JP2001266475A - Optical disk reproducing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fetch the effective data of presentation information out of a primary memory means with relatively simple constitution and to output the data to an expansion means. SOLUTION: In reproducing MP 3 data, a microcomputer 24 controls an optical disk reading section 2 to have a multiplicity of continuous block information constituting the presentation information of desired music read from a CD-R 1A to be stored in a DRAM 10, transfers only the effective data in the block information of one block from the DRAM 10 to one empty side of two buffer memory regions 201 and 202 respectively having a capacity for one block provided on a RAM 22 and successively outputs the effective data in parallel with the transfer from the other already transferred side to an MP 3 decoder 22. When the other side is emptied, the microcomputer transfers the effective data for the next one block from the DRAM 10 to another side the buffer memory regions 201 and 202 and outputs the data from another side to the decoder 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk reproducing apparatus, and more particularly, to an optical disk reproducing apparatus for reproducing an optical disk on which compressed format presentation information such as compressed music data and compressed moving image data is divided into blocks and recorded.

[0002]

2. Description of the Related Art A CD-R (compact disk-recordable) which is an additional type optical disk on which a user can record while recording a large amount of arbitrary information such as computer data.
Optical disk has appeared. Various data can be recorded on this optical disc in accordance with the format of a CD-ROM, instead of music data of a CD (compact disc). On a CD-ROM,
One block (one physical sector) is composed of 98 subcode frames of the CD, and one block is 2352 bytes. Of these, the first 16 bytes are header information, which is composed of a synchronization signal and an ID signal (address + mode).
The following 2048 bytes (mode 1) or 2336 (mode 2) is valid data, and in the case of mode 1, the remaining 288 bytes are error detection / correction codes (ECC). FIG. 7 shows the CD-ROM format of mode 1.

FIG. 8 shows a configuration of a general optical disk reproducing apparatus. 1 is an optical disk recorded in a CD-ROM format, 10 is a storage capacity of 90 blocks (90 × 2
Large-capacity buffer memory (DRA with 352 bytes)
M), 2 reads desired recording information on the optical disc 1,
A spindle motor 3 for rotating the optical disk 1, which is an optical disk reading unit for temporarily storing data in the DRAM 10;
An optical pickup 4 for irradiating the optical disc 1 with a laser beam, receiving a reflected beam, photoelectrically converting and outputting the reflected beam, a thread motor 5 for feeding a thread of the optical pickup 4, an EFM signal from the output of the optical pickup 4, a focus error signal, The head amplifier 6 for creating a tracking error signal, etc., creates a CLV control signal from an EFM signal,
A signal processing circuit 7 for reading and outputting a subcode or reading block information in block units and storing the block information in a DRAM 10; a spindle motor 3 based on a focus error signal, a tracking error signal, and a CLV control signal;
A servo circuit 8 for performing various servos such as a spindle servo for the optical pickup 4, a focus servo and a tracking servo for the optical pickup 4, and a thread servo for the thread motor 5, and a controller 9 for controlling each unit of the optical disk reading unit in accordance with instructions of a microcomputer described later.

When an address search command for certain block information is received from the microcomputer 11 which has received a request from the host, the controller 9 causes the optical disk reading section 2
The servo circuit 8 and the signal processing circuit 7 are controlled to search for a desired address of the optical disk 1 while monitoring the subcode Q channel read by the signal processing circuit 7. After the search, 90 consecutive blocks after the desired address are searched. The block information of one minute (one block information is composed of 2354 bytes of header information, valid data (user data), and ECC; see FIG. 7) is read and temporarily stored in the DRAM 10. When the reading of the block information for 90 blocks is completed, the controller 9 outputs a reading completion notification signal to the microcomputer 11, and the microcomputer 11 receiving the reading completion notification signal outputs the reading completion notification signal to the controller 9.
Is given to the host, and a transfer start request is made to the host.
Are sequentially transferred to the host side. The controller 9 that has received the pause command sends the servo circuit 8
And the signal processing circuit 7 to bring the apparatus into a pause state.

The microcomputer 11 includes a DRAM 10
Is monitored for free space, and when a certain amount of space is available,
A pause release command is given to the controller 9. Upon receiving the pause release command, the controller 9 controls the servo circuit 8 and the signal processing circuit 7 to release the pause, and fills the DRAM 10 with the block information of each successive block from the address next to the last read address. Read until it is. When the DRAM 10 is full, the microcomputer 11 gives a pause command again to interrupt reading from the optical disc 1, and then gives a pause release command when a certain amount of free space is left in the DRAM 10, and resumes reading from the optical disc 1 again. Thereafter, the same control is repeated.

[0006]

However, in recent years, MP3
Compressed music data in a format called (MPEG1 audio-layer 3) is stored in a semiconductor memory, MP3 data is read from the semiconductor memory, input to an MP3 decoder, decompressed, and D / A converted to an analog audio signal. A portable player has been put to practical use in which the signal is amplified and output to an earphone after amplification. However, the semiconductor memory is very expensive if it has a large capacity, and there is an inconvenience that a large number of music pieces cannot be recorded. In this regard, C
Since the DR is an inexpensive and large-capacity medium, a large number of songs can be reproduced by recording the MP3 data on the CD-R. However, in the conventional CD-ROM reproducing device, the CD
-Since only block information according to the ROM format is read, even if the read block information is directly input to a conventional MP3 decoder, it cannot be decompressed and music cannot be reproduced. The present invention has been made in view of the above-described problems of the related art, and has as its object to provide an optical disc reproducing apparatus capable of extracting compressed effective data of presentation information with a relatively simple configuration and outputting the data to a decompression unit. .

