JPH117729A - Partial rom disk and method and apparatus for recording reproducing data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize high-speed access to a ROM area and a RAM area without accompanying a seek to an optical head, by providing an information-recording track extended in the circumference of the center of a disk recording medium, an information reproduction recording area on the track and an information record reproduction area continuous with the recording area. SOLUTION: Recording tracks Tr1-Trm, ROM areas Aro exclusive for reproduction, address areas Aad and RAM areas Ara that can be recorded and reproduced are continuously repeatedly provided in parallel to a scan direction Da. The areas Aro, Aad and Ara are formed at wind parts of the tracks. A partial record area APR is thus constituted. A bit mark Mro is formed at the ROM area Aro, and a bit mark Mra in a crystal state and an amorphous state is formed at the RAM area Ara with the utilization of a phase change of a recording film. A guide groove Gg is formed every other rounds to the wind part of the track Tr at the RAM area Ara to let laser beams trace the track Tr. Accordingly, data can be recorded to both a land and a groove track formed by one guide groove Gg.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk having a ROM area exclusively for data reproduction and a RAM area for data recording / reproduction.
A partial ROM disk in which the M area and the RAM area are mixed, and a video,
The present invention relates to a method and apparatus for simultaneously recording and reproducing voice and control data.

[0002]

2. Description of the Related Art In recent years, because of the ease of random access, portability, and high reliability of recording / reproducing data, recording / reproducing of large-capacity video data, audio data, MIDI data, and control data in various devices has been advanced. Optical disks are used. Optical disks are generally classified into three types from the viewpoint of data recording. That is, a ROM disk that is a read-only medium, a RAM disk that is a rewritable recording / reproduction medium, and a WORM disk that is a write-once recording / reproduction medium that can be recorded only once.

[0003] In a ROM disk, information is generally recorded by pits having irregularities on the disk, so that data cannot be rewritten. However, R
The OM disk can be mass-produced in a short time by a press method using a stamper, and thus is suitable for mass distribution of large-volume data such as AV data of movies and music and computer software. On the other hand, R
AM disks are not suitable for mass duplication, but data can be erased and overwritten as many times as possible by utilizing the difference in reflectivity due to the phase change of the recording film material. ing. Further, WORM discs generally use a chemical change of a dye recording film for data recording, so that once recorded data cannot be erased or overwritten, it is suitable for backup recording of large-capacity data. Further, in recent years, by providing a read-only area and a recording / playback area simultaneously on one optical disc, RO
A partial ROM disk, which is a hybrid recording / reproducing disk having both features of the M disk and the RAM disk, has been developed.

FIG. 15 shows a typical example of a partial ROM disk. A recording track on a partial ROM disk is formed of a plurality of zones Z1 to Z on a concentric circle in a radial direction according to a ZCLV (Zone Constant Linear Velocity) method.
n. n is a natural number, and FIG. 7 shows a case where n = 6 for simplification, that is, a case where there are six zones Z1 to Z6. The boundary between the zones is indicated by broken lines.

In a conventional partial ROM disc, several zones (Z) on the inner peripheral side of these plural (n) zones are used.
1 to Z3), a ROM area Aro dedicated to data reproduction specific to the above-mentioned ROM disk is provided. On the other hand, in several zones (Z4 to Z6) on the outer peripheral side, a RAM area Ara capable of recording data unique to the RAM disk is provided. That is, the partial ROM disk Z1 to Z6
The ROM area Aro and the RAM area Ara, each of which includes three continuous zones, are separated from each other in the radial direction.

A read-only recording track Tro is formed in the ROM area Aro, and a recording track Tra for both recording and reproduction is continuously formed spirally in the RAM area Ara. In FIG. 15, for the sake of simplicity, the recording tracks Tro located at the innermost periphery and the outermost periphery of the ROM area Aro respectively correspond to the recording tracks Troi and Z3 located at the innermost periphery in the zone Z1. Are indicated by solid lines as recording tracks Troo located at the outermost peripheral portion. Furthermore, the recording tracks Tra at the innermost and outermost parts of the RAM area Ara are respectively the recording track Trai at the innermost part in the zone Z4 and the recording track Trao at the outermost part of the zone Z6. Are partially indicated by solid lines. Needless to say, the recording tracks Tr are provided in the entire area of each zone.
In this example, the recording track Tr is wound in the clockwise direction Da, but may be wound in the counterclockwise direction. Note that the optical head scans the recording track Tr along the winding direction of the recording track Tr.

In the ZCLV system, the linear velocity at which the optical head scans the recording track can be kept within a constant range over the entire area of the optical disk by changing the disk rotation speed for each zone. Since the disk rotation speed is constant in the same zone, the linear velocity at the outer periphery of the zone is
Although it is faster than the linear velocity at the inner periphery, there is no problem because this velocity difference is within the allowable range. That is, the linear velocity of the optical head with respect to the track is substantially constant regardless of the radial position on the optical disk.

An advantage of the ZCLV method is that the CLV (Co
Since there is no need to continuously change the rotation speed of the optical disk as in the case of the nstant linear velocity (velocity) method, the motor control can be easily performed. Further, when the recording characteristics of the recording layer of the optical disc depend on the linear velocity, a stable recording characteristic can be obtained over the entire recording track.

[0009]

However, for example, when a user records video data B in the RAM area Ara while reproducing video data A recorded in advance in the ROM area Aro, the optical head uses the ROM area A.
After reading a predetermined amount of the video data A recorded in the ro, a seek operation for moving the optical head in the radial direction from the inner circumference to the outer circumference of the optical disk is required. This seek distance Ds is the shortest distance between the outermost track Troo of the ROM area Aro and the innermost track Trai of the RAM area Ara, that is, the distance Dt between one track.
It is. The longest is the innermost track T of the ROM area Aro.
roi and outermost peripheral track Trao of RAM area Ara
The effective recording area radius distance Dr. The optical element required for the optical head of the optical disk recording / reproducing device is much heavier than the magnetic element, so the optical head itself has a larger mass than the magnetic head used in the magnetic recording / reproducing device and the like. ing. As a result, the seek time Ts for the optical head to move the seek distance Ds is ten and several times larger than when the magnetic head of the hard disk as the magnetic recording / reproducing device moves the same distance.

In an optical disk, the optical head moves at a substantially constant linear velocity with respect to the recording tracks Tra and Tro.
(constant linear velocity) In order to access by CLV, it is necessary to adjust the rotation of the optical disk to a predetermined rotation speed determined for each zone to which the optical head belongs in accordance with the position of the optical head on the radius of the optical disk. There is.
For this purpose, a rotation stabilization time Tc for stabilizing the rotation speed of a rotating system including a motor rotating at a high speed to a predetermined speed.
Cost.

Further, Tw is a sector waiting time from when the optical head reaches a target track of the optical disk rotating at a predetermined rotation speed until when a sector to which data is written comes below the head. . The minimum value of the sector waiting time Tw is substantially zero, and the maximum value is 1 / C when the rotation speed of the optical disk is Crpm.

After the optical head reproduces predetermined data from the ROM area, the optical head moves to the RAM area only once, and the recording and reproduction time TRW required for recording the predetermined data is determined by the seek time Ts and the rotation stabilization. This is the sum of the time Tc and the sector waiting time Tw. As a guide for the recording / reproducing time TRW, comparing the average seek time, the hard disk drive takes less than 10 ms, while the optical disk drive takes about 100 ms.

Therefore, in order to record the video data B in the RAM area while reproducing the video data A from the ROM area without interruption, the video data A read out before the seek of the optical head must be performed within the reproduction time of the video data A. The optical head must be moved back and forth between the two areas. In this case, the round trip time is approximately 2Trw. That is, the ROM area Ar
In order to simultaneously perform recording and reproduction without interruption on a partial ROM having a RAM area Ara and a RAM area Ara separated by a radius method, a large-capacity semiconductor memory corresponding to at least 2Trw time is required for buffering. . Further, processing of the large-capacity video data results in degraded performance of the optical disk recording / reproducing apparatus. In other words, when handling large-capacity, high-transfer-rate, and continuously input / output data such as video data, the optical head movement time 2Trw
As the capacity of the semiconductor memory for buffering data corresponding to increases, the processing of such large-capacity video data within the buffering time leads to an increase in cost as a device. .

