JP2004192678A - Recording medium, recording/reproducing apparatus, and reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an improper recording/reproducing operation by an existing device while fully carrying out the protection of copyrights. <P>SOLUTION: A media ID area E is assigned to a TOC area of an existing MD. In the media ID area, grooves are formed radially from the center of a disk and the media ID is recorded by these grooves. In an MD device corresponding to the MD, the media ID area E is scanned with tracking OFF and the media ID data are read from the area concerned. Recording data are enciphered with a read media ID and recorded in a recordable area C. If this MD is loaded on the existing MD device, the media ID area E is read as a TOC area in advance of the recording/reproducing operation, but tracking does not start and the MD is ejected. Thereby, the improper recording/reproducing operation can be prevented. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a recording medium, a recording / reproducing device, and a reproducing device, and is particularly suitable for use when adding information for copyright protection or the like to an existing recording medium.
[0002]
[Prior art]
As a recording medium for digital recording, an MD (Mini Disc) is widely used. This MD is rapidly becoming widespread as a replacement for existing tape media due to its small size, light weight, excellent formability, and realization of a long time while suppressing sound quality deterioration by data compression technology. In addition to audio recording, standards for MD data for data recording and MD pictures for still image recording have been announced.
[0003]
The configuration of an existing MD and its recording / reproducing apparatus is described in Non-Patent Document 1 below, for example. Hereinafter, the configuration of an existing MD and its recording / reproducing apparatus will be described with reference to FIGS.
[0004]
FIG. 9 shows the configuration of an existing MD disc.
[0005]
The MD disc is roughly divided into a TOC (Table of Contents) area and a recordable area. Of these, pre-pits are formed in a spiral track shape in the TOC area, and information such as disc recording time difference and recording laser power is recorded by the pre-pits. In the recordable area, a guide groove is formed in a spiral track shape, and information is magneto-optically recorded on the guide groove. The guide grooves meander (wobble) in a radial direction at a predetermined frequency, and the absolute address (address) on the track is recorded by the wobble frequency.
[0006]
Further, a UTOC (User Table of Contents) area is allocated to the innermost peripheral position of the recordable area, and a start address and a disc name of a recorded music piece, a title of each music piece, an artist name, and the like are assigned to the UTOC area. Is magneto-optically recorded. Then, audio information as recording information is recorded in an area following the UTOC in the recordable area.
[0007]
FIG. 10 shows a configuration diagram of an MD device for recording and reproducing information on the MD disk.
[0008]
In the figure, an ECC encoder 1 adds an error correction code to recording data. The modulation circuit 2 performs a modulation process such as NRZI plus on the recording data added with the error correction code. The drive signal generation circuit 3 converts the modulated recording data into a recording signal. The magnetic head drive circuit 4 drives the magnetic head 4 according to a drive signal, and applies a magnetic field to the disk 200 according to a recording signal. The laser drive circuit 6 causes the semiconductor laser 71 to emit a pulse beam corresponding to the recording laser power or a continuous beam corresponding to the reproduction laser power.
[0009]
The pickup 7 includes a semiconductor laser 71 that emits laser light according to control from the laser drive circuit 6, a photodetector 72 that receives light reflected from the disk 200, and an object for converging the laser light to a track on the disk. An optical system for guiding the laser light from the lens and the semiconductor laser 71 to the objective lens and the photodetector is provided.
[0010]
The reproduction signal amplification circuit 8 performs arithmetic processing on the sensor output from the photodetector 72 to generate and output signals such as an RF signal, a tracking error signal, and a focus error signal. The waveform generation circuit 9 shapes the waveform of the reproduction RF signal from the reproduction signal amplification circuit 8 and outputs the resultant signal to the decoding circuit 10. The decoding circuit 10 performs processing such as Viterbi decoding and NRZI plus demodulation on the waveform-shaped RF signal to generate read data.
[0011]
The ECC decoder 11 performs an error correction process on the read data from the decoding circuit 10 using an error correction code to generate reproduced data. The reproduction circuit 12 performs processing such as DA conversion on the reproduction data from the ECC decoder 11 to generate a reproduction signal, and supplies this to a speaker.