[0007]

In the optical disk reproducing apparatus according to the first aspect of the present invention, for an optical disk on which predetermined presentation information in a compressed format is divided and recorded in block units, continuous block information after a desired block is obtained. And an optical disc reading means for reading the block information of n (n is an integer of several tens or more) blocks into a primary storage means capable of storing the block information,
A first secondary storage unit and a second secondary storage unit capable of storing valid data for a block, a decompression unit for inputting valid data of predetermined presentation information in a compressed format, decompressing and outputting, and an optical disk The reading unit is controlled and stored in the primary storage unit while reading a plurality of continuous block information including the desired presentation information from the optical disk, and the desired block including the desired presentation information is stored in the primary storage unit. Reading / transfer control means for transferring valid data in the information to the empty side of the first secondary storage means and the second secondary storage means by m blocks, and the first secondary storage means Alternatively, in the second secondary storage means, the valid data of the presentation information stored on one side previously transferred is output to the decompression means, and When one side becomes empty, the validity data of the presentation information stored on the other side is output to the decompression means, and when the other side becomes free, the validity data of the presentation information stored on the one side is decompressed. And output control means for repeating the control of causing the output to occur. According to the first aspect, at the time of presentation information reproduction, only effective data is extracted from the block information of a large number of continuous blocks including the desired presentation information read from the optical disk and stored in the primary storage means and output to the decompression means. Therefore, the decompression operation can be correctly performed by the decompression means. In addition, two secondary storage units each having a much smaller capacity than the primary storage unit are prepared, and while valid data is transferred from the primary storage unit to one of the secondary storage units, the secondary storage unit that has already been transferred from the other primary storage unit is prepared. Since valid data is output from the next storage means to the decompression means, valid data can be output without interruption while reducing the load on the storage means. In the optical disk reproducing apparatus according to claim 2 of the present invention,
For an optical disk on which predetermined presentation information in a compressed format is divided and recorded in block units, continuous block information after a desired block is read, and n
(N is an integer of several tens or more) optical disk reading means for storing the block information of the block information in the primary storage means, and first secondary storage means capable of storing the effective data of m blocks each smaller than n And second secondary storage means, decompressing means for inputting valid data of predetermined presentation information in a compressed format, decompressing and outputting the data, and controlling the optical disc reading means to continuously read the desired presentation information from the optical disc. While the plurality of block information is read and stored in the primary storage means, the effective data in the desired block information including the desired presentation information, which is stored in the primary storage means, is divided into the first secondary data by m blocks. Of the storage means and the second secondary storage means,
A read / transfer control process for transferring data to the idle side;
In the first secondary storage means or the second secondary storage means, the valid data of the presentation information stored on one side previously transferred is output to the decompression means, and when the one side becomes empty, The control is such that valid data of the presentation information stored on the other side is output to the decompression means, and when the other side becomes empty, the valid data of the presentation information stored on the one side is output to the decompression means. And a microcomputer that executes a repetitive output control process. Claim 2
According to the present invention, at the time of presentation information reproduction, only effective data can be extracted from the block information of a large number of continuous blocks including the desired presentation information read from the optical disk and stored in the primary storage means, and can be output to the decompression means. The decompression operation can be correctly performed by the decompression means. In addition, two secondary storage units having a much smaller capacity than the primary storage unit are prepared, and valid data is transferred from the primary storage unit to one of the empty secondary storage units, while the other is already transferred from the primary storage unit. Since the valid data is output from the secondary storage means to the decompression means, it is possible to output the valid data without interruption while reducing the load on the storage means. Also, read control for the optical disk reading means, transfer control of the effective data in the desired block information from the primary storage means to the two secondary storage means, output of the presentation information effective data from the two secondary storage means to the decompression means Since control can be performed using a microcomputer, it is not necessary to create a dedicated control IC. In the optical disk reproducing apparatus according to the third aspect of the present invention, continuous block information subsequent to a desired block is read from an optical disk on which predetermined presentation information and predetermined management information in a compressed format are separately recorded in block units. An optical disk reading means for storing the block information of n (n is an integer of several tens or more) blocks in a primary storage means, and a first storage means for storing m blocks of valid data each smaller than n. A secondary storage unit, a second secondary storage unit, a decompression unit for inputting valid data of predetermined presentation information in a compressed format, decompressing and outputting the data, and controlling an optical disk reading unit. From the primary storage unit while reading a plurality of continuous block information including desired management information from the The valid data in the block information including the desired management information stored in the primary storage means is converted into the unanalyzed valid data in the first secondary storage means and the second secondary storage means by m blocks. The data is transferred to the non-existent side, and at the time of presentation information reproduction, the plurality of continuous block information including the desired presentation information are read from the optical disk and stored in the primary storage means while the primary information is stored in the primary storage means. Reading / transfer control means for transferring valid data of desired block information including desired presentation information to the free side of the first secondary storage means and the second secondary storage means by m blocks; At the time of analyzing the management information, analyzing the unanalyzed valid data stored in the first secondary storage means or the second secondary storage means to obtain a desired presentation Analyzing means for determining the recording position of the information, and validating data of the presentation information stored in one of the first secondary storage means and the second secondary storage means which was previously transferred when reproducing the presentation information. When the one side becomes empty, the validity data of the presentation information stored in the other side is output to the expander, and when the other side becomes empty, the data is stored in the first side. Output control means for repeating the control of outputting the effective data of the presentation information to the decompression means. According to the third aspect, at the time of presentation information reproduction, only valid data is extracted from the block information of a large number of continuous blocks including the desired presentation information read from the optical disk and stored in the primary storage means, and output to the decompression means. Therefore, the decompression operation can be correctly performed by the decompression means. In addition, two secondary storage units each having a much smaller capacity than the primary storage unit are prepared, and while valid data is transferred from the primary storage unit to one of the secondary storage units, the secondary storage unit that has already been transferred from the other primary storage unit is prepared. Since valid data is output from the next storage means to the decompression means, valid data can be output without interruption while reducing the load on the storage means. When analyzing the management information, only valid data is extracted from the block information containing the desired management information read from the optical disk and stored in the primary storage means, and the unanalyzed valid data is read out of the two secondary storage means. Since the data is transferred to the side having no data and analyzed, there is no need to prepare a separate storage means for the analysis, and the load on the storage means is minimized. In the optical disk reproducing apparatus according to the fourth aspect of the present invention, continuous block information after a desired block is read for an optical disk in which predetermined presentation information and predetermined management information in a compression format are separately recorded in block units. An optical disk reading means for storing the block information of n (n is an integer of several tens or more) blocks in a primary storage means, and a first storage means for storing m blocks of valid data each smaller than n. Secondary storage means and second secondary storage means;
Controlling the decompression means for inputting the valid data of the predetermined presentation information in the compression format, decompressing and outputting, and the optical disk reading means. When analyzing the management information, a plurality of pieces of continuous block information including the desired management information from the optical disk While the primary data is stored in the primary storage device, the effective data in the block information including the desired management information stored in the primary storage device is stored in the first secondary storage device and the second Of the secondary storage means, the data is transferred to the side where no unanalyzed valid data exists. At the time of presentation information reproduction, a plurality of continuous block information including desired presentation information are read from the optical disk and stored in the primary storage means. On the other hand, the effective data of the desired block information including the desired presentation information stored in the primary storage means is stored. Read / transfer control processing for transferring the data to the empty side of the first secondary storage means and the second secondary storage means by m blocks, and the first secondary storage means for analyzing the management information. Means for analyzing the unanalyzed valid data stored in the means or the second secondary storage means to determine the recording position of the desired presentation information, and the first secondary storage means or the second storage means for reproducing the presentation information. Of the secondary storage means, the validity data of the presentation information stored on one side previously transferred is output to the decompression means, and when the one side becomes empty, the validity of the presentation information stored on the other side becomes valid. Data is output to the decompression means, and when the other side becomes empty, control is performed to output valid data of the presentation information stored in the one side to the decompression means. It is characterized by comprising a microcomputer, a to perform an output control process of returning. According to the fourth aspect, at the time of presentation information reproduction, only effective data is extracted from the block information of a large number of continuous blocks including the desired presentation information read from the optical disk and stored in the primary storage means, and output to the decompression means. Therefore, the decompression operation can be correctly performed by the decompression means. Moreover,
Two secondary storage units, each having a much smaller capacity than the primary storage unit, are prepared, and while valid data is transferred from the primary storage unit to one of the secondary storage units, the secondary storage unit already transferred from the other primary storage unit. Since the effective data is output from the means to the decompression means, the effective data can be output without interruption while reducing the load on the storage means. When analyzing the management information, only valid data is extracted from the block information containing the desired management information read from the optical disk and stored in the primary storage means, and the unanalyzed valid data is read out of the two secondary storage means. Because it was transferred to the side without the analysis, there was no need to prepare a separate storage means for analysis,
The burden on the storage means is minimal. Also, read control for the optical disk reading means, transfer control of valid data in desired block information from the primary storage means to the two secondary storage means, analysis of management information, presentation information from the two secondary storage means to the decompression means The output control of the effective data can be controlled using a microcomputer.
There is no need to create a dedicated control IC. In the above-described claims 1 to 4, m is much smaller than n, for example, 1
It may be an integer of about 5 to 5, preferably 1 or 2.

