JP2720682B2 - Disk recording device and reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording and reproducing apparatus for recording digital information such as video and audio on an MCAV optical disk.

[0002]

2. Description of the Related Art Conventionally, disks or tapes have been used as media for recording video and audio.

As a disk for recording audio, for example,
A compact disc (CD) is well known as a read-only disc. Recently, write-once and rewritable optical disks have also been developed. On the other hand, a laser disk is well known as a disk on which video is recorded in an analog system. Below, on a conventional optical disk,
A case where digital video information is recorded will be described as an example. The signal rate of digital video information is about 120 Mbit / s in the case of NTSC. Normally, the transfer rate of a recording signal to an optical disk is about 10 Mbit / sec. Therefore, by compressing the above 120 Mbit / sec digital video information to about 5 Mbit / sec, it is possible to record on the optical disc. Become.

FIG. 19 is a diagram showing a track configuration on a conventional rewritable optical disk, and FIG. 20 is a diagram showing a configuration of an apparatus for recording digital information on a conventional rewritable optical disk. In FIG. 19A, reference numeral 1 denotes a spiral track 2 on which information is recorded on an optical disc. Also, as shown in FIG. 19B, the track 2 is radially divided to form a sector 3. It is assumed that the signal is recorded continuously from the inner circumference. In addition, the rotation control of the disk is performed by a constant rotation number MCAV (Modified).
Constant Angular Veocity). This M
CAV is controlled by a rotation control at a substantially constant angular velocity.
While having the same high-speed access performance as the Nstant Angular Veocity, the number of sectors on the outer track is larger than the number of sectors on the inner track. FIG. 19 (b) shows the number of sectors within the angle θ in each track. In the area 1 on the inner circumference side, one sector per angle θ, in the area 2 on the outer circumference side, two sectors per angle θ, and as the outer circumference side, the sector becomes closer. The number is increasing. With such a configuration, the MCAV optical disk can increase the storage capacity of the optical disk 1 as compared with the CAV. That is, the MCAV optical disk has a larger storage capacity than the CAV optical disk,
It has the advantage that the access speed is faster than CLV optical disks.

The operation of recording digital video information on the optical disk having the above-described configuration will be described below.

First, in FIG. 20, 1 is the same as FIG. 19, 4 is an optical head, 5 is a spindle control means, 6 is a transfer means for transferring the optical head 4 from the inner circumference to the outer circumference of the optical disk 1, and 7 is a spindle. The rotation of the optical disk 1 is controlled by the spindle controller 5. 11 is input digital video information, 12 is recording means, 13 is a recording signal, 14
Is a reproduction signal, 15 is reproduction means, 16 is output digital information, 17 is control means, 18 is a spindle control signal, 19
Is a transfer control signal, and 20 is a tracking control signal.
In FIG. 20, input digital information 11 is stored in recording means 1.
2, a parity for error correction is added, and further, a modulation such as (2, 7) modulation for generating a mark pattern is performed on a spiral track on the disk, and a recording signal 13 is generated by adding a synchronization signal. I do. The spindle control means 5 rotates the optical disc 1 at a substantially constant angular velocity. The optical head 1 is on-track on the track 2 by the tracking control signal 20 given from the control unit 17.

FIG. 21 shows the relationship among the number of rotations, the transfer rate, the recording mark length and the position on the optical disk 1. In FIG. 21, the horizontal axis shows the position on the radius of the optical disc 1, and the vertical axis shows the rotation speed, the transfer rate, and the recording mark length, respectively. The rotation speed of the optical disc 1 is constant from the inner circumference to the outer circumference of the optical disc 1 as shown in FIG. FIG.
Since the number of sectors per track increases toward the outer periphery as shown in FIG.
As shown in FIG. 1B, the optical head 4 increases stepwise as it moves from the inner peripheral portion to the outer peripheral portion of the optical disc 1.
As a result, the mark length recorded in the sector 3 of the optical disc 1 has a predetermined range (L1 to L
2). At the time of recording, the recording power output from the semiconductor laser needs to be changed according to the transfer rate.

On the other hand, in the reproducing system, a reproduced signal 14 reproduced from the optical head 4 is inputted to a reproducing means 15, demodulated and error-corrected. Output digital information 16 is output from the reproducing means 5.

[0009]

However, in the above-mentioned conventional configuration, a problem occurs when information having a substantially constant signal rate such as digital audio or video is recorded on the MCAV optical disk. That is, FIG.
As shown in (b), the transfer rate is higher at the outer circumference of the optical disc 1 than at the inner circumference. Therefore, when recording information with a constant signal rate, an empty area is created in a sector in the outer peripheral area compared to the inner peripheral area by the difference between the signal rate and the transfer rate, and the use efficiency of the recording area of the optical disk 1 is reduced. Problem arises.

The present invention solves the above-mentioned conventional problems. When digital information is recorded on an optical disk under MCAV control, recording at a constant signal rate can be performed without deteriorating the use efficiency of the recording area of the optical disk 1. Can be performed continuously. Also, it is possible to reproduce digital information at a constant signal rate from an MCAV-controlled optical disk in which digital information is continuously recorded on a sector.

[0011]

In order to achieve this object, a disk recording apparatus according to the first aspect of the present invention is a rotating apparatus for rotating an optical disk having a sector obtained by dividing a spiral or concentric track at a substantially constant angular velocity. Control means;
Timing control means for generating a transfer clock and increasing the frequency of the transfer clock toward the outer periphery of the optical disk; memory means for storing input digital information; write address generation means for generating a write address for the memory means; A read address generating means for generating a read address of the memory means in accordance with a command and changing a reading speed of digital information from the memory means in accordance with a frequency of the transfer clock; and determining a difference between the write address and the read address. Recording command generating means for instructing recording when the read value is equal to or greater than a first threshold value and outputting the recording instruction for instructing recording stop when the value is equal to or less than a second threshold value; Move the optical head on the track And tracking control means for a track jump the optical head, in which a recording means for recording on the optical disk digital information read from said memory means at a timing corresponding to the frequency of the transfer clock in accordance with the recording command.

