JP3496989B2 - Disk recording device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc recording apparatus for continuously recording a plurality of discs.

[0002]

2. Description of the Related Art A CD (Compact Disc) is known for recording audio information. CD has a diameter of 1
There are two types, 2 cm and 8 cm, and up to about 74 minutes of information is recorded in the form of a digital signal.

On the other hand, in recent years, MDs (minidiscs), which are smaller than CDs (64 mm in diameter), have a reproduction time equivalent to that of CDs, and are capable of writing and rewriting information, are becoming popular.

In such an MD (mini disk), although the diameter is small, it is possible to record and reproduce for 74 minutes like the CD by using the audio compression technique.
Moreover, the use of a shock proof memory (DRAM) also prevents skipping of sound due to vibration.

Specifically, when the DRAM is 1 Mbit, the storage area is filled in about 0.9 seconds at the time of reproduction, and even if a large vibration is applied and the digital signal on the disk cannot be read, it is about. Since the digital signal can be taken from the DRAM for 3 seconds, the pickup makes quick access to the original position on the disk within the 3 seconds and starts reading the digital signal again, thus preventing the occurrence of skipping. It is supposed to be done.

[0006]

By the way, the above-mentioned M
When recording information to D, the recording speed of information to MD is actually faster than the input speed of information from other source, and information from other source is temporarily stored in DRAM. It is designed to be taken out sequentially after being stored. Therefore, in a multi-type MD player, for example, when the relay recording is to be performed on a plurality of MDs, it is the maximum accumulation time of the information in the DRAM after the information is recorded on the first disc. 2 within 3 seconds
Information can be recorded without interruption by exchanging it with the MD of the first sheet.

Of course, even when the MD is reproduced, the DR
Since the reading speed by the pickup is faster than the output speed of the information stored in the AM, the information can be reproduced without interruption even when the second MD is replaced.

However, in the MD player, the MD
It is necessary to write the TOC after recording the information on the MD, and when performing relay recording, after recording the information on the first MD, after writing the TOC on the MD, I will move to the second MD, but at this time D
There is very little data pooled in RAM
The AM is always in an empty state, and MD is exchanged using the time corresponding to this empty capacity, but due to some reason DR
If the free space in the AM is reduced, the data cannot be buffered for the time required for the TOC writing and MD exchange operation, and the sound will not be continued when recording to the next MD. There was a problem. By the way, the same problem occurs when performing relay regeneration.

The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a disc player capable of surely performing relay recording / reproduction for a plurality of discs.

[0010]

The invention according to claim 1 is
Capable of continuous recording / playback of information on multiple discs
In a disc recording device , information holding means for holding a predetermined amount of information to be recorded on each disc, and T for storing TOC to be written on each disc
An OC storage unit, a free space detection unit that detects a free space from the information storage amount of the information holding unit each time information recording on each of the plurality of disks is completed, and a free space by the free space detection unit. TOC write determining means for determining the write timing of the TOC stored in the TOC storage means by determining whether or not the capacity is left for a predetermined time. According to a second aspect of the present invention, in the disc recording apparatus according to the first aspect , when the TOC writing determining means determines that the free space is left for a predetermined time, the TOC writing determining means stores it in the TOC storage means. Has been TO
It is characterized in that C is controlled to be written on the disc.

[0011] According to a third aspect, data of claim 1, wherein
In the disk recording device , the TOC writing determining means controls to replace with a next disk when it is determined that the free space is not left for a predetermined time. According to a fourth aspect of the present invention, in the disc recording apparatus according to the first aspect , the predetermined time is T
It is characterized in that it is the total of the time for writing OC and the time for exchanging to the next disk.

[0012]

According to the disc recording apparatus of the present invention, in the case of continuous recording on a plurality of discs, after the information recording on all the discs is completed, the TOC storage means for all the discs is stored in the TOC storage means. It is possible to prevent the loss of recorded information caused by recording the TOC by controlling so as to record.

