KR20040023419A - Information storage medium, apparatus of recording and/or reproducing and method thereof - Google Patents

Abstract

PURPOSE: An information recording medium, and a device and a method for recording/playing the same are provided to record information data by using an RLL(Run Length Limited) modulation method for the information data in a user area and using a bi-phase modulation method for the information data in an additional information area. CONSTITUTION: The first modulator/synchronization inserter(41) performs the RLL modulation for the data recorded to the user area according to a modulation clock signal generated from a clock rate converter(43) and inserts a synchronization pattern. The second modulator/synchronization inserter(42) performs the bi-phase modulation for the data recorded to the additional information area according to a bi-phase clock signal generated from the clock rate converter and inserts the synchronization pattern. A selector(45) selects the modulated stream of the first modulator/synchronization inserter or an output stream of the bit expander. A recording waveform generator(46) outputs a recording pulse by generating the selected bit stream into a waveform finally recorded to the disc.

Description

Information storage medium, apparatus of recording and / or reproducing and method

The present invention relates to an information storage medium, a recording and / or reproducing apparatus, and a method thereof, and more particularly, to an information storage medium, a recording and / or reproducing apparatus, in which information data is recorded in different modulation schemes for a user area and other areas. It's about how.

In general, an optical disc is widely used as an information storage medium for recording / reproducing information in a non-contact manner by an optical pickup device, and according to an information recording capacity, a compact disc (CD) and a digital versatile disc (DVD) are used. It is divided into. Optical discs that can be recorded, erased, and played back include 650MB (Mega Bytes) CD-R (Recordable), CD-RW (Rewritable), 4.7GB (Giga Bytes) DVD + RW, and 650MB for playback only. CD, 4.7GB DVD-ROM (Read-only Memory). Furthermore, HD (High Density) -DVD with recording capacity of more than 23GB is being developed.

Widely used optical discs, such as CD and DVD, are used with the Four Fourteen Modulation (EMF) modulation and the EFM + (Eight Fourteen Modulation Pluse) modulation, respectively. k) A Run Length Limited (R) (d, k) modulation scheme that satisfies k), and more specifically, adopts an RLL (2,10) modulation scheme to achieve a minimum pit of 3T (T: basic clock period during recording / reproducing or Pits are formed on the disc with lengths of 4T, 5T, ... 11T). Another modulation method is the RLL (1,7) modulation method used in MODD (Magneto Optical Disc Drive), and the pits are molded on the disc with the minimum feet of 2T and the length of 3T, 4T, ... 8T. .

Fig. 1 is a general RLL (1,7) modulation scheme, and a synchronization pattern using 9T having a length range between 2T and 8T with pit and space and a pit and space outside the data range (2T-8T). Is a histogram of the reproduction signal when the pits are molded on the optical disk. The overlapping part around each T is the part where an error occurs. In the drawing, a portion where two histograms overlap with each other based on a dotted line becomes a portion where an error occurs. Therefore, on the optical disc, it is common to form the T interval within the run length range in which the pit or the space is limited, and in this case, the overlapped portion as in the histogram shown in FIG. 1 becomes an error.

Accordingly, it is an object of the present invention to provide an information storage medium, a recording and / or reproducing apparatus, and a method in which information data is recorded in different modulation schemes according to areas.

Another object of the present invention is an information storage medium in which information data in a user area uses an RLL (d, k) modulation method and information data in a side information area is recorded using a bi-phase modulation method, recording and / or Or a reproducing apparatus and method thereof.

It is still another object of the present invention to provide an information storage medium, a recording and / or reproducing apparatus, and a method in which information data is recorded using only a portion of a pit or space in a user area in an additional information area.

1 is a diagram showing a histogram of a signal reproduced from a general optical disc;

2 is a view showing a layout of an information storage medium according to the present invention;

3 shows a histogram of signals reproduced from an additional information area on the information storage medium shown in FIG. 2;

4 is a block diagram according to an embodiment of a recording apparatus according to the present invention;

5 is a block diagram according to an embodiment of a playback apparatus according to the present invention.

The above object is, according to the present invention, a first area for storing data modulated by a first modulation scheme; Including a second area for storing data modulated by a second modulation scheme, the data modulated by the second modulation scheme is stored using only a portion of a pit or space formed on a medium by the first modulation scheme. Is achieved by an information storage medium.