[0012]
The clock signal generation circuit 13 generates a recording / reproduction clock based on the RF signal or the tracking error signal from the reproduction signal amplification circuit 8. The address generation circuit 14 reproduces the address recorded by the wobble of the guide groove based on the tracking error signal from the reproduction signal amplification circuit 8.
[0013]
The servo circuit 15 generates a tracking servo signal and a focus servo signal based on the tracking error signal and the focus error signal from the reproduction signal amplifying circuit 8 and supplies them to the servo mechanism 16. Further, a disk rotation control signal is generated based on a clock from the clock signal generation circuit 13 and supplied to the spindle motor 17. The servo mechanism displaces the objective lens in the pickup 7 in the focus direction and the tracking direction according to the servo signal from the servo circuit 15, thereby causing the laser light from the pickup 7 to converge and follow the track.
[0014]
FIG. 11 shows a flowchart of a process executed prior to the recording / reproducing operation in the MD device.
[0015]
When the MD cartridge is mounted on the MD device (S401), the pickup 7 is moved to the innermost position of the disk, that is, the TOC area (S402), and the focus trial (S403) and the tracking adjustment (S404) are executed. If an error occurs in either the focus trial or the tracking adjustment, the MD cartridge is ejected, and the process ends. On the other hand, if both the focus trial and the tracking adjustment are good, the TOC information is read from the TOC area and stored in a memory (omitted in FIG. 2) in the MD device (S405). Then, a recording or reproducing operation is performed in response to a user's instruction input (S406).
[0016]
[Non-patent literature]
"All of MD" published by Dempa Shimbun (published second edition on September 20, 1999)
[0017]
[Problems to be solved by the invention]
In the MD, since the information is digitized and recorded, it is possible to easily make a copy while maintaining high sound quality. Therefore, in MD, in order to prevent such digital copying and properly protect the rights of the author, SCMS (Serial Copy Management System) is adopted, and digital copying is limited to only one generation. . Information on SCMS is recorded in the UTOC area of the MD.
[0018]
However, since the SCMS information is magneto-optically recorded, if the SCMS information is also copied at the same time, the above-described copy restriction becomes ineffective. For example, if the SCMS information is set in a state where digital copying of one generation is possible, and the recording information including the UTOC information is copied to another MD, a further copy is generated using the copy MD. Will be tolerated. Furthermore, if the recording information including the UTOC information of the copy MD is copied to another MD, the creation of the copy MD can be repeated indefinitely.
[0019]
Such a problem can be prevented by executing copy protection management using information that cannot be copied.
[0020]
For example, a method is conceivable in which information unique to each MD, that is, disc identification information (media ID) is recorded in the TOC area of the MD using prepits. If the recorded information is encrypted by the recorded media ID and recorded, and the read data is decrypted by the media ID at the time of reproduction, the recorded information on the MD can be stored in a state where the MD is mounted on the reproducing apparatus. That is, unless the playback device can acquire the media ID, playback cannot be performed.
[0021]
However, when such a disc is played back on an existing MD device, the encrypted recorded information is played back as it is, so that undesired playback such as generation of abnormal noise is performed. The same is true for recording. If the above-mentioned disc is recorded by an existing MD device, the recording information is recorded on the disc without being encrypted by the media ID. When the information recorded in this manner is reproduced by a reproducing apparatus corresponding to the disc, a process of decrypting the read information is executed even though the information has not been encrypted. , Undesirable reproduction is performed.
[0022]
Accordingly, the present invention provides a recording medium and a recording / reproducing apparatus for preventing inconvenient recording and / or reproducing operation even with an existing apparatus, while at the same time ensuring thorough copyright protection. The task is to
[0023]
In addition, more comprehensively, when pre-recording predetermined information in a state in which it cannot be altered for other purposes as well as thorough copyright protection, inconvenient recording and / or reproducing operations may be performed by existing devices. It is an object of the present invention to provide a recording medium and a recording / reproducing apparatus for the recording medium in which the recording cannot occur.
