JP3554746B2 - Data recording method, data recording device, and data recording medium - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a data recording method, a data recording device, and a data recording medium, and more particularly to a recording medium such as a CD-ROM (Compact Disk Read Only Memory) which may be erroneously reproduced by an audio reproducing device, and further to these recording media. To effectively avoid accidents when a recording medium is reproduced by mistake.
[0002]
[Prior art]
Conventionally, a CD-ROM and a compact disc are formed so that they can be identified by a control code assigned to a subcode, so that even if a compact disc player is accidentally loaded with a CD-ROM, noise is effectively generated. Has been made so that it can be avoided.
[0003]
That is, in the compact disk and the CD-ROM, a lead-in area, a program area, and a lead-out area are formed in this order from the innermost side, and audio data or user data is recorded in the program area.
[0004]
Of these, the audio data recorded on the compact disc is converted into a recording data string by prescribed data processing and recorded after an error correction code, a subcode and the like are added in a predetermined block unit. On the other hand, user data such as a computer program recorded on a CD-ROM is converted into a prescribed data structure by adding an error correction code or the like in block units, and this data is processed in the same manner as audio data on a compact disc. Is recorded.
[0005]
At this time, these audio data and user data are recorded with sub-code data added thereto, and a control code is assigned to the Q channel of this sub-code. In the case of a compact disc, this control code is set to one of the values “0000”, “1000”, “0001” or “1001”, whereas in the case of a CD-ROM, the value of “01X0” (X is 0 or 1).
[0006]
Assuming this format, as shown in FIG. 3, the compact disc player 1 drives the compact disc 2 to rotate by the spindle motor 3, and in this state, the laser beam of the optical pickup 4 is applied to the information recording surface of the compact disc 2. Collect light. Here, the optical pickup 4 is held so as to be movable in the radial direction of the compact disc 2, so that the compact disc player 1 can move the optical pickup 4 as required to select a desired performance. It is formed so that TOC (Table Of Contents) data and the like can be reproduced from the lead-in area.
[0007]
Further, the optical pickup 4 receives the return light from the compact disk 2 with a plurality of photodetectors, and the compact disk player 1 drives the optical pickup 4 by the servo circuit 5 based on the light reception result to perform tracking control and focus control. . Further, the optical pickup 4 generates a reproduction signal RF whose signal level changes in accordance with the amount of return light from the output signals of the photodetectors, and the amplifier circuit 6 amplifies the reproduction signal RF with a specified gain to obtain a digital signal. Output to the signal processing circuit 7.
[0008]
The digital signal processing circuit 7 is formed of an integrated circuit and operates according to the operation mode set by the system control circuit 8. That is, the digital signal processing circuit 7 detects a reproduction clock from the reproduction signal RF in the EFM (Eight to Fourteen Modulation) demodulation circuit 9 and outputs the reproduction clock to the speed control circuit 10. The speed control circuit 10 drives the spindle motor 3 so that the reproduced clock has a prescribed frequency, whereby the compact disc player 1 drives the compact disc 2 to rotate at a constant linear velocity.
[0009]
Further, the EFM demodulation circuit 9 binarizes the reproduced signal RF, converts it into serial data, and then demodulates and outputs the EFM. The deinterleave circuit 11 stores the output data of the EFM demodulation circuit 9 in a random access memory (RAM) 12 and performs a deinterleave process. Further, the deinterleave circuit 11 outputs the data stored in the random access memory 12 to the CIRC error correction circuit 13, where the data is subjected to an error correction process using an error correction code (that is, a C2 code) defined for the compact disc.
[0010]
As a result, the digital signal processing circuit 7 correctly decodes the audio data, and the compact disc player 1 band-limits the audio data with the following digital filter 14 and then performs digital-to-analog conversion processing in the analog-to-digital conversion circuit 15 to perform audio signal conversion. The SA is output.
[0011]
When outputting the audio signal SA in this manner, the digital signal processing circuit 7 interpolates and outputs audio data for which error correction is difficult in accordance with the operation mode set by the system control circuit 8. Further, when an error occurrence frequency increases due to, for example, a tracking error or the like, the digital signal processing circuit 7 stops outputting the reproduced audio data, and forms a so-called muting state. Through these processes, the generation of abnormal noise can be effectively avoided in the compact disc player 1.