According to another aspect of the present invention, an object of the above is an apparatus for recording information data in an information storage medium having at least a first area and a second area, comprising: a first modulating input data data by a first modulation scheme; Modulation means; Second modulation means for modulating input information data by a second modulation scheme; And recording means for recording data modulated by the first modulation means in the first region, and recording data modulated by the second modulation means in the second region. The modulated data is achieved by the recording apparatus, characterized in that it uses only a part of the pits or spaces formed on the medium by the first modulation method.

Also, the above object is to reproduce data stored in an information storage medium including at least a first area for storing data modulated by the first modulation scheme and a second area for storing data modulated by the second modulation scheme. An apparatus comprising: binarization means for binarizing a reproduction signal read from an information storage medium to provide a binarized reproduction signal; Clock generation means for generating a reproduction clock signal from said binarized reproduction signal and generating a clock signal decimated by said predetermined number of reproduction clock signals; First restoring means for restoring the binarized reproduction signal corresponding to the first modulation scheme in accordance with the reproduction clock signal; And second restoring means for restoring the binarized reproduction signal corresponding to the second modulation scheme in accordance with the decimated clock signal.

According to another field of the present invention, the above object is a method for recording information data in an information storage medium having at least a first area and a second area: (a) inputting information data by a first modulation scheme; Modulating; (b) modulating the input information data by a second modulation scheme; And (c) recording data modulated by the first modulation scheme in the first region, and writing data modulated by the second modulation scheme in the second region. The data modulated by the method is achieved by a recording method characterized by using only a part of the pits or spaces formed on the medium by the first modulation method.

Also, the above object is to reproduce data stored in an information storage medium including at least a first area for storing data modulated by the first modulation scheme and a second area for storing data modulated by the second modulation scheme. A method comprising: (a) binarizing a reproduction signal read from an information storage medium to provide a binary reproduction signal; (b) restoring the binarized reproduction signal corresponding to the first modulation scheme according to a reproduction clock signal; And (c) restoring the binarized reproduction signal corresponding to the second modulation scheme in accordance with the clock signal decimated with a predetermined number of the reproduction clock signals.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

2 shows a layout of an information storage medium according to the present invention, which includes a user data information area (hereinafter referred to as a user area) and other areas (hereinafter, referred to as additional information areas). It consists of at least one additional information area and a user area. In the drawing, the additional information area is located before the user area, but its position and the number of areas are not fixed. This additional information area contains information related to Copy Protection, Disc Manufacturer information, Contents Provider information, Contents Right information, Content Specification information, or within the User Area. Additional information and the like for error correction of data may be recorded. The additional information area may be referred to by various names such as a data link block or a run in / out area according to the type of the disc.

The user area on the information storage medium of the present invention adopts the RLL (d, k) modulation scheme, and uses the RLL (2,10) or RLL (1,7) modulation, but the RLL (2,10) in the additional information area. Or a modulation method using only a part of 3T-11T or 2T-8T respectively shown in RLL (1,7) modulation. The synchronization pattern uses the same pits or spaces in common in the user area or the additional information area. In the case of the RLL (1,7) modulation method, for example, a 9T sync pattern including a pit or a space is used, and in the case of an RLL (2,10) code, a 12T sync pattern including a pit or a space, for example. Used as Therefore, the additional information area stores the information by biphasically modulating the pit or space of some of 3T-11T or 2T-8T, which are respectively shown in the RLL (2,10) or RLL (1,7) modulation scheme.

Information used for biphasic modulation consists of pits and spaces of nT and 2nT, where n is an integer and is used within a range satisfying 2 ≦ n ≦ 5. The reason for limiting the range of n is that 2nT should not be longer than the longest pit or space in the sync pattern in consideration of the length of the pit or space used as the sync pattern.

For example, when the RLL (1,7) modulation scheme is used in the user domain, 3T and 6T are used as the pit or space for biphase modulation outside the user domain, and 9T is included as the synchronization pattern.

