JP2001006293A - Disk recording medium, and disk drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make dealable with even a high density disk and to make keepable the compatibility with a standard disk by using two bits of the most significant bit of second information in a sub-code and the most significant bit of frame information and expressing recording density information and address expansion information. SOLUTION: The recording density information and the address expansion information on the disk recording medium are obtained from detection values of two bits of the most significant bit of the second information and the most significant bit of the frame information in the sub-code read out from the disk recording medium, and the setting processing according to the recording density information and the address detection processing using the address expansion information are performed. For instance, quaternary by these two bits is discriminated, and the setting processing and the address detection processing are performed based on the result detecting whether it is of a first recording density, or is of a second recording density and of an address expansion value zero part, or is of the second density and of an address expansion value (a) part, or is of the second density and of an address expansion value (b) part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a disk recording medium in a CD format and a disk drive apparatus capable of recording or reproducing data in accordance with the disk recording medium.

[0002]

2. Description of the Related Art For example, CD-DA (Compact Disc-Digital Audio), C
D-ROM, CD-R (CD-RECORDABLE), CD-RW
(CD-REWRITABLE), CD-TEXT, so-called CD
Various discs belonging to the family have been developed and spread. As is well known, data such as music, video, computer data, and the like are recorded on such a CD-format disk, and addresses are recorded as subcodes. As the address, an absolute address as a continuous value over the entire disk or a relative address given in units of tracks (also called programs; for example, one music unit in the case of music data) is recorded. Thus, an absolute address (absolute address) and a relative address (relative address) can be recognized by extracting the subcode at each position on the disk. On the innermost side of the disc, a pointer indicating the head or area of each track is described as so-called TOC information, and an address is also used as the pointer.

In the case of the CD format, the address on the subcode is expressed in 8 bits of minutes, seconds, and frames. The 8 bits are BCD (Binary C)
Since it is an oded decimal (binary-decimal) code, “0” to “99” can be expressed by 8 bits. Therefore, 0 minutes to 99 minutes can be expressed as “minutes”. However, the “second” is naturally from “0” to “59”, and the “frame” is defined as 75 frames from frame 0 to frame 74 in the CD format. Is expressed.

[0004]

In response to recent demands for increasing the capacity of recording media, large-capacity disks (for example, current CDs) have been developed by increasing the recording density. Discs realizing double capacity discs) have been developed. Hereinafter, such a disk will be referred to as a "high-density disk" for explanation, and a CD-format disk having a conventional capacity will be referred to as a "standard disk".

However, when such a high-density disc is put to practical use as a variation of the CD format disc, the following problem occurs. For example, in the case of a CD-DA as a standard disc, a maximum of 7
Music data can be recorded in 4 minutes 59 seconds 74 frames. The data capacity is about 800 Mbytes. As the address, minutes / seconds / frames are described by the 8-bit BCD code as described above.
The address expression range is sufficient because it can handle up to 9 seconds and 74 frames. However, in the case of a high-density disk, for example, if the capacity is doubled, recording for about 150 minutes is possible. However, in the address form of the 8-bit BCD code, a portion of 100 minutes or more cannot be completely expressed. Of course, there is no problem if the address format (subcode format) is developed exclusively for the high-density disk. However, in such a case, the compatibility between the standard disk and the high-density disk (and the corresponding disk drive device) cannot be obtained, which is preferable. Absent. Further, the address expression range can be extended by using an area other than minutes / seconds / frames in the subcode (for example, empty bits or bits that are not normally used). However, compatibility can be maintained, and address decoding processing of the drive device can be performed. This is also not desirable from the viewpoint that it does not lead to complication of the system.
For this reason, there is a demand for an address format that can support high-density discs while maintaining compatibility and using only the minute / second / frame area.

In the case where compatibility is further realized, from the viewpoint of the disk drive, when a disk is loaded,
It is desired to be able to immediately determine the disk type of the disk as a standard disk or a high-density disk.

[0007]

According to the present invention, in accordance with such circumstances, the present invention is applicable to a high-density disk, maintains compatibility with a standard disk, and allows an address to be immediately discriminated from a disk type. It provides a form.

Therefore, as the disk recording medium of the present invention, in a disk recording medium of a CD format, two bits, the most significant bit of the second information and the most significant bit of the frame information in the subcode, are used and the recording density is increased. Information and address extension information are represented. For example, four values are represented by two bits, the most significant bit of the second information and the most significant bit of the frame information, and the four values are the first recording density and the second recording density, respectively, and the address extension value is zero. Minute, the second density, that is, the address extension value a, and the second density, that is, the address extension value b (where a） b). Alternatively, the value of one of the two bits, the most significant bit of the second information and the most significant bit of the frame information, represents whether the recording density is the first recording density or the second recording density. The value indicates whether the address extension value is equal to zero or the address extension value a. That is, the second information expressing the value of 0 to 59 and the frame information expressing the value of 0 to 74 are 8 bits B
Since the most significant bit (MSB) of the CD is always “0”, this bit is used to indicate a disk correspondence and an address extension value. The address extension value only needs to be able to represent, for example, a value (for example, 100 minutes) added to a value represented by minute information.

A disk drive device according to the present invention corresponding to such a disk recording medium includes a most significant bit of second information and a most significant bit of frame information among subcodes read from a loaded disk recording medium. Control means for obtaining recording density information and address extension information on the disk recording medium from the detected values of the two higher-order bits, and performing a setting process according to the recording density information and an address detection process using the address extension information Be prepared to have. For example, the control means determines a quaternary value of the two bits of the most significant bit of the second information and the most significant bit of the frame information, and determines the first recording density or the second recording density according to the value. To determine whether the address extension value is zero, the second density and the address extension value a, or the second density and the address extension value b. The setting process and the address detecting process are performed based on the setting process. Alternatively, the control means determines whether the recording density is the first recording density or the second recording density based on the value of one of the two bits of the most significant bit of the second information and the most significant bit of the frame information. Detection is performed to detect whether the address extension value is equal to zero or address extension value a by the value of the other bit, and the setting process and the address detection process are performed based on each detection result.

[0010] The disk recording medium of the present invention includes:
When the value of the upper 4 bits of the minute information is “A” or more in hexadecimal notation (that is, the 4 bits are “1010” or more), the 8-bit minute information whose 8-bit minute information is different from the BCD code value To be represented by That is, the minute information as an 8-bit BCD code is “0” to “99”.
However, the upper 4 bits represent "0" to "9", and there is no case where the value is "A" or more. Therefore, the address expression range can be expanded by defining the case of “A” or more and by using a code that can cover a larger numerical value with 8 bits. For example, it is conceivable to use a binary code.