[0008]

FIG. 1 is a block diagram showing the configuration of an optical disk reproducing apparatus according to one embodiment of the present invention. The same components as those in FIG. 8 are denoted by the same reference numerals. Reference numeral 1A denotes a CD-R, which is a kind of optical disk, and in the program area, presentation information in a compressed format (here, MP3 data, which is one of the compressed music data) and a CD-R1A of the presentation information. Mode 1 CD with management information for managing the recording position
-Recorded by a large number of block information divided into blocks according to the ROM format. The block information of each block is valid data (MP3 data) of presentation information and header information (synchronization signal + ID signal).
And error detection / correction code (ECC), or valid data of management information, header information and error detection / correction code, and the data length of one block information is 235.
2 bytes. As shown in FIG. 2, it is assumed here that the management information is recorded in the first management information recording area of the program area, and the presentation information is recorded in music units. In FIG. 2, the address of the next block is represented by a number larger by one than the address of a certain block.

The management information includes a song-specific management information table prepared for each song, and a song-specific management information table pointer indicating which song's song management information table is recorded in which block. The song-specific management information table pointer exists at the first part of the management information recording area. The recording start position (start address) and the recording end position (end address) of the presentation information of the song number i on the CD-R1A are recorded in the song-specific management information table for the song number i.

[0010] 20 denotes a RAM which is read and write by the microcomputer to be described later, each 1 first secondary buffer memory region 20 ₁ having a block of valid data can be stored a memory capacity (2048 bytes), the second the secondary buffer memory region 20 ₂ is provided. An operation unit 21 allows the user to perform a music selection operation, and an MP3 decoder 22 constituted by a DSP (Digital Signal Processor) expands MP3 data and outputs digital audio data. Reference numeral 23 denotes a D / A converter for D / A converting digital audio data and outputting an analog audio signal.
/ A conversion circuit.

