JPH08339631A - Optical disk reproducer - Google Patents

Abstract

PURPOSE: To be able to multiple reproduce the data of two systems relating to one another. CONSTITUTION: The front 2-channel digital stereo music signals of 4-channel sound music signals of a set of adjacent groups 2A and land 2B in an optical disk 1 are as DA in the group 2A and the rear 2-channel digital stereo music signals are as DB in the land 2B are recorded by simultaneous readable record marks 3 according to CD format. The record marks 3 of the adjacent group 2A1 and land 2B1 of the disk 1 are simultaneously detected by an optical pickup 10 and an RF amplifier 20, the signal DA recorded in the group 2A1 is demodulated by a first digital signal processor 30, and the signal DB recorded by the group 2B1 is demodulated by a second digital signal processor 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk reproducing apparatus, and more particularly to an optical disk such as a phase change optical disk in which land and groove on the same surface are used as separate tracks and information which can be simultaneously read by recording marks is recorded on each track. The present invention relates to an optical disc reproducing device for reproducing a disc.

[0002]

2. Description of the Related Art There are various types of optical discs depending on the recording method. For example, a pit type in which recording marks are formed by pits, the polarization plane of reflected light rotates in the opposite direction when the direction of magnetization is changed (Kerr effect). ) Is used to form a recording mark, and a phase change formula is used to form a recording mark by utilizing a difference in reflectance of 10% to 30% between a crystalline state and an amorphous state. is there. Also,
The difference in structure is that there is a track groove and that there is no track groove.

In recent years, in such an optical disc, research and development of high density have been actively conducted in order to record a large amount of data. One of the methods for increasing the density is an optical disc having a groove portion, in which a land portion between the groove portions is set as a track different from the groove portion and a recording mark can be recorded in each of the groove portion and the land portion. .. This kind of high density is difficult with the pit type, but relatively easy with the magneto-optical type and the phase change type, and by designing the groove portion to an appropriate depth for the laser wavelength of the pickup, It has been found that the influence of crosstalk due to the recording marks of the adjacent land (groove part) can be reduced when reading the land part, and that the recording mark can be demodulated reliably (The Phase Change Recording Research of the Japan Society of Applied Physics). Proceedings of the 1993 Symposium on the 5th Phase Change Recording Research Group, pp. 114-119, "High Density Phase Change Optical Disks with Land and Groove Recording").

Further, with respect to a magneto-optical disk, laser beams of two different wavelengths are coaxially superposed by an optical system and then incident on the magneto-optical disk. At this time, the short-wavelength beam is used as a spot diameter for recording / reproducing a recording mark. Is a groove part or a land part or less, and the long-wavelength beam has a spot diameter of not less than the groove part or the land part for tracking error detection, thereby destroying a recording mark of an adjacent land part (groove part) during recording, Proposals have also been made to prevent the influence of crosstalk due to recording marks of adjacent land portions (groove portions) at the time of reproduction so that recording and reproduction can be performed for both the groove portion and the land portion (special feature). See Kaihei 3-263637).

[0005]

As described above, the recording density can be increased by recording the recording marks on both the land portion and the groove portion in the optical disc. However, in this high-density recording method, the land portion and the groove portion are independent recording areas, and data related to each other in the land portion and the groove portion are recorded and not simultaneously reproduced. It was Therefore, while the recorded data of the land portion is being reproduced, the recorded data of the groove portion is not reproduced, and conversely, the recorded data of the land portion is not reproduced while the recorded data of the groove portion is reproduced. Therefore, the recording rate is not changed and the recording capacity is merely doubled.

In this regard, both sides of the optical disk are targeted for recording, and at the time of recording, high-rate digital image data is divided into two phases, error correction codes and synchronization signals are added and modulated in parallel for each phase, The pair of optical pickups simultaneously record the recording marks on both sides of the optical disc, and at the time of reproduction, the pair of optical pickups simultaneously detect the recording marks from both sides of the optical disc, and demodulate and synchronize in parallel for each phase. There is a proposal to double the transmission rate by performing error correction and combining two phases into one phase and outputting (see Japanese Patent Laid-Open No. 6-2.
(See Japanese Patent No. 36626). However, this proposal does not densify one side of the optical disc, and the correct recording / reproducing operation cannot be performed unless the access positions of the pair of optical pickups are aligned on the lower and upper surfaces of the optical disc. There is a problem that it is very difficult to match the access position of the optical pickup with respect to the optical disc.

The present invention provides a novel reproducing apparatus for an optical disc in which the recording marks are recorded on both the land portion and the groove portion on the same surface, and specifically, a reproducing apparatus for two systems is provided. It is an object of the present invention to provide an optical disk reproducing apparatus capable of multiplex reproducing data. It is another object of the present invention to provide an optical disk reproducing apparatus capable of performing multiplex reproduction in synchronization with each other even if two lines of data are recorded on the optical disk at physically displaced positions. It is another object of the present invention to provide an optical disk reproducing device that can easily reproduce data with a high sampling frequency. It is another object of the present invention to provide an optical disc reproducing apparatus capable of accurately reproducing data having a high sampling frequency regardless of the deviation of the recording position between the land portion and the groove portion. It is another object of the present invention to provide an optical disc reproducing device that can easily reproduce data with high quantization accuracy. It is another object of the present invention to provide an optical disc reproducing apparatus capable of reproducing data with high quantization accuracy accurately regardless of the deviation of the recording position between the land portion and the groove portion.