[0014]

According to the present invention, as a means for solving the above-mentioned problems, there is provided a recording track for recording information extending around a center and an information provided on the recording track. An optical disc recording medium having a first recording area used for reproduction, and a second recording area used for recording and reproduction of information provided continuously to the first recording area on the recording track; Recording / reproducing means for scanning the first recording area and the second recording area to generate a reproduction signal; and recording means for scanning the second recording area to record a recording signal. An apparatus and a recording / reproducing method characterized by generating a reproduction signal by scanning the first recording area and the second recording area, and recording the recording signal by scanning the second recording area. is there.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a partial ROM disc according to an embodiment of the present invention; FIG. 2 is a diagram showing the structure of a recording surface of the partial ROM disc; The configuration and operation will be described. In the partial ROM according to the embodiment of the present invention, similarly to the representative partial ROM shown in FIG.
Zones are divided into concentric circles in the radial direction based on the V method, and recording tracks Tr are provided in the entire area of each zone. However, in the present invention, unlike the conventional partial ROM disc, the ROM is stored in each zone.
Instead of providing only the area Aro or the RAM area Ara, the ROM area Ar is provided inside the recording track Tr.
o and both the RAM area Ara. Furthermore, the zones Z1 to Zn are divided into two groups in the radial direction, and each zone group is divided into the ROM area Ar.
o or the RAM area Ara alone. The structure inside the recording track Tr will be described later in detail with reference to FIG.

FIG. 1 shows a recording track Tr in one zone of a recording surface of a partial ROM disc PRD according to the present invention.
Is shown in an enlarged manner. FIG. 1 schematically shows a state in which a recording track Tr is wound m times (m is a natural number) from the inner circumference to the outer circumference. For convenience, the recording track T
r is wound along tracks Tr1, Tr2, Tr3, Tr4, Tr5, Tr along the scanning direction Da of the optical head.
6, and Trm. Each winding portion of the recording track Tr includes a ROM area Aro, an address area Aad, and an RA area.
The M area Ara is provided continuously and repeatedly, and the partial recording area APR is configured repeatedly. That is, one unit of the partial recording area APR includes one continuous ROM area Aro, one address area Aad, and one RAM area Ara.

In the read-only ROM area Aro, bit marks Mro are formed by providing pits on the mirror-like recording surface (land portion) of the disk, and the recordable / reproducible RAM area Ara is a phase change of the recording film. The bit mark Mra is formed by a crystalline state and an amorphous state using the above.

In the RAM area Ara, guide grooves Gg for the laser beam emitted from the optical head to follow the recording track Tr are formed every other turn in the winding part of the recording track Tr. The recording track Tr in which the bit mark Mra is formed in the concave portion of the guide groove Gg is called a groove track. A recording track Tr on which a bit mark Mra is formed on a convex portion where the guide groove Gg is not formed
Is called a land track.

In FIG. 1, recording tracks Tr1, T
r3, Tr5 and Trm are groove tracks,
Recording Tr2, Tr4, Tr6, Trm-1, and Trm
+1 is a land track. That is, in the partial recording area APR of one unit, if the RAM area Ara is a groove track, the partial recording area APR itself including the ROM area Aro and the address area Aad is set as the groove track. Similarly, RAM
If the area Ara is a land track, the unitary partial recording area APR itself is set as a land track.
It is preferable that the recording track Tr has a single turn corresponding to one circumference of the disk, and is formed of a group track or a land track. However, a groove track and a land track are mixed in one turn. You may comprise so that it may make it.

As described above, since data can be recorded on both the land track and the groove track formed by one guide groove Gg, the use efficiency of the recording surface of the optical disk is not impaired. Originally, when bit marks were recorded on both adjacent land tracks and groove tracks, crosstalk generated between reproduced bit signals was large and not practical. However, in the present invention, by optimizing the depth of the guide groove Gg, the crosstalk is reduced, and recording on adjacent lands and groove tracks is enabled. Although the optimum depth Dg of the guide groove Gg is determined by various conditions, the laser wavelength λ
Can be theoretically expressed by Dg = λ / 6.
Needless to say, there are various differences depending on the type of laser, the optical characteristics of the apparatus, and the like other than the laser wavelength. Compared to the case where recording / reproducing is performed only on one of the groove track and the land group,
It can record at twice the density.

In the address area Aad formed between the RAM area Ara and the ROM area Aro, the address information of the track to which the partial recording area APR belongs is stored in the form of a bit formed by pits and lands as in the ROM area Aro. It is recorded as a mark Mad.
If necessary, the address area Aad may record the sector of each area of the partial recording area APR, and the track and sector information of the entire disk. That is, the address area Aad is also a sector ID. In the recording track Trm, the bit mark Mad includes two pit groups Pa (m) that are continuous in the access direction Da.
-1, m) and the second pit group Pa (m, m + 1). m is a positive integer indicating the recording track Tr.

The pit group Pa (m−1, m) and the second pit group Pa (m, m + 1) are adjacent to the recording track Trm.
It is formed so as to be offset from the -1 and the Trm + 1 by the amount opposite to the track. In other words, the pit group Pa (m-1, m) is shared with the inner adjacent track Trm-1, and the pit group Pa (m-1, m) is
(M, m + 1) is shared with the adjacent track Trm + 1 on the outer peripheral side. For discrimination, the inner track portion of each pit group is represented by Pa (m-1, m) T and Pa (m, m + 1) T.
And the outer track portion is Pa (m-1, m) B and P
a (m, m + 1) B. Recording track T
rm always includes the pit groups Pa (m-1, m) B and P
a (m, m + 1) T, and the pit group Pa (m−1,
m) T and Pa (m, m + 1) B are included in the adjacent tracks Trm-1 and Trm + 1, respectively. FIG.
As described in FIG. 5, the example in which the recording track Trm is formed by being spirally wound has been described, but the recording track may be formed in a concentric shape.

FIG. 2 shows recording tracks Trm and Trm in the partial recording area APR thus configured.
The reproduction signal from the pit group Pa when +1 is reproduced by the push-pull signal method is schematically shown. Waveform W
p (m-1, m) B is the pit group Pa of the track Trm
(M-1, m) represents a reproduced signal from B, and has a waveform Wp
(M, m + 1) T is the pit group Pa of the track Trm
5 shows a reproduced signal from (m, m + 1) T. Further, the waveform W
p (m, m + 1) B is the pit group P of the track Trm + 1
a (m, m + 1) B indicates a reproduced signal from a waveform Wp
(M + 1, m + 2) T is the pit group P of the track Tm + 1
5 shows a reproduction signal from a (m + 1, m + 2) T.

The waveform Wp (m, m + 1) T and the waveform Wp
(M, m + 1) B are the same pit group Pa
Since the signals are reproduced from the inner and outer peripheral portions of (m, m + 1), they have basically the same waveform, but their polarities are different depending on the push-pull method. As described above, since each pit group Pa is shared by the groove track and the land track, even signals reproduced from the same pit group Pa are output with different polarities for each reproduction track. Therefore, the distinction between the land track and the groove track can be easily detected.

The partial recording area APR has a RAM area Ara and an address area Aa in the scanning direction Da.
d and the ROM area Aro may be arranged in this order. Further, an address area Aad may be provided between each partial recording area APR.

As shown in FIG. 3, a partial ROM disc PRD according to the present invention has a cartridge C for preventing the recording surface from being scratched or proud.
It is preferable to use it stored in T. However, if the environment is favorable, a partial ROM disk may be used directly without storing in a cartridge.

The recording surface comprising the partial recording area APR may be provided on both sides of the disk to constitute a double-sided double-layer partial ROM disk, or one or more recording surfaces may be provided on one side of the disk. Needless to say, it can be configured as a single-sided multilayer or double-sided multilayer partial ROM.

Next, a recording / reproducing apparatus used for recording / reproducing a partial ROM disc PRD according to an embodiment of the present invention will be described with reference to FIG. Recording / playback device RW
A denotes a spindle motor unit 2, an optical head 3, preamplifiers 4a, 4b, 4c, 4d, 4e, and 4f, a focus differential amplifier 5, a focus servo control circuit 6, a focus actuator 7, and a tracking differential amplifier 8. , Tracking servo control circuit 9, tracking actuator 10, control circuit 11, RF amplifier 12, A / D conversion circuit 13, demodulation circuit 14, reproduction memory 15, recording memory 16, modulation circuit 17, laser power control circuit 18, laser It comprises a drive circuit 19, an ECC decoder 23, and an ECC encoder 24.

The spindle motor unit 2 holds the partial ROM disc PRD having the partial recording area APR shown in FIG. 1 and also controls the partial ROM disc RPD based on a spindle control signal Sp supplied from the control circuit 11. ZCL for optical head 3
Rotate in V system. The spindle motor unit 2
The rotation of the spindle is detected, and a spindle rotation speed signal So indicating the rotation speed of the spindle is generated. Further, the spindle motor unit 2 includes a partial ROM disc RP
The rotation of D is detected, and a disk one rotation signal Sn indicating one rotation of the disk is generated. The control circuit 11 generates a spindle control signal Sp based on the spindle speed signal So and the disk 1 rotation signal Sn.