A microcomputer 24 controls the overall operation of the apparatus.
The optical disk reading unit 2 is controlled to read desired management information or desired presentation information.
An optical disk reading control process to be stored in M10;
First from RAM 10 RAM 20, and transfer control processing of the second to the buffer memory area _{20 1, 20 2, CD-} R1
And analysis of the desired management information read from A, the 1, MP of the valid data of a desired presentation information stored second buffer memory region 20 _1, 20 ₂
Output control processing to the three decoders 22 is performed. The other components in FIG. 1 are the same as those in FIG. 8, and a large-capacity DRAM 10 having a storage capacity of 90 blocks has a function as a primary storage unit.

FIGS. 3 and 4 are flowcharts showing main processing (including optical disk reading control processing and management information analysis processing) by the microcomputer 24, and FIGS. 5 and 6.
Is a flowchart showing sub-processing (including optical disk reading control processing) by the microcomputer 24, which will be described below with reference to these drawings. The main processing and the sub-processing are executed in parallel by time division.
Initially, the DRAM 10 is assumed to be empty.

(1) Reading and Analysis of Management Information When the user performs a music selection operation of, for example, music number 2 on the operation unit 21, the microcomputer 24 executes the main address shown in FIGS. A'and a (see FIG. 2) is, first, after setting the second secondary buffer memory region 20 _1, 20 e indicating whether the ₂ and f each 1 and 2, address A' Is instructed to the sub-process to read the block information and transfer it to the _first secondary buffer memory area 201 (steps S10 to S in FIG. 3).
12). Subsequently, A ′ is incremented and the address A
'(= A + 1) for instructing transfer to a read-second secondary buffer memory region 20 _second side of the block information to the sub-processing of (step S13, S14). Then, it waits until block information (only valid data) is transferred to the _first secondary buffer memory area 201 (step S1).
5).

In the sub-processes shown in FIGS. 5 and 6, when reading / transfer of block information at address A 'is instructed in the main process, "YES" is determined in the step S50, and the DRAM 10
It is checked whether or not there is block information of the address designated this time (step S51). Since it is initially NO, the DRAM 10 is cleared (step S5).
2), a search command for the address A 'is given to the optical disk reading unit 2 to read the block information of the blocks BL ₀ , BL ₁ , BL ₂ ,... For 90 consecutive blocks after the address A' (step S53). ). The optical disk reading unit 2 which has received the search command from the microcomputer 24 searches for the address A 'of the CD-R 1A, and after the search, reads the block information for 90 consecutive blocks after the address A' and temporarily stores it in the DRAM 10. After that, a read completion notification signal is output to the microcomputer 24. The microcomputer 24 that has received the read completion notification signal determines that reading of 90 blocks has been completed, determines YES in step S54, and gives a pause command to the optical disk reading unit 2 to pause (step S55).

[0015] Then, to transfer only valid data in the block information of a block BL ₀ of the specified address A'= A in this read-transfer instruction, the first secondary buffer memory region 20 ₁ designated (Step S56).
Then, the free space of the DRAM 10 is monitored to check that a predetermined fixed amount of free space has occurred (step S6 in FIG. 6).
0), so the next reading from the main processing
It is checked whether a transfer instruction has been issued (step S61).
In the main processing, the second address A '(= A + 1) has already been obtained.
Has been instructed to read / transfer, step S6
1, it is determined as YES, and it is checked whether or not the block information of the address designated this time exists in the DRAM 10 (step S51 in FIG. 5). Since it is YES, the address (A + 1) designated by the current read / transfer instruction is given. to transfer the second secondary buffer memory area 20 ₂ only the specified valid data in the block information of the block BL ₁ (step S56). Then, the free space of the DRAM 10 is monitored to check whether a predetermined fixed amount of free space has been generated, whether the next reading / transfer instruction has been issued by the main processing, and whether the reading end instruction has been issued by the main processing. Steps S60 and S61 in FIG.
S62).

First secondary buffer memory area 20₁The most
When the valid data portion of the first block information is transferred,
The micro computer 24 performs the steps shown in FIG.
In step S15, YES is determined, and the first secondary buffer
Re-area 20₁Analyze the valid data transferred to
Step S16). Then, the song of song number 2 selected by the user
A separate management information table pointer exists and the management information recording area
Of the area in which the song-specific management information table for song number 2 is recorded.
Lock address A_NCheck that the
Step S17). If NO here, A '
Increment and read block information of address A '
First secondary buffer memory area 20 ₁Transfer to side
To the sub-process (steps S18, S19). The
In the sub-process receiving the instruction, the current
Check if the block information of the indicated address exists
(YES in step S61 in FIG. 6, step S61 in FIG. 5)
51) Since it is YES, a finger is
Block BL at specified address (A + 2)_TwoBlock of
The first secondary buffer in which only valid data in the
Fa memory area 20₁(Step S5)
6).

