JP3669350B2 - Recording / reproducing apparatus and search circuit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording / reproducing apparatus capable of recording data such as music on a disk-shaped recording medium, and a search circuit provided in the recording / reproducing apparatus.
[0002]
[Prior art]
Data rewritable disc media that allow users to record music data and the like are known, and in such disc media, areas (segments) where data such as music is already recorded and unrecorded areas (segments) ) Is managed, and the management data is also rewritten at the end of each recording operation or erasing operation of recorded music, for example.
[0003]
For example, when recording a certain piece of music, the recording device finds an unrecorded area on the disk from the U-TOC and records audio data therein. In the playback device, the area where the music to be played back is recorded is determined from the U-TOC, and the playback operation is performed by accessing the area.
[0004]
By the way, in recordable disk media such as magneto-optical disks (MO disks), random access is extremely easy as compared to tape-like recording media such as DAT and compact cassette tapes. It is not necessary to record in the segment (in this specification, “segment” means a track portion where physically continuous data is recorded), and it is divided into a plurality of segments discretely on the disc. There is no problem even if you record.
[0005]
In particular, in a system in which data read from a magneto-optical disk is temporarily stored in a buffer memory at a high rate and read out from the buffer RAM at a low rate and demodulated as an audio reproduction signal, temporary access is caused by access between segments. Therefore, even if data reading from the magneto-optical disk is interrupted, the reproduced sound can be output without interruption.
[0006]
Therefore, if a recording / playback operation within a segment and a high-speed access operation (access operation that ends within a reproducible time due to the amount of data accumulated due to the difference between the write rate and read rate of the buffer RAM) are repeated, one piece of music Even if the track is physically divided into a plurality of segments, it is possible to prevent the music from being recorded / reproduced.
[0007]
For example, as shown in FIG.₁ The second song is segment T₂ Is recorded continuously, but segment T is the fourth and fifth songs._{4 (1)}~ T_{4 (4)}, T_{5 (1)}~ T_{5 (2)}As shown in FIG. 5, it is also possible to divide and record on tracks. (Note that FIG. 18 is a schematic illustration only, and in practice, one segment often covers several to several hundred tracks or more.)
[0008]
When recording and erasing of music is repeated on the magneto-optical disk, empty areas on the track are irregularly generated due to the difference in the performance time of the recorded music and the performance time of the erased music. By performing discrete recording, it becomes possible to record, for example, a song longer than the erased song by utilizing the erased portion, and the data recording area is wasted due to repeated recording / erasing. That is solved. Note that what is recorded is not necessarily limited to “music”, and any audio signal may be included. In the present specification, a piece of data (recording data unit) that is continuous in terms of content is “music”. It will be expressed as
[0009]
Of course, for such disk media, recording is continued while accessing a plurality of unrecorded segments during recording, and segments are recorded so that one piece of music is played back correctly and continuously during playback. It must be accessed. A segment in one piece of music necessary for this (eg T_{Four( 1)}~ T_{4 (4)}) And data indicating unrecorded areas are held as U-TOC information that is rewritten for each recording operation and erasing operation as described above, and the recording / reproducing apparatus is loaded with, for example, a disc. At this point, the U-TOC information is read and stored in the memory. During recording / reproducing / erasing operations, the head is accessed based on the U-TOC information held in the memory, thereby controlling the recording / reproducing / erasing operations properly.
[0010]
As shown in FIG. 19, the recording track on the magneto-optical disk is formed by continuously forming a cluster CL (= 36 sectors−) consisting of a 4-sector (1 sector = 2352 bytes) sub-data area and a 32-sector main data area. 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.
[0011]
The sectors are further subdivided into sound groups, and two sectors are divided into 11 sound groups. In the sound group, 512-sample 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.
[0012]
Here, the U-TOC editing operation according to recording or erasing will be described.
FIG. 20 schematically shows the area structure of the track of the disk in the radial direction. First, the area structure will be described.
[0013]
In the case of a magneto-optical disk, roughly, as shown as a pit area in FIG. 20, an area where data is recorded by embossed pits (pre-mastered area) and a groove area where a groove is provided as a so-called magneto-optical area. It is divided into.
[0014]
Here, as the pit area, pre-mastered TOC (hereinafter referred to as P-TOC) as management information is repeatedly recorded, and in this P-TOC, the U-TOC position is the U-TOC start address UST._A And the lead-out start address RO_A Recordable user area start address RST_A , Power cal area start address PC_A Etc. are shown.
[0015]
A groove area is formed following the innermost pit area of the disc. The lead-out start address RO in the P-TOC in the groove area._A The area up to the address shown as is a recordable area that can be recorded, and the subsequent area is a lead-out area.
[0016]
Further, among the recordable areas, a recordable user area where data is actually recorded is a recordable user area start address RST in the P-TOC._A As the location (address A_MIN ) Lead out start address RO_A Previous position (address A_MAX ) Until.
[0017]
Then, in the groove area, the recordable user area start address RST_A The previous area is a management area for recording / reproducing operation, the above-mentioned U-TOC etc. are recorded, and the power cal area start address PC_A One cluster from the position shown as is provided as a laser power calibration area.
[0018]
The U-TOC is recorded continuously at a required position in the management area for the recording / reproducing operation in three clusters, and the address position at which the U-TOC is recorded depends on the U-TOC in the P-TOC. TOC start address UST_A Will be shown.
[0019]
In the U-TOC, the recording status of the recordable user area is provided as management information.
[0020]
Now, as shown in FIG. 20, there are four songs M in the recordable user area.₁ ~ M_Four Is recorded. That is, address A₁ (= A_MIN ) ~ A₂ The first song M in the segment₁ Is recorded, and the second song, M₂ Is address A_Three ~ A_Four M recorded in the segment of_{2 (1)}And address A₁₁~ A₁₂M recorded in the segment of_{2 (2)}It is recorded in a split.
[0021]
In addition, the third song M_Three Is address A_Five ~ A₆ The fourth song M is recorded in the segment_Four Is address A₉ ~ A_TenM recorded in the segment of_{4 (1)}And address A₁₃~ A₁₄M recorded in the segment of_{4 (2)}Suppose that it is recorded in a bit.
[0022]
In this state, an unrecorded area where no music is recorded yet, that is, a newly recordable free area is address A.₇ ~ A₈ Segment (F₍₁₎ ) And address A₁₅~ A₁₆(= A_MAX ) Segment (F₍₂₎ )
[0023]
This state is managed in the U-TOC as shown in FIG.
In the U-TOC, as shown in FIG. 21, there is provided a correspondence table instruction data section composed of various table pointers (P-DFA, P-EMPTY, P-FRA, P-TNO1 to P-TNO255). Corresponding to this, a management table section having 255 part tables (01h) to (FFh) is provided. Each part table indicates a start address, an end address, and a track mode for one segment on the disk, and link information for linking to another part table is recorded.
Then, a part table is indicated by various table pointers in the correspondence table instruction data section, and segments are managed.
[0024]
The table pointer P-DFA indicates a defective area on the disc. If it is assumed that there is no defect in the recordable user area in FIG. 20, the table pointer P-DFA is set to “00h”. Subsequently, the table pointer P-EMPTY indicates an unused parts table.
[0025]
The table pointer P-FRA is for managing an unrecorded area (free area). Here, it is assumed that a part table of (01h) is shown in the table pointer P-FRA (note that each table is actually In the pointer, the part table is indicated by a numerical value by which the address of the part table can be obtained by a predetermined calculation process).
[0026]
In this case, the parts table (01h) correspondingly has a free area F in FIG.₍₁₎ Information about is shown, ie address A₇ Is the start address, address A₈ Is shown as the end address. In addition, as other segment free area F₍₂₎ Therefore, the parts table (09h) is shown as the link information of the parts table (01h) (a numerical value at which the address of a certain parts table can actually be obtained by a predetermined arithmetic processing is shown as the link information. ing).
[0027]
And the parts table (09h) has free area F₍₂₎ Corresponding to address A₁₅Is the start address, address A₁₆Is shown as the end address. Since there is no other segment that becomes a free area, there is no need to link to another parts table, and the link information is set to “00h”.
[0028]
By managing the free area in this way, for example, when recording, if the part table is searched starting from the table pointer P-FRA, the address of the segment that becomes the free area is obtained, and the music is stored in that segment. Etc. can be recorded.
[0029]
Music already recorded in the same form is also managed. As for music, up to 255 music can be managed by the table pointers P-TNO1 to P-TNO255.
[0030]
For example, the first song M₁ Is the start address A in the part table (02h) indicated by the table pointer P-TNO1.₁ And end address A₂ Is shown. Music M₁ Is recorded in one segment. In this case, the link information of the parts table (02h) is “00h”.
