HK1086932B - Method of recording physical address information and method of recording and/or reproducing data - Google Patents

Description

Method of recording physical address information and data recording and/or reproducing method

Technical Field

The present invention relates to an optical disc, and more particularly, to a method of recording physical address information on an optical disc and an optical disc having the physical address information.

Background

In general, when recording data on an optical disc, a basic recording unit having a fixed size, which is called a recording block or an Error Correction Code (ECC) block, is always used in the optical disc. When a recording block is recorded on the optical disc, a recording physical address indicating the position of the recording block on the optical disc is also recorded. All physical recording addresses are recorded throughout the optical disc, and they have the same size and structure.

A conventional method of recording address information indicating an address of a recording block on an optical disc may include generating a wobble signal by performing wobble (wobbble) modulation on the address information and generating a track of the optical disc having the same shape as the wobble signal.

Fig. 1 shows tracks of a disc having the same shape as a wobble signal indicating physical address information.

The wobble modulation methods include single frequency wobble (MW) modulation, sawtooth wobble (STW) modulation, Binary Phase Shift Keying (BPSK) modulation, Frequency Shift Keying (FSK) modulation, and Minimum Shift Keying (MSK) modulation. Since wobble modulation of address information is advantageous for improving the access characteristics of an optical disc such as motor speed control, the method is widely applied to recording address information of recording blocks on an optical disc.

Other kinds of information, such as the type and characteristics of the optical disc, may be included in the wobble in addition to the address information. Only one type of wobble is used in the entire optical disc, and when recording address information is included in the wobble, the recording addresses have the same structure.

Referring to fig. 1, a track has the same shape as a wobble signal generated according to MW modulation in which address information is modulated into a single-frequency sine wave. A mark (mark) corresponding to recorded data is formed in the middle of the track. As shown in fig. 1, the wobble signal formed on the track and indicating the address of one recording block has the same length as the one recording block.

Fig. 2 shows a wobble signal generated using conventional Phase Shift Keying (PSK) modulation. The wobble signal shown in fig. 2 corresponds to a basic wobble signal of 10 periods. In fig. 2, the upper part of the curve represents the wobble signal formed on the track and the lower part of the right-angled line represents the square wave generated by processing the wobble signal using a predetermined method, which square wave has been read by the optical head of the optical disc drive.

The square wave shown in fig. 2 indicates data values of 0, 1, 0, 1, 0, and 0 included in a wobble signal corresponding to 10 periods of a basic wobble signal. A wobble signal corresponding to the basic wobble signal having a data value of "0" of 83 periods is recorded before a wobble signal corresponding to the basic wobble signal of 10 periods. The wobble signal corresponding to the 93 periods of the basic wobble signal indicates an address information bit value of "1". A total of 52 bits is used to indicate the recording address of one recording block.

Fig. 3 shows a wobble signal generated using conventional MSK modulation. The wobble signal corresponds to 8 periods of the basic wobble signal.

The wobbles corresponding to one period of the basic wobble signal have different frequencies "f" and "1.5 f". According to the conventional MSK modulation, one address information bit is represented by a wobble signal corresponding to 56 basic wobble signals. In the wobble signal corresponding to the 56 periods of the basic wobble signal, the value of one address information bit is determined by the positions of three consecutive wobbles having frequencies of 1.5f, and 1.5f, respectively, in this order. According to the conventional MSK modulation shown in fig. 3, a total of 83 bits represents a recording address of one recording block.

Fig. 4 illustrates an example of a conventional method of recording physical addresses on an optical disc using land pre-pits (LPPs). When an optical disc includes land tracks (land tracks) and groove tracks (groove tracks), data, for example, user data is recorded on the groove tracks, and pits indicating corresponding physical addresses are formed on the land tracks.

Referring to fig. 4, a data value is determined by the presence and absence of pits at a peak (peak) of a single-frequency wobble formed along a land track. In other words, when a pit is formed on a land track, the data value is "1". When a pit is not formed on the land track, the data value is "0". When 208 such data values are obtained, 12 bits of address information are represented. 192 address information bits indicate the address of one recording block.

