JP3379706B2 - Multiple data synchronous playback method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a disk in particular applications have different data recording area different or data format, having a plurality of types of data each recording and reproducing can be a plurality of areas (areas) Data for synchronous playback of multiple types of data from
Data reproduction method .

[0002]

2. Description of the Related Art Various optical recording media for recording information optically or magneto-optically and reproducing the information optically have been developed.
Has been put to practical use. Such optical recording media include those for reproduction only and those for both recording and reproduction. A conventional hybrid MD (mini-disc) has a reproduction area and a recording area, and a CD + has a CDDA area in which music and the like are recorded and a CDROM in which computer data and the like are recorded.
These discs have a plurality of data recording areas for different purposes or different data formats, although they are physically one disc. The same applies to DVDs.

[0003]

When data related to each other is recorded in both of the plurality of recording areas (areas), the reproduction is performed as follows. That is, simply play these related data separately,
When it is necessary to synchronously reproduce related data, at least one of the relevant data reproduced from the optical recording medium is loaded into a large-capacity memory of a personal computer, and reproduced in synchronization with the reproduction of the other data from the optical recording medium. Was.

[0004] Also, when a karaoke user records his or her singing voice using a disk on which a performance of an orchestra or the like is recorded, such as a karaoke, and reproduces the singing voice in synchronism with the performance, the memory of the personal computer is used in the same manner as described above. Needed to be synchronized. Further, the same applies to a case where two related data are to be synchronously recorded.

Accordingly, the present invention provides a plurality of types of disc-shaped information recording media capable of synchronously recording and reproducing two or more related data from a single disc .
An object of the present invention is to provide a multiple data synchronous reproduction method for synchronously reproducing data .

[0006]

Means for Solving the Problems To achieve the above object, the present invention provides a multi- device having the following constitutions (1) to (3).
Data synchronization playback method . (1) Synchronous playback should be performed for the first data to be played
In order to read out the second data, the first data is read by the head.
Data and the second data in the first data area and the second data.
Data synchronous playback method that reads data alternately from the data area
And comprising a playback start step and a playback step ,
In the reproduction start step , a predetermined unit of the first data
The head is moved to the first data area for reading.
Read the first data and write it to the memory,
The head is moved to the second data to read the second data.
Data area, read the second data, and
Written in the memory and stored in the memory
The first data and the second data are reproduced synchronously.
In the while extension time axis at least one of the data first
Step for starting reading of one data and the second data
The reproduction step includes the reproduction start step.
The first data to be written into the memory and the previous
The relationship between the data amount and the second data,
Of the first data and the second data alternately written to
The first data is read so that the relationship of the data amount is different.
Seek the head to the first data area
Read the first data and write it to the memory
The head is moved to read the second data.
Seeks to the second data area and reads the second data
And writes the first data and the second data
It is a step to alternately play with data
Multiple data synchronous playback method. (2) Synchronous reproduction should be performed for the first data to be reproduced
In order to read out the second data, the first data is read by the head.
Data and the second data in the first data area and the second data.
Data synchronous playback method that reads data alternately from the data area
And comprising a playback start step and a playback step ,
In the reproduction start step , a predetermined unit of the first data
The head is moved to the first data area for reading.
Read the first data and write it to the memory,
The head is moved to the second data to read the second data.
Data area, read the second data, and
Written in the memory and stored in the memory
The first data and the second data are reproduced synchronously.
In the while extension time axis at least one of the data first
Step for starting reading of one data and the second data
The reproduction step includes the reproduction start step.
The first data to be written into the memory and the previous
The relationship between the second data and the data amount threshold,
The first data and the second data alternately written to a memory.
So that the relationship between the data amount and the threshold of the data amount is different.
The head is moved to the first data area to read data.
To the memory, read the first data, and read the memory
To read the second data.
Seek to the second data area,
Is read and written to the memory, and the first data and
This is a step of alternately reproducing the second data.
And a method for synchronously reproducing a plurality of data. (3) The method for synchronously reproducing a plurality of data according to claim 1 or 2
There are, the playback start step, predetermined first data
The head is moved to the first data area to read a unit.
And read the first data to a first level.
Write to the memory and read the second data until
Seek the head to the second data area to
Reading said second data to a second level in said memory
And the first stored in the memory respectively.
So that the data and the second data are reproduced synchronously.
The first data while extending at least one of the data on the time axis.
Starting the reading of the second data and the second data.
Ri, the reproduction step reads the first data
Seek the head to the first data area,
Reading the first data and reading a third data higher than the first level;
Level to write to the memory, the second data
To read out the predetermined unit, the said head second data
Seek to the area, read out the second data, and
2 to the memory, and the first data
And reading the second data alternately.
A method for synchronously reproducing a plurality of data items.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a disk-shaped information recording medium according to the present invention will be described below with reference to the drawings. FIG. 1 is a diagram schematically showing a plane of a preferred embodiment of a disc-shaped information recording medium according to the present invention. This disc 10 is an optical recording medium having a diameter of 120 mm, and has a first lead-in area 1 from the inner circumference to the outer circumference.
1, first data area 12, first lead-out area 1
3, second lead-in area 14, second data area 1
5, the respective areas are arranged substantially concentrically in the order of the second lead-out area 16. Here, the first lead-in area 11 constitutes a first TOC for recording an address of each data of the first data area 12 and the like, and the second lead-in area 14 contains each data of the second data area 15. And a second TOC for recording the address and the like.