[0031]
The second song M₂ For the start address A in the parts table (04h) indicated by the table pointer P-TNO2._Three And end address A_Four It is shown. Music M₂ Is recorded in two segments, address A_Three And address A_Four Is music M₂ The first half of (M_{2 (1)}) Segments only. Therefore, for example, the parts table (06h) is shown as the link information of the parts table (04h), and the latter half (M_{2 (2)}) To indicate the segment of start address A₁₁And end address A₁₂Is recorded. Since no link is required thereafter, the link information of the parts table (06h) is set to “00h”.
[0032]
3rd song M_Three , 4th song M_Four Also, the segment positions are managed by the parts table obtained from the table pointers P-TNO3 and P-TNO4, respectively. Since only four songs are recorded, the table pointers P-TNO5 to P-TNO255 are not used and are set to “00h”.
[0033]
As described above, by managing the segment position of each music piece, even if the music order is irregular or divided and recorded in two or more segments, the reproduction operation can be executed properly.
[0034]
Further, the table pointer P-EMPTY is for indicating an unused part table as described above. In this example, the table pointer P-EMPTY indicates the part table (08h). Then, as shown by the link information from the part table (08h), the part tables (FFh) that are not used are connected and managed. The link information of the part table (part table (FFh) in this case) which is the last of the connection of the unused parts table is set to “00h” as there is no connection thereafter.
[0035]
By the way, while recording / deleting music, etc., a waste area (trash area) that is not managed by the U-TOC in the above management form occurs. This is because, for example, a guard band area for several clusters is provided before and after recording so that the data of other tracks is not accidentally erased at the time of recording the music, and further recording is performed in cluster units. This is caused by the fact that the recording start position is defined, and further, the part of the music is deleted or the music is edited to be synthesized.
[0036]
For example, in the case of FIG. 20, the portion indicated by the hatched portion, that is, the address A_Four ~ A_Five , Address A₆ ~ A₇ , Address A₁₂~ A₁₃Are generated as trash areas, and the segments that become these trash areas do not appear on the management form of the U-TOC shown in FIG. If such a trash area is generated, the recording capacity of the disc will be reduced accordingly. Therefore, the U-TOC is re-edited at a certain point in time to eliminate the trash area. It was. For example, the U-TOC editing process is executed when a certain piece of music is deleted, when U-TOC re-editing is instructed by a user operation, or when the control device determines that the trash area has increased.
[0037]
Here, an example of editing processing according to the erasing operation will be described.
As shown in FIG. 22 from the state of FIG._Three Suppose you want to erase. At this time, music M_Three Will be included in the free area._Three The trash area located before and after the segment is also included in the free area, and the subsequent address A₇ ~ A₈ Free area F₍₁₎ And address A as shown in FIG.₁₇~ A₈ As new free area F₍₁₎ Is set, address A_Four ~ A_Five And address A₆ ~ A₇ The trash area will be eliminated. That is, the U-TOC may be rewritten so that the recordable user area is newly managed by the U-TOC in the state of FIG.
[0038]
Therefore, in such a recording apparatus, the U-TOC information held in the memory is rewritten from the state of FIG. 21 to the state of FIG. In FIG. 24, the hatched portion indicates the portion rewritten from the state of FIG.
[0039]
That is, free area F₍₁₎ The start address of the parts table (01h) indicating₁₇In addition, the music M_Three Music M_Four Goes up and the song M_Three It is said. That is, the data written in the table pointer P-TNO4 (that is, data indicating the parts table (07h)) is written in the table pointer P-TNO3, and the table pointer P-TNO4 is set to “00h”. Until then, Music M_Three Since the parts table (03h) indicating the segment is no longer necessary, it is linked from the parts table (FFh), linked from the table pointer P-EMPTY, and managed as an unused parts table.
The state shown in FIG. 23 is realized by editing the U-TOC as shown in FIG.
[0040]
[Problems to be solved by the invention]
However, in order to perform such editing, the parts table in the U-TOC is searched and the music M_Three It is necessary to discriminate between the segment where the track was recorded and the segment adjacent to the front and back, and whether the segment is the area where the music was recorded or the free area, and there is a trash area between these segments. You must also determine whether it exists.
[0041]
In particular, as can be seen from FIG. 21, from the parts table, it is not known which segments are actually adjacent to the segment shown in a certain parts table. Read in order and become the reference segment (in this case the erased music M_Three It is necessary to perform a search operation that the closest segment is an adjacent segment.
[0042]
Normally, such a recording apparatus is provided with a memory controller that outputs a memory write / read address and sends / receives stored data to / from a memory that holds the U-TOC, and further provides a system for the memory controller. A controller (microcomputer) performs operation control to execute data storage / reading. The system controller reads the U-TOC from the memory and controls the actual recording operation and the like, and also performs the U-TOC editing operation. For this editing operation, the system controller As described above, all the part tables are searched through the memory controller, and the address comparison operation for each searched part table is performed to search for adjacent segments.
[0043]
For this reason, the communication of the parts table data from the memory (memory controller) to the system controller takes an enormous amount of time, and the processing load is significantly increased due to these communication operations and comparison processing. There is.
In particular, when the memory controller and the system controller exchange data via serial communication, for example, if processing of the trash area is performed by the editing operation as described above, the processing time of about 2 minutes is required at worst. Such a need for processing time is very inconvenient for practical use of the recording apparatus.
[0044]
[Means for Solving the Problems]
The present invention has been made in view of these problems, and an object of the present invention is to enable a remarkable speed-up of U-TOC editing processing and reduction of processing load on a system controller at the same time.
[0045]
Therefore, the search circuit manages the recording data area where the recording data is recorded, the unrecorded area where the recording data is not recorded, and the start position and the end position of each of the recording data area and the unrecorded area. In a search circuit that includes a management data recording area in which data is recorded and that searches for a useless area that is not managed by management data adjacent to a predetermined unrecorded area from a recording medium on which the recorded data can be discretely recorded Memory for managing and storing management information recorded on the medium, reference data register means for holding the position of a predetermined unrecorded area as a search reference, and extracting search target data from data read from the memory by a search operation The output selection means for outputting the data and the search target data output from the output selection means as search data. Search data register means, search target data position register means for holding position information of search target data based on search target data output from output selection means, reference data held in reference data register means and output selection First comparison means for comparing the search target data output from the means, and second comparison means for comparing the search data held in the search data register means and the search target data output from the output selection means Based on the comparison result of the first and second comparison means, search object data output from the output selection means for updating the search data in the search data register means is held in the search data register means, and the search data The search target data position held in the search target data position register means for updating the search position information of the position register means Information is composed of an update control means which allow it to be held in the search data position register means.
[0046]
The update control means controls the search data register means to hold the end position of the search target data in the case of a search for a waste area located in front of the predetermined unrecorded area. In the case of searching for a useless area located behind the recording area, the search data register means is controlled to hold the start position of the search target data.
[0047]
Further, in the case of searching for a waste area located in front of a predetermined unrecorded area, the first comparison means determines whether or not the end position provided in the search target data output from the output means is before the search reference. And the second comparing means compares whether or not the search data held in the search data register is before the end position provided in the search target data output from the output selecting means, and determines a predetermined unrecorded area. In the case of the search for the waste area located behind the first comparison means, the first comparison means compares whether or not the end position provided in the search target data output from the output means is after the search reference, and the second comparison means. The comparison means compares whether the search data held in the search data register is after the end position included in the search target data output from the output selection means.
[0048]
Further, there is recorded management data for managing a recording data area in which recording data is recorded, an unrecorded area in which no recording data is recorded, and a start position and an end position of each of the recording data area and the unrecorded area. In a recording / reproducing apparatus for searching for a useless area not managed by management data adjacent to a predetermined unrecorded area from a recording medium capable of discretely recording the recorded data and managing the recording data from the recording medium Reproducing means for reproducing management data recorded in the data recording area, memory for managing and storing management information recorded on the recording medium reproduced by the reproducing means, and searching for a position of a predetermined unrecorded area A reference data register means that is held as a reference, and an output for extracting and outputting search target data from data read from the memory by a search operation. Selection means, search data register means capable of holding search target data output from output selection means as search data, and position information of search target data based on search target data output from output selection means Search target data position register means, first comparison means for comparing reference data held in the reference data register means and search target data output from the output selection means, and search held in the search data register means In order to update the search data of the search data register means based on the comparison result of the second comparison means for comparing the data and the search target data output from the output selection means, and the first and second comparison means The search object data output from the output selection means is held in the search data register means, and the search data position register means is detected. Update control means for allowing search object data position information held in search object data position register means to update position information, and search data held in search data register Control means for editing the management information stored in the memory so as to erase the wasted area searched by merging the wasted areas adjacent to the prescribed empty area based on the Recording means for writing back the management information stored in the memory to the management data recording area of the recording medium.
