JP3931917B2 - Playback apparatus and playback method - Google Patents

Description

  The present invention relates to a recording or reproducing apparatus and a recording or reproducing method capable of recording / reproducing data such as music on a disk-shaped recording medium, for example.

  A data-rewritable magneto-optical disk on which a user can record music data or the like is known, and in such a disk medium, a buffer RAM is particularly used to improve the earthquake resistance function.

That is, at the time of reproduction, the audio data read from the magneto-optical disk is intermittently written into the buffer RAM at a high rate, while being continuously read out from the buffer RAM at a low rate and demodulated as an audio reproduction signal. Go. At this time, a certain amount of data is always stored in the buffer RAM. Therefore, even if a track jump occurs due to external vibration or the like, and data reading from the magneto-optical disk is temporarily interrupted, the buffer RAM Can continuously read out the audio data, and the reproduced audio is output without interruption.
Further, at the time of recording, the input data is once written continuously into the buffer RAM at a low rate, and this is intermittently read out at a high rate and supplied to the recording head for recording on the disk.

Incidentally, as shown in FIG. 11, the recording track on the magneto-optical disk is formed by continuously forming a cluster CL (= 36 sectors-) consisting of a sub-data area of 4 sectors (1 sector = 2352 bytes) and a main data area of 32 sectors. One cluster is the minimum unit for recording. One cluster corresponds to two to three rounds of tracks. The address is recorded for each sector.
The 4-sector sub-data area is used as sub-data or a linking area, and TOC data, audio data, etc. are recorded in the 32-sector main data area.

  The sectors are further subdivided into sound groups, and two sectors are divided into 11 sound groups. In the 424-byte sound group, data is recorded separately for the L channel and the R channel. One sound group has an audio data amount corresponding to a time of 11.6 msec. In addition, 212 bytes, which are the data area of the L channel or the R channel, are called a sound frame.

  When data recorded / reproduced on the disk in such a format is recorded / reproduced via the buffer RAM, the buffer RAM stores data in units of sectors. That is, the sector address and the byte address (0 to 2351 bytes) in the sector are combined to generate an access address, and writing and reading are executed.

  By the way, in a magneto-optical disk system (for example, a mini disk system) employing such a system, when reading data from the buffer RAM, a system controller that controls the entire system obtains various information about the read sector. This is convenient for system operation processing. For example, by playing through the buffer RAM, the performance progress information in a certain sector will be different from the time when it is read from the disk and when it is actually played back and output. The time information is preferably readable at the time it is read from the data buffer RAM for that sector.

  In addition, track number information (track number), track change information, track mode information such as stereo / monaural, emphasis, copyright, etc., link information before and after audio data management information, error information, etc. It is very convenient if the data of the sector can be written simultaneously when the sector data is written to the buffer RAM and the data of the sector can be read when the data is read from the buffer RAM (hereinafter, stored corresponding to these sectors). Various information is called additional data).

  For this reason, conventionally, when data of a certain sector is written into the buffer RAM, the above-mentioned various additional data are overwritten on data portions that are no longer necessary (for example, data portions such as sync data and subheaders), and the buffer RAM It was to be held corresponding to the sector within.

  However, when reading the additional data, of course, it is necessary to specify an address for that purpose. For this reason, the system controller performs management of the address where the additional data is written and extra read addressing calculation processing. There is a problem that the processing load is increasing.

  The present invention has been made in view of such a problem. Additional data is stored corresponding to sector data in the buffer RAM, and the system controller addresses the additional data for access. The purpose is to reduce the processing burden by making it possible to eliminate the necessity.

Thus, playback and playback data, a header and a first additional data relating to the sync data and the reproduced data, and sub-data, the playback data from a recording medium in which sector data is recorded in sectors comprising A reproducing means for reproducing the sector unit header, the sub data, and the reproduction data from the recording medium, and second additional data used for various operation management associated with the sector unit reproduction data. Additional data generating means for generating, memory means for storing data, control means for controlling reproduction of the reproduction data, the first additional data, the sub data, the reproduction data, the sync data, and the second data and additional data successively in sectors in a single sector is stored in said memory means, it has been stored in said memory means A serial first additional data and the reproduced data and the second additional data and a memory control means for creating read out from said memory means.

The reproduction data is reproduced from a recording medium on which sector data including reproduction data , sync data, first additional data related to the reproduction data, and sub data is recorded in units of sectors. in the reproducing method, the from the recording medium to control the reproduction of the above header sector units and the sub-data and the reproduced data, a second additional data the reproduction to be used for various operations management associated with the reproduced reproduction data The first additional data, the sub data, the reproduction data, the sync data, and the second additional data are sequentially generated in a single sector by using the memory control means in correspondence with the data sector. in is stored in the memory means, said memory control means with said first additional data and the having stored in said memory means The raw data and the second additional data to read from said memory means, for controlling the reproduction of the reproduction data read out from said memory means.

As described above, according to the present invention, in the memory means (buffer RAM), the area is set so that the additional data can be stored in correspondence with the sector data. According to the sector count value at that time, the address in the additional area for additional data can be calculated, and by executing this with the memory control means, the processing load on the system controller can be remarkably reduced.

