JP3239033B2 - Optical disk and optical disk reading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk capable of reproducing recorded information (images, sounds, computer data, etc.) in real time and at high speed, and a reading apparatus therefor.

[0002]

2. Description of the Related Art In an optical disk, a basic reading speed is usually prepared for the medium. This generally accompanies the execution of an application that requires real-time properties. For example, for a music CD, about 17
Data is transferred at 6.4 [kbyte / sec]. This value is
This is a value obtained from the recording format of the music CD (= sampling frequency 44.1 [kHz], quantization bit number 16 [bit], stereo left and right 2 channels).
A music CD can record music data equivalent to 74 minutes. These are standardized as “ISO / IEC, 908”. The above-described speed is also the basis for a CD-ROM that uses this CD as a medium for computer data. This CD-ROM standard has a physical format of “ISO / IEC, 10149” and a logical format of “ISO / IEC, 9660”.
Are standardized respectively. MPEG1 "ISO / IEC, 1117" which is a compression / decompression standard for digital moving images
2) is based on the above transfer rate, and a standard for compressing / decompressing data of a full-color digital moving image and two channels of audio is configured.

In recent years, speeding up of CD and CD-ROM drives has been realized, and high-speed data reading has become possible. That is, the normal speed (1.
4 [Mbit / sec], the relative linear velocity between the disk and the pickup is 1.2 to 1.4 [m / sec]) n times faster (n> 1, allowing decimals, currently about "n = 4") ), The data can be read by rotating the disk.
This corresponds to the need to read data at high speed. For example, some high-end audio enthusiasts are dissatisfied with the current situation of a sampling frequency of 44.1 [kHz] and a quantization of 16 [bit], and higher sampling frequencies and quantization bit numbers are expected.
In the field of digital video compression / expansion technology, HD
MPEG for high-definition television such as TV and ATV
2 "ISO / IEC, 13818" has been standardized, but in MPEG2, a transfer rate higher than that of MPEG1 is required as a transfer rate of image data, and an upper limit is not defined. For this reason, MP
In EG2, there are several types of MPEG2 data having different bit rates. Therefore, in a drive device for reproducing an optical disk on which MPEG2 data is recorded,
It is necessary to be able to cope with different reading speeds for different disks and different reading speeds within the same disk. For these reasons, drive devices capable of high-speed reading as described above have been provided.

[0004] Further, with the improvement of the recording density due to the improvement of the recording accuracy, the improvement of the converging accuracy of the laser light for pickup, or the development of a short wavelength laser, an optical disk with a high recording density is being realized. For this reason, high-quality image data and high-sound-quality audio data having a large amount of information can be recorded and reproduced for a long time.

In data recorded on an optical disk, FIG.
Is introduced. (A) in the figure shows a block structure called mode 1.
(B) shows a block structure called mode 2. The concept described above was introduced into a CD-ROM based on a music CD, and the "ISO"
/ IEC, 10149 ", one block is 2352 [byt
e]. The available user data area is 2048 [bytes] in mode 1 and 2324 [bytes] in mode 2. Further, since an error correction code is added in mode 1, the error rate is about 1/100 of mode 2
It is about 0. In the above block structure, the header is
12 bytes of SYNC data, 3 bytes from the top
Block address data (= 1 [byte] each,
Second, each block data) consists of 1 [byte] mode data. Block address data composed of minutes, seconds, and blocks are recorded in BCD (Binary Coded Decimal). These can be expressed in terms of “0 to 99” in terms of notation, but “0 to 59” can appear in seconds, and “0 to 74” can appear in a block by definition. In addition, although minutes can appear as “0 to 73”, in actuality, by lowering the linear velocity or narrowing the pitch interval and recording,
Music CDs of more than 74 minutes are also provided, and in such a case, the score is "74" or more.

[0006]

The basic speed (17)
If the data is transferred and decoded at 6.4 [kbyte / sec]), the output time of the address data and the moving image or music becomes equal. However, when the optical disk is rotated at n times speed for high-speed reproduction as described above, the output time of the moving image or the music has a different value from the address data. For example, if the time notation based on the address data is performed in the case of reproducing at double speed (n = 2), there is a problem that a time twice as long as the actual output time is written. The same problem occurs when data encoded at a variable bit rate is reproduced as in the above-described MPEG2 or the like. The reason why the variable bit rate is adopted in MPEG2 is to prevent the image quality of a screen having a large amount of information from deteriorating.