[0008]

In the optical disk reproducing apparatus of the present invention, an optical disk in which data of two systems related to each other are recorded in a land and a groove part which are adjacent to each other with record marks which can be simultaneously read. And a recording mark detecting means for simultaneously detecting recording marks recorded on the land portion and the groove portion of the optical disc, and a demodulator for outputting the data recorded on the land portion from the detection output of the recording mark detecting means. It is characterized by including demodulation means and second demodulation means for demodulating and outputting the data recorded in the groove portion from the detection output of the recording mark detection means. Further, another optical disk reproducing apparatus of the present invention is characterized in that it is provided with mixing means for mixing the output of the first demodulating means and the output of the second demodulating means.

Further, in still another optical disk reproducing apparatus of the present invention, two systems of data which are related to each other, one system each,
A recording mark detecting means for simultaneously detecting recording marks recorded on a land portion and a groove portion of the optical disc for an optical disc recorded with recording marks which can be simultaneously read on a land portion and a groove portion which are adjacent to each other together with recording position information. A first demodulation means for demodulating and outputting the data and recording position information recorded in the land portion from the detection output of the recording mark detection means; and data recorded in the groove portion and recording from the detection output of the recording mark detection means. Using the second demodulation means for demodulating and outputting the position information and the recording position information demodulated from the land part and the recording position information demodulated from the groove part, the demodulation output from the land part and the demodulation output from the groove part are synchronized. It is characterized by having a synchronizing means for taking. Further, another optical disk reproducing apparatus of the present invention is characterized by including a mixing means for mixing the two outputs of the synchronizing means.

Further, in another optical disk reproducing apparatus of the present invention, a sample data string of sampling frequency 2F _s is set to 1
Every other two systems, each of which has a sample data string of the sampling frequency F _s , one system, and an optical disk recorded with record marks that can be simultaneously read on the land portion and the groove portion which are adjacent to each other As the first, the recording mark detecting means for simultaneously detecting the recording marks recorded on the land portion and the groove portion of the optical disc, and the demodulated sample data sequence recorded on the land portion from the detection output of the recording mark detecting means are outputted. Demodulation means, second demodulation means for demodulating and outputting the sample data sequence recorded in the groove portion from the detection output of the recording mark detection means, sample data demodulated by the first demodulation means and second demodulation means. And a synthesizing means for arranging the sampled data alternately and synthesizing and outputting a sampled data string of sampling frequency 2F _s. It is characterized by. Further, in another optical disk reproducing apparatus of the present invention, the sampling frequency 2
Every other sample data string of F _s is distributed to two systems, and one sample data string of sampling frequency F _s is read from each of the two systems at the same time with the recording position information in the adjacent land and groove parts. Targeting an optical disc recorded with possible recording marks, recording mark detection means for simultaneously detecting the recording marks recorded on the land portion and the groove portion of the optical disc, and recording on the land portion from the detection output of the recording mark detection means First demodulation means for demodulating and outputting the sample data sequence and recording position information, and second demodulation means for demodulating and outputting the sample data sequence and recording position information recorded in the groove portion from the detection output of the recording mark detecting means. Means, using the recording position information demodulated from the land portion and the recording position information demodulated from the groove portion,
A synchronizing means for synchronizing the sample data sequence demodulated from the land part and the sample data sequence demodulated from the groove part,
The synthesizing means alternately arranges the two-system sample data synchronized by the synchronizing means and synthesizes and outputs the sample data string of the sampling frequency 2F _s .

In another optical disk reproducing apparatus of the present invention, a sampling frequency F _s , a sample data string in which one sample data has an n-bit length, each sample data has an m-bit length and (n -M) By allocating to two sub-sample data of bit length,
The optical disc land is divided into two sub-sample data strings, and the two sub-sample data strings are recorded one by one in the land portion and the groove portion which are adjacent to each other by the simultaneously readable recording marks. Mark detecting means for simultaneously detecting the recording marks recorded in the groove portion and the groove portion, and first demodulating means for demodulating and outputting the sub-sampled data sequence recorded in the land portion from the detection output of the recording mark detecting means, Second demodulation means for demodulating and outputting the sub-sample data sequence recorded in the groove part from the detection output of the recording mark detecting means, and sub-sample data demodulated from the land part and sub-sample data demodulated from the groove part are combined. And a synthesizing means for outputting an original sample data string of n-bit length. Further, in another optical disk reproducing apparatus of the present invention,
For a sampling frequency F _s , for a sample data string in which one sample data has an n-bit length, each sample data is divided into two sub-sample data of an m-bit length and a (n−m) -bit length according to a bit position. The optical disc is divided into two systems of sub-sampled data sequences, and the two systems of sub-sampled data sequences are recorded one by one with recording position information in the land and groove portions adjacent to each other with simultaneously readable record marks. As a recording mark detecting means for simultaneously detecting the recording marks recorded in the land portion and the groove portion of the optical disc, and a sub-sampled data sequence of m-bit length unit recorded in the land portion from the detection output of the recording mark detecting means and recording. First demodulating means for demodulating and outputting the position information, and detection output of the recording mark detecting means to the groove part. The second demodulation means for demodulating and outputting the recorded sub-sampled data sequence of (nm) bit length unit and recording position information, the recording position information demodulated from the land part and the recording position information demodulated from the groove part. Using the sub-sampled data sequence demodulated from the land part and the sub-sampled data sequence demodulated from the groove part, the synchronization means for synchronizing the two systems of sub-sampled data output from the synchronization means are combined to generate the original n bits. And a synthesizing means for outputting a long sample data string. Further, in another optical disk reproducing apparatus of the present invention, n-bit length sample data MSB, 3SB, 5SB ... Are combined into one sub-sample data, and n-bit length sample data 2SB, 4SB, 6SB. · Combining ··· with one other sub-sampled data,
Is characterized by.