The optical head 3 reads and writes data from and to the partial ROM disc PRD. The optical head 3 is controlled by the focus actuator 7 and the tracking actuator 10 so as to correctly trace a predetermined track of the partial ROM disc RPD. Incidentally, the spindle motor unit 2,
The focus actuator 7, the tracking actuator 10, and the optical head 3 constitute a head unit 30 that reads and writes data on a predetermined recording track Tr of the partial ROM disc PRD.

First, the reproducing system of the recording / reproducing apparatus RWA will be described, and then the recording system will be described. In the reproduction system, the reproduction signal Sr read from the partial ROM by the optical head 3 is converted into reproduction signals Sr1, Sr2, Sr3,
Divided into Sr4, Sr5, and Sr6,
Output to the preamplifiers 4a, 4b, 4c, 4d, 4e, and 4f.

The reproduced signals Sr1 and Sr2 amplified by the preamplifiers 4a and 4b are output to the focus differential amplifier 5. The focus differential amplifier 5 outputs the reproduction signal S
A focus error signal is generated based on r1 and Sr2 and output to the focus servo control circuit 6. The focus servo control circuit 6 generates a focus control signal SFc based on the input focus error signal, and outputs it to the focus actuator 7. The focus actuator 7 outputs a focus control signal SFc
, The position control of the optical head 3 in the focus direction is performed.

Similarly, the reproduced signals Sr3, Sr4, Sr5 amplified by the preamplifiers 4c, 4d, 4e and 4f,
And Sr6 are transferred to the tracking differential amplifier 8 and the RF amplifier 12. Tracking differential amplifier 8
Generates a tracking error signal Sj based on the push-pull method based on the reproduction signals Sr3, Sr4, Sr5, and Sr6 and outputs the tracking error signal Sj to the tracking servo control circuit 9 and the A / D conversion circuit 13. The tracking servo control circuit 9 generates a tracking control signal STc based on the input tracking error signal and outputs it to the tracking actuator 10. The tracking actuator 10 receives the tracking control signal ST
Based on c, position control of the optical head 3 in the tracking direction is performed.

The focus servo control circuit 6 and the tracking servo control circuit 9 control the focus servo and tracking servo generated during the reproduction of the ROM area Aro and the reproduction of the RAM area Ara based on the servo switching signal Sh output from the control circuit 11. Correct the gain difference and offset. That is, the data reproduction area is the ROM area Ar
When switching from o to the RAM area Ara or vice versa, the focus servo control circuit 6 and the tracking servo control circuit 9 are controlled in order to compensate for the change in the reproduction signal caused by these gain difference and offset.

That is, when a tracking error signal is generated from the partial recording area APR obtained by the push-pull method, the tracking servo signal obtained from the ROM area Aro in which the bit mark Mro is formed on the mirror surface of the disk is uneven. RA with guide groove Gg
Since the amplitude is much smaller than the tracking servo signal obtained from the M area Ara, gain correction is required. Therefore, it is effective to switch the tracking servo control method for each of the ROM area and the RAM area based on the servo switching signal Sh. That is, a general phase difference detection (heterodyne method) method is used for tracking servo control of the ROM disk for tracking the ROM area Aro, and the above-described push-pull method is used for tracking the address area Aad and the RAM area Ara. .
Note that the servo switching signal Sh is a timing signal indicating when the area of the recording track Tr accessed by the optical head 3 changes from the ROM area Aro to the address area Aad or the RAM area Ara, and vice versa. .
That is, the servo switching signal Sh is transmitted from the optical head 3 to the ROM
The timing of switching between the area Aro and the other areas is shown. The servo switching signal Sh will be described later with reference to FIG.

Further, the bit mark Mad of the address area Aad is located off-track, that is, the pit group Pa
Since (m-1, m) and Pa (m, m + 1) are shared by adjacent tracks, they act as disturbances on the tracking servo. Therefore, the address area Aad
For the tracking servo in the address area A
ROM which is a tracking error signal immediately before entering AD
The last tracking error signal in the area Aro is retained and adopted as a tracking error signal in the address area Aad. The tracking servo control circuit 9 switches the tracking error signal based on the servo switching signal Sh.

The RF amplifier 12 includes preamplifiers 4c,
reproduction signals Sr3, Sr amplified at d, 4e, and 4f
4, RF amplify Sr5 and Sr6. RF amplifier 1
2 is further connected to the control circuit 11 and receives a disk read gate signal Sa instructing reading of data from the partial ROM disk RPD. RF amplifier 12
Outputs a sum signal of the reproduction signals Sr3 to Sr6 to the A / D conversion circuit 13 as a reproduction data signal Sk based on the timing specified by the disk read gate signal Sa.

The A / D conversion circuit 13 is further connected to the tracking differential amplifier 8 to receive the tracking error signal Sj based on the push-pull method, and is connected to the control circuit 11 to input the area switching signal Si. receive.
The area switching signal Si is a timing signal indicating when the area of the recording track Tr accessed by the optical head 3 changes from the ROM area Aro to the address area Aad and the subsequent RAM area Ara. That is, the area switching signal S
i indicates the timing at which the area accessed by the optical head 3 switches between the address area Aad and the other areas. In addition, about the area switching signal Si,
This will be described later with reference to FIG.

FIG. 5 shows a detailed configuration of the A / D conversion circuit 13. The A / D conversion circuit 13 includes the analog switch 2
0, an equalizer 21, and a voltage comparison circuit 22.
The analog switch 20 is connected to the tracking differential amplifier 8, the control circuit 11, and the RF amplifier 12,
Each receives a tracking error signal Sj, an area switching signal Si, and a reproduction data signal Sk.

The analog switch 20 outputs the area switching signal S
Based on i, of the two analog signals Sk and Sj,
One of the signals is selected and output to the equalizer 21. That is, when the address area Aad is reproduced, the push-pull tracking error signal Sj is output, and when the ROM area Aro and the RAM area Ara are reproduced, the reproduced data signal Sk is output as the reproduced data envelope signal SL.

The reason why the address area Aad is reproduced by the push-pull method is that the bit mark Mad
Pit groups Pa (m-1, m) and Pa (m, m + 1)
Are offset from the adjacent track by an amount corresponding to the opposite track, so that when the tracked signal is reproduced, the S / N ratio of the push-pull reproduction signal is improved as compared with a normal sum signal. That's why.

The equalizer 21 performs an equalization process on the reproduced data envelope signal SL composed of the analog signals Sk and Sj selectively output from the A / D conversion circuit 13, and then outputs the same to the voltage comparison circuit 22. The voltage comparison circuit 22 performs a threshold process on the reproduction data envelope signal SL to generate a digital reproduction signal Sd.

Referring now to FIG. 6, voltage comparison circuit 2
2 will be described. The voltage comparison circuit 22 includes a voltage comparator 22a, a subtractor 22b, an integrator 22c, and a buffer 2
2d. The voltage comparator 22a outputs a reproduced data envelope signal SL input from the equalizer 21.
Is compared with a threshold voltage Vm input from the integrator 22c to output a non-inverted digital signal V1 and an inverted digital signal V2. The non-inverted digital signal V1 and the inverted digital signal V2 are both a reproduction envelope signal SL and a threshold voltage V
This signal represents the result of the voltage comparison with m, and has the same absolute value and different polarity.

The subtractor 22b subtracts the non-inverted digital signal V1 from the inverted digital signal V2, and outputs a subtraction signal V
3 is output. The subtraction result signal V3 has the same properties as the digital reproduction signal Sd, but performs a subtraction process to eliminate unnecessary offset values. Since the band of the subtraction result signal V3 is limited by the integrator 22c as described later, it is not necessary to have a wider band than the digital reproduction signal Sd.

The integrator 22c integrates the subtraction result signal V3, generates a threshold voltage Vm, and supplies it to the voltage comparator 22a. The subtraction result signal V3 is output positive when the threshold voltage Vm is low with respect to the center of the envelope of the digital reproduction signal Sd, and is negative when the threshold voltage Vm is high with respect to the center of the envelope of the digital reproduction signal Sd. Is output. That is, the threshold voltage Vm is equal to the digital reproduction signal Sd.
The feedback control is performed so that the center of the envelope of (2) becomes (the output of the subtractor is zero).

The buffer 22d outputs a digital reproduction signal Sd based on the above-described feedback-controlled non-inverted digital signal V1 and inverted digital signal V2.

The configuration of the voltage comparison circuit 22 suitable for code reproduction in which the reproduction signal does not include a DC component has been described above. The voltage comparison circuit 22 is adapted to be suitable for code reproduction in which the reproduction signal includes a DC component. It is easy to retrofit.