In the disk drive of the present invention corresponding to such a disk recording medium, the value of the upper 4 bits of the minute information in the subcode read from the loaded disk recording medium is “A”. It is determined whether or not the address is not less than "A". If the value is not equal to or more than "A", the address detection processing is performed by recognizing the 8-bit information as a BCD code value. Control means for recognizing the 8-bit information as an 8-bit code value (for example, a binary code) different from the BCD code value and performing an address detection process is provided.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in the following order. As embodiments, first to third disk examples and corresponding examples of first to third disk drive devices will be described. 1. Disk type 2. 2. Subcode and TOC 3. First disc example 4. Second disc example 5. Third disc example 6. Configuration of disk drive device 7. Processing example of first disk drive device 8. Processing example of second disk drive device Processing example of the third disk drive device

1. 1. Disc Type FIG. 1 shows the type of disc realized as the CD-format disc of the present embodiment. FIG. 1A shows a standard disc in which the entire area of the disc has a conventional recording density. CD-DA, CD-ROM, and CD currently in widespread use
-R, CD-RW and the like correspond to this. FIG. 1 (b)
Is a high-density disc developed in recent years.
This is a type in which the entire area of the disc is recorded at high density.
For example, a disc having a density twice or more than that of a standard disc has been developed. FIGS. 1C and 1D show a hybrid disc in which a standard density area and a high density area are separated on the inner circumference side and the outer circumference side (or vice versa).

For example, when considering a standard disk and a high-density disk shown in FIGS. 1A and 1B, it is necessary for the disk drive device to determine the disk type when the disk is loaded. Also, considering the hybrid discs shown in FIGS. 1C and 1D, the disc drive device needs to determine the area type of the area currently being recorded or reproduced is a high-density area or a standard-density area. is there.

In the embodiment of the present invention to be described below, the addresses indicated in the subcodes can express a sufficient address value range even for a high-density disk, and the disk type / area type Is included.

2. Subcode and TOC The TOC and the subcode recorded in the lead-in area on the CD format disc will be described. The minimum unit of data recorded on a CD disk is one frame. One block is composed of 98 frames.

The structure of one frame is as shown in FIG. 1
The frame is composed of 588 bits. The first 24 bits are used as synchronization data, and the following 14 bits are used as a subcode data area. After that, data and parity are allocated.

One block is composed of 98 frames, and the subcode data extracted from the 98 frames are collected to form one block of subcode data (subcoding frame) as shown in FIG. ) Is formed. First and second frames at the beginning of 98 frames (frame 98n + 1, frame 98n + 2)
Is a synchronization pattern.
Then, from the third frame to the 98th frame (frame 9
8n + 3 to frame 98n + 98), each of which has 96 bits of channel data, that is, P, Q, R, S, T, U,
V and W subcode data are formed.

Of these, P for managing access and the like
Channel and Q channel are used. However, the P channel only indicates a pause portion between tracks, and the finer control is performed on the Q channel (Q1 to Q1).
Q96). The 96-bit Q channel data is configured as shown in FIG.

First, the four bits Q1 to Q4 are used as control data, and are used for discrimination of the number of audio channels, emphasis, CD-ROM, digital copy availability, and the like.

Next, the four bits Q5 to Q8 are set to ADR, which indicates the mode of the sub-Q data. Specifically, the mode (sub-Q data content) is expressed by the four bits of ADR as follows. 0000: Mode 0: Basically, sub-Q data is all zero (used in CD-RW) 0001: Mode 1: Normal mode 0010: Mode 2: Indicates the catalog number of the disc 0011: Mode 3 ..ISRC (International St
0100: Mode 4: Used for CD-V 0101: Mode 5: CD-R, CD-RW, CD
-Used in multi-session systems such as EXTRA

The 72 bits Q9 to Q80 following the ADR are used as sub-Q data, and the remaining Q81 to Q96 are CR bits.
C.

In the lead-in area of the disc,
The sub-Q data recorded there is the TOC information. That is, the 72-bit sub Q data of Q9 to Q80 in the Q channel data read from the lead-in area has information as shown in FIG. FIG. 4A shows the structure of FIG. 3B in the lead-in area in detail for the 72-bit sub Q data portion. Sub Q data is 8 for each
It has bit data and represents TOC information.

First, a track number (TNO) is recorded with eight bits Q9 to Q16. In the lead-in area, the track number is fixed to “00”. Then Q17 ~
POINT (point) is described by 8 bits of Q24. Q25-Q32, Q33-Q40, Q41-Q48
MIN as the elapsed time in the track
(Minute), SEC (second), and FRAME (frame) are shown. Q49 to Q56 are set to “00000000”. Further, Q57 to Q64, Q65 to Q72, Q73
PMIN, PSEC, PFR with 8 bits for each of ~ Q80
AME is recorded, but this PMIN, PSEC, PF
The meaning of RAME is determined by the value of POINT.

When the value of POINT is "01" to "99", the value of POINT means a track number,
In this case, in PMIN, PSEC, and PFRAME, the start point (absolute time address) of the track of the track number is minute (PMIN), second (PSE).
C), frame (PFRAME).

When the value of POINT is "A0", PM
The track number of the first track is recorded in IN.
Further, specifications such as CD-DA (digital audio), CD-I, and CD-ROM (XA specification) are distinguished by the value of PSEC. When the value of POINT is “A1”, the track number of the last track is recorded in PMIN. When the value of POINT is “A2”, the PMI
The start point of the lead-out area is the absolute time address (minute (PMIN), N, PSEC, PFRAME).
Seconds (PSEC), frames (PFRAME)).

For example, in the case of a disc on which six tracks are recorded, data is recorded as a TOC using such sub-Q data as shown in FIG. TOC
Therefore, the track numbers TNO are all "00" as shown in FIG. Block NO. Is 9 as described above
It shows the number of one unit of sub-Q data read as block data (sub-coding frame) of eight frames. Each TOC data has the same contents written over three blocks. As shown in the figure, when POINT is "01" to "06", PMIN, P
The start points of the first track # 1 to the sixth track # 6 are shown as SEC and PFRAME.

When POINT is "A0", PM
“01” is shown as the first track number in IN. The disc is identified by the value of PSEC, and is "00" in the case of a normal audio CD. If the disc is a CD-ROM (XA specification), P
SEC = “20”, and “10” for CD-I.

When the value of POINT is "A1", P
The track number of the last track is recorded in MIN,
When the value of POINT is “A2”, PMIN, PSE
C, PFRAME indicate the start point of the lead-out area. After block n + 27, block n
.. N + 26 are repeatedly recorded.

In a program area and a lead-out area in which music and the like are recorded as tracks # 1 to #n, the sub-Q data recorded therein has the information shown in FIG. FIG. 4B shows the structure of FIG. 3B in the program area and the lead-out area in detail for a 72-bit sub Q data portion.

In this case, first, a track number (TNO) is recorded by eight bits Q9 to Q16. That is, for each of the tracks # 1 to #n, the value is any one of "01" to "99". In the lead-out area, the track number is "AA". Subsequently, an index is recorded in 8 bits Q17 to Q24. The index is information that can further subdivide each track.

