Source: http://www.google.com/patents/US8184954?dq=7,007,239
Timestamp: 2018-01-17 03:34:51
Document Index: 734051027

Matched Legal Cases: ['art 1', 'art 1', 'art 1', 'art 2', 'art 3', 'Application No. 07729491', 'Application No. 08165514']

Patent US8184954 - Information recording medium in which one land pre-pit is formed in each ... - Google Patents
An optical disc (100) is provided with a recording region where prescribed clock information (WBL) is preformatted for recording. The clock information is (i) included in a first frequency band that is definable by a first reference frequency (Fstd) (that is impossible for a conventional reproducing...http://www.google.com/patents/US8184954?utm_source=gb-gplus-sharePatent US8184954 - Information recording medium in which one land pre-pit is formed in each group unit of wobbles formed by each “N” cycles of wobbles
Publication number US8184954 B2
Application number US 12/235,201
Also published as CN101405806A, CN101405806B, CN101494071A, CN101510434A, EP2001024A2, EP2001024A4, EP2001024A9, EP2009636A2, EP2009636A3, EP2009636B1, EP2012320A2, EP2012320A3, EP2012320B1, EP2287845A2, EP2287845A3, EP2287845B1, US20090087170, US20090317058, WO2007111259A1
Publication number 12235201, 235201, US 8184954 B2, US 8184954B2, US-B2-8184954, US8184954 B2, US8184954B2
Inventors Akira Shimizu, Masayoshi Yoshida, Tsuyoshi Hasebe, Masahiro Kato, Eisaku Kawano, Shoji Taniguchi, Eiji Muramatsu
Patent Citations (20), Non-Patent Citations (4), Classifications (30), Legal Events (2)
Information recording medium in which one land pre-pit is formed in each group unit of wobbles formed by each “N” cycles of wobbles
US 8184954 B2
An optical disc (100) is provided with a recording region where prescribed clock information (WBL) is preformatted for recording. The clock information is (i) included in a first frequency band that is definable by a first reference frequency (Fstd) (that is impossible for a conventional reproducing device to detect by a detecting method based on a self-correlation) and is (ii) defined by a frequency that is integer times the first frequency.
one sync frame is formed by the “8 times N” pieces of pre-formatted wobbles included in the groove track (wherein “N” is an even number; “N” is equal to a ratio of (i) the frequency at which the groove track wobbles to (ii) 140 kHz,
The present invention relates to an information recording medium, such as an optical disc, on which recording and reproduction can be performed by irradiating it with laser light, such as a DVD (Digital Versatile Disc), a BD (Blu-ray Disc), and a CD (Compact Disc), a recording apparatus and method and a reproducing apparatus and method for the information recording medium, and a computer program.
The conventional recording-type information recording medium (recording-type media) is designed as follows. That is, in the recording-type information recording medium, firstly, contents such as movie contents which allow free copy that does not need copyright protection, so-called copy-free contents are recorded on the basis of e.g. a DVD-Video format, and a finalize process can be performed. In addition, on the recording-type information recording medium on which the finalize process has been performed, reproduction can be performed while retaining reproduction compatibility by a conventional reproducing apparatus, such as a DVD player.
On the other hand, in the DVD-Video format, the copyright protection is realized by an encryption system, such as a CSS (Content Scramble System). Specifically, if the contents whose copyright is protected by the CSS are recorded onto the recording-type information recording medium, the reproduction of the contents is not allowed by a reproduction restriction system for protecting the copyright of the contents held by the reproducing apparatus, and the reproduction of the contents is prohibited without exception. In other words, in general, the conventional reproducing apparatus recognizes that the contents whose copyright is protected by the CSS are basically recorded in advance only on a read-only information recording medium, such as a DVD-ROM. Thus, the conventional reproducing apparatus judges that the contents are illegally copied in violation of the DVD-Video format if the contents whose copyright is protected by the CSS are recorded on the recording-type information recording medium. Then, the reproduction of the contents is not allowed by the reproduction restriction system, and the reproduction of the contents is prohibited without exception. In addition, the judgment of whether or not to be the recording-type information recording medium is based on whether or not a signal is detected from wobble (hereinafter referred to as a “wobble signal” as occasion demands) unique to the recording-type information recording medium.