FIGS. 2 and 3 show these first and second TOs.
It is a figure which shows the recording data of C typically. 2 and 3
The addresses (start address and end address) of the synchronous data marked with * are specific to the present invention, and some of the modes marked with Δ include permission / prohibition of recording, permission / prohibition of copy, audio Data / video data, monaural / stereo, emphasis on / off
In addition to the distinction of OFF, identification data indicating the existence of the synchronization information is recorded as being unique to the present invention. The address and identification data of the synchronization data unique to the present invention are the first and the second.
Are written in advance at the time of manufacturing the disc so that it is possible to determine whether the data in the first data area 12 and the data in the second data area 15 should be synchronously reproduced regardless of which TOC is accessed during reproduction. Become. As a result, the reproduction mode is the first data area or the second data area.
Three modes are possible: single playback of any one of the data areas and simultaneous progressive playback of both areas.

In the above example, the first data area 12 and the second
Although the data area 15 is already recorded and the synchronous reproduction of information from a reproduction-only disc has been described, a karaoke performance is recorded in the first data area 12 in advance, and the second data area 15 has a sector. Although it is configured, it is also possible to make it recordable so that no data is contained when the disc is sold. In other words, the disc can be used as a recording / playback type disc, and the user can record the singing voice synchronously with the second data area 15 while reproducing the performance of the karaoke from the first data area 12, and can reproduce the performance and the singing voice synchronously during reproduction. . Note that FIG.
The disc type in the first TOC indicates whether the disc type is a recording / playback type, a reproduction only type, or only one area is a reproduction only type.

Table 1 An example of using such a recording / playback type disc will be described. First data area Karaoke voice or voice with video 2nd data area The singing voice of each user is put in, and during practice, only the first data area is reproduced and practiced. During recording, the second data area is heard while listening to the first data area. Only the voice of each user may be recorded in the area, and only the voice of each user in the second data area may be reproduced at the time of reproduction, or the first data area and the second data area may be reproduced simultaneously at the time of reproduction. For example, only the moving image in the first data area is reproduced, and the singing voice in the second data area is reproduced without reproducing the moving image in the first data area.

Table 2 First data area Music 2nd data area Video clip related to the music At first, the music in the first data area is recorded, and the video clip related to the music is newly recorded in the second data area on the TOC. When the user wants to listen, the image of the video clip is also reproduced synchronously. in this case,
The synchronization information is recorded in both TOCs. When the first data area is dedicated to reproduction, the synchronization information is recorded only in the second data area, and only one of them is read during reproduction.

Next, a preferred example of the synchronous reproduction method will be described. FIG. 5 is a flowchart showing a preferred example of the synchronous reproduction method. This synchronous reproduction method and the synchronous recording / reproducing method and the synchronous recording method described later are all shown in FIG.
Is executed by the disk device having the configuration of the block diagram shown in FIG. Note that the following example shows the synchronous playback method,
Although the reproducing method and the synchronous recording method are described, the disk device in FIG. 4 is described as having both the recording and reproducing functions. However, it is needless to say that the recording function is unnecessary when performing only the reproducing.