Q25 to Q32, Q33 to Q40, Q41
Each of the 8 bits from Q48 to Q48 indicates MIN (minute), SEC (second), FRA
The ME (frame) is shown. Q49-Q56 is "00
000000 ”. Q57-Q64, Q65-Q
8 bits of 72, Q73-Q80 are AMIN, ASE
C, AFRAME, which are minute (AMIN), second (ASEC), and frame (AF) as absolute addresses.
RAME). The absolute address is an address continuously added from the head of the first track (that is, the head of the program area) to the lead-out area.

In the CD format, the subcode is configured as described above. In the subcode Q data, an area for expressing an absolute address is represented by an AM.
IN, ASEC, AFRAME are arranged, and MIN, SEC, FRAM
E is arranged. Further, PMIN, PMIN,
PSEC and PFRAME are provided. Each of these has a form indicating an address value as minutes, seconds, and a frame number. Each of the 8 bits has a value described in a BCD code.

Absolute address AMIN, ASEC, AFR
FIG. 6 shows an example of an AME and an address value in a BCD code. The BCD code is “0” to 4 bits.
This is a code system representing “9”, and therefore, 8 bits B
According to the CD code, values from “00” to “99” can be expressed. That is, the upper 4 bits are the value of the tens place, the lower 4
Up to “99” is expressed by the bit indicating the numerical value of the one's place.

For this reason, the AMIN (minute) is "00000000" to "10011001" as shown in the figure.
Can take a value from “0” to “99”. Since ASEC (second) only needs to be expressed up to 59 seconds, "00000000" to "01011001"
Takes a value from “0” to “59”. AFRAME
As (frames), since there are 75 frames per second in the CD format, "00000000"
"01110100" is set to a value from "0" to "74".

Here, absolute addresses AMIN, ASE
C, AFRAME as an example, but the relative address MI
The same applies to N, SEC and FRAME.
The same applies to the case where an address is indicated by IN, PSEC, and PFRAME.

In the following description of the disk example, the absolute address AMIN, ASEC, AFRAME is used as an example of expressing the address extension information and the recording density information, but MIN, SEC, FRAME, PMIN, P
AMI to explain SEC and PFRAME
The data structure is the same as the data structure of N, ASEC, and AFRAME. In the description, AMIN, M
IN and PMIN are collectively referred to as "minute information" or "minute", and ASEC, SEC and PSEC are collectively referred to as "second information".
Or "seconds", AFRAME, FRAME, AF
The RAME is collectively referred to as “frame information” or “frame”.

3. First Disc Example A disc as an embodiment of the present invention is a high-density disc such that addresses of 100 minutes, 0 seconds, 0 frames or more can be expressed using minutes / seconds / frames on the above subcode. Is what you do. Further, the recording density information is expressed in minutes / seconds / frames. After realizing them, the address format in the above format, that is, 0 minutes 0 seconds 0 frames to 99 minutes 59 seconds 7
The address range of up to four frames can be expressed in the same manner as described above to maintain compatibility with a standard disc.

FIG. 7 shows a first disk example for realizing this.
This will be described with reference to FIG. In this example, the most significant bit (bit 7) of “second” and the most significant bit (bit 7) of “frame” are used. As can be seen from FIG. 6 described above, in the second (AMIN) formed by 8 bits of bit 0 to bit 7, bit 7 is always "0" in the range of values "0" to "59". Also, for a frame (AFRAME) formed of 8 bits from bit 0 to bit 7, bit 7 is always "0" in the range of values "0" to "74". Therefore, bit 7 of “second” and bit 7 of “frame” can be used for address extension and recording density information.

FIG. 7 shows bit 7 of ASEC and AFRAME.
2 shows information expressed by two bits of bit 7 of the above. With these two bits, “00” “01” “10” “11”
Can be expressed. These values are defined as follows. "0
"0" indicates a standard disc (or standard density area) as recording density information. The address extension value is "+0
Minutes ”. “01” indicates a high-density disk (or high-density area) as recording density information. The address extension value is “+100 minutes”. “10” indicates a high-density disk (or high-density area) as recording density information. The address extension value is “+200 minutes”. “11” indicates a high density disc (or high density area) as recording density information. The address extension value is “+0 minutes”. Note that the address extension value is A
This is a time value to be added to the value represented as the BCD code when bit 7 of the SEC is set to “0”.

By defining as described above, the address value can be expressed up to a maximum of 299 minutes 59 seconds 74 frames. That is, from address 0 minute 0 second 0 frame to 299
Up to minutes 59 seconds 74 frames are represented as shown in FIG.

First, from 0 minute 0 second 0 frame to 99 minute 59 second 74 frame, AMIN represents "0 minute" to "99 minute" by "00000000" to "10011001" as BCD code. At this time, if the disc is a standard disc, ASEC and AFRAME are “0 seconds” to “59 seconds” and “0 frame” to “0 seconds” as shown in FIG.
"74 frames" is a value represented by the BCD code. However, in the case of a high-density disc, ASEC bit 7 is
As shown in FIG. The lower 7 bits (bit 0 to bit 6: “****” in the figure)
"0 seconds" to "59 seconds" are values represented by BCD codes.
Bit 7 of AFRAME is also set to “1”, and the lower 7 bits (bit 0 to bit 6: “######
## ”) are“ 0 frames ”to“ 74 frames ”
This is a value represented by the D code.

Next, from 100 minutes 0 seconds 0 frame to 199 minutes 59 seconds 74 frames (note that the address value is 100
Minutes or more exist only on high density discs), AMIN
Are “00000000” to “100” as BCD codes.
“11001” represents “0 minutes” to “99 minutes”.
The bit 7 of the ASEC is set to “0”, and the lower 7 bits “****” represent “0 seconds” to “59 seconds” as BC.
This is a value represented by the D code. Also bit 7 of AFRAME
Is "1", and the lower 7 bits "########"
"0 frame" to "74 frame" are values represented by BCD codes.

Further, from 200 minutes 0 seconds 0 frame to 299
Up to the minute 59.74 frame, AMIN represents "0 minute" to "99 minute" by "00000000" to "10011001" as BCD code. And ASEC
Bit 7 is set to "1" and the lower 7 bits "****"
“**” is a value representing “0 seconds” to “59 seconds” by a BCD code. Bit 7 of the AFRAME is set to “0”, and the lower 7 bits “########” are values representing “0 frame” to “74 frame” by the BCD code.