Recently, attempts have been made to: for portable electronic devices, such as camcorders, that record and/or reproduce audio information and video information together, optical discs are used as information storage media. However, the use of conventional optical discs in portable electronic devices is problematic. For example, a conventional optical disc having a size of 80mm or 120mm is too large to be used as an information storage medium for a camcorder and requires a large amount of power.

In order to use an optical disc as an information storage medium for portable electronic devices such as a camcorder or a digital camera, a compact optical disc having a smaller size and a higher data recording density than conventional optical discs is desired. However, when data is recorded on a compact disc using conventional recording blocks (or ECC blocks), a problem may occur in an inner radius area of the compact disc.

Fig. 5 illustrates the innermost of a compact optical disc on which data is recorded in units of conventional recording blocks

A circumferential zone. Referring to fig. 5, when data is recorded in units of conventional 64K-byte recording blocks in a data recording area of an innermost circumference having a radius of 6mm on the compact optical disc in a direction from an inner radius to an outer radius, one conventional recording block occupies an area from a point a to a point D. In other words, a conventional data block occupies two tracks, and the recording blocks overlap in the radial direction of the compact disc. When a defect occurs in a radially overlapping portion of the recording blocks due to scratch, dust, or fingerprint, the defect is more serious than a defect occurring in a non-overlapping portion of the recording blocks. As a result, the error correction performance may be significantly reduced, thereby deteriorating the reliability of the reproduced data.

To prevent radial overlap from occurring in a recording block, recording blocks of different formats may be used. In detail, data is recorded in an inner circumferential area on the compact optical disc in units of a first recording block shorter than a predetermined track at the inner circumference of the compact optical disc, and data is recorded in other areas on the compact optical disc in units of a second recording block longer than the first recording block. The second recording block longer than the first recording block is used because a larger recording block is more advantageous in terms of error correction.

However, when recording blocks of different formats exist in the data recording area, addresses of the recording blocks cannot be recorded on the compact optical disc. This is because, according to the conventional technique shown in fig. 1, the length of address information indicating the address of one recording block is the same as the physical length of the recording block, and the compact optical disc always uses one address recording method and one address information system. Therefore, a new address recording method is desired.

Meanwhile, the problem of radial overlap among recording blocks occurs in a radius smaller than the inner diameter of the conventional compact optical disc, for example, about 6mm, and in the inner circumferential area of the conventional compact optical disc.

Disclosure of the invention

Technical solution

According to an aspect of the present invention, there is provided a method of recording address information of recording blocks on an optical disc so as to record data on the optical disc using recording blocks of different formats.

Advantageous effects

According to the present invention, recording blocks of different formats are used, and physical address information of different formats corresponding to the recording blocks of different formats is recorded on an optical disc to prevent radial overlap from occurring in the recording blocks when data is recorded on the optical disc. Therefore, the recording position of each recording block can be efficiently expressed on the optical disc.

Drawings

These and/or other aspects and advantages of the present invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 illustrates a conventional disc track having the same shape as a wobble signal indicating physical address information;

fig. 2 illustrates a wobble signal generated using conventional Phase Shift Keying (PSK) modulation;

fig. 3 illustrates a wobble signal generated using a conventional Minimum Shift Keying (MSK) modulation;

fig. 4 illustrates an example of a conventional method of recording physical addresses on an optical disc using land pre-pits (LPPs);

fig. 5 illustrates an innermost circumferential area of a compact optical disc on which data is recorded in units of conventional recording blocks;

fig. 6 illustrates a structure of an optical disc according to an embodiment of the present invention;

fig. 7A and 7B illustrate address information corresponding to a first recording block and address information corresponding to a second recording block, respectively;

fig. 8 is a block diagram of a recording and/or reproducing apparatus according to an embodiment of the present invention;

fig. 9 is a more detailed block diagram of the optical recording and/or reproducing apparatus of fig. 8.

Disclosure of Invention

According to an aspect of the present invention, there is provided a method of recording physical address information on an optical disc including a first recording area and a second recording area, wherein data is recorded in the first recording area in units of first recording blocks shorter than a predetermined track in the first recording area, and data is recorded in the second recording area in units of second recording blocks longer than the first recording blocks. The method includes recording first format address information indicating physical address information of a first recording block on the optical disc, wherein the first format address information has the same length as the first recording block; and recording second format address information indicating physical address information of a second recording block on the optical disc, wherein the second format address information has the same length as the second recording block.