In FIG. 4, a motor driver / tracking / focus servo control circuit 24 controls the disk 10 to be rotated at a CLV (constant linear velocity) by a spindle (SP) motor 18. The optical head has an optical pickup 20A and a recording magnetic (magnetic field modulation) head 20B, and its movement is controlled by a servo control circuit 24. The EFM signal read from the disk 10 by the optical pickup 20A is supplied to a reproduction circuit 28 including a preamplifier and the like, and its output signal is supplied to a signal processing circuit 32. At the time of recording, the signal processing circuit 32
Is supplied to a recording magnetic head 20B via a recording circuit 26 including a recording amplifier and the like. The system controller 30 includes a signal processing circuit 32 and a servo control circuit 2
It exchanges signals with 4 to control the entire optical disk recording / reproducing apparatus. The output signal of the optical pickup 20A is also supplied to the address reproducing circuit 22, where the ADIP signal written in advance on the disk, that is, the address information and the speed information which are FM-modulated by wobbling are used to determine the current state of the optical pickup 20A. Judge the truck,
The reproduced address is provided to the servo control circuit 24.

The signal processing circuit 32 is provided with terminals for transmitting and receiving the first and second data to and from the outside. In addition, the first and second memories 34 and 36 are connected to the signal processing circuit 32, and the data is temporarily stored and subsequently read. The output signal of the signal processing circuit 32 is supplied to a motor driver / tracking / focus control circuit 24, which controls the rotation of the spindle motor 18 and the tracking servo control and focus servo control of the optical pickup. The optical pickup 20A and the recording magnetic head 20B are connected to the disk 1 by a traverse motor (not shown).
The objective lens of the optical pickup 20A can be moved in the focus direction, that is, along the optical path by a focus servo control mechanism (not shown). The signal processing circuit 32 and the motor driver / tracking / focus control circuit 24 exchange signals with the system controller 30 to control the operation of the entire disk device. An input unit for the user to input various instructions is not shown. As is well known, the system controller 30 has a CPU, and the signal processing circuit 3
2 also has a CPU, and performs an operation according to a flowchart described later.

The optical pickup 20A also has a laser diode for irradiating the disk 10 with a laser beam,
It is also used to output a signal obtained by reproducing optical information recorded on the disk 10 based on the reflected light, and to detect a focus error signal by a known astigmatism method and a tracking error signal by a phase difference method. . These error signals are processed by the signal processing circuit 32 via the reproduction circuit 28, and supply necessary feedback information to the servo control circuit 24. The configuration of FIG. 4 has a recording circuit 26 and a recording magnetic head 20B as in the case of the MD disk device.
Such a recording magnetic head 20B is unnecessary. Also, D
In the case of the type in which recording is performed by phase change such as VD, the recording is performed by increasing the laser beam power higher than during reproduction and heating the recording layer so as to exceed the phase displacement point. The use magnetic head 20B is unnecessary.

Next, an example of the synchronous reproduction method will be described with reference to the flowchart of FIG. Both the first and second data areas are recordable areas, and the first data area already contains karaoke voice or video-attached voice, and the second data area contains the singing voice of each user, and is synchronously reproduced by an input device (not shown). When the instruction is given, the processing is as shown in the flowchart of FIG. First, with the power turned on, the focus servo is turned on (step S1), the spindle motor is started (step S2), tracking control is performed (step S3), and an address is detected (step S3).
4), TOC data is read (step S5).

In the following description, it is assumed that an instruction for synchronous reproduction has been input from a control instruction input unit (not shown). It is determined whether or not such an instruction has been issued (step S6). . When there is an instruction for synchronous reproduction, the TOC data including synchronous data is stored in the system controller 30. Therefore, when the data read rate from the disk is the same as the CD and the final data transmission rate such as audio data is the same as in the case of a CD. It is determined whether or not the rate ratio is 1 (step S7). If the rate ratio is 1 , the rotational speed of the spindle motor is increased so that the rate ratio becomes at least a predetermined value of 2 times or more (for example, 4 times) (step S7).
8). It should be noted that an MD having a compression / decompression rate ratio of 5 times such as MD may be used as it is. FIG. 6 is a diagram schematically showing movement of the optical pickup 20A on the disk 10. As shown in FIG. In the figure, P1 to P11 indicate phase 1 to phase 11. FIG. 7 is a diagram showing the remaining data amount of each of the memories 34 and 36 corresponding to the phase of the optical pickup 20A. First, as shown by P1 in FIG. 6, the first data area 12 is accessed (step S9). In addition,
In the following description, access to the first data area 12 or the second data area 15 includes an operation of searching for desired data in the data area.