[0049]
[Action]
The present invention holds a position of a predetermined unrecorded area as a search reference, extracts search target data from data read from a memory by a search operation, holds the search target data, and stores position information of the search target data as a search target To update the search data based on the first comparison result held in the data position register means and comparing the reference data and the search target data and the second comparison result comparing the search data and the search target data The search target data is held in the search data register means, and the search target data position information is held in the search data position register means for updating the search position information.
For this reason, the search circuit executes the process of searching for the segment before and after the segment serving as the editing reference, so that the system controller does not need to execute the search and the processing load on the system controller is reduced.
[0050]
【Example】
Hereinafter, an embodiment of a memory control device and a memory data search circuit according to the present invention will be described with reference to FIGS. In this embodiment, a memory control device provided in a recording / reproducing apparatus using a magneto-optical disk as a recording medium and a memory data search circuit provided in the memory control device are used.
[0051]
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.
[0052]
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.
[0053]
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.
[0054]
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 signals, tracking error signals, focus error signals, 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.
[0055]
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).
[0056]
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.
[0057]
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.
[0058]
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.
[0059]
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.
[0060]
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.
[0061]
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.
[0062]
The system controller 11 also controls a laser control signal S for controlling the operation of the laser diode in the optical head 3._LPThe output of the laser diode is controlled on / off, and at the time of on control, the output during reproduction when the laser power is relatively low and the output during recording where the laser power is relatively high Can be switched.
[0063]
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.
[0064]
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.
[0065]
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.
[0066]
When performing recording / reproducing operation on the disk 1, management information recorded on the disk 1, that is, P-TOC and U-TOC are read out, and the system controller 11 responds to these management information. The address of the segment to be recorded on the disc 1 and the address of the segment to be reproduced are discriminated, but 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.
[0067]
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.
[0068]
The U-TOC is edited in accordance with data recording and erasing, and may be edited and rewritten with a merge process for eliminating the trash area as described above. Each time the operation is performed, this editing process is performed on the U-TOC information stored in the buffer RAM 13, and the U-TOC area of the disk 1 is also rewritten at a predetermined timing in accordance with the rewriting operation.
[0069]
Here, P-TOC and U-TOC in the disc 1 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.
[0070]
The format of P-TOC is shown in FIG.
FIG. 14 shows one sector (sector 0) of P-TOC information repeatedly recorded in an area for P-TOC (for example, the ROM area on the innermost side of the disk).
[0071]
The data area of the sector of the P-TOC is configured as a data area of 4 bytes × 588 (= 2336 bytes), for example, and has a synchronization pattern consisting of 1 byte data of all 0 or all 1 at the head position, and a cluster address and a sector address. 4 bytes are added, and the header is used to indicate the P-TOC area.
[0072]
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 recorded first song number (First TNO), the last song number (Last TNO), and the lead-out start address RO_A , Power cal area start address PC_A , Start address UST of U-TOC (data area of U-TOC sector 0 in FIG. 15 described later)_A , Start address RST of recordable area_A Etc. are recorded.
[0073]
In these 24-bit (3-byte) start addresses, as shown in FIG. 17A, the upper 16 bits are the cluster address and the lower 8 bits are the sector address. Then, as described above in FIG. 20, area management on the disk 1 is performed by these start addresses.
[0074]
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.
[0075]
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. (A numerical value with “h” 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).
[0076]
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. .
[0077]
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.
[0078]
Note that the start address and end address of 24 bits (3 bytes) in these parts tables are the cluster address, the next 6 bits are the sector address, and the lower 4 bits are the sound group address, as shown in FIG. 17B. It is said that.
[0079]
Similarly, for the second music, the start address, end address, and track mode information of the recording position of the second music 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.
[0080]
As will be described later with respect to the present embodiment, the disk on which the U-TOC editing operation is performed is a recordable / reproducible magneto-optical disk, and in this case, there is no so-called pre-mastered music area. The correspondence table instruction data portion and the management table portion described above are not used (these are managed by the U-TOC which will be described later), and therefore each byte is 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. .
[0081]
Next, U-TOC will be described.
FIG. 15 shows the format of one sector of U-TOC, in which data on which management information is recorded mainly about 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.
For example, when recording a certain piece of music on the disk 1, the system controller 11 searches the U-TOC for a free area on the disk, and can record audio data here. Has been made. 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.
[0082]
The U-TOC sector (sector 0) shown in FIG. 15 is provided with a header in the same manner as the P-TOC, and then 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 associated with the management table part to be described later, and various table pointers (P-DFA, P-EMPTY, P-FRA, P-TNO1 to P-TNO255) are recorded as the correspondence table instruction data part. An area is prepared.
[0083]
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. 14, 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.
[0084]
As shown in FIG. 17B, the 24 bits (3 bytes) start address and end address in these parts tables are the cluster address, the next 6 bits are the sector address, and the lower 4 bits are the sound group address. Has been.
[0085]
As described above, in this type of recording / reproducing apparatus, for example, data of one piece of music is physically discontinuous, that is, even if it is recorded over a plurality of segments, it is reproduced while being accessed between segments. Since there is no hindrance, music recorded by the user may be divided into a plurality of segments for the purpose of efficient use of the recordable area. 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 normally divided into segments, the link information in the P-TOC sector 0 is all “(00h)” as shown in FIG. 14).
[0086]
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.
[0087]
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:
[0088]
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.
[0089]
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. When 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.
[0090]
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.
[0091]
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)”.
[0092]
FIG. 16 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 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.
[0093]
Table pointers P-TNO1 to P-TNO255 indicate the music recorded by the user on the magneto-optical disk 1. For example, the table pointer P-TNO1 includes 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.
[0094]
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.
[0095]
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 FIG. 16 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.
[0096]
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.
[0097]
These pieces of TOC information are read into the buffer RAM 13 so that the system controller 11 can refer to them. As described above, for example, when an erasing operation is performed, a U including a merge process for erasing the trash area is included. -The TOC editing process will be performed. The memory control device and the memory data search circuit of this embodiment are configured with a configuration suitable for this processing.
The memory control device of this embodiment is constituted by the control function for the memory controller 12 and the system controller 11 in the recording / reproducing device of FIG. 1, and the memory data search circuit of this embodiment is a memory. It is provided inside the controller 12.
[0098]
Hereinafter, these memory control device, memory data search circuit, and U-TOC editing process to be executed will be described with reference to FIGS.
FIG. 2 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.
[0099]
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.
[0100]
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 from the system controller 11 is input, and these data are held.
[0101]
An address counter 34 is a write address / read address (M) based on a control signal from the system controller 11._Ad) And output to the buffer RAM 13.
[0102]
Reference numeral 35 denotes a memory data search circuit. When various control signals are input from the system controller 11 via the controller interface unit 33, a search operation for the TOC information TDt held in the buffer RAM 13 can be performed based on the control signals. Has been made.
B indicates a control bus connecting each part.
[0103]
The configuration of the memory data search circuit 35 is shown in FIG.
Reference numeral 40 denotes an output selection unit, and 41 denotes a reference address register constituted by a D flip-flop. The reference address register 41 is supplied to the reference address register 41 via the controller interface unit 33 from the system controller 11._ref Is set. This reference address AD_ref This corresponds to the start address or end address of a segment serving as a reference in the U-TOC editing process described later.
[0104]
Further, the output selection unit 40 uses, for example, a reference address AD from data read from the buffer RAM 13 (data in the U-TOC parts table) during a search operation to be described later._ref Address AD to be compared with_R Is output.
[0105]
Reference numeral 42 denotes a proximity address register constituted by a D flip-flop, and an address AD output from the output selection unit 40._R Is made to be able to latch. Finally, the address AD latched in the proximity address register 42_prevIs a search address obtained by the search processing of the memory data search circuit 34.
[0106]
Reference numeral 43 denotes a temporary register, and a search target address AD output from the output selection unit 40._R The link information (or table pointer) recorded in the same parts table is input, and the link information input this time and the link information input last time are held in a two-stage register configuration, for example. The link information that was previously input and held is the search target part information LK._R And
[0107]
Reference numeral 44 denotes a link register, which is search target part information LK output from the temporary register 43._R Search parts information LK_prevIt can be latched as The link register 44 is composed of a D flip-flop.
[0108]
45 is a reference address AD latched in the reference address register 41._ref And the search target address AD output from the output selection unit 40_R The comparison unit 46 compares the search target address AD output from the output selection unit 40._R And the search address AD latched in the proximity address register 42_prevIt is a comparison part which compares.