[0012]
Further, the digital signal processing circuit 7 outputs the sub-code data SUB added to the audio data to the system control circuit 8. Accordingly, the system control circuit 8 detects pauses between songs formed in the lead-in area, the lead-out area, and the program area, and mutes the audio data output from the digital signal processing circuit 7 at these timings. . Further, the system control circuit 8 detects the control code of the Q channel described above, and if a CD-ROM is erroneously loaded instead of the compact disk 2, for example, ejects the loaded optical disk and stops the entire operation. Was to be done.
[0013]
[Problems to be solved by the invention]
By the way, the CD-ROM has been proposed so that data of a computer or the like can be recorded using the format of a compact disk. Therefore, there was a time when only compact discs were distributed on the market at first.
[0014]
For this reason, some conventional compact disk players do not have a function of discriminating between a compact disk and a CD-ROM (hereinafter referred to as an old model compact disk player). There was a case where a CD-ROM was reproduced. In this case, since the compact disk player can correct the error of the reproduced data correctly, the reproduction result is output at almost the maximum volume, and there is a problem that a loud noise is generated from the speaker.
[0015]
The present invention has been made in consideration of the above points, and even when a recording apparatus that does not have a function of discriminating between a recording medium on which audio data is recorded and another recording medium is not reproduced by mistake, It is an object of the present invention to propose a data recording method, a data recording device and a data recording medium which can effectively avoid this kind of accident.
[0016]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention forms a first data string with user data and a first error correction code for correcting the error of the user data. In a data recording method for recording, on a prescribed recording medium, a second error correction code for error-correcting a data string of a first data string,But, When an audio data string is recorded in place of the first data string, the audio data string is formed so that the audio data string can be reproduced by an audio reproducing apparatus. The first portion of the first data string is reproduced in a state where a bit error of such a degree that it is difficult to correct the error occurs in the error correction code.Indicates that user data is recordedAn audio data string is inserted between the first data strings so that the audio data string is reproduced.do it,The first data string, the audio data string, and the second error correction code are recorded on a recording medium.In doing so, the data string including the first data string and the second error correction code is recorded with a bit error that is difficult to correct with the second correction code, and recorded.Bit error occurring at the beginning of the first data stringButIn a reproducing apparatus that reproduces user data, the setting is made to such an extent that the first error correction code can correct the error.
[0018]
In the present invention, a warning message notifying that the user data is recorded on the recording medium is used as the audio data string indicating that the user data is recorded.
[0019]
Also, the present inventionData string generating means for generating a first data string by adding a first error correction code for correcting the user data to sequentially input user data; and adding the first data string to the first data string. Recording data string generating means for generating a recording data string by adding a second error correction code for correcting the data string, and recording means for recording the recording data string on a prescribed recording medium; When the audio data string is recorded in place of the first data string, the audio data string is formed so that the audio data string can be reproduced by the audio reproducing apparatus. The beginning of the data sequence is played, followed byIndicates that user data is recordedThe recording data sequence is generated by interposing the audio data sequence between the first data sequences so that the audio data sequence is reproduced, and when the audio reproduction device reproduces the recording data sequence at the beginning of the first data sequence, The second error correction code generates a bit error that is difficult to correct, and when reproduced by a reproducing apparatus that reproduces user data, the first error correction code generates a bit error that can be corrected by the first error correction code. Then, a recording data sequence is generated by intentionally forming a bit error at the head of the first data sequence.
[0021]
Here, a warning message notifying that the user data is recorded on the recording medium is used as the audio data string indicating that the user data is recorded.
[0022]
Further, according to the present invention, for a first data string formed of user data and a first error correction code for correcting the user data, a second error correction for correcting the first data string is performed. When an audio data sequence is recorded in place of the first data sequence on a recording medium of data to which a code is added and the first data sequence is recorded, the audio data sequence can be reproduced by the audio reproducing device. And when played back by the audio playback device, the first part of the first data string is played back, and thenIndicates that user data is recordedAn audio data sequence is interposed between the first data sequences so that the audio data sequence is reproduced, and at the beginning of the first data sequence,When playing back on an audio playback deviceIn the second error correction code, a bit error that is difficult to correct is generated, andWhen played back on a playback device that plays user dataA bit error is intentionally formed at the head of the first data string so that a bit error of such a degree that the first error correction code can correct the error occurs.