In other words, in the case of a high-density disc, if the address value is within the range of 99:59:74, ASEC
Since bit 7 of AFRAME and bit 7 of AFRAME are “11” and the address extension value is “+0 minute”, AM
The value of 0 to 99 minutes represented by IN is recognized as 0 to 99 minutes. On the other hand, bit 7 of ASEC and A
If the bit 7 of the FRAME is “01”, the address extension value is “+100 minutes”. Therefore, the value of 0 minutes to 99 minutes represented by AMIN is added by 100 minutes,
Minutes to 199 minutes. Further, if the bit 7 of the ASEC and the bit 7 of the AFRAME are “10”, the address extension value is “+200 minutes”. Therefore, the value of 0 minutes to 99 minutes expressed by AMIN is added by 200 minutes,
Recognized as 200-299 minutes.

In this way, AMIN, ASEC, AF
Addresses up to 299: 59: 74 frame can be expressed only by RAME. That is, the address range can be expanded to a sufficient address range as a high-density disk. If either one of bit 7 of ASEC and bit 7 of AFRAME is "1", it can be recognized that the disk (or area) has a high density. That is, AMIN, ASEC, A
In the FRAME, recording density information is expressed. further,
Since it directly corresponds to the code system of FIG. 6 in the standard disc, compatibility can be maintained.

Note that bit 7 of ASEC and AFRAME
The upper / lower relationship of the two bits of bit 7 may be set in reverse to this example. Further, as the address extension value,
Although “+100 minutes” and “+200 minutes” are used, other extended values such as “+1 hour” and “+2 hours” may be set.

Note that MIN, SEC, FRAME, and PMIN, PSEC, PFRAME also
The structure is the same as that of N, ASEC and AFRAME.

4. Second Disc Example Next, similarly, using minutes / seconds / frames on the subcode, addresses of 100 minutes 0 seconds 0 frames or more are expressed,
FIGS. 9 and 10 show a second disk example which also expresses recording density information and maintains compatibility with a standard disk in an address range up to 99:59:74 frames.
In this example, the most significant bit (bit 7) of “second” is used for expressing an address extension value, and the most significant bit (bit 7) of “frame” is used for expressing recording density information.

FIG. 9 shows ASEC bit 7 and AFRAM.
Indicates the information represented by bit 7 of E. That is, ASEC
Is “0”, the address extension value “+”
0 minutes ”and“ 1 ”, the address extension value“ +100 ”
Minutes ”. When bit 7 of AFRAME is “0”, it indicates a standard disc (or standard density area), and when bit 7 is “1”, it indicates a high density disc (or high density area).

By defining in this way, the address value can be expressed up to a maximum of 199: 59: 74 frames. That is, the range from the address 0 minute 0 second 0 frame to the 199 minute 59 second 74 frame is represented as shown in FIG.

First, from 0 minutes 0 seconds 0 frames to 99 minutes 59 seconds 74 frames, AMIN represents "0 minutes" to "99 minutes" by "00000000" to "10011001" as BCD codes. At this time, if the disc is a standard disc, ASEC and AFRAME are “0 seconds” to “59 seconds” and “0 frame” to “0 seconds” as shown in FIG.
"74 frames" is a value represented by the BCD code. In the case of a high-density disc, ASEC bit 7 is set to "0" as shown in FIG. And the lower 7 bits "****"
“***” is a value representing “0 seconds” to “59 seconds” by a BCD code. Bit 7 of AFRAME is set to “1”, and the lower 7 bits “########” are values representing “0 frame” to “74 frame” by the BCD code.

Next, from 100 minutes 0 seconds 0 frame to 199 minutes 59 seconds 74 frames, AMIN represents "0 minutes" to "99 minutes" by "00000000" to "10011001" as BCD codes. Then, bit 7 of the ASEC is set to “1”, and the lower 7 bits “****” are set.
“*” Is a value representing “0 seconds” to “59 seconds” in the BCD code. Bit 7 of AFRAME is also set to “1”,
The lower 7 bits “########” are “0 frames” to
"74 frames" is a value represented by the BCD code.

That is, in the case of a high-density disc, if the address value is within the range of 99:59:74 frames, the ASEC
Is "0" and the address extension value is "+0".
Minutes ”, 0 minutes to 99 expressed in AMIN
The value of minute is recognized as 0 to 99 minutes. On the other hand, if the bit 7 of the ASEC is “1”, the address extension value is “+100 minutes”. Therefore, the value of 0 minutes to 99 minutes represented by AMIN is added by 100 minutes, and
Minutes to 199 minutes.

In this way, AMIN, ASEC, AF
Addresses up to 199 minutes 59 seconds 74 frames can be expressed only by RAME. That is, the address range can be expanded to a sufficient address range as a high-density disk. Also, AFRAM
If bit 7 of E is "1", it can be recognized that the disk (or area) has a high density. That is, AMI
Recording density information is expressed in N, ASEC, and AFRAME. In this case as well, FIG.
Since it directly corresponds to the above-mentioned coding system, compatibility can be maintained.

The bit 7 of ASEC is used as an address extension value and the bit 7 of AFRAME is used as recording density information.
Bit 7 of ASEC may be defined as recording density information, and bit 7 of AFRAME may be defined as an address extension value. Further, as the address extension value, other extension values such as “+1 hour” may be set in addition to “+100 minutes”.

Note that MIN, SEC, FRAME, and PMIN, PSEC, PFRAME also correspond to the above-mentioned AMI.
The structure is the same as that of N, ASEC and AFRAME.

5. Third Disk Example Next, a third disk example will be described with reference to FIGS. In this example, up to 195 minutes can be expressed by only 8 bits of “minute”, that is, the address value is “195”.
Minutes 59 seconds 74 frames ". In this case, although the recording density information is not expressed by the 8 bits of “minute”, as in the first or second disk example,
One or both of the bit 7 of “second” and the bit 7 of “frame” may be used to express the recording density information. Excluding the recording density information, the values of “second” and “frame” are represented by the BCD code as in FIG.

In this case, first, as shown in FIG. 11, the 8 bits of AMIN are divided into upper 4 bits M1 (bit 7 to bit 4) and lower 4 bits M2 (bit 3 to bit 0), and the upper 4 bits The address extension information is expressed in M1, and the value to be extended, ie, 10
The value of 0 minutes or more is determined by the upper 4 bits M1 and the lower 4 bits M2.
Is represented by 8 bits including

As can be seen from FIG. 6, in the range up to 99 minutes, the values that can be taken by the upper 4 bits M1 are "0" to "0".
"9". That is, "0000" to "1001". "A (hexadecimal notation)" (= 1010) or more is impossible. Therefore, when the upper 4 bits M1 is a value equal to or larger than "A", the 8 bits of AMIN are defined as a value expressed by a code system different from the BCD code.

Specifically, as shown in FIG.
When the bit M1 is equal to or smaller than "9", the 8 bits of AMIN are expressed by "0 minute" to "99 minutes" by the BCD code, while the upper 4 bits M1 are equal to or larger than "A". In this case, the eight bits of AMIN represent “100 minutes” to “195 minutes” by a binary code. However, when the upper 4 bits M1 becomes "A", that is, AMIN means "100 minutes" as the address value.
When “= 10100000”, the binary code value is “160”. Therefore, actually, it is a value obtained by subtracting “60” from the binary code value.