Patent document 1: Japanese Patent Application Laid Open NO. 2004-55079
Patent document 2: Japanese Patent Application Laid Open NO. 2001-307427
Patent document 3: Japanese Patent Application Laid Open NO. 2001-357001
Patent document 4: Japanese Patent Application Laid Open NO. 2000-311346
Non-patent document 1: “Protection of Contents on DVD”, Toshiba Review, Vol. 58, No 6 (2003).
However, under the encryption system about the copyright protection, such as a CSS, described above, if a content supplier (content holder) that owns the copyright uses the recording-type information recording medium and tries to supply a general user with the contents whose copyright is protected through a legal procedure about the copyright protection, the following technical problem will occur. That is, there is such a technical problem that regardless of the contents recorded on the recording-type information recording medium through the legal procedure about the copyright protection, a general user is not allowed to reproduce the contents by the reproduction restriction system held by the conventional reproducing apparatus (or general information recording/reproducing apparatus), and the reproduction of the contents is prohibited without exception.
According to the information recording medium of the present invention, in the recording area provided for the information recording medium, (i) the predetermined clock information included in the first frequency band which can be defined by the first reference frequency (Fstd: DVD-R/RW) is pre-formatted. Here, the “first reference frequency” of the present invention is a frequency which is a reference, such as a frequency of clock information (wobble) pre-formatted on the conventional recording-type optical disc, such as a DVD-R and a DVD-RW. Moreover, the “first frequency band” of the present invention means a frequency band that is not detected as the first reference frequency by the conventional reproducing apparatus for judging whether or not the frequency of the clock information can be detected (or identified) as the first reference frequency (Fstd) on the basis of the self-correlation (or autocorrelation) described later. In particular, the first frequency band may be one continuous frequency band, or may be a plurality of discrete frequency bands.
As a result, the frequency of the predetermined clock information (wobble) is an integral multiple of the first reference frequency (Fstd: DVD-R/RW). Thus, it is possible to pre-format address information (hereinafter referred to as “predetermined address information” as occasion demands), which cannot be detected by the conventional reproducing apparatus that can detect the address information (hereinafter referred to as “first address information” as occasion demands), such as LPP (Land Pre-Pit), pre-formatted with the first reference frequency and which can hold a simple and proper phase relationship with the predetermined clock information.
In one aspect of the information recording medium of the present invention, the predetermined clock information is defined by a first frequency (2n×Fstd) which is 2n times (wherein “n” is an integer number) the first reference frequency.
According to this aspect, the predetermined clock information (wobble) is defined by the first frequency (2n×Fstd) which is 2n times (wherein “n” is an integer number) the first reference frequency. Therefore, the conventional reproducing apparatus for judging whether or not the frequency of the clock information can be detected (or identified) as the first reference frequency on the basis of the self-correlation hardly detects or does not detect the predetermined clock information at all. Here, the “self-correlation” of the present invention is a correlation between one variable indicating a signal feature and another variable indicating the signal feature, defined to make the signal feature, such as a frequency, amplitude, and phase, inductively quantitative or qualitative, in various signal, such as a wobble signal.
In an aspect associated with the predetermined clock information, the predetermined clock information may be defined by a predetermined range of frequency centered on the first frequency (2n×Fstd±α).
By virtue of such construction, it is possible to realize the retention of reproduction compatibility, more accurately, on the basis of the predetermined range of frequency centered on the first frequency (2n×Fstd±α).
According to this aspect, in the recording area provided for the information recording medium of the present invention, (i) the predetermined clock information (wobble) also included in the second frequency band which can be defined by the second reference frequency (Fwb2: DVD+R/RW) is pre-formatted. Here, the “second reference frequency” of the present invention is a frequency which is a reference, such as a frequency of clock information (wobble) pre-formatted on the conventional recording-type optical disc, such as a DVD+R and a DVD+RW. Moreover, the “second frequency band” of the present invention means a frequency band that is not detected as the second reference frequency by the conventional reproducing apparatus for judging whether or not the frequency of the clock information can be detected (or identified) as the second reference frequency.