[0024]
[Means for Solving the Problems]
In view of the above problems, the present invention has the following features.
[0025]
The invention according to claim 1 is related to a recording medium, and is provided in an area which is read by an existing recording / reproducing apparatus prior to the start of a recording or reproducing operation, in a form in which a reading error occurs in the existing recording / reproducing apparatus. Is recorded.
[0026]
According to a second aspect of the present invention, in the recording medium according to the first aspect, the predetermined information is information for identifying the recording medium, and the information is stored in an area read before the recording or reproduction is started. It is characterized in that it is recorded in a form different from the form normally recorded in this area.
[0027]
According to a third aspect of the present invention, there is provided a recording medium in which the structure of an existing mini-disc is changed, and an existing mini-disc recording / reproducing apparatus causes a reading error in an area substantially corresponding to a TOC recording area of the existing mini-disc. It is characterized in that predetermined information is recorded in a form.
[0028]
According to a fourth aspect of the present invention, in the recording medium according to the third aspect, the predetermined information is information for identifying the recording medium, and the information is generally stored in an area substantially corresponding to the TOC area. It is characterized by being recorded in a form different from the form recorded in the area.
[0029]
According to a fifth aspect of the present invention, in the recording medium according to the third or fourth aspect, the predetermined information is recorded by a width of a groove formed radially from a center of the disk and / or a width between the grooves. Features.
[0030]
According to a sixth aspect of the present invention, there is provided information for identifying the recording medium in an area which is read by the existing recording / reproducing apparatus prior to the start of the recording or reproducing operation, in a form in which the existing recording / reproducing apparatus causes a reading error. A recording / reproducing apparatus for recording or reproducing information on or from a recording medium on which is recorded, a first reading means for reading the identification information in accordance with a recording form of the identification information, and recording information by the read identification information. And recording means for recording the encrypted recording information in a recording area of the recording medium.
[0031]
According to a seventh aspect of the present invention, in the recording / reproducing apparatus according to the sixth aspect, a determination unit configured to determine whether the identification information is recorded in an area read prior to the start of the recording or reproduction operation, Second reading means for reading the area in the same manner as the existing recording / reproducing apparatus, and when the discrimination means determines that the identification information is not recorded, the area is read by the second reading means. And a switching means for performing the switching as described above.
[0032]
According to an eighth aspect of the present invention, in the recording / reproducing apparatus according to the seventh aspect, when the discrimination means determines that the identification information is not recorded, the recording is performed on the recording medium without encryption by the encryption means. It is characterized by recording information.
[0033]
According to a ninth aspect of the present invention, in the recording / reproducing apparatus according to any one of the sixth to eighth aspects,
A third reading unit for reading the recording information from the area where the recording information is recorded, and an encryption of the recording information read from the third reading unit by the identification information read by the first reading unit. Decoding means for decoding.
[0034]
According to a tenth aspect of the present invention, information for identifying the recording medium is recorded in an area read by the existing reproducing apparatus prior to the start of the reproducing operation in a form that causes a reading error in the existing reproducing apparatus. A reproducing apparatus that reproduces a recording medium on which recording information is recorded by being encrypted with the identification information, wherein the recording information reproducing means reproduces the non-encrypted recording information; Identification information reproducing means for reproducing, decoding means for decrypting the encryption of the recording information read from the recording medium by the identification information reproduced by the identification information reproducing means, and the identification information in an area read before the reproduction operation starts Discriminating means for discriminating whether or not the identification information is recorded; and when the discriminating means determines that the identification information is recorded, the decoding means determines whether or not the identification information is recorded. Then, the recording information is reproduced by the reproducing means, and if the discriminating means determines that the identification information is not recorded, the recording information read from the recording medium is reproduced by the reproducing means as it is. Switching means for switching.
[0035]
According to the invention described in the above claim, the identification information of the recording medium or other information is stored in an area that is read by the existing recording / reproducing apparatus prior to the start of the recording or reproducing operation, and a read error occurs in the existing recording / reproducing apparatus. Therefore, even if the recording medium is recorded / reproduced by an existing recording / reproducing apparatus, the disk is ejected as a disk error, for example, prior to the recording / reproducing operation. No inconvenient recording / reproduction operation is performed.