[0109]
Reference numeral 47 denotes a control logic, which outputs a latch signal to the proximity address register 42 and the link register 44 based on the comparison results by the comparison units 45 and 46, and outputs from the output selection unit 40 to the proximity address register 42. Search target address AD_R A new search address AD_prevSearch address AD_prevThe update target part information LK latched in the temporary register 43 for the link register 44 is executed._R Is new search parts information LK_prevSearch parts information LK so that_prevThe update operation is executed.
[0110]
By providing such a memory data search circuit 35 in the memory controller 12, for example, when a U-TOC is edited in response to deletion of a certain piece of music, the segment (edit) in which that piece of music is deleted is edited. The segment before and after the segment) is searched, and if there is a trash area, merge processing is performed to eliminate the trash area (see FIGS. 20 to 24). The process of searching for the segment before and after the segment to be executed is executed by the memory data search circuit 35, and the system controller 11 does not need to execute the search.
[0111]
The merge process in the U-TOC editing process will be described with reference to the flowcharts of FIGS. The merge process includes a merge process at the front (inner side of the disk) and a merge process at the rear (at the outer side of the disk) of the segment serving as the editing reference. The processes of the system controller 11 relating to this are divided into FIGS. I will explain.
[0112]
The process of the system controller 11 as the forward merge process is as shown in FIG.
First, the system controller 11 sets the segment start address as the reference address N as the reference address._ref Is set internally (F101). For example, as shown in FIGS.₂₆~ A₂₇If the music is recorded in the segment (shaded portion) of this and the merge process is executed in response to the deletion, the address A that is deleted and replaces the free area₂₆~ A₂₇This segment becomes the editing reference segment (reference free area), and the start address A of this reference free area₂₆Is the reference address N_ref Set as
[0113]
5 to 8 show various cases in front of the reference free area, and FIG. 5A shows a segment in which music is recorded through the trash area in front of the reference free area. FIG. 6 shows a case where there is a segment in which music is recorded immediately in front of the reference free area and there is no trash area. FIG. When there is an area segment, FIG. 8A shows a case where there is a segment that becomes a free area immediately before the reference free area and there is no trash area. The process determines whether the current state corresponds to this state, and performs a merge process accordingly.
[0114]
Reference address N_ref Then, the system controller 11 causes the memory controller 12 to execute the forward search mode. That is, the memory controller 12 determines whether the front adjacent position of the reference free area is in any of the states of FIGS. 5A, 6, 7A, and 8A (F102).
[0115]
For this purpose, the reference address N is stored in the reference address register 41 of the memory data search circuit 35 via the controller interface unit 33 of the memory controller 12._ref As well as a latch control command and a reference address N_ref To the reference address register 41_ref Let me hold as.
[0116]
Similarly, the search address AD is used for the proximity address register 42._prevAddress A as the initial value of_MIN And latch it. Address A_MIN Is the address of the head position of the recordable user area as shown in FIG.
Furthermore, the search part information LK in the link register 44_prevTo clear.
[0117]
Further, the search mode signal S_SMIs output to the output selection unit 40 and the control logic 47. Search mode signal S_SMIs a signal for identifying to the memory data search circuit 35 whether to execute the forward merging process or the backward merging process.
[0118]
Search mode signal S indicating forward merge processing_SMIs output, the output selection unit 40 uses the end address of the read part table address data in the U-TOC as the search target address AD._R Is set to output as
[0119]
Further, the search mode signal S indicating the forward merging process._SMThus, the control logic 47 uses the reference address AD in the comparison unit 45._ref And search target address AD_R By comparing AD_R <AD_ref And the search address AD in the comparison unit 46 is obtained._prevAnd search target address AD_R Comparison of AD_prev<AD_R Is obtained, a latch control signal is output to the proximity address register 42 and the link register 44, and the search address AD is output._prevAnd search parts information LK_prevSet to cause updates to be performed.
[0120]
When the system controller 11 turns on the forward search mode for the memory controller 12 in this way, the U-TOC stored in the buffer RAM 13 is first searched for the part table derived from the table pointer P-FRA. Control to execute (F103). That is, the memory controller 12 is caused to execute a read scan of the parts table relating to the free area. Then, it waits until this read scan is completed (F104).
[0121]
In this read scan, the memory data search circuit 35 of the memory controller 12 searches for a segment that is the closest free area in front of the reference free area.
That is, the memory controller 33 sequentially generates an address for the part table derived from the table pointer P-FRA by the address counter 34, whereby the data of the part table for the free area is sequentially transmitted via the RAM data interface unit 31. It is captured. Here, the data fetched from one parts table is a total of 8 bytes including a start address 3 bytes, an end address 3 bytes, track mode information 1 byte, and link information 1 byte.
[0122]
When the memory data search circuit 35 fetches these data via the controller interface unit 33, first, link information is fetched into the temporary register 43.
[0123]
However, at the start of this read scan, the table pointer P-FRA is taken into the temporary register 43, and when the first parts table is read, the temporary register 43 stores the table pointer P-FRA as the previous link information. The value of the table pointer P-FRA and the link information fetched this time are respectively held by the two-stage register configuration. At this time, the temporary register 43 sets the value of the table pointer P-FRA to the search target part information LK._R Will hold as.
[0124]
Further, the end address recorded in the parts table from the output selection unit 40 is the search target address AD._R Is output as
Then, in the comparison unit 45, the reference address AD_ref (In this case, address A₂₆) And search target address AD_R (The end address of the parts table) is compared.
[0125]
Where AD_R > AD_ref If it is, it means that the read part table is a part table for a segment located behind the reference free area, and conversely AD_R <AD_ref If it is, it means that the read part table is a part table for a segment located in front of the reference free area.
[0126]
The comparison unit 46 also searches the search address AD._prev(In this case, the first address A is the initial value._MIN ) And search target address AD_R (End address of the read parts table) is compared.
[0127]
Where AD_R > AD_prevThe read parts table is the search address AD_prevIs the segment behind the segment whose end address is indicated in_R <AD_prevIf this is the case, the read parts table is the search address AD_prevThis is a segment ahead of the segment whose end address is shown in FIG.
However, the search address AD is still_prevFor parts tables that have been read at the time that has not been updated, the search address AD to be compared_prevIs the initial value A_MIN Because it is said that it is always AD_R > AD_prevIt becomes.
[0128]
Here, the comparison unit 45 performs AD_R <AD_ref (Search address AD_prevIs the initial value A_MIN In the case of AD, the comparison unit 46_R > AD_prevAs a result, it is determined that the read part table is a part table indicating a segment of the free area that is located in front of and relatively close to the reference free area, and the control logic 47 detects the proximity address register 42. And a latch control signal is output to the link register 44, and the address AD_R A new search address AD_prevAnd the search target part information LK latched in the temporary register 43_R Search part information LK in the link register 44_prevAs latch.
[0129]
Search target part information LK in the temporary register 43_R Is the link information (in this case, the value of the table pointer P-FRA in this case) in the part table read last time, and thus the search address AD in the proximity address register 42 is thus obtained._prevIs updated at the same time as the updated AD_prevThe position information of the parts table in which the end address that is the value of is stored in the link register 44 is searched part information LK_prevWill be held as.
[0130]
As a result, the end address of the segment ahead of the reference free area becomes the search address AD._prevAnd the position of the parts table indicating the segment is the search link information LK_prevAs shown.
[0131]
Subsequently, the part table linked from the part table is read according to the read scan, and the link information in this part table is taken into the temporary register 43. At this time, the search target part information LK in the temporary register 43_R Is the link information fetched last time, that is, search target part information LK_R The position on the U-TOC of the part table fetched this time is indicated.
Further, the end address of the parts table is retrieved from the output selection unit 40 by the search target address AD._R Is output as
[0132]
At this time, the search target address AD_R And reference address AD_ref Are compared by the comparison unit 45, and further the search target address AD_R And search address AD_prevAre compared by the comparison unit 46, and as a result, AD_R <AD_ref And AD_R > AD_prevIf so, the read-out part table has an end address at that time as a search address AD._prevThis is a part table for a segment located closer to the front side than the reference free area than the part table held as.
[0133]
Therefore, the control logic 47 causes the proximity address register 42 and the link register 44 to execute latch, and the search address AD._prevIs updated to be the end address in the read parts table, and the search part information LK_prevLink information indicating the position of the read parts table, that is, the search target part information LK in the temporary register 43 at this time_R It is updated to the value held as.
[0134]
Subsequently, the linked parts table is sequentially read, and each time the comparison operation by the comparison units 45 and 46 is executed, and as a result AD_R <AD_ref And AD_R > AD_prevIf so, the search address AD of the proximity address register 42_prevAnd link part 44 search part information LK_prevIs updated while AD_R <AD_ref And AD_R > AD_prevIf the result is not obtained, the search address AD of the proximity address register 42 is obtained._prevAnd link part 44 search part information LK_prevIs not updated and the value at the time of the previous update is held as it is.