[0023]
Here, a warning message notifying that the user data is recorded on the recording medium is used as the audio data string indicating that the user data is recorded.
[0027]
[Action]
A first data string is formed by the user data and a first error correction code for correcting the user data, and the first data string and a second error for correcting the first data string. In a data recording method for recording a correction code on a prescribed recording medium, the recording mediumButWhen an audio data string is recorded in place of the first data string and the audio data string is formed so that the audio data string can be reproduced by the audio reproducing apparatus, the recording medium recorded by the data recording method is used by the audio reproducing apparatus. May be played.here,When the audio data is reproduced by the audio reproducing apparatus, the first portion of the first data string is reproduced in a state where a bit error that is difficult to correct with the second error correction code has occurred.Indicates that user data is recordedThe audio data sequence is interposed between the first data sequences so that the audio data sequence is reproduced, and a bit error is intentionally formed to form the first data sequence, the audio data sequence, and the second error correction. If the code is recorded on the recording medium, the audio output is performed for the head of the first data sequence by the muting process of the audio reproducing device.Avoid, indicating that the following user data is recordedAudio dataOutput. At this time, a bit error occurring at the head of the first data stringButThe degree to which the first error correction code can correct an error in a reproducing apparatus for reproducing user data.By beingIn the playback device that plays back this user data,Is played.
[0029]
Further, in these cases, if the specified audio data string is a warning message notifying that the user data is recorded on the recording medium, a warning is generated when the audio data is reproduced by the audio reproducing apparatus by mistake. You can call attention.
[0030]
A data string generating means for adding a first error correction code for correcting the user data to the sequentially input user data to generate a first data string; A recording data sequence generating means for generating a recording data sequence by adding a second error correction code for correcting the first data sequence, and a recording means for recording the recording data sequence on a prescribed recording medium. In the data recording device, when the recording medium is formed so that the audio data sequence can be reproduced by the audio reproducing device when the audio data sequence is recorded instead of the first data sequence, the recording is performed by the data recording device. The recorded recording medium may be erroneously reproduced by the audio reproducing device. As a result, when reproduced by the audio reproducing apparatus, the head portion of the first data sequence is reproduced by the recorded data sequence generating means, and subsequently,Indicates that user data is recordedIf the recording data sequence is generated by interposing the audio data sequence between the first data sequences so that the audio data sequence is reproduced, the voice data sequence can draw attention. Further, when reproduced by an audio reproducing apparatus, a bit error is generated in such a degree that it is difficult to correct the error with the second error correcting code, and when reproduced by a reproducing apparatus for reproducing user data, an error is generated by the first error correcting code. If the recording data sequence is generated by intentionally forming a bit error at the head of the first data sequence so that a bit error of a correctable level occurs, the first data sequence is reproduced when reproduced by the audio reproducing apparatus. Generation of noise due to high volume can be effectively avoided at the head of the column, and when reproduced by a reproducing device that reproduces user data, user data can be correctly reproduced at the head of the first data column.
[0032]
Further, in these cases, if the specified audio data string is a warning message informing that the user data is recorded on the recording medium, a warning is issued when the audio data is reproduced by the audio reproducing apparatus by mistake. Can alert you.
[0033]
Further, for a first data string formed of user data and a first error correction code for correcting the user data, a second error correction code for correcting the first data string is used. In addition, on the recording medium of the data in which the first data string is recorded, the data is formed so that the audio data string in which the audio data string is recorded instead of the first data string can be reproduced by the audio reproducing device. In such a case, it is conceivable that the data recording medium is erroneously loaded by the audio reproducing apparatus. Thereby, when the audio data is reproduced by the audio reproducing device, the head of the first data string is reproduced, and subsequently,Indicates that user data is recordedIf an audio data sequence is interposed between the first data sequences so that the audio data sequence is reproduced, the voice data can call attention. In addition, when the audio data is reproduced by the audio reproducing apparatus, a bit error of such a degree that it is difficult to correct the error occurs with the second error correction code. If a bit error is intentionally formed at the head of the first data string so that a bit error that can be corrected by the code is generated, noise at the head of the first data string due to loud sound is generated. Can be effectively avoided, and when reproduced by a reproducing apparatus that reproduces user data, the user data can be correctly reproduced at the head of the first data string.
