JP2720823B2 - Optical disc, optical disc reproducing device, and information reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulsed audio signal.
Is converted to a coded modulation signal, and this pulse coded modulation signal is
Optical digital audio recorded on a disc at a constant linear velocity
Audio disk (hereinafter referred to as DAD) or magnetic
Digital pulse recording a pulse-coded modulation signal
Using audio tape (hereinafter referred to as DAT)
Record some data in place of the
Or data when using DAT as a data file.
The present invention relates to a method of recording and reproducing data. [0002] 2. Description of the Related Art In recent years, the capacity of data files has been increasing.
In addition, various recording media have been devised,
Recording media are becoming smaller. Conventionally, an optical disk has been used as a data file.
There have been examples of using
This is a disk that rotates at
It is possible to put address information in a certain location
Was. However, using a DAD recorded and reproduced at a constant linear velocity,
The data capacity contained in one address
If the signal is fixed, the signal is recorded spirally at a constant linear velocity.
Address information in a fixed position on the disc.
Unable to record, address information distributed on disk
Resulting in. DAD is for audio data only.
Therefore, there is no example of using DAD as a data file.
Similarly, an example using DAT as a data file
Absent. [0005] SUMMARY OF THE INVENTION The object of the present invention is to
Data with the address information.
Information recording medium that enables data search using address information
To provide a body and an information reproducing device for reproducing the body.
You. [0006] [Means for Solving the Problems]To solve the above problems
In the invention according to the first aspect, the data is a constant linear velocity.
Optical discs are recorded as multiple blocks in a spiral at different degrees.
Block, the block is a main
It has a channel and a sub-channel, and the main channel
Indicates the position of the block on the optical disk.
For data with address information added,
The storage area of the data string created by performing the sorting operation
A storage area for error detection and correction codes for
The sub-channel has an address of the block.
It is important to provide information and a storage area for the error detection code.
It is an optical disk. The invention according to claim 2
Data is reproduced from the optical disk according to claim 1.
An optical disk reproducing apparatus that performs
Sub-channel data is separated from the read data string.
Separating sub-channel extracting means;
The address is determined by an error detection code in the channel data.
Error detection of the address information and outputting the address information
Error detection means and the sub-channel extraction means
Reordering and error detection on separated data
Error detection and correction means for performing data correction and outputting data.
The sub-channel output of the error detection means.
Using the address information of the desired data in the recording medium
Of the error detection and correction means.
The desired data using the address information in the data
Search for the exact position in the recording medium of the
An optical disc reproducing apparatus characterized by reproducing
You. In the invention according to claim 3, the predetermined length is
Address indicating the position of the data in the recording medium for each data
Reordering of data with added information on the time axis
Created by performing operations and adding the error detection and correction code
The main channel where the data string is recorded, and the address
Error detection code added todataHas,
The main channel is completely independent and time-divisionally recorded.
Data from an information recording medium with recorded sub-channels
In an information reproducing apparatus that reproduces data from an information recording medium,
Subchannel from read data stringData ofA minute
Separating sub-channel extracting means;
ChannelData ofError added to address information in
Before performing error detection of the address information using a detection code
Error detecting means for outputting address information;
Sub-channel with channel extraction meansData is separated
DataPerforms rearrangement and error detection and correction on the data
Error detection and correction means for outputting
Using the address information of the sub-channel, which is the output of the stage,
And desiredData columnApproximate location in the recording medium
In the data output from the error detection and correction means.
Using the address information of the desiredData columnIn the recording medium
Find the exact location of the information and play any data
It is a raw device. [0008] [Function] In the main channel, the data recording medium
Accurate address information that can indicate the exact location of the
ToArea to storeAnd the recording of data on the subchannel
A coarse-grained address that gives an approximate location in the medium
informationArea to store, Prompt inspection
An arbitrary information can be obtained by performing a search operation. [0009] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
I will explain while. FIG. 1 is a diagram showing data recording / reproduction of a DAD.
Temporal positional relationship between main channel and sub channel
FIG. 4 is a data structure diagram showing the data structure. In FIG. 1, S₀, S₁…
…, Are recorded in time division with respect to the main channel
Subchannel byte data, M₀, M₁, …… is Mei
Channel byte data, Q₀, Q₁……, P₀, P₁
…… is the code data for error detection and correction for the main channel.
It is. FIG. 2 is a diagram showing a reproduction signal during DAD reproduction.
It is the block diagram which showed the situation of the flow. In FIG.
1 is the data sequence shown in FIG.