The value of “minute” indicated by AMIN is
As shown in FIG. The time from 0 minutes to 99 minutes is represented as “00000000” to “10011001” in the BCD code. The period from 100 minutes to 195 minutes is represented by binary codes "10100000" to "11111111". However, this binary code value is "160"
~ "255", the binary code value is 6
By defining the value obtained by subtracting 0 as the value of "minute",
"100 minutes" to "195 minutes" will be expressed.

As described above, AMIN, ASEC, A
Addresses up to 195 minutes 59 seconds 74 frames can be expressed only by FRAME. That is, the address range can be expanded to a sufficient address range as a high-density disk. Also, AMIN
Up to 99 minutes correspond directly to the code system of FIG. 6 on the standard disk, so that compatibility can be maintained. As described above, the recording density information can be expressed by using the bit 7 of ASEC and / or the bit 7 of AFRAME.

Note that MIN, SEC, FRAME, and PMIN, PSEC, PFRAME also
The structure is the same as that of N, ASEC and AFRAME.

6. Configuration of Disk Drive Device Next, a description will be given of a disk drive device corresponding to various types of disks as described above. FIG. 13 is a block diagram of a main part of the disk drive device 70 of the present example. Disc 9
Numerals 0 are loaded on the turntable 7 and are rotated at a constant linear velocity (CLV) or a constant angular velocity (CAV) by the spindle motor 1 during a reproducing operation. The pickup 1 reads data recorded on the disk 90 in the form of embossed pits or phase change pits. The disk 90
Means a standard disk or a high-density disk in the CD format described above.

In the pickup 1, a laser diode 4 as a laser light source, a photodetector 5 for detecting reflected light, an objective lens 2 as an output end of the laser light,
An optical system is formed which irradiates the laser beam onto the disk recording surface via the objective lens 2 and guides the reflected light to the photodetector 5. The objective lens 2 is held by a biaxial mechanism 3 so as to be movable in a tracking direction and a focus direction. The entire pickup 1 can be moved in the disk radial direction by a thread mechanism 8.

The information on the reflected light from the disk 90 is detected by the photodetector 5, converted into an electric signal corresponding to the amount of received light, and supplied to the RF amplifier 9. The RF amplifier 9 includes a current-voltage conversion circuit, a matrix operation / amplification circuit, and the like corresponding to output currents from a plurality of light receiving elements as the photodetector 5, and generates necessary signals by matrix operation processing. For example, it generates an RF signal as reproduction data, a focus error signal FE for servo control, a tracking error signal TE, and the like. The reproduction RF signal output from the RF amplifier 9 is supplied to a binarization circuit 11, and the focus error signal FE and the tracking error signal TE are supplied to a servo processor 14.

The reproduced RF signal obtained by the RF amplifier 9 is 2
The binarized data is converted into a so-called EFM signal (8-14 modulated signal) by the binarization circuit 11 and supplied to the decoder 12. The decoder 12 performs EFM demodulation, error correction processing and the like, and performs CD-ROM decoding and the like as necessary to reproduce information read from the disk 90. The decoder 12 extracts the subcode data and supplies it to the system controller 10.

The decoder 12 stores the decoded data in the cache memory 20 as a data buffer. As the reproduction output from the disk drive device 70, the data buffered in the cache memory 20 is read and transferred and output.

The interface unit 13 is connected to an external host computer 80,
The communication of the reproduction data, the read command, and the like is performed with the communication device.
That is, the reproduction data stored in the cache memory 20 is
The host computer 8 via the interface unit 13
0 is transferred and output. The read command and other signals from the host computer 80 are transmitted to the interface unit 1
3 to the system controller 10.

The servo processor 14 detects various types of focus, tracking, thread, and spindle servo drives from the focus error signal FE and the tracking error signal TE from the RF amplifier 9 and the spindle error signal SPE from the decoder 12 or the system controller 10. A signal is generated to execute a servo operation. That is, the focus error signal FE and the tracking error signal T
A focus drive signal and a tracking drive signal are generated according to E and supplied to the two-axis driver 16. The two-axis driver 16 drives the focus coil and the tracking coil of the two-axis mechanism 3 in the pickup 1. As a result, a tracking servo loop and a focus servo loop are formed by the pickup 1, the RF amplifier 9, the servo processor 14, the two-axis driver 16, and the two-axis mechanism 3.

The servo processor 14 further sends a spindle error signal S to the spindle motor driver 17.
A spindle drive signal generated according to the PE is supplied. The spindle motor driver 17 applies, for example, a three-phase drive signal to the spindle motor 6 according to the spindle drive signal, and executes the CLV rotation of the spindle motor 6. In addition, the servo processor 14 generates a spindle drive signal in response to a spindle kick / brake control signal from the system controller 10, and causes the spindle motor driver 17 to execute operations such as starting, stopping, accelerating, and decelerating the spindle motor 6.

The servo processor 14 generates a thread drive signal based on, for example, a thread error signal obtained as a low-frequency component of the tracking error signal TE or an access execution control from the system controller 10 and supplies the thread drive signal to the thread driver 15. I do. The thread driver 15 drives the thread mechanism 8 according to a thread drive signal. Although not shown, the thread mechanism 8 has a mechanism including a main shaft for holding the pickup 1, a thread motor, a transmission gear, and the like.
5 drives the sled motor 8 according to the sled drive signal, whereby the required sliding movement of the pickup 1 is performed.

The laser diode 4 of the pickup 1 is driven by a laser driver 18 to emit laser light. The system controller 10 sets the control value of the laser power in the auto power control circuit 19 when executing the reproducing operation on the disc 90, and the auto power control circuit 19 performs the laser output according to the set laser power value. The laser driver 18 is controlled so as to be operated.

At the time of the recording operation, a signal modulated according to the recording data is applied to the laser driver 18. For example, when recording is performed on a recordable disc 90, the recording data supplied from the host computer to the interface unit 13 is subjected to processing such as addition of an error correction code, EFM modulation, and subcode by the encoder 20. Then, it is supplied to the laser driver 18.
Then, the laser driver 18 causes the laser diode 4 to perform a laser emission operation according to the recording data, so that data recording on the disk 90 is performed.

The above-described various operations such as servo, decoding, and encoding are controlled by a system controller 10 formed by a microcomputer.
Then, the system controller 10 executes various processes in response to a command from the host computer 80. For example, when a read command requesting transfer of certain data recorded on the disk 90 is supplied from the host computer 80, first, seek operation control is performed for the designated address. That is, a command is issued to the servo processor 14 to execute the access operation of the pickup 1 targeting the address specified by the seek command. Thereafter, operation control necessary for transferring the data in the specified data section to the host computer 80 is performed. That is, data reading / decoding / buffering from the disk 90 is performed, and the requested data is transferred.