[0036]
For example, in a case where disk identification information is recorded in an area substantially corresponding to the TOC area according to the width of grooves formed radially from the center of the disk and / or the width between the grooves, In the existing MD device, this area is read as the TOC area when the MD is mounted. However, since there is no track-like pre-pit and there is a radially formed groove, it is determined that tracking adjustment is impossible. Is ejected. Therefore, an inconvenient recording / reproducing operation is not performed by the existing MD device.
[0037]
The features of the present invention will become more apparent from the following description of embodiments.
[0038]
However, the following embodiments are merely one embodiment of the present invention, and the meanings of the terms of the present invention and each component are not limited to those described in the following embodiments. Absent.
[0039]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0040]
First, FIG. 1 shows a structure of an MD disc according to the embodiment. As shown in the drawing, in the MD disc, a media ID area is arranged in the TOC area of the existing MD shown in FIG. 9, and a TOC area is arranged on the outer peripheral side. The configurations of the TOC area, UTOC area, and recordable area are the same as those of the existing MD shown in FIG.
[0041]
In the media ID area, a groove is formed radially from the center of the disk, and the media ID is recorded by the width of the groove and the width between the grooves. Each groove is formed by burning off the film structure of the TOC region with a high-power laser. The portion between the grooves has the same film structure as that of the TOC region (the portion other than the pre-pits). Each groove is formed such that the front edge and the rear edge when viewed in the circumferential direction are in the radial direction of the disk. Therefore, each groove is wider on the outer peripheral side than on the inner peripheral side.
[0042]
An MD disk having such a structure is built in an MD cartridge, like an existing MD. This MD cartridge is formed with a hole indicating that the built-in MD disc is different from the existing MD disc. Other configurations and external dimensions are the same as those of the existing MD cartridge.
[0043]
The media ID may be recorded with the width between the grooves being constant and only the width of the groove being variable. Conversely, the media ID may be recorded with the width of the groove being constant and only the width between the grooves being variable.
[0044]
FIG. 2 shows a configuration of an MD device that records and reproduces information on and from the MD (hereinafter, referred to as “copyright protected MD”) according to the above embodiment.
[0045]
This MD device differs from the existing MD device shown in FIG. 10 in the configuration of the encoder 21 and the decoder 22. Further, a media ID detection circuit 23, a hole detection circuit 24, and a controller 25 are newly added.
[0046]
If the MD mounted on the device is a copyright protected MD, the encoder 21 performs ECC encoding processing after encrypting the recording information based on the media ID of the MD. When the mounted MD is the existing MD shown in FIG. 9, only the ECC process is executed without encrypting the recording data.
[0047]
FIG. 3 shows the configuration of the encoder 21. The encoder 21 includes an ECC encoding circuit 211, selectors 212 and 214, and an encryption circuit 213.
[0048]
The encryption circuit 213 encrypts the recording data based on the media ID read from the MD disk as described later. Various known methods such as a convolution process using a media ID can be used as the encryption method. The selectors 212 and 214 selectively switch the transmission path according to the select data from the controller 25. That is, when the mounted MD is a copyright protected MD, the transmission path on the encryption circuit 213 side is selected, and when the mounted MD is an existing MD, the transmission path on the other side is selected. I do.
[0049]
Returning to FIG. 2, when the mounted MD is a copyright protected MD, the decoder 22 executes ECC decoding processing, then decrypts the data based on the media ID of the MD, and mounts the mounted MD. If the obtained MD is an existing MD, the data subjected to the ECC decoding processing is output to the reproduction circuit 12 as it is.
[0050]
FIG. 4 shows the configuration of the decoder 22. The decoder 22 includes an ECC decode circuit 221, selectors 222 and 224, and a decrypt circuit 223.