  Hereinafter, embodiments of the recording or reproducing apparatus and the recording or reproducing method of the present invention will be described with reference to FIGS. In this embodiment, a recording / reproducing apparatus using a magneto-optical disk as a recording medium and a memory control apparatus provided in the recording / reproducing apparatus are used.

FIG. 1 shows a block diagram of a main part of the recording / reproducing apparatus.
In FIG. 1, reference numeral 1 denotes a magneto-optical disk on which audio data is recorded, for example, and is rotated by a spindle motor 2. An optical head 3 irradiates a laser beam to the magneto-optical disk 1 at the time of recording / reproducing, and at the time of recording provides a high level laser output for heating the recording track to the Curie temperature, and at the time of reproduction by the magnetic Kerr effect. A relatively low level laser output for detecting data from the reflected light.

  For this reason, the optical head 3 is equipped with a laser diode as a laser output means, an optical system including a deflection beam splitter, an objective lens, and the like, and a detector for detecting reflected light. The objective lens 3a is held by a biaxial mechanism 4 so as to be displaceable in the radial direction of the disc and in the direction in which the objective lens 3a is in contact with or separated from the disc.

  Reference numeral 6 denotes a magnetic head for applying a magnetic field modulated by the supplied data to the magneto-optical disk, which is disposed at a position facing the optical head 3 with the magneto-optical disk 1 interposed therebetween. The entire optical head 3 and the magnetic head 6 can be moved in the disk radial direction by a thread mechanism 5.

  Information detected from the magneto-optical disk 1 by the optical head 3 by the reproducing operation is supplied to the RF amplifier 7. The RF amplifier 7 performs processing of the supplied information to reproduce RF signal, tracking error signal, focus error signal, absolute position information (absolute position information recorded as a pregroove (wobbling groove) on the magneto-optical disk 1), Address information, focus monitor signal, etc. are extracted. The extracted reproduction RF signal is supplied to the encoder / decoder unit 8. The tracking error signal and the focus error signal are supplied to the servo circuit 9, and the address information is supplied to the address decoder 10. Further, the absolute position information and the focus monitor signal are supplied to a system controller 11 constituted by, for example, a microcomputer.

  The servo circuit 9 generates various servo drive signals based on the supplied tracking error signal, focus error signal, track jump command, seek command from the system controller 11, information on the rotational speed detection of the spindle motor 2, and the like. And the thread mechanism 5 is controlled to perform focus and tracking control, and the spindle motor 2 is controlled to a constant angular velocity (CAV) or a constant linear velocity (CLV).

  The reproduction RF signal is subjected to decoding processing such as EFM demodulation and CIRC by the encoder / decoder unit 8, and then temporarily written in the buffer RAM 13 by the memory controller 12. The reading of data from the magneto-optical disk 1 by the optical head 3 and the transfer of reproduction data in the system from the optical head 3 to the buffer RAM 13 are performed at 1.41 Mbit / sec and intermittently.

  The data written in the buffer RAM 13 is read out at the timing when the reproduction data is transferred at 0.3 Mbit / sec and supplied to the encoder / decoder unit 14. Then, a reproduction signal process such as a decoding process for the audio compression process is performed, and an analog signal is made by the D / A converter 15, supplied from a terminal 16 to a predetermined amplifier circuit unit, and reproduced and output. For example, it is output as L and R audio signals.

  Here, writing / reading of data to / from the buffer RAM 13 is performed by the memory controller 12 being addressed under the control of the write pointer and the read pointer, but the write pointer (write address) is 1.41 as described above. On the other hand, the read pointer (read address) is incremented at the timing of 0.3 Mbit / sec while being incremented at the timing of Mbit / sec. The data is accumulated to some extent. When the full capacity data is accumulated in the buffer RAM 13, the increment of the write pointer is stopped, and the data read operation from the magneto-optical disk 1 by the optical head 3 is also stopped. However, since the increment of the read pointer R is continuously executed, the reproduced audio output is not interrupted.

  Thereafter, only the reading operation from the buffer RAM 13 is continued, and if the amount of data stored in the buffer RAM 13 becomes a predetermined amount or less at a certain time, the data reading operation by the optical head 3 and the increment of the write pointer W are again performed. The data is stored again in the buffer RAM 13 again.

  By outputting the playback sound signal via the buffer RAM 13 in this way, for example, even when tracking is lost due to a disturbance or the like, the playback sound output is not interrupted. By accessing the correct tracking position and restarting data reading, the operation can be continued without affecting the reproduction output. That is, the earthquake resistance function can be remarkably improved.

In FIG. 1, the address information output from the address decoder 10 and the subcode data used for the control operation are supplied to the system controller 11 via the encoder / decoder unit 8 and used for various control operations.
Further, a lock detection signal of a PLL circuit that generates a bit clock for recording / reproducing operation, and a monitor signal of a frame synchronization signal missing state of reproduced data (L and R channels) are also supplied to the system controller 11.