As a result, for example, the reproduction setting area is included in the recording area, wherein the reproduction setting area is firstly accessed in reproducing the record data and it is to identify whether or not to be the recording media in order to judge whether or not to allow the reproduction of the record data. Therefore, since the predetermined clock information that cannot be detected by the general information recording/reproducing apparatus (hereinafter referred to as a “second information recording/reproducing apparatus” as occasion demands) for performing the recording or reproduction process on the basis of the second reference frequency is pre-formatted in the reproduction setting area, the second information recording/reproducing apparatus cannot distinguish between the information recording medium of the present invention and a general read-only information recording medium, such as a DVD-ROM, in a reproduction process in the recording area. As a result, the second information recording/reproducing apparatus can perform the reproduction process on the information recording medium of the present invention, as in the general read-only information recording medium.
As a result, the frequency of the predetermined clock information is an integral multiple of the second reference frequency. Thus, for example, it is possible to pre-format the predetermined address information, which cannot be detected by the conventional reproducing apparatus that can detect the address information (hereinafter referred to as “second address information” as occasion demands), such as LPP, pre-formatted with the second reference frequency and which can hold a simple and proper phase relations hip with the predetermined clock information.
In an aspect associated with the predetermined clock information, the predetermined clock information may be defined by a second frequency (2m×Fwb2) which is 2m times (wherein “m” is an integer number) the second reference frequency.
By virtue of such construction, the predetermined clock information (wobble) is defined by the second frequency (2m×Fwb2) which is 2m times (wherein m is a natural number) the second reference frequency. Therefore, the second information recording/reproducing apparatus for judging whether or not the frequency of the clock information can be detected (or identified) as the second reference frequency on the basis of the self-correlation hardly detects or does not detect the predetermined clock information at all.
Moreover, in this aspect associated with the predetermined clock information, the predetermined clock information may be defined by a predetermined range of frequency centered on the second frequency (2m×Fwb2±β).
By virtue of such construction, it is possible to realize the retention of reproduction compatibility, more accurately, on the basis of the predetermined range of frequency centered on the second frequency (2m×Fwb2±β).
According to this aspect, in the recording area, the predetermined address information (LPP) is pre-formatted on the basis of the first reference frequency. Here, the “predetermined address information” of the present invention is address information which cannot be detected by the conventional reproducing apparatus that can detect the first address information, such as LPP (Land Pre-Pit), pre-formatted with the first reference frequency and which can hold a simple and proper phase relationship with the predetermined clock information.
According to the information recording apparatus of the present invention, the signal processing conditions are set by the setting device on the basis of the predetermined clock information. Here, the “signal processing conditions” of the present invention are various processing conditions for performing the signal processing in the recording or reproduction corresponding to the predetermined clock information, such as performing the division process on the predetermined clock information.
FIG. 1 is a substantial plan view showing the basic structure of an optical disc with a plurality of recording areas, which is an information recording medium in an embodiment of the present invention, and a conceptual view showing a recording area structure in its radial direction, corresponding to the substantial plan view.
1 . . . center hole, 10 . . . track, 11 . . . ECC block, 100 . . . optical disc, 101 . . . lead-in area, 102 . . . data area, 103 . . . lead-out area, 200 . . . information recording/reproducing apparatus, CDZ . . . control data zone, RMA . . . recording management area, LB . . . laser light, WBL . . . wobble (one example of predetermined clock information), LPP . . . land pre-pit (one example of predetermined address information)
Next, with reference to FIG. 3, a relationship between the recording area on the optical disc and an address that can specify a position in the recording area will be explained. FIG. 3 is a conceptual graph showing the relationship between the recording area on the optical disc in the embodiment of the information recording medium of the present invention and the address that can specify a position in the recording area. Incidentally, the vertical axis in FIG. 3 indicates the value of the address, such as a sector number and a land pre-pit address, and the horizontal axis indicates a relative position in the radial direction of the optical disc. Moreover, one specific example of the “address” of the present invention is constructed, for example, of LBN (Logical Block Number), a physical sector number (or sector number) which constitutes an ECC block, or a land pre pit address.
As shown in FIG. 4, in the recording area of the optical disc in the embodiment, wobbles “WBL” (i.e. one specific example of the “predetermined clock information” of the present invention) defined by a frequency “Fwbl” which is twice the first reference frequency, are pre-formatted. The “first reference frequency” of the present invention is a frequency which is a reference, such as a frequency of the clock information (e.g., wobble) preformatted on the conventional recording-type optical disc, such as a DVD-R or a DVD-RW. Specifically, as shown in FIG. 5( b), in the optical disc in the comparison example, eight wobbles “WBLstd” are formed in one sync frame on the basis of the first reference frequency “Fstd”. In other words, one Even sync frame is constituted by WBLstd “1” to WBLstd “8”, and one Odd sync frame is constituted by WBLstd “9” to WBLstd “16”. In addition, address information “LPPstd” (i.e. one specific example of the “first address information” of the present invention), such as LPP (Land Pre-Pit), pre-formatted with the first reference frequency, is formed at the three peaks from the first peak in each one sync frame, i.e. substantially in each eight wobbles.