[0012]

According to the optical disk reproducing apparatus of the present invention, recording mark detection is performed for an optical disk in which two lines of data are recorded in adjacent land portions and groove portions at the same time with readable recording marks. The recording marks recorded on the land portion and the groove portion adjacent to each other of the optical disc are simultaneously detected by using the means, and the data recorded on the land portion and the groove portion are recorded by the first and second demodulating means from the detection output. The demodulated data is output. As a result, multiple reproduction of data of two systems is possible, and advanced reproduction such as reproduction of multi-channel surround music, reproduction of stereo accompaniment and stereo vocal, etc., becomes possible. Simultaneous reading of recording marks from the adjacent land portion and groove portion on one side of the optical disc can be performed by one recording mark detecting means (optical pickup) that emits a plurality of laser beams, and a plurality of recording mark detecting means can be obtained. It is not necessary to adopt the difficult structure of aligning the access position of each recording mark detecting means with respect to the optical disc as in the case of using the. Further, according to another optical disk reproducing apparatus, the two demodulation outputs are mixed by the mixing means. As a result, it is possible to easily cope with a reproducing system having only one system of output means.

Further, according to still another optical disk reproducing apparatus, when the data of each system is recorded on the optical disk together with the recording position information, the first and second demodulating means detect the land from the detection output of the recording mark detecting means. The data recorded in the groove portion and the data recorded in the groove portion are demodulated and output together with the recording position information, and the synchronizing means uses the recording position information demodulated from the land portion and the recording position information demodulated from the groove portion. Then, the demodulation output from the land portion and the demodulation output from the groove portion are synchronized. As a result, even if the two systems of data are recorded on the optical disc at physically displaced positions, the multiple reproduction can be performed in synchronization.
Further, according to another optical disk reproducing apparatus, the mixing means mixes the two outputs of the synchronizing means. As a result, it is possible to easily cope with a reproducing system having only one system of output means.

According to another optical disk reproducing apparatus,
A recording mark capable of being simultaneously read out to adjacent land portions and groove portions, in which every two sample data sequences having a sampling frequency of 2F _s are distributed to two systems, and the sample data sequences having a sampling frequency F _s of the two systems are one system at a time. Targeting the optical disc recorded in 1., the recording marks recorded on the land portion and the groove portion adjacent to each other of the optical disc are simultaneously detected by using the recording mark detection means, and the first and second demodulation means detect the detected output. The sample data sequence of the sampling frequency F _s recorded in the land part and the sample data sequence of the sampling frequency F _s recorded in the groove part are demodulated, and the sample data of each system are alternately arranged by the synthesizing means to obtain the sampling frequency. Output a 2F _s sample data string. As a result, data with a high sampling frequency can be easily reproduced without reducing the size of the recording mark or doubling the rotation speed of the optical disc. Further, according to another optical disk reproducing apparatus, when the sample data string of each system is recorded on the optical disk together with the recording position information, the first and second demodulating means move from the detection output of the recording mark detecting means to the land portion. The recorded sample data sequence and the sample data sequence recorded in the groove part are demodulated and output together with the recording position information, and the synchronization position demodulates the recording position information demodulated from the land part and the recording position information demodulated from the groove part. Using,
The demodulation output from the land part and the demodulation output from the groove part are synchronized. Then, the synthesizing means alternately synthesizes the sample data of the two systems. As a result, even if the sample data strings of the two systems are recorded on the optical disc at positions that are physically deviated, they can be combined at the correct positions, regardless of the deviation of the recording position between the land portion and the groove portion. , Can accurately reproduce data with a high sampling frequency.

