JPH10293989A - Minidisk device and minidisk editing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain data backup for editing work for a small storage area so as to realize cancellation (undo) or reexecution (redo) of editing work by rewriting auxiliary data stored in a first storing means based on the data of a pointer area stored in a second storing means for canceling or reexecuting editing. SOLUTION: A minidisk 100 for recording is set, and the data in a user TOC (UTOC) area are written in the area A of an RAM 117. The pointer data and slot data of a sector 0 and the pointer data of sectors 1, 2 and 4 are written in an area B. By an editing operation, a CPU 107 operates the data of the UTOC area of the RAM 117 by an RAM control circuit 118. For undoing or redoing editing work, the CPU 107 rewrites the data of the UOC area in the area A based on, among the data of the sectors stored in the area B of the RAM 117, the data of the sector related to undoing or redoing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cancel (undo) / re-execute (redo) process in an editing operation of a mini disc device.

[0002]

2. Description of the Related Art A high efficiency compression encoding process is applied to digital audio data such as a music signal, and a mini disk (MD: Mi) is used as a recording medium for recording the compressed digital data.
ni Disk) is widespread. ATRAC (Adaptive Transform Acoustic Coding), which is a high-efficiency compression encoding process that combines band division and orthogonal transformation and applies high auditory masking effects to achieve high compression efficiency
An audio compression technique of the system is used.

[0003] In the compression processing in the ATRAC system, digital audio data is divided into unit blocks of a certain size (for example, blocks containing 512-point data), and these unit blocks are used as compression unit blocks. MDC
Apply T (Modified Discrete Cosine Transform) to obtain spectral coefficient data (frequency component data) on the frequency axis
Convert and compress. Furthermore, the converted spectral coefficient data reflects the minimum audibility characteristic and masking effect based on the auditory analysis, and compresses the information amount of 2,048 bytes of 512 samples of two channels to 424 bytes, which is about ５ of the information amount before compression. The recorded data (sound group) is recorded on a recording medium.

[0004] The sound group includes audio spectrum data (spectrum data) as spectral coefficient data, a scale factor of each transmission divided band,
It consists of sound parameters that are auxiliary data such as word length (word length). The word length (word length) is the number of bits obtained by requantizing the spectral coefficient. The scale factor is the maximum spectral level of the transmission division band. Is an approximation of

[0005] The compressed digital audio data is
By performing a decompression process that is the reverse of the above-described compression process, uncompressed digital audio data is obtained. That is, spectrum coefficient data is obtained from the sound group read from the mini-disc, and the spectrum coefficient data is added to the IMDCT (Inverse Modified Discr
Ete Cosine Transform) is performed to convert the data into data on the time axis, and the converted data is subjected to block concatenation and filter synthesis to obtain uncompressed digital audio data.

FIG. 8 is a schematic diagram showing a schematic configuration of a conventional mini disk device. A mini-disc device for recording and reproducing the mini-disc 801 converts an analog / digital (A / D: Analog / Digital) converter 802 for converting an input analog audio signal into digital audio data.
And digital / analog (D / A: Digital / A) for converting digital audio data into an analog audio signal.
nalog) converter 803, ATRAC section 804, shock proof memory 805, shock proof memory controller 806, EFM (Eight to Fourteen Mo
dulation) encoder / decoder unit 807, a digital audio interface (DAI: Digital Audi) equipped with an external transmission output function and an external reception input function
o) 808 and a controller (CPU: Central Processing Unit) 809 for performing overall control.

A shock-proof memory 805 is a digital audio system using a mini disc 801.
For example, the shock proof memory controller 806 is provided as a buffer for preventing the sound from being interrupted due to vibration when used outdoors (such as interruption of sound due to mechanical vibration of the optical pickup on the mini disc 801). The buffering of the spectrum coefficient data to the proof memory 805 is controlled.

The EFM encoder / decoder 80
Numeral 7 is provided for generating a recording signal for the mini-disc 801. For this modulation method, EFM which is a modulation method of a compact disk (CD) is used as it is. Also, the correction code is an ACIRC (Advanced Cross Indication) obtained by returning the interleave of the Cross Interleave Reed-Solomon Code (CIRC) in the CD.
terleave Reed-Solomon Code) is used.