In addition, the system controller 11 outputs a laser control signal _SLP for controlling the operation of the laser diode in the optical head 3, and controls on / off of the output of the laser diode. It is possible to switch between an output during reproduction, which is a low level, and an output during recording, which is a relatively high level.

  When a recording operation is performed on the magneto-optical disk 1, the recording signal (analog audio signal) supplied to the terminal 17 is converted into digital data by the A / D converter 18, and then the encoder / decoder unit. 14 is subjected to audio compression encoding processing. The recording data compressed by the encoder / decoder unit 14 is once written in the buffer RAM 13 by the memory controller 12, read at a predetermined timing, and sent to the encoder / decoder unit 8. The encoder / decoder unit 8 performs an encoding process such as CIRC encoding and EFM modulation, and then supplies the encoded signal to the magnetic head driving circuit 15.

  The magnetic head drive circuit 15 supplies a magnetic head drive signal to the magnetic head 6 in accordance with the encoded recording data. That is, an N or S magnetic field is applied to the magneto-optical disk 1 by the magnetic head 6. At this time, the system controller 11 supplies a control signal to the optical head so as to output a recording level laser beam.

  Reference numeral 19 denotes an operation input unit provided with keys used for user operations, and 20 denotes a display unit constituted by, for example, a liquid crystal display. The operation input unit 19 is provided with a recording key, a reproduction key, a stop key, an AMS key, a search key and the like for user operations.

  Further, when performing recording / reproducing operation on the disk 1, management information recorded on the disk 1, that is, P-TOC (pre-mastered TOC), U-TOC (user TOC) is read, and the system controller is read out. 11 determines the address of the segment to be recorded on the disk 1 and the address of the segment to be reproduced according to the management information. This management information is held in the buffer RAM 13. Therefore, the buffer RAM 13 is divided into the recording data / reproduction data buffer area and the area for holding the management information.

  Then, the system controller 11 reads out the management information by executing the reproducing operation on the innermost circumference side of the disc on which the management information is recorded when the disc 1 is loaded, and stores it in the buffer RAM 13. Thereafter, it can be referred to when recording / reproducing the disc 1.

  The U-TOC is edited and rewritten according to data recording or erasing, but the system controller 11 changes this editing processing to U-TOC information stored in the buffer RAM 13 every time recording / erasing is performed. The U-TOC area of the disk 1 is also rewritten at a predetermined timing according to the rewriting operation.

  Here, the audio data sector recorded in the sector data format on the disc 1, the P-TOC sector for managing the recording / reproducing operation of the audio data, and the U-TOC sector will be described.

  As the P-TOC information, area designation such as a recordable area (recordable user area) of the disc, management of the U-TOC area, and the like are performed. When the disc 1 is a pre-mastered disc that is a reproduction-only optical disc, it is possible to manage music recorded in ROM by the P-TOC.

The format of P-TOC is shown in FIG.
FIG. 2 shows one sector (sector 0) of P-TOC information repeatedly recorded in an area used for P-TOC (for example, the ROM area on the innermost side of the disk). The P-TOC format is prepared from sector 0 to sector 4, but sector 1 and later are optional.

  The data area of the sector of P-TOC (4 bytes x 588 2352 bytes) has a synchronization pattern consisting of 1 byte data of all 0 or all 1 at the head position, and 4 bytes of addresses indicating the cluster address and sector address are added. Thus, the header is used to indicate the P-TOC area.

Further, an identification ID by an ASCII code corresponding to the characters “MINI” is added to a predetermined address position following the header.
Next, the disc type and recording level, the first track number (First TNO) recorded, the last track number (Last TNO), the lead-out start address RO _A , and the power cal area start address PC _A , U-TOC start address UST _a of (data area of U-TOC sector 0 in FIG. 3 to be described later), a start address RST _a, etc. recordable area is recorded.

  Subsequently, a correspondence table instruction data portion having table pointers (P-TNO1 to P-TNO255) for associating each recorded music and the like with a parts table in a management table portion described later is prepared.

  In the area following the correspondence table instruction data portion, 255 part tables from (01h) to (FFh) are provided corresponding to the table pointers (P-TNO1 to P-TNO255) in the correspondence table indication data portion. (The numerical value with “h” in this specification is a so-called hexadecimal notation). Each part table is capable of recording a start address for a certain segment, an end address for the end, and mode information (track mode) of the segment (track).

  The track mode information in each part table includes information indicating whether the segment is set to prohibit overwriting or data copying, whether it is audio information, the type of monaural / stereo, and the like. .

  Each part table from (01h) to (FFh) in the management table part is indicated by the contents of the segment by the table pointer (P-TNO1 to P-TNO255) in the corresponding table instruction data part. In other words, the first music piece has a part table (for example, (01h) as the table pointer P-TNO1. However, the table pointer is actually a byte position in the P-TOC sector 0 by a predetermined calculation process. In this case, the start address of the parts table (01h) is the start address of the recording position of the first song, and the end address is the same as the end address. This is the end address of the position where the first song is recorded. Further, the track mode information is information about the first music piece.