[0034]
In addition, if the specified audio data string is a warning message notifying that the user data is recorded on the recording medium, it is possible to surely call attention.
[0035]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
[0036]
FIG. 1 is a block diagram showing a CD-ROM mastering device according to this embodiment. In the manufacturing process, the mastering device 20 first exposes the glass master 21 to start manufacturing the CD-ROM. Here, the glass master 21 is formed by applying a photoresist by spin coating on a glass substrate whose flatness and smoothness are controlled.
[0037]
The mastering device 20 rotationally drives the glass master 21 by a spindle motor (not shown), and moves the irradiation position of the laser beam L1 from the inner peripheral side to the outer peripheral side of the glass master 21 at a predetermined speed by a predetermined feed mechanism. In the state where the glass master 21 is driven under the prescribed conditions in this way, the mastering device 20 transmits the user data DU for recording prepared in advance by the editing device or the like from the data storage or the like to the error detection code circuit (EDC: Error). Detecting Code) 22.
[0038]
In this embodiment, the user data DU is data forming a computer program, and is used by being downloaded from a CD-ROM to a hard disk device built in the computer, for example.
[0039]
The error detection code circuit 22 adds a sync and a header to the user data DU in a predetermined block unit (that is, in units of 2048 [bytes]), and further generates an error detection code used for error detection in each block unit. It is added to the user data DU. A subsequent error correction code circuit (ECC: Error Correcting Code) 23 adds an error correction code used for error correction to the output data of the error detection code circuit 22 and outputs the data.
[0040]
The scramble circuit 24 scrambles the data output from the error correction code circuit 23 except for the sync in block units and outputs the data. Thereby, the mastering device 20 converts the user data DU into a data structure defined for the CD-ROM.
[0041]
Further, the operation of the scramble circuit 24 is switched by the system control circuit 25, and the audio data DA is scrambled at a prescribed timing in place of the output data of the error correction code circuit 23 and output. Here, this audio data DA is formed such that a warning message "This disc is a CD-ROM. Stop playback" is repeated for a prescribed time.
[0042]
On the other hand, the system control circuit 25 controls the entire operation, and after recording the data of the lead-in area on the glass master 21 and subsequently recording the data of the head portion of the user data DU, the audio data DA The operation of the scramble circuit 24 is switched to record. Further, after recording the audio data DA, the system control circuit 25 switches the operation of the scramble circuit 24 again so as to record the subsequent user data DU.
[0043]
As a result, as shown in FIG. 2, in this embodiment, the audio data DA is recorded between the user data DU1 and DU2 in the program area of the CD-ROM (FIG. 2A). )).
[0044]
Here, the user data DU1 recorded on the inner circumference side of the audio data DA is assigned data specifying access to the subsequent user data DU2, such as partition information and volume information, in accordance with the format of the user data DU. In this embodiment, data such as partition information and volume information are set in advance at the time of editing so that the user data DU2 can be correctly accessed even if the audio data DA is inserted. .
[0045]
The seek circuit 26 adds an error correction code (CIRC: Cross Interleave Reed-Solomon Code) specified for the compact disc to the output data of the scramble circuit 24, and interleaves and outputs the output data. Further, the circ circuit 26 is controlled by the system control circuit 25 to generate a C2 error at a prescribed bit error rate when generating an error correction code for the user data DU1 recorded on the inner side of the audio data DA. To generate an error correction code.
[0046]
That is, when a CD-ROM having a bit error intentionally reproduced in such a manner is reproduced by an old model compact disc player, if the frequency of the bit error is low, data which cannot be corrected even by the old model compact disc player is interpolated. It will be processed and output. On the other hand, when the frequency of this bit error increases, the compact disk player mutes the output of the audio data itself.