The disk recording apparatus according to the second aspect of the present invention is output from rotation control means for rotating an optical disk having a sector obtained by dividing a spiral or concentric track at a substantially constant angular velocity, and reference clock generation means. A reference clock and an output through a variable frequency dividing means for dividing the output of the voltage controlled oscillating means by N are input to a phase comparing means, and an output of the phase comparing means is input to the voltage controlled oscillating means through a loop filter; Timing control means for increasing the frequency of a transfer clock obtained as an output of the voltage controlled oscillation means toward the outer periphery of the optical disc; frequency division ratio setting means for instructing the variable frequency division means on a frequency division ratio; A write address generating means for generating a write address of the memory means, Read address generating means for generating a read address of the memory means and changing a read speed of digital information from the memory means in accordance with the frequency of the transfer clock; and reading a difference between the write address and the read address. If the value is greater than or equal to the first threshold, recording is instructed and the second
Recording command generating means for outputting the recording command for instructing recording stop when the recording head is equal to or less than the threshold value, and tracking control means for causing the optical head to be on-track on the track and for the optical head to jump according to the recording command. And recording means for recording digital information read from the memory means on the optical disk at a timing corresponding to the frequency of the transfer clock in accordance with the recording command.

The disk recording apparatus according to a third aspect of the present invention, in addition to the configuration according to the first or second aspect, further comprises: a synchronous clock extracting means for extracting a synchronous clock from a synchronous signal area of the sector; And the timing control means for generating the transfer clock based on the clock.

A disk recording apparatus according to a fourth aspect of the present invention has the structure of the first, second, or third aspect of the invention,
A signal rate designating unit for designating a signal rate; an information area divided into predetermined sections for recording the input digital information; a TOC area for recording a section number of the section and a start address of the section; Signal rate information generated by the signal rate designating means is recorded in the TOC area on the optical disk together with the section number and the start address of the section, and digital information read from the memory means is recorded in the information area. Recording means.

The disk recording apparatus according to a fifth aspect of the present invention is a disk recording apparatus, comprising: a rotation control means for rotating an optical disk having a sector obtained by dividing a spiral or concentric track at a substantially constant angular velocity; Reproducing means for reproducing a signal from the increasing optical disk using an optical head, a timing control means for supplying a predetermined transfer clock to the reproducing means, and increasing the frequency of the transfer clock toward the outer periphery of the optical disk; Memory means for storing the digital information reproduced from the reproducing means, a write address for the memory means being generated in accordance with a reproduction command, and a writing speed of the digital information to the memory means being changed in accordance with the frequency of the transfer clock; A write address generating means, and a read address of the memory means. A read address generating means for generating a read address, reading a difference between the write address and the read address, instructing reproduction when the value is equal to or less than a third threshold value, and stopping reproduction when the value is equal to or greater than the fourth threshold value And a tracking control means for causing the optical head to be on-track on the track and for the optical head to make a track jump in accordance with the reproduction command.

According to a sixth aspect of the present invention, there is provided a disk recording apparatus according to the fifth aspect, further comprising: synchronous clock extracting means for extracting a synchronous clock from a synchronous signal area of the optical disk; And means for generating the transfer clock.

According to a seventh aspect of the present invention, in addition to the configuration of the fifth or sixth aspect, the disc recording apparatus further comprises an information area divided into predetermined sections for recording input digital information, and Signal rate extracting means for extracting signal rate information from the TOC area on the optical disk having a section number and a TOC area for recording a start address of the section; and the memory based on the extracted signal rate information. Read address generation means for changing the read speed of the means.

[0018]

According to the disk recording apparatus of the first invention, when recording digital information at a constant signal rate on an optical disk in which the frequency of the transfer clock increases stepwise at the outer peripheral portion, the digital information is read from the memory means. The read speed is changed according to the frequency of the transfer clock, the difference between the write address and the read address is read, and if the value is equal to or greater than a first threshold value, recording is instructed, and a second threshold is indicated. If the value is equal to or less than the value, the recording instruction for instructing the recording stop is output, and the optical information is turned on the track and the optical head is caused to perform a track jump according to the recording instruction. It is possible to record continuously on the optical disc at the timing according to the frequency. That.

According to the disk recording apparatus of the second invention, in addition to the operation of the first invention, the disk recording apparatus of the second invention arbitrarily transfers the transfer from the outside by instructing the frequency division ratio to the frequency division ratio variable means. The frequency of the clock can be varied.

According to the third aspect of the present invention, in addition to the functions of the first and second aspects, the disk recording apparatus of the third aspect generates the transfer clock based on the synchronous clock signal extracted by the synchronous clock extracting means. Timing can be controlled.

According to the fourth aspect of the present invention, in addition to the functions of the first to third aspects, the disk recording apparatus of the fourth aspect further includes the signal rate information generated by the signal rate designating means.
Input digital information can be recorded in the information area while being recorded in the OC area.

According to the fifth aspect of the present invention, with the above structure, the frequency of the transfer clock is increased stepwise at the outer periphery, and the optical disk on which digital information is recorded is continuously reproduced. The writing speed at which information is written to the memory means is changed in accordance with the frequency of the transfer clock, and the difference between the write address and the read address is read. If the value is equal to or less than a third threshold, reproduction is instructed. When the value is equal to or larger than the fourth threshold value, the reproduction command for instructing the reproduction to be stopped is output. According to the reproduction command, the optical head is turned on the track and the optical head is caused to jump. Information can be reproduced at a constant signal rate.

In the disk reproducing apparatus according to a sixth aspect of the present invention, in addition to the fifth operation, the above-described configuration generates the transfer clock based on the synchronous clock extracted from the synchronous clock extracting means and controls the timing. Can be.

According to the seventh aspect of the present invention, in addition to the fifth operation, the disk reproducing apparatus of the present invention changes the reading speed of the memory means based on the signal rate information recorded in the TOC area. Can be.

[0025]

An embodiment of the present invention will be described below with reference to the drawings.