In contrast, in the optical disc in the embodiment, as shown in FIG. 4 and FIG. 5( a), 16 wobbles “WBL” are formed in one sync frame. In other words, one Even sync frame is constituted by WBL “1” to WBL “16”, and one Odd sync frame is formed of WBL “17” to WBL “32”.
In addition, there are only three land pre-pits (i.e. one specific example of the “predetermined address information” of the present invention) (hereinafter referred to as “LPP” as occasion demands) formed in each one sync frame, i.e. substantially in each 16 pieces of wobbles (or 16 wobbles). The three LPPs are formed in the six wobbles from the first wobble. In other words, the three LPPs are formed by a unit of a group (or pair) of two wobbles, at the first wobbles of the units, respectively. That is, a cycle “Tstd” in which the LPPs are formed shown in FIG. 5( a), is equal to a cycle “Tstd” in which the address information “LPPstd”s are formed shown in FIG. 5( b). Therefore, in the optical disc in the embodiment, by using the predetermined address information, it is possible to constitute the address information at the conventional formation frequency (i.e. area resolution) based on the first reference frequency. Moreover, the predetermined address information may be not constituted by the LPPs but constituted by modulating the wobble (i.e., predetermined clock information) on the basis of a frequency, phase, or amplitude, for example. Moreover, the LPP is constructed to include the address information and a timing signal for synchronizing the data recording and reproduction. More specifically, among the three LPPs, at least one LPP has the clock information for synchronization, recorded therein. The other LPPs has the address information and information for controlling the data recording or the like, recorded therein.
As a result, the frequency of the wobbles “WBL” (one example of the predetermined clock information) is twice (i.e., an integral multiple of) the first reference frequency (Fstd: reference frequency for DVD-R/RW). Thus, it is possible to pre-format the predetermined address information “LPP”, (i) which cannot be detected by the conventional reproducing apparatus that can detect the address information “LPPstd” (i.e. one specific example of the “first address information” of the present invention), such as LPP (Land Pre-Pit), pre-formatted with the first reference frequency and (ii) which can hold a simple and proper phase relationship with the predetermined clock information.
If the frequency of the wobbles “WBL” (one example of the predetermined clock information) is not an integral multiple of the first reference frequency, the specification (or definition) of the phase relationship between (i) the wobble “WBL” (one example of the predetermined clock information) and (ii) the predetermined address information “LPP” will have complexity in a process of detecting a push-pull signal in the reproduction by the conventional reproducing apparatus. And the process of detecting the predetermined address information “LPP” will possibly become technically difficult.
In contrast, the frequency of the wobbles “WBL” (one example of the predetermined clock information) in the embodiment is twice (i.e., an integral multiple of) the first reference frequency (Fstd: reference frequency for DVD-R/RW). Thus, it is possible to pre-format the wobbles “WBL” by pre-formatting the predetermined address information near a position corresponding to the peak of the wobble (i.e. a position at which the wobble has the maximum amplitude), pre-formatted on the conventional recording-type optical disc, such as the wobble of a DVD-R or a DVD-RW. As a result, it is possible to pre-format the wobbles “WBL” which can hold a simple and proper phase relationship with the predetermined clock information.
In addition, the frequency of the wobbles “WBL” (one example of the predetermined clock information) in the embodiment is twice (i.e., an integral multiple of) the first reference frequency (Fstd: reference frequency for DVD-R/RW). Thus, even by the conventional reproducing apparatus that performs reproduction on the conventional recording-type optical disc, such as the wobble of a DVD-R, on which the first address information can be detected, signal processing may be performed on the predetermined address information, substantially as in the frame structure and signal structure of the first address information. Therefore, it is possible to almost or completely eliminate a need to change the structure or the process procedure in the signal processing system (or signal processing circuit) of the address information on the conventional reproducing apparatus.