Table 3 Each phase is described below. <Phase 1> The first data is written to the first memory 34 at a quadruple speed until it reaches a predetermined value that does not reach the maximum value (steps S10 and S11). <Phase 2> When the predetermined value is reached, the first data area is read out. Access to second data area and first memory pause (Step S12) <Phase 3> Write second data to second memory 36 at quadruple speed and first memory pause (Step S12) <Phase 4> When maximum value is reached 1x speed of starting reading from the memory in synchronization with the first memory data and the second memory data (in this example, synchronization is performed at the time of memory output, but compression data and the like, which require decompression time for the first and second data, of course, etc.) Thereafter, synchronization processing is performed) and the first data area is accessed (steps S13 and S13).
14) <Phase 5> It is detected that the remaining amount of the first memory is empty, and the first data is written to the first memory at a quadruple speed (kick is repeated at this position to wait until an empty is detected). Reading of both the first data area and the second data area continues at 1 × speed (Steps S15, S16, S17) <Phase 6> Access to the second data area Reading of both the first data area and the second data area continues at 1 × speed (Step S18) <Phase 7> It is detected that the remaining amount of the second memory is empty, and the second data is written into the second memory at a quadruple speed. (Kick is repeated at this position to wait until an empty is detected.) The reading of both the first memory and the second memory is continued at 1 × speed (Steps S19, S20, S21) <Phase 8 to Phase 11> Phase 4, 5, 6, 7
Is repeated until the reproduction of all data is completed (step S
22 → S14).

In the above operation, the writing at the quadruple speed compresses the time axis, and the data is read at a speed lower than the writing speed at the time of reading, thereby extending the time axis. At the time of reproduction, the first data area and the second data area are reproduced at the same time to listen to each user's voice while mixing them, or by this operation, it is possible to continuously reproduce a number of continuous images and voices. The point here is that the operation of the pickup is
In order to avoid conflicts in the writing process to 4, 36,
It is desirable to delay (processing in phases 1, 2, 3), and as in the processing in phases 4, 5, 6, and 7, it is desirable that the read timing on the disk be close to an intermediate time when viewed from each. In addition, it is desirable to allow a margin time required for retry processing for dealing with a reading error from the disk 10 and the like.

The movement transition diagram of FIG. 6 is a schematic diagram. In practice, the rotation direction of the disk is constant, and the rotation waiting time,
It is necessary to cope with the case where the rotation speeds of the inner and outer disks are different in CLV. The memories 34 and 36 in the block diagram of FIG.
Is shown in two parts, but a single memory, for example 4
The MB memory may be divided and used for TOC, first and second areas. In the above example, two different data are synchronously reproduced using two memories.
Simultaneous reproduction of three or more data can be performed in the same manner.

Next, an example of the synchronous recording / reproducing method will be described with reference to the flowcharts shown in FIGS. FIG. 10 is a diagram schematically showing movement of the optical pickup 20A on the disk 10. As shown in FIG. In the figure, P1 to P9 indicate phase 1 to phase 9. FIG. 11 shows each memory 34 corresponding to the phase of the optical pickup 20A.
It is a figure which shows the data remaining amount of 36. First, P in FIG.
Access the first data area as indicated by 1.

Table 4 Each phase is described below. <Phase 1> Writing of data in the first data area to the first memory (4 × speed) to the maximum value is started (step S1).
0) <Phase 2> When the maximum value is reached, reproduction is started from the first memory (1x speed) (steps S11 and S12A). At the same time, second data from the outside is transferred to the second memory (1x speed).
Start writing in synchronization with the first data. Kick to predetermined first data area and wait (stand by repeating kick at this position until a predetermined value is detected) (Step S15) <Phase 3> First memory is predetermined When the value (or the second memory becomes an intermediate value between the maximum value and the empty value), the data at the continuation position of the first data area is written to the first memory (4 × speed) up to the maximum value (steps S16 and S1).
7) Continue reading from the first memory Continue writing external second data to the second memory <Phase 4> When the second memory reaches the maximum value, stop writing to the second memory (steps S23 and S24). ,
Access to predetermined second data area (Step S25) Continue reading from first memory (Step S26) Continue writing external second data to second memory (Step S26) <Phase 5> Second memory reaches maximum value Then, from the predetermined position in the second data area, a sector is formed by adding a synchronization signal and error correction, and writing is started until the disk becomes empty (quadruple speed) (steps S27, S28). Reading from the first memory is continued (step S27, S28). (Step S29) Continue writing external second data to the second memory (Step S29) <Phase 6> When the second memory becomes empty, stop writing to the disk (Steps S30, S3)
1), access to a predetermined first data area (step S
32) Continue reading from the first memory (Step S33) Continue writing external second data to the second memory (Step S33) <Phase 7> When the first memory becomes empty, the first
Start writing the data at the continuation position of the data area to the first memory up to the maximum value (4 × speed) (steps S34, S3)
5) Continue reading from the first memory (Step S36) Continue writing external second data to the second memory (Step S36) <Phase 8> Same as Phase 4, and thereafter,
Steps 5, 6, and 7 are repeated until the recording of all data is completed (step S37 → S23). <Final phase> When the predetermined recording is completed, the contents of the two data as synchronous data, the synchronous start address and the end address are recorded on the TOC simultaneously with the title and other necessary data (step S38). This allows the first data area and the second data area to be played simultaneously during playback, and to listen to each user's voice while mixing them together. This operation allows continuous playback of any number of video and audio songs. It is.