Further, in the disc recording apparatus according to the second aspect, during continuous recording on a plurality of discs, when the information recording on each disc is completed, the free space of the information holding means writes the TOC. When there is more than enough time for exchanging time and the time for exchanging to the next disc, the TOC is written to the disc where the information recording is finished, and then the process is shifted to writing information to the next disc, TOC that did not write to the disc
Is stored in the TOC storage means, and is controlled to be recorded on the disc after the continuous recording of the information is completed.

Therefore, it becomes possible to prevent the loss of recorded information caused by recording the TOC, and when the information holding means has a free space, the TO
Since C is written, the total recording time can be shortened.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a disc player of the present invention,
MD for recording / reproducing a digital signal to / from D
It shows an embodiment when applied to a player.

As shown in FIG. 1, the magneto-optical disk 21 of the MD 20 on which digital signals are recorded and reproduced by the MD player 100 is rotatably accommodated in a cartridge 22. The cartridge 22 is provided with a shutter 23 that is slidable, and the MD 20 is
When loaded in the recording / reproducing position of the D player 100, the shutter 23 is opened by a shutter opening / closing mechanism (not shown), and the objective lens of the magnetic head 2 and the optical pickup 4 is inserted from above and below the magneto-optical disk 21 through an opening window (not shown). 3 come close to each other, and recording or reproduction of a digital signal is performed.

The magneto-optical disk 21 has data (ATIP: Address In Pre-groove on Reco) indicating absolute time information.
It is formed so as to wobble (meander) at a frequency obtained by FM-modulating a rdable disc.

When the magneto-optical disk 21 is reproduced, for example, when it is rotated by the spindle motor 1 at a predetermined speed and the beam focused by the objective lens 3 is applied to the magnetic film of the magneto-optical disk 21, the magnetic Kerr effect is obtained. The optical pickup 4 reads the reflected beam in which the plane of polarization is slightly rotated. When the RF signal read by the optical pickup 4 is amplified to a predetermined level by the RF amplifier 7, the wobbling frequency is detected by the address decoder 6, and the address information in the magneto-optical disk 21 is detected even in the information unrecorded portion. It is like this.

The EFM signal in the RF signal extracted by the EFM encoder / decoder 9 is a DR whose data input / output is controlled by the DRAM controller 11.
Once stored in AM12, the data compression encoder
The data is sequentially decoded by the decoder 13, converted into an analog signal by the D / A converter 16, and output.

At the time of data recording, the data converted into a digital signal by the A / D converter 15 is used by the data compression encoder / decoder 13 to make use of the minimum audible limit characteristic of the human ear and the masking effect to about 1/5. After being compressed to some extent, it is encoded by the EFM encoder / decoder 9 and sent to the head drive circuit 5.

When the magnetic head 2 is driven by the head drive circuit 5, the magnetic field modulation is applied to the position of the magnetic film of the magneto-optical disk 21 heated by the beam to the Curie temperature or higher, thereby writing information.

The magneto-optical pickup 4 includes a carriage 14 controlled by a servo controller 8.
Is moved in the radial direction of the magneto-optical disk 21.

When an instruction such as an operation mode is given by the key 18, the system controller 10 controls the operation of each component based on the instruction and the display unit 1
7, the operation mode and the like are displayed. Further, the system controller 10 stores the TOCs of all MDs 20 in which information has been recorded in the memory 35 at the time of recording information, and when all the MDs 20 have been recorded with information, The TOC is written.

Further, the TOC write determination unit 30 determines the timing for writing the TOC to all MDs 20.
It is decided by.

Next, the operation of the MD player having such a configuration will be described. FIG. 2 is for explaining the flow at the time of recording on the MD20. First, the TOC of the n-th MD20 is read and the information is recorded on the m-th MD20 which is an arbitrary disc. After being broken
When the recording of information on the mth MD 20 is completed, the system controller 10 stores the mth MD 2 in the memory 35.
The TOC to be recorded is stored in 0 (step 201,
202).