[0007]

[0008]

[0009]

According to the present invention, data to be read at a reading speed of n (n> 1) times the standard reading speed is provided for every n times the data amount of the standard block structure. This is an optical disc recorded with a block address to be updated. When n is an integer, data to be read at n times the read speed may be configured in a standard block structure, and a block address updated in units of n consecutive blocks may be assigned to each block. If n has a decimal part, data to be read at n times the read speed is divided into n times the data amount of the standard block structure, and each data is divided into data of the standard block structure. After adding (N−n) times the amount of data, a standard block structure is configured, and a block address updated in units of N consecutive blocks may be assigned to each block. Here, N is (n + 1)> N
> N. The (N−n) times the amount of data may be padding data or data to be read at a standard (N−n) times reading speed (such as subtitle data of a Western movie). Further, the data to be read at the above-mentioned n-times read speed may be configured in a block structure having a data amount of n times the data amount of the standard block structure, and a block address to be sequentially updated may be assigned to each block. .

According to another aspect of the present invention, there is provided an apparatus for reading recorded information of an optical disk and a block address associated with the information, comprising: an extracting unit for extracting read speed information indicating a read speed of the optical disk from the optical disk; Correction means for correcting the block address based on the speed information;
An optical disk reading device having The extraction means,
The read speed information of the optical disc and the position information indicating the area to be read at the read speed are extracted and stored in association with each other, and the correction means reads the position information when reading the area indicated by the position information. May be configured to correct the block address based on the read speed information associated with.

[0011]

The reading speed information is extracted from the optical disk of the present invention having the reading speed information recorded thereon by the reading device of the present invention having the extracting means and the correcting means, and the block address is corrected based on the reading speed information. Is done. The elapsed time after this correction matches the actual elapsed time. An optical disc of the present invention in which data to be read at a standard read speed of n times is attached with a block address that is updated every n times the data amount of the standard block, and the data is read at a standard read speed of n times By being read, the elapsed time indicated by the block address matches the actual elapsed time.

[0012]

Embodiments of the present invention will be described below.

FIG. 1 shows an optical disk (CD-RO) according to a first embodiment.
M shows the physical format of one block of the M mode 1 disk), and the second and subsequent rows show the block addresses assigned to each block. The first embodiment is a CD-ROM disc recorded at 2 to 4 times speed,
Reading is also performed at double speed to quadruple speed, respectively. Where 2
Double speed to quadruple speed means that the basic speed is 176.4 [kbyte]
/ sec]). It is assumed that the reading of the disk and the decoding of the data are performed at the same rate. The data amount of each block, 2352 [bytes], is a data amount corresponding to 1/75 [sec] in terms of the music CD performance time.

As shown in the second stage of FIG.
-In a ROM disk, a block address is assigned in units of two consecutive blocks. Similarly, a block address is assigned in units of three consecutive blocks in a triple speed CD-ROM disk, and a block address is assigned in units of four consecutive blocks in a quadruple speed CD-ROM disk. Here, “a block address is assigned in units of a plurality of continuous blocks” means “a block address in which the block address of an arbitrary block in the immediately preceding unit is updated for each block in the same unit (= the same block) ) Is assigned to the first block in the same unit, or a block address obtained by updating the block address of the first block in the immediately preceding unit is assigned to the first block in the same unit, and valid blocks are assigned to the second and subsequent blocks in the same unit. Data that can be identified as not an address is assigned. "
Means that.

As described above, if the update of the block address of each of the second and subsequent blocks in the same unit is prohibited,
The elapsed time of the reproduced signal read and output from the CD-ROM disk is equal to the elapsed time indicated by the block address. For example, when a double-speed CD-ROM disc to which addresses are assigned in units of two blocks is reproduced at double speed, the block address is updated for each unit (= 2 blocks). Therefore, the elapsed time of the output signal becomes equal to the description time of the block address. The same applies to a triple-speed or quadruple-speed CD-ROM disk, and also to an N-times (N is an integer) double-speed CD-ROM disk, and the time notation based on the block address can be made to match the actual elapsed time. This is because the change amount of the block address read within a certain predetermined time becomes constant as a result of the block address being allocated as described above.