The recording (recording) and reproducing operations of the above-mentioned mini disk device will be described. During a recording operation, when an audio input of an analog audio signal is input to the A / D converter 802 via, for example, a microphone (not shown), the A / D converter 802 converts the audio input into digital audio data, It is given to the ATRAC unit 804. The ATRAC unit 804 converts and compresses the digital audio data into a sound group by the encoding function. The sound group output from the ATRAC unit 804 is stored in the shock proof memory controller 806 (the shock proof memory 80).
5), via the EFM encoder / decoder unit 807,
It is recorded (recorded) on the mini disc 801.

At the time of a reproducing operation, data (sound group) recorded (recorded) on the mini-disc 801 is read by an optical pickup (not shown), and an EFM encoder / decoder 807 and a shock-proof memory controller 806 (shock proof memory controller) are read. It is given to the ATRAC unit 804 via the proof memory 805). A
The TRAC unit 804 expands and reproduces data from the mini disc 801 to digital audio data by using the decoding function. Thus, the ATRAC unit 804
Is applied to a D / A converter 803, is converted into an analog audio signal by the D / A converter 803, and is reproduced and output as an audio output from, for example, a speaker (not shown).

There are two types of mini-discs 801: a read-only MD (pre-mastered MD) and a recordable MD (recordable MD). In a read-only MD, as described above, EF
M, CIRC or ACIRC is adopted as an error correction code, and the format is very close to the "mode 2" standard of a CD-ROM in which compressed audio data is collectively recorded for each block.

FIG. 9 is a diagram for explaining a signal recording format of a recordable MD. In a recordable MD, to record data using the CIRC error correction code, 108 frames (1
A link area (link sector) equal to or more than (sector + α), that is, a “discard area” must be prepared. In addition, even after the data has been recorded, it is necessary to secure an area of 108 frames or more in order to complete the interleaving of the error correction. If it is attempted to start recording data on the recordable MD from an arbitrary location, the link areas are scattered around the disc, and the use efficiency of the data deteriorates. Therefore, data is recorded for each large group to some extent. Therefore, the data is collectively recorded in a recording unit of one cluster including 36 sectors. Rewriting is always performed at an integral multiple of one cluster, and data to be recorded is temporarily stored in a RAM and written to a disk.

That is, in a recordable MD, in one cluster (= 36 sectors), the first three sectors are used as a link area (link sector), the next one sector is used for sub data, and the remaining 32 sectors are used for compressed data. When recording data, recording is started from the middle of the second link sector of the three-sector link sector, and when writing the 36th sector is completed,
Data for error correction is written halfway between the first link sector and the second link sector of the next cluster.

FIG. 10 is a schematic diagram showing an example of the structure of recording data of a recordable MD. For example, in a recordable MD,
As shown in FIG. 10, a lead-in area is provided in a predetermined area on the inner circumference, and a lead-out area is provided on the outermost circumference, and a standard area is provided between the lead-in area and the lead-out area. Data (standard compressed data (ATRA
C data)) A storage area, that is, an area in which a user can record predetermined data is provided. On the innermost side of the standard data recording area, a management area in which management information for standard data is recorded, ie, A user TOC (UTOC) area is provided, in which TOC data required by the user can be recorded at any time. In addition,
In the case of a normal mini-disc, the address of the recorded music number and the like are recorded in the UTOC area.

More specifically, predetermined contents are recorded in the UTOC area by repeating three clusters. The contents recorded in the UTOC area include address information of each data track in which sector 0 is compressed by ATRAC, sector 1
Is the name of each track (song name) in alphabet (ASCII code), sector 2 is the recording date and time of each track,
The sector 4 has a track name (song name) according to ISO-8859-1 or shift JIS. In a recordable MD, management information (standard data (compressed data)) for standard data (compressed data) at the time of recording is used. Is recorded in the sector 0, and at the time of reproduction, data search and reproduction are performed based on this management information (address information).

In addition, in the editing work of digital audio data recorded on a mini-disc in a mini-disc device, the editing operation can be easily performed only by rewriting the above-mentioned UTOC pointer or address data without changing the digital audio data itself. Can be. Standard editing tasks include erasing (ERA)
SE), division from the specified location into two (DIV)
IDE), combining two continuous songs into a single song (COMBINE), and moving a designated song to a designated location to change the song order (MOVE).

[0017]

In the above-mentioned editing operation, if the user does not like the completed editing and wants to start over again, make a backup of the data in the UTOC area, and cancel the editing operation using the backup data ( Undo) or re-execution (redo) can be performed.