[0051]
The de-encryption circuit 223 decrypts the read data based on the media ID read from the MD disk as described later. The selectors 222 and 224 selectively switch the transmission path according to the select data from the controller 25. That is, when the mounted MD is a copyright protected MD, the transmission path on the de-encryption circuit 223 side is selected, and when the mounted MD is an existing MD, the transmission path on the other side is selected. .
[0052]
Returning to FIG. 2, the media ID detection circuit 23 reproduces the media ID data based on the media ID signal from the reproduction signal amplification circuit 8 and outputs this to the controller 25. The hole detection circuit 24 detects the medium identification hole formed in the MD cartridge by using a photocoupler or a mechanical switch or the like, and outputs a detection result to the controller 25. The controller 25 determines whether the mounted MD is the copyright protected MD shown in FIG. 1 or the existing MD shown in FIG. 9 according to the detection result from the hole detection circuit 24, The select data and the media ID data are supplied to the encoder 21 and the decoder 22 according to the determination result.
[0053]
FIG. 5 shows a configuration example of the photodetector 72 and the reproduction signal amplification circuit 8.
[0054]
The photodetector 72 includes six detection areas A, B, C, D, E, and F. Here, DR1 in the figure indicates the track direction of the disk, and DR2 indicates the tracking direction of the disk. The configuration example of FIG. 5 shows a configuration example in which a tracking error signal and a focus error signal are generated by the one-beam push-pull method and the astigmatism method. Note that the configuration of an optical system for realizing the one-beam push-pull method and the astigmatism method is conventionally well-known, and a description thereof will be omitted here.
[0055]
In the on-focus and on-track states, the reflected beam from the disc is equally divided and irradiated onto the areas A, B, C, and D of the photodetector 72 in four divided states. The regions E and F are respectively irradiated with reflected beams whose optical paths are divided into two beams having different polarization planes by a Wollaston prism (not shown) in the optical pickup 7.
[0056]
The reproduction signal amplification circuit 8 includes addition circuits 81, 83, 84, 85, 86 and subtraction circuits 82, 87, 88.
[0057]
A reproduction RF signal when scanning the recordable area (magneto-optical recording) is generated by subtracting the output signals of the areas E and F by a subtraction circuit 82. The reproduction RF signal when the TOC area (pre-pit) is scanned is generated by adding the output signals of the areas E and F by the addition circuit 81. Further, the reproduction RF signal when scanning the media ID area (radial groove) is generated by adding the output signals of the areas E and F by the adding circuit 81 as in the case of scanning the TOC area.
[0058]
The tracking error signal is obtained by subtracting a signal obtained by adding the output signals from the areas A and B by the adding circuit 83 and a signal obtained by adding the output signals from the areas C and D by the adding circuit 84 by the subtracting circuit 87. Generated by subtraction. The focus error signal is obtained by subtracting the signal obtained by adding the output signals from the areas A and D by the adder circuit 85 and the signal obtained by adding the output signals from the areas B and C by the adder circuit 86 to a subtraction circuit 88. Is generated by subtracting.
[0059]
FIG. 6 shows a flowchart of a process executed prior to the recording / reproducing operation in the MD device.
[0060]
When the MD cartridge is mounted on the MD device (S101), first, it is determined whether or not the medium identification hole is detected by the hole detection circuit 24 (S102). If it is determined that a hole has been detected, the mounted MD is recognized as a copyright protected MD, and the pickup 7 is moved to the innermost position of the disk, that is, the media ID area (S103). Then, when the focus trial is executed and the focus adjustment is performed satisfactorily (S104), the disk rotation speed is set to the speed for reading the media ID (constant angular speed) (S105), and the media ID is adjusted without performing the tracking adjustment. The reading of the area is performed. Thereby, the media ID data is reproduced by the media ID detection circuit 23 and stored in the memory in the controller 25 (S106).
[0061]
Thereafter, the pickup 7 is moved to the TOC area (S107), and the tracking adjustment is performed (S108). Then, when the tracking adjustment is properly performed, the reading and reproducing of the TOC data is executed. The reproduced TOC data is stored in the memory in the controller 25 (S109). Thereafter, when a recording or reproduction instruction is input by the user, a recording or reproduction operation is executed in accordance with the instruction (S110).
