JP3404171B2 - Digital signal recording method and reproduction method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital signal recording method and a reproducing method, and more particularly to a digital signal for recording a digital signal having a structure in consideration of rewriting of recorded data and reproducing the digital signal from a disc. The present invention relates to a recording method and a reproducing method.

[0002]

2. Description of the Related Art Conventionally, a compact disc has been mentioned as a disc on which this kind of digital signal is recorded. With this compact disc, only the sync signal block consisting of valid data is continuously recorded, as in the technology described in "From CD Audio to PC, edited by Mario Fujio and edited by Kenji Hayashi, Corona Publishing Co. 13p-15p". It was supposed to be done.

[0003]

When a digital signal recorded by the above technique is recorded on a recordable disc and the recorded data is rewritten, the recorded signal is disturbed when switching from reproduction to recording. There is a problem.

An object of the present invention is to solve the above problems and provide a digital signal recording method and a reproducing method capable of switching from reproduction to recording when rewriting data.

[0005] In the present invention, in order to solve the above problem, de
Data, and an identification signal indicating whether the data is valid or invalid,
Of a data block having the data and the identification signal
The sync signal block that consists of
When recording on a disc, a valid data containing valid data
When recording a data sync signal block, the valid data
The effective signal synchronization while recording the synchronization signal block
It has the same format as the signal block and contains invalid data and data.
And an identification signal indicating that the data is invalid
Record the invalid data sync signal block of .

Further, at the time of reproduction, if the identification signal in the sync signal block indicates a sync signal block of invalid data, the sync signal block is ignored and reproduced.
Or, des - data is used synchronization signal shows the valid or invalid, valid data sync signal block having valid data
When recording, record the valid data sync signal block.
Recorded and have the same shape as the valid data sync signal block
It is an expression and the invalid data and data are invalid.
And one type of invalid data sync signal having a sync signal indicating
Record the block . When playing a disc recorded in this way, depending on the detection result of the sync signal ,
Valid data sync signal blocks to be ignored and invalid data blocks to be ignored.
Data sync signal block is judged and the valid data to be reproduced is
Data sync signal block .

[0007]

According to the present invention, a sync signal block composed of invalid data of the same type as the sync signal block is inserted and recorded between data frames composed of a plurality of sync signal blocks. At the time of editing (during rewriting), the rewriting operation of the data in the data frame is switched in the sync signal block of the first invalid data immediately after the end of the data frame, so that the rewriting portion Only can be rewritten correctly.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of a digital signal recording method of the present invention, in which a sync signal 101 indicating a boundary of a data block and the content of the data of the data block are identified. The identification signal 102 and the data 103 form a synchronization signal block 104. This synchronization signal block 104
A plurality of data frames are collected to form a data frame. Also, during recording, the sync signal block 10 is provided between the data frames.
It has the same type as 4 and invalid data is stored in the area for storing data.
Data is stored to form a sync signal block, and two invalid data sync signal blocks are inserted and recorded.

The detailed structure of the sync signal block 104 shown in FIG. 1 will be described with reference to FIG.

FIG. 2 shows an example of the structure of the sync signal block. An identification flag indicating whether the data contained in the data area is valid or invalid is inserted in the identification signal storage area.
For example, when the value of this identification flag is 0, it indicates that the data in the sync signal block is valid, and when it is 1, it indicates that the data is invalid. This makes it possible to distinguish between the data frame and the invalid data synchronization signal block.

The mode of switching the rewriting operation of the data in the data frame when the block data having the above-described structure is used for editing and rewriting will be described with reference to FIG. In FIG. 3, FIG. 3A shows a plurality of sync signal blocks before rewriting, and FIG. 3B shows a rewriting operation. In the data rewriting operation, as shown in (b), during the reproduction of (a), a sync signal block in which invalid data is stored is detected by an identification flag, and the invalid data sync signal block is detected. The recording is started by switching the reproduction and the rewriting from the middle of the first block included in. Record the data before rewriting.
In order to ensure that there are two invalid data synchronization signal blocks between the data frame and the rewritten data frame, one invalid block is recorded and then the data frame is recorded. Make a record of. When the recording is finished, the recording is finished at the first block in the invalid data synchronization signal block to be finished, and the disturbance of the recording signal due to the switching between the reproduction and the rewriting is eliminated.