Moreover, in addition, in the recording area provided for the information recording medium, the wobbles “WBL” (one example of the predetermined clock information) or the predetermined address information “LPP” described above are pre-formatted at all positions. Therefore, in recording the record data, it is possible to record the record data at any position on the basis of one type of signal processing, for example, so that additional recording or rewriting may be performed highly accurately, as compared to the recording based on a plurality types of signal processing.
As shown in FIG. 6, the frequency of the wobbles “WBL” (one example of the predetermined clock information) described above (i.e. the frequency “Fwbl” that is twice the first reference frequency) is included in a first frequency band which can be defined by the first reference frequency “Fstd”. Here, the “first frequency band” in the embodiment means a frequency band that is not detected as the first reference frequency by the conventional reproducing apparatus for judging whether or not the frequency of the clock information can be detected (or identified) as the first reference frequency (Fstd) on the basis of the self-correlation. Moreover, the “self-correlation” in the embodiment, is a correlation between one variable indicating a signal feature and another variable indicating the signal feature, defined to make the signal feature, such as a frequency, amplitude, or phase, inductively quantitative or qualitative, in various signal, such as a wobble signal.
{(2n)×Fstd−α}<(first frequency band)<{(2n)×Fstd+α} (1)
wherein, “n” is an integer number, and α is a predetermined bandwidth that cannot be detected on the basis of the resolution of the signal processing.
More specifically, the counter value, which means the extent of the self-correlation, is quantified by a logical block shown in FIG. 7( a). That is, if it is judged on the basis of the self-correlation whether or not the frequency of the clock information, such as a wobble signal, can be detected (or identified) as the first reference frequency (Fstd), at first step (or firstly), the clock information, such as a wobble signal, is binarized. At second step (or Secondly), the binarized clock information is inputted to a logical block “XOR” for calculating exclusive OR value (refer to a signal “a” in FIG. 7( a)). Simultaneously with or in tandem with this second step, at third step (or thirdly), the binarized clock information is inputted to a logical block “Delay” for delay by half of a reference cycle (Tstd) corresponding to the first reference frequency (Fstd). At forth step (or Fourthly), in the logical block “XOR” for calculating exclusive OR value, the exclusive OR value of (i) the binarized clock information (refer to the signal “a” in FIG. 7( a)) and (ii) the clock information (refer to a signal “b” in FIG. 7( a)) which is binarized and which is delayed by half of the reference cycle (Tstd) is calculated. At fifth step (or Fifthly), the calculated value of the exclusive OR (refer to a signal “c” in FIG. 7( a)) is inputted to a counter for performing integration.
For example, as one example, as shown in FIG. 7( b), if the “signal a” (i.e. “1”, “1”, “1”, “0”, “0”, “0”), which is the binarized clock information and whose cycle is the reference cycle (Tstd) corresponding to the first reference frequency (Fstd), is inputted to the logical block shown in FIG. 7( a), the “signal a” and the “signal b” (i.e. “1”, “1”, “0”, “0”, “0”) which is obtained by delaying the “signal a” by half of the reference cycle (Tstd), are inputted to the logical block “XOR”. Then, in the logical block “XOR”, the exclusive OR value of (i) a value (i.e. “0”, “0”, “0”) corresponding to a latter half cycle of the “signal a” and (ii) a value (i.e. “1”, “1”, “1”) corresponding to a former half cycle of the “signal b” is calculated. And the “signal c” (i.e. “1”, “1”, “1”) is inputted to the counter for performing integration. Therefore, using the counter, the calculated value of integration, i.e. a counter value “3 (=1+1+1)” is obtained. As described above, by using (i) the first reference frequency (Fstd), which is the frequency of the binarized clock information described above, and (ii) the counter value “3” described above (i.e. one example of the maximum value “Max” in FIG. 6), it is possible to plot a point “P1” shown in FIG. 6.
