JPH05266591A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To execute a reproduction without delay. CONSTITUTION:When a mini-disk(MD) 1 is loaded on standby for a reproduction, TOC data on the mini-disk(MD) 1 is read in and the specified quantity of the leading part of each data on the mini-disk(MD) 1 is written into a shock proof memory(DRAM 13). Then, when a selection is made at the time of the reproduction, the reading pointer of the DRAM 13 is moved to a pointer on the position of the leading part of the selected data and a reading-out is executed. Further, next data on the mini-disk(MD) 1 is accessed, the writing pointer of the DRAM 13 is moved to a pointer on the position of the leading part of the next selected data and a writing is operated.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art For example, a disc system called a so-called mini disc (MD) has been proposed in which a small optical disc or a magneto-optical disc is used to reproduce music (see Japanese Patent Application No. 3-275067). ..

In general, a reproducing apparatus using a disk system is characterized in that access such as so-called cueing is quicker than that when a tape is used. However, in reality,
Access time such as transfer time of the pickup is required, and it usually takes about 1 second to find the head. However, it is not preferable that such a time is taken in a reproducing apparatus using a disc system characterized by fast access.

In the above-mentioned mini disk (MD) reproducing apparatus, if the apparatus is constructed as a portable type, there is a possibility that the pickup may be disengaged from the reproducing track due to a shock during reproduction and the reproduction may be interrupted. Therefore, in such a disc reproducing device, a large-capacity memory (shock proof memory) is provided inside, and even if the pickup comes off the reproducing track, this memory is kept until it returns to the original track by the servo. The stored data is used to maintain the continuity of the data. The present invention has been made in view of these points.

[0005]

The problem to be solved is that a reproducing apparatus using a disk system requires access time such as transfer time of a pickup, and usually about 1 second is required for cueing. It is hanging.

[0006]

According to the present invention, a memory 1 for maintaining the continuity of the above-mentioned data reproduced at the time of reproduction is recorded on a disc 1 on which a plurality of independent data are recorded.
In the disc reproducing apparatus in which the data is reproduced through this memory, the memory (DRAM 13) is made to store only the head portion of each of the plurality of independent data by a predetermined amount in the memory (DRAM 13).
U6) is a disc reproducing apparatus which, when the data to be reproduced is selected, takes out the first portion from the memory and then reproduces the next portion through the memory.

[0007]

According to this, the head portion is taken out from the memory, the next data is accessed during this time, and the subsequent reproduction is performed, whereby reproduction without delay can be performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows the overall construction of the apparatus. In this figure, 1 is, for example, a read-only optical disk or a mini disk (M
D). A plurality of independent data are recorded on this mini disc (MD) 1. At the time of reproduction, the 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 passed through the RF amplifier 3 to, for example, 8-14 conversion (EFM) and error correction. Coding (CIR
It is supplied to the encoder / decoder circuit 4 of C).

The reproduced data from the RF amplifier 2 is also supplied to the address decoder 5, and the mini disk (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 key 7 is supplied to the CPU 6 to control the entire apparatus, and the 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 disc (MD) 1 through the servo circuit 9, and these signals are controlled and driven. As a result, the optical pickup 2 is moved to the recording area on the mini disc (MD) 1 in which desired data is recorded.

The reproduced data decoded by the encoder / decoder circuit 4 is stored in the shock proof memory.
It is written in 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
The reproduction data is read from a predetermined position in the RAM 13. Since reading is slower than writing, DRAM
When the data amount of 13 reaches a predetermined value, writing is temporarily stopped.

Further, the reproduced data read from the DRAM 13 is supplied to the ATRAC encoder / decoder circuit 14 for audio compression, and the reproduced data decoded by the circuit 14 is supplied to the D / A converter circuit 15. The signal analogized by the circuit 15 is taken out to, for example, the output terminal 16 of the audio signal. In this way, the data recorded on the mini disc (MD) 1 is reproduced.

On the other hand, at the time of recording, a recordable / reproducible magneto-optical disk is used as the mini disk (MD) 1. Reference numeral 17 designates an audio signal input terminal, and the audio signal from this input terminal 17 is A
It is supplied to the / D converter circuit 18 to form digital recording data. This recorded data is encoder /
It is supplied to the decoder circuit 14, and the encode signal from this circuit 14 is supplied to the DRAM 13 through the controller 12.