Next, an example of a synchronous recording method will be described with reference to FIGS. FIG. 12 shows an optical pickup 2
FIG. 3 is a diagram schematically showing the movement of the 0A on the disk 10.
In the figure, P1 to P10 indicate phase 1 to phase 10. FIG. 13 is a diagram showing the remaining data amount of each of the memories 34 and 36 corresponding to the phase of the optical pickup 20A. First, the first data area is accessed as indicated by P1 in FIG. Although the flowchart of the example of the synchronous recording method is omitted, the flowchart of the example of the synchronous recording / reproducing method described above (FIGS. 8 and 9) is modified as necessary. That is, steps S1 to S in FIG.
After executing the steps up to 9, the following phases are executed.

Table 5 Each phase is described below. <Phase 1> The first data from the outside is stored in the first memory (1 × speed) at a predetermined value other than the maximum value (the predetermined value is the first value
There is a method for detecting that the memory has reached an intermediate value between the maximum value and the empty value, and a method for detecting that the second memory has reached an intermediate value between the maximum value and the empty value. Start writing to 2nd memory (1x speed) in synchronization with 1st data Access a predetermined 1st data area <Phase 2> When the 1st memory reaches a predetermined value, a synchronization signal and error correction from a predetermined position of the 1st data area To start writing until the disk becomes empty (4x speed) Continue writing first external data to first memory Continue writing second external data to second memory <Phase 3> The writing to the disc is stopped by the empty, the predetermined second data area is accessed, the first data from the outside is written to the first memory, and the second data from the outside is continued. Continue writing data to the second memory <Phase 4> When the first memory reaches the maximum value of the predetermined value, a synchronization signal and error correction are added from a predetermined position of the second data area to form a sector and the disk becomes empty. Start writing until (4x speed) Continue writing first external data to first memory Continue writing second external data to second memory <Phase 5> Stop writing to disk when empty Accesses one data area (although omitted, repeats kick at this position until a maximum value is detected and waits). Writes external first data to first memory. Continues external second data to first memory. Continue writing to <phase 6> When the first memory reaches the predetermined maximum value, add a synchronization signal or error correction from a predetermined position in the first data area to secure Start writing until the disk becomes empty (4x speed) Continue writing first external data to first memory Continue writing second external data to second memory <Phase 7> Same as Phase 3 Then in phase 3,
Repeat steps 4, 5, and 6. <Final phase> When the predetermined recording is completed, the contents of the two data as synchronous data, the synchronous start address and the end address are recorded on the TOC simultaneously with the title and other necessary data.

[0025]

As described above, a plurality of data of the present invention
Since the synchronous reproduction method is configured as described above, the following effects can be obtained. That is, related data can be synchronously reproduced without using an external personal computer or a large-capacity memory and without interrupting continuous information.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing each area of a plane of an embodiment of a disc-shaped information recording medium of the present invention.

FIG. 2 is a diagram schematically showing a data array of a first TOC in an embodiment of the disc-shaped information recording medium of the present invention.

FIG. 3 is a diagram schematically showing a data array of a second TOC in the embodiment of the disc-shaped information recording medium of the present invention.

FIG. 4 is a block diagram illustrating an example of a disc for realizing a synchronous reproduction method, a synchronous recording / reproduction method, and a synchronous recording method.

FIG. 5 is a flowchart showing a preferred example of a synchronous reproduction method.

FIG. 6 is a diagram showing a movement locus of an optical pickup in a preferred example of the synchronous reproduction method.

