JP2002343027A - Information reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform reproduction free of stagnation. SOLUTION: The information reproduction method of reproducing a disk recorded with a plurality of different continuous compressed data, in which the bunches of the data from the respective tops to the prescribed numbers of the data in the different compressed data are recorded on the disk; in reproducing the compressed data, the bunches of the information from the respective tops to the prescribed numbers of the data in the different compressed data from the disk are read and are previously stored in memory means 13; in reproducing the compressed data of the same kinds, the onset segments of the prescribed number of data already stored in the memory means 13 are reproduced and the sequels of the compressed data of the same kind are reproduced from the disk and are successively supplemented and stored into the memory means 13, by which the compressed data of the same kind are continuously reproduced and the bunches of the data from the tops to the prescribed numbers of the data in the already stored different compressed data are stored in the memory means 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information reproducing method for reproducing music or the like using a small optical disk or a magneto-optical disk, for example.

[0002]

2. Description of the Related Art A disk system called a so-called mini disk (MD) for reproducing music or the like using, for example, a small optical disk or a magneto-optical disk has been proposed (see Japanese Patent Application No. 3-275067). .

[0003] Generally, a reproducing apparatus using a disk system is characterized in that the access such as so-called cueing is faster than when using a tape. However, in reality,
An access time such as a pickup transfer time is required, and the cueing usually takes about one second. However, in a reproducing apparatus using a disk system that is characterized by fast access, it is not preferable that such time is taken.

In the above-described mini disc (MD) reproducing apparatus, if the apparatus is configured to be portable, there is a possibility that the pickup may be disengaged from the reproduction track due to an impact during reproduction or the like and the reproduction may be interrupted. Therefore, in such a disk reproducing apparatus, a large-capacity memory (shock proof memory) is provided inside the disk reproducing apparatus until the servo returns to the original track even after the pickup comes off the reproducing track. The continuity of data is maintained using the stored data. The present invention has been made in view of such a point.

[0005]

The problem to be solved is that in a reproducing apparatus using a disk system, an access time such as a transfer time of a pickup is required, and it usually takes about one second to perform cueing. It is hanging.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an information reproducing method for reproducing a disk on which a plurality of different continuous compressed data are recorded. Is recorded, and when playing back the compressed data,
A set of information from a head to a predetermined number of data in different compressed data is read from the disk and stored in advance in the storage means, and when the compressed data is reproduced, the beginning of the predetermined number of data stored in the storage means is read. At the same time as the reproduction, the continuation of the same type of compressed data is reproduced from the disc and sequentially stored in the storage means, whereby the same type of compressed data is continuously reproduced, and the different types of compressed data stored in the storage means are read out. An information reproducing method characterized by holding a group of data up to a predetermined number of data from the head.

[0007] According to this, when reproducing the compressed data, by reproducing the beginning portion of the predetermined number of data stored in the storage means, it is possible to perform reproduction without delay.

[0008]

FIG. 1 shows the overall configuration of the apparatus.
In FIG. 1, reference numeral 1 denotes a read-only optical disk or a mini disk (MD) composed of a recordable / reproducible magneto-optical disk. The mini disc (MD) 1 has a plurality of independent data recorded thereon. At the time of reproduction, data recorded on the mini disc (MD) 1 is reproduced by the optical pickup 2, and the reproduction data from the optical pickup 2 is transmitted through the RF amplifier 3 to, for example, 8-14 conversion (EFM) and error correction. The encoding (CIRC) is supplied to the encoder / decoder circuit 4.

The reproduction data from the RF amplifier 3 is supplied to the address decoder 5 and the mini disc (MD) 1
The cluster number corresponding to the above absolute address is determined. The determined cluster number from the address decoder 5 is supplied to the system control CPU 6 through the encoder / decoder circuit 4. A signal from the operation keys 7 is supplied to the CPU 6 to control the entire apparatus, and a control state and the like are displayed on the display unit 8. The signal from the CPU 6 is supplied to the feed motor 10 of the optical pickup 2 and the spindle motor 11 of the mini disk (MD) 1 through the servo circuit 9, and these signals are controlled and driven. Thus, the optical pickup 2 is moved to a recording area on the mini disc (MD) 1 where desired data is recorded.