At the same time when the TOC is stored in the memory 35, the next MD20 is exchanged, information is continuously recorded, and when the recording is completed, the TOC to be recorded in the next MD20 is stored in the memory 35 as described above. (Step 20
3).

In this way, the MDs 20 are sequentially exchanged, the information is recorded on the exchanged MDs 20 and the TOC is stored in the memory 35, and when the writing of the information to be recorded is completed, the TOC writing determining unit 30 is completed. Is determined to be the last MD20, and this nth MD
When the recording of the information to the memory 20 and the storage of the TOC in the memory 35 are completed, the TOC is written to all the mth to nth MDs 20 (steps 204 and 2).
05). When the writing of the TOC to all MDs 20 is completed, the disc change operation is stopped (step 206).

FIG. 3 is for explaining the flow at the time of reproduction for the MD 20. First, the MD player 100
MD20 Ts for all n discs stored in
The OC is read and the arbitrary number of M-th M
After the information is reproduced to the D20, the mth MD20
When the reproduction of the information for the above is finished, it is exchanged to the next MD 20, and the reproduction of the information is continued (steps 301 to 301).
03). In this way, the MDs 20 are sequentially exchanged, it is determined that the MD 20 for which information should be reproduced is the nth MD 20, and when the reproduction of information for this MD 20 is completed, the disk change operation is stopped (steps 304, 30).
5).

As described above, in this embodiment, a plurality of MDs are used.
In the case of continuously recording information on 20, the TOCs of all MDs 20 are first read, and then an arbitrary number of m
Information recording is performed from the MD20 of the last MD to the MD20 of the last n, and the TOC to be written in each MD20 is stored in the memory 35.
When the write determination unit 30 determines that the MD20 is the last MD20, the TOCs are sequentially written to the mth to nth MD20.
MD2 within the maximum accumulation time (for example, within 3 seconds)
Since 0 can be exchanged, information can be continuously recorded on a plurality of MDs 20 without interruption, and information can be continuously reproduced without interruption even when a plurality of MDs 20 are continuously reproduced. it can.

FIG. 4 shows another embodiment in which the configuration of the MD player of FIG. 1 is changed, and the MD shown in FIG.
In the player 100, the DRA is detected by the free space detection unit 32.
When the free space is detected from the data storage amount of M12, the TOC write determining unit 31 determines the TOC write timing for each MD 20 according to the free space, as described later.

Next, the operation of the MD player having such a configuration will be described with reference to FIG. This figure is for explaining the flow at the time of recording on the MD20. First, the TOC of the n-th MD20 is read, and the recording of information on the m-th MD20, which is an arbitrary number, is completed. Then, the free space detection unit 32 detects the free space from the data storage amount of the DRAM 12 (steps 501 to 5).
03).

When it is determined that the free space is left for the time sufficient for TOC writing and disk replacement, the TOC writing determining unit 31 determines the TOC writing timing for the MD 20, and after the TOC is written. , The next MD20 is exchanged, and information is continuously recorded (steps 504 to 506).

On the other hand, if it is determined in (step 504) that the free space is not left for the time sufficient for writing the TOC, the TOC is not written to the MD 20 and the TOC is stored in the memory 35. Once stored, the next MD20 is exchanged.

In this way, the MDs 20 are sequentially exchanged, and information recording and TOC for the exchanged MDs 20 are performed.
Or the TOC is stored in the memory 35, and when the writing of the information to be recorded is completed, the TOC write determination unit 31 determines that the MD 20 is the last one, and the MD 20 in which the TOC is not written is All T
The writing of OC is sequentially performed, and when the writing of TOC to all MDs 20 is completed, the disk change operation is stopped (steps 507 to 509).