The first embodiment of the present invention is for recording digital video information having a constant signal rate. In the optical disc 1, the number of sectors per track increases on the outer peripheral side as shown in FIG. 19, and the transfer rate increases on the outer peripheral side as shown in FIG.

FIG. 1 is a diagram showing a configuration of a recording apparatus according to a first embodiment of the present invention, FIG. 2 is a diagram showing recording timing in the first embodiment, and FIG. 3 is a diagram showing recording on a track on a disk. FIG. In FIG. 1, 1, 4,
5, 6, 7, 11, 18, and 19 are the same as the conventional example shown in FIG. The track configuration on the disk is the same as the conventional example shown in FIG. 101 is a memory means, 102 is digital information output from the memory means 101, 103
Is a write address generating means for generating a write address 104 of the memory means 101, and 105 is a memory address 10
Read address generating means for generating one read address 106, recording means 107, recording signal 108,
09 is a timing control means, 110 is a transfer clock, 1
11 is a tracking control unit, 112 is a tracking signal, 113 is a recording command generation unit, and 114 is a recording command. In this case, the signal rate of the digital information in the recording signal 108 is equal to or greater than the signal rate of the input digital information 11. FIG. 2A shows the relationship between the recording position of the optical disc 1 and the transfer clock 110, and FIG.
In (c) and (d), the vertical axes represent the recording positions P1 and P, respectively.
2, input digital information 11 at P3, recording command 11
4, the recording signal 108 and the amount of data in the memory means 101, and the horizontal axis represents the case where the signal rate of the input digital information 11 is equal to the signal rate of the digital information in the recording signal 108, respectively. (B), a case where it is slightly small (c), and a case where it is small (d) are shown. In FIG. 2, reference numeral 201 denotes a recording unit in which a predetermined number (≧ 1) of sectors is collected and is referred to as a cluster.
1, D2, D3,... Also, the recording command 114
Is "1" for recording and "0" for recording stop.
Reference numeral 121 denotes a first threshold value indicating recording start, and reference numeral 122 denotes a second threshold value indicating recording stop. In FIG. 3, 30
1 indicates a recording position P1, 302 indicates a recording position P2, and 303 indicates a state of recording on a track at the recording position P3.
4,305 indicates a track jump.

The operation of the disk recording apparatus of the present embodiment configured as described above will be described below with reference to FIGS. In FIG. 1, input digital information 11 is written into memory means 101 by write address 104 generated by write address generation means 103 in accordance with the signal rate of input digital information 11, and read address 106 is generated by read address generation means 105. Is read. The digital information 102 output from the memory means 101 is input to the recording means 107. The recording means 107 adds parity for error correction to the digital information 102,
The modulation on the sector on the disk is performed to generate a mark pattern, a synchronization signal is added, the recording signal 108 is output at the timing of the transfer clock 110, and the optical head 4 is driven. The tracking control means 111 causes the optical head 4 to track on the track 2 of the optical disk 1. The spindle control means 5 rotates the optical disc 1 at a substantially constant angular velocity. The write address 104 and the read address 106 are input to the recording command generator 113. The recording command generation means 113 calculates the difference between the write address 104 and the read address 106, compares the difference signal with a predetermined threshold value, and uses the comparison output as a recording command 114 as the read address generation means 105 and the tracking control means 111. , To the recording means 107. Memory means 101
The reading speed at which the digital information 102 is read out from the CPU is determined based on the transfer clock 110. That is, at the timing of the transfer clock 110, the digital information 102
Is read and recorded on the optical disk 1.

Since the transfer rate of the optical disk 1 increases as the radius of the optical disk 1 increases as shown in FIG. 21, the transfer clock 110 increases as the radius increases as shown in FIG. Timing control means 109
Generated by The input digital information 11 is written to the memory means 101 by a write address 104 generated according to the signal rate of the input digital information 11, and is read by a read address 106. At this time,
Since the signal rate of the digital information in the recording signal 108 is equal to or higher than the signal rate of the input digital information 11, the digital information 10
The read speed of 2 is equal to or greater than the write speed. 2 (c) to 2 (d), a first threshold value 121 and a second threshold value 122 are set,
The difference between the write address 104 and the read address 106 is obtained, and when the difference is equal to or larger than the first threshold value 121, the operation of the read address generating means 105 is started by the recording command 114, and the digital information is read from the memory means 101. 102 is read, and a recording signal 108 is output from the recording means 107. On the other hand, a difference between the write address 104 and the read address 106 is obtained, and when the difference is equal to or smaller than the second threshold value 122, the operation of the read address generation unit 105 is stopped by the recording command 114,
The reading of the digital information 102 from the memory unit 101 is stopped, and the supply of the recording signal 108 from the recording unit 107 is stopped. At the same time, a recording command 114 is sent to the tracking control means 111 to cause the optical head 2 to jump one track. During one rotation of the disk after the track jump, the data capacity in the memory means 101 recovers, and when the data capacity exceeds the first threshold value 121, the recording operation is started. FIG. 2B shows a case where recording is performed at the recording position P1, where the reading speed from the memory unit 101 is equal to the writing speed, and the data capacity in the memory unit 101 is constant. Recording on the track is continuously performed as indicated by 301 in FIG. FIG. 2C shows a case where recording is performed at the recording position P2. As a result of the increase in the transfer rate, the reading speed becomes higher than the writing speed, and the recording command is changed to "".
1 ", that is, while the cluster is being recorded, the memory means 1
01 decreases by the difference between the writing speed and the reading speed, and when the recording command is “0”, the memory means 101
The data capacity within increases with the signal rate of the input digital information. For recording on a track, as shown at 302 in FIG. 3, after recording four clusters, D1 to D4, a track jump to the track on the inner circumference side of one track is performed (304 in FIG. 3).
After one round, the next cluster is recorded. FIG. 2D shows a case where recording is performed at the recording position P3. As a result of the transfer rate being further increased, the read speed is further increased than the write speed, and the time interval between recording and recording stop is shortened. Recording on the track consists of two clusters and D as shown at 303 in FIG.
After recording 1 to D2, the track jumps to the track on the inner circumference side of one track (305 in FIG. 3), and after one round, the next cluster is recorded. As described above, as shown in FIG. 3, the recording operation is performed continuously on the inner peripheral portion of the optical disc 1 and on the outer peripheral portion using a track jump so as to form a continuous recording pattern on the track.