[0135]
Therefore, when such an operation is executed in the memory data search circuit 35 in response to the read scan for all the part tables derived from the table pointer P-FRA, the forward of the reference free area is reached when the operation is completed. The end address of the segment that is the closest free area is the search address AD_prevThe parts table indicating the segment is stored as the search part information LK._prevWill be held as.
[0136]
When the read scan of the parts table from the table pointer P-FRA by the memory controller 12 is completed, the processing of the system controller 11 proceeds to step F105 in FIG. 4 and the search address AD held in the memory data search circuit 35_prevAnd search parts information LK_prevCapture. And search address AD_prevProximity free area address N₁ As search parts information LK_prevProximity free area parts information NL₁ Hold as.
[0137]
Subsequently, the system controller 11 again sends the address A as an initial value to the proximity address register 42 to the memory data search circuit 35 of the memory controller 12._MIN Search address AD_prevAnd the search part information LK in the link register 44_prevIs cleared (F106).
[0138]
When the system controller 11 sets the memory data search circuit 35 to the memory controller 12 in this way, the table controller P-TNO1 to the U-TOC held in the buffer RAM 13 is now set to the memory controller 12. Control is performed to sequentially execute the search for the parts table derived from each of the P-TNO 255 (F108). That is, the memory controller 12 performs a read scan of the parts table related to the segment (music area) where the music is recorded. Then, it waits until this read scan is completed (F109).
[0139]
In this read scan, the memory data search circuit 35 of the memory controller 12 searches for a segment that is the music area closest to the front with respect to the reference free area.
[0140]
That is, the memory controller 33 sequentially generates an address for the parts table derived from the table pointer P-TNO1 by the address counter 34, thereby targeting one or more segments of the first song via the RAM data interface unit 31. The data of the parts table that has been selected is taken in sequentially. Here, the data fetched from one parts table is a total of 8 bytes including a start address 3 bytes, an end address 3 bytes, track mode information 1 byte, and link information 1 byte.
[0141]
When the lead scan of the parts table for the first song is completed, the second song is followed by the parts table from the table pointer P-TNO2, the third song is followed by the parts table from the table pointer P-TNO3, and so on. The parts table corresponding to the segments for all the music pieces that have been read-scanned and thus recorded are sequentially read from the buffer RAM 13.
[0142]
When the memory data search circuit 35 fetches the data of these parts tables via the controller interface unit 33, the end address comparison processing of each segment and the holding of the previous link information are performed as in the case of the parts table related to the free area. In addition, according to the comparison result of the comparison units 45 and 46, AD_R > AD_prevAnd AD_R <AD_ref If this is the case, the read parts table is determined to be a parts table that indicates a segment of the music area that is located in front of and relatively close to the reference free area, and the proximity logic register 42 and the link are linked from the control logic 47. A latch control signal is output to the register 44. And address AD_R A new search address AD_prevAnd the search target part information LK latched in the temporary register 43_R Search part information LK in the link register 44_prevAs latch.
[0143]
Subsequently, the parts table is sequentially read, but each time the comparison operation by the comparison units 45 and 46 is executed, and as a result AD_R <AD_ref And AD_R > AD_prevIf so, the search address AD of the proximity address register 42_prevAnd link part 44 search part information LK_prevIs updated while AD_R <AD_ref And AD_R > AD_prevIf the result is not obtained, the search address AD of the proximity address register 42 is obtained._prevAnd link part 44 search part information LK_prevIs not updated and the value at the time of the previous update is held as it is.
[0144]
Accordingly, the memory data search circuit 35 performs such an operation because the table pointer P-TNO1 to P-TNO255 (however, there is no part table for the table pointer set to “00h” in P-TNO1 to P-TNO255). For example, if only three songs are recorded, the lead scan for the table pointers P-TNO4 to P-TNO255 is not necessary). Is completed, the end address of the segment that is the closest music area in front of the reference free area is the search address AD._prevThe parts table indicating the segment is stored as the search part information LK._prevWill be held as.
[0145]
When the read scan of the parts table from the table pointers P-TNO1 to P-TNO255 by the memory controller 12 is completed, the processing of the system controller 11 proceeds to step F109 in FIG. 4 and the search address held in the memory data search circuit 35 AD_prevAnd search parts information LK_prevCapture. And search address AD_prevNear music area address N₂ As search parts information LK_prevProximity music area parts information NL₂ Hold as.
[0146]
At this time, the system controller 11 has a proximity free area address N₁ And adjacent music area address N₂ Are compared (F110). From this comparison, it can be seen whether the free area is located in front of the reference free area or the music area is located.
[0147]
For example, when a music area exists immediately before the reference free area as shown in FIGS. 5A and 6, the proximity free area address N as shown in the figure.₁ Is address A_{twenty one}And the adjacent music area address N₂ Is address A_{twenty three}Is equivalent to N₁ <N₂ It becomes.
On the other hand, when a free area exists immediately before the reference free area as shown in FIGS. 7A and 8A, the adjacent free area address N as shown in FIG.₁ Is address A_{twenty three}And the adjacent music area address N₂ Is address A_{twenty one}Is equivalent to N₁ > N₂ It becomes.
[0148]
N in Step F110₁ <N₂ If the front is determined as the music area, the reference address N_ref To nearby music area address N₂ Thus, it is determined whether or not a trash area exists between the reference free area and the music area immediately before (F111).
[0149]
If adjacent music area address N₂ And reference address N_ref If the difference is one sound group, the reference free area and the music area immediately before it are completely adjacent to each other, and there is no trash area. That is, it is determined that the state shown in FIG.
In this case, since the merge process for the trash area is unnecessary, the forward merge process is terminated (F111 → YES).
[0150]
However, the adjacent music area address N₂ And reference address N_ref If the difference is greater than or equal to two sound groups, it is determined that there is a trash area between the reference free area and the music area immediately before it, that is, the state shown in FIG.
[0151]
In this case, merge processing for the trash area is executed (F111 → F112). That is, as shown in FIG. 5B, the start address of the reference free area is set to address A.₂₆To address A_{twenty four}Change to and hold. This address A_{twenty four}Is the adjacent music area address N₂ Calculated by calculation of +1. As a result, in the system controller 11, the reference free area is completely adjacent to the immediately preceding music area, and is understood as having no trash area.
[0152]
In step F110, N₁ > N₂ If the front is determined to be a free area, the merge process is executed without determining the presence or absence of a trash area (F110 → F113). That is, by combining the front free area and the reference free area, even if a trash area exists, it is automatically resolved.
[0153]
For example, as shown in FIG. 8A, when the reference free area and the immediately preceding free area are completely adjacent and no trash area exists, the start address A of the reference free area_{twenty four}To the start address A of the free area ahead_{twenty two}And address A as shown in FIG._{twenty two}~ A₂₇As a standard free area.
[0154]
The U-TOC rewrite editing is performed after the forward merging process and the backward merging process described later are completed. When the U-TOC is actually edited, the address A_{twenty two}The end address in the parts table where the free area segments from_{twenty three}To A₂₇The process to change to is performed. However, if the free area is further combined backward in the backward merge processing described later, the address A is accordingly changed._{twenty two}The end address of the parts table with the start address is rewritten to the end address of the free area behind it.
[0155]
Further, for example, even if a trash area exists between the reference free area and the immediately preceding free area as shown in FIG._{twenty four}To the start address A of the free area ahead_{twenty two}And address A as shown in FIG._{twenty two}~ A₂₇As a new reference free area, the trash area will automatically disappear.
[0156]
When the above forward merging process is completed, the system controller 11 executes the backward merging from the reference free address.
[0157]
The processing of the system controller 11 as the backward merging processing is as shown in FIG.
First, the system controller 11 sets the end address of the segment serving as the editing reference as the reference address N._ref Is set internally as (F201). For example, as shown in FIGS._{twenty four}~ A₂₇Segment or A_{twenty four}~ A₂₉If the segment is a reference free area (shaded area) after the forward merge process described above, the end address A of this reference free area₂₇(A in the case of FIG. 11₂₉) Is the reference address N_ref Set as
[0158]
10 to 13 show various cases behind the reference free area, and FIG. 10A shows a segment where music is recorded via the trash area behind the reference free area. 11, FIG. 11 shows a case where there is a segment in which music is recorded immediately behind the reference free area and there is no trash area. FIG. 12A shows the free area via the trash area behind the reference free area. When there is an area segment, FIG. 13A shows a case where there is a free area segment immediately after the reference free area and there is no trash area. The process determines whether the current state corresponds to this state, and performs a merge process accordingly.