As described above, in this embodiment, a plurality of MDs are used.
When recording information for 20, first all MD
After reading 20 TOCs, information recording is sequentially performed from the mth MD20 to the last nth MD20, which is an arbitrary number, at the time when the information recording on each MD20 is finished. With the free space detection unit 32, the DRA
When the free space is detected from the data storage amount of M12 and it is determined that the free space is left for the time sufficient for TOC writing, the TOC write determination unit 31 determines the TOC write timing for the MD20. The TOC is written. On the other hand, the free space is T
When it is determined that there is not enough time left for writing the OC, the TOC is not written to the MD 20, the TOC is temporarily stored in the memory 35, and the information recording to all the MD 20 is completed. Then, the TOC corresponding to each MD 20 is written.

Therefore, at the time when the recording of the information on the MD 20 is finished, the TOC is surely written even if the free space of the DRAM 12 is reduced due to some reason, so that a plurality of MDs 20 can be written. Relay recording is reliably performed.

[0037]

As described above, in the disc recording apparatus according to the first aspect, during continuous recording on a plurality of discs, after the information recording on all the discs is completed, the discs are recorded on all the discs. Oita T stored in TOC storage means
By controlling the recording of the OC, it becomes possible to prevent the loss of the recorded information caused by the recording of the TOC.

Further, in the disc recording apparatus according to the second aspect, during continuous recording on a plurality of discs, when the information recording on each of the discs is completed, the free space of the information holding means writes the TOC. When there is more than enough time for exchanging time and the time for exchanging to the next disc, the TOC is written to the disc where the information recording is finished, and then the process is shifted to writing information to the next disc, TOC that did not write to the disc
Is stored in the TOC storage means, and is controlled to be recorded on the disc after the continuous recording of the information is completed.

Therefore, it becomes possible to prevent the loss of recorded information caused by recording the TOC, and when the information holding means has a free capacity, the TO
Since C is written, the total recording time can be shortened.

[Brief description of drawings]

FIG. 1 shows an embodiment in which the disc player of the present invention is applied to an MD player for recording / reproducing a digital signal to / from an MD.

FIG. 2 is a flowchart for explaining a recording operation of the MD player of FIG.

FIG. 3 is a flowchart for explaining a reproduction operation of the MD player of FIG.

FIG. 4 is a diagram showing another embodiment when the configuration of the MD player of FIG. 1 is changed.

5 is a flowchart for explaining a recording operation of the MD player of FIG.

[Explanation of symbols] 1 Spindle motor 2 magnetic head 3 Objective lens 4 Optical pickup 5 head drive circuit 6 Address decoder 9 EFM encoder / decoder 10 system controller 11 DRAM controller 12 DRAM 13 Data compression encoder / decoder 20 MD 21 Magneto-optical disk 22 cartridges 30, 31 TOC writing decision unit 32 Free space detector 35 memory 100 MD player

Continuation of the front page (56) Reference JP-A-6-162734 (JP, A) JP-A-7-29357 (JP, A) JP-A-5-234335 (JP, A) JP-A-2-281474 (JP , A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 27/00-27/06 G11B 27/10

Claims (4)

(57) [Claims] 1. A disc recording apparatus capable of continuously recording and reproducing information on a plurality of discs, and information holding means for holding a predetermined amount of information to be recorded on each disc, and for each disc. A TOC storage unit for storing the TOC to be written, and a free space detection unit for detecting a free space from the information storage amount of the information holding unit each time information recording on each of the plurality of disks is completed, The TOC is determined by determining whether or not the free space detected by the free space detection means remains for a predetermined time.
A disc recording apparatus comprising: a TOC write determination unit that determines a write timing of the TOC stored in the storage unit. 2. The TOC writing determining means, when determining that the free space is left for a predetermined time, controls the TOC writing means to write the TOC stored in the TOC storage means to the disk. Claim 1 characterized by
The described disk recording device . 3. The TOC writing determination means, when it is determined that the free space is not left for a predetermined time,
The disc recording apparatus according to claim 1, wherein the disc recording device is controlled so that the disc is replaced with a next disc. 4. The disk according to claim 1, wherein the predetermined time is a total of a time sufficient for writing the TOC and a replacement time for a next disk.
Recording device .