Sub-channel extraction circuit for channel separation, 3 for main
Error detection and correction for channel data and main channel
Code data, 4 is sub-channel data, 5 is
Channel error detection and correction circuit, 6 is a sub-channel
Error detection circuit for address information, 7 is the main channel
Data 8 is subchannel time information. FIG. 3 shows address information to be put in a subchannel.
When the time information of the DAD sub-channel is used for the report
In one embodiment of the present invention, data
It is a figure showing a format. In FIG. 3, T₀,
T₁, …… is the time obtained from the DAD sub-channel
Information, A is 8 bytes provided in the main channel data.
Site synchronization pattern, B₀, B₁, …… is the main channel
8-byte address information provided in the₀, C₁,
…… is 2336 (98) provided in the main channel.
(* 3 * 8-16) bytes of user area. In FIG. 1, each data is represented by S₀, M₀, M₁,
............ M₁₁, Q₀, …… Q_Three, M₁₂, ……, M_{twenty three}, P₀,
……, P_Three, S₁, M_{twenty four}, …… are recorded on the disc in this order.
In this order, the sub-channel extraction
Input to the road 2. The data is stored as shown in FIG.
Channel data 1 byte, main channel data
24 bytes, 8 bytes error correction code for main channel
A frame is composed of a total of 33 bytes.
File is 98 bytes (98 frames) and one block
Make up. First 2 bytes of 98 byte data
Is used as a block synchronization pattern, and the remaining 96 bytes
96 bits, one bit for each byte in the byte, 1
Time information. Also this 96 bit
It contains a 16-bit error detection code. Now, input to the sub-channel extraction circuit 2
Data string 1 extracted only its sub-channel data.
And outputs the sub-channel data 4 to the error detection circuit 6.
Is forced. The error detection circuit 6 extracts the bits of the time information.
Error detection using the erroneous detection code,
If there is no time information, the sub-channel time information 8 is output.
Power. On the other hand, another sub-channel extraction circuit 2
Main channel data and main channel data
The code data 3 for channel error detection and correction is
After being input to the positive circuit 5 and subjected to the error detection and correction operation,
Only the in-channel data 7 is output. This error detection
In the output correction circuit 5, various time axis operations are performed on the data.
Therefore, the main channel data 7 is a data string
Data input order M of main channel during 1₀, M₁, M
_Two... are output in a completely different order. The output data 7 is divided into 8 bytes.
A, B in Fig. 3 _n, C_n(N = 0,
1, 2,...). Main channel data 7 to 23
This length is divided into 52 (98 × 3 × 8) bytes.
Is the main channel equivalent to one block length of the subchannel.
Channel data length, and the time information (a
This is the minimum unit that can be divided using the dress information. Also
Time information T shown in FIG.₀, T₁, T_Two, All lengths
Equally one block long, of course main channel data
Equal to the time corresponding to 2352 bytes. This 2352
Each byte is a record, and the first 8 bytes of the record
Synchronization pattern A is provided, followed by an 8-byte address.
Information B_n(N = 0, 1, 2,...) And the remaining 2
User who can write 336 bytes of information
Rear C_n(N = 0, 1, 2,...). As described above, the sub-channel and the menu
Each in-channel has its own error detection circuit or error
Only the main channel enters the detection and correction circuit
Because the work is rearranged, it is generally shown in FIG.
As described above, Δtn (n = 0, 1, 2,...)
...) On the time axis. This shift is one sheet
It is constant on the disc, but the deviation is quantitative
Address information in the main channel.
It becomes necessary to have. Also sub-channel ads
Information has error detection capability but no error correction capability
Therefore, if a data error occurs, there is no address information.
It will get worse. Therefore, for the above reasons,
Address information B in the channel_n(N = 0,1 ...)
It is essential to enter. The main channel configured as described above
Address information and sub-channel address information
And any record C_nTo search for
Good. First C_nInformation T indicating the address of_n, B_nHorse
That is, the information T included in the sub-channel_nUsing
Perform a kana search. That is, Δt_nT_nMore than
Keep the DAD player in playback from a short time ago
After detecting synchronization pattern A in the
Address information B_m(M = 0,1,2) is B_nIs equal to
Is determined, and the corresponding record C_nGet. Generally D
The AD player rarely uses the time information of the sub-channel.
Since the desired song and time can be specified,
Main channel address judgment circuit for AD player
Can be easily added to the data file by adding
Can be used. In the above example, one record is 2352 bytes.
The smallest addressable unit of the sub-channel
But the number of bytes smaller than this is
Pattern and address for each record
Add more information to divide the main channel
I can do it. Conversely, data input to one record
Increase the number of data to configure a record with a larger number of bytes.