[0062]
If it is determined in S102 that no hole has been detected, the mounted MD is recognized as an existing MD, and the pickup 7 is moved to the innermost position of the disk, that is, the TOC area (S112). Then, a focus trial is performed, and when the focus adjustment is properly performed (S113), the tracking adjustment is performed (S108). Then, when the tracking adjustment is properly performed, the reading and reproducing of the TOC data is executed. The reproduced TOC data is stored in the memory in the controller 25 (S109).
[0063]
In the above, when either the focus adjustment (S104, S113) or the tracking adjustment (S108) results in an error, the MD cartridge is ejected, and the process ends (S111). After the TOC information is stored in the controller 25, the reproduction of the UTOC data is continuously performed. The reproduced UTOC data is stored in a memory in the controller 25.
[0064]
FIG. 7 shows a processing flowchart during the reproduction operation.
[0065]
When a reproduction command of a predetermined music is input, the pickup 7 is moved to a start position of the music and a reading operation is started (S201). By this reading operation, a reproduction RF signal is output from the reproduction signal amplification circuit 8 and supplied to the decoding circuit 10 via the waveform shaping circuit 9. The decoding circuit 10 sequentially decodes the received RF signals to generate and output read data (S202).
[0066]
In the process of FIG. 6, when it is determined that the MD mounted on the MD device is the copyright protection MD (YES in S203), the decoder 22 performs the de-encryption process on the data read from the decoding circuit 10. (Decryption processing) is executed (S204), and ECC decoding processing is performed on the de-encrypted data to supply the data to the reproduction circuit 12 (S205). The reproduction circuit 12 performs a process such as DA conversion on the received reproduction data, and supplies this to a speaker. As a result, the music specified by the user is output from the speaker.
[0067]
On the other hand, if it is determined in the processing of FIG. 6 that the MD mounted on the MD device is an existing MD (NO in S203), the decoder 22 performs ECC on the read data from the decoding circuit 10. Only the decoding process is executed and supplied to the reproduction circuit 12 (S205). As a result, the music of the existing MD recorded in an unencrypted state is reproduced and output.
[0068]
Such a reproducing operation is executed until the reproduction of the music designated by the user is completed (S206). When the reproduction of the designated music is completed, the MD device is set in the standby mode until the next reproduction command or recording command or the MD is ejected.
[0069]
FIG. 8 shows a processing flowchart during the recording operation.
[0070]
When a recording command is input to the MD device, the UTOC data stored in the controller 25 is referred to, and the start address of a free area is obtained. Then, the pickup 7 is moved to the position of the head address (S301), and the recording data writing process is sequentially performed.
[0071]
In the process of FIG. 6, when it is determined that the MD mounted on the MD device is the copyright protection MD (YES in S302), the encoder 21 performs the ECC encoding process on the recording data, Further, an encryption process (encryption process) is executed (S303), and this is supplied to the modulation circuit 2. The modulation circuit 2 performs a modulation process on the received recording data (S304), and supplies this to the drive signal generation circuit 3. As a result, the recording data is sequentially recorded in an empty area of the MD disc in an encrypted state (S305).
[0072]
On the other hand, in the process of FIG. 6, when it is determined that the MD mounted on the MD device is not the copyright protection MD (NO in S302), the encoder 21 executes only the ECC encoding process on the recording data. Then, this is supplied to the modulation circuit 2 (S307). The modulation circuit 2 performs a modulation process on the received recording data (S304), and supplies this to the drive signal generation circuit 3. As a result, the recording data is sequentially recorded in an empty area of the MD disc without being encrypted (S305).
[0073]
This recording operation is performed until the recording data ends (S306). When the reproduction of the designated music is completed, the MD device is set to the standby mode until the next recording command or reproduction command or the MD is ejected.
[0074]
Next, an operation when the copyright protection MD is mounted on the existing MD device shown in FIG. 10 will be described with reference to FIG.
