claim 1. The digital audio information recorded in the second recording area has a time code corresponding to the digital audio information recorded in the first recording area.
The playback apparatus according to claim 1. A first recording area in which digital audio information of higher bits of digital audio information sampled at a predetermined sampling frequency and quantized with a predetermined number of bits is recorded, and the digital recorded in the first recording area A first management area in which information for managing audio information is recorded, a second recording area in which digital audio information of lower bits of the quantized digital audio information is recorded, and the second recording A playback device for playing back digital audio information from a recording medium having a second management area in which information for managing digital audio information recorded in the area is recorded,
Reproducing means for reproducing digital audio information from the recording medium;
First storage means for storing digital audio information read from the first recording area by the reproducing means;
Second storage means for storing digital audio information read from the second recording area by the reproducing means;
First discriminating means for discriminating whether or not the amount of data stored in the first storage means is greater than or equal to a predetermined amount;
Second discriminating means for discriminating whether or not the amount of data stored in the second storage means is greater than or equal to a predetermined amount;
Moving means for moving the reproducing means;
Based on the information in the first management area, the reproducing means is moved to the second recording area, the digital audio information read from the second recording area is stored in the second storage means, and When the second determination means determines that the amount of data stored in the second storage means is greater than or equal to a predetermined amount, digital audio information corresponding to the digital audio information stored in the second storage means is recorded. The reproduction means is moved to the first recording area, and the digital audio information read from the first recording area is stored in the first storage means, and the first and second storage means are stored. Control means for performing control to output digital audio information in synchronization;
Reproducing apparatus comprising: a. Digital audio information sampled at a predetermined sampling frequency and quantized with a predetermined number of bits is band-divided at a predetermined frequency and grouped into a high frequency side and a low frequency side. A first recording area in which digital audio information sampled at a sampling frequency lower than the predetermined sampling frequency is recorded, and information for managing the digital audio information recorded in the first recording area is recorded. A first recording area, a second recording area in which digital audio information obtained by compressing the digital audio information of the other group divided into the high frequency side and the low frequency side is recorded, and the second recording area Digital audio information from a recording medium having a second management area in which information for managing the digital audio information recorded in the recording area is recorded A reproducing apparatus for reproducing,
Reproducing means for reproducing digital audio information from the recording medium;
First storage means for storing digital audio information read from the first recording area by the reproducing means;
Second storage means for storing digital audio information read from the second recording area by the reproducing means;
First discriminating means for discriminating whether or not the amount of data stored in the first storage means is greater than or equal to a predetermined amount;
Second discriminating means for discriminating whether or not the amount of data stored in the second storage means is greater than or equal to a predetermined amount;
Moving means for moving the reproducing means;
Based on the information in the first management area, the reproducing means is moved to the second recording area, the digital audio information read from the second recording area is stored in the second storage means, and When the second determination means determines that the amount of data stored in the second storage means is greater than or equal to a predetermined amount, digital audio information corresponding to the digital audio information stored in the second storage means is recorded. The reproduction means is moved to the first recording area, and the digital audio information read from the first recording area is stored in the first storage means, and the first and second storage means are stored. Control means for performing control to output digital audio information in synchronization;
Reproducing apparatus comprising: a. A first recording area in which 2-channel digital audio information and address information are multiplexed and recorded, and a first area in which information for managing the digital audio information recorded in the first recording area is recorded A management area, a second recording area in which two-channel digital audio information corresponding to the digital audio information recorded in the first recording area and address information are multiplexed and recorded, and the second recording area A playback device for playing back digital audio information from a recording medium having a second management area in which information for managing the digital audio information recorded in
First reproducing means for reading digital audio information and address information from the first recording area;
Second reproducing means for reading digital audio information and address information from the second recording area;
Storage means for storing digital audio information from the second reproduction means;
Control means for controlling the storage means and the second reproduction means based on the address information from the first recording area and the address information from the second recording area;
Mixing means for synchronizing and mixing the digital audio information reproduced by the first reproducing means and the digital audio information reproduced by the second reproducing means;
Output means for outputting digital audio information mixed by the mixing means;
A playback apparatus comprising: The digital audio information in the second recording area is compressed digital audio information.
The reproducing apparatus according to claim 6 . A first recording area in which digital audio information of higher bits of digital audio information sampled at a predetermined sampling frequency and quantized with a predetermined number of bits and address information are multiplexed and recorded; A first management area in which information for managing digital audio information recorded in the recording area is recorded, and digital audio information and address information of lower bits of the quantized digital audio information are multiplexed and recorded. For reproducing digital audio information from a recording medium having a recorded second recording area and a second management area in which information for managing the digital audio information recorded in the second recording area is recorded A device,
First reproducing means for reading digital audio information and address information from the first recording area;
Second reproducing means for reading digital audio information and address information from the second recording area;
Storage means for storing digital audio information from the second reproduction means;
Control means for controlling the storage means and the second reproduction means based on the address information from the first recording area and the address information from the second recording area;
Mixing means for synchronizing and mixing the digital audio information reproduced by the first reproducing means and the digital audio information reproduced by the second reproducing means;
Output means for outputting digital audio information mixed by the mixing means;
Reproducing apparatus comprising: a. Digital audio information sampled at a predetermined sampling frequency and quantized with a predetermined number of bits is band-divided at a predetermined frequency and grouped into a high frequency side and a low frequency side. A first recording area in which digital audio information sampled at a sampling frequency lower than the predetermined sampling frequency and address information are multiplexed and recorded; and digital audio information recorded in the first recording area. The first management area in which information for management is recorded and the digital audio information and address information obtained by compressing the digital audio information of the other group divided into the high frequency side and the low frequency side are multiplexed. A second recorded area in which information for managing the recorded second recording area and digital audio information recorded in the second recorded area is recorded From a recording medium having a management area and a reproducing apparatus for reproducing digital audio information,
First reproducing means for reading digital audio information and address information from the first recording area;
Second reproducing means for reading digital audio information and address information from the second recording area;
Storage means for storing digital audio information from the second reproduction means;
Control means for controlling the storage means and the second reproduction means based on the address information from the first recording area and the address information from the second recording area;
Mixing means for synchronizing and mixing the digital audio information reproduced by the first reproducing means and the digital audio information reproduced by the second reproducing means;
Output means for outputting digital audio information mixed by the mixing means;
Reproducing apparatus comprising: a.

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