The reproduced data decoded by the encoder / decoder circuit 4 is stored in a shock-proof memory.
The data is written to a large capacity DRAM (shock proof memory) 13 through the controller 12. Further CP
Communication is performed between U6 and the controller 12, and this D
Reproduction data is read from a predetermined position in the RAM 13. Note that reading is slower than writing, so DRAM
When the data amount of No. 13 reaches a predetermined value, the writing is temporarily stopped.

Further, reproduction data read from the DRAM 13 is supplied to an ATRAC encoder / decoder circuit 14 for audio compression, and the reproduction data decoded by the circuit 14 is supplied to a D / A converter circuit 15. Then, the signal converted into an analog signal by the circuit 15 is output to, for example, an audio signal output terminal 16. Thus, the data recorded on the mini disc (MD) 1 is reproduced.

On the other hand, at the time of recording, a magneto-optical disk capable of recording and reproduction is used as the mini disk (MD) 1. Reference numeral 17 denotes, for example, an input terminal of an audio signal.
The digital recording data is supplied to the / D converter circuit 18 to form digital recording data. The recorded data is
The encoder signal is supplied to the decoder circuit 14, and the encoder signal from the circuit 14 is supplied to the DRAM 13 through the controller 12.

When a predetermined amount of recording data is stored in the DRAM 13, the recording data is read out and recorded. That is, from the DRAM 13 to the controller 12
Is supplied to the encoder / decoder circuit 4, and the encode signal from the circuit 4 is supplied to the head drive circuit 19. As a result, the magnetic field of the recording head 20 is changed, and this change in the magnetic field is minimized.
The disk (MD) 1 is supplied from the upper surface side. Also CP
The signal from U6 is supplied to the optical pickup 2 through the servo circuit 9, and the laser is irradiated from the lower surface of the mini disc (MD) 1 at a predetermined timing. In this manner, recording of the audio signal from the input terminal 17 is performed.

Further, in this apparatus, reference numeral 21 denotes a TOC memory, which indicates information (T) indicating the recording status of data recorded in the lead-in area on the mini disc (MD) 1.
OC: Table Of Contents) is read and recorded. That is, for example, when there is a recording area of recording data as shown in FIG. 2A, the information (TOC) indicating the recording status at this time is as shown in FIG.

In FIG. 1, an area A is an area in which the correspondence between the number of the recorded data and the address of the information on the recording status is recorded. The area B is composed of, for example, 255 addresses, and is an area in which information of a recording area of each data is recorded at each address.

In the area A, for example, the address of information on all recording areas is stored in the first byte "0".

[00] _H
Is recorded, and the address of the information in the first recording area of each data is sequentially recorded for each of the following bytes. That is, in the state of FIG. 2A described above, the address [01] _H of the information of the data recording area is recorded in the byte “1”,
The address [02] _H of the information of the data recording area is recorded in the byte “2”, and the address [03] _H of the information of the data recording area is recorded in the byte “3”.

On the other hand, in the area B, the address [0
0] First and second bytes of _H are cluster numbers at the beginning of all recording areas

[0000] _H is recorded, and information indicating that the immediately preceding number is the start end in the third byte

[00] _H is recorded, and information indicating the mode is recorded in the fourth byte. In the fifth and sixth bytes, a cluster number [****] _{H at} the end of the entire recording area is recorded, and in the seventh byte, information [1F] _H indicating that the immediately preceding number is the end is recorded, 8th
Information that there is no following recording area in the byte

[00]
_H is recorded. This address

[00] The information of _H is usually recorded in fixed pits that are not rewritten.

In the addresses [01] _H to [03] _H , the first and second bytes respectively include the cluster number of the start end of the recording area of data.