In the main process, step S1 in FIG.
Following 9, the block information waiting to be transferred to the second secondary buffer memory area 20 ₂ (step S20).
If already block information already transferred to the second secondary buffer memory region 20 _2, YES is determined in the step S20, after the 2, f is 1 to e (step S21), and proceeds to step S16, the 2 secondary buffer memory area 2
0 ₂ analyzes the valid data transferred (step S
16). Then, there is a song-specific management information table pointer for the song number 2 selected by the user, and in the management information recording area,
Address A _N blocks music by management information table for the music number 2 is recorded is checked whether found (step S
17). When still NO, increment the A', instructs the transfer to the reading and the second secondary buffer memory region 20 _second side of the block information of a block BL ₃ addresses A'into sub-processing (step S18 , S1
9). In the sub-process receiving the instruction, it is checked whether the block information of the address designated this time exists in the DRAM 10 (YES in step S61 of FIG. 6, step S51 of FIG. 5). Block BL ₃ at the address (A + 3) specified by the transfer instruction
To transfer the second secondary buffer memory area 20 ₂ only the specified valid data in the block information (step S56). Hereinafter, the same processing is repeated.

When the transfer of the block information from the DRAM 10 progresses and a predetermined fixed amount of space is generated, the microcomputer 24 proceeds to step S60 in FIG.
S is determined, and a pause release command is given to the optical disk reading unit 2. Optical disk reading unit 2 receiving the instruction
Releases the pause, reads the block information of each successive block after the address following the last read address, and temporarily stores the block information in the DRAM 10 (step S).
63). As a result, the free space of the DRAM 10 decreases. Microcomputer 2 after step S63
4 checks whether the free space of the DRAM 10 becomes zero and becomes full, checks whether the next read / transfer instruction has been issued by the main processing, and checks whether the read end instruction has been issued by the main processing (step in FIG. 6). S64, S65, S66).

Thereafter, when the microcomputer 24 on the main processing side instructs the sub-processing to read the block information at a certain address A 'and transfer the block information to the e-th secondary buffer memory area _20e (see FIG. 3). In step S19), in the sub-process receiving the instruction, in step S65 of FIG.
It is determined as ES, and it is checked whether the block information of the address designated this time exists in the DRAM 10 (step S67). If YES, the validity in the block information of the address designated by the current read / transfer instruction is determined. Only the data is transferred to the designated e-th secondary buffer memory area 20 _e (step S68). This e-th
The secondary buffer memory area 20 _e result of analyzing the management information transferred to the, when it becomes YES in step S17 in FIG. 3, the microcomputer 24 blocks the song-specific management information table music number 2 is recorded Instruct the sub-process to read the block information at the address A _N and transfer it to the _e-th secondary buffer memory area 20 _e (step S22). Then, it waits until the instructed block information is transferred to the _e-th secondary buffer memory area 20 _e (step S23).

In the sub-process receiving the instruction, the DRAM
It is checked whether the block information of the address designated this time exists in 10 (YES in step S65, S6
7), the process proceeds to step S68 if YES, the the here assumed to be NO, then clears the DRAM 10, gives a search instruction address A _N to the optical disc reading unit 2, a block of consecutive blocks after the address A _N Information is read (steps S52 and S5 in FIG. 5).
3). Upon receiving the search instruction, the optical disk reading unit 2
The address A _N of the CD-R 1A is searched, and after the search, block information of 90 consecutive blocks after the address A _N is read and temporarily stored in the DRAM 10.

When a reading completion notification signal indicating that reading of 90 blocks has been completed is input from the optical disk reading unit 2, the microcomputer 24 determines YES in step S54 and gives a pause command to the optical disk reading unit 2. To a pause state (step S5).
5), only the valid data in the block information of this read-transfer is specified by the instruction address A _N, is transferred to the secondary buffer memory region 20 _e of the e designated (step S56). Then, the microcomputer 24 determines YES in step S23 of the main process, analyzes the contents of the secondary buffer memory region 20 _e of the e, a start address N _S and the end address N _E of the presentation information of the song number 2 Is obtained and stored in the work area of the RAM 22, and the analysis process is completed (step S24).

(2) Reading and Reproduction of Presentation Information After step S24, the microcomputer 24 in the main process of FIG.
_{S (= A + i + 1} . See FIG. 2) a B', first, after setting the second secondary buffer memory region 20 _1, 20 e indicating whether the ₂ and f each 1 and 2, address B the transfer to the reading and the first secondary buffer memory region 20 ₁ on the side of the block information of 'instructs the sub-process (step S
30, S31). Subsequently, increments B', it instructs the transfer to the reading and the second secondary buffer memory region 20 _second side of the block information of the address B'in sub-processing (step S32, S33). Then, it waits for block information to be transferred to the _first secondary buffer memory area 201 (step S34).

In the sub-processing shown in FIGS.
If the read / transfer of the block information at the address B 'is instructed in the main processing before the data is full, step S in FIG.
It is determined YES at 65, and it is checked whether the block information of the address designated this time exists in the DRAM 10 (step S67). If NO here,
After clearing the DRAM 10 (step S5 in FIG. 5)
2), a search command for the address B 'is given to the optical disk reading unit 2, and 90 consecutive blocks BLA _{+ i + 1} , BLA _{+ i + 2} , BLA _{+ i + 3} ,. Block information is read (step S53). Upon receiving the search instruction, the optical disk reading unit 2 reads the CD-R1
A is searched for address B ', and after the search, address B'
After reading the subsequent block information of 90 consecutive blocks and temporarily storing the same in the DRAM 10, a read completion notification signal is output. The microcomputer 24 that has received the notification signal determines YES in step S54,
A pause command is given to the optical disc reading unit 2 to put it into a pause state (step S55), and only valid data in the block information of the block BL _{i + 1} at the address B 'designated by the current reading / transfer instruction is designated. the first is transferred to the secondary buffer memory region 20 ₁ (step S5
6). Then, it waits for the next read / transfer instruction from the main process (step S61 in FIG. 6).