Referring to FIG. 7, the threshold processing by voltage comparison circuit 22 will be described. The upper part of the figure shows the partial recording area APR of the recording track Trm shown in FIG.
The middle stage shows the reproduction data envelope signal SL output from the equalizer 21 multiplied by the threshold voltage Vm set inside the voltage comparison circuit 22, and the lower stage shows the control circuit 11
Switching signal Si and servo switching signal S output from
h.

The reproduced data envelope signal SL includes R
Along with the difference in the offset value due to the difference in reflectance between the OM area Aro and the RAM area Ara, the bit mark Mro formed by the unevenness of the recording surface and the bit mark Mra formed by the different phase state on the recording surface are used. There is a difference in signal amplitude. On the other hand, the threshold voltage Vm is feedback-controlled by the voltage comparison circuit 22 so as to always slice the center of the envelope of the reproduction signal SL as described above.

The area switching signal Si is supplied to the head unit 30
The area of the recording track Tr being scanned by the optical head 3 is detected on the basis of the reproduction signal (Sk) from the CPU, and is at a high level during scanning of the address area Aad, and at a low level during scanning of other areas. This is a binary signal to be set. That is, it can be said that the signal is an address area Aad detection signal that extracts only a period during which the optical head 3 scans the address area Aad.

The servo switching signal Sh is the area switching signal Si
Is a binary signal that is set to a high level while the optical head 3 is scanning the ROM area Aro, and is set to a low level while scanning the other areas. That is, R which extracts only the period during which the optical head 3 scans the ROM area Aro
It can also be called an OM area Aro detection signal.

The area switching signal Si and the area switching signal S
Regarding the generation of i, at the time of switching of the important scanning area,
The methods described below can be used alone or in combination.

That is, the RO of the partial recording area APR
M area Aro, address area Aad, and RAM area A
By detecting the edge of the reproduction data (Sd) in the reproduction signal (Sk) from each region of ra, the switching of the region is detected. Also, based on the address information (Sq) included in the reproduction signal (Sk), the reproduction data (Sk)
The switching of the area is detected without detecting the edge of d). Further, address information of the address area Aad and the RAM area Ara is also written in advance in the ROM area Aro, and based on the address information in the ROM area Aro, the address area Aad and the RAM area Ar
The switching of each area including a is detected.

As described above, the equivalent reproduction signal SL output from the equalizer 21 is output to the A
/ D converted to A / D as a digital reproduction signal Sd.
It is output from the conversion circuit 13.

Returning to FIG. 4, the digital reproduction signal Sd output from the A / D conversion circuit 13 is input to the demodulation circuit 14 and demodulated. Of the demodulated digital playback signal,
The address information is stored in the control circuit 11 as address data Sq.
And the portion that does not include address information, ie, RO
The user data recorded in the M area Aro and the RAM area Ara is output to the reproduction memory 15 as digital reproduction data Sdd.

The reproduction memory 15 is connected to the control circuit 11 and receives the reproduction memory write gate signal Sb and the reproduction memory read gate signal Sc. The reproduction memory write gate signal Sb and the reproduction memory read gate signal Sc will be described later with reference to FIG. This will be described with reference to FIG. The digital reproduction data Sdd is stored in the reproduction memory 1 based on a predetermined timing defined by the reproduction memory write gate signal Sb.
5 is written. The digital reproduction data Sdd written in the reproduction memory 15 is based on a predetermined timing defined by the reproduction memory read gate signal Sc,
Is read.

The digital reproduction data Sdd ′ read from the reproduction memory 15 is input to the ECC decoder 23 and subjected to error detection and error correction processing.
The reproduced data SD is output from the output terminal To to the outside. Thus, in the reproducing system of the recording / reproducing device RWA,
By performing a reproduction process by switching the reproduction method according to the ROM area Aro, address area Aad, and RAM area Ara of the partial recording area APR, the data recorded on the partial ROM can be efficiently reproduced,
Output to an external device.

On the other hand, in the recording system, digital source data SS is supplied from an external data source (not shown) to the recording / reproducing device RWA via the input terminal Ti. The digital source data SS is input to the ECC encoder 24 and subjected to error correction processing of adding redundant data for error detection and correction.
Output as Se. The recording memory 16 is further connected to the control circuit 11 so that the recording memory write gate signal S
The recording memory write gate signal Sf and the recording memory read gate signal Sg to which f and the recording memory read gate signal Sg are input will be described later with reference to FIG.

The digital recording data SSe output from the ECC encoder 24 is based on a predetermined timing specified by the recording memory write gate signal Sf.
The data is written to the recording memory 16. The digital recording data SSe written in the recording memory 16 is read out as digital recording data SSe ′ based on a predetermined timing defined by the recording memory read gate signal Sg.

The digital recording data SSe ′ read from the recording memory 16 is modulated by the modulation circuit 17 and then input to the laser power control circuit 18 as a modulation recording signal SSm. In the laser power control circuit 18, the RAM area A of the partial ROM
The optimum laser power for data recording to ra is set, and the laser power control information indicating the set power is multiplied by the modulation recording signal SSm to generate the recording signal Sw. When the RAM area Ara is formed of a phase change recording film, the laser power is set, for example, at a linear velocity of 6 m /
In the case of s, the peak power required for recording is about 10 mW,
The bias power for erasing already recorded data is about 5 mW.

The laser drive circuit 19 drives the laser light source of the optical head 3 with the laser power according to the recording signal Sw based on the disk write gate signal Src supplied from the control circuit 11, and the RAM of the partial ROM disk Data is recorded in the area Ara.

FIG. 8 shows a laser power control circuit 1
8 schematically shows the relationship between the laser emission waveform of the optical head 3 modulated by the laser drive circuit 19 based on the laser power setting by 8 and the bit mark Mra formed on the recording film in the RAM area Ara. The upper part of the figure shows the modulation recording signal SSm, the middle part shows the laser emission waveform WL,
The lower row shows bit marks Mra formed in the RAM area Ara by the laser. In this example, the modulation recording signal SSm has predetermined time lengths L1 and L1.
2 having a two high signal. The laser power control circuit 18 outputs the high periods L1 and L1 of the high signal.
2 is divided into a plurality of predetermined periods, and the laser output is set to the peak level L for each of the divided periods.
P, the bias level LB, and the low level LL are held at any one of the three levels. By changing the time division ratio for each level, the duty ratio of the laser power in the high state times L1 and L2 is adjusted. As a result, the laser power is set according to the modulation recording signal SSm. Peak level LP is partial ROM disc RPD
, The bias level LB indicates the power intensity necessary for erasing the already recorded bit marks, and the low level LL indicates the power intensity required for the presence or absence of the bit marks. It means the power intensity that does not affect the recording surface.

The case where the signal of the high period L1 is recorded in Ara will be briefly described. The period L1a is subdivided into seven periods. The laser waveform WL is the first, third,
And the fifth divisional period holds the peak level LP, the second, fourth, and sixth divisional periods hold the low level LP, and the seventh (last) period sets the bias level LB. . Such setting of the duty ratio is suitable for direct overwrite recording in which a bit mark is formed by a phase change. That is,
Since phase change recording is caused by heat, the laser output near the end of the bit mark is reduced in order to prevent the heat from being trapped near the end of the bit mark on the recording surface and distorting the mark. However, in consideration of a case where another data has already been recorded in this area, the bias level LB is set instead of the low level LP. As a result, bit marks B1 and B2 corresponding to the high signal are formed on the recording surface.

As described above, the recording and reproduction of data on the partial ROM disc according to the embodiment of the present invention have been described. The recording method is not limited to the method using the reflectance difference between the phase change portion and the ratio change portion in the recording layer, but also the method using the magnetic field change of the recording film, and the additional recording using the chemical reaction of the dye film. Needless to say, the present invention can also be applied to the type recording method.

Referring to FIGS. 9, 10 and 11, the configuration of the partial recording area APR of the partial ROM disc PRD in which the data array is divided by sectors will be described. 9, 10 and 11.
In order to improve the visibility, the address area Aa
d is not displayed, but as described above, in the partial recording area APR, the ROM area Aro and the RAM area A
Needless to say, the address area Aad is provided between the ra.

FIG. 9 shows the structure of the minimum unit of the partial recording area APR. In this case, the partial recording area AP
R is composed of two consecutive sectors. That is,
It is composed of a ROM area Aro for one sector and a RAM area Ara for one sector. When one sector of data is recorded in the RAM area for one sector of ROM data, the minimum unit for recording and reproduction is one sector. Note that the address area Aad, which is the sector ID, is included in the RAM area Ara or ROM area Aro for one subsequent sector.