The read address 106 is generated based on the transfer clock 110. Transfer clock 11
Since the frequency of 0 increases stepwise as the optical head 2 moves from the inner circumference to the outer circumference of the optical disc 1 as shown in FIG. 2A, the read speed of the read address 106 is also reduced. Increases from the inner circumference to the outer circumference of the optical disc 1 in accordance with the transfer clock. Digital information 1 read by read address 106
02 is added to the recording means 107. As a result, the sector frequency of the optical disc 1 increases as going to the outer peripheral side. In addition, the input digital information at a constant signal rate is continuously recorded on the track 2 of the optical disc 1 without any empty track.

As described above, according to the first embodiment of the present invention, input digital information at a constant signal rate is recorded on an MCAV optical disc by generating an empty sector at the inner and outer peripheral portions having different transfer rates. And efficient recording is possible.

FIGS. 4 and 5 show a second embodiment of the present invention. The second embodiment is a case where the threshold value is changed in addition to the first embodiment. That is, the object is to stabilize the operation by reducing the number of track jumps in the outer peripheral portion of the optical disc 1.

FIG. 4 is a diagram showing the configuration of a recording apparatus according to the second embodiment of the present invention, and FIG. 5 is a diagram showing recording timing in the second embodiment. In FIG.
Reference numerals 7, 11, 18, and 19 are the same as those in the conventional example shown in FIG. The track configuration on the disk is the same as in FIG.
Also, 101 to 109 and 111 to 114 are the same as those in the first embodiment shown in FIG. Reference numeral 401 denotes a threshold variable unit, and reference numeral 402 denotes a threshold command. The second embodiment operates basically in the same manner as the first embodiment, except that a first threshold value indicating recording start and a second threshold value indicating recording stop change. . That is, in FIG. 4, the threshold changing unit 401 sends a threshold command 402 to the read address generating unit 105 according to the recording position, and changes the first and second thresholds. FIG.
(C) operates similarly to the first embodiment shown in FIG.
In FIG. 5D, since the first threshold value has changed to 521, the amount of recording data per time increases, and the data of the memory unit 101 is smaller than that of the first embodiment shown in FIG. The amount of change is large, and recording and track jumping for four consecutive clusters are repeated. At the outer peripheral portion where the transfer rate increases, the number of recording and recording stops is reduced from that in the first embodiment, and the number of track jumps is reduced. Can be reduced.

As described above, according to the second embodiment of the present invention, an empty sector is generated in the inner and outer peripheral portions having different transfer rates by using the MCAV optical disk to transfer the input digital information at a constant signal rate. Thus, it is possible to efficiently perform recording without reducing the number of track jumps in the outer peripheral portion and realize a stable operation.

FIGS. 6 and 7 show a third embodiment of the present invention. In the third embodiment, in addition to the first and second embodiments, PL
This is a case where the transfer clock is arbitrarily changed using L.

FIG. 6 is a diagram showing the configuration of a recording apparatus according to the third embodiment of the present invention. In FIG.
Reference numerals 7, 11, 18, and 19 are the same as those in the conventional example shown in FIG. Further, 101 to 108 and 111 to 114 are the same as those in the first embodiment shown in FIG. 601 is a reference clock generating means, 602 is a reference clock, 603 is a phase comparing means, 604 is a loop filter, 605 is a voltage controlled oscillation means, 607 is a variable frequency dividing means for dividing the transfer clock 110 by N, and 608 is a frequency dividing means An output signal 607, a dividing ratio setting unit 609 for setting a dividing ratio for the variable dividing unit 607, and a dividing ratio command 610.

The operation of the disk recording apparatus of the present embodiment configured as described above will be described below with reference to FIGS. 6 and 7. 6, a loop filter 604 is connected between a phase comparison unit 603 and a voltage controlled oscillation unit 605 with a reference clock 602 as an input. The output signal of the voltage controlled oscillator 605 is applied to the variable frequency divider 607 to be divided, and the frequency and the phase of the reference clock 602 are compared. By the above operation, the transfer clock 11 obtained as the output of the voltage control oscillation means 605
0 is N times the frequency of the reference clock 602. The frequency division ratio setting means 609 acts to increase the frequency division ratio on the outer peripheral side of the optical disc 1, and the variable frequency division means 607
Is added to the frequency division ratio command 610. Variable frequency dividing means 60
7 divides the transfer clock 110 according to the division ratio command 610.

FIG. 7 shows the operation of the frequency division ratio setting means 609. Although the frequency of the reference clock 602 is constant, the frequency division ratio setting means 609 increases the frequency division ratio in steps of N1, N2,. Set to. Accordingly, transfer clock 1
The frequency of 10 rises in n stages of f1, f2,..., Fn. As a result, as shown in FIG. 7, the transfer clock 110 is varied according to the radius of the optical disk 1 and rises on the outer peripheral side of the optical disk 1. Other operations are first
This is the same as the embodiment.

As described above, according to the third embodiment of the present invention, input digital information at a constant signal rate is transferred to the MCAV optical disk without generating empty sectors even at the inner and outer peripheral portions having different transfer rates. It is possible to record efficiently, externally set the frequency of the transfer clock arbitrarily, and change the transfer clock according to the radius of the optical disc 1.

FIGS. 8 and 9 show a fourth embodiment of the present invention. In the fourth embodiment, a transfer clock 110 is generated based on a synchronous clock extracted from a sector of an MCAV optical disk, and an input digital signal having a constant signal rate is stably recorded without lowering the use efficiency of a recording area. Is the case.