[0047]
Therefore, if this bit error rate is set to a specified value or more, the compact disk player of the old model reproduces the lead-in area in a muted state and then reproduces the subsequent user data DU1 in a muted state. Become. Further, the compact disk player of the old model subsequently normally reproduces the audio data DA, and then reproduces the subsequent user data DU2 in a state almost at the maximum volume (FIG. 2 (D)).
[0048]
Thus, when the CD-ROM created by the mastering device 20 is played back by a compact disk player having no function of discriminating between a compact disk and a CD-ROM, a warning message is first issued to warn the user. The message can be prompted (FIG. 2 (C)), and the reproduction can be stopped by this message to effectively avoid the generation of loud noise.
[0049]
On the other hand, when the data is reproduced by the CD-ROM drive, the error can be corrected by the error correction code enhanced for the CD-ROM, and a warning message is generated according to the resulting data such as the partition information and the volume information. By jumping the recorded area, the subsequent user data DU2 can be reproduced (FIG. 2B).
[0050]
That is, the CD-ROM converts the user data DU into a data structure specified for the CD-ROM by adding an error correction code or the like to the user data DU, and then specifies a data sequence of the data structure for the compact disc. The data is converted into a data structure and recorded.
[0051]
Therefore, if the bit error is minor, the reproduced user data DU is subjected to error correction processing using an error correction code (CIRC) specified for a compact disc. On the other hand, when the bit error is severe, the reproduced user data cannot be completely corrected by the error correction code specified for the compact disk, but is corrected by the enhanced error correction code for the CD-ROM. Will be. Further, when the bit error becomes more severe, the reproduced user data cannot be corrected even with the error correction code enhanced for the CD-ROM.
[0052]
For this reason, in this embodiment, the frequency of the bit error is such that it is difficult to correct the error with the error correction code specified for the compact disk (that is, it becomes a C2 error) and the error correction code enhanced for the CD-ROM is used. Is set to a frequency that allows error correction. As a result, the mastering device 20 records the user data DU so that the significant data necessary for processing the user data DU can be reliably recorded and reproduced by effectively utilizing the double enhanced error correction code.
[0053]
Accordingly, the mastering device 20 generates a drive signal S1 for laser beam modulation by adding a subcode SUB to the output data of the circuit 26 in the modulation circuit 27, and generates a drive signal S1 for laser beam modulation. The laser beam L1 of the gas laser 29 is turned on / off by the drive signal S1. Further, the mastering device 20 focuses the laser beam L1 on the information recording surface of the glass master 21 via the optical system, and records the information on the glass master 21 according to the user data DU in accordance with the format specified in the CD-ROM. Expose the surface.
[0054]
Thus, when the glass master 21 is exposed in this way, the manufacturing process of the CD-ROM produces a metal disk in which pits are sequentially formed on a glass substrate through a subsequent development process and an electroforming process. A master disc is used as a master disc, and a CD-ROM is created from the mother disc. Therefore, in the CD-ROM, pits are sequentially formed so as to correspond to the drive signal S1, and necessary information is recorded.
[0055]
In the above configuration, the user data DU to be recorded is added with a sync and a header in predetermined block units in the error detection code circuit 22, further added with an error detection code used for error detection, and After an error correction code used for error correction is added by the encoding circuit 23, the signal is scrambled by the scramble circuit 24.
[0056]
At this time, in accordance with the format, audio data DA formed by a warning message is inserted following data DU1 specifying access to the subsequent user data DU2, such as partition information and volume information, according to the format. In the subsequent circulating circuit 26, an error correction code (CIRC) specified for the compact disk is added and interleaved.
[0057]
When an error correction code is added in the circ circuit 26, the user data DU can correct the first user data DU1 with an error correction code enhanced for a CD-ROM and an error correction code specified for a compact disk. A bit error is intentionally formed to such an extent that it is difficult to correct the code, and is subsequently converted into a drive signal S1 consisting of a recording data string. The laser signal L1 is turned on / off by this drive signal S1 and recorded on the glass master 21. .
[0058]
As a result, a metal disk in which pits are sequentially formed on a glass substrate through a subsequent development process and an electroforming process is created in the process of creating a CD-ROM. From the CD-ROM.
[0059]
When the CD-ROM thus formed is erroneously loaded into a compact disc player having a function of discriminating between a compact disc and a CD-ROM and reproduced, the control code specified in the subcode is used. It is determined that the disc is a CD-ROM, so that the generation of a loud sound can be effectively avoided.