In the example of FIG. 13, the disk drive device 70 is connected to the host computer 80. However, the disk drive device of the present invention may be a host computer such as an audio CD player or a CD recorder. There may be a form that is not connected to the computer 80 or the like. In that case, an operation unit and a display unit are provided,
The configuration of the interface part for data input / output is shown in FIG.
Will be different. That is, recording and reproduction are performed in accordance with the operation of the user, and a terminal unit for inputting and outputting audio data may be formed. Further, the display unit may be configured to display the track number and time (absolute address or relative address) during recording / reproduction.

Of course, various other configuration examples are conceivable, such as a recording-only device and a reproduction-only device.

7. Processing Example of First Disk Drive Device A processing example of the first disk drive device will be described. It should be noted that the configurations of FIG. 13 can be applied to all of the first to third disk drive examples. The first here
The processing example of the disk drive device described above is a processing example performed by the disk drive device corresponding to the subcode of the first disk example. Similarly, processing examples of the second and third disk drive devices described later are processing examples corresponding to the subcodes of the second and third disk examples.

FIG. 14 shows a flowchart of a process for determining the disc type (or area type) of the loaded disc 90 as a process example of the first disc drive device. Each flowchart chart described below is an example of processing performed by the system controller 10.

The disc type or the area type can be determined by taking in at least one sub-coding frame from the disk 90, and can be performed at various points. For example, disk 90
Can be read at any time, such as when reading the TOC information of the disc 90, during reproduction, or when accessing, etc. That is, since the subcode is recorded on the entire disk, it can be executed whenever it is necessary to determine the type of the recording density.

In the discrimination processing of FIG. 14, the system controller 10 first takes in at least one sub-coding frame as step F101. Then, in steps F102 and F103, it is determined whether the bit 7 of “second” is “1” or the bit 7 of “frame” is “1”. As described above, in the first disk example, if at least one of bit 7 of “second” and bit 7 of “frame” is “1”, it indicates a high-density disk (or high-density area). Therefore, in such a case, the process proceeds to step F105, and various mode settings corresponding to high-density print data are performed. If both bit 7 of “second” and bit 7 of “frame” are “0”, it indicates a standard disc (or standard density area), and the process proceeds to step F104, where Make various mode settings corresponding to the recording data.

When recording / reproducing standard-density data and recording / reproducing high-density data, it is necessary to change the mode at a required location. Specific examples include setting the RF gain and equalizing characteristics of the RF amplifier 9, various servo gains such as focusing and tracking, and setting of operation coefficients at the time of seek due to different track pitches. It is necessary to switch between and. The mode setting in steps F105 and F104 is processing for setting these according to high-density data or standard density data.

According to such a determination process, the system controller 10 can accurately determine the recording density at a necessary point in time, and can set the mode in accordance with the determined recording density. Operation can be realized. In particular, since it is based on subcode detection, it can be determined even when the pickup 1 is tracing any position on the disk 90. This also means that the standard density / high density can be determined without accessing a specific area on the disc such as the TOC area, and the mode of the reproduction system can be set in accordance with the determination. In other words, it is not necessary to access a specific area without knowing the disc type, and this does not lead to malfunction or runaway due to mismatch between the disc type and playback mode when accessing. Also.

Next, an address decoding process will be described with reference to FIG. 15 as a processing example of the first disk drive device.
At the time of reproduction, TOC read, or the like, the system controller 10 recognizes the address (minute / second / frame) indicated each time a subcoding frame is fetched from the decoder 12. That is, an absolute address by AMIN, ASEC, AFRAME, a relative address by MIN, SEC, FRAME,
The pointers as PMIN, PSEC, and PFRAME are recognized at each point in time and used for various processes such as recognition of an address being reproduced, time display, and access control. FIG. 15 shows that each time a sub-coding frame is captured, the address (minute / second / frame) indicated in the sub-coding frame is recognized and output to another processing system for use in the above-described various processes. Processing.

First, in step F201, the system controller 10 branches the processing according to the high density / standard density. For this determination, the processing shown in FIG. 14 may be performed at the time of step F201, or if the processing in FIG. 14 has already been performed and the recording density information is known (the mode has been set). The processing may be branched based on the mode setting.

In the case of the standard density, the system controller 10 determines in steps F204, F205, and F206
Each of 8 bits of “minute”, “second” and “frame” is B
Recognize as a CD code, and obtain the values of "minute", "second", and "frame". Then, in step F216, the values of "minute", "second", and "frame" are output as address data.

In the case of high density, first, step F202
Then, bit 7 of “second” is confirmed, and if bit 7 = “0”, it is determined that the address extension value = + 100 minutes (see FIG. 7). Then, in step F207, 8 bits of “minute” are recognized as a BCD code to obtain a value, and 1
By adding 00 minutes, a value of "minute" as address data is obtained. Subsequently, in step F208, the 8 bits of “second” are recognized as a BCD code, and the value is set as the value of “second” as address data. Further, Step F209
First, after setting bit 7 of the 8 bits of the “frame” to “0” (in this case, bit 7 = “1”), the 8 bits are recognized as a BCD code, and Let the value be the value of "frame" as address data. The values of "minute", "second", and "frame" obtained in this way are output as address data in step F216.

In step F202, bit 7 of “second” =
If "1" is detected, the bit 7 of "frame" is checked in step F203, and if bit 7 = "1", it is determined that the address extension value = + 0 minutes (see FIG. 7).
Then, in step F210, the 8 bits of “minute” are
It is recognized as a code and the value of "minute" is obtained as address data. In step F211, first, bit 7 of “second” is set to “0” (in this case, bit 7 = “1”).
), The eight bits of “second” are recognized as a BCD code, and the value is used as the value of “second” as address data. Further, in step F212, after setting bit 7 of “frame” to “0” (in this case, bit 7 =
"1"), the eight bits are recognized as a BCD code, and the value is used as the value of "frame" as address data. And the "minute" obtained in this way
The values of “second” and “frame” are output as address data in step F216.

If bit 7 of “frame” is detected as “0” in step F203, the address extension value = + 2
It is determined to be 00 minutes (see FIG. 7). And step F21
In step 3, the value is obtained by recognizing the 8 bits of "minute" as a BCD code, and then adding 200 minutes to the value to obtain the value of "minute" as address data. Step F214
First, after setting bit 7 of “second” to “0” (in this case, bit 7 = “1”), 8 bits of “second” are recognized as a BCD code, and the value is determined. The value of “second” is used as address data. Step F21
In step 2, the 8 bits of the "frame" are recognized as a BCD code, and the value is recognized as the "frame" as address data.
Value. And the "minutes" and "seconds" obtained in this way
The value of "frame" is output as address data in step F216.