However, when undoing is performed in the above-mentioned editing work, a memory area having the same size as each of the sectors 0, 1, 2, and 4 in the UTOC area is required for the number of sectors. In addition, since the redo in the editing operation described above cannot be executed unless undo is performed at least once, when performing redo, a memory area having the same size as each of the sectors 0, 1, 2, and 4 in the UTOC area is used. At least two or more are required, and the number of undo or redo operations is determined by the number of memories.

Normally, at the start of reproduction, data in the UTOC area and data for the shockproof function are stored in one direct random access memory (DRAM: Dire).
ct Random Access Memory). In other words, a part of one DRAM area is designated as an area for storing a UTOC area, and the other area is used as a shockproof memory. This DRAM
If you specify the area for backup of the UTOC area and use it, the DR for shockproof function
There is a disadvantage that the amount of data that can be stored by the AM is reduced, and the shock proof function is reduced.

Also, in order to keep a backup,
If a memory is additionally provided in addition to the above-described DRAM, a process of exchanging data between the memories increases, so that there is a disadvantage that a load is imposed on a CPU or the like. Further, when undoing or redoing is performed a plurality of times, it is necessary to increase the number of memories or double the memory size or the like.

An object of the present invention is to provide a mini-disc apparatus and a mini-disc editing method which can cancel (undo) and redo (redo) editing with a minimum memory area.

[0022]

According to the first aspect of the present invention, recording data representing an audio signal by subjecting the audio signal to a compression encoding process, and the address, track name, recording date and time of the recording data are shown. A mini-disc device for recording and reproducing a mini-disc capable of recording digital audio data comprising auxiliary data having data in a pointer area consisting of slot data and pointer data indicating the position of the slot data, comprising: Storage means for storing the auxiliary data of the digital audio data read out of the first storage means, and the auxiliary data stored in the first storage means are changed in accordance with the execution of the editing processing of erasing, moving, dividing and combining the recorded data. A second storage unit for storing data of the pointer area; It can, is characterized by comprising a control means for controlling rewriting the auxiliary data stored in the first storage means based on the data of the stored pointer region in the second storage means.

According to a second aspect of the present invention, there is provided recording data representing an audio signal by subjecting the audio signal to compression encoding, slot data indicating the address, track name, recording date and time of the recording data, and slot data. In a mini-disk editing method for editing recording data of a mini-disk capable of recording digital audio data including auxiliary data having pointer data consisting of pointer data indicating the position of The auxiliary data of the digital audio data is stored, and the data in the pointer area of the auxiliary data that is changed in accordance with the execution of the editing process of erasing, moving, dividing, and combining recorded data is stored, and the editing process is canceled or re-edited. The complement stored based on the pointer area data stored at the time of execution It is characterized by rewriting the data.

According to the present invention, when playing back a mini-disc on which digital audio data including recording data and auxiliary data is recorded, the auxiliary data of the mini-disc is stored in the first storage means. Also, the data in the pointer area of the auxiliary data (sectors 0, 1, 2, and 4 in the UTOC area) that is changed when the editing operation (deletion, movement, division, and combination of the recording data) of the minidisk is performed is stored in the second area. Store in storage means. When the editing work is canceled or re-executed, the editing work is canceled by rewriting the auxiliary data stored in the first storage means based on the data in the pointer area stored in the second storage means. Alternatively, re-execution can be performed. Therefore, there is no need to reduce the shock proof function, increase the number of processes for exchanging data between memories, or increase the number or size of memories.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a mini-disc apparatus and a mini-disc editing method according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing a schematic configuration of one embodiment of a mini disk device of the present invention. In FIG. 1, the mini disc device rotates a mini disc as an information recording medium 100 by a spindle motor 101. The mini disk 100 records data by applying a modulation magnetic field corresponding to the recording data with the magnetic head 103 in a state where the optical head 102 irradiates the laser beam, and records the recording tracks of the mini disk 100 with the optical head. By tracing with the laser light from 102, information is reproduced magneto-optically.