[0060]
Also, in the case where an old compact disc player which does not have a function of discriminating between a compact disc and a CD-ROM is erroneously loaded and played, the user data is reproduced after the lead-in area is muted. The head part DU1 of the DU is reproduced in a muted state because a bit error for which error correction is difficult occurs at a high frequency, and then a warning message is reproduced. If the old compact disc player is loaded by mistake and played back, this warning message will alert the user before a loud sound is generated, thereby enabling the loud sound to be generated. Can be avoided.
[0061]
On the other hand, in the case of reproduction by the CD-ROM drive, after the lead-in area is reproduced, the recording area of the audio data DA is changed according to the partition information, volume information, and the like assigned to the head part DU1 of the user data DU. The user data DU2 is jumped and reproduced as necessary, whereby the user data DU2 is reproduced in the same manner as a conventional CD-ROM, and for example, a computer program or the like can be downloaded.
[0062]
According to the above configuration, the audio data DA formed by the warning message is recorded following the data DU1 specifying the access of the user data DU2, and the first user data DU1 is enhanced for the CD-ROM. A bit error is intentionally formed to the extent that it can be corrected by the error correction code and it is difficult to correct with the error correction code specified for compact discs. Before the volume is generated, an audio warning can be generated to alert the user, thereby making it possible to effectively avoid generating a large volume.
[0063]
In the above embodiment, the case where audio data is simply recorded following data such as partition information and volume information has been described. However, the present invention is not limited to this, and data such as partition information and volume information is repeatedly recorded. May be. That is, if a bit error is intentionally formed in this way, the margin for the original bit error is reduced accordingly. As a result, this kind of data can be repeatedly recorded to secure the margin of loss.
[0064]
Further, in the above-described embodiment, the case where the audio data is inserted at one place at the head of the CD-ROM has been described. However, the present invention is not limited to this, and a plurality of places may be inserted. That is, some compact disc players have a so-called program playback function. In this program playback, the performances selected by the user are played back in the order of selection according to the TOC. Therefore, if only one audio data is inserted at the beginning of the CD-ROM, a loud noise may be suddenly generated in such a program reproduction without issuing an audio warning. Thus, this type of accident can be reduced by inserting warning messages at a plurality of locations corresponding to the file specified by the TOC pointer.
[0065]
Further, in the above-described embodiment, a case has been described in which a computer program is assigned as user data. However, the present invention is not limited to this, and can be widely applied to the case of recording text data, image data, and the like.
[0066]
Further, in the above-described embodiment, a case has been described in which, in the mastering apparatus, user data is converted into a data structure specified for a CD-ROM, and then data processing specified for a compact disc is executed. However, the present invention can be widely applied to a case where these processes or a part of these processes are executed on the editing device side.
[0067]
Further, in the above-described embodiment, a case has been described in which the present invention is applied to effectively prevent the generation of a large sound volume when the compact disc player is loaded on an old model compact disk player. However, the present invention is not limited to this. It can also be used to detect so-called pirated versions. That is, for a CD-ROM in which a bit error is intentionally formed to such an extent that an error can be corrected by the error correction code enhanced for the CD-ROM and the error correction code specified for the compact disk is difficult to correct, for example, SCSI In the case of copying via a (Small Computer System Interface), it is difficult to copy the bit error formed intentionally.
[0068]
Therefore, the pirated copy copied in this manner is reproduced by the compact disc player, and suddenly a large volume is generated, followed by an audio warning, whereby it is possible to easily identify whether the copy is a pirate or not. it can.
[0069]
Further, in the above embodiment, the case where the present invention is applied to a CD-ROM has been described. However, the present invention is not limited to this, and can be widely applied to various data recording devices and the like. That is, recording media such as digital audio tape recorders and minidiscs (registered trademark of Sony Corporation) have almost the same external appearance as the recording media for these audio devices, and are used for data storage. Exists. Therefore, it is conceivable that these data storage recording media and the like may be erroneously loaded into the audio playback device and played back, and the present invention can be applied to effectively prevent generation of a large volume.