By performing the processing as described above, in the case of a standard disk (standard density area), address data in the range of 0 minutes 0 seconds 0 frames to 99 minutes 59 seconds 74 frames is output. In the case of a high-density disk (high-density area), address data in the range of 0 minutes 0 seconds 0 frames to 299 minutes 59 seconds 74 frames is output. That is, address decoding can be realized in response to the extension of the address in the high-density disk or high-density area, and the address can be accurately extracted with compatibility according to the disk type or the area type.

8. Processing Example of Second Disk Drive Device Next, a processing example of the second disk drive device will be described.
FIG. 16 shows a processing example of the second disk drive device.
The flowchart of the process which determines the disk type (or area type) of the loaded disk 90 is shown. As in the processing example of the first disk drive device, determination of the disk type or the area type can be performed by capturing at least one subcoding frame from the disk 90, and can be performed at various times. .

In the discrimination processing of FIG. 16, the system controller 10 first takes in at least one sub-coding frame as step F301. Then, in a step F302, it is determined whether or not the bit 7 of the “frame” is “1”. As described above, in the second disk example, if bit 7 of “frame” is “1”, it indicates a high-density disk (or high-density area). Then, various mode settings corresponding to high-density recording data are performed. If the bit 7 of the “frame” is “0”, which indicates a standard disc (or a standard density area), the flow advances to step F303 to set various modes corresponding to the standard density recording data. Do. Step F30
3 and F304 are set in step F10 in FIG.
5, the processing described in F104.

By such a determination process, the system controller 10 can accurately determine the recording density at a necessary point in time and can set the mode in accordance with the determined recording density. Therefore, accurate recording and reproduction can be performed according to the disc type or area type. Operation can be realized. In particular, since it is based on subcode detection, it can be determined even when the pickup 1 is tracing any position on the disk 90. Of course, as in the case of the above-described first processing example, it is not necessary to access the specific area for the determination, and there is no possibility of malfunction or runaway.

Next, an address decoding process will be described with reference to FIG. 17 as a processing example of the second disk drive device.
This is a process of recognizing an address (minute / second / frame) indicated therein every time a sub-coding frame is captured, and outputting the address for a predetermined process, as in FIG.

First, in step F401, the system controller 10 branches the processing according to the high density / standard density. This is the same as step F201 in FIG.

In the case of the standard density, the system controller 10 determines in steps F403, F404, and F405
Each of 8 bits of “minute”, “second” and “frame” is B
Recognize as a CD code, and obtain the values of "minute", "second", and "frame". In step F412, the values of "minute", "second", and "frame" are output as address data.

In the case of high density, first, step F402
Then, the bit 7 of “second” is confirmed, and if bit 7 = “0”, it is determined that the address extension value = + 100 minutes (see FIG. 9). In step F406, 8 bits of “minute” are recognized as a BCD code to obtain a value.
By adding 00 minutes, a value of "minute" as address data is obtained. Subsequently, in step F407, the 8 bits of “second” are recognized as a BCD code, and the value is set as the value of “second” as address data. Further, Step F408
First, after setting bit 7 of the 8 bits of the “frame” to “0” (in this case, bit 7 = “1”), the 8 bits are recognized as a BCD code, and Let the value be the value of "frame" as address data. The values of "minute", "second", and "frame" obtained in this way are output as address data in step F412.

In step F402, bit 7 of “second” =
If “1” is detected, in step F409,
The eight bits of "minute" are recognized as a BCD code to obtain the value of "minute" as address data. Step F4
In 10, first, bit 7 of “second” is set to “0” (in this case, bit 7 = “1”), and then 8 of “second” is set.
The bit is recognized as a BCD code, and the value is used as the value of “second” as address data. Step F
At 411, after setting bit 7 of “frame” to “0” (in this case, bit 7 = “1”),
The bit is recognized as a BCD code, and the value is used as the value of “frame” as address data. The values of "minute", "second", and "frame" obtained in this way are output as address data in step F412.

By performing the processing as described above, in the case of a standard disc (standard density area), address data in the range of 0 minutes 0 seconds 0 frames to 99 minutes 59 seconds 74 frames is output. In the case of a high-density disk (high-density area), address data in the range of 0 minutes 0 seconds 0 frames to 199 minutes 59 seconds 74 frames is output. That is, address decoding can be realized in response to the extension of the address in the high-density disk or high-density area, and the address can be accurately extracted with compatibility according to the disk type or the area type.

9. Processing Example of Third Disk Drive Device Next, a processing example of the third disk drive device will be described.
As described above, in the third disk example, the address expression range is extended by using the upper 4 bits of the 8 bits of the “minute” and selectively using the 8-bit expression of the minute for the BCD code and the binary code. (See FIG. 11).
For the recording density information, the method of the first or second disk example may be used (however, the recording density may not be provided, or the recording density may be expressed by another method). Therefore, description of the disc type (or area type) discriminating process as a process example of the third disc drive device is omitted (that is, FIG. 14 or FIG. 16 or another example may be performed). .

An address decoding process as a process example of the third disk drive will be described with reference to FIG. This is a process of recognizing the address (minute / second / frame) indicated therein every time a subcoding frame is taken in and outputting it for a predetermined process, as in FIGS.

First, in step F501, the system controller 10 determines whether or not the value of the upper 4 bits M1 in the 8-bit “minute” is equal to or larger than “A (= 1010)”. When the “minute” of the address data is “0” to “99” in the standard density disk or the high density disk, the value of the upper 4 bits M1 is “9” or less. In this case, in steps F502, F503, and F504, the system controller 10 recognizes each of the 8 bits of “minute”, “second”, and “frame” as a BCD code, and determines the values of “minute”, “second”, and “frame”. obtain. In step F508, the values of "minute", "second", and "frame" are output as address data.

The value of the upper 4 bits M1 of “minute” is “A (=
1010) ”or more, the 8 bits of the“ minute ”are a binary code (see FIG. 11). Thus, in step F505, the value is obtained by recognizing the 8 bits of "minute" as a binary code, and then subtracting 60 minutes from the value to obtain the value of "minute" as address data. Subsequently, in step F506, the 8 bits of “second” are recognized as a BCD code, and the value is set as the value of “second” as address data. Further, in step F507, the 8 bits of “frame” are recognized as a BCD code, and the value is set as the value of “frame” as address data. Then, the values of "minute", "second" and "frame" obtained in this way are
In step F508, the data is output as address data.

Note that bit 7 of “second” or “frame”
Is used as the recording density information, in step F506 or F507, the bit 7 is set to "0" and then recognized as a BCD code.

By performing the processing as described above, in the case of a standard disc (standard density area), address data in the range of 0 minutes 0 seconds 0 frames to 99 minutes 59 seconds 74 frames is output. In the case of a high-density disk (high-density area), address data in the range of 0 minutes 0 seconds 0 frames to 195 minutes 59 seconds 74 frames is output. That is, address decoding can be realized in response to the extension of the address in the high-density disk or high-density area, and the address can be accurately extracted with compatibility according to the disk type or the area type.