Here, the optical head 102 comprises an optical component such as a laser light source and a lens, a photodetector, and the like, and is provided on the side of the mini disk 100 opposite to the magnetic head 103. The output from the optical head 102 (the output from the photodetector) is supplied to a reproduction amplifier (RF amplifier).
In addition to the optical head 1,
A focus error signal and a tracking error signal are extracted from the output of No. 02 and supplied to the servo control circuit 105, and the reproduced signal is binarized and supplied to a decoder (EFM decoder) 106.

The servo control circuit 105 is composed of control circuits for focus servo, tracking servo, spindle servo, slide servo and the like. The focus servo and tracking servo control circuits have a focus error signal and a tracking error signal of 0, respectively. In this way, the laser beam is controlled so that the focal point of the laser beam is correctly traced to the recording track. The spindle servo control circuit controls the spindle motor 101 so as to rotate the mini disc 100 at a predetermined rotation speed, and the slide servo control circuit controls the mini disc 100 specified by the system controller (CPU) 107. Has a function of moving the optical head 102 and the magnetic head 103 to the target track. The servo control circuit 105 transmits information indicating the operation state of each of the various servo-controlled units as described above to the system controller (CP).
U).

A panel switch 108 is connected to the system controller (CPU) 107. From this panel switch 108, an operation mode (recording mode, reproducing mode, etc.) of the recording / reproducing apparatus can be input and designated.
A system controller (CPU) 107 according to the operation mode input from the panel switch 108
Performs recording control and reproduction control. The system controller (CPU) 107 also controls the optical head 10 based on address information (for example, sectors and clusters) recorded in auxiliary data (UTOC area) of the mini disc 100.
2 and the position where the magnetic head 103 traces. A display 109 is connected to the system controller (CPU) 107,
Based on the address information (for example, cluster, sector)
It displays the recording or playback time.

The mini-disc device has a low-pass filter (LPF) for performing recording processing.
r) 110, A / D conversion circuit 111, ATRAC encoder (compressor) 112, RAM control circuit 113 as control means, RAM including first storage means and second storage means
(Random access memory) 114, encoder (EF
M encoder) 115 and a magnetic head drive circuit 116 are provided.

In order to perform a reproduction process, a decoder (EFM decoder) 106 and a RAM (random access memory) 11 having a first storage means and a second storage means are provided.
7. RAM control circuit 118 as control means, ATRAC
A decoder (expander) 119, a D / A conversion circuit 120, and a low-pass filter (LPF) 121 are provided.

Here, the CPU 107 corresponds to the controller unit and the shock-proof memory controller in the conventional mini disk device, and the ATRAC encoder 1
12. The ATRAC decoder 119 corresponds to the ATRAC section in the conventional mini-disc device.
14, 117 correspond to the shock-proof memory in the conventional mini-disc device, and
The decoder 106 is an E-decoder in a conventional mini-disc device.
It corresponds to the FM encoder / decoder section.

Next, the operation of recording an analog audio signal on the mini disc 100 will be described. First, an operation of recording an analog audio signal on the mini disc 100 will be described. The analog audio signal input from the analog input terminal Ain is sampled and quantized by the A / D conversion circuit 111 via the LPF 110 and output to the ATRAC encoder 112. ATRAC encoder 1
12 receives the quantized audio signal, performs ATRAC data compression, and outputs the data to the RAM control circuit 113.

When data is input, the RAM control circuit 113 sequentially transfers the data to a predetermined address of the RAM 114 specified by the CPU 107, and reads data from a predetermined address of the RAM 114 specified by the CPU 107, and Is supplied to the encoder 115.

In the encoder 115, the RAM control circuit 1
The data supplied from 13 is encoded in real time into an EFM signal, which is a recording format on a disk, and supplied to a magnetic head drive circuit 116. The magnetic head drive circuit 116 drives the magnetic head 103 so that a modulation magnetic field corresponding to the recording data is applied to the disk 100.

At this time, the CPU 107
The data read in a burst from the disk 100
The recording position is controlled so as to be continuously recorded on the recording track of the recording. This recording position is controlled by the CPU 107 by the RA.
This is performed by managing the recording position of the recording data read out in a burst from M114 and supplying a control signal specifying the recording position of the disk 100 to the servo control circuit 105.

Further, the CPU 107 monitors the state of the panel switch 108. If there is a recording stop operation, the CPU 107 completes the recording processing of the input signal up to that point, and then tracks the input signal to the UTOC area of the disk 100. Perform registration processing.