[0070]
【The invention's effect】
As described above, according to the present invention, a bit error is intentionally formed to such an extent that it is difficult to correct an error when reproduced by an audio reproducing apparatus, and to an extent that an error can be corrected when reproduced by a reproducing apparatus that reproduces user data. After that, by successively recording audio data and user data, when erroneously playing back on an audio device that does not have a recording medium identification function, an audio warning is generated before generating a high volume. This can call attention, thereby effectively avoiding generation of a large volume.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a mastering device according to an embodiment of the present invention.
FIG. 2 is a schematic diagram for explaining a reproduction process of a CD-ROM created by the mastering device of FIG. 1;
FIG. 3 is a block diagram showing a compact disc player.
[Explanation of symbols]
1 Compact Disc Player, 2 Compact Disc, 3 Spindle Motor, 8, 25 System Control Circuit, 22 Error Detection Code Circuit, 23 Error Correction Code Circuit, 24 Scramble Circuit, 26 Sark Circuit, 27 Modulation Circuit

Claims (6)

A first data string is formed from user data and a first error correction code for correcting the user data, and the first data string and a second error for correcting the first data string are corrected. In a data recording method of recording a correction code and a prescribed recording medium,
The recording medium,
When an audio data sequence is recorded instead of the first data sequence, the audio data sequence is formed so as to be reproduced by an audio reproducing device;
The data recording method includes:
When the audio data is reproduced by the audio reproducing apparatus, the first part of the first data string is reproduced in a state where a bit error that is difficult to correct is generated by the second error correction code, and then the user data is recorded. So that the audio data string indicating that the
Inserting the audio data sequence between the first data sequences to record the first data sequence, the audio data sequence and the second error correction code on the recording medium,
Recording a data string including the first data string and the second error correction code with a bit error that is difficult to correct with the second correction code;
The bit error occurring at the head of the first data string is:
In a reproducing apparatus for reproducing the user data, a data recording method is set so that an error can be corrected by the first error correction code. 2. The data recording method according to claim 1, wherein the audio data string is a warning message notifying that user data is recorded on the recording medium. Data string generating means for adding a first error correction code for error correcting the user data to sequentially input user data to generate a first data string;
Recording data string generating means for generating a recording data string by adding a second error correction code for correcting the first data string to the first data string;
Recording means for recording the recording data string on a prescribed recording medium,
The recording medium,
When an audio data sequence is recorded instead of the first data sequence, the audio data sequence is formed so as to be reproduced by an audio reproducing device;
The recording data string generating means includes:
When the audio data is reproduced by the audio reproducing apparatus, the first data string is reproduced so that the head of the first data string is reproduced, and then the audio data string indicating that the user data is recorded is reproduced. Generating the recording data sequence by interposing the audio data sequence between the columns,
At the beginning of the first data string, when reproduced by the audio reproducing apparatus, a bit error of such a degree that error correction is difficult with the second error correction code occurs, and the reproducing apparatus reproduces the user data. When the data is reproduced, the recording data sequence is generated by intentionally forming a bit error at the head of the first data sequence so that a bit error that can be corrected by the first error correction code is generated. A data recording device, comprising: 4. The data recording apparatus according to claim 3, wherein the audio data string is a warning message notifying that user data is recorded on the recording medium. A second error correction code for correcting the first data sequence is added to a first data sequence formed of user data and a first error correction code for correcting the user data. A data recording medium on which the first data string is recorded;
When an audio data string is recorded in place of the first data string, the audio data string is formed so as to be reproduced by an audio reproducing device;
When the audio data is reproduced by the audio reproducing apparatus, the first data string is reproduced so that the head of the first data string is reproduced, and then the audio data string indicating that the user data is recorded is reproduced. The audio data sequence is interposed between the columns,
At the beginning of the first data string, when reproduced by the audio reproducing apparatus, a bit error of such a degree that error correction is difficult with the second error correction code occurs, and the reproducing apparatus reproduces the user data. A bit error is intentionally formed at the head of the first data string so that when reproduced, the first error correction code generates a bit error to the extent that an error can be corrected. Recording medium. 6. The data recording medium according to claim 5, wherein the audio data string is a warning message notifying that user data is recorded on the recording medium.

Images