Similarly, for the second song, the start address, end address, and track mode information of the recording position of the second song are recorded in the parts table (for example, (02h)) indicated by the table pointer P-TNO2.
Similarly, since the table pointers are prepared up to P-TNO255, it is possible to manage up to the 255th music piece on the P-TOC.
Then, by forming the P-TOC sector 0 in this way, it is possible to access and reproduce a predetermined musical piece at the time of reproduction, for example.

In the case of a recordable / reproducible magneto-optical disk, since there is no so-called pre-mastered music area, the above-described correspondence table instruction data part and management table part are not used (these are managed by the U-TOC described later). Therefore, all the bytes are set to “00h”.
However, for a hybrid type disc having both a ROM area and a magneto-optical area as an area for recording music and the like, the correspondence table instruction data section and the management table section are used for managing the music in the ROM area. .

Next, U-TOC will be described.
FIG. 3 shows the format of one sector of the U-TOC, and data in which management information is recorded mainly on a song recorded by a user and an unrecorded area (free area) in which a new song can be recorded. It is considered as an area. The U-TOC also has formats from sector 0 to sector 4, but sector 1 and later are optional.
For example, when recording a certain piece of music on the disc 1, the system controller 11 can search the free area on the disc from the U-TOC and record the audio data here. ing. Further, at the time of reproduction, the area where the music to be reproduced is recorded is determined from the U-TOC, and the area is accessed to perform the reproduction operation.

  In the U-TOC sector (sector 0) shown in FIG. 3, a header is first provided in the same manner as in the P-TOC, followed by a manufacturer code, a model code, and the first song number (First TNO) at a predetermined address position. ), The last song number (Last TNO), sector usage, disc serial number, disc ID, etc. are recorded, and the recorded and recorded song areas are recorded by the user. Are recorded as correspondence table instruction data parts, so that various table pointers (P-DFA, P-EMPTY, P-FRA, P-TNO1 to P-TNO255) are recorded. An area is prepared.

  Then, 255 part tables (01h) to (FFh) are provided as management table parts to be associated with the table pointers (P-DFA to P-TNO255) of the correspondence table instruction data part. In the same manner as the P-TOC sector 0 in FIG. 2, the start address for the certain segment, the end address for the end, and the mode information (track mode) of the segment are recorded. In the case of TOC sector 0, since the segment indicated in each part table may be connected to another segment in some cases, link information indicating the part table in which the start address and end address of the connected segment are recorded. Can be recorded.

  In this type of recording / playback apparatus, for example, data of one piece of music is recorded physically discontinuously, that is, over a plurality of segments (here, a segment refers to a track portion on which physically continuous data is recorded). Even if it has been recorded, there is no hindrance to the playback operation by playing while accessing between segments. Therefore, for the purpose of efficient use of the recordable area, etc., the music recorded by the user is recorded in multiple segments. There is also a case. For this reason, link information is provided, for example, the numbers (01h) to (FFh) given to each part table (actually indicated by a numerical value that is a byte position in the U-TOC sector 0 by a predetermined arithmetic process) By specifying the parts table to be linked, the parts table can be linked. (Note that since the music or the like recorded in advance is not usually segmented, the link information in the P-TOC sector 0 is all “(00h)” as shown in FIG. 2).

  That is, in the management table section in the U-TOC sector 0, one part table represents one segment. For example, for a music composed of three segments connected, three parts connected by link information. The segment position is managed by the table.

  Each part table from (01h) to (FFh) in the management table part of U-TOC sector 0 is the table pointer (P-DFA, P-EMPTY, P-FRA, P-TNO1-P in the corresponding table instruction data part) -TNO255) shows the contents of the segment as follows:

  The table pointer P-DFA indicates a defective area on the magneto-optical disk 1 and is the head of one part table or a plurality of part tables indicating a track portion (= segment) that becomes a defective area due to a scratch or the like. The parts table is specified. In other words, if a defective segment exists, one of (01h) to (FFh) is recorded in the table pointer P-DFA, and the defective segment is indicated by the start and end addresses in the corresponding parts table. . When there are other defective segments, other part tables are designated as link information in the parts table, and the defective segments are also indicated in the parts table. If there is no other defective segment, the link information is, for example, “(00h)”, and there is no link thereafter.

  The table pointer P-EMPTY indicates the first part table of one or more unused part tables in the management table section. If there is an unused part table, the table pointer P-EMPTY is (01h ) ~ (FFh) is recorded. If there are multiple unused part tables, the part tables are specified sequentially by link information from the part table specified by the table pointer P-EMPTY, and all unused part tables are linked on the management table section. Is done.

  For example, if the audio data such as music is not recorded at all and there is no defect, the parts table is not used at all, so the parts table (01h) is specified by the table pointer P-EMPTY, for example, Also, the parts table (02h) is specified as the link information for the parts table (01h), the parts table (03) is specified as the link information for the parts table (02h), and so on. . In this case, the link information of the parts table (FFh) is “(00h)” indicating no connection thereafter.