Next, the operation of reading data recorded on the mini-disc 100 and reproducing it as an analog audio signal will be described. When reading data recorded on the mini disc 100, the decoder 106
Demodulates the reproduced signal into binary data,
A decoding process and an error correction process are performed, and the corrected reproduction data is supplied to the RAM control circuit 118 as compressed audio data.

When the compressed voice data is input, the RAM control circuit 118
The compressed audio data is sequentially transferred to a predetermined address of the RAM 117 and read out from the predetermined address of the RAM 117 specified by the CPU 107, and is read out from the ATRAC decoder 119.
To supply.

The RAM control circuit 118 has an ATRA
In addition to the process of extracting the header from the compressed audio data supplied to the C decoder 119 and providing it to the CPU 107,
Various processes such as direct access to the RAM 117 by the U 107 and error correction in units of sound groups are executed.

When the ATRAC decoder 119 demodulates the audio data from the compressed audio data, it supplies the demodulated audio data to the D / A conversion circuit 120 to convert it into an audio signal. The audio signal is output from the analog output terminal Aout via the LPF 121.

Next, the signal recording format of the mini disc and undo and redo will be described. FIG.
FIG. 3 is a schematic diagram showing a signal recording format of sector 0 of a mini disk. FIG. 3 is a schematic diagram showing a signal recording format of sector 1 of the mini disk. FIG. 4 is a schematic diagram showing a signal recording format of sector 2 of the mini disk. FIG. 5 is a schematic diagram showing a signal recording format of sector 4 of the mini disk. Here, FIGS. 2, 3,
4 and 5, four bytes in one horizontal row are defined as one slot.

The UTOC data of the mini disk includes sectors 0, 1, 2, and 4, and each sector has data of a pointer area including pointer data and slot data. Of these sectors, sector 0 is data for notifying the location of music data, and which sector data of sectors 1, 2, and 4 is used is determined by the data of "Used Sectors" of sector 0. You can know by referring. Sectors 1, 2, and 4 are data indicating the name of each track and the date and time when the data was recorded, and are not directly related to the reproduction of music data. In the data of the pointer area, the slot data of each sector includes pointer data (P-TNOX, P-TNAX, P-TRD).
x, P-DFA, P-EMPTY, Link-P). In the editing operation, pointer data or slot data of these sectors is manipulated, not the recorded data recorded on the mini disk. For example, pointer data (P-TNOX, P-
If TNAx, P-TRDx) is 0, it indicates that there is no recording data corresponding to that track.

In FIG. 2, a sector 0 has a space for storing a start address and an end address of each track, a track mode and a Link-P in units of two slots, and one track is allocated to a plurality of areas on a disk. When recorded, each slot is linked using Link-P. Sector 0 is ERA of editing work.
In the case of SE and MOVE, only the pointer data may be changed.
In this case, the pointer data and the slot data may be changed.

In FIG. 3, a sector 1 has a space for storing a disk name and a track name in units of two slots, and one set exists for a disk name and 255 sets exist for a track name. When it is desired to give a name longer than the data length that can be stored in the second slot, it is possible to point to another slot using the Link-P of the last byte of the second slot. In that case, the total number of tracks that can be named decreases. Sector 1 includes ERASE, MOVE, DIVIDE, COMBI
In the case of NE, only the pointer data may be changed.

In FIG. 4, a sector 2 has a space for storing a recording date and time and a maker code / model code in units of two slots.
There are 255 sets for sets and track recording dates. Sector 2 includes ERASE, MOVE, DI
In the case of VIDE or COMBINE, only the pointer data may be changed.

In FIG. 5, similarly to the sector 1, the sector 4 has a space for storing the disk name and the track name in units of two slots.
There are 255 pairs for pairs and track names. When it is desired to give a name longer than the data length that can be stored in the second slot, it is possible to point to another slot using the Link-P of the last byte of the second slot. Sector 4 includes ERASE, MOVE, DIV
In the case of IDE and COMBINE, only the pointer data may be changed.

As described above, sector 0 in the UTOC area,
1, 2 and 4 are ERASE, MOVE, DIVIDE,
At the time of COMBINE editing, sector 0 may change pointer data and slot data,
In sectors 1, 2, and 4, only the pointer data may be changed. Therefore, the pointer data and the slot data of the sector 0 in the UTOC area and the sectors 1, 2,.
By backing up the pointer data of No. 4 as a backup, it is possible to undo or redo the editing work.