In the first embodiment, the mode 1 disc of the CD-ROM has been described.
The same can be applied to the address information described in the Q channel of the sub-code of (D-DA). Various optical disks (CD-MO, LD, LD-ROM, CD-WO, CD-ROM) having a block structure in consideration of real-time performance
-R etc.) can be similarly applied. In addition, as a triple speed optical disk (CD-DA), for example, 8 ×
There is a music CD recorded with high sound quality by sub-sampling at 8.1 [kHz] and quantizing at 24 [bit]. In addition, as an optical disk having a variable bit rate to be read at a variable playback speed, there is a disk on which moving image information encoded according to MPEG2 is recorded.

Second Embodiment In the second embodiment, the elapsed time indicated by the block address and the actual elapsed time reproduced and output can be matched with respect to data corresponding to n (n ≠ integer) times speed. An optical disk is provided.

FIG. 3 (a) shows a data string corresponding to 3.5 times speed, and FIGS. 3 (b) to 3 (d) show data (==) for each successive 3.5 blocks in the data string of (a). 3.5 × 235
2 [byte] data) is converted into data of four consecutive blocks (= 4 × 2352 [byte] data),
A state in which the four blocks are recorded on the optical disc in a unit is shown. The basic speed, block structure, disc type, and the like may be the same as in the first embodiment.

First, a data sequence corresponding to 3.5 times speed shown in (a) is divided every 3.5 blocks of data amount (3.5 × 2352 [bytes]) as shown in (b). next,
As shown in (c), padding data of 0.5 block (0.5 × 2352 [bytes]) is added to the end of each divided data. The padding data is, for example, “all 0s”.
Data. Next, as shown in (d), the data to which padding data has been added is recorded on the disk as data in units of four blocks. That is, as in the case of the quadruple speed of the first embodiment, a block address updated every four blocks is given and recorded. The disk on which the data is recorded is read at a quadruple speed. At this time, the padding data of 0.5 block of each unit is discarded in the reproducing device or the application, and the quadruple speed data is transferred. The data sequence corresponding to the 3.5 × speed is, for example, a code of a full-color moving image including audio data according to MPEG2 and having a transfer rate of 3.5.
Appears when doubled.

Although the above description has been made with respect to a data sequence equivalent to 3.5 times speed, similar processing can be performed for a data sequence equivalent to n (n ≠ integer) times speed. That is, the data sequence corresponding to the n-times speed is divided for each data amount of n blocks, and padding data for (N-n) blocks is added to the end of each divided data. Here, N is an integer satisfying “n + 1>N> n”, and is obtained by rounding up n. Next, the data to which the padding data has been added is recorded on the disc as data in units of N blocks.
In other words, the data whose block address is updated every N blocks is recorded on the disk as data equivalent to N times speed. By reading the disc recorded in this manner at N times speed and discarding the padding data at the time of the reading, it is possible to match the elapsed time indicated by the block address with the actual elapsed time reproduced and output.

In the above description, data of "all 0s" is used as padding data, but this may be data of "all 1s". Alternatively, data that cannot appear when decoding a CD-ROM may be recorded, and when this is detected by a decoder, it may be skipped as padding data. Alternatively, a padding code may be determined from among the codes of the CD-ROM, and when the code is detected, data in the subsequent blocks may be treated as padding data. Although padding data is added to the end in the above description, a recording method in which the padding data is distributed to predetermined positions of each block is also possible.

Third Embodiment In the third embodiment, meaningful data is multiplexed in place of the padding data of the second embodiment. The meaningful data is, for example, data such as subtitles for a foreign movie. In addition, the selection of meaningful data is left to the user. Other points are the same as in the second embodiment. For this reason, the different points from the second embodiment will be mainly described, and the description of the same points will be omitted.

FIG. 4A shows a data string equivalent to 3.5 times speed, and FIG. 4A shows a data string equivalent to 0.5 times speed (example: caption data). (B) to (c) and (B) are:
(A) Data (3.5 × 2352 [byte] data) for each continuous 3.5 blocks in the data string;
From the data for each 0.5 block (= 0.5 × 2352 [byte] data) in the data string of (A), the data for each successive 4 blocks (= 4 × 2352 [byt)
e) is generated and is recorded on the optical disc in units of four blocks. That is, a state in which the block address is updated every four blocks and the data is recorded on the optical disc as data corresponding to the quadruple speed is shown.
Note that the basic speed, block structure, disc type, and the like may be the same as in the first and second embodiments.