FIG. 4 is a diagram showing a reproducing method when reproducing a digital signal recorded on a disc. At the time of reproduction, the identification flag recorded in the identification signal is detected for each sync signal block. When the detected flag is 0, it is judged as a data frame and the reproduction is continued. When the flag 1 is detected, it is determined that the block is an invalid data synchronization signal block, and reproduction is not performed and it is ignored. If the subsequent flag is 0, the reproduction is restarted.

As described above, in this embodiment, a sync signal block composed of invalid data of the same type as the sync signal block is inserted between the data frames composed of a plurality of sync signal blocks. Recorded and edited (when rewriting)
It is possible to correctly rewrite only the rewritten portion by switching the data frame data rewriting operation within the first invalid data sync signal block immediately after the end of the data frame. it can.

When this signal is recorded on a disk and reproduced, an invalid data synchronizing signal block is detected by detecting the identification flag, and the data of this portion is not reproduced but can be reproduced by ignoring it. Becomes

In the above embodiment, the number of sync blocks to be inserted into the area of the invalid data sync signal block is two, but the number of insert blocks is not limited to this.

FIG. 5 is a diagram showing another embodiment of the digital signal recording method of the present invention, in which the first synchronizing signal 501 indicating the boundary of the data block and the synchronizing signal block from the data are formed. Constitute.

A plurality of the synchronization signal blocks are collected and data is collected.
Configure the tough frame.

Further, at the time of recording, during this data frame, the same type as the synchronizing signal block is used, and invalid data is stored in the area for storing data, and invalid data is stored. A second sync signal 502 having a sync pattern different from that of the sync signal 501 to indicate that the block is a sync signal block.
Is added to form a synchronizing signal block, and two consecutive blocks are added to record an invalid data synchronizing signal block.

The manner of switching the rewriting operation of the data in the data frame when editing and rewriting with the block data having the configuration shown in FIG. 5 described above will be described with reference to FIG. In FIG. 6, FIG. 6A shows a plurality of sync signal blocks before rewriting, and FIG. 6B shows a rewriting operation. De-
The data rewriting operation is as shown in (b) during playback of (a),
A sync signal block in which invalid data is stored is detected by detecting the second sync signal, and reproduction and rewriting are switched from the middle of the first block included in the invalid data sync signal block. And start recording.

The recording is performed so that two invalid data synchronizing signal blocks always exist between the data frame before rewriting and the rewritten data frame.
After recording one invalid block, the data frame is recorded. When the recording is finished, the recording is finished at the first block in the invalid data synchronization signal block to be finished, and the disturbance of the recording signal due to the switching between the reproduction and the rewriting is eliminated.

FIG. 7 is a diagram showing a reproducing method when reproducing the digital signal recorded on the disk with the configuration of FIG. At the time of reproduction, the sync signal of the sync signal block is detected. If the detected sync signal is the first sync signal, it is judged as a data frame and the reproduction is continued as it is. If the detected sync signal is the second sync signal, it is judged to be an invalid data sync signal block and is not reproduced and ignored. If the sync signal detected thereafter is the first sync signal, the reproduction is restarted.

Therefore, in this embodiment, a second sync signal of the same type as that of the sync signal block is provided between the data frames composed of a plurality of sync signal blocks consisting of the first sync signal and data. And a sync signal block consisting of invalid data is inserted and recorded. When editing (rewriting), the data is recorded.
Switching the rewriting operation of the data of the taframe
By executing the synchronization signal block of the first invalid data immediately after the end of the tuple frame, only the rewriting portion can be rewritten correctly.

[0024] When playing a disc which this signal has been recorded, the reproduction by the detection of the second sync signal to detect invalid data synchronization signal block, ignoring without playback of data of this portion It will be possible.

In the above embodiment, the number of sync blocks to be inserted into the area of the invalid data sync signal block is two, but the number of insert blocks is not limited to this.

Further, although each sync signal added to a plurality of invalid data sync signal blocks inserted between data frames has the same sync pattern, it is the first one for starting reproduction and rewriting and ending recording. The second synchronization signal may be added as a synchronization signal of the invalid data synchronization signal block of No. 3, and the third synchronization signal may be added as a synchronization signal of the subsequent invalid data synchronization signal block for recording.