FIG. 6 is a schematic diagram showing a schematic configuration of the RAM in the mini disk device of this embodiment. When editing mini discs, DEVIDE, COMBINE
In this case, the pointer data and the slot data of the sector 0 and the pointer data of the sectors 1, 2, and 4 may be changed. In MOVE and ERASE, only the pointer data of sectors 0, 1, 2, and 4 may be changed. The RAM stores all UTOs as shown in FIG.
Area A (first storage means) in which C data is stored;
Pointer area data that is changed by editing sectors 0, 1, 2, and 4 (slot data and pointer data)
B (second storage means) for storing data and an area C for storing other data (data for shock proof)
In the area B, only the slot data or the pointer data that is changed by the editing work of the sectors 0, 1, 2, and 4 is rewritten as needed.

When playing the mini disc for the first time, RA
UTOC data is written in the area A of M, and pointer data and slot data of the sector 0 and pointer data of the sectors 1, 2, and 4 are written in the area B. When an editing operation (DEVIDE (division), COMBINE (combination), MOVE (move), ERASE (deletion)) is performed, the RAM control circuit stores pointer data or slot data that causes a change in each sector in the RAM area B. Is controlled to write to When performing the undo or redo of the editing work, the RAM control circuit determines the area A based on the data of the sector related to the undo or redo among the pointer data or slot data of each sector stored in the area B of the RAM. UTOC data is rewritten.

More specifically, in FIG.
07 writes the data of the UTOC area in the area A of the RAM 117 when the recordable mini-disc 100 is set. Further, sector 0 is located in the area B.
Pointer data and slot data and sectors 1, 2,.
4 is written in advance. When an operation for editing is performed with the panel switch 108, the CPU 107
Operates the data in the UTOC area read into the RAM 117 via the RAM control circuit 118. At this time, the data in the area B of the RAM 117 is stored in the UTO before editing.
This is a backup of the C area. That is, pointer data and slot data that are changed by the editing work of the sectors 0, 1, 2, and 4 are written in the area B of the RAM 117.
When undoing or redoing editing work, the CPU 10
7 rewrites the UTOC data of the area A based on the data of the sector related to undo or redo among the data of each sector stored in the area B of the RAM 117. Thus, undo or redo can be performed. Then, when the minidisk 100 is replaced, the UTOC data stored in the RAM 117 is written to the minidisk 100.

FIG. 7 is a schematic diagram for explaining the undo or redo of the RAM in the mini disc editing method of the present invention. In FIG. 7, first, at the time of starting the reproduction of the minidisk (initial state), the UTOC of the minidisk is used.
The area data A is written to the area A. Next, one of the above-mentioned editing operations (editing 1) is executed. Then, the data B on which the editing 1 has been executed is written into the area A, and the data A before the editing 1 is executed on the area A is written into the area B. Here, as described above, the data written in the area B is only the data changed by the editing operation. When the next editing operation (edit 2) is executed, the data C on which the edit 2 has been executed is written in the area A, and the data before the edit 2 is executed (after the edit 1 is executed) is written in the area B. B is written. Here, the data of the data A and the data B are stored in the area B.

When the editing 2 is canceled, the data B stored in the area B is written in the area A, and the data C after the execution of the editing 2 is written in the area B. When the re-execution of the edit 2 is executed after the above-described cancellation is executed, the data C after the edit 2 of the area B is written in the area A. In this way,
It is possible to undo or redo editing work. here,
The CPU 107 controls the writing of data in the area B. When the number of edits increases, new data is overwritten in the data stored in the area B in order from the oldest data.

By the above processing, the edited contents can be canceled (undo) or re-executed (redo) after the editing operation. If a plurality of backups are saved and their history is managed, undo and redo can be performed a plurality of times.

Further, the memory required for undo / redo requires a smaller capacity than that of the actual UTOC area. Specifically, as shown in FIGS. 2, 3, 4 and 5, the data amount of one sector (header and data area) is (16 + 2336) = 2352 bytes, and the UTOC
The data amount of the area (sectors 0, 1, 2, 4) is (2362)
× 4) = 9408 bytes. However, as described above, the data amount of the data in the pointer area that is changed with the execution of the editing work is (255 + 255 +) in the sector 0 as shown by the hatched portions in FIGS. 2, 3, 4, and 5.
3) = 513 bytes, (255 + 2) in sector 1
56 + 1) = 512 bytes, and in sector 2 (25
5 + 256 + 1) = 512 bytes, and in sector 4, (255 + 256 + 1) = 512 bytes. In other words, the data amount of the sectors 0, 1, 2, and 4 is 2049 bytes, which is smaller than the data amount (2352 bytes) of one sector in the actual UTOC area, and the memory required for undo / redo requires a small capacity. .