The data based on the data sequence corresponding to the 0.5-times speed in FIG. 4A is normally discarded in the same manner as the padding data of the second embodiment, but if the data is selected by the user, Data read at 4 × speed (3.
The data corresponding to 5 × speed + the data corresponding to 0.5 × speed) are demultiplexed, input to different decoders, and decoded. Data corresponding to 3.5 × speed and data corresponding to 0.5 × speed can be identified by providing a marker, for example.
Note that even when reading only data corresponding to 0.5 × speed, it is necessary to read at 4 × speed.

In the above description, a 3.5-times data string (a)
And a case in which a quadruple-speed data train (c) is obtained from a 0.5-times-speed data train (A), but is applicable to a case in which an M-times data train is obtained from n-times and k-times data trains. . Here, n and k are positive values allowing a decimal part,
“M = n + k”.

Fourth Embodiment Next, a configuration in which the amount of data in a block is variable will be described. In the fourth embodiment, the capacity of the data area in the block is recorded on the disk so as to be proportional to the data reading speed, whereby the first to third embodiments (the number of blocks in the unit block) are performed. Is achieved in proportion to the data reading speed). Note that the types of disks to be used in this embodiment are the same as those in the above embodiments. Hereinafter, the different points will be mainly described.

FIG. 5A shows a block configuration based on the basic speed data sequence, and FIG. 5B shows a block configuration based on the double speed data sequence. That is, in the case of a data sequence corresponding to the basic speed as shown in the upper part of (a), one block has a standard data amount (eg, the configuration shown in FIG. 2).
Each block is configured (see the lower part of (a)). on the other hand,
(B) In the case of a data string equivalent to double speed as in the upper row,
Each block is configured such that the data amount of one block is twice the standard (see the lower part of (b)). The block address is set so as to be updated for each block in both cases (a) and (b).

Since a disk having the above-described structure and corresponding to a double speed is read at a double speed, the reading apparatus uses:
The time change described by the block address is equal to the actual time change of the output signal. The same applies to a disc corresponding to n (n is a positive number that allows a decimal part) double speed.

Fifth Embodiment In a fifth embodiment, as shown in FIG. 6, a disk has a different reading speed depending on the area. In addition, the fifth embodiment
This is a reading device for reproducing the information recorded on such a disc. The read speed suitable for each area is, for example, recorded in the lead-in area at the innermost circumference of the disc as table information, or multiplexed in data. In addition, it may be recorded at the beginning of each area.

In the fifth embodiment, the block address is corrected based on the read speed information so that the time notation of the block address matches the actual time lapse of the reproduced output signal. For example, when the area currently being read is a double speed area, the value of the block address to be read is corrected to 1/2.

Note that both areas (standard speed area, 2
In the double-speed area, the description of the block structure and the block address is the same as that of the conventional disk, and the configuration (the configuration in which the number of blocks in a unit block is proportional to the read speed, the data in the block) This is not a configuration in which the capacity of the area is proportional to the reading speed). Further, the type of the disk which is the object of the fifth embodiment, the point which can be similarly applied to the address multiplexed in the data, and the like are the same as in the above embodiments. Hereinafter, the different points will be mainly described.

If the read speed information of each area and the position information of each area are recorded as table information in the lead-in area, the reading device reads the table information at the start of reproduction, and reads each area based on this. Each block can be read at an appropriate speed, and the read block address can be corrected based on the read speed information of the area.

When the reading speed information of each area is multiplexed with the data, the above-mentioned position information is unnecessary, and the reading device can read an arbitrary area at a reading speed suitable for the area, and can read out any area. Block address to be corrected based on the read speed information of the area.

Even when the read speed information of each area is recorded at the head of each area, the above position information is unnecessary.
When the reading speed information is recorded at the head of each area, it is preferable to record the reading speed information also in a portion (the beginning of a program or the beginning of a song) that is likely to be read from the middle of each area. .

The read speed information includes, for example, a magnification relative to the basic read speed, the read speed itself, or M
There are a compression rate and a bit rate for PEG and the like. Further, the value of the bit rate or the like does not necessarily need to be accurate, and may be relaxed by the buffer memory while monitoring the capacity of the buffer memory.

In the above description, as shown in FIG. 6, a disc in which data at different reading speeds are recorded in two areas on the inner peripheral side and the outer peripheral side is described. The same applies to the disk on which the data of the reading speed is recorded.