[0107]

As can be seen from the above description, according to the present invention, the expression range as an address value can be sufficiently extended by using minute information, second information, and frame information in subcodes as a disk recording medium of CD format. .
In addition, the address range (specifically, 0 minutes 0 seconds 0 frame to 99 minutes 59 seconds 74 frames) on the standard disk is the same address format (8-bit BCD) as before.
Can be maintained. Therefore, even if a high-density disk is a disk having twice or three times the capacity of a standard disk, address expression can be sufficiently performed while maintaining compatibility with the standard disk, and appropriate and practical There is an effect that a high-density disk can be realized. In the corresponding disk drive device of the present invention, an address is extracted in accordance with the extended address expression format, so that appropriate operation processing using the address (for example, display of recording / reproduction time) can be performed even on a high-density disk. , Address detection during recording / reproduction / access, etc.). In addition, since the extended address range is expressed only with the minute information, the second information, and the frame information, the address decoding process does not become complicated.

Further, in the disk recording medium of the present invention, since the recording density information (that is, the disk type or the area type) is expressed in the minute information, the second information, and the frame information, a special disc for distinguishing a standard disc from a high density disc is used. There is no need to prepare a special bit, which is preferable for maintaining compatibility. The disc drive unit can accurately determine the disc type and the type of the recording / reproducing area from the minute information, second information, and frame information of the subcode of the loaded disc, and can accurately set processing such as necessary mode setting. Can be executed. Furthermore, the representation of the disc type or area type on the subcode means that the disc type or area type can be determined regardless of where the subcode is read on the disc, and the processing for discrimination is quick and simple. In addition, since there is no need to access a specific area such as TOC, the possibility of malfunction or the like can be eliminated.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a disc type according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a frame structure of the disk of the embodiment.

FIG. 3 is an explanatory diagram of a sub-coding frame of the disc according to the embodiment;

FIG. 4 is an explanatory diagram of sub-Q data of the disk according to the embodiment;

FIG. 5 is an explanatory diagram of a TOC structure of the disk of the embodiment.

FIG. 6 is an explanatory diagram of a disk address value according to the embodiment;

FIG. 7 is an explanatory diagram of an address extension form of the first disc example of the embodiment;

FIG. 8 is an explanatory diagram of an address value of a first disk according to the embodiment.

FIG. 9 is an explanatory diagram of an address extension form of a second disc example according to the embodiment;

FIG. 10 is an explanatory diagram of an address value of a second disk according to the embodiment.

FIG. 11 is an explanatory diagram of an address extension form of a third disc example of the embodiment;

FIG. 12 is an explanatory diagram of an address value of a third disk according to the embodiment.

FIG. 13 is a block diagram of a disk drive device according to an embodiment of the present invention.

FIG. 14 is a flowchart of a type discriminating process of the first disk drive of the embodiment.

FIG. 15 is a flowchart of an address decoding process of the first disk drive device of the embodiment.

FIG. 16 is a flowchart of a type discriminating process of the second disk drive device according to the embodiment.

FIG. 17 is a flowchart of an address decoding process of the second disk drive device according to the embodiment.

FIG. 18 is a flowchart of an address decoding process of the third disk drive device according to the embodiment.

[Explanation of symbols]

1 pickup, 2 objective lens, 2 biaxial mechanism, 4
Laser diode, 5 photo detector, 6 spindle motor, 8 thread mechanism, 9 RF amplifier, 1
0 system controller, 12 decoder, 13 interface unit, 14 servo processor, 20 cache memory, 70 disk drive device, 80
Host computer, 90 disks

Claims (10)

[Claims] 1. A CD-format disc recording medium in which at least address information is recorded as a subcode, wherein the address information is represented by a BCD code value as 8-bit minute information, second information, and frame information. A disk recording medium characterized in that recording density information and address extension information are expressed using two bits, the most significant bit of second information and the most significant bit of the frame information. 2. Four values are represented by two bits, the most significant bit of the second information and the most significant bit of the frame information, and each value is represented by a first recording density and a second recording density. And a second density corresponding to the address extension value a, and a second density corresponding to the address extension value b. 2. The disk recording medium according to 1. However, a ≠ b. 3. A value of one of two bits, a most significant bit of the second information and a most significant bit of the frame information, represents whether the value is a first recording density or a second recording density. , The value of the other bit is zero for the address extension value,
2. The disk recording medium according to claim 1, wherein the value indicates an address extension value a. 4. A disc recording medium in a CD format in which at least address information is recorded as a subcode, wherein the address information is represented by a BCD code value as 8-bit minute information, second information, and frame information. The value of the upper 4 bits of the minute information is "A" (hexadecimal notation)
In this case, the 8-bit information is stored in the BCD.
A disk recording medium characterized by being represented by an 8-bit code different from a code value. 5. The disk recording medium according to claim 4, wherein the 8-bit code different from the BCD code value is a binary code. 6. At least address information is recorded as a subcode, and the address information is recorded on a CD-format disk recording medium represented by BCD code values as 8-bit minute information, second information, and frame information. In a disk drive device capable of performing a recording or reproducing operation, of a subcode read from a loaded disk recording medium, the most significant bit of the second information and the most significant bit of the frame information A control unit that obtains recording density information and address extension information on the disc recording medium from the detection values of the three bits, and performs a setting process according to the recording density information and an address detection process using the address extension information. A disk drive device characterized by the above-mentioned. 7. The control means determines a quaternary value based on two bits of a most significant bit of the second information and a most significant bit of the frame information, and determines whether the first recording density is determined based on the value. It is detected whether the second recording density is the address extension value of zero, the second density is the address extension value a, or the second density is the address extension value b. 7. The disk drive device according to claim 6, wherein the setting process and the address detection process are performed based on the detection result. However, a ≠ b. 8. The control unit according to claim 1, wherein the first recording density or the second recording density is determined by a value of one of two bits of a most significant bit of the second information and a most significant bit of the frame information. The value of the other bit is used to detect whether the address extension value is zero minutes or the address extension value a, and based on each detection result, the setting process and the address 7. The disk drive device according to claim 6, wherein a detection process is performed. 9. At least address information is recorded as a subcode, and the address information is a CD format disc recording medium represented by BCD code values as 8-bit minute information, second information, and frame information. In a disk drive device capable of performing a recording or reproducing operation, the value of the upper 4 bits of the minute information in the subcode read from the loaded disk recording medium is “A”.
(Hexadecimal notation) or not, and the "A"
If not, the 8-bit minute information is recognized as a BCD code value to perform an address detection process.
A disk drive device comprising control means for performing address detection processing by recognizing an 8-bit code value different from a CD code value. 10. The disk drive according to claim 9, wherein the 8-bit code different from the BCD code value is a binary code.