FIG. 10 shows that the partial recording area APR is
An example composed of three consecutive sectors is shown below. The partial recording area APR is composed of one sector ROM area Aro and 2 sectors.
It is composed of a RAM area Ara for sectors. Such a configuration is suitable for an application in which the amount of recordable data is twice as large as the amount of data dedicated to reproduction. Generalizing this example, the partial recording area APR
Is a ROM area Aro of M sectors (M is a natural number) and N
The RAM area Ara of the sector (N is a natural number) can be arranged alternately.

FIG. 11 shows an example similar to the example shown in FIG. 9 but comprising a cluster composed of a plurality of sectors as the minimum unit of the ROM area Aro and the RAM area Ara. For example, if one sector is 2 Kbytes, and 32 Kbytes of 16 sectors are defined as one ECC circuit unit (one cluster), the minimum unit of recording and reproduction is one cluster, and the inside of a cluster is a ROM disk sector and a RAM disk sector. It doesn't make sense to be split. Therefore, the partial recording area APR is configured by alternately arranging the ROM area Aro of the P cluster (P is a natural number) and the RAM area Ara of the Q cluster (Q is a natural number).

FIG. 12 shows an angle division type partial ROM which is an example of the partial ROM according to the embodiment of the present invention. The angle division type partial ROM disk is such that the recording surface of the disk is divided into a plurality of fan-shaped regions at a predetermined central angle, and the above-described R
By providing the OM area Aro, the address area Aad (not shown), and the RAM area Ara, it means a disk in which the partial recording area APR is formed in a predetermined pattern. The recording surface of the angle division type partial ROM disk PRDA according to the present example has a predetermined center angle CA1, CA
2, CA3 and CA4, the sections S1, S
It is divided into four parts, 2, S3 and S4.

The section S1 includes a first ROM area Ar
o1 has a first RAM area Ara1 in section S2.
Are provided continuously (not shown) via the first address area Aad1 to form the first partial recording area APR1 over the sections S1 and S2. Similarly, over the sections S3 and S4, a second partial recording area APR2 is provided by the second ROM area Aro2, the second address area Aad2, and the second RAM area Ara2.

The angle center angles CA1 and CA for dividing the recording surface
2, CA3, and CA4 are equal, the recording surface of the partial ROM disc RPDA has R
The OM area Aro and the RAM area Ara are arranged alternately. However, the center angles CA1, CA2, CA3, and C
A4 may be set to different values, as described with reference to FIG. In addition, like this,
The configuration in which the partial recording area APR is formed of a portion obtained by dividing the recording surface of the disk in the circumferential direction at a predetermined center angle always rotates the disk at a constant speed regardless of the position of the optical head in the radial direction of the disk. CAV (Constant A
It is very effective for recording / reproducing in the (ngular Velocity) system. Furthermore, the angle division type partial ROM disc PRDA
Now, the ROM area Aro and the RAM area Ar of different materials
Since a is provided in each of the angle-divided areas without diffusing to the entire area of the recording surface, the productivity of the disk is not impaired.

FIG. 13 shows a zone division type partial ROM disk as a further example of the partial ROM disk according to the present invention. The zone division type partial ROM disk means a partial ROM disk whose recording surface is divided into a plurality of zones based on the ZCLV method.
In this figure, the zone division type partial ROM disc P
3 of the recording track Tr provided in one zone of the RDZ
The winding portions are shown as recording tracks Trm and Trm + 1. The recording track Trm is composed of 32 sectors from S1 to S32. Similarly, the recording track Trm + 1 is changed from S33 to S65 (not shown after S41).
The recording track Trm-1 is also composed of 32 sectors (not shown) from S0 to S-31.

In other words, the zone to which the recording track Trm belongs is constituted by 32 sectors on one circumference. One cluster (ECC circuit) is composed of 16 sectors, which corresponds to the case of P = Q = 1 defined in FIG. Furthermore, in the case of the ZCLV system, if the rotation speed is the same in the zone and the CAV system is used, the condition described in FIG. 12 is also satisfied in the zone.

The first 16 sectors S of the recording track Trm
The cluster C1o is composed of 1 to S16, and the cluster C1a is composed of the remaining 16 sectors S17 to S32. The first 16 sectors S33 to S48 of the recording track Trm + 1 form a cluster C2o, and the remaining 16 sectors S49 to S48
64 constitutes a cluster C2a. Similarly, clusters Cno and Cna are repeatedly formed by recording tracks Trm + n. A ROM area Aro is provided in clusters C1o, C2o,... Cno. Note that cluster C1o,
C2o,... Cno are recording tracks Trm, respectively.
Are located in substantially the same semicircular portion in the zone. Further, similarly, clusters C1a, C2a,.
The ROM area Aro is provided in na. As described above, the address area Aad interposed between the ROM area Aro and the RAM area Ara is not shown for the sake of visibility.

With such a configuration, in the zone, the ROM area Aro and the RAM area Ara are not diffused and are arranged in two semi-annular portions. As a result, the ROM area Aro and the RAM area Ara of different materials are used.
Can be collectively provided. Further, even between different zones, by adjusting the number of recording tracks Tr, the recording surface of the disk can be changed to the ROM areas Aro and RA.
It is also possible to bisect the entire recording surface, which can be roughly bisected into the M area Ara, for each area. Therefore, the same production efficiency as that of the angle division type partial ROM disk PRDA can be realized in the zone division type partial ROM disk PRDZ.

The partial ROM disk configured as described above can be used for a karaoke practice application. That is, a partial rom disc in which karaoke accompaniment data is recorded in the ROM area Aro is distributed to the user. When used as a recording disk with karaoke accompaniment, the user plays the karaoke accompaniment data from the ROM area Aro while singing along with the karaoke accompaniment being reproduced, and singing his own singing voice in the RAM area Ar.
Record in a. Then, later, the user can overwrite his / her own singing voice again while listening to the mixed sound of the accompaniment and his / her own singing voice.

With reference to the timing chart shown in FIG. 14, a recording / reproducing operation for the above-described partial ROM using the recording / reproducing apparatus RWA shown in FIG. 4 will be described. In the figure, the control signal S indicated in the upper part is shown.
a, Sb, Sc, Sf, Sg, and Src are enabled at a low (L) level. The middle section shows the relationship between the operation of each part of the recording and reproducing apparatus RWA and the target sector. That is, R (Sk) is the RF amplifier 12S
D (Sdd) indicates the sector from which the content of the digital reproduction data Sdd to be written to the reproduction memory 15 is being read, and P1 (Sdd ') And P2 (Sdd ') are digital reproduction data Sd output from the reproduction memory 15.
The sector from which the content of d 'is read is represented by R (SSe)
Represents a sector in which the digital digital recording data SSe to be written to the recording memory 16 is recorded, WT (Sw) represents a sector in which the recording signal Sw being generated is recorded, and RT
(Sw) indicates a sector in which the head unit 30 is writing the recording signal Sw. The lower part shows the reproducing operation mode of the recording / reproducing device RWA. The operation at the time of reproduction will be described first, and then the operation at the time of recording will be described.

At the time of reproduction, first, a track access signal Sat indicating a target recording track Tr to be reproduced is output to the head unit 30 by the control circuit 11, and the optical head 3 is moved to the target recording track Tr on the partial ROM disc. Move toward. In addition, any of the angle division type partial ROM disk PRDA and the zone division type partial ROM disk PRDZ can be used. For convenience of description, reproduction and recording of the recording track Trm of the zone-divided partial ROM disc PRDZ shown in FIG. 13 will be considered.

When the control circuit 11 confirms that the optical head 3 has arrived on the target recording track Trm based on the address data Sq, the control circuit 11 further moves the address area Aad of the target partial recording area APR. Wait to play. Then, based on the address information reproduced from the address area Aad, a time t1 at which the optical head 3 next accesses the target partial recording area APR is calculated.

At time t1, the control circuit 11 enables the disk read gate signal Sa. As a result, first, the sectors S1 to S16 of the cluster C1o are sequentially read from the recording track Trm by the optical head 3, and
The signal is input to the RF amplifier 12 as a reproduction signal SR. Further, as indicated by R (Sk), the RF amplifier 12
The input reproduction signal SR is converted to a reproduction data signal Sk (C1
sequentially output as o). In the future, a (cluster number) will be added after the symbol of each signal as necessary to indicate from which cluster the signal is read and which cluster contains information to be written. Reproduction data signal Sk (C1o) output from RF amplifier 12
Are subjected to A / D conversion and demodulation to generate digital reproduction data Sdd (C1o). That is, at time t1,
Output of the reproduction data signal Sk (C1o) is started.

At time t2, that is, when the optical head 3 completes reading data from the cluster C1o, the control circuit 11 enables the reproduction memory write gate signal Sb. As shown in D (Sdd), at time t1
From t to t2, the digital reproduction data Sdd (C1o) generated by the demodulation circuit 14 is written to the reproduction memory 15. As indicated by R (Sk), the data of the cluster C1a is read by the optical head 3 at the same time following the cluster C1o, and the RF amplifier 12, A /
Through the D conversion circuit 13 and the demodulation circuit 14, the output to the digital reproduction data Sdd (C1a) is started.