[0159]
Reference address N_ref Then, the system controller 11 causes the memory controller 12 to execute the backward search mode. In other words, the memory controller 12 is made to determine whether the rear adjacent position of the reference free area is in the state of FIG. 10A, FIG. 11, FIG. 12A, or FIG. 13A (F202).
[0160]
For this purpose, the reference address N is stored in the reference address register 41 of the memory data search circuit 35 via the controller interface unit 33 of the memory controller 12._ref As well as a latch control command and a reference address N_ref To the reference address register 41_ref Let me hold as. In other words, this reference address is the end address of the reference free area, contrary to the start address of the reference free area in the case of the forward merge process.
[0161]
Similarly, the address A is used as an initial value for the proximity address register 42._MAX And latch it. Address A_MAX Is the address of the last position of the recordable user area as shown in FIG._A Is the previous address.
Furthermore, the search part information LK in the link register 44_prevTo clear.
[0162]
Further, the search mode signal S_SMIs output to the output selection unit 40 and the control logic 47. Search mode signal S in this case_SMIs a signal for identifying whether the memory data search circuit 35 executes the forward merging process or the backward merging process as described above, and the search mode signal S indicating the backward merging process._SMIs supplied, the output selection unit 40 uses the start address of the part table address data in the read U-TOC as the search target address AD._R Is set to output as
[0163]
Further, the search mode signal S indicating the backward merging process._SMThus, the control logic 47 uses the reference address AD in the comparison unit 45._ref And search target address AD_R By comparing AD_R > AD_ref And the search address AD in the comparison unit 46 is obtained._prevAnd search target address AD_R Comparison of AD_prev> AD_R Is obtained, a latch control signal is output to the proximity address register 42 and the link register 44, and the search address AD is output._prevAnd search parts information LK_prevSet to cause updates to be performed.
[0164]
When the system controller 11 turns on the backward search mode for the memory controller 12 in this way, the U-TOC held in the buffer RAM 13 is first searched for the part table derived from the table pointer P-FRA. Control to execute (F203). That is, the memory controller 12 is caused to execute a read scan of the parts table relating to the free area. Then, it waits until this read scan is completed (F204).
[0165]
In this read scan, the memory data search circuit 35 of the memory controller 12 searches for a segment that is the closest free area to the rear of the reference free area.
That is, the memory controller 33 sequentially generates an address for the part table derived from the table pointer P-FRA by the address counter 34, whereby the data of the part table for the free area is sequentially transmitted via the RAM data interface unit 31. It is captured. That is, as in the case of the forward merging process, all 8-byte data including a start address of 3 bytes, an end address of 3 bytes, track mode information of 1 byte, and link information of 1 byte are fetched from one part table.
[0166]
When the memory data search circuit 35 fetches these data via the controller interface unit 33, first, link information is fetched into the temporary register 43.
[0167]
However, at the start of this read scan, the table pointer P-FRA is taken into the temporary register 43, and when the first parts table is read, the temporary register 43 stores the table pointer P-FRA as the previous link information. The value of the table pointer P-FRA and the link information fetched this time are respectively held by the two-stage register configuration. At this time, the temporary register 43 sets the value of the table pointer P-FRA to the search target part information LK._R Will hold as.
[0168]
Further, the start address recorded in the parts table from the output selection unit 40 is the search target address AD._R Is output as
Then, in the comparison unit 45, the reference address AD_ref (In this case, address A₂₇) And search target address AD_R (The start address of the parts table) is compared.
Where AD_R > AD_ref If it is, it means that the read part table is a part table for a segment located behind the reference free area, and conversely AD_R <AD_ref If it is, it means that the read part table is a part table for a segment located in front of the reference free area.
[0169]
The comparison unit 46 also searches the search address AD._prev(In this case, the first address A is the initial value._MAX ) And search target address AD_R (Start address of the read parts table) is compared.
[0170]
Where AD_R > AD_prevThe read parts table is the search address AD_prevIs the segment behind the segment whose start address is shown in_R <AD_prevIf this is the case, the read parts table is the search address AD_prevThis is a segment behind the segment indicated by the start address.
However, the search address AD is still_prevFor parts tables that have been read at the time when has not been updated, the search address AD to be compared_prevIs the initial value A_MAX Because it is said that it is always AD_R <AD_prevIt becomes.
[0171]
Here, the comparison unit 45 performs AD_R > AD_ref (Search address AD_prevIs the initial value A_MAX In the case of_R <AD_prevAs a result, the read part table is determined to be a part table indicating a segment of the free area that is located behind and relatively close to the reference free area, and the control logic 47 detects the proximity address register 42. And a latch control signal is output to the link register 44, and the address AD_R A new search address AD_prevAnd the search target part information LK latched in the temporary register 43_R Search part information LK in the link register 44_prevAs latch.
[0172]
Search target part information LK in the temporary register 43_R That is, since it is link information in the part table read last time (in this case, it may be the value of the table pointer P-FRA), the search address AD in the proximity address register 42 is thus obtained._prevIs updated at the same time as the updated AD_prevThe position information of the parts table in which the end address that is the value of is stored in the link register 44 is searched part information LK_prevWill be held as.
[0173]
As a result, the start address of the segment behind the reference free area becomes the search address AD._prevAnd the position of the parts table indicating the segment is the search link information LK_prevAs shown.
[0174]
Subsequently, the part table linked from the part table is read according to the read scan, and the link information in this part table is taken into the temporary register 43. At this time, the search target part information LK in the temporary register 43_R Is the link information fetched last time, that is, search target part information LK_R The position on the U-TOC of the part table fetched this time is indicated.
Further, the start address of the parts table is retrieved from the output selection unit 40 by the search target address AD._R Is output as
[0175]
At this time, the search target address AD_R And reference address AD_ref Are compared by the comparison unit 45, and further the search target address AD_R And search address AD_prevAre compared by the comparison unit 46, and as a result, AD_R > AD_ref And AD_R <AD_prevIf so, the read-out parts table has a start address at that time as a search address AD._prevThis is a part table for a segment located closer to the rear side with respect to the reference free area than the part table held as.
[0176]
Therefore, the control logic 47 causes the proximity address register 42 and the link register 44 to execute latch, and the search address AD._prevIs updated to be the start address in the read parts table, and the search part information LK_prevLink information indicating the position of the read parts table, that is, the search target part information LK in the temporary register 43 at this time_R It is updated to the value held as.
[0177]
Subsequently, the linked parts table is sequentially read, and each time the comparison operation by the comparison units 45 and 46 is executed, and as a result AD_R > AD_ref And AD_R <AD_prevIf so, the search address AD of the proximity address register 42_prevAnd link part 44 search part information LK_prevIs updated while AD_R > AD_ref And AD_R <AD_prevIf the result is not obtained, the search address AD of the proximity address register 42 is obtained._prevAnd link part 44 search part information LK_prevIs not updated and the value at the time of the previous update is held as it is.
[0178]
Therefore, when such an operation is executed in the memory data search circuit 35 in response to the read scan for all the parts tables derived from the table pointer P-FRA, the process is completed after the reference free area. The start address of the segment that is the closest free area is the search address AD_prevThe parts table indicating the segment is stored as the search part information LK._prevWill be held as.
[0179]
When the read scan of the parts table from the table pointer P-FRA by the memory controller 12 is completed, the processing of the system controller 11 proceeds to step F205 in FIG. 9 and the search address AD held in the memory data search circuit 35_prevAnd search parts information LK_prevCapture. And search address AD_prevProximity free area address N₁ As search parts information LK_prevProximity free area parts information NL₁ Hold as.
[0180]
Subsequently, the system controller 11 again sends the address A as an initial value to the proximity address register 42 to the memory data search circuit 35 of the memory controller 12._MAX Search address AD_prevAnd the search part information LK in the link register 44_prevIs cleared (F206).
[0181]
When the system controller 11 sets the memory data search circuit 35 to the memory controller 12 in this way, the table controller P-TNO1 to the U-TOC held in the buffer RAM 13 is now set to the memory controller 12. Control is performed so that the search for the parts table derived from each P-TNO 255 is executed sequentially (F208). That is, the memory controller 12 performs a read scan of the parts table related to the segment (music area) where the music is recorded. Then, it waits until this read scan is completed (F209).
[0182]
In this read scan, the memory data search circuit 35 of the memory controller 12 searches for the segment that is the music area closest to the back with respect to the reference free area.
That is, the memory controller 33 sequentially generates an address for the parts table derived from the table pointer P-TNO1 by the address counter 34, thereby targeting one or more segments of the first song via the RAM data interface unit 31. The data of the parts table that has been selected is taken in sequentially. Here, the data fetched from one parts table is a total of 8 bytes including a start address 3 bytes, an end address 3 bytes, track mode information 1 byte, and link information 1 byte.