  The table pointer P-FRA indicates a free area (including an erase area) in which data can be written on the magneto-optical disk 1, and one or a plurality of parts indicating a track portion (= segment) as a free area. The first part table in the table is specified. In other words, if there is a free area, one of (01h) to (FFh) is recorded in the table pointer P-FRA, and the corresponding part table indicates the segment that is the free area by the start and end addresses. Has been. Further, when there are a plurality of such segments, that is, there are a plurality of parts tables, the link information sequentially designates the parts tables whose link information is “(00h)”.

  FIG. 4 schematically shows a management state of a segment that becomes a free area by a parts table. This is because when the segment (03h) (18h) (1Fh) (2Bh) (E3h) is set as a free area, this state continues to the corresponding table instruction data P-FRA and the parts table (03h) (18h) (1Fh) The state represented by the link (2Bh) (E3h) is shown. The above-described defect area and unused part table management form are also the same.

  Table pointers P-TNO1 to P-TNO255 indicate the music recorded by the user on the magneto-optical disk 1. For example, in the table pointer P-TNO1, one or more segments in which data of the first music is recorded. The parts table that shows the first segment in time is specified.

  For example, if the first song is recorded on the disc without the track being divided (that is, in one segment), the recording area of the first song is the start in the parts table indicated by the table pointer P-TNO1. And the end address.

  Also, for example, when the second music piece is recorded discretely on a plurality of segments on the disc, each segment is designated according to the temporal order to indicate the recording position of the music piece. In other words, from the part table specified in the table pointer P-TNO2, other part tables are further specified in accordance with the time order in accordance with the link information, and the part table in which the link information becomes “(00h)” is linked. (The same form as in FIG. 4 above). In this way, for example, all segments in which data constituting the second music is recorded are sequentially designated and recorded, so that the data of this U-TOC sector 0 is used to reproduce the second music or the second music. When overwriting the area, it is possible to access the optical head 3 and the magnetic head 6 to extract continuous music information from discrete segments, or to record using the recording area efficiently.

As described above, the area management on the disc is performed by the P-TOC, and the music and the free area recorded in the recordable user area are performed by the U-TOC.
The TOC information is read into the buffer RAM 13 so that the system controller 11 can refer to it.

Next, the format of the sector in which the audio data is recorded is set as shown in FIG.
In this sector (2352 bytes), the first 12 bytes are set as synchronization data, the subsequent 3 bytes are set for the cluster address and the sector address, the subsequent 1 byte is set as the mode, and the previous 16 bytes are set as the header. .

The 4 bytes following the header are used as a subheader, and the bytes following the subheader, that is, 2332 bytes from the 21st byte to the 2352nd byte of the sector are used as a data area (Data0 to Data2331).
In this 2332-byte data area, 11 units of 212-byte sound frames (see FIG. 11) are recorded.

In order to store these sectors (TOC sector and data sector), the buffer RAM 13 is used as shown in FIG.
It is assumed that the storage capacity of the buffer RAM 13 is set to 4M bits and that TOC information is held for 8 sectors.
Then, the first 12 bytes (addresses 0000h to 000Ch) are made free, and the following 18944 bytes from addresses 000Ch to 4A0Bh are used for the TOC. That is, eight areas from area 00 to area 07 each hold a TOC sector. Each area has 2368 bytes, and therefore, 16 bytes of additional data can be stored in addition to data for one sector of 2352 bytes (see FIGS. 2 and 3).

Further, addresses 4A0Ch to 07FC4Bh are used for audio data, that is, areas 08 to DC, each having 2368 bytes, are used for storage and reading of the audio data sector to realize the shock proof function described above. Yes. Here, each area has 2368 bytes, and therefore, 16 bytes of additional data can be stored in addition to data for 1 sector of 2352 bytes (see FIG. 5).
Addresses 07FC4Ch to 07FFFFh are vacant areas.

Here, 000Ch to 07F30Ch shown as the top addresses of the areas 00 to DC are calculated based on the count value of the sector to be written / read. That is, when the sector count value and N _S, the sector address is 940h × N _S + 0Ch. “+ 0Ch” is an offset for the first empty area.
Therefore, for example, the head address for the area 08 is calculated as 940h × 08h + 0Ch = 4A0Ch.

The configuration in each area of 2368 bytes is shown in FIG. 7 taking area 09 as an example.
In the area 09, audio data, that is, the sector of FIG. 5 is stored. In this area 09, 534Ch is the head address, and 2368 bytes (000h to 93Fh) up to the address 5C8Bh from this head are used as shown.

That is, since sector writing is executed in response to sync detection, the cluster address, sector address, and mode are stored first, followed by a 4-byte subheader, and then data Data0 to Data2331 are stored in order. Go. After that, a sync is written and one sector (2352 bytes) is stored. Here, 16 bytes remain after the sector is stored in the area, but in order to be able to store additional data in these 16 bytes (930h to 93Fh), a sector parameter storage area (additional area 09add) and Is done.
The address of each byte is obtained by adding the byte address to the head address (sector address) of the area. For example, the address of Data0 in area 09 is (940h × 09h + 0Ch) + 008h = 534Ch + 008h = 5354h.