It is also possible. In the above example, the sync pattern
8 bytes, but can be recognized as a synchronization pattern
Any length can be used.
As long as the address information can be identified.
No. After the address information, the data indicating the length of the record is displayed.
It is also possible to change the length of one record
You. DAD uses an error detection and correction code for audio recording and reproduction.
Used to obtain a high degree of data reliability.
Error detection and correction code may be used in the user area.
No. The above is one example in which the present invention is applied to DAD.
Although the embodiment has been described, the main channel
In a DAT with a relatively recordable sub-channel,
The main channel has address information in addition to data.
Record the data string containing
By recording address information, DAT can be
Obviously it can be used as an il. [0021] As is apparent from the above description, the present invention
Information recording medium and information reproducing apparatus
When recording on your body, besides the main channel,
Time-divisionally recorded independently of the channel
Has sub-channels, defaults to the main channel above
Address indicating the position of the data in the recording medium for each long data
Time for a data string to which at least address information is added.
Rearrangement operation on the axis and addition of error detection and correction code
And record the data string created by the
At least for the above address information
Since an error detection code is added and recorded by using
If AD or DAT can be used as a data file
Such an excellent effect can be obtained. Further, in the address information of the main channel,
Can indicate the exact location of the data in the recording medium
Sub-channel addressing using highly accurate address information
Information about the location of the data on the recording medium.
By using coarse-grained address information,
Search operation can be performed promptly, and arbitrary information can be obtained.
The effect that can be obtained is obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a data structure diagram showing a temporal positional relationship between a main channel and a sub-channel at the time of DAD data recording / reproduction. FIG. 2 is a view showing a flow of a reproduction signal at the time of DAD reproduction. The block diagram shown in FIG.
1 shows a data format at the time of data recording / reproduction in one embodiment of the present invention when the time information of the sub-channel is used. [Description of References] 1 Data column 2 Sub-channel extraction circuit 3 Main channel data 4 Sub-channel data 5 Error detection and correction circuit for main channel 6 Error detection and correction circuit for address information 7 Main channel data 8 Sub channel time information

   ────────────────────────────────────────────────── ─── Continuation of front page    (56) References JP-A-58-114363 (JP, A)                 JP-A-57-69518 (JP, A)                 JP-A-58-107738 (JP, A)                 JP-A-55-163929 (JP, A)

Claims (1)

(57) [Claims] Data is spirally divided into multiple blocks at a constant linear velocity.
In an optical disc on which recording is performed, the block includes a main channel arranged in a time-division manner.
An optical disc having the sub-channel, wherein the main channel includes the optical disc of the block;
For data with address information indicating the position above
Of the data column created by performing the sorting operation on the time axis
A storage area and an error detection and correction code for the data string.
A storage area, and the sub-channel has address information of the block.
And a storage area for the error detection code.
Optical disk. 2. A light for reproducing data from the optical disk according to claim 1.
In a disc reproducing apparatus, a sub-channel is read from a data sequence read from the optical disc.
Sub-channel extracting means for separating channel data; and an error detection code in the separated sub-channel data.
Error detection of the address information by the
Error detection means for outputting address information, and the sub-channel is separated by the sub-channel extraction means.
Rearranges and performs error detection and correction on the
Error detection and correction means for outputting an error of the sub-channel which is an output of the error detection means.
Using the dress information, the desired data in the recording medium
The approximate position is searched, and the output of the error detection and correction means is
Write desired data using address information in certain data
Search for the exact position in the recording medium and play back any data
An optical disc reproducing apparatus characterized in that: 3. A data string created by performing a rearrangement operation on the time axis and an operation of adding an error detection and correction code to data to which address information indicating a position of the data in the recording medium is added for each data of a predetermined length is recorded. a main channel which is, data obtained by adding an error detection code to the address information
An information reproducing apparatus for reproducing data from an information recording medium having sub-channels recorded completely independently of the main channel in a time-division manner, comprising : a sub-channel extracting means for separating the data of the sub-channel, the error detecting means for outputting the address information performs error detection of the address information by error detecting code added to the address information in the data of the separated sub-channel And sub-channel data by the sub-channel extracting means.
There a error detection and correction means for outputting data subjected to rearrangement and error detection and correction with respect to separated data, by using the address information of the sub-channel, which is the output of said error detection means, the desired data sequence The approximate position in the recording medium is searched, and the accurate position in the recording medium of the desired data string is searched using the address information in the data output from the error detection and correction means. An information reproducing apparatus for reproducing arbitrary data .