Next, the reading device will be described with reference to FIG. The recording data of the optical disk of the fifth embodiment is read by the reading means. The reading means is a known device including a pickup, a demodulator, a CD-ROM decoder, a disk motor controller, and the like.

The case of an optical disk in which read speed information and position information are recorded in the innermost lead-in area of the disk will be described. At the start of reproduction, first, a lead-in area is read, and the read speed information and the position information are extracted from the data by speed information extracting means. The extracted information is stored in the storage unit.

Next, the data area (standard speed area or
The reading of the (double speed area) is started, and the block address of each block in the read data is sequentially extracted and sent to the arithmetic means. The read speed information of the read area stored in the storage unit is also sent to the arithmetic unit. Whether or not the read speed information of the read area is determined by referring to the position information.

In the calculating means, the block address is corrected based on the read speed information. For example, if the read speed information is information indicating a double speed read speed, the block address is corrected to １ ／. The output of this calculating means is sent to the reading time output means. The read time output means converts the block address (block address corrected as necessary) sent from the arithmetic means into, for example, a signal for display and outputs the signal. As a result, the elapsed time is indicated on the display means (not shown). The indicated elapsed time matches the actual elapsed time. Note that the same correction as described above can be performed on time information of each song or program recorded in a lead-in area such as a CD.

[0041]

As described above, when the optical disk of the present invention on which the reading speed information is recorded is read by the reading device of the present invention having the extracting means and the correcting means, the reading speed is determined by the extracting means. The information is extracted and the block address is corrected by the correction means based on the read speed information. As a result, the elapsed time after the correction matches the actual elapsed time, thereby achieving the object of the present invention. it can. Also, an optical disk of the present invention in which data to be read at a standard read speed of n times is added with a block address that is updated every n times the standard block data amount, is read by n times the standard read speed. When the data is read at the speed, the elapsed time indicated by the block address matches the actual elapsed time, so that the object of the present invention can be achieved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing block addresses of an optical disc according to a first embodiment.

FIG. 2 is an explanatory diagram showing a block structure of a mode 1 and a mode 2 of the CD-ROM.

FIG. 3 is an explanatory diagram showing a data sequence of an optical disc according to a second embodiment.

FIG. 4 is an explanatory diagram showing a data sequence of an optical disc according to a third embodiment.

FIG. 5 is an explanatory diagram showing a data sequence of an optical disc according to a fourth embodiment.

FIG. 6 is an explanatory diagram showing an area of an optical disc according to a fifth embodiment.

FIG. 7 is a block diagram showing a configuration of a main part of the optical disc reproducing apparatus of the embodiment.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Noritoshi Oki 2-5-5-Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) References JP-A-3-238665 (JP, A) (58) ) Surveyed field (Int.Cl. ⁷ , DB name) G11B 20/10 G11B 19/00-19/16 G11B 27/10-27/34

Claims (6)

(57) [Claims] 1. A read operation of n (n> 1) times the standard read speed
Optical disc on which data to be read at speed is recorded
A is, data odor to be read by the n-fold reading speed
Every n times the data amount of the standard block structure
A block address to be updated
Optical disk. 2. The method according to claim 1, wherein said n is an integer, and said reading speed is n times as large.
The data to be read at a time is stored in a standard block structure.
Blocks are composed of n consecutive blocks as a unit.
2. The client address is updated.
Optical disk. 3. The method according to claim 1, wherein said n has a decimal part, and said n times reading is performed.
The data to be read at speed is a standard block structure
Of the standard block structure for every n times the amount of data
After adding (N-n) times the amount of data,
N consecutive blocks constructed in a quasi-block structure
The feature is that the block address is updated in units of
The optical disk according to claim 1, wherein However, N is (n +
1) An integer satisfying>N> n. 4. The data of (N−n) times the amount of data
4. The optical data according to claim 3, wherein the data is streaming data.
Disk. 5. Recording information on an optical disk and a record
Reading device for reading out the assigned block address
The read speed information indicating the read speed of the optical disk is
Extracting means for extracting the block address from the disk based on the read speed information.
Optical disc reader having a positive correcting means. 6. The optical disk according to claim 1, wherein said extracting means includes information on a reading speed of the optical disk.
Information and position information indicating the area to be read at the read speed.
The correction means when reading the area indicated by the position information.
Based on the reading speed information associated with the position information,
And correcting the block address.
Optical disk reading device.