Thus, in each area (area 00 to area DC) in the buffer RAM 13, additional areas (00add to DCadd) in which additional data can be stored corresponding to the sector data are set. Track number, progress time, track mode, link information, error information, etc. can be held in correspondence with the sector.
When the sector data is read, additional data accompanying it is also read and used for various operation management.
Hereinafter, the configuration and operation of the memory control device (memory controller 12) for using the buffer RAM 13 in such a form will be described.

  FIG. 8 is a block diagram showing the internal configuration of the memory controller 12. A disk drive interface unit 30 holds and exchanges recording / reproduction data Dt and TOC information TDt with respect to the disk drive side, that is, the encoder / decoder unit 8.

A RAM data interface unit 31 writes / reads data to / from the buffer RAM 13 and holds these data. The data to be written / read is the recording / reproduction data Dt and the TOC information TDt.
An audio compression interface unit 32 holds and exchanges recording / reproduction data Dt with respect to the audio compression unit, that is, the encoder / decoder unit 14.

  A controller interface unit 33 serves as an interface to the system controller 11. Here, the TOC information TDt is exchanged with the system controller 11, the control signal is input from the system controller 11, and these data are held.

Reference numeral 34 denotes an address counter, which is addressed data supplied via the controller interface unit 33, mode information, sector sync data detected by the disk drive interface unit 30 or the audio compression interface unit 32, and a RAM data interface unit. A write address / read address (M _Ad ) is generated by an operation described later based on the byte count signal supplied from 31 and the like, and is output to the buffer RAM 13.
B indicates a control bus connecting each part.

The configuration of the address counter 34 is shown in FIG.
A write sector counter 40 performs a count operation based on a sector sync to obtain an address for data writing to the buffer RAM 13, and 41 indicates a sector for obtaining an address for data reading from the buffer RAM 13. This is a read sector counter that performs a counting operation based on a sync. When the sector data read from the disk is written into the buffer RAM, any one of a cyclic mode, a straight-ahead mode, and a retry mode is given as the write operation, and the write sector counter 40 counts according to the mode. Is controlled.

42 is an adder / subtractor circuit that can increment the count value of the write sector counter 40 by +1 or −1, and 43 is an adder / subtracter circuit that can increment the count value of the read sector counter 41 by +1 or −1.
Reference numeral 44 denotes a selection circuit that selects and outputs one of the count values from the write sector counter 40, the read sector counter 41, and the addition / subtraction circuits 42 and 43. The selection operation is executed by a control signal supplied from the system controller 11 via the controller interface unit 33, for example.

Reference numeral 45 denotes a sector address calculation unit that performs N _S × 940h + 0Ch on the sector count value N _S output from the selection circuit 44. That is, the start address (the start address in sector units in the buffer RAM 13) for the area 00 to area DC described in FIG. 6 is calculated.

  46 is reset based on the sector sync in order to obtain a byte address for writing data to the buffer RAM 13 (the number of bytes in the sector), and performs a count operation in response to a byte count signal CT from the RAM data interface unit 31. A write byte counter 41 is reset based on the sector sync in order to obtain a byte address for reading data from the buffer RAM 13 (the number of bytes in the sector), and receives a byte count signal from the RAM data interface unit 31. This is a read byte counter that performs a counting operation by CT.

  Further, 48 generates a predetermined parameter offset in order to access each 16-byte additional area (00add to DCadd) provided in each area (area 00 to area DC) in the buffer RAM 13 as described above. It is a parameter offset generator. The parameter offset generator 48 is configured to generate “930h” to “93Fh” as parameter offsets for accessing the additional area in FIG.

A selection circuit 49 selects and outputs the output of the write byte counter 46, the read byte counter 47, or the parameter offset generation unit 48 as byte address data.
Reference numeral 50 denotes an address generation / output unit, which calculates an access address by adding the byte address output from the selection circuit 49 to the sector address output from the sector address calculation unit 45 and outputs this to the buffer RAM 13. Output.

  By configuring the address counter 34 as described above, when the sector data read from the disk 1 is stored in the buffer RAM at the time of reproduction in the recording / reproducing apparatus, the sector data is read from the buffer RAM 13 and reproduced data. In the recording / reproducing apparatus, when the input data is stored in the buffer RAM, when the data is read from the buffer RAM 13 and supplied as recording data, the sector address at that time By using the values of the sector counters 40 and 41 for generating, and the output of the parameter offset generator 48, the access address of the additional area can be obtained, and additional data can be written / read. Hereinafter, various examples of the access method for the additional area will be described.

  First, an example of the operation of recording additional data when data read from the disk is written to the buffer AM13 will be described. For this reason, the data read from the disk is written to the buffer AM13 during reproduction by the recording / reproducing apparatus. The operation according to the mode will be described with reference to FIG.

  As described above, when the sector data read from the disk is written to the buffer RAM, any one of a cyclic mode, a straight-ahead mode, and a retry mode is given as the writing operation. This is a mode control for writing a target sector to a predetermined area (any one of area 08 to area DC). When writing is started, a cyclic mode is first set. In the cyclic mode, the write sector counter 40 holds the count value at that time even when the sector sync is input.