[0183]
When the lead scan of the parts table for the first song is completed, the second song is followed by the parts table from the table pointer P-TNO2, the third song is followed by the parts table from the table pointer P-TNO3, and so on. The parts table corresponding to the segments for all the music pieces that have been read-scanned and thus recorded are sequentially read from the buffer RAM 13.
[0184]
When the memory data search circuit 35 takes in the data of these parts tables via the controller interface unit 33, the start address comparison processing of each segment and the holding of the previous link information are performed as in the case of the parts table related to the free area. In addition, according to the comparison result of the comparison units 45 and 46, AD_R <AD_prevAnd AD_R > AD_ref If this is the case, the read parts table is determined to be a part table indicating a segment of the music area located behind and relatively close to the reference free area, and the proximity address register 42 and the link from the control logic 47 are determined. A latch control signal is output to the register 44. And address AD_R A new search address AD_prevAnd the search target part information LK latched in the temporary register 43_R Search part information LK in the link register 44_prevAs latch.
[0185]
Subsequently, the parts table is sequentially read, but each time the comparison operation by the comparison units 45 and 46 is executed, and as a result AD_R > AD_ref And AD_R <AD_prevIf so, the search address AD of the proximity address register 42_prevAnd link part 44 search part information LK_prevIs updated while AD_R > AD_ref And AD_R <AD_prevIf the result is not obtained, the search address AD of the proximity address register 42 is obtained._prevAnd link part 44 search part information LK_prevIs not updated and the value at the time of the previous update is held as it is.
[0186]
Accordingly, the memory data search circuit 35 performs such an operation on the table pointers P-TNO1 to P-TNO255 (of course, in this case as well, for the table pointer that is set to “00h” among the P-TNO1 to P-TNO255, the parts table is When it is executed according to the lead scan for all the parts tables derived from (there is no existence, the lead scan is unnecessary), the music area closest to the reference free area is The start address of the segment is the search address AD_prevThe parts table indicating the segment is stored as the search part information LK._prevWill be held as.
[0187]
When the read scan of the parts table from the table pointers P-TNO1 to P-TNO255 by the memory controller 12 is completed, the processing of the system controller 11 proceeds to step F209 in FIG. 4 and the search address held in the memory data search circuit 35 AD_prevAnd search parts information LK_prevCapture. And search address AD_prevNear music area address N₂ As search parts information LK_prevProximity music area parts information NL₂ Hold as.
[0188]
At this time, the system controller 11 has a proximity free area address N₁ And adjacent music area address N₂ Are compared (F210). From this comparison, it can be seen whether there is a free area or a music area after the reference free area.
[0189]
For example, when the music area exists after the reference free area as shown in FIGS. 10A and 11, the proximity free area address N as shown in the figure.₁ Is address A₃₂And the adjacent music area address N₂ Is address A₃₀Is equivalent to N₁ > N₂ It becomes.
On the other hand, when there is a free area after the reference free area as shown in FIGS. 12A and 13A, the proximity free area address N as shown in FIG.₁ Is address A₃₀Or A₂₈And the adjacent music area address N₂ Is address A₃₂Is equivalent to N₁ <N₂ It becomes.
[0190]
N in Step F220₁ > N₂ If the back is determined to be the music area, the adjacent music area address N₂ To reference address N_ref Thus, it is determined whether or not a trash area exists between the reference free area and the subsequent music area (F211).
[0191]
If adjacent music area address N₂ And reference address N_ref If the difference is one sound group, that is, the reference free area and the subsequent music area are completely adjacent to each other, and there is no trash area. That is, it is determined that the state shown in FIG.
In this case, the merge process for the trash area is unnecessary, and the backward merge process is terminated (F211 → YES).
[0192]
However, the adjacent music area address N₂ And reference address N_ref If the difference is greater than or equal to two sound groups, it is determined that there is a trash area between the reference free area and the subsequent music area, that is, the state shown in FIG.
[0193]
In this case, merge processing for the trash area is executed (F211 → F212). That is, as shown in FIG. 10B, the end address of the reference free area is set to address A.₂₇To address A₂₉Change to and hold. This address A₂₉Is the adjacent music area address N₂ Calculated by calculation of -1. As a result, in the system controller 11, the reference free area is completely adjacent to the subsequent music area, and the trash area is eliminated.
[0194]
In step F220, N₁ <N₂ If the rear is determined as a free area, the merge process is executed without determining the presence or absence of a trash area (F220 → F213). That is, by combining the rear free area and the reference free area, even if a trash area exists, it is automatically resolved.
[0195]
For example, as shown in FIG. 13A, when the reference free area and the subsequent free area are completely adjacent and there is no trash area, the end address A of the reference free area₂₇To the end address A of the free area behind₃₁And address A as shown in FIG._{twenty four}~ A₃₁As a standard free area.
[0196]
Although only the backward merging process is described here, of course, in the above-described forward merging process, when the reference free area is combined with the front free area as shown in FIGS. The start address of the reference free area is the start address of the free area in front of it.
When the U-TOC is actually edited after the merge processing, the reference free area newly grasped in the merge processing corresponds to the segment of the free area forward or backward until then. It will be contained and expressed in the provided parts table.
[0197]
Further, for example, even if a trash area exists between the reference free area and the subsequent free area as shown in FIG.₂₇To the end address A of the free area behind₃₁And address A as shown in FIG._{twenty four}~ A₃₁As a new reference free area, the trash area will automatically disappear.
[0198]
When the forward merging process and the backward merging process are completed as described above, the system controller 11 executes the U-TOC editing operation based on the merging process and rewrites the U-TOC in the buffer RAM 13.
For example, in the example of FIG. 20, the U-TOC of FIG. 21 is edited and rewritten as shown in FIG. At a predetermined time, the edited U-TOC is supplied to the disk 1 as recording data, and the U-TOC is rewritten on the disk 1.
[0199]
By performing merge processing as described above and performing U-TOC editing, the trash area is eliminated, and the recordable user area of the disc 1 can be used effectively.
[0200]
Then, the memory controller having a memory data search circuit on the memory controller 12 side as in this embodiment executes these processes, so that the system controller 11 can read the part table to be read-scanned during the merge process. The operation of receiving adjacent data and determining the adjacent segments by comparing the data becomes unnecessary. Therefore, the time required for communication of read scan data between the system controller 11 and the memory controller 12 is completely eliminated. Therefore, a quick merge process is realized. For example, the U-TOC editing processing time, which conventionally takes about 2 minutes, can be shortened to about 2 seconds.
[0201]
Further, the system controller 11 sends a search mode signal S to the output selection unit 40 in the memory data search circuit 35._SMThe end address is output during forward merge processing and the start address is output during backward merge processing. By doing so, the search address can be used as it is for the determination of the presence or absence of the trash area, so that the efficiency of the process is also promoted.
[0202]
By the way, in the above embodiment, the forward merge process is executed first. However, the backward merge process may be executed first, or the forward merge process and the backward merge process are executed simultaneously. Time can also be shortened. However, in order to execute the forward merging process and the backward merging process at the same time, it is necessary to provide two units of the memory data search circuit 35 for the forward search and the backward search in the memory controller 12.
[0203]
The output selection unit 40 and the control logic 47 in the memory data search circuit 35 are connected to the search mode signal S._SMTo determine the operation at the time of the forward merge process and the operation at the time of the backward merge process. In particular, as described above, the operation of the output selection unit 40 is the end address during the forward merge process, and the start address during the backward merge process. However, these are not always necessary.
[0204]
That is, the output selection unit 40 outputs the end address during the forward merging process, but this may be the start address. In other words, the same result can be obtained even if the comparison is made with the start address, only for the purpose of seeking a segment located in front of the reference free area and determining whether the segment is a music area or a free area. . In this case, the system controller 11 determines whether or not there is a trash area between the searched forward segment and the reference free area. The system controller 11 uses the search part information LK fetched from the link register 44._prev, Proximity free area parts information NL₁ Or nearby music area parts information NL₂ Therefore, the end address of the segment in front of it can be obtained by reading the part table shown. Therefore, the reference address N_ref And the end address of the preceding segment can be compared to determine whether or not a trash area exists.
[0205]
For the same reason, the output selection unit 40 may be an end address instead of a start address during the backward merge process.
That is, depending on the processing method, the operation of the output selection unit 40 is changed to the search mode signal S._SMIt is not always necessary to operate according to the above.
[0206]
The search mode signal S is similarly applied to the control logic._SMTherefore, it is not necessary to distinguish and operate.