According to another aspect of the present invention, there is provided a method of recording information to prevent radial overlap in first and/or second recording blocks on an information storage medium, comprising: setting a first storage area by storing first address information corresponding to the first recording block in the first storage area according to a size of the information storage medium, thereby preventing radial overlap of the first recording block on the information storage medium; and setting a second information storage area, which is disposed outside the first storage area, by storing second address information corresponding to the second recording block, wherein the second recording block is larger than the first recording block.

According to another aspect of the present invention, there is provided a method of recording and/or reproducing data on an information storage medium, including: recording and/or reading data on and/or from a first recording area of the information storage medium in units of first recording blocks, and recording and/or reading data on and/or from a second recording area of the information storage medium in units of second recording blocks; setting a first length of the first recording block and a second length of the second recording block. Wherein the information storage medium includes: a first recording area storing data recorded in a first recording block and corresponding first address information of the first recording block; and a second recording area storing data recorded in second recording blocks and corresponding second address information of the second recording blocks, wherein the second length is greater than the first length to prevent radial overlap of the first recording blocks at an inner track of the information storage medium.

Additional aspects and/or advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Detailed Description

Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

Referring to fig. 6, an optical disc according to an embodiment of the present invention includes a lead-in area, a user data area, and a lead-out area, which are sequentially arranged. To prevent radial overlap from occurring in the recording blocks, data is recorded in the lead-in area in units of first recording blocks, and is recorded in the other areas (i.e., the user data area and the lead-out area) in units of second recording blocks that are longer than the first recording blocks. An area on the optical disc in which data is recorded in units of first recording blocks is referred to as a first recording area, and an area on the optical disc in which data is recorded in units of second recording blocks is referred to as a second recording area.

Address information is recorded in the first recording area (i.e., the lead-in area) according to a first physical address information format for the first recording block; and address information is recorded in the second recording area (i.e., the user data area and the lead-out area) according to a second physical address information format for the second recording block.

In an aspect of the present invention, two formats of recording blocks (i.e., a first recording block and a second recording block) are used to record data on the optical disc, but it should be understood that more than two formats of recording blocks may be used. In addition, the first recording area and the second recording area are defined by a boundary between the lead-in area and the user area, but are not meant to be limited thereto. For example, the first and second recording areas may be defined by another appropriate portion on the optical disc.

Fig. 7A and 7B illustrate address information corresponding to a first recording block and address information corresponding to a second recording block, respectively. Referring to fig. 7A, the first format address information corresponding to the first recording block is in accordance with the length l of the first recording block₁Is recorded. Referring to fig. 7B, the second format address information corresponding to the second recording block is in accordance with the length l of the second recording block₂Is recorded. A length l of the first format address information corresponding to the first recording block₁Length l of the second format address information corresponding to the second recording block₂Is small.

The method of recording the first format address information and the second format address information as shown in fig. 7A and 7B may be implemented in various ways. An aspect of recording physical address information using the wobble will be described below. Hereinafter, the same wobbles provide the same amount of information in the same wobble period, and different wobbles provide different amounts of information in the same wobble period.

In the embodiment of the present invention, the first format address information and the second format address information are recorded on the optical disc using different wobbles, and the amount of the first format address information is the same as the amount of the second format address information. For example, with respect to the wobble signal shown in fig. 2, the wobble corresponding to 93 periods of the basic wobble signal represents one address information bit value "1", and a total of 52 bits represents a recording address of one recording block. Such a wobble is used to record the second format address information, and a wobble corresponding to less than 93 periods of the basic wobble signal is used to represent a bit value of the first format address information. In other words, the amount of the first format address information shorter than the second format address information can be the same as the amount of the second format address information by increasing the recording density when recording the first format address information.

In another aspect of the invention, the same wobble is used to record the first cellFormula address information and the second format address information, and the length of the second format address information and the physical length l of the first format address information₁And accordingly. Neither the address information of the optical disc nor additional information (e.g., the type of the optical disc and characteristics such as recording power, the presence or absence of copy protection) is recorded in the empty space in the area allocated for recording the second format address information on the optical disc.