FIG. 8 shows a sector format (ISO, DP1008) of an optical disk used in the fourth embodiment of the present invention.
9) is a format B using 4/15 modulation and sample servo method. FIG. 8A shows a sector configuration.
FIG. 8B shows a segment configuration, and FIG. 8C shows a configuration of a servo area. In FIG. 8, reference numeral 801 denotes a sector and the total data amount is 774 bytes;
01 is divided into 43 segments of 18 bytes each.
Reference numeral 3 denotes a preformatted servo area of the first two bytes, and reference numeral 804 denotes a data area. 805 is a servo byte 1 and 806 is a servo byte 2. In the sector format shown in FIG. 8, a synchronization clock for data writing and reading is obtained from the synchronization mark 807 of the servo byte 2 and, at the same time, a sampling signal for detecting the tide mark of the servo byte 1 is obtained, the tide mark 808 is sampled, and the tracking signal is obtained. obtain. As described above, the sample servo method is advantageous against the rotation fluctuation of the optical disc 1 because the clock is generated from the preformatted synchronization mark.

FIG. 9 is a diagram showing the configuration of a recording apparatus according to the fourth embodiment of the present invention. In FIG.
Reference numerals 7, 11, 18, and 19 are the same as those in the conventional example shown in FIG. Also, 101 to 109 and 111 to 114 are the same as those in the first embodiment shown in FIG. Reference numeral 901 denotes a servo signal which is obtained from the servo area shown in FIG. 8C, 902 denotes a synchronous clock extracting unit, and 903 denotes a synchronous clock extracted from the servo signal 901 by the synchronous clock extracting unit 902. The synchronous clock 903 is supplied to the timing control unit 109 and serves as a reference signal for generating the transfer clock 110. Others are the same as the first to third embodiments. In the fourth embodiment, the synchronous clock 903 is extracted from the preformatted servo signal, and the transfer clock 110 is generated by the synchronous clock 903, so that stable control can be realized.

As described above, according to the fourth embodiment of the present invention, the input digital information at a constant signal rate is transferred to the MCAV optical disk having a synchronous clock even at the inner and outer peripheral portions having different transfer rates. And the transfer clock 110 is generated by the synchronous clock 903, so that stable control can be realized.

In the fourth embodiment, the ISO / D
The format B of P10089 has been described as an example.
It goes without saying that the same applies to other formats as long as the optical disk has a synchronous clock.

As the timing control means 109,
As in the third embodiment, the phase comparator 603, the loop filter 604, the voltage controlled oscillator 605, the variable frequency divider 6
07 and a frequency division ratio setting means 609, and a synchronous clock 903 may be used instead of the reference clock 602.

FIGS. 10 to 11 show a fifth embodiment of the present invention. The fifth embodiment is a case where the input signal rate is recorded in a TOC (Table Of Contents) area in the first to fourth embodiments. When digital video information is compressed and recorded, there are cases where high resolution is required and cases where low resolution is sufficient. When the compression ratio changes according to the resolution, the signal rate of the digital video information recorded on the optical disc 1 changes. The fifth embodiment can be used when digital video information of various signal rates is recorded on the optical disc 1 as described above. FIG. 10 is a diagram showing the configuration of the fifth embodiment, and FIG. 11 is a diagram showing a track pattern of the optical disc 1 and a data array of the TOC in the fifth embodiment. As shown in FIG. 11, the optical disc 1 is divided into a TOC area 921 and an information area 922, input digital information is divided into predetermined sections and recorded in the information area 922, and a movie, for example, is stored in the TOC area 921. If so, the title number and its start address are recorded.
In addition, when the signal rate of the input digital information changes, the signal rate information is stored in the TOC area 921.
It should be recorded in. FIG. 10 is a diagram showing a configuration of a recording apparatus according to the fifth embodiment. In FIG.
4 to 7, 11, 18, and 19 are the same as the conventional example shown in FIG. Also, 101 to 106, 108, 111 to 11
4 is the same as that of the first embodiment shown in FIG. Reference numeral 911 denotes signal rate designating means, 912 denotes signal rate information, and 913 denotes recording means. In FIG. 11, 923 is a title number, and 924 is a start address. In FIG. 10, the signal rate of the input digital information is
11, the signal rate designating unit 911 supplies the signal rate information 912 to the recording unit 913. The recording means 913 adds an error correcting parity to the digital information 102, modulates the sector on the disk to generate a mark pattern, adds a synchronization signal, and records it in the information area 922 of the optical disk 1. The signal rate information 912 is recorded in the TOC area 921 of the optical disc 1 as shown in FIG. Thereby, the optical disk 1
Since the signal rate of the input digital information 11 to be recorded can also be recorded thereon, the input digital information having an arbitrary signal rate can be recorded.

As described above, according to the fifth embodiment of the present invention, when recording an input digital signal having a constant signal rate on an MCAV optical disc, it is possible to record input digital information having an arbitrary signal rate. it can.

FIGS. 12 and 13 show a sixth embodiment of the present invention. The sixth embodiment is a prerecorded MCA having a pit format of an MCAV optical disk or an equivalent data structure recorded by the recording apparatus shown in the first to fifth embodiments.
This is a case where a V optical disc is reproduced. FIG. 12 is a diagram showing the configuration of an apparatus for reproducing digital information from an optical disk according to the sixth embodiment of the present invention. In FIG.
1, 4 to 7, 18, and 19 are the same as the conventional example shown in FIG. Also, 101, 103 to 106, 109 to 112
Is the same as the first embodiment shown in FIG. 931 is a reproduction signal reproduced from the optical disc 1, 932 is reproduction means,
933 is digital information output from the reproducing means 932, 934 is output digital information output from the memory means 101, 935 is reproduction instruction means, and 936 is a reproduction instruction.

The operation of the disk reproducing apparatus of the present embodiment configured as described above will be described below with reference to FIGS. In this case, the optical disk 1
Digital information is continuously recorded on the
It is assumed that the signal rate of the digital information in 1 is equal to or higher than the signal rate of the output digital information 934. In FIG. 12, a reproduction signal 931 is a reproduction unit 932.
, Demodulated and error-corrected, and output as reproduced digital information 933. Reproduction digital information 93
3 is written to the memory means 101 by the write address 104 and read by the read address 106 generated according to the signal rate of the output digital information 934. The tracking control means 111 causes the optical head 4 to track on the track 2 of the optical disk 1. The spindle control means 5 rotates the optical disc 1 at a substantially constant angular velocity. The write address 104 and the read address 106 are input to the reproduction command means 935. The reproduction command means 935 obtains the difference between the write address 104 and the read address 106, compares the difference signal with a predetermined threshold value, and uses the output as a reproduction command 936 as the write address generation means 103, the tracking control means 111, Output to means 932. The writing speed of the reproduction digital information 933 to the memory means 101 is determined by the transfer clock 11
It is determined based on 0.