At time t3, that is, at the time when the readout of the reproduction data signal Sk (C1a) from the RF amplifier 12 and the completion of the output of the digital reproduction data Sdd (C1o) to the reproduction memory 15, the control circuit 11 outputs the disk read gate signal. Disable Sa. As a result, even if the optical head 3 reads data from the track Trm + 1 next to the target track Trm, the read data is RF
There is no output from the amplifier 12. As shown in D (Sdd), digital reproduction data Sdd (C1a) generated between time t2 and t3 is further stored in the reproduction memory 15
Writing to starts.

The time required for the optical head 3 to scan each cluster of the recording track Tr is uniquely determined by the cluster size and the rotation speed of the disk. Therefore, the cluster C1o scanning time (from time t1 to t2) is determined by the rom cluster scanning. The time Tro and the cluster C1a scanning time (from time t2 to t3) are defined as a ram cluster scanning time Tra. Z
In the CLV method, the ROM cluster scanning time Tro and the ram cluster scanning time Tra are constant within the same zone, and in the CAV method and the CLV method, over the entire recording surface. In the CLV system in which the rotation speed of the disk changes depending on the position of the recording track Tr, the ROM cluster scanning time Tro and the ram cluster scanning time T
ra is uniquely determined according to the position of the recording track Tr.

The processing speed between the RF amplifier 12 and the reproduction memory 15 is much higher than the speed at which the optical head 3 scans clusters and reads data. Therefore, as soon as the reproduction data signal Sk is output from the RF amplifier 12, the A / D conversion and the demodulation processing are completed.

At time t4, that is, at the time when the output of the digital reproduction data Sdd (C1a) is completed, the control circuit 11 disables the reproduction memory write gate signal Sb and prohibits the writing of data to the reproduction memory 15. .
Further, the control circuit 11 controls the reproduction memory read gate signal S
c and the recording memory read gate signal Sg are enabled to simultaneously start reading the data written in the reproduction memory 15 between times t2 and t4 as digital reproduction data Sdd ′ (C1a) and Sdd ′ (C1a). Let it. In other words, taking the example of the above-mentioned karaoke practice application, as shown in P1 (Sdd ') and P2 (Sdd'), the karaoke accompaniment recorded in the ROM area Aro and the user recorded in the RAM area Ara are indicated by P1 (Sdd '). The singing voice is mixed and played (presentation).

Digital data, such as video and audio, is recorded in the form of compressed or uncompressed code on an optical disc, including a partial ROM disc, and compressed or uncompressed data is reproduced from the disc at a high rate during playback. , The presentation time PT (t4 to t8) of the digital reproduction data Sdd ′ (C1o) and Sdd ′ (C1a) from one cluster is the reproduction data Sk (C1o) and Sk (C1a) from one cluster. ) Read time Tro (t1 to t2) and Tra (t2 to t)
It is much longer than 3). For example, 44.1 KHz, 1
Assuming that audio data is reproduced by 6 bits, that is, the presentation rate is 700 kbps and the reproduction rate from the disk is 10 Mbps, the presentation period PT of the digital reproduction data Sdd ′ (C1o) and Sdd ′ (C1a) is 1 Data Sk
The read times Tro and Tra of (C1o) and Sk (C1a) correspond to 70 ms. Since the decoding processing time of the signal read from the disk is substantially negligibly short, in the present invention, the spare time available for data processing is approximately 930 ms. If the recording data is compressed, the extra time is further increased.

The presentation preparation time PP (t1 to t4) required to read data from the cluster and perform signal processing required for reproduction, and the presentation period PT (t4 to t8) during which the data is reproduced. By utilizing the time difference, new data can be simultaneously recorded in the RAM area Ara while the data is being reproduced. In other words, the user can read the digital reproduction data Sd of the clusters C1o and C1a.
While listening to the performances recorded in d '(C1o) and Sdd' (C1a), it is possible to newly record their own singing voice in the cluster C1a. Hereinafter, a method of overwriting and recording on the above-described cluster being reproduced will be described.

When newly recording their own singing voice in the cluster C1a being reproduced, the user needs to record the singing voice between times t4 and t8.
Played accompaniment Sdd '(C1o) and singing voice Sdd' (C1
The singing voice of the user sung while listening to a) is, as needed, after the digital audio data SS generated by the audio input means such as a microphone is input to the ECC encoder 24 via the input terminal Ti and encoded, The recording memory 16 accumulates digital recording data SSe (C1o) based on the recording memory write gate signal Sf.
That is, R (SSe) is P1 (Sdd ′) and P2
During the presentation period t4 to t8 of (Sdd '),
Synchronized.

At time t8, that is, P1 (Sdd ') and P1
At the end of reproduction of 2 (Sdd ') and input of R (SSe), the control circuit 11 sets the recording memory read gate signal Sg
, The digital recording data SSe ′ is sequentially read from the recording memory 16, and the processing of the modulation circuit 17, the laser power control circuit 18, and the laser driving circuit 19 is performed. Since the presentation period PT of data that can be recorded in one cluster is uniquely determined by the coding method of the data, the time from time t4 to t9 is the presentation time P per cluster.
Corresponds to T.

At time t8, the control circuit 11 enables the recording memory read gate signal Sg. As a result, WT
As shown in (Sw), the digital recording data SS
e ′ is read from the recording memory 16, modulated, laser power controlled, and the recording signal Sw (C1
o) is generated and input to the laser drive circuit 19.

At time t9, the control circuit 11 enables the disk write gate signal Src. As a result, RT
As shown in (Sw), the laser drive circuit 19
w (C1o) is output, and the head unit 30 starts the bit mark recording corresponding to the additional recording sound on the cluster C1a. Note that the time difference between the times t8 and t9,
That is, the overwrite recording delay time Td is the cluster waiting time required for positioning the optical head 3 on the recording target cluster C1a in the time required for the modulation of the data SS input from time t4 to t8 and the signal processing for setting the laser power. T
This is the time obtained by adding c.

Since the time required for signal processing is as small as several tens of system clocks and can be ignored, the signal overwrite recording delay time Td can be considered to be substantially the same as the cluster waiting time Tw. In other words, the rotation speed of the disc is set to 2000r
Assuming pm, the cluster waiting time Twc, which is the maximum disk round trip time, is about 30 ms. More specifically, the signal processing time is uniquely determined by the data quality, size, processing method, and processing capability of the device. The cluster waiting time Twc is substantially equal to the above-described sector waiting time Tw because the partial recording area APR is continuously and repeatedly provided. That is, the recording / reproducing time Trew required to record data in the RAM after the reproduction of the ROM area does not require the seek time Ts and the rotation stabilization time Tc inherent to the conventional partial ROM disc. Therefore, the capacity of the buffer memory required for performing recording and reproduction without interruption over the ROM area and the RAM area may be as small as about Tw. Furthermore, the load on the processing system of the optical disk recording / reproducing apparatus can be reduced due to the reduction in buffering capacity, and the performance and manufacturing cost of the apparatus can be improved.

At time t10, as shown by RT (Sw), the writing of the cluster C1a ends. In this case, the time between time t9 and time t10 is the time required for the optical head 3 to record one sector of data.

Next, reproduction of the cluster C2o on the recording track Trm + 1 and recording of the cluster C2a will be considered. At time t3, when the optical head 3 finishes reading from the cluster C1a, it starts reading the recording track Trm + 1 from the cluster C2o. However, since the disk read gate signal Sa remains disabled at time t3, The reproduction data signal Sk (C2o) is not output from the RF amplifier 12. Recording track Trm +
The presentation preparation time PP required to read data from 1 and start a presentation is:
As described with the recording track Trm as an example, since it is uniquely determined by the cluster size and the rotation speed of the disk, the time is the same as the times t1 to t4. That is, if data reading from the recording track Trm + 1 is started at a time t5 which is earlier than the presentation end time t8 of the data on the recording track Trm by the presentation preparation period PP, the reproduction of the presentation between the tracks is started. No interruption occurs.

At time t5, the disk read gate signal Sa is enabled in the same manner as at time t1, and the cluster C2
o and the reproduced data signal Sk (C2o) is RF
Output from the amplifier 12. At time t6, as in time t2, the reproduction memory write gate signal Sb is enabled, writing of Sdd (C2o) to the reproduction memory 15 is started, and reproduction data Sk from the cluster C2a is started.
The output is started from the RF amplifier 12 of (C2a). At time t7, as in time t3, the disk read gate signal Sa is disabled and output from the RF amplifier 12 is prohibited, while writing of Sdd (C2a) to the reproduction memory 15 is started.