FIG. 3 shows a histogram of pit and spaces reproduced from the additional information area shown in FIG. 2 after recording using 3T and 6T and data synchronization pattern 9T using bi-phase modulation. In the additional information area, when 3F and 6T are used for the pit or space by bi-phase modulation and 9T is included for the sync pattern, 3T can be read as 2T or 4T during playback, but all can be corrected to 3T. Similarly, a 6T pit or space may be mistaken for 5T or 7T but can be corrected for 6T. The 9T pits or spaces used in the sync pattern can also be read as 8T and 10T, but all can be corrected as 9T. Because the pit or space used in the additional information area other than the user area is used in the user area and the RLL (1,7) uses only 3T, 6T, and 9T, 2T and 4T are close to this. 3T, 5T, 7T is close to 6T, 8T, 10T can be modified to close to 9T.

In another embodiment, when the RLL (2,10) modulation scheme is used in the user domain, when the pit or space for biphase modulation is recorded using 4T and 8T and 12T is included as a sync pattern outside the user domain, 3T and 5T are close to 4T, 7T and 9T are close to 8T, and 11T and 13T are close to 12T. When information is stored in this manner, the detection window width can be increased by three times or more than the conventional modulation methods of RLL (1,7) and RLL (2,10), thereby reducing data errors.

4 is a block diagram according to an embodiment of a recording apparatus according to the present invention.

Referring to FIG. 4, the first modulator & sync inserter 41 has an RLL (d, k) for data to be recorded in a user area input according to a modulated clock signal ExpCLK generated by the clock rate converter 43. Perform modulation, e.g., RLL (1,7) or RLL (2,10) modulation, and insert a sync pattern. That is, in the RLL (1,7) modulation method, data is recorded in pits and spaces having a length of (2T-8T), and a 9T sync pattern of pits and spaces is inserted. In the RLL (2,10) modulation scheme, data is recorded in pits and spaces having a length of (3T-11T), and 12T synchronization patterns of pits and spaces are inserted.

The second modulator & sync inserter 42 performs a biphase modulation on the information data to be recorded in the additional information area input according to the biphase clock signal BiCLK generated by the clock rate converter 43, and performs a synchronization pattern. Insert it. For example, if the data recorded in the user area has performed RLL (1,7) modulation, the data recorded by the biphasic modulation method is composed of nT and 2nT pits and spaces, where n is 2≤n≤4. It is desirable to be in the range. When n is in the range of 2 ≦ n ≦ 4, data consisting of pits and spaces of nT and 2nT are all included in the pits and space length ranges by the RLL (1,7) modulation scheme. In particular, n is 3, and 3T and 6T are used as the pit or space for biphase modulation, and 9T is included in the sync pattern. Similarly, if the data recorded in the user area has performed RLL (2,10) modulation, the data recorded by the bi-phase modulation scheme is composed of pits and spaces of nT and 2nT, and n is within a range of 2≤n≤5. It is desirable to have. In particular, n is 4, and 4T and 8T are used as the pits or spaces for biphase modulation, and 12T is included in the sync pattern. As described above, when the period of the pit and space using the bi-phase modulation method is used within the period of the period of the pit and space used in the user area, it is possible to use the same phase locked loop (PLL) circuit for playback. have.

The clock rate converter 43 divides the modulated clock signal ExpCLK corresponding to the speed of one cycle T of the recording / reproducing basic clock by a predetermined number N to generate a biphasic clock signal BIPCLK, and modulates it. The clock signal ExpCLK is provided to the first modulator & sync inserter 41, the bit expander 44, and the write waveform generator 46, and the bi-phase clock signal BIPCLK is provided to the second modulator & sync inserter 42. To provide.

The bit expander 44 oversamples or zero bit expands the modulated bitstream output from the second modulator & sync inserter 42 according to the modulation clock signal ExpCLK.

An example of oversampling is that if the bitstream after biphase modulation is 01010011, the bitstream operates according to the biphase clock signal BiCLK divided by one third of the modulation clock signal ExpCLK and modulates the bitstream. Depending on the signal ExpCLK, 0 is oversampled and 1 is oversampled to 111. Then, the bit expander 44 oversamples and outputs the bitstream modulated by 000111000111000000111111 by three times according to the modulation clock signal ExpCLK.

An example of zero bit expansion is that if the bitstream after biphase modulation is 01001010001, this bitstream operates according to the biphase clock signal BiCLK divided by one third of the modulation clock signal ExpCLK and modulates the bit stream. According to the signal EXPCLK, 0 is expanded to 0 and 1 is to 100. Then, the bit expander 44 expands and outputs zero bits in the bi-phase modulated bitstream according to the modulation clock signal ExpCLK.