In another aspect of the invention, different physical address information structures may be used regardless of the wobble, in order to provide different amounts of address information. In other words, the physical length l of the address information in view of the first format₁Is smaller than the physical length l of the second format address information₂The first format address information amount is set smaller than the second format address information amount. For example, the first format address information may be constructed to include 3 bytes of address information, 1 byte of additional information, and 1 byte of parity, and the second format address information may be constructed to include 4 bytes of address information, 3 bytes of additional information, and 3 bytes of parity.

Meanwhile, physical address information is recorded using land pre-pits (LPPs) as shown in fig. 4. In an aspect of the invention, the number of data values represented by pits indicating one physical address information bit value is changed so that the first format address information amount is the same as the second format information amount. According to the method as shown in fig. 4, data values are determined by the presence and absence of pits at the peak of a single-frequency wobble formed along a land track of an optical disc, and 208 data values represent 12 bits of address information. When this second format address information of an aspect of the present invention is recorded using the method shown in fig. 4, the first format address information can be recorded by designing less than 208 data values to represent 12 bits of address information. In the embodiment of the present invention, LPP, i.e., recording physical address information on a land track of the optical disc, is used. However, aspects of the present invention are not limited thereto. For example, groove-pre pit (GPP) may be used, i.e., physical address information may be recorded on a groove track of an optical disc.

In another embodiment of the present invention, the first format address information and the second format address information may be recorded in different structures by forming and not forming pits on a land track of the optical disc. In other words, the physical length l of the address information in view of the first format₁Is smaller than the physical length l of the second format address information₂The first format address information amount is set smaller than the second format address information amount. For example, the first format address information may be constructed to include 3 bytes of address information, 1 byte of additional information, and 1 byte of parity, and the second format address information may be constructed to include 4 bytes of address information, 3 bytes of additional information, and 3 bytes of parity.

In another embodiment, when two or more different structures having wobbles providing different amounts of information are used to record physical address information on an optical disc, information identifying the structure of the physical address information may be additionally recorded on the optical disc. The optical disc may be a CD-R, CD-ROM, DVD, Blu-ray disc, Advanced Optical Disc (AOD), or the like.

Fig. 8 is a block diagram of an optical recording and/or reproducing apparatus according to an embodiment of the present invention in which address information of the recording blocks and the information storage medium of fig. 6, 7A, and 7B is implemented. Referring to fig. 8, the recording and/or reproducing apparatus includes: a write/read unit 1000 and a control unit 1002. The write/read unit 1000 reads or writes data from or to the information storage medium 130 according to a command from the control unit 1002. Here, the information storage medium 130 includes several examples shown in fig. 6, 7A, and 7B, and the control unit 1002 controls the writing/reading operation of the writing/reading unit 1000 to prevent radial overlap of the first recording blocks having the recorded address information in the inner track.

Referring to fig. 8, the writing/reading unit 1000 records data on a disc 130, which is an information storage medium according to an embodiment of the present invention, and reads out the data to reproduce the recorded data, according to the control of the control unit 1002. The control unit 1002 controls the writing/reading unit 1000 so that the writing/reading unit 1000 records data in the first and second recording unit blocks having different lengths, or processes data read out by the writing/reading unit 1000 and obtains an effective value. The reproduction refers to obtaining valid data by performing error correction on the read data and is performed in a predetermined unit. A unit for performing reproduction is referred to as a reproduction unit block. The reproducing unit block corresponds to at least one recording unit block.

Fig. 9 is a more detailed block diagram of the optical recording and/or reproducing apparatus of fig. 8. Referring to fig. 9, an information storage medium 130 is loaded into the writing/reading unit 1000. The recording and/or reproducing apparatus further includes an optical head 1100 that reads from and writes to the information storage medium 130. The control unit 1002 includes a PC I/F1101, a DSP 1102, an RF AMP1103, a servo 1104, and a system controller 1105, all of which constitute the control unit 1002 of fig. 8.