According to another optical disk reproducing apparatus,
For a sampling frequency F _s , for a sample data string in which one sample data has an n-bit length, each sample data is divided into two sub-sample data of an m-bit length and a (n−m) -bit length according to a bit position. Recording marks for an optical disc in which sub-sampling data strings of two systems are divided, and one recording system of the sub-sampling data strings of the two systems is recorded on adjacent land portions and groove portions with simultaneously readable recording marks. The recording means recorded on the land portion and the groove portion which are adjacent to each other on the optical disc are simultaneously detected by using the detecting means, and the sub-sample data string recorded on the land portion by the first and second demodulating means from the detected output, Demodulate the sub-sampled data sequence recorded in the groove part, and synthesize the sub-sampled data of each system by the synthesizing means. Outputting the sample data sequence of the original n-bit length Te. As a result, it is possible to easily reproduce data with high quantization accuracy without reducing the size of the recording mark or doubling the rotation speed of the optical disc. Further, according to another optical disc reproducing apparatus, when the sub-sampled data sequence of each system recorded on the optical disc is recorded together with the recording position information, the first and second demodulating means detect the output of the recording mark detecting means. From the land portion and the sub-sample data row recorded in the groove portion are demodulated and output together with the recording position information, and the synchronizing means demodulates the recording position information from the land portion and the groove portion. Using the recording position information demodulated from, the demodulation output from the land portion and the demodulation output from the groove portion are synchronized. After that, the synthesizing means synthesizes the two systems of sub-sampled data. As a result, even if the two series of sub-sampled data strings are recorded on the optical disc at positions that are physically deviated, they can be combined at the correct positions, regardless of the deviation of the recording position between the land portion and the groove portion. Therefore, it is possible to accurately reproduce data with high quantization accuracy. Further, according to another optical disk reproducing apparatus, a sub-sample data string in which MSB, 3SB, 5SB, ... Are combined with a sampling frequency F _s , a sample data string in which one sample data has an n-bit length, 2SB, 4SB, 6
When a sequence of sub-sampled data combining SB ... Is recorded in the land portion and the groove portion of the optical disc, the synthesizing means alternately combines the bit data of the sub-sampled data of the two systems to the original n bits. Combine long sample data strings. As a result, data can be reproduced even if the sub-sampled data string is read out only for the land portion or the groove portion.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram showing the recorded contents of a phase change optical disk according to the first embodiment of the present invention. Reference numeral 1 denotes a phase change optical disk (hereinafter, abbreviated as "optical disk"), which has spiral groove portions 2A, 2A, ... And land portion 2B.
The recording marks 3 can be recorded on each of 2B, ... As separate tracks. The depth of the groove portion 2A is 1/6 of the laser wavelength of the optical pickup described later so that crosstalk with the land portion 2B is reduced.
It is set to 1/8. The track pitch of the groove portion 2A and the land portion 2B is the same as that of the CD disk, 1.6 μ.
m, and the widths of the land portion 2B and the groove portion 2A are each half the track pitch, and the C / N (carrier noise ratio of the recording mark recorded on the land portion 2B and the groove portion 2A having the same reflectance is recorded). ) Are set to be equal.

A pair of the adjacent groove portion 2A and land portion 2B is combined (here, the groove portion 2A and this groove portion 2).
A land portion 2B adjacent to the inner peripheral side of the disc with respect to A is set), the recording data DA is associated with the recording data DA in the groove portion 2A, and the recording data DA is associated with the recording data DA in the land portion 2B. Is recorded. In this embodiment, of the 4-channel surround music signals, the front 2
The ch channel digital stereo music signal is recorded in the groove portion 2A as DA, and the rear 2 channel digital stereo music signal is recorded in the land portion 2B as DB by the recording marks 3 which can be read simultaneously according to the CD format. The digital stereo music signals DA and DB recorded in the groove portion 2A and the land portion 2B are closely related to each other because they are a part of a 4-channel surround music signal in which one song is decomposed into 4 channels. Sampling frequency F _S = 44.1kHz, 1ch 1
Assuming that one sample data is represented by 16 bits, the digital stereo music signal DA has Lch sample data LA _m , LA _{m + 1} , LA _{m + 2} , ...
Sample data sequences (LA _m , RA _m ), (LA _{m + 1} , RA _m ) in which the sample data RA _m , RA _{m + 1} , RA _{m + 2} , ... ₊₁ ), (L
A _{m + 2} , RA _{m + 2} ), ..., and the digital stereo music signal DB is Lch sample data LB _m ,
LB _{m + 1} , LB _{m + 2} , ... And Rch sample data RB _m , RB _{m + 1} , RB _{m + 2} ,. LB _m , RB
_m ), (LB _{m + 1} , RB _{m + 1} ), (LB _{m + 2} , R
B _{m + 2} ), ...

In the case of the CD format, as shown in FIG. 2, sample data of Lch and Rch are alternately arranged and C
IRC coding is performed, sub-codes of 8 channels P to W are added, EFM modulation is performed, and then a frame synchronization signal is added to form one frame = 588 channel bits. Six LCH and Rch sample data sets are included in one frame. The subcode signal is such that P to W subcode data is completed in 98 frames (this is called a subcode frame, and includes 6 × 98 sample data sets of Lch and Rch). 2 frames are subcode synchronization signals S ₀ and S ₁ . For example, the Q channel information includes the track number and A-ti.
This includes me, P-time, and the like. A-tim
e, P-time are minutes, seconds, and frames (this frame is the same as the subcode frame, 1 frame = 1/75
(Seconds), and indicates the recording position on the optical disc 1 of the digital stereo music signals DA and DB.

FIG. 3 is a circuit diagram of an optical disk reproducing apparatus according to the first embodiment of the present invention, which reproduces the optical disk 1 shown in FIG. Reference numeral 10 denotes a three-beam type optical pickup for reading a recording mark on the optical disc 1. The detailed configuration is omitted, but a laser beam emitted from a semiconductor light source is divided into one main beam and two front and back sub-beams by a diffraction grating. Divide into 3 beams in total. Then, the main beam spot is moved to the groove portion 2A _i by a predetermined optical system.
A is focused, front sub beam spot is focused on the land portion 2B i _{+ 1} adjacent to the front side of the groove portion 2A _i (the outer peripheral side of the disk), the rear sub beam spot rear side of the groove portion 2A _i (disk The land portion 2B _i adjacent to the inner side) is focused. The reflected beam of the main beam spot is received by the four-division photo detector 11, and the detection signals of A, B, C, D are output. The reflected beam of the front beam spot is received by the two-divided photodetector 12, and E and F detection signals are output. The reflected beam of the back beam spot is received by the two-divided photodetector 13, and G and H detection signals are output.