FIG. 13 shows the reproduction timing from when the reproduction signal is reproduced from the optical disk to when the output digital information 934 is obtained. In FIG. 13, reference numeral 942 denotes a third threshold indicating the start of reproduction, and reference numeral 941 denotes a fourth threshold indicating the stop of reproduction. The reproduced digital information 933 is written into the memory means 101 by the write address 104 generated according to the rate of the transfer clock 110, and is read by the read address 106 generated at the timing of the output digital information 934. At this time, the rate of the digital information in the reproduction signal 931 is equal to or higher than the signal rate of the output digital information 934, so that the writing speed of the digital information to the memory means 101 is equal to or higher than the reading speed.
When the digital read speed is equal to the write speed as shown in FIG. 13B, the data capacity in the memory means 101 is constant. When the write speed is higher than the read speed as shown in FIGS.
The data capacity in the memory means 101 will increase by the difference between the writing speed and the reading speed. In any case, a predetermined threshold value is set, a difference between the write address 104 and the read address 106 is obtained, and when the difference becomes equal to or less than a third threshold value 942 indicating the start of reproduction, a reproduction command is issued. 936, the write address generating means 1
Operation 03 is started, and writing of digital information to the memory means 101 is started. On the other hand, when the difference between the write address 104 and the read address 106 is equal to or greater than the fourth threshold value 941 indicating that reproduction is stopped, the operation of the write address generation unit 103 is stopped by the reproduction command 936, and Is stopped, and at the same time, a reproduction command 936 is sent to the tracking control means 111 to cause the optical head 4 to jump one track. During one rotation of the disk after the track jump, the data capacity in the memory means 101 decreases, and when the data capacity becomes equal to or less than the third threshold value 942, the reproducing operation is started again. The third threshold 942 and the fourth threshold 941 are each set to a constant value. 12, a write address 104 is generated based on a transfer clock 110. Since the frequency of the transfer clock 110 increases stepwise as the optical head 4 moves from the inner circumference to the outer circumference of the optical disc 1, the memory means 1
When the optical head 4 moves from the inner circumference to the outer circumference of the optical disc 1, the speed at which the reproduced digital information 933 is written to the optical disc 1 also increases in accordance with the transfer clock.

As described above, according to the sixth embodiment of the present invention, the digital information continuously recorded on the MCAV optical disc is transferred at a constant signal rate even at the inner and outer peripheral portions having different transfer rates. It can be reproduced as information.

FIGS. 14 and 15 show a seventh embodiment of the present invention. The seventh embodiment is a pre-recorded MCAV having an MCAV optical disk or an equivalent data structure in a pit format recorded by the recording apparatus shown in the first to fifth embodiments.
This is a case where the threshold value is varied when reproducing an optical disk.

FIG. 14 is a diagram showing a configuration of a reproducing apparatus according to a seventh embodiment of the present invention, and FIG. 15 is a diagram showing reproducing timing. In FIG. 14, reference numerals 1, 4 to 7, 18, and 19 are the same as those in the conventional example shown in FIG. Also, 101, 10
3 to 106, 109 to 112 are the same as those in the first embodiment shown in FIG. 1, and 401 and 402 are the same as those in the second embodiment. Reference numerals 931 to 936 are the same as those in the sixth embodiment shown in FIG. The seventh embodiment operates basically in the same manner as the sixth embodiment, except that the third threshold value indicating the start of reproduction and the fourth threshold value indicating the stop of reproduction change. . That is, in FIG.
01 sends a threshold value command 402 to the write address generating means 103 in accordance with the reproduction position, and a third signal indicating the start of reproduction.
And the fourth threshold value indicating the stop of reproduction are changed. FIGS. 15A to 15C are the same as FIGS. 13A to 13C, but in FIG.
Since it has changed to 50, the amount of reproduced data per time increases. Other operations are the same as those in FIGS.
Thereby, the number of track jumps can be reduced in the outer peripheral portion where the transfer rate increases and the number of times of reproduction and reproduction stop increases.

As described above, according to the seventh embodiment of the present invention, digital information recorded on an MCAV optical disk is reproduced as digital information having a constant signal rate even at the inner and outer peripheral portions having different transfer rates. In addition, it is possible to reduce the number of track jumps in the outer peripheral portion and realize a stable operation.

FIG. 16 shows an eighth embodiment of the present invention. In the eighth embodiment, a transfer clock is generated by extracting a synchronization clock from an MCAV optical disc. The sector format of the optical disc used in the eighth embodiment is the fourth format.
And the configuration shown in FIG.

FIG. 16 is a diagram showing a configuration of a reproducing apparatus according to the eighth embodiment of the present invention. In FIG. 16, 1, 4
7, 8, and 19 are the same as the conventional example shown in FIG.
Also, 101, 103 to 106 and 109 to 112 are shown in FIG.
Is the same as the first embodiment shown in FIG. Reference numerals 931 to 936 are the same as those in the sixth embodiment shown in FIG. Reference numeral 951 denotes a servo signal; 952, a synchronous clock extracting unit; and 953, a synchronous clock extracted from the synchronous clock extracting unit. The synchronous clock 953 is supplied to the timing control unit 109 and serves as a reference signal for generating a transfer clock. Others are 6th ~
This is the same as the seventh embodiment. In the eighth embodiment,
Since the transfer clock is generated based on the synchronous clock 953 extracted from the optical disc 1, stable control can be realized.

As described above, according to the eighth embodiment of the present invention, the digital information recorded on the MCAV optical disk having the synchronous clock is transferred to the inner peripheral portion having different transfer rates.
It is also possible to reproduce digital information at a constant signal rate in the outer peripheral portion and realize stable control based on a synchronous clock extracted from the optical disk.