  Therefore, when the address is specified from the area 08 in the cyclic mode, the sector address calculated by the sector address calculation unit 45 is always the address 4A0Ch, and writing is performed in the area 08 based on the count value of the write byte counter 46. Access is performed.

  Then, while there is a sector sync interrupt, the sector data is written to each byte, and it is determined whether or not the written sector is the target sector. If the sector is not the target sector, the sector data input in response to the sector sync interrupt is again written in each byte in the area 08 in accordance with the cyclic mode. That is, overwriting is executed in the cyclic mode until the target sector is written.

For example, when the target sector is written in the area 08, the straight mode is set at that time. In the straight running mode, the writing sector counter 40 counts up according to the sector sync.
Therefore, the access address becomes an address indicating the area 09 by the sector sync of the next sector, and the sector data is written to each byte of the area 09 after the sector sync.

  Thereafter, if there is no writing error, sector data is sequentially written in each area in the straight-ahead mode until the writing is completed (end of one writing operation in the intermittent writing operation).

  However, when moving to the straight-ahead mode or when the straight-ahead mode continues and moves to the next area, it is determined whether there is a write error for the sector written immediately before it, and if there is an error, the retry mode is Execute writing again.

  For example, when a write error in the area 09 is detected when the area 0A is entered, the retry mode is set and the count value of the write sector counter is decremented by 1, that is, the access address is an address in the area 09. Then, writing is continued according to the sector sync in the cyclic mode state in the area 09, and when the target sector is written, the mode returns to the straight-ahead mode.

  In the case of writing sector data in this way, when additional data corresponding to the sector is written in the additional area, an address is generated as follows.

  For example, in the example of FIG. 10, while the straight mode is selected and area 09 is being written, since appropriate sector data has already been written in area 08, additional data in area 08 is added. It is preferable that additional data for the written sector can be written in the area 08add. That is, it is only necessary to obtain the access address of the additional area 08add.

  For this reason, since the count value of the write sector counter 40 is a value indicating the area 09, the addition / subtraction circuit 42 performs −1 on the count value, and the selection circuit 44 selectively outputs the output of the addition / subtraction circuit 42. Thus, the sector address for the area 08 is obtained.

At the same time, the parameter offset corresponding to the byte to be written in the additional area is output from the parameter offset generator 48 via the selection circuit 49.
For example, if additional data is to be written as the parameter PRM20 at the 938h byte in the sector in FIG. 7, a parameter offset of “938h” is generated.

  As a result, the address generation / output unit 50 adds and synthesizes the parameter offset 938h to the sector address 4A0Ch of the area 08, and generates and outputs an address indicating the position of the parameter PRM20.

  In addition, when the additional data is written in correspondence with the sector to be written in the area in the cyclic mode, a predetermined parameter offset from the parameter offset generator 48 is output as it is, and this is selected by the selection circuit 49. If selected and output, an access address to a predetermined byte in the additional area 09add in the area 09 is generated.

  Next, when the sector data is read from the buffer RAM 13 and transferred as reproduction data, it is normally read in the order of areas 08, 09, 0A,..., For example, sector data reading for area 09 is performed. When this is transferred, it is preferable to read the additional data for the next sector (that is, the sector stored in the area 0A).

  In this case, a value obtained by adding +1 to the count value of the read sector counter 41 in the adder / subtractor circuit 43 is selectively output by the selector circuit 44. At the same time, a predetermined parameter offset from the parameter offset generator 48 is output and is selectively output by the selection circuit 49.

  Then, an address 64BCh indicating the area 0A is obtained as a sector address from the sector address calculation unit 45, and a parameter offset value is added to this, so that an address of a certain byte in the additional area 0Aadd in the area 0A is obtained. Become. Therefore, desired additional data can be read from the address.

Hereinafter, for various cases during the reproducing operation in the recording / reproducing apparatus, an example of a case where the parameter PRM00 of the first byte in the additional area is accessed will be exemplified as an example. Note that the write sector counter value at each time point is WSC, the read sector counter value is RSC, and the generated address is _Mad . Further, the +1 or -1 arithmetic processing for WSC or RSC is the processing of the addition / subtraction circuit 42 or 43, and is a value obtained by the selection circuit 44 selecting and outputting the output of the addition / subtraction circuit 42 or 43. is there. Further, the calculation of (× 940h + 0Ch) represents the processing in the sector address calculation unit 45 as described above. The parameter PRM00 is located in a byte corresponding to an offset position of 930h in the sector.