In contrast to this, as shown in FIG. 8, if the “signal a” (i.e. “1”, “1”, “1”, “0”, “0”, “0”), which is the binarized clock information and whose cycle is a cycle (Tstd/2) corresponding to the frequency “Fwbl” that is twice the first reference frequency (Fstd), is inputted to the logical block shown in FIG. 7( a), the “signal a” and the “signal b” (i.e. “1”, “1”, “1”, “0”, “0”, “0”) which is obtained by delaying the “signal a” by half of the reference cycle (Tstd), are inputted to the logical block “XOR”. Then, in the logical block “XOR”, the exclusive OR value of (i) a value (i.e. “1”, “1”, “1”) corresponding to a former half cycle of a next cycle of the “signal a” and (ii) a value (i.e. “1”, “1”, “1” corresponding to a former half cycle of the “signal b” is calculated. And the “signal c” (i.e. “0”, “0”, “0”) is inputted to the counter for performing integration. Therefore, using the counter, the calculated value of integration, i.e. a counter value “0 (=0+0+0)” is obtained. As described above, by using (i) the frequency (Fwbl) that is twice the first reference frequency, which is the frequency of the binarized clock information described above, and (ii) the counter value “0” described above (i.e. one example of the counter value “0” in FIG. 6), it is possible to plot a point “P2” shown in FIG. 6.
As described above, the frequency of the wobbles “WBL” (one example of the predetermined clock information) described above, i.e. the frequency “Fwbl” that is twice the first reference frequency (Fstd: frequency for DVD-R/RW), is included in the first frequency band, which is a frequency hand that is not detected as the first reference frequency by the conventional reproducing apparatus for judging whether or not the frequency of the clock information can be detected (or identified) as the first reference frequency (Fstd) on the basis of the self-correlation.
Consequently, it is possible to supply the contents whose copyright is protected by the encryption system, such as a CSS, to a general user using the recording-type information recording medium on which the wobbles “WBL” (one example of the predetermined clock information) described above are pre-formatted. And it is possible to enable the conventional reproducing apparatus to perform the reproduction process on the supplied contents, appropriately and easily. Therefore, according to the optical disc in the embodiment, it is possible to realize both the copyright protection of the contents and the retention of reproduction compatibility.
As shown in FIG. 9, an information recording/reproducing apparatus 200 is provided with: an optical pickup 202 for emitting a reproduction beam to the optical disc 100 and outputting a signal corresponding to reflected light; a spindle motor 203 for controlling the rotation of the optical disc 100; and a servo unit 222. The servo unit 222 is supplied with a first clock signal CK1 and a pit synchronization signal SYNCp. In synchronization with these signals, the servo unit 222 performs tracking servo and focus servo for relative position control of the optical pickup 202 for the optical disc 100, and spindle servo for controlling the rotation of the spindle motor 203. Incidentally, for example, on the optical disc 100, pit data DP synchronized with the first clock signal CK1 is recorded by the length of a record mark. The record mark in this example is a pit, and the track is formed of a pit row. The track has a meandering shape according to a wobble signal WB, which is obtained by modulating wobble data DW. The wobble signal WB is synchronized with a second clock signal CK2. The first clock signal CK1 has an N-fold frequency (“N” is an integer number) of that of the second clock signal CK2. In this example, N=25, the second clock signal CK2 is 420 KHz, and the first clock signal CK1 is 10.5 MHz.
A division frequency circuit (or a frequency dividing circuit) 226 changes the frequency of the wobble signal “1/N (wherein “N” is an integer number)”-fold. Therefore, by changing the frequency of the aforementioned wobbles “WBL” pre-formatted on the optical disc in the embodiment, ½-fold, it is possible to make the signal processing through the division frequency circuit 226 substantially equivalent to the conventional signal processing in the first reference frequency.
Then, under the control of the CPU 250, it is judged whether or not to reproduce the record data, such as contents, recorded on the optical disc (step S104). If the record data, such as contents, is to be reproduced (the step S104: ‘Yes), moreover it is judged whether or not to reproduce the record data, such as contents, on the basis of the encryption system, such as a CSS, under the control of the CPU 250 (step S105). Here, for example, if the record data, such as contents, is to be reproduced on the basis of the encryption system, such as a CSS (the step S105: ‘Yes), moreover, it is judged whether or not the wobble signal is detected, i.e. whether or not the frequency of the clock information, such as the wobble signal, described above can be detected (or identified) as the first reference frequency (Fstd) on the basis of the self-correlation, under the control of the CPU 250 (step S106). If the wobble signal is not detected, i.e. if the frequency of the clock information, such as the wobble signal, described above cannot be detected (or identified) as the first reference frequency (Fstd) (the step S106: No), the reproduction of the record data, such as contents, is allowed and the record data is reproduced under the control of the CPU 250 (step S107). Specifically, even if the contents whose copyright is protected by the CSS are recorded on the optical disc, it is considered to have the same conventional DVD-Video standard. Thus, in substantially the same manner as the conventional DVD-Video standard, it is possible to reproduce the contents while obtaining an encryption or decryption key and cancelling the copyright protection (i.e. De-CSS) in accordance with a reproduction instruction.