FIG. 17 shows a ninth embodiment of the present invention. The ninth embodiment is for reproducing an MCAV optical disk recorded by the recording apparatus shown in the first to fifth embodiments or a pre-recorded MCAV optical disk having an equivalent data structure in a pit format. This is the case where playback is performed from In FIG. 17, 1, 4 to 7, 1
8 and 19 are the same as the conventional example shown in FIG. Also, 1
03 to 104, 109 to 112 are the same as those in the first embodiment shown in FIG. Reference numeral 961 denotes signal rate extracting means for extracting the reproduced signal, and 962 denotes signal rate information. FIG.
In, the signal rate of the output digital information 934 is read by the signal rate extracting means 961, and the signal rate information 962 is supplied to the read address generating means 965. The read address generation unit 965 generates a read address 966 according to the signal rate information 962, and reads output digital information from the memory unit 101. This makes it possible to reproduce the output digital information from the digital information recorded on the optical disc 1 at the signal rate specified on the TOC.

As described above, according to the ninth embodiment of the present invention, the digital information recorded on the MCAV optical disk is digitally converted at the specified signal rate even at the inner and outer peripheral portions having different transfer rates. Information can be reproduced.

In the first to ninth embodiments, the same applies to audio information as well as video information as an input digital signal.

In the first to fifth embodiments, light modulation has been described as an example. However, the same holds when recording is performed using the magneto-optical effect. In this case, at the time of recording, the difference is that the recording signal is applied not to the optical head but to the magnetic head as shown in FIG. In FIG. 18, reference numeral 971 denotes a magnetic head, 972 denotes a magnetic head driving unit, and 973 denotes an optical head driving signal. The recording signal 108 is applied not to the optical head 4 but to the magnetic head 971. The tracking control unit 111 performs on-track and off-track of the magnetic head 971 on the track 2 together with the optical head 4.
Others are the same as those of the first to fifth embodiments. On the other hand, at the time of reproduction, a reproduction signal is read from the optical disk 1 utilizing the magneto-optical effect, which is the same as in the sixth to ninth embodiments.

[0062]

As is clear from the above embodiment, the first embodiment
According to this embodiment, it is possible to efficiently record input digital information at a constant signal rate on an MCAV optical disc without generating empty sectors even at inner and outer peripheral portions having different transfer rates.

Further, according to the second embodiment, input digital information at a constant signal rate is efficiently recorded on an MCAV optical disk without generating empty sectors even at inner and outer peripheral portions having different transfer rates. In addition, it is possible to reduce the number of track jumps in the outer peripheral portion and realize a stable operation.

According to the third embodiment, when an input digital signal at a constant signal rate is recorded on an MCAV optical disc, the frequency of a transfer clock is set arbitrarily from the outside, and the transfer rate is set to the radius of the optical disc 1. Accordingly, recording can be efficiently performed without generating empty sectors even in the inner peripheral portion and the outer peripheral portion having different transfer rates.

In the fourth embodiment, when an input digital signal having a constant signal rate is recorded on an MCAV optical disk having a synchronous clock, a more stable transfer clock is generated by using the synchronous clock extracted from the optical disk as a reference. Control becomes possible, and efficient recording can be performed without generating empty sectors even in the inner and outer peripheral portions having different transfer rates.

According to the fifth embodiment, when an input digital signal having a constant signal rate is recorded on an MCAV optical disc, input digital information having an arbitrary signal rate can be recorded together with the signal rate.

According to the sixth embodiment, digital information having a constant signal rate is continuously converted into digital information having a constant signal rate even at inner and outer peripheral portions having different transfer rates from a continuously recorded MCAV optical disk. It is possible to play.

According to the seventh embodiment, digital information of a constant signal rate is continuously converted from a continuously recorded MCAV optical disc into digital information of a constant signal rate even at the inner and outer peripheral portions having different transfer rates. Play and
In addition, it is possible to reduce the number of track jumps and realize a stable operation even in the outer peripheral portion.

In the eighth embodiment, digital information of a constant signal rate is continuously transferred from a continuously recorded MCAV optical disk by generating a transfer clock based on a synchronous clock extracted from the optical disk. Control becomes possible, and it is possible to reproduce digital information at a constant signal rate even in the inner peripheral portion and the outer peripheral portion having different transfer rates.

According to the ninth embodiment, when a digital signal having a fixed signal rate is reproduced from a continuously recorded MCAV optical disc, the signal rate is changed when reproducing digital information having a designated signal rate. Can be identified and played.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a disk recording device according to a first embodiment of the present invention.

FIG. 2 is a timing chart for explaining a recording operation of the first embodiment.

FIG. 3 is a schematic diagram showing a state of recording on a track on a disk in the first embodiment.

FIG. 4 is a block diagram showing a configuration of a disk recording device according to a second embodiment of the present invention.

FIG. 5 is a timing chart for explaining the recording operation of the second embodiment.

FIG. 6 is a block diagram showing a configuration of a disk recording device according to a third embodiment of the present invention.

FIG. 7 is a timing chart for explaining the recording operation of the third embodiment.

FIG. 8 is a schematic diagram showing a sector configuration according to a fourth embodiment of the present invention.

FIG. 9 is a block diagram showing a configuration of a disk recording device in the fourth embodiment.

FIG. 10 is a block diagram showing a configuration of a disk recording device according to a fifth embodiment of the present invention.

FIG. 11 is a schematic diagram showing tracks and TOC on a disk according to the fifth embodiment.

FIG. 12 is a block diagram showing a configuration of a disc reproducing apparatus according to a sixth embodiment of the present invention.

FIG. 13 is a timing chart for explaining the reproduction operation of the sixth embodiment.

FIG. 14 is a block diagram showing a configuration of a disc reproducing apparatus according to a seventh embodiment of the present invention.

FIG. 15 is a timing chart for explaining the reproducing operation of the seventh embodiment.

FIG. 16 is a block diagram showing a configuration of a disc reproducing apparatus according to an eighth embodiment of the present invention.