When a predetermined amount of print data is stored in the DRAM 13, the print data is read and printing is performed. That is, from the DRAM 13 to the controller 12
The recording data read through is supplied to the encoder / decoder circuit 4, and the encode signal from this 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 magnetic field is
It is supplied from the upper surface side of the disc (MD) 1. Also CP
A signal from U6 is supplied to the optical pickup 2 through the servo circuit 9, and a laser is emitted from the lower surface side of the mini disc (MD) 1 at a predetermined timing. In this way, the audio signal from the input terminal 17 is recorded.

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

In this figure, 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 the information of the recording area of each data is recorded at each address.

In the area A, for example, in the first byte "0", the address of information on the entire recording area

[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, the address [01] _H of the information of the data recording area is recorded in the byte “1”,
The information address [02] _H of the data recording area is recorded in the byte “2”, and the information address [03] _H of the data recording area is recorded in the byte “3”.

On the other hand, in the area B, the address [0
0] The cluster number of the start edge of the entire recording area in the first and second bytes of _H

[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. Also, the cluster number [***] _{H at} the end of the entire recording area is recorded in the 5th and 6th bytes, and the information [1F] _H indicating that the immediately preceding number is the end is recorded in the 7th byte. 8th
An information data [0
0] _H is recorded. This address

[00] _H information is normally recorded in fixed pits that are not rewritten.

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

[0000] _H [021
3] _H [03D6] _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. Further, the cluster number [01C3] _H [0383] _{H at} the end of the recording area of data in the fifth and sixth bytes
[0545] _H is recorded, information [1F] _H indicating that the immediately preceding number is the end is recorded in the 7th byte, and the 8th
Information indicating that there is no subsequent recording area in the byte

[00]
_H is recorded.

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

As a result, as shown in FIG. 2B, the predetermined amount at the beginning of each data is read, and shock proof
For example, as shown in A of FIG. 5, a predetermined amount of the beginning of each data is written in the memory (DRAM 13). The arrow is a pointer indicating the position of the beginning of each written data.

On the other hand, if selection is made during reproduction,
The operation shown in B of FIG. 4 is performed. That is, in the figure,
It waits until selection is made in step [5]. 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 the 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 next selected data. ..

In this way, according to the above-mentioned device, the leading portion is taken out from the memory (DRAM 13), the next data is accessed during this period, and the subsequent reproduction is performed.
It is possible to perform reproduction without delay.

In the above-mentioned device, the predetermined amount at the beginning of each data written in the shock proof memory (DRAM 13) may be a length (several seconds) that allows the next data to be accessed. Further, in the above-described device, since a mini disk (MD) reproducing device is provided with a large-capacity shock proof memory (DRAM 13) in advance, the present invention is implemented without adding a new hardware configuration or the like. Is something that can be done.

[0025]

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

[Brief description of drawings]

FIG. 1 is a block diagram of an example of a disc reproducing apparatus according to the present invention.

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

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

FIG. 4 is a flow chart 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 (CIR)
C) Encoder / decoder circuit 5 Address decoder 6 CPU for system control 7 Operation keys 8 Display section 9 Servo circuit 10 Feed motor 11 Spindle motor 12 Shock proof memory controller 13 DRAM (Shock proof memory) 14 Voice ATRAC encoder / decoder circuit for compression 15 D / A converter circuit 16 For example, audio signal output terminal 17 For example, audio signal input terminal 18 A / D converter circuit 19 Head drive circuit 20 Recording head 21 TOC memory

Claims (4)

[Claims] 1. A disc having a plurality of independent data recorded discs, provided with a memory for maintaining continuity of the data reproduced at the time of reproduction, and the reproduction being performed through this memory. In the playback device, during playback standby, only the leading portion of each of the plurality of independent data is stored in the memory by a predetermined amount, and when the data to be played back is selected, the leading portion is retrieved from the memory. After that, the disc reproducing device is adapted to reproduce the next portion through the memory. 2. Information indicating the recording status of the data is recorded in the lead-in area of the disc, and this information is used to store a predetermined amount of each head portion of the plurality of independent data. The disc reproducing apparatus according to claim 1, wherein 3. The disc reproducing apparatus according to claim 1, wherein the disc is a read-only optical disc. 4. The disc reproducing apparatus according to claim 1, wherein the disc is a magneto-optical disc capable of recording and reproducing.