At time t8, similarly to time t4, the reproduction memory write gate signal Sb is disabled, and writing to the reproduction memory 15 is prohibited.

At time t14, as in time 7, the recording memory read gate signal Sg is enabled, read out from the recording memory 16, and processed by the modulation circuit 17 and the laser power control circuit 18 to cause the laser drive circuit 19 to operate.
Is input to

At time t15, similarly to time 9, the disk write gate signal Src is enabled, and the head unit 30 starts bit mark recording on the cluster C2a.

As described above, in the latter half of the presentation of the recording track Trm (time t5 to t8), the reading processing of the next recording track Trm + 1 is simultaneously processed in a temporally overlapping manner. That is, the presentation preparation time PP for the subsequent recording track is provided during the presentation period PT of the preceding track. In the present invention, the ROM area Aro and the RAM area Ara
There is no need to seek the optical head 3 between them, that is, there is no need to absorb the head seek time in the PT during the presentation period, so that the next presentation can be prepared with a margin.

As described above, in the present invention, the ROM
RO of an optical disk in which areas and RAM areas are alternately arranged
Simultaneous recording and reproduction, in which the M area and the RAM area are simultaneously overwritten in the RAM area while reproducing at a predetermined timing, can be realized, which is effective for karaoke practice and the like. The reproduction data memory 15 and the recording data memory 16 have a storage capacity necessary for buffering the rotation waiting time of the disk. Further, a buffer memory for absorbing the seek time of the optical head 3 is unnecessary. Further, by dividing one cluster into data of a plurality of channels and using the data, application of recording and reproducing data of a plurality of channels in a ROM area and a RAM area, respectively, becomes possible.

As data, not only audio data but also device control data such as video data and MIDI data can be handled, and various application examples can be considered. For example, in the case of handling video data, the golf swing of the user himself is recorded in the RAM area while reproducing the swing moving image of the professional golfer previously recorded in the ROM area. Next, the professional swing recorded in the ROM area and the user's own swing recorded in the RAM area are simultaneously reproduced and compared. Referring to the research results, this is an application example in which the user swings again and overwrites his own swing in the RAM area again.

[0102]

As is apparent from the above description, according to the present invention, the ROM area of the partial ROM and the RA
Since access to the M area does not involve seeking of the optical head, high speed can be realized. In addition, ROM of Charlom disk
Since the area Aro and the RAM area Ara are continuously and repeatedly provided via the address area Aad, access to both areas can be realized at high speed without seeking the optical head. As a result, during the reproduction period, the data recorded in the ROM area is continuously or discontinuously stored in the ROM area.
Data can be recorded in the area.

Further, the data recorded in the ROM area and R
During simultaneous reproduction of data recorded in the AM area, data can be recorded in the RAM area being reproduced or in another RAM area. Taking advantage of these features, application development to multimedia data such as video and audio data can be realized on a partial ROM disk that combines a read-only ROM disk disk suitable for mass distribution and a rewritable RAM disk. Easy.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing the structure of a recording track Tr of a partial ROM according to the present invention.

FIG. 2 is a schematic diagram showing a reproduction signal from an address area Aad of an adjacent track shown in FIG.

FIG. 3 is a schematic diagram showing a state in which a partial ROM disk according to the present invention is housed in a protective cartridge.

FIG. 4 is a block diagram showing the structure of a recording / reproducing apparatus for a partial ROM disc according to the present invention.

FIG. 5 is a block diagram showing a detailed configuration of the A / D conversion circuit shown in FIG.

FIG. 6 is a block diagram showing a detailed configuration of a voltage comparison circuit shown in FIG.

7 is an explanatory diagram of threshold processing by the voltage comparison circuit shown in FIG.

FIG. 8 is an explanatory diagram of laser power setting by the laser power control circuit shown in FIG.

FIG. 9 is a schematic diagram showing a partial recording area composed of two consecutive sectors.

FIG. 10 is a schematic diagram showing a partial recording area composed of three consecutive sectors.

FIG. 11 is a schematic diagram showing a partial recording area composed of two consecutive clusters.

FIG. 12 is a plan view showing a configuration of a recording surface of an angle division type partial ROM disk according to the present invention.

FIG. 13 is a plan view showing a configuration of a recording surface of a zone division type partial ROM disk according to the present invention.

14 is a time chart for explaining a recording / reproducing operation of the recording / reproducing apparatus shown in FIG.

FIG. 15 is a plan view showing a configuration of a recording surface of a partial ROM disc.

[Explanation of symbols]

 APR Partial recording area Aro ROM area Ara RAM area Mro, Mad, Mra Bit mark Pa (m, m + 1) pit group Trm Recording track Gg Guide groove PRD Partial ROM disk 2 Spindle motor unit 3 Optical head 4a, 4b, 4c, 4d, 4e, 4f Preamplifier 5 Focus differential amplifier 6 Focus servo control circuit 7 Focus actuator 8 Differential amplifier 9 Tracking servo control circuit 10 Tracking actuator 11 Control circuit 12 RF amplifier 13 A / D conversion circuit 14 Demodulation circuit 15 Reproduction memory Reference Signs List 16 recording memory 17 modulation circuit 18 laser power control circuit 19 laser drive circuit 23 ECC encoder 24 ECC decoder Sa disk read gate signal Sb playback memo Rewrite gate signal Sc Reproduction memory read gate signal Sd Digital reproduction signal SD Reproduction data SD Sdd, Sdd 'Digital reproduction data SS Digital source data SSe, SSe' Digital recording data SSm Modulation recording signal Sw Recording signal Sn Disk 1 rotation signal Sn So Spindle Revolution number signal Sp Spindle control signal Sat Track access signal Sf Recording memory write gate signal Sg Recording memory read gate signal Sh Servo switching signal Sh Si Area switching signal Si Sj Tracking error signal Sj Sk Reproduced data signal Sk Sl Reproduced data envelope signal SL Vm Threshold voltage V1 Non-inverted digital signal V2 Inverted digital signal V3 Subtraction result signal

 ──────────────────────────────────────────────────の Continuing on the front page (72) Mayumi Otowa, Inventor 1006 Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd.

Claims (36)