FIG. 17 is a block diagram illustrating a configuration of a disc reproducing apparatus according to a ninth embodiment of the present invention.

FIG. 18 is a schematic diagram showing another configuration of the recording head in the first to fifth embodiments.

FIG. 19 is a schematic view showing a track pattern on a conventional disk.

FIG. 20 is a block diagram showing a configuration of a conventional disk recording / reproducing apparatus.

FIG. 21 is a timing chart showing the relationship between a recording position, a transfer rate, and a recording mark length in a conventional MCAV optical disc.

[Explanation of symbols]

 Reference Signs List 101 memory means 103 write address generation means 105 read address generation means 107 recording means 109 timing control means 110 transfer clock 113 recording command means

──────────────────────────────────────────────────続 き Continuing on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location G11B 27/00 D (72) Inventor Tetsushi Kasahara 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. In-company (72) Inventor Hiroo Oikawa 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. Document JP-A-62-80865 (JP, A) JP-A-3-205620 (JP, A)

Claims (7)

(57) [Claims] 1. A rotation control means for rotating an optical disk having a sector obtained by dividing a spiral or concentric track at a substantially constant angular velocity, generating a transfer clock, and increasing the frequency of the transfer clock toward the outer periphery of the optical disk. and timing control means for, memory means for storing the input digital information having a constant signal rate, said memory means the write address said input digitally
A write address generating means for generating at a speed proportional to the signal rate Le information, the reading speed of the digital information from said memory means to generate a read address of said memory means in accordance with the recording instruction in accordance with the frequency of the transfer clock a read address generating means for varying its value reads the difference between the write address and the read address is the read in the case of more than the first threshold value
The above digital information to the output address generation means.
Instruct to read from memory means and record
Is generated, and when the value is equal to or less than a second threshold value , the memory is transmitted to the read address generation means.
When reading of the digital information from the means is stopped
Finger and recording command generating means for outputting said recording command together for instructing the recording stop, the optical head is on-track to the track when the recording command for instructing recording, the recording command is a recording stop
Tracking control means for causing the optical head to perform a track jump, and recording means for recording digital information read from the memory means on the optical disk at a timing according to the frequency of the transfer clock in accordance with the recording instruction. Disk recording device. 2. A rotation control means for rotating an optical disk having a sector obtained by dividing a spiral or concentric track at a substantially constant angular velocity, and a reference clock output from a reference clock generation means and an output of a voltage controlled oscillation means set to N. The output obtained through the variable frequency dividing means for dividing the frequency is input to the phase comparing means, the output of the phase comparing means is input to the voltage controlled oscillating means through a loop filter, and the transfer obtained as the output of the voltage controlled oscillating means is obtained. Timing control means for increasing the frequency of the clock toward the outer circumference of the optical disc; frequency division ratio setting means for instructing the variable frequency division means to divide the frequency; and memory means for storing input digital information having a constant signal rate. The write address of the memory means is input to the input
A write address generating means for generating at a speed proportional to the signal rate Le information, the reading speed of the digital information from said memory means to generate a read address of said memory means in accordance with the recording instruction in accordance with the frequency of the transfer clock a read address generating means for varying its value reads the difference between the write address and the read address is the read in the case of more than the first threshold value
The above digital information to the output address generation means.
Instruct to read from memory means and record
Is generated, and when the value is equal to or less than a second threshold value , the memory is transmitted to the read address generation means.
When reading of the digital information from the means is stopped
Finger and recording command generating means for outputting said recording command together for instructing the recording stop, the optical head is on-track to the track when the recording command for instructing recording, the recording command is a recording stop
Tracking control means for causing the optical head to perform a track jump, and recording means for recording digital information read from the memory means on the optical disk at a timing according to the frequency of the transfer clock in accordance with the recording instruction. Equipped disk recording device. 3. The apparatus according to claim 1, further comprising: synchronous clock extracting means for extracting a synchronous clock from a synchronous signal area of said sector; and said timing control means for generating said transfer clock based on said synchronous clock. The disk recording device according to any one of the preceding claims. 4. A signal rate designating means for designating a signal rate, an information area divided into predetermined sections for recording the input digital information, a section number of the section, and a start address of the section. The signal rate information generated by the signal rate designating means is recorded in the TOC area on the optical disk having the TOC area together with the section number and the start address of the section, and is read from the memory means in the information area. 4. The disk recording apparatus according to claim 1, further comprising recording means for recording digital information. 5. A rotation control means for rotating an optical disk having a sector obtained by dividing a spiral or concentric track at a substantially constant angular velocity, and a signal from the optical disk whose frequency increases toward the outer periphery using an optical head. Reproduction means for reproducing the data; timing control means for supplying a predetermined transfer clock to the reproduction means to increase the frequency of the transfer clock toward the outer periphery of the optical disc; and storing reproduction digital information reproduced from the reproduction means. A write address generating means for generating a write address of the memory means in accordance with a reproduction command and changing a writing speed of digital information to the memory means in accordance with a frequency of the transfer clock; Read address generation means for generating an address , The value read the difference between the write address and the read address is the read if: the third threshold value
From the memory means to the output address generation means.
Stop reading digital information and repeat
The reproducing means is instructed to the reproducing means.
Command to read file information from the memory means
A reproduction command generating means for outputting the reproduction command for instructing the reproduction means to stop reproduction, and when the reproduction command instructs the reproduction, the optical head is turned on the track and the reproduction command is
A disc reproducing apparatus comprising: a tracking control unit for causing the optical head to jump to a track when instructing a reproduction stop . 6. The disk reproducing apparatus according to claim 5, further comprising: a synchronous clock extracting unit that extracts a synchronous clock from a synchronous signal area of the optical disk; and a unit that generates the transfer clock based on the synchronous clock. apparatus. 7. The TOC area on the optical disc having an information area divided into predetermined sections for recording input digital information, and a TOC area for recording a section number of the section and a start address of the section. 7. The disk according to claim 5, further comprising: signal rate extracting means for extracting signal rate information from the memory; and read address generating means for changing a reading speed of the memory means based on the extracted signal rate information. Playback device.