[0075]
When the copyright protection MD is mounted on the MD device (S401), the pickup 7 is moved to the innermost position, that is, the media ID area (S402). Thereafter, the focus trial (S403) and the tracking adjustment (S404) are performed.
[0076]
As described above, since the media ID area of the copyright protected MD has the same film structure as the TOC area of the existing MD, the determination of the focus trial in S403 is usually determined to be good. However, since no track-shaped pre-pits are formed in the media ID area, and instead, radial grooves are formed, tracking is not performed, and therefore, the determination of tracking adjustment in S404 is always an error. Is determined. As a result, the copyright protected MD is ejected from the MD device before shifting to the recording / reproducing operation. Therefore, no inconvenient recording / reproduction is performed on the MD.
[0077]
As described above, according to the copyright-protected MD and MD apparatus according to the present embodiment, the media ID unique to the MD disc is recorded in advance in the form of a groove, and the recorded data is encrypted using the media ID. Even if the recorded data is copied to another MD together with the UTOC data, the recorded data cannot be decrypted after being copied. Therefore, compared to the limitation by the conventional SCMS, Digital copy prohibition can be more thoroughly enforced.
[0078]
Further, by setting the recording position of the media ID to a TOC area which is read by an existing MD device prior to the recording / reproducing operation, when the copyright protection MD according to the embodiment is mounted on the existing MD, The MD is always ejected in the TOC reading operation before the recording / reproducing operation, so that it is possible to prevent the copyright protected MD from being inadvertently recorded / reproduced by the existing MD device. .
[0079]
As described above, according to the above-described embodiment, thorough copyright protection and inconvenience with existing MD devices can be solved at the same time.
[0080]
Note that the present invention is not limited to the above embodiment, and it goes without saying that various other changes are possible.
[0081]
For example, in the above embodiment, a radial groove is formed in the media ID area, and the medium ID is recorded by this. However, the media ID may be recorded in other forms. As an example, the reflectivity of the media ID area may be set lower than the reflectivity of the TOC area of the existing MD, and the medium ID may be recorded in the pre-pits here. With this configuration, the existing MD device cannot reproduce the media ID area due to insufficient reflected light intensity, and as a result, the MD is ejected. In an MD device for reading a media ID from such an MD, it is necessary to adjust the gain when reading the media ID area and generate a reproduced RF signal with sufficient strength.
[0082]
Further, the data to be recorded in the media ID area may be not only the media ID but also other data. Although the above-described embodiment has been made with copyright protection in mind, in the case of configuring the embodiment for purposes other than copyright protection, the area corresponding to the above-mentioned media ID area contains a medium other than the media ID. May be recorded. In such a case, if the information is recorded in the radial groove as described above, the MD is ejected before the recording / reproducing operation is performed in the existing MD device. It is possible to avoid performing appropriate recording / reproduction.
[0083]
In addition, in the above embodiment, the MD has been described as an example. However, the present invention is not limited to the MD, and can be applied to other recording media such as a DVD and a CD-R. Further, the data to be recorded is not limited to audio data, but may be other data such as a video, a still image, or the like.
[0084]
Various changes can be made to the embodiments of the present invention as appropriate within the scope of the technical idea of the present invention.
[0085]
【The invention's effect】
According to the present invention, in the area read by the existing recording / reproducing apparatus prior to the start of the recording or reproducing operation, the existing recording / reproducing apparatus records predetermined information in a form that causes a reading error. While realizing special control for copyright protection etc. by adding the predetermined information, an inconvenient recording / reproduction operation by the existing device due to the addition of the information is performed during a reading operation prior to the recording / reproduction operation. Can be avoided by the ejecting process described above.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an MD disc according to an embodiment.
FIG. 2 is a diagram showing a configuration of an MD device according to an embodiment.
FIG. 3 is a diagram showing a configuration of an encoder according to the embodiment;
FIG. 4 is a diagram showing a configuration of a decoder according to an embodiment.
FIG. 5 is a diagram illustrating a configuration of a photodetector and a reproduction signal amplifier circuit according to the embodiment.