[0027]

As described above, according to the present invention, a sync signal block consisting of invalid data of the same type as the sync signal block is provided between data frames composed of a plurality of sync signal blocks. Is inserted and recorded, and during the editing (rewriting), the switching of the data frame data rewriting operation is performed in the sync signal block of the first invalid data immediately after the end of the data frame. By doing so, only the rewritten portion can be rewritten correctly.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a digital signal recording method according to the present invention.

FIG. 2 is a diagram showing a configuration of a sync signal block in the embodiment shown in FIG.

FIG. 3 is a diagram showing how data frame data rewriting operation is switched in the embodiment shown in FIG.

FIG. 4 is a diagram showing how the disc recorded in the embodiment shown in FIG. 1 is reproduced.

FIG. 5 is a diagram showing a configuration of a second embodiment of a digital signal recording method according to the present invention.

FIG. 6 is a diagram showing how the data frame data rewriting operation is switched in the embodiment shown in FIG.

FIG. 7 is a diagram showing how the disc recorded in the embodiment shown in FIG. 5 is reproduced.

[Explanation of symbols]

101 ... Sync signal, 102 ... Identification signal, 103 ... Data
104, sync signal block, 105 ... invalid data,
501 ... 1st synchronizing signal, 502 ... 2nd synchronizing signal.

Continued front page    (72) Inventor Masafumi Nakamura               292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa               Ceremony company Hitachi Ltd. multimedia system               Inside the development headquarters (72) Inventor Yu Nagai               292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa               Ceremony company Hitachi Ltd. multimedia system               Inside the development headquarters (72) Inventor Masayuki Hirabayashi               292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa               Ceremony company Hitachi Ltd. multimedia system               Inside the development headquarters (72) Inventor Toshifumi Takeuchi               292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa               Ceremony company Hitachi Ltd. multimedia system               Inside the development headquarters                (56) Reference JP-A-4-212757 (JP, A)                 JP 62-137767 (JP, A)                 JP-A-5-250814 (JP, A)                 JP-A-5-20796 (JP, A)

Claims (6)

(57) [Claims] 1. A data recording method for recording data on a disc in sync signal block units, wherein the sync signal block comprises data, an identification flag indicating whether the data is valid or invalid, and the data. And the identification flag
And a sync signal indicating a boundary of a data block having a flag. When recording a valid data sync signal block having valid data on the disc, the valid data sync signal block is recorded together with the valid data sync signal block. Data recording characterized by recording one kind of invalid data synchronization signal block having the same format as the valid data synchronization signal block and having invalid data and an identification flag indicating that the data is invalid Method. 2. The data recording method according to claim 1, wherein two or more blocks of the invalid data synchronization signal block are recorded. 3. The data recording method according to claim 1, wherein the recording of the valid data synchronization signal block starts a rewriting operation in the already recorded invalid data synchronization signal block. Method. 4. A sync signal block having data, an identification flag for identifying the content of the data, and a sync signal indicating the boundary of a data block having the data and the identification flag is recorded. A data reproducing method for reproducing data from a disc, wherein a valid data sync signal block having valid data, the valid data sync signal block having the same format as the valid data sync signal block, and an invalid data Data and one type of invalid data sync signal block having an identification flag indicating that the data is invalid are recorded, and the valid data sync signal block to be reproduced is ignored according to the detection result of the identification flag . A method for reproducing data, characterized in that the effective data synchronization signal block to be reproduced is reproduced by determining that it is an invalid data synchronization signal block to be reproduced. 5. A data recording method for recording data on a disc in sync signal block units, wherein the sync signal block comprises data and a sync signal indicating whether the data is valid or invalid. When recording a valid data synchronization signal block having valid data on a disc, the valid data synchronization signal block is recorded, and an invalid data synchronizing signal block having the same format as the valid data synchronization signal block is also recorded. And a sync signal indicating that the data is invalid, a single type of invalid data sync signal block is recorded. 6. A data reproducing method for reproducing data from a disc on which a sync signal block having data and a sync signal indicating whether the data is valid or invalid is recorded. One type of invalid data having a valid data sync signal block having valid data and a sync signal having the same format as the valid data sync signal block and indicating invalid data and invalid data A sync signal block is recorded, and a valid data sync signal block to be reproduced is determined according to the detection result of the sync signal by determining a valid data sync signal block to be reproduced and an invalid data sync signal block to be ignored. A data reproducing method characterized by reproducing the data.