In another editing operation, when the title of a track is changed or newly written, the pointer data and the slot data of the sector 1 and the sector 4 may be changed. When undoing or redoing an editing operation for changing or newly writing a file, the pointer data and the slot data of the sector 1 and the sector 4 may be backed up.

Further, when recording the date and time when new music data is recorded, the pointer data and slot data of sector 2 may be changed. Alternatively, when performing redo, the pointer data and the slot data of the sector 2 may be backed up.

[0057]

According to the present invention, it is possible to back up data related to editing work in a storage area smaller than the UTOC area, and to cancel (undo) and re-execute (redo) editing work. .

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of an embodiment of a mini disk device of the present invention.

FIG. 2 is a schematic diagram showing a signal recording format of sector 0 of a mini disk.

FIG. 3 is a schematic diagram showing a signal recording format of a sector 1 of a mini disk.

FIG. 4 is a schematic diagram showing a signal recording format of a sector 2 of the mini disk.

FIG. 5 is a schematic diagram showing a signal recording format of a sector 4 of the mini disk.

FIG. 6 is a schematic diagram showing a schematic configuration of a RAM in the mini disk device of the present invention.

FIG. 7 is a RAM in the mini disc editing method of the present invention.
FIG. 4 is a schematic diagram for explaining an undo or redo of FIG.

FIG. 8 is a schematic diagram showing a schematic configuration of a conventional mini disk device.

FIG. 9 is a diagram for explaining a signal recording format of a recordable MD.

FIG. 10 is a schematic diagram illustrating a configuration example of recording data of a recordable MD.

[Explanation of symbols]

100 · · disk, 101 · · spindle motor, 1
02 optical head, 103 magnetic head, 104
Reproduction amplifier, 105 servo control circuit, 106 encoder, 107 CPU, 108 panel switch, 109 display, 110 LPF, 11
1. A / D conversion circuit, 112 ATRAC encoder, 113 RAM control circuit, 114 RAM, 1
15 · · encoder, 116 · · · magnetic head drive circuit,
117 RAM, 118 RAM control circuit, 119
..ATRAC decoder, 120 D / A conversion circuit,
121 LPF 801 mini disk, 802 A / D converter, 8
03 · · · D / A converter, 804 · · · ATRAC section (encoder, decoder), 805 · · · shockproof memory, 806 · · · shockproof memory controller,
807 EFM encoder / decoder, 808
DAI, 809-Controller (CPU)

Claims (2)

[Claims] 1. An audio signal, which is subjected to a compression encoding process, to record data representing the audio signal, slot data indicating an address, a track name, a recording date and time of the recording data, and pointer data indicating a position of the slot data. In a mini-disc apparatus for recording and reproducing a mini-disc capable of recording digital audio data having auxiliary data having data in a pointer area, the auxiliary data of the digital audio data read from the mini-disc First storage means for storing data; and data of the pointer area, which is changed in accordance with execution of editing processing of erasing, moving, dividing, and combining the recording data among the auxiliary data stored in the first storage means. A second storage unit for storing the editing process, and when the editing process is canceled or re-executed, Minidisk apparatus characterized by comprising a control means for controlling rewriting of said auxiliary data stored in said first memory means based on the data stored the pointer regions in the second storage means. 2. Recording data representing the audio signal by subjecting the audio signal to compression encoding, slot data indicating the address, track name, recording date and time of the recording data, and pointer data indicating the position of the slot data. A mini-disc editing method for editing the recorded data of a mini-disc capable of recording digital audio data comprising auxiliary data having data in a pointer area comprising: the digital audio read from the mini-disc The auxiliary data of data is stored, and the data of the pointer area of the auxiliary data that is changed in accordance with the execution of the editing process of erasing, moving, dividing, and combining the recording data is stored, and the editing process is canceled. Or, based on the data of the pointer area stored at the time of re-execution, A minidisk editing method, characterized by rewriting the stored auxiliary data.