The selector 45 selects the modulation stream of the first modulator & sync inserter 41 in the user area according to the area control signal provided from the system controller (not shown), and the bit expander 44 in the area other than the user area. Select the output stream. The recording waveform generator 46 generates a waveform to output the recording pulse so that the bitstream selected by the selector 45 can be recorded on the final disk according to the modulation clock signal ExpCLK.

5 is a block diagram according to an embodiment of a playback apparatus according to the present invention.

Referring to Fig. 5, a binarizer 51 binarizes an RF signal reproduced from an information storage medium, i.e., a disc, and detects a bit by oversampling or zero bit expansion during the recording process. 52, a reproduction clock signal PLLCLK corresponding to a basic period T of the recording / reproducing clock signal is generated to generate a decimator 53, a first latch 54, and a first demodulator & sync detector. 55). The decimator 53 generates a clock signal DecCLK decimated by the reproduction clock signal PLLCLK to 1 / N, and provides it to the second latch 56 and the second demodulator & sync detector 57.

The first latch 54 latches the binarized RF signal output from the binarizer 51 according to the reproduction clock signal PLLCLK, and the first demodulator & sync detector 55 is latched in the first latch 54. The data is demodulated in accordance with the modulation scheme used for modulation in accordance with the reproduction clock signal PLLCLK, and the synchronization pattern is detected. The second latch 56 latches the binarized RF signal output from the binarizer 51 according to the decimated clock signal DecCLK, and the second demodulator & sync detector 57 is connected to the second latch 56. The latched data is demodulated corresponding to the modulation method used in modulation according to the decimated clock signal DecCLK, and the synchronization pattern is detected.

The selector 58 provides reconstructed user data output from the first demodulator & sync detector 56 in the user area according to the area control signal, and from the second demodulator & sync detector 57 in the additional information area other than the user area. The restored additional information data is provided.

As described above, according to the present invention, by using different modulation schemes for the user area and other areas, the width of the data detection window is widened and stable data can be reproduced. In addition, since the present invention uses only a part of the pit or space in the user area in the additional information area, there is a shared circuit (PLL circuit), so that the hardware burden of the playback apparatus can be reduced.

Claims (30)