In the data recording operation, the PC I/F1101 receives a recording command from the host computer to cause data to be recorded. The DSP 1102 adds additional data such as parity for error correction of data received from the PC I/F1101, and performs Error Correction and Check (ECC) encoding to generate an ECC block, which is an error correction block, and modulates the ECC block according to a predetermined method. The RF AMP1103 converts data output from the DSP 1102 into an RF signal. The optical head 1100 records the RF signal output from the RF AMP1103 on the optical disc 130 in the first and second recording blocks as shown in fig. 7A and 7B. The servo 1104 receives a command required for servo control from the system controller 1105 and servo-controls the optical head 1100.

In a data reproduction operation, the PC I/F1101 receives a reproduction command from a host (not shown). The system controller 1105 performs initialization required for reproduction. The optical head 1100 emits a laser beam onto the optical disc 130, obtains an optical signal by receiving the reflected light beam from the optical disc 130, and outputs the optical signal. The RF amp1103 converts an optical signal output from the optical head 1100 into an RF signal, and supplies modulated data obtained from the RF signal to the DSP 1102 while supplying a servo signal for control of the optical head 1100 obtained from the RF signal to the servo 1104. The DSP 1102 demodulates the modulated data, performs error correction, and outputs the resultant data.

Meanwhile, the servo 1104 performs servo control of the optical head 1100 by using a servo signal obtained from the RF AMP1103 and a command required for servo control received from the system controller 1105. The PC I/F1101 transfers data received from the DSP 1102 to the host.

As described above, according to the embodiments of the present invention, recording blocks of different formats are used and physical address information of different formats corresponding to the recording blocks of different formats is recorded on an optical disc to prevent radial overlap from occurring in the recording blocks when data is recorded on the optical disc. The recording position of each recording block can be efficiently represented in the optical disc.

Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.

Claims (10)

1. A method of recording physical address information on an optical disc including a first recording area and a second recording area, wherein data is recorded in the first recording area in units of first recording blocks shorter than a predetermined track in the first recording area, and data is recorded in the second recording area in units of second recording blocks longer than the first recording blocks, the method comprising:

recording first format address information indicating first physical address information of a first recording block in a first recording area, wherein the first format address information has the same length as the first recording block; and

second format address information indicating second physical address information of a second recording block is recorded in the second recording area, wherein the second format address information has the same length as the second recording block.

2. The method of claim 1, wherein the first format address information and the second format address information are recorded on the optical disc using different wobbles, respectively.

3. The method of claim 1, wherein the first format address information and the second format address information are recorded in the same information amount using the same wobble, and additional information is recorded in a blank space in an area allocated on the optical disc for the second format address information.

4. The method of claim 1, wherein the first format address information and the second format address information each have a different structure.

5. The method according to claim 1, wherein the first recording area is a lead-in area, and the second recording area is a remaining area of the optical disc except the lead-in area.

6. A method of recording information on an information storage medium preventing radial overlap in first and/or second recording blocks, comprising:

setting a first storage area by storing first address information corresponding to the first recording block in the first storage area according to a size of the information storage medium, thereby preventing radial overlap of the first recording block on the information storage medium; and

a second information storage area is set by storing second address information corresponding to the second recording block, the second storage area being arranged outside the first storage area, wherein the second recording block is larger than the first recording block.

7. The method of claim 6, wherein storing the second address information comprises adjusting an amount of the second address information stored so that the amount is equal to or greater than an amount of the first address information.

8. The method of claim 6, wherein the first address information and the second address information each have a different structure.

9. The method of claim 6, wherein the setting the first storage area comprises setting the first storage area as a lead-in area of the information storage medium.

10. A method of recording and/or reproducing data on an information storage medium, comprising:

recording and/or reading data on and/or from a first recording area of the information storage medium in units of first recording blocks, and recording and/or reading data on and/or from a second recording area of the information storage medium in units of second recording blocks; setting a first length of the first recording block and a second length of the second recording block,

wherein the information storage medium includes: a first recording area storing data recorded in a first recording block and corresponding first address information of the first recording block; and

and a second recording area storing data recorded in second recording blocks and corresponding second address information of the second recording blocks, wherein the second length is greater than the first length to prevent radial overlap of the first recording blocks at an inner track of the information storage medium.