In the main processing, the second address B 'has already been set.
(= N _s + 1 = A + i + 2; see FIG. 2), so that YES is determined in the step S61, and it is checked whether or not the block information of the address designated this time exists in the DRAM 10 ( Step S in FIG.
51) Since YES here, the block B at the address (A + i + 2) designated by the current read / transfer instruction
Only L i _{+ 2} of the valid data in the block information, thereby transferring the second secondary buffer memory area 20 ₂ designated (step S56). Then, it waits for the next read / transfer instruction from the main process (step S6 in FIG. 6).
1).

[0025] valid data of the first secondary first block information buffer memory region 20 ₁ into Kyokuban 2 is transferred, the microcomputer 24 in the main processing,
4 is determined as YES, and the transfer is performed by sequentially reading out the MP3 data, which is valid data, stored in the _first secondary buffer memory area 201 and outputting the same to the MP3 decoder 22 (step S35). The MP3 decoder 22 expands the input MP3 data and outputs digital audio data. The digital audio data is D / A converted and output. First secondary buffer memory region 20 ₁ When empty, the microcomputer 24 (B'-1) of track numbers 2 end address N _E
(= A + j) is checked (step S3)
6, S37), if NO, the increments B', after a 2, f is 1 to e (step S38), reading and first secondary buffer memory area of the block information of the address B'20 ₁ To the sub-process (step S39). In the sub-process receiving the instruction,
It is checked whether or not the block information of the address designated this time exists in the DRAM 10 (YES in step S61 in FIG. 6, step S51 in FIG. 5), and since YES, the address (N _S + 2
= A + i + 3. Is transferred to the first secondary buffer memory region 20 ₁ only the specified valid data block information of a block BL i _{+ 3} in FIG see 2) (step S56).

On the other hand, in the main processing, subsequent to step S39, the block information is checked whether already transferred to the second secondary buffer memory area 20 ₂ (step S34). Here the DRAM10 first, second secondary buffer memory region 20 _1, 20 transfer the valid data for one block of ₂ to one, the first, second secondary buffer memory area 20
_1, 20 is made from a _second one in a short time compared to the output of valid data of one block to the MP3 decoder 22.
Therefore, the microcomputer 24 determines YES in step S34 immediately after the processing in step S39, proceeds to step S35, and proceeds to the second secondary buffer memory area 2
0 ₂ already since the output the transferred valid data (MP3 data) sequentially to the MP3 decoder 22, not the output of the MP3 decoder 22 of the MP3 data is interrupted. Then, M from the second secondary buffer memory region 20 ₂
During the output of the P3 data, valid data of one block in a short time to the first secondary buffer memory region 20 ₁ of the other from the DRAM10 is transferred.

[0027] The second secondary buffer memory region 20 ₂ is empty, the microcomputer 24 (B'-1) is checked whether it matches the end address N _E music number 2 (Step S36, S37), if NO, the increments B', after a 1, f 2 and e (step S38), transfer to the reading and the second secondary buffer memory region 20 _second side of the block information of the address B' To the sub-process (step S39). In the sub-process receiving the instruction, it is checked whether the block information of the address designated this time exists in the DRAM 10 (YES in step S61 in FIG. 6, step S51 in FIG. 5), and YES
So, this reading and transfer specified by the instruction address block BL of the _{(N S + 3 = A +} i + 4. See Figure 2)
The second specified only valid data of block information of _{i + 4}
Is transferred to the secondary buffer memory area 20 ₂ (step S56).

On the other hand, in the main processing, after step S39, it is checked whether the block information has been transferred to the _first secondary buffer memory area 201 (step S34).
Since the determination is YES, the process proceeds to step S35, and the valid data (MP3 data) already transferred to the _first secondary buffer memory area 201 is sequentially output to the MP3 decoder 22, so that the MP3 data is output to the MP3 decoder 22. Is not interrupted. Then, the first from the secondary buffer memory region 20 ₁ while outputting MP3 data, the other of the second secondary buffer memory region 20 ₂ in DR
One block of valid data is transferred from the AM 10 in a short time. Hereinafter, the same processing is repeated.

When the transfer of the block information from the DRAM 10 progresses and a predetermined fixed amount of space is generated, the microcomputer 24 proceeds to step S60 in FIG.
S is determined, and a pause release command is given to the optical disk reading unit 2. Optical disk reading unit 2 receiving the instruction
Releases the pause, reads the block information of each successive block after the address following the last read address, and temporarily stores the block information in the DRAM 10 (step S).
63). As a result, the free space of the DRAM 10 decreases. Microcomputer 2 after step S63
4 checks whether the free space of the DRAM 10 becomes zero and becomes full, checks whether the next read / transfer instruction has been issued by the main processing, and checks whether the read end instruction has been issued by the main processing (step in FIG. 6). S64, S65, S66).

The microcomputer 24 on the main processing side
When instructing the sub-process to read the block information at a certain address B 'and transfer it to the _f-th secondary buffer memory area 20f (step S39 in FIG. 4), in the sub-process receiving the instruction, It is determined as YES in step S65 of FIG. 6, and it is checked whether the block information of the address designated this time exists in the DRAM 10 (step S67).
If YES, the is transferred to the secondary buffer memory region 20 _f of the f specified only valid data in the block information for the specified address in this read-transfer instruction (step S68). The valid data transferred to the _f-th secondary buffer memory area 20f is output to the MP3 decoder 22 by the subsequent main processing (Step S35 in FIG. 4).