An address generation method for writing additional data as parameter PRM00 when recording sector data read from the disk into the buffer RAM.
a. When additional data (PRM00) is written for a sector in the preceding area during a certain area write in the straight mode or the cyclic mode.
M _ad = (WSC-1) × 940h + 0Ch + 930h
b. When additional data (PRM00) is written for a sector in the area during writing in a certain area in the straight mode or the traveling mode.
M _ad = WSC × 940h + 0Ch + 930h
c. When additional data (PRM00) is written for a sector to be written to the next area during a certain area write in the straight mode or the cyclic mode.
M _ad = (WSC + 1) × 940h + 0Ch + 930h

An address generation method for reading additional data stored as parameter PRM10 when sector data is read from the buffer RAM and output as reproduction data.
a. When additional data (PRM00) related to sector data in the area next to the area being read is read.
M _ad = (RSC + 1) × 940h + 0Ch + 930h
b. Reading additional data (PRM00) related to the sector data of the area being read.
M _ad = RSC × 940h + 0Ch + 930h
c. When additional data (PRM00) related to the sector data of the area preceding the area being read is read.
M _ad = (RSC-1) × 940h + 0Ch + 930h

In order to obtain access addresses for the parameters PRM01 to PRM33, the addition term of the above “930h”, that is, the parameter offset may be set to “931h” to “93Fh”.
Needless to say, whether the address is generated by the above-described methods a, b, or c at the time of writing or reading is determined by the output selection control of the selection circuits 44 and 49 of the system controller 11. .

  Even during the recording operation in this recording / reproducing apparatus, the access address of the additional area can be obtained by the same processing in the address counter 34.

  Since the address counter 34 is configured as described above, it is not necessary for the system controller 11 to calculate the address when accessing the additional data, and the access byte in the sector is automatically set only by specifying the parameter offset. The position can be an additional region. A sector that accesses the additional area can also be specified using a sector counter value or a value obtained by adding +1 or −1 to the sector counter value.

  Further, by obtaining the access address of the additional area using the value of the sector counter, the system controller 11 does not manage the relationship between the sector written in the buffer RAM 13 and the corresponding additional data and the address position in the buffer RAM 13. Additional information is held in the same area corresponding to the sector, and additional data corresponding to the sector can be read in accordance with the reading operation during reading.

  Note that the addition / subtraction circuits 42 and 43 are not necessarily required if the additional data is read and written for the sector that is always counted.

In the above embodiment, the memory control device and the address generation circuit are described as being applied to the recording / reproducing device for the magneto-optical disk 1. However, as a memory control device and address counter in a reproduction-only device, a recording-only device, and other devices. Can be applied.
Further, the configuration as the memory control device or the address counter is not limited to the configuration of the above embodiment.

It is a block diagram of the recording / reproducing apparatus of the Example of this invention. It is explanatory drawing of the P-TOC sector of a disk. It is explanatory drawing of the U-TOC sector of a disk. It is explanatory drawing of the management form of disk U-TOC. It is explanatory drawing of the data sector of a disk. It is explanatory drawing of the storage area of buffer RAM in the recording / reproducing apparatus of an Example. It is explanatory drawing of the storage area of buffer RAM in the recording / reproducing apparatus of an Example. 1 is a block diagram of a memory control device and a peripheral circuit unit according to an embodiment. FIG. 3 is a block diagram of an address generation circuit and a peripheral circuit unit according to an embodiment. It is explanatory drawing of the write-in operation | movement to the buffer RAM of an Example. It is explanatory drawing of the track format of a disc.

Explanation of symbols

1 disk, 3 optical head, 8 encoder / decoder,
11 system controller, 12 memory controller, 13 buffer RAM,
14 encoder / decoder unit, 30 disk drive interface unit,
31 RAM data interface unit, 32 audio compression interface unit,
33 Controller interface, 34 Address counter,
40 write sector counter, 41 read sector counter,
42, 43 addition / subtraction circuit, 44, 49 selection circuit, 45 sector address calculation unit,
46 Write byte counter, 47 Read byte counter,
48 Parameter offset generator, 50 Address generator / output unit

Claims (2)

And the reproduced data, a header and a first additional data relating to the sync data and the reproduced data, the sub data and reproduction apparatus sector data for reproducing the reproduction data from the recording medium which is recorded in sectors comprising a In
Reproducing means for reproducing the sector unit header, the sub data, and the reproduction data from the recording medium,
Additional data generating means for generating second additional data used for various operation management associated with the sector unit reproduction data;
Memory means for storing data ;
Control means for controlling the reproduction of the reproduction data;
Said to be stored in said memory means in sectors in the first additional data and the sub data and the reproduced data and sync data and sequentially a single sector and the second additional data, has been stored in the memory means the a first additional data and the reproduced data and the second additional data reproducing apparatus comprising: a memory control means for creating read out from said memory means. A reproduction method for reproducing the reproduction data from a recording medium in which sector data including reproduction data , sync data and first additional data related to the reproduction data, and sub data is recorded in units of sectors. In
Control playback of the header and the sub-data and the playback data units of a sector from the recording medium,
Generating second additional data used for various operation management associated with the reproduced data reproduced in association with the sector of the reproduced data;
Using the memory control means, the first additional data, the sub data, the reproduction data, the sync data, and the second additional data are sequentially stored in a single sector in the memory means in a sector unit,
Using the memory control means, the first additional data, the reproduction data, and the second additional data stored in the memory means are read from the memory means,
Controlling the reproduction of the reproduction data read out from said memory means,
Playback method.

Images