FIG. 7 is a graph showing a relationship between a position of an optical pickup and a data amount of each memory in a preferred example of a synchronous reproduction method.

FIG. 8 is a part of a flowchart showing a preferred example of a synchronous recording / reproducing method.

FIG. 9 is a part of a flowchart showing a preferred example of the synchronous recording / reproducing method, and is a part subsequent to FIG. 8;

FIG. 10 is a diagram showing a movement locus of an optical pickup in a preferred example of the synchronous recording / reproducing method.

FIG. 11 is a graph showing a relationship between a position of an optical pickup and a data amount of each memory in a preferred example of a synchronous recording / reproducing method.

FIG. 12 is a diagram showing a movement locus of an optical pickup in a preferred example of the synchronous recording method.

FIG. 13 is a graph showing a relationship between a position of an optical pickup and a data amount of each memory in a preferred example of the synchronous recording method.

[Explanation of symbols]

Reference Signs List 10 optical disk 11 first lead-in area 12 first data area 13 first lead-out area 14 second lead-in area 15 second data area 16 second lead-out area 18 spindle (SP) motor 20A optical pickup 20B magnetic field modulation for recording Head 22 Address reproduction circuit 24 Motor driver / tracking / focus servo control circuit 26 Recording circuit 28 Reproduction circuit 30 System controller 32 Signal processing circuit 34 First memory 36 Second memory

Claims (3)

(57) [Claims] 1. The method according to claim 1, wherein the first data to be reproduced is synchronized with the first data.
To read the second data to be done, before the head
The first data and the second data are defined as a first data area.
Synchronization of multiple data read alternately from the second data area
A reproducing method, comprising: a reproducing start step; and a reproducing step , wherein the reproducing start step includes controlling the head to read a predetermined unit of the first data.
Seeks to the first data area and reads the first data
Read out and write to the memory and read out the second data
Seek the head to the second data area to
Reading the second data and writing it to the memory,
The first data and the second data respectively stored in a memory;
And data to be synchronously reproduced, at least one of the data
The first data and the second data while extending the
A step to start reading of the regeneration step is written into the memory to be performed by the playback start step
The relationship between the data amount of the first data and the second data
On the other hand, the first data alternately written to the memory and
In order that the relationship of the data amount with the second data is different,
The head is moved to read the first data to read the first data.
Seek to the data area, read out the first data, and
Before writing to the memory and reading the second data,
Seeking the recording head to the second data area,
Data is read and written to the memory, and the first data is read.
Data and the second data are alternately reproduced.
A method for synchronously reproducing a plurality of data items. 2. The method according to claim 1, wherein the first data to be reproduced is resynchronized.
To read out the second data to be generated , By head
The first data and the second data are defined as a first data area.
Synchronization of multiple data read alternately from the second data area
A playback method, A playback start step and a playback step are provided. , The playback start step is , The head is read to read a predetermined unit of the first data.
Seeks to the first data area and reads the first data
Read out and write to the memory and read out the second data
Seek the head to the second data area to
Reading the second data and writing it to the memory,
The first data and the second data respectively stored in a memory;
Synchronous playback with data , At least one day
The first data and the second data while extending the
To start reading with The playing step is , Writing to the memory performed in the reproduction start step
A threshold value of a data amount between the first data and the second data;
The first data alternately written to the memory for the relationship.
Data and the second data have different data amount thresholds.
The head to read the first data.
Seeks to the first data area and reads the first data
Read out and write to the memory, and read the second data.
Seek the head to the second data area
Read the second data and write it to the memory
The reproduction of the first data and the second data alternately
Performing multiple data synchronization
Raw method. 3. The multiple data synchronization apparatus according to claim 1 or 2,
Raw method , The playback start step is , The head is read to read a predetermined unit of the first data.
Seeks to the first data area and reads the first data
Write to the memory to the first level,
Moving the head to read the second data to read the second data
Seek to the area, read out the second data, and
Write to the memory up to the level, and
Synchronizing the stored and stored first data with the second data
Time axis extension of at least one data to play
While reading out the first data and the second data.
Is the step to start, The playing step is , The head is moved to the first data to read the first data.
Data area, read the first data and
The memory to a third level higher than the first level
To write and read a predetermined unit of the second data ,
The head Seek to the second data area,
2 data is read out to the second level
And reading the first data and the second data.
A step of alternately providing
Data synchronous playback method.