Thereafter, when the DRAM 10 becomes full, the microcomputer 24 determines "YES" in step S64 in a sub-process, gives a pause command, and issues a pause command.
1A, the reading from the DRAM 10 is interrupted.
Or second secondary buffer memory region 20 _1, 20 of the MP3 data into ₂ transfer and the first or second secondary buffer memory region 20 _1, 20 ₂ from the MP3 decoder 22
Only the output of the MP3 data is performed. And DRAM1
When a certain amount of free space is generated in 0, a pause release command is given again to restart reading from the CD-R 1A. Thereafter, in the main process, YES in step S37 in FIG.
, The MP3 data for song number 2 is gone,
The transfer to the P3 decoder 22 is completed, the reading is instructed to the sub-process (step S40), and the sub-process receiving the reading end command gives a reading stop command to the optical disc reading unit 2 to perform a reading operation from the CD-R 1A. Is stopped, and the present presentation information reproduction process ends (YES in step S62, S70, or YES in step S66, S71).

According to this embodiment, when reproducing the presentation information, the microcomputer 24 controls the optical disk reading section 2 to read the block information of a large number of continuous blocks constituting the desired presentation information from the CD-R 1A. While temporarily storing the effective data (MP3 data) in the block information of the blocks making up the desired presentation information from the DRAM 10,
3 output from the MP3 decoder 2
2, the decompression operation can be performed correctly. Moreover,
The first two much smaller capacity than the DRAM 10, the second secondary buffer memory region 20 _1, 20 ₂ was prepared,
The DRAM 1 is stored in the secondary buffer memory area on one free side.
0 while transferring valid data (MP3 data) from the other side which has already been transferred from the DRAM 10 in parallel.
Since the valid data (MP3 data) is sequentially output to the three decoders 22, the valid data (MP3 data) can be output to the MP3 decoder 22 without interruption with a small load on the storage unit.

The microcomputer 24 has management information.
When analyzing the information, the optical disk reading unit 2 is controlled and the CD-
A large number of continuous blocks constituting desired management information from R1A
Large capacity DRAM by reading lock block information
10 while temporarily storing the desired
Valid in the block information of the blocks that compose the management information
Only the data is extracted and the two first and second secondary
Buffer memory area 20 ₁, 20_TwoOf unvalidated valid data
Data is transferred to the side with no data and analyzed.
There is no need to prepare separate storage means for
The burden is minimal. Also, the desired CD-R1A
Read management information or presentation information
Optical disk read control to be stored in the DRAM 10, D
First and second secondary buffer memory areas 2 from RAM 10
0₁, 20_TwoTransfer control to the first and second secondary buffers
Memory area 20₁, 20_TwoTo MP3 decoder 22
MP3 data output control and management information analysis
Create a dedicated control IC because it can be performed using a computer
It is not necessary, and the burden on the configuration does not increase.

In the above-described embodiment, a CD-R is taken as an example of an optical disk.
Other types such as (compact disk-rewritable) can be similarly applied. Also, the presentation information in the compression format may be music data in a compression format other than MP3, or compressed moving image data. Although the capacity of the DRAM was set to 90 blocks,
It suffices if there are several dozen blocks or more. The storage capacity m of the first and second buffer memory areas 20 ₁ and 20 ₂ may be one block or two blocks, or m = 3 or 4 or 5 or 6. ,
The point is that it should be 1 to 10 minutes less than the DRAM,
Only the valid data in the block information is transferred from the AM to the first and second buffer memory areas 20 ₁ and 20 by m blocks.
Transfer to one of the _two .

[0035]

According to the present invention, at the time of presentation information reproduction, only effective data is read from block information constituting presentation information of a desired compression format read from an optical disk and stored in a large-capacity primary storage means. Since the data can be taken out and output to the decompression means, the decompression operation can be performed correctly by the decompression means. In addition, two secondary storage units having a much smaller capacity than the large-capacity primary storage unit are prepared, and valid data is transferred from the primary storage unit to one of the secondary storage units and transferred from the other primary storage unit. Since the valid data is output from the secondary storage means to the decompression means, the valid data can be output without interruption while reducing the load on the storage means.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an optical disc reproducing device according to one embodiment of the present invention.

FIG. 2 is an explanatory diagram of recorded contents of a CD-R in FIG.

FIG. 3 is a flowchart showing main processing by the microcomputer in FIG. 1;

FIG. 4 is a flowchart showing main processing by the microcomputer in FIG. 1;

FIG. 5 is a flowchart showing a sub-process by the microcomputer in FIG. 1;

FIG. 6 is a flowchart showing a sub-process by the microcomputer in FIG. 1;

FIG. 7 is an explanatory diagram of a CD-ROM format.

FIG. 8 is a block diagram showing a configuration of a conventional optical disc reproducing apparatus.

[Explanation of symbols]

Reference Signs List 1A CD-R 2 Optical disk reading section 10 DRAM 20 RAM 20 ₁ First secondary buffer memory area 20 ₂ Second secondary buffer memory area 22 MP3 decoder 23 D / A conversion circuit 24 Microcomputer

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H04N 5/928 H04N 5/92 E 5/92 HF term (reference) 5C052 AA02 AA17 CC11 GA04 GB01 GB07 GC05 GD03 GE04 5C053 FA24 FA27 GA11 GB11 GB21 JA05 JA12 KA04 KA25 5D044 AB05 BC05 DE23 DE28 DE33 DE54 DE57 FG10 FG19 GK08 HH05 JJ02 5D045 DA20 9A001 BB03 EE04 HH15 JJ71 KK54

Claims (4)