[0000] _H [021
3] _H [03D6] Information indicating that _H is recorded, and the last byte is the start end in the third byte

[00] _H is recorded, and information indicating the mode is recorded in the fourth byte. In the fifth and sixth bytes, respectively, the cluster number [01C3] _H [0383] _{H at} the end of the recording area of data
[0545] _H is recorded, and information [1F] _H indicating that the last number is the end is recorded in the seventh byte, and the eighth byte is recorded.
Information that there is no following recording area in the byte

[00]
_H is recorded.

In this apparatus, when the mini disc (MD) 1 is mounted during the standby for reproduction, the operation shown in FIG. 4A is performed. That is, in the figure, when the mini disc (MD) 1 is loaded in step [1], TOC data is read in step [2], and in step [3], a predetermined amount at the beginning of each data is set as a shock proof. The data is written to the memory (DRAM 13). Further, in step [4], it is determined whether or not N data has been written. If not, the process returns to step [3]. When it reaches, the next step is performed.

As a result, as shown in FIG. 2B, a predetermined amount at the head of each data is read out, and the shock proof
In the memory (DRAM 13), for example, as shown in FIG. The arrow is a pointer indicating the head position of each written data.

On the other hand, when a selection is made during reproduction,
The operation shown in FIG. 4B is performed. That is, in the figure,
In step [5], the process waits until a selection is made. When the selection is made in step [5], step [6]
Then, the read pointer of the DRAM 13 is moved to the pointer at the head position of the selected data, and reading is performed. Further, in step [7], the next data is accessed, and in step [8], the write pointer is moved to the pointer at the head position of the selected next data, and writing is performed.

That is, the shock proof memory (D
From the RAM 13), for example, reading is performed from the read pointer R at the head position of the selected data shown in FIG. 5B, and writing is performed from the write pointer W at the head position of the selected next data. .

Thus, according to the above-described apparatus, the head portion is taken out from the memory (DRAM 13), and during this time, the next data is accessed and the subsequent reproduction is performed.
Reproduction without delay can be performed.

In the above-described device, the predetermined amount at the beginning of each data to be written into the shock proof memory (DRAM 13) only needs to be long enough to allow the next data to be accessed (several seconds). In the above-described apparatus, the mini disc (MD) reproducing apparatus is provided with a large-capacity shock-proof memory (DRAM 13) in advance, so that the present invention can be implemented without adding a new hardware configuration or the like. Is what you can do.

[0025]

According to the present invention, it is possible to perform the reproduction without delay by taking out the head portion from the memory, accessing the next data during this time and performing the subsequent reproduction.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an example of a disc reproducing apparatus to which a reproducing method according to the present invention is applied.

FIG. 2 is a diagram for explaining the status of data.

FIG. 3 is a diagram for explaining information (TOC) indicating the status of data.

FIG. 4 is a flowchart for explaining the operation.

FIG. 5 is a diagram for explaining storage of a shock-proof memory.

[Explanation of symbols]

1 mini disk (MD), 2 optical pickup, 3 RF amplifier, 4 8-14 conversion (EFM)
And error correction coding (CIRC) encoder / decoder circuit, 5 address decoder, 6 system control CPU, 7 operation keys, 8 display unit, 9
Servo circuit, 10 feed motor, 11 spindle motor, 12 shock-proof memory controller, 13 DRAM (shock-proof
Memory), 14 ATRAC encoder / decoder circuit for audio compression, 15 D / A converter circuit, 16
{For example, an audio signal output terminal, 17} for example, an audio signal input terminal, 18 {A / D converter circuit, 19} head drive circuit, 20} recording head,
21 @ TOC memory

Claims (1)

[Claims] 1. An information reproducing method for reproducing a disk on which a plurality of different continuous compressed data are recorded, wherein a set of data from a head of each of the different compressed data to a predetermined number of data is recorded on the disk. In reproducing the compressed data, a set of information from a head to a predetermined number of data in each of the different compressed data is read from the disk and stored in a storage means in advance. The same kind of compressed data is continuously reproduced and stored by reproducing the beginning part of the stored predetermined number of data and reproducing the continuation of the same kind of compressed data from the disc and sequentially supplementing and storing the same in the storage means. Means for holding a set of data from the beginning of the different types of compressed data stored in the means up to a predetermined number of data. Information reproduction method to be used.