Then, under the control of the CPU 250, it is judged whether or not to be the optical disc on which the wobbles “WBL” (i.e. the predetermined clock information) described above are pre-formatted, on the basis of the management information, such as version information about the optical disc, on the basis of the management information that can be obtained from the LPP formed in the CDZ, RMA, or a lead-in area, for example (step S204). Here, if it is judged to be the optical disc on which the wobbles “WBL” (i.e. the predetermined clock information) described above are pre-formatted (the step S204: Yes), for example, various signal processing conditions corresponding to the wobbles “WBL” (i.e. the predetermined clock information) described above are set (step S205). As described above, on the optical disc in the embodiment, the predetermined clock information is formed using the frequency that is twice, i.e., an integral multiple of the first reference frequency. Thus, by adding the process of dividing, i.e. the process of increasing the frequency “½”-fold while matching with the phase of the LPP described above, the signal processing can be performed in almost or completely the same manner as the conventional manner, with regard to the conventional LPP signal processing conditions (signal processing system) and the wobble signal processing conditions.
On the other hand, as a result of the judgment in the step S204 described above, if it is judged not to be the optical disc on which the wobbles “WBL” (i.e. the predetermined clock information) described above are pre-formatted, i.e. if it is judged to be the conventional general optical disc (the step S204: NO), for example, the various signal processing conditions corresponding to the wobble corresponding to the first reference frequency (Fstd) are set (step S206).
On the other hand, as a result of the judgment in the step S214 described above, if the information recording medium is not to be ejected (the step S214: No), as described above, it is judged whether or not to be the optical disc on which the wobbles “WBL” (i.e. the predetermined clock information) described above are pre-formatted, on the basis of the management information, such as version information about the optical disc, on the basis of the management information, under the control of the CPU 250 (step S204).
(3-1) Optical Disc in Another Embodiment—Part 1—
As shown in FIG. 12 and FIG. 13( a), in the recording area of the optical disc in another embodiment (part 1), the wobbles “WBL” defined by a frequency that is an integral multiple of the first reference frequency, i.e. a tenfold frequency (i.e. another specific example of the “predetermined clock information” of the present invention) are pre-formatted.
Specifically, in the optical disc in another embodiment (part 1), as shown in FIG. 12 and FIG. 13( a), 80 pieces of wobbles (or 80 wobbles) “WBL” are formed in one sync frame. In other words, one Even sync frame is constituted by WBL“1” to WBL“80”, and one Odd sync frame is constituted by WBL “81” to WBL “160”.
In addition, there are only three land pre-pits (i.e. one specific example of the “predetermined address information” of the present invention) (hereinafter referred to as “LPP” as occasion demands) formed in each one sync frame, i.e. substantially in each 80 pieces of wobbles. The three LPPs are formed in the 30 pieces of wobbles from the first wobble. In other words, the three LPPs are formed by a unit of a group of ten wobbles, at the first wobbles of the units, respectively. That is, a cycle “Tstd” in which the LPPs are formed shown in FIG. 13( a) is equal to a cycle “Tstd” in which the address information “LPPstd” is formed shown in FIG. 13( b).
As a result, the frequency of the wobbles “WBL” (i.e. one example of the predetermined clock information) is 10 times, i.e., an integral multiple of the first reference frequency (Fstd: reference frequency for DVD-R/RW). Thus, it is possible to pre-format the predetermined address information “LPP”, (i) which cannot be detected by the conventional reproducing apparatus that can detect the address information “LPPstd” (i.e. one specific example of the “first address information” of the present invention), such as LPP (Land Pre-Pit), pre-formatted with the first reference frequency and (ii) which can hold a simple and proper phase relationship with the predetermined clock information.