Reference numeral 20 denotes an RF amplifier, which adds A, B, C and D by an adder 21 to output an RF signal RF1 for the recording mark of the groove portion 2A _i , and an adder 22.
, G and H are added to output the RF signal RF2 for the recording mark of the land portion 2B _i , or FE = (A + C) − (B + D) is calculated by a focus error circuit (not shown) to perform focusing by the astigmatism method. An error signal is output, and TE = (A + D)-(B
+ C) -K {(EF) + (GH)} (where K is the light amount ratio of the main beam and the sub beam) and outputs a tracking error signal by the push-pull method. Using a focus error signal and a tracking error signal, a servo circuit (not shown) allows the optical pickup 1
0 focus servo, tracking servo, and sled servo can be applied. The optical pickup 10 and the RF amplifier 20 constitute recording mark detection means for simultaneously detecting the recording marks 3 of the groove portion 2A _i of the optical disc 1 and the land portion 2B _i adjacent thereto.

Reference numeral 30 denotes a first digital signal processing circuit as a first demodulating means, which performs EFM data reading, frame synchronization detection, subcode signal separation, deinterleaving and error detection / error correction for the RF signal RF1. Then, the front 2ch digital stereo music signal DA recorded by the recording marks of the groove portion 2A _i is demodulated to obtain an LR clock LRCK _A (frequency = 44.1 kHz), a word clock WDCK _A (double frequency of the LR clock), It outputs serially with the bit clock BCK _A (see FIG. 4A), detects the subcode synchronization signal in parallel with this, outputs the subcode synchronization detection signal SA, and outputs the subcode data SDA of P to W. To demodulate and output. The first digital signal processing circuit 30 is also R
CL as a reproduction signal from the F signal RF1 as a speed signal
Output to the V circuit 31. The CLV circuit 31 performs frequency / phase comparison between the reference clock and the reproduction clock, forms a CLV control signal for eliminating the frequency difference and the phase difference between the reference clock and the reproduction clock, and outputs the CLV control signal to the motor driver 32. The spindle motor 33 is driven.

Reference numeral 40 denotes a second digital signal processing circuit as a second demodulation means, which performs EFM data reading from the RF signal RF2, frame synchronization detection, subcode signal separation, deinterleaving and error detection / error correction. Rear 2 recorded by the recording mark of the land portion 2B _i
LR by demodulating ch digital stereo music signal DB
It is serially output together with the clock LRCK _B (frequency = 44.1 kHz), the word clock WDCK _B (double the frequency of the LR clock), and the bit clock BCK _B (FIG. 4).
(See (2)), and in parallel with this, the subcode synchronization signal is detected and the subcode synchronization detection signal SB is output, and the subcode data SDB of P to W are demodulated and output.

Reference numeral 50 denotes a synchronizing circuit, which is a groove portion 2A _i.
If the recording positions of the digital stereo music signals DA and DB recorded in the land portion 2B _i are displaced in the track direction, the displacement is canceled. A concrete configuration of the synchronizing circuit 50 is shown in FIG. Of these, 51 is a first ring buffer for temporarily storing the digital stereo music signal DA, which is composed of a dual port RAM. This first
As shown in FIG. 7, the ring buffer 51 stores data (32 bits) in which L and R are 1 sample each, and I = 6 × 98 ×
It has a capacity capable of storing n pieces (that is, n sub-code frames). The data storage area of the first ring buffer 51 is distinguished by addresses 0 to (I-1). 5
2 cyclically updates the write pointer WA for the first ring buffer 51 in the range of 0 to (I-1),
A first write control circuit for serially writing the digital stereo music signal DA output from the first digital signal processing circuit 30 into a data storage area indicated by the write pointer WA, with each pair of sample data L and R as a set. . The first write control circuit 52 outputs the LR clock LRCK output from the first digital signal processing circuit 30.
_A , word clock WDCK _A , bit clock BCK
_{Use A} to write. Specifically, after the write pointer WA is incremented at the timing when both the LR clock LRCK _A and the word clock WDCK _A fall, the 16-bit length sample data of Lch is stored in the data storage area indicated by WA according to the bit clock BCK _A. Serially store in upper 16 bits, then LR
Clock LRCK _A rises and word clock WD
Bit clock B from the timing when CK _A falls
According to CK _A , 16-bit length sample data of Rch is serially stored in the lower 16 bits of the data storage area indicated by WA (see FIG. 7).