A first area for storing data modulated by the first modulation scheme; Including a second area for storing data modulated by the second modulation scheme, And the data modulated by the second modulation scheme is stored using only part of the pits or spaces formed on the medium by the first modulation scheme. The information storage medium of claim 1, wherein the first area is an area in which user data is stored. The information storage medium of claim 1, wherein the second area is one of an additional information area, a data link block, or a run in / out area in which additional information is stored. The method of claim 3, wherein the additional information includes one or more of copy protection related information, disk manufacturer related information, content provider related information, content ownership related information, content specification related information, or additional information for error correction on user data. Information storage medium comprising a. The information storage medium of claim 1, wherein the first modulation method is an RLL (d, k) modulation method. The information storage medium of claim 1, wherein the second modulation scheme is a biphasic modulation scheme. The method of claim 1, wherein the first modulation scheme is RLL (1,7) modulation, information storage characterized in that the pit or space is composed of 2T ~ 8T (where T is the period of the basic clock during recording or playback) media. An information storage medium according to claim 7, further comprising a 9T sync pattern consisting of pits or spaces. The information storage medium of claim 1, wherein the second modulation method is bi-phase modulation, wherein pits or spaces are composed of nT and 2nT, and n is an integer 2≤n≤4. 10. The information storage medium according to claim 9, wherein n is 3, which is a pit or space of 3T and 6T. The information storage medium according to claim 10, further comprising a 9T synchronization pattern of pits or spaces. The information storage method of claim 1, wherein the first modulation method is an RLL (2, 10) modulation, wherein a pit or a space is comprised of 3T to 11T (where T is a period of a basic clock during recording or reproduction). media. The information storage medium according to claim 12, further comprising a 12T synchronization pattern of pits or spaces. The information storage medium of claim 1, wherein the second modulation method is biphase modulation, wherein pits or spaces are composed of nT and 2nT, and n is an integer of 3≤n≤5. 15. The information storage medium of claim 14, wherein n is 4, which is a pit or space of 4T and 8T. The information storage medium according to claim 15, further comprising a 12T synchronization pattern of pits or spaces. An apparatus for recording information data in an information storage medium having at least a first area and a second area: First modulation means for modulating the input information data by a first modulation scheme; Second modulation means for modulating input information data by a second modulation scheme; And And recording means for recording data modulated by the first modulating means into the first area, and data modulated by the second modulating means into the second area, And the data modulated by the second modulation method uses only a portion of the pits or spaces formed on the medium by the first modulation method. 18. The recording apparatus of claim 17, wherein the first modulating means comprises a first modulator & sync inserter for modulating user data and inserting a sync pattern by an RLL (d, k) modulation scheme. 19. The apparatus of claim 18, wherein the second modulating means is A second modulator & sync inserter for biphasically modulating side information data and inserting a longest pit or space used in the sync pattern inserted by the first modulator & sync inserter into the sync pattern; And And a bit expander for extending bits to the modulated bitstream output from the second modulator & sync inserter. 20. The apparatus of claim 19, wherein a modulated clock signal having a period of a basic clock during recording or reproducing used in the first modulator & sync inserter and the bit expander is generated, and the modulated clock signal is divided to divide the clock signal. And a clock rate converter to provide to the two modulators & sync inserters. 21. The recording apparatus of claim 20, wherein the bit expander performs oversampling or zero bit expansion on the modulated bitstream output from the second modulator & sync inserter according to the modulated clock signal. An apparatus for reproducing data stored in an information storage medium comprising at least a first area storing data modulated by the first modulation scheme and a second area storing data modulated by the second modulation scheme: Binarization means for binarizing a reproduction signal read out from the information storage medium to provide a binarized reproduction signal; Clock generation means for generating a reproduction clock signal from said binarized reproduction signal and generating a clock signal decimated by said predetermined number of reproduction clock signals; First restoring means for restoring the binarized reproduction signal corresponding to the first modulation scheme in accordance with the reproduction clock signal; And And second reconstruction means for reconstructing the binarized reproducing signal corresponding to the second modulation scheme in accordance with the decimated clock signal. 23. The apparatus of claim 22, wherein the clock generating means is A phase locked loop (PLL) circuit for generating a reproduction clock signal from the displaced reproduction signal; And And a decimator for decimating the reproduction clock signal by a predetermined number. 23. The reproducing apparatus as set forth in claim 22, further comprising selecting means for selecting an output of said first restoring means in the user region according to an area control signal, and selecting an output of said second restoring means in the other region. A method of recording information data in an information storage medium having at least a first area and a second area: (a) modulating the input information data by a first modulation scheme; (b) modulating the input information data by a second modulation scheme; And (c) recording data modulated by the first modulation scheme in the first region, and writing data modulated by the second modulation scheme in the second region, And the data modulated by the second modulation method uses only a part of the pits or spaces formed on the medium by the first modulation method. 26. The method of claim 25, wherein in the step (a), the user data is modulated by an RLL (d, k) modulation scheme according to a modulated clock signal having a period of a basic clock during recording or reproducing, and a synchronization pattern is inserted. How to record. The method of claim 26, wherein step (b) (b1) biphasically modulating additional information data according to the clock signal divided by the modulated clock signal, and inserting the longest pit or space used as the sync pattern in the step (a) into the sync pattern; And (b2) extending the bits to the bitstream modulated in step (b1). 28. The recording method according to claim 27, wherein in step (b2), oversampling or zero bit expansion is performed on the bitstream modulated in step (b1) according to the modulation clock signal. A method of reproducing data stored in an information storage medium comprising at least a first area storing data modulated by the first modulation scheme and a second area storing data modulated by the second modulation scheme: (a) binarizing a reproduction signal read from the information storage medium to provide a binary reproduction signal; (b) restoring the binarized reproduction signal corresponding to the first modulation scheme according to a reproduction clock signal; And (c) restoring the binarized reproduction signal corresponding to the second modulation scheme according to the clock signal decimated to 1 / N of the reproduction clock signal. The method of claim 29, (d) generating a reproduction clock signal from the binarized reproduction signal, and generating a clock signal decimated by the predetermined number of reproduction clock signals.