[Claims] 1. An optical disk on which predetermined presentation information in a compressed format is divided and recorded in units of blocks is read as continuous block information after a desired block, and n (n is an integer of several tens or more) blocks are read. An optical disk reading means for storing in a primary storage means capable of storing the block information of the following; a first secondary storage means and a second secondary storage means each capable of storing m blocks of effective data smaller than n; Decompression means for inputting valid data of predetermined presentation information in a format, decompressing and outputting the data, and primary storage means for controlling an optical disc reading means for reading a plurality of continuous block information including desired presentation information from the optical disc. And the desired presentation information stored in the primary storage means. The valid data in the desired block information including
Read / transfer control means for transferring data to the empty side of the first secondary storage means and the second secondary storage means for each block, the first secondary storage means or the second secondary storage means The validity data of the presentation information stored on one side is transferred to the decompression means, and when the one side becomes empty, the validity data of the presentation information stored on the other side is decompressed by the decompression means. And an output control means for repeating a control of outputting valid data of the presentation information stored in the one side to the decompression means when the other side becomes empty. Playback device. 2. For an optical disc in which predetermined presentation information in a compressed format is divided and recorded in block units, continuous block information after a desired block is read, and n (n is an integer of several tens or more) blocks are read. An optical disk reading means for storing in a primary storage means capable of storing the block information of the following; a first secondary storage means and a second secondary storage means each capable of storing m blocks of effective data smaller than n; Decompression means for inputting valid data of predetermined presentation information in a format, decompressing and outputting the data, and primary storage means for controlling an optical disc reading means for reading a plurality of continuous block information including desired presentation information from the optical disc. And the desired presentation information stored in the primary storage means. The valid data in the desired block information including
A read / transfer control process for transferring data to the empty side of the first secondary storage device and the second secondary storage device for each block, and a first secondary storage device or a second secondary storage device The validity data of the presentation information stored on one side is transferred to the decompression means, and when the one side becomes empty, the validity data of the presentation information stored on the other side is decompressed by the decompression means. And a microcomputer for executing an output control process for repeating the control of causing the decompression means to output valid data of the presentation information stored in the one side when the other side becomes empty. An optical disc reproducing apparatus characterized by the above-mentioned. 3. An optical disk in which predetermined presentation information and predetermined management information in a compressed format are divided and recorded in units of blocks is read, and continuous block information after a desired block is read, and n (n is several tens) An optical disk reading means for storing in the primary storage means capable of storing block information of the above (integer) blocks; a first secondary storage means and a second secondary storage means each capable of storing m blocks of valid data smaller than n; A second storage unit, a decompression unit that inputs valid data of predetermined presentation information in a compressed format, decompresses and outputs the data, and controls an optical disk reading unit.
While reading a plurality of continuous block information including the desired management information from the optical disk and storing it in the primary storage unit, the effective data in the block information including the desired management information stored in the primary storage unit is defined as m The data is transferred to the side of the first secondary storage means and the second secondary storage means, on which no unanalyzed valid data exists, by blocks, and at the time of presentation information reproduction, continuous data including desired presentation information from the optical disk is continuously transmitted. While a plurality of block information is read and stored in the primary storage means, the effective data of the desired block information including the desired presentation information stored in the primary storage means is stored in the first secondary storage for each m blocks. Read / transfer control means for transferring data to the free side of the means and the second secondary storage means; Analyzing means for analyzing the unanalyzed valid data stored in the secondary storage means or the second secondary storage means to obtain a recording position of desired presentation information; and providing the first secondary storage means or In the second secondary storage means, the effective data of the presentation information stored on one side previously transferred is output to the decompression means, and when the one side becomes empty, the presentation data stored on the other side is output. Output control means for causing the decompression means to output valid data of the information and, when the other side becomes empty, repeating the control of outputting the valid data of the presentation information stored in the one side to the decompression means. An optical disc reproducing apparatus, characterized in that: 4. For an optical disc on which predetermined presentation information and predetermined management information in a compressed format are separately recorded in block units, continuous block information after a desired block is read, and n (n is several tens) An optical disk reading means for storing in the primary storage means capable of storing block information of the above (integer) blocks; a first secondary storage means and a second secondary storage means each capable of storing m blocks of valid data smaller than n; A second storage unit, a decompression unit that inputs valid data of predetermined presentation information in a compressed format, decompresses and outputs the data, and controls an optical disk reading unit.
While reading a plurality of continuous block information including the desired management information from the optical disk and storing it in the primary storage unit, the effective data in the block information including the desired management information stored in the primary storage unit is defined as m The data is transferred to the side of the first secondary storage means and the second secondary storage means, on which no unanalyzed valid data exists, by blocks, and at the time of presentation information reproduction, continuous data including desired presentation information from the optical disk is continuously transmitted. While the plurality of block information is read and stored in the primary storage means, the effective data of the desired block information including the desired presentation information stored in the primary storage means is stored in the first secondary storage for each m blocks. Read / transfer control processing for transferring data to an empty state side of the means and the second secondary storage means; Analysis processing for analyzing the unanalyzed valid data stored in the secondary storage means or the second secondary storage means to determine the recording position of the desired presentation information, and the first secondary storage means when reproducing the presentation information Alternatively, in the second secondary storage means, the valid data of the presentation information previously transferred and stored on one side is outputted to the decompression means, and when the one side becomes empty, the data is stored on the other side. When the effective data of the presentation information is output to the decompression means, and the other side becomes empty,
An optical disc reproducing apparatus comprising: a microcomputer that executes an output control process that repeats a control of causing the decompressor to output valid data of presentation information stored on the one side.