53 cyclically updates the read pointer RA for the first ring buffer 51 within the range of 0 to (I-1), and L from the data storage area indicated by the read pointer RA in the first ring buffer 51. It is a first read-out control circuit for serially reading out sample data sets of R and R and outputting as a digital stereo music signal DA '. The first read control circuit 53 performs a read operation using an LR clock LRCK, a word clock WDCK, and a bit clock BCK input from a synchronization control circuit described later. Specifically, after the read pointer RA is incremented at the timing when both the LR clock LRCK and the word clock WDCK fall, sample data of 16-bit length of Lch is stored in the upper 16 bits of the data storage area indicated by RA according to the bit clock BCK. From the timing of the rise of the LR clock LRCK and the fall of the word clock WDCK according to the bit clock BCK.
Bit-length sample data is serially read from the lower 16 bits of the data storage area indicated by RA (see FIG. 6).
Reference numeral 54 is a first management memory for managing information indicating the recording position on the optical disc 1 of the digital stereo music signal DA stored in the first ring buffer 51.
As shown in FIG. 5, only n sets of write address and A-time pair data can be stored.

Reference numeral 55 is a second ring buffer for temporarily storing the digital stereo music signal DB, which is composed of a dual port RAM. This second ring buffer 5
As shown in FIG. 9, 5 is the data of 32 bits, J = 6 ×
It has a capacity of storing 98 × n (that is, n sub-code frames). The data storage area of the second ring buffer 55 is distinguished by addresses 0 to (J-1). 56 cyclically updates the write pointer WB for the second ring buffer 55 in the range of 0 to (J-1), while changing the digital stereo music signal DB output from the second digital signal processing circuit 40 to L and R. Is a second write control circuit that serially writes one sample data into a data storage area indicated by the write pointer WB. The second write control circuit 56 outputs the LR clock L output from the second digital signal processing circuit 40.
A write operation is performed using RCK _B , word clock WDCK _B (double the frequency of LR clock), and bit clock BCK _B. Specifically, LR clock LRCK _B
After the write pointer WB is incremented at the timing when both the word clock WDCK _B and the word clock WDCK _B fall, the 16-bit length sample data of Lch is stored in the upper 1 of the data storage area indicated by WB according to the bit clock BCK _B.
Serially stored in 6 bits, then LR clock L
From the timing when RCK _B rises and the word clock WDCK _B falls, the sample data of 16-bit length of Rch is serially stored in the lower 16 bits of the data storage area indicated by WB according to the bit clock BCK _B (see FIG. 9).

Reference numeral 57 denotes L from the data storage area indicated by the read pointer RB in the second ring buffer 55 while cyclically updating the read pointer RA for the second ring buffer 55 within the range of 0 to (J-1). It is a second read control circuit that serially reads the sample data sets of R and R and outputs them as a digital stereo music signal DB '. The second read control circuit 57 performs a read operation using an LR clock LRCK, a word clock WDCK, and a bit clock BCK input from a synchronization control circuit described later. Specifically, after the read pointer RB is incremented at the timing when both the LR clock LRCK and the word clock WDCK fall, the 16-bit sample data of Lch is stored in the upper 16 bits of the data storage area indicated by RB according to the bit clock BCK. From the lower 16 bits of the data storage area indicated by RB according to the bit clock BCK from the timing when the LR clock LRCK rises and the word clock WDCK falls. (See FIG. 6). 5
Reference numeral 8 denotes a second management memory for managing information indicating the recording position on the optical disc 1 of the digital stereo music signal DB stored in the second ring buffer 55, and FIG.
As shown in FIG. 5, only n sets of write address and A-time pair data can be stored.

Reference numeral 59 denotes a digital stereo music signal DA read from the first ring buffer 51 by the first read control circuit 53, and digital stereo music signal read from the second ring buffer 55 by the second read control circuit 57. This is a synchronization control circuit for synchronizing so that the recording position information indicating the recording position of the DB on the optical disc 1 becomes the same. This synchronization control circuit 59 is L
An R clock LRCK (frequency = 44.1 kHz), a word clock WDCK (double the frequency of the LR clock LRCK), and a bit clock BCK are generated and output to the first read control circuit 53 and the second read control circuit 57 (FIG. 6). reference). Also, each time the first sub-code synchronization detection signal SA is output from the first digital signal processing circuit 30, the write pointer WA in the first write control circuit 52 at that time and the Q channel output from the first digital signal processing circuit 30. A-time (A) in the data is paired and stored in the first management memory 53 (see FIG. 8). Further, each time the second digital signal processing circuit 40 outputs the subcode synchronization detection signal SB, the write pointer WB and the second write pointer WB in the second write control circuit 56 at that time are
The A-time (B) in the Q channel data output from the digital signal processing circuit 40 is paired and stored in the second management memory 58 (see FIG. 10).

Then, the first digital signal processing circuit 30
The write pointer and A-time are written in the first management memory 53 based on the input of the subcode synchronization detection signal SA from
When (A) is written, the A-time (A) written in the first management memory 53 this time and the second management memory 58 are written.
The previously written A-time (B) is compared, and if A-time (A)> A-time (B), the digital stereo music signal DA is the DB.
Since it can be seen that the recording position is shifted earlier, the read pointers RA and RB are not set, but conversely, if A-time (A) ≤A-time (B), then the digital stereo music signal DA Is DB
Since it can be seen that the recording position is shifted later, the first read control circuit 54 writes the first management memory 53 this time at the timing when the LR clock LRCK first rises after the subcode synchronization detection signal SA is input. Set the write pointer as the read pointer,
In the second read control circuit 57, of the second management memory 58, the A-tim that has been written in the first management memory 53 this time.
The write pointer stored as a pair with A-time (B) having the same value as e (A) is set as the read pointer.