FIG. 6 is a flowchart showing processing before a recording / reproducing operation according to the embodiment;
FIG. 7 is a flowchart showing a reproducing operation according to the embodiment;
FIG. 8 is a flowchart illustrating a recording operation according to the embodiment;
FIG. 9 is a diagram showing a configuration of an existing MD disc.
FIG. 10 is a diagram showing a configuration of an existing MD device.
FIG. 11 is a processing flowchart before a recording / reproducing operation in an existing MD device.
[Explanation of symbols]
2 Modulation circuit
3 Drive signal generation circuit
4 Magnetic head drive circuit
5 Magnetic head
6. Laser drive circuit
7 Pickup
8 Reproduction signal amplification circuit
9 Waveform shaping circuit
10 Decoding circuit
12 Regeneration circuit
21 Encoder
22 Decoder
23 Media ID detection circuit
24 Hall detection circuit
25 Controller

Claims (10)

A recording medium wherein predetermined information is recorded in an area which is read by an existing recording / reproducing apparatus prior to the start of a recording or reproducing operation, in such a manner that a reading error occurs in the existing recording / reproducing apparatus. In claim 1,
The predetermined information is information for identifying the recording medium, and this information is recorded in an area that is read before the recording or reproduction is started, in a form different from a form normally recorded in this area. A recording medium characterized in that: In a recording medium in which the structure of the existing mini-disc has been changed, predetermined information is written in an area substantially corresponding to the TOC recording area of the existing mini-disc in a form that a reading error occurs in the existing mini-disc recording / reproducing apparatus. A recording medium characterized by being recorded. In claim 3,
The predetermined information is information for identifying the recording medium, and the information is recorded in an area substantially corresponding to the TOC area in a form different from a form normally recorded in this area. A recording medium characterized by the above-mentioned. In claim 3 or 4,
The predetermined information is recorded by a width of a groove formed radially from a center of the disk and / or a width between the grooves. A recording medium in which information for identifying the recording medium is recorded in an area that is read by an existing recording / reproducing apparatus prior to the start of recording or reproducing operation, in a form that causes a reading error in the existing recording / reproducing apparatus. A recording and reproducing device for recording or reproducing information,
First reading means for reading the identification information according to a recording form of the identification information;
Encryption means for encrypting the recorded information with the read identification information;
Recording means for recording the encrypted recording information in a recording area of the recording medium,
A recording / reproducing apparatus comprising: In claim 6,
Determining means for determining whether or not the identification information has been recorded in an area read prior to the start of the recording or reproducing operation;
Second reading means for reading the area in the same manner as the existing recording / reproducing device;
A switching unit that switches the area to be read by the second reading unit when the determination unit determines that the identification information is not recorded;
A recording / reproducing apparatus further comprising: In claim 7,
If it is determined that the identification information is not recorded by the determination unit, the recording information is recorded on a recording medium without encryption by the encryption unit,
A recording / reproducing apparatus characterized by the above-mentioned. In any one of claims 6 to 8,
Third reading means for reading recording information from an area where the recording information is recorded;
Decryption means for decrypting the recording information read from the third reading means with the identification information read by the first reading means;
A recording / reproducing apparatus further comprising: Information for identifying the recording medium is recorded in an area that is read by the existing playback device prior to the start of the playback operation, in a form that causes a read error in the existing playback device, and the identification information is included in the identification information. A reproducing apparatus for reproducing a recording medium on which recording information is recorded in an encrypted form,
Recording information reproducing means for reproducing non-encrypted recording information;
Identification information reproducing means for reproducing the identification information;
Decryption means for decrypting the encryption of the record information read from the recording medium by the identification information reproduced by the identification information reproduction means,
Determining means for determining whether or not the identification information is recorded in an area read before the start of the reproducing operation;
When it is determined that the identification information is recorded by the determination means, the decryption means decrypts the encryption, and then the playback information is played back by the playback means, and the identification information is not recorded by the determination means. Switching means for switching the recording information read from the recording medium as it is determined to be reproduced by the reproducing means,
A playback device comprising:

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