(3-2) Optical Disc in Another Embodiment—Part 2—
As shown in FIG. 14, the frequency “Fwbl” of the wobbles “WBL” (one example of the predetermined clock information) described above may be further included in the second frequency band that can be defined by a second reference frequency “Fstd2”. Here, the “second frequency band” in another embodiment means a frequency band that is not detected as the second reference frequency by the conventional reproducing apparatus for judging whether or not the frequency of the clock information can be detected (or identified) as the second reference frequency “Fstd2”, on the basis of the self-correlation. Incidentally, the wobble corresponding to the first reference frequency, is referred to as the wobble “WBLstd”, and the wobble corresponding to the second reference frequency, is referred to as wobble “WBLstd2”. That is, the following equation (2) can indicate the second frequency band.
{(2m)×Fstd2−β}<(second frequency band)<{(2m)×Fstd+β} (2)
wherein, “m” is an integer number, and β is a predetermined bandwidth that cannot be detected on the basis of the resolution of the signal processing.
As described above, the frequency of the wobbles “WBL” (one example of the predetermined clock information) described above, i.e. the frequency “Fwbl” that is an integral multiple, such as twice, 10 times, 12 times, or 14 times, of the first reference frequency (Fstd: frequency for DVD-R/RW), is included in the first frequency band which is a frequency band that is not detected as the first reference frequency by one kind of conventional reproducing apparatus. At the same time, it is included in the second frequency band which is a frequency band that is not detected as the second reference frequency by another kind of conventional reproducing apparatus.
As a result, both (i) one kind of conventional reproducing apparatus that can detect the clock information of the first reference frequency (e.g. a reproducing apparatus for DVD-R/RW) and (ii) another kind of conventional reproducing apparatus that can detect the clock information of the second reference frequency (e.g. a reproducing apparatus for DVD+R/RW) cannot detect the wobbles “WBL” (one example of the predetermined clock information), so that it is possible to perform the reproduction process on the information recording medium of the present invention, as in the general read-only information recording medium.
(3-3) Optical Disc in Another Embodiment—Part 3—
As shown in FIG. 15( a), on the information recording/reproducing apparatus in the embodiment, it may be judged whether or not the frequency of the clock information can be detected (or identified) as the first reference frequency (Fstd), using an output value outputted by a detection circuit (or a detection wave circuit) for detecting a signal of the push-pull signal, which passes through a band bass filter “BPF” in which a center frequency is “Fwbl” and a bandwidth is “α”. Specifically, as shown in FIG. 15( b), if a spectrum that is larger than a noise and larger than a predetermined threshold value, is detected at the frequency “Fwbl”, it may be judged that the frequency of the clock information pre-formatted on the optical disc is the first reference frequency.
As a result, according to the recording-type information recording medium, the information recording apparatus, and the information reproducing apparatus in the embodiment described above, it is possible to supply the contents whose copyright is protected by the encryption system, such as a CSS, to a general user, using the information recording medium on which the wobbles “WBL” (one example of the predetermined clock information) described above are pre-formatted. And it is possible to enable the conventional reproducing apparatus to perform the reproduction process on the supplied contents, appropriately and easily. Therefore, according to the optical disc in the embodiment, it is possible to realize both the copyright protection of contents and the retention of reproduction compatibility.
The information recording medium, the information recording apparatus and method, the information reproducing apparatus and method, and the computer program according to the present invention can be applied to an information recording medium, such as an optical disc, on which recording and reproduction can be performed by irradiating it with laser light, such as a DVD (Digital Versatile Disc), a BD (Blu-ray Disc), and a CD (Compact Disc), and also applied to an information recording/reproducing apparatus or the like for the information recording medium. Moreover, they can be applied to an information recording/reproducing apparatus or the like which is mounted on various computer equipment for consumer use or for commercial use, or which can be connected to various computer equipment.
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U.S. Classification 386/252, 386/248, 386/326, 386/353
International Classification H04N9/80, H04N5/92, H04N5/93
Cooperative Classification G11B20/1403, G11B20/0021, G11B20/1262, G11B2220/2566, G11B7/0053, G11B20/00449, G11B20/1217, G11B2220/216, G11B7/24082, G11B20/00086, G11B7/00736, G11B27/3027, G11B7/00745
European Classification G11B20/00P5, G11B20/00P5D4, G11B7/007S, G11B20/12D, G11B7/24082, G11B20/14A, G11B20/00P, G11B27/30C, G11B20/12M, G11B7/005W
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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SHIMIZU, AKIRA;YOSHIDA, MASAYOSHI;HASEBE, TSUYOSHI;AND OTHERS;SIGNING DATES FROM 20081117 TO 20081119;REEL/FRAME:021961/0221