When the write pointer and A-time (B) are written in the second management memory 58 based on the input of the subcode synchronization detection signal from the second digital signal processing circuit 40, this time, the second management memory A-time (B) written in 58 and A-time (A) previously written in the first management memory 53 are compared, and if A-time (B)> A-time (A), then digital stereo Music signal DB is DA
Since it can be seen that the recording position is shifted earlier, the read pointer is not set, but conversely, if A-time (B) ≤ A-time (A), then the digital stereo music signal DB is better. DA
Since it can be seen that the recording position is displaced later, the second read control circuit 57 writes in the second management memory 58 this time at the timing when the LR clock LRCK rises after the subcode synchronization detection signal SB is input. The write pointer is set as the read pointer, and the first read control circuit 53 sets the A-tim written in the second management memory 58 in the first management memory 54 this time.
The write pointer stored as a pair with A-time (A) having the same value as e (B) is set as the read pointer.

The sync control circuit 59 receives the subcode sync detection signal SA (SB) and then writes a pointer to the first (2) management memory 54 (58) and A-tim.
e (A) (A-time (B)) writing, A-ti
Discrimination between me (A) and A-time (B), first
(2) The preparation for setting the read pointer to the read control circuit 53 (57) is processed at a speed higher than the cycle of the bit clock BCK.

In this way, the synchronization control circuit 59 controls the optical disc 1 among the digital stereo music signals DA and DB.
The preceding recording position is delayed by a certain amount so that the digital stereo music signals DA and DB at the same recording position are output at the same time.

Reference numeral 60 is a first D / A converter for converting the digital stereo music signal DA output from the first read control circuit 53 into DA for each channel, and 61 is a digital stereo music signal DB output from the second read control circuit 57. Second D / A converter for DA converting each channel, 62 and 63 are front Lch and Rch amplifiers, 6
Reference numerals 4 and 65 are rear Lch and Rch amplifiers, 66 and 67 are front Lch and Rch speakers, and 68 and 69 are rear Lch and Rch speakers.

Next, the operation of the above embodiment will be described. FIG. 11 is a time chart showing the operation of the optical disc reproducing apparatus of FIG. The digital stereo music signal DA recorded on the groove portion 2A of the optical disk 1 is more digitally recorded on the land portion 2B _i.
It is assumed that the recording position precedes B in the track direction by about 2 subcode frames. The recording mark 3 of the groove portion 2A _i and the land portion 2B _i of the optical disc 1 is recorded by the optical pickup 10 and the RF amplifier 20 as the RF signal RF.
1, detected as RF signal RF2. RF signal RF1
Based on the above, the first digital signal processing circuit 30 performs binarization, clock reproduction and synchronization detection, EFM demodulation, de-interleaving, error correction, etc. to perform digital stereo music signal D.
A is demodulated and output, the subcode synchronization signals (S ₀ , S ₁ ) are detected from the subcode signal, the subcode synchronization detection signal SA is output, and the subcode data SDA of P to W are demodulated. Output. Based on the RF signal RF2, the second digital signal processing circuit 40 performs binarization, clock reproduction and synchronization detection, EFM demodulation, de-interleaving, error correction, etc. to demodulate and output the digital stereo music signal DB. The subcode synchronization signals (S ₀ , S ₁ ) are detected from the code signal, the subcode synchronization detection signal SB is output, and the P to W subcode data SD is detected.
B is demodulated and output. Subcode synchronization detection signal SA,
SB is output once per subcode frame, and subcode data SDA and SDB are updated once per subcode frame.

The digital stereo music signal DA output from the first digital signal processing circuit 30 is synchronized with the synchronization circuit 50.
Are sequentially written in the first ring buffer 51 by the first write control circuit 52 (see FIG. 7). And
Each time the subcode synchronization detection signal SA is input, the synchronization control circuit 59 stores the write pointer WA at that point in time and the A-time in the subcode data SDA as a pair in the first management memory 54 (FIG. 8, FIG. (See FIG. 11). Similarly,
The digital stereo music signal DB output from the second digital signal processing circuit 40 is sequentially written in the second ring buffer 51 by the second write control circuit 56 of the synchronizing circuit 50 (see FIG. 9). Then, each time the subcode synchronization detection signal SB is input, the synchronization control circuit 59 causes the write pointer WA and the subcode data S at that point in time.
The A-time in the DB is paired and stored in the second management memory 58 (see FIGS. 10 and 11). The contents of the first ring buffer 51 and the first management memory 54, and the contents of the second ring buffer 55 and the second management memory 58 are shown in FIGS.
It becomes like FIG.

The synchronization control circuit 59 receives the subcode synchronization detection signal SA or SB from the first management memory 54.
Alternatively, when the management data is stored in the second management memory 58, the A-time (A) or A-ti stored this time is stored.
me (B) and the previously stored A-time (B) or A
-Compare the size of time (A). tA ₁ , tA ₂ ,
When the subcode synchronization detection signal SA is input at the timing of tA ₃ , ..., Since A-time (A)> A-time (B), the synchronization control circuit 59 causes the first read control circuit 5 to operate.
3. The read pointer for the second read control circuit 57 is not set. On the other hand, tB ₁ , tB ₂ , tB ₃ ,
When the subcode synchronization detection signal SB is input at the timing of ..., A-time (B) <A-time (A) is satisfied, so the synchronization control circuit 59 causes the first read control circuit 5 to operate.
3. Set the read pointer for the second read control circuit 57.