In other words, the proximity address register 42 appropriately sets A as the initial value when the forward merge process starts._MIN Is set, and A is properly set as the initial value at the start of backward merge processing._MAX Is set, the control logic 47 sets the AD_prev<AD_R <AD_ref (That is, the latch condition at the time of forward merge processing) or AD_prev> AD_R > AD_ref If the latch control signal is output when one of the conditions (that is, the latch condition at the time of the backward merge process) is satisfied, the above-described search for the front and rear segments is realized.
[0207]
Incidentally, in the embodiment, the search part information LK is obtained from the link register 44 as the position information of the part table of the segment adjacent to the front or rear._prevHowever, this is not always necessary for the merge process of the above embodiment. That is, the temporary register 43 and the link register 44 may not be provided as the memory data search circuit 35.
[0208]
However, in actual merge processing (steps F112, F113, F212, F213) and U-TOC editing processing, the position information of the parts table for this adjacent segment is obtained by the memory data search circuit 35. Therefore, the processing can be executed efficiently.
Needless to say, the merge process is not limited to the time of erasure.
[0209]
In the above embodiment, the memory control device and the memory data search circuit are applied to the recording / reproducing device for the magneto-optical disk 1. However, the memory control device and the memory data search circuit are applied to the recording-only device and other devices. it can.
[0210]
【The invention's effect】
As described above, according to the present invention, the management information corresponding to the segment located before or after the segment on the recording medium which is the reference of the editing operation by performing the search and comparison processing of the management information (U-TOC) in the memory controller. By providing a memory data search circuit that executes an operation for discriminating the data, the data to be searched (that is, the data of the part table in the U-TOC) itself does not need to be communicated to the system controller. The time required for data communication can be eliminated, and the processing time can be significantly shortened.
[0211]
In addition, since the system controller does not need to search for adjacent segments by data comparison, there is an advantage that the processing load on the system controller is greatly reduced.
[0212]
Further, the system controller 11 sends a search mode signal S to the output selection unit 40 in the memory data search circuit 35._SMThe end address is output during forward merge processing and the start address is output during backward merge processing. By doing so, the search address can be used as it is for the determination of the presence or absence of the trash area, so that the efficiency of the process is also promoted.
[0213]
In addition, when the system controller causes the memory data search circuit to perform a search, when searching for management information corresponding to a segment positioned in front of the reference segment, the system controller sets the end address of each segment in the management information. On the other hand, when searching for management information corresponding to a segment located at the back, control is performed so that the start address of each segment in the management information is searched, so that the search address can be used as it is to determine whether there is a trash area. It can be used, and there is an effect that efficiency of processing is promoted.
[0214]
Further, as described above as the memory data search circuit, the reference data register means, the output selection means, the search data register means, the search object data position register means, the search data position register means, the first comparison means, and the second comparison By comprising the means and the update control means, there is an effect that it is possible to accurately search the segment located before or after the lead scan period and the position of the part table of the segment.
[Brief description of the drawings]
FIG. 1 is a block diagram of a recording / reproducing apparatus including a memory control device and a memory data search circuit according to an embodiment of the present invention.
FIG. 2 is a block diagram of a memory control device and a peripheral circuit unit according to the embodiment.
FIG. 3 is a block diagram of a memory data search circuit and a peripheral circuit unit according to the embodiment.
FIG. 4 is a flowchart of forward merge processing by the memory control device according to the embodiment.
FIG. 5 is an explanatory diagram of a forward merge process.
FIG. 6 is an explanatory diagram of a forward merge process.
FIG. 7 is an explanatory diagram of a forward merge process.
FIG. 8 is an explanatory diagram of a forward merge process.
FIG. 9 is a flowchart of backward merge processing by the memory control device according to the embodiment.
FIG. 10 is an explanatory diagram of a backward merge process.
FIG. 11 is an explanatory diagram of a backward merge process.
FIG. 12 is an explanatory diagram of a backward merge process.
FIG. 13 is an explanatory diagram of a backward merge process.
FIG. 14 is an explanatory diagram of P-TOC information of a disc.
FIG. 15 is an explanatory diagram of U-TOC information of a disc.
FIG. 16 is an explanatory diagram of a management form of U-TOC information of a disc.
FIG. 17 is an explanatory diagram of an address data format of P-TOC and U-TOC information of a disc.
FIG. 18 is an explanatory diagram of a disc that can be segmented and recorded.
FIG. 19 is an explanatory diagram of a track format of a disc.
FIG. 20 is an explanatory diagram of an area state of a disc.
FIG. 21 is an explanatory diagram of a management state of recording data of a disc.
FIG. 22 is an explanatory diagram of processing involved in erasing recorded data on a disc.
FIG. 23 is an explanatory diagram of processing associated with erasure of recorded data on a disc.
FIG. 24 is an explanatory diagram of U-TOC editing processing that accompanies erasure of recorded data on a disc.
[Explanation of symbols]
1 disc
3 Optical head
8 Encoder / Decoder part
11 System controller
12 Memory controller
13 Buffer RAM
14 Encoder / Decoder part
30 Disk drive interface section
31 RAM data interface
32 Voice compression interface
33 Controller interface
34 Address counter
35 Memory data search circuit
40 Output selector
41 Reference address register
42 Proximity address register
43 Temporal Register
44 Link register
45, 46 comparison part
47 Control logic

Claims (4)

Management data for recording the recording data area where the recording data is recorded, the unrecorded area where the recording data is not recorded, and the start position and end position of each of the recording data area and the unrecorded area are recorded. A search circuit for searching for a useless area that is not managed by the management data adjacent to a predetermined unrecorded area from a recording medium on which the record data can be recorded discretely.
A memory for storing and managing the management information recorded on the recording medium;
Reference data register means for holding the position of the predetermined unrecorded area as a search reference;
Output selection means for extracting and outputting search target data from data read from the memory by a search operation;
Search data register means capable of holding search target data output from the output selection means as search data;
Search object data position register means for holding position information of the search object data based on the search object data output from the output selection means;
First comparison means for comparing the reference data held in the reference data register means and search target data output from the output selection means;
Second comparison means for comparing the search data held in the search data register means with the search target data output from the output selection means;
Based on the comparison result of the first and second comparison means, search object data output from the output selection means for updating the search data of the search data register means is held in the search data register means, Update control that permits the search object data position information held in the search object data position register means to be held in the search data position register means in order to update the search position information of the search data position register means And a search circuit. The update control means includes
In the case of a search for a waste area located in front of the predetermined unrecorded area, the search data register means is controlled to hold the end position of the search target data,
The search data register means controls the search data register means to hold the start position of the search target data when searching for a useless area located behind the predetermined unrecorded area. Search circuit. In the case of searching for a useless area located in front of the predetermined unrecorded area, the first comparison means determines whether the end position provided in the search target data output from the output means is before the search reference. And the second comparison unit compares whether the search data held in the search data register is before the end position included in the search target data output from the output selection unit, In the case of searching for a useless area located behind the predetermined unrecorded area, the first comparison means determines whether the end position provided in the search target data output from the output means is after the search reference. And the second comparison means is arranged so that the search data held in the search data register is after the end position included in the search target data output from the output selection means. Searching circuit according to claim 1, wherein the comparing whether. Management data for recording the recording data area in which the recording data is recorded, the unrecorded area in which the recording data is not recorded, and the start position and end position of each of the recording data area and the unrecorded area are recorded. A recording / reproducing apparatus that searches for a useless area that is not managed by the management data adjacent to a predetermined unrecorded area from a recording medium on which the recorded data can be discretely recorded.
Reproducing means for reproducing the management data recorded in the management data recording area from the recording medium;
A memory for managing and storing management information recorded on the recording medium reproduced by the reproducing means;
Reference data register means for holding the position of the predetermined unrecorded area as a search reference;
Output selection means for extracting and outputting search target data from data read from the memory by a search operation;
Search data register means capable of holding search target data output from the output selection means as search data;
Search object data position register means for holding position information of the search object data based on the search object data output from the output selection means;
First comparison means for comparing the reference data held in the reference data register means and search target data output from the output selection means;
Second comparison means for comparing the search data held in the search data register means with the search target data output from the output selection means;
Based on the comparison result of the first and second comparison means, search object data output from the output selection means for updating the search data of the search data register means is held in the search data register means, Update control that permits the search object data position information held in the search object data position register means to be held in the search data position register means in order to update the search position information of the search data position register means Means,
Based on the search data held in the search data register, the memory is arranged to merge the useless areas adjacent to the specified empty area searched for in the predetermined empty area so as to erase the searched useless area. Control means for editing the stored management information;
A recording / reproducing apparatus comprising recording means for rewriting the edited management information stored in the memory in the management data recording area of the recording medium.

Images