[Claims] 1. An optical disc recording medium (PRD), comprising: a recording track (T) for recording information (SS) extended around a center of the disc recording medium (PRD).
r), a first recording area (Aro) provided on the recording track (Tr) and used for information reproduction, and a first recording area (Ar) on the recording track (Tr).
An optical disc recording medium (PRD) comprising: a second recording area (Ara) provided for recording and reproducing information, which is provided continuously to o). 2. The optical disk recording medium (PRD) according to claim 1, wherein the first and second recording areas (Aro, Ara: AP)
R) is an optical disk recording medium (PRD) provided repeatedly and continuously on the recording track (Tr). 3. The optical disc recording medium (PRD) according to claim 2, wherein the first recording area (Aro) is a recording track defined by a first center angle (CA1, CA3) of the optical disc medium. Wherein the second recording area (Ara) has a recording track length defined by a second central angle (CA2, CA4) of the optical disc medium.
D). 4. The optical disk recording medium (PRD) according to claim 3, wherein the sum of the first center angle (CA1, CA3) and the second center angle (CA2, CA4) is an integer of 360 degrees. An optical disc recording medium (PRDA), characterized in that: 5. The optical disc recording medium (PRD) according to claim 2, wherein the second recording area (Ara) provided repeatedly and continuously on the recording track (Tr) is radially oriented. An optical disc recording medium (PRD), wherein guide grooves (Gg) are formed alternately. 6. The optical disk recording medium (PRD) according to claim 1, further comprising: recording address information of at least one of the first recording area (Aro) and the second recording area (Ara). An optical disc recording medium (PRD) having a third recording area (Aad). 7. The optical disc recording medium (PRD) according to claim 6, wherein the third recording area (Aad) is the first recording area (Ard).
o) An optical disc recording medium (PRD) provided between the second recording area (Ara) and the second recording area (Ara). 8. The optical disk recording medium (PRD) according to claim 7, further comprising: the second area (Ara) of the first recording area (Aro).
An optical disc provided with at least a fourth recording area (Aad) for recording address information of at least one of the first recording area (Aro) and the second recording area (Ara). Recording medium (PRD). 9. The optical disk recording medium (PRD) according to claim 6, wherein the third recording area (Aad) is the first recording area (Ar).
An optical disc recording medium (PRD), which is provided on the opposite side of the second area (Ara) of (o). 10. The optical disk recording medium (PRD) according to claim 6, wherein the third recording area (Aad) is the same as the first recording area (Aro). (PRD). 11. The optical disk recording medium (PRD) according to claim 6, wherein the third recording area (Aad) is the same as the second recording area (Ara). (PRD). 12. The optical disk recording medium (PRD) according to claim 1, wherein the recording track (Tr) is provided in a spiral shape. 13. The optical disk recording medium (PRD) according to claim 1, wherein said recording tracks (Tr) are provided concentrically. 14. The optical disc recording medium (PRD) according to claim 1, wherein the first recording area (Aro) is
An optical disk recording medium (PRD) for recording information by providing irregularities (Mro) on the surface. 15. The optical disc recording medium (PRD) according to claim 1, wherein the second recording area (Ara) is
An optical disk recording medium (PRD) for recording information by changing a crystal state of a surface. 16. The method of claim 1, claim 2, claim 3, claim 4, claim 5, claim 12, claim 13, and claim 1.
A recording / reproducing apparatus (RW) for recording / reproducing information on / from an optical disk (PRD) according to at least one of claims 4 and 15.
A), wherein the first recording area (Aro) and the second recording area (Ar
a) scanning means (30, 12) for generating reproduction signals (Sr, Sk); and scanning the second recording area (Ara) for recording signals (Sr, Sr).
recording means (30, 19) for recording w). 17. The recording / reproducing apparatus (R) according to claim 16,
WA), and further, based on the reproduction signal (Sdd, Sq), the scanning area (A
area switching timing detection means (11) for generating a timing signal (Si, Sh) indicating the time of switching between the first area (Aro) and the second area based on the timing signal (Sh). (Ara), the reproduction signal (S
A recording / reproducing apparatus (RWA) comprising: a reproducing signal control means (6, 9) for correcting the gain value and the offset value of r). 18. The recording / reproducing apparatus (R) according to claim 16,
WA), and further, based on the reproduction signal (Sdd, Sq), the scanning area (A
area switching timing detection means (11) for generating a timing signal (Si, Sh) indicating the time of switching between the first area (Aro) and the second area based on the timing signal (Si). And a tracking control means (9) for switching a tracking method of said reproducing means (30, 12) for each (Ara). 19. A recording / reproducing apparatus (RWA) for recording / reproducing information on / from an optical disk (PRD) according to at least one of claim 6, claim 7, claim 9, claim 10, and claim 11. The first recording area (Aro) and the second recording area (Ar
a) and at least the third recording area (Aad) of the third recording area (Aad) is scanned to reproduce the reproduction signals (Sk, Sad).
q) for generating the recording signal (S) by scanning the second recording area (Ara).
recording means (30, 19) for recording w). 20. The optical disk according to claim 8, wherein
D) a recording / reproducing apparatus (RWA) for recording / reproducing information in / from the first recording area (Aro) and the second recording area (Ar
a), the third area (Aad) and the fourth recording area (Aa)
d) Reproduction means (30, 1) for scanning at least the third recording area (Aad) to generate reproduction signals (Sk, Sq).
2) scanning the second recording area (Ara) and recording signals (S
recording means (30, 19) for recording w). 21. The optical disk (PR) according to claim 8,
D) a recording / reproducing apparatus (RWA) for recording / reproducing information in / from the first recording area (Aro) and the second recording area (Ar
a), the third recording area (Aad), and the fourth area (A
ad), and scans at least the fourth recording area (Aad) to generate a reproduction signal (Sk, Sq).
0, 12), and scanning the second recording area (Ara) to record a recording signal (S
recording means (30, 19) for recording w). 22. The recording / reproducing apparatus (RWA) according to at least one of claim 19, claim 20, and claim 21.
An area switching timing detecting means (11) for generating a timing signal (Si, Sh) indicating when a scanning area is switched based on the reproduction signal (Sdd, Sq); and the timing signal (Sh). Based on the above, between the time of scanning the first area (Aro) and the time of scanning the second area (Ara), a reproduction signal control means (Sr) for correcting a gain value and an offset value of the reproduction signal (Sr). 6. A recording / reproducing apparatus (RWA) comprising: 23. The recording / reproducing apparatus (RWA) according to at least one of claims 19, 20, and 21.
In addition, the reproduction signal control means (6, 9) further comprises the first area (A
ro) and when scanning the third area (Aad), there is provided reproduction signal control means (6, 9) for correcting the gain value and the offset value of the reproduction signal (Sr). Characteristic recording / reproducing device (RWA). 24. A recording / reproducing apparatus (RWA) according to at least one of claim 19, claim 20, and claim 21.
An area switching timing detecting means (11) for generating a timing signal (Si, Sh) indicating when a scanning area is switched based on the reproduction signal (Sdd, Sq); and the timing signal (Si). A tracking control unit (9) for switching a tracking method of the reproducing unit (30, 12) between when scanning the first area (Aro) and when scanning the second area (Ara) based on A recording / reproducing apparatus (RWA) comprising: 25. The recording / reproducing apparatus (RWA) according to at least one of claim 19, claim 20, and claim 21.
Wherein the tracking control means (9) further comprises:
When the first area (Aro) is scanned and the third area (Aad) is scanned, the reproducing means (30,
12) A recording / reproducing apparatus (RWA), which comprises switching the tracking method. 26. Claim 1, Claim 2, Claim 3, Claim 4, Claim 5, Claim 12, Claim 13, Claim 1.
16. A method for recording / reproducing information on / from an optical disk (PRD) according to at least one of claim 4 and claim 15, wherein the first recording area (Aro) and the second recording area (Ar
a) to generate reproduction signals (Sr, Sk), and scan the second recording area (Ara) to generate a recording signal (Sr).
w) recording and reproducing method. 27. The recording / reproducing method according to claim 26, further comprising: generating a timing signal (Si, Sh) indicating when a scanning area is switched based on the reproduction signal (Sdd, Sq). Based on the timing signal (Sh), the reproduction signal (Sro) is provided for each of the first area (Aro) and the second area (Ara).
and r) correcting the gain value and the offset value. 28. The recording / reproducing method according to claim 26, further comprising: switching a tracking method for each of the first area (Aro) and the second area (Ara) based on the timing signal (Si). A recording / reproducing method characterized in that: 29. An optical disk (PR) according to at least one of claims 6, 7, 9, and 11.
D) a recording / reproducing method for recording / reproducing information in / from the first recording area (Aro) and the second recording area (Ar
a) and at least the third recording area (Aad) of the third recording area (Aad) is scanned to reproduce the reproduction signals (Sk, Sad).
q), and a timing signal (Si, Sh) indicating when the scanning area is switched based on the reproduction signal (Sdd, Sq). Based on the timing signal (Sh), the first area ( Aro), and the gain value and the offset value of the reproduction signal (Sr) are corrected between when scanning the second area (Ara) and when scanning the third area (Aad). Playback method. 30. An optical disk (PR) according to at least one of claims 6, 7, 9, and 11.
D) a recording / reproducing method for recording / reproducing information in the first recording area (Aro) and the second recording area (Ar).
a) and at least the third recording area (Aad) of the third recording area (Aad) is scanned to reproduce the reproduction signals (Sk, Sad).
q), and a timing signal (Si, Sh) indicating when a scanning area is switched based on the reproduction signal (Sdd, Sq). 31. The optical disk (PR) according to claim 8,
D) a recording / reproducing method for recording / reproducing information in the first recording area (Aro) and the second recording area (Ar).
a), the third recording area (Aad) and the fourth recording area (Aa)
d), at least the third recording area (Aad) is scanned to generate a reproduction signal (Sk, Sq), and a timing signal (Si) indicating when the scanning area is switched based on the reproduction signal (Sdd, Sq). , Sh). 32. The optical disk (PR) according to claim 8,
D) a recording / reproducing method for recording / reproducing information in the first recording area (Aro) and the second recording area (Ar).
a), third area (Aad) and third recording area (Aad)
Out of the fourth recording area (Aad) to generate a reproduction signal (Sk, Sq), and a timing signal (Si, Sh) indicating when the scanning area is switched based on the reproduction signal (Sdd, Sq). ) Is generated. 33. The recording / reproducing method according to claim 30, wherein the first area (Aro) is further provided based on the timing signal (Sh). ) And when scanning the second area (Ara), the gain value and the offset value of the reproduction signal (Sr) are corrected. 34. The recording / reproducing method according to claim 30, wherein the first area (Aro) is further provided based on the timing signal (Sh). ) And when scanning the third area (Aad), the gain value and the offset value of the reproduction signal (Sr) are corrected. 35. The recording / reproducing method according to claim 30, wherein the first area (Aro) is further provided based on the timing signal (Si). ) And the scanning of the second area (Ara) are switched between tracking methods. 36. The recording / reproducing method according to claim 30, wherein the first area (Aro) is further provided based on the timing signal (Si). ) And the third area (Aad) are scanned by switching the tracking method.