For example, when SB is input at the timing of tB ₃ , since A-time (B) = 23 minutes 48 seconds 14 frames and A-time (A) = 23 minutes 48 seconds 15 frames, a digital stereo music signal is obtained. DB is DA
It is determined that the recording position on the optical disk 1 is delayed further, and then, at the timing when the LR clock LRCK rises, the second read control circuit 57 receives the second subcode synchronization detection signal SB of tB ₃ when the second code is detected. Management memory 58
The write pointer = 1177 stored in the second management memory 58 is set as the read pointer RB, and A-time (B) stored in the second management memory 58 when the sub-code synchronization detection signal SB of tB ₃ is input to the first read control circuit 53. = 2
3 minutes 48 seconds 14th frame and the same A-time as the first pair
The write pointer = 2 stored in the management memory 54 is set as the read pointer RA (see FIG. 11).

According to the word clock WDCK and the bit clock BCK, the first read control circuit 53 serially reads the sample data of Lch and Rch from the address of RA = 2 set this time in the first ring buffer 51 (see FIG. 6). After that, while RA is incremented every time both the LR clock LRCK and the word clock WDCK fall, according to the word clock WDCK and the bit clock BCK, the addresses RA to Lch and R
Ch sample data is read serially. Similarly,
The second read control circuit 57 uses the word clock WDCK,
According to the bit clock BCK, the second ring buffer 55
Among these, the sample data of Lch and Rch are serially read from the address of RB = 1177 set this time (see FIG. 6), and thereafter, RB is incremented each time both the LR clock LRCK and the word clock WDCK fall, In accordance with the word clock WDCK and the bit clock BCK, Lch and Rch sample data are serially read from the address RB. As a result, the first
The digital stereo music signal DA ′ output from the read control circuit 53 and the digital stereo music signal DB ′ output from the second read control circuit 57 are synchronized with each other, and there is a shift in A-time, that is, on the optical disc 1. The signal becomes a signal in which the deviation of the recording position is eliminated (see FIG. 11). The same is true when the subcode synchronization detection signal SB is input at each timing of tB ₁ , tB ₂ , tB ₄ , ...

The digital stereo music signal DA 'is the first
The D / A converter 60 performs D / A conversion for each channel.
The Lch is amplified by the amplifier 62 and then acoustically output by the front Lch speaker 66, and the Rch is amplified by the amplifier 63 and then acoustically output by the front Rch speaker 67. The digital stereo music signal DB 'is the second
The D / A converter 61 performs D / A conversion for each channel.
The Lch is amplified by the amplifier 64 and then acoustically output by the rear Lch speaker 68, and the Rch is amplified by the amplifier 65 and then acoustically output by the rear Rch speaker 69.

According to this embodiment, the front 2ch digital stereo music signal DA (sampling frequency = 44.1kHz) is recorded in the groove portion 2A of the optical disk 1, and the rear 2ch digital stereo music signal DB is also recorded in the land portion 2B. (Sampling frequency = 44.1 kHz) is recorded, the recording marks of the groove portion 2A and the land portion 2B are simultaneously read by one optical pickup 10, and the RF amplifier 20 creates two systems of RF signals, and first and second Since the digital signal processing circuits 30 and 40 are configured to demodulate and output at the same time, it is possible to reproduce high-quality surround music of 4 channels. Also, the digital stereo music signal DA of the groove portion 2A and the land portion 2B of the optical disc 1
The recording position information (here, A-time of the subcode Q channel) is also recorded in the digital stereo music signal DB, and the same recording is performed by the synchronizing circuit 50 using the recording position information for synchronization. Since the position digital stereo music signal DA and the digital stereo music signal DB are output at the same time, between the digital stereo music signal DA of the groove portion 2A and the digital stereo music signal DB of the land portion 2B on the optical disc 1. ,
Even if there is a recording position deviation in the track direction due to recording on the front side and the rear side at different times during recording, there will be an unnatural time difference between the reproduced sound on the front side and the rear side. Does not happen. First and second ring buffers 51 and 5
If the data for n sub-code frames can be stored in 5, it is possible to cope with the shift of (n-1) sub-code frames at the maximum.

The subcode Q channel P-ti
Since me also indicates the recording position on the optical disc 1,
Even if P-time is used instead of A-time, the synchronizing circuit 50 uses two systems of digital stereo music signals DA and D.
B can be synchronized. Further, as a modified example of the optical disc reproducing apparatus shown in FIG. 3, a normal optical disc in which the digital stereo music signal DA is recorded only in the groove portion 2A, and a digital stereo music signal DA in the groove portion 2A are recorded. When it is desired to reproduce both of the high density optical discs in which the digital stereo music signal DB is recorded in the section 2B as well, as shown in FIG. 12, the first digital signal processing circuit 30 is connected to the input side of the first D / A converter 60. A changeover switch 70 for changing over the output digital stereo music signal DA and DA ′ output from the synchronizing circuit 50 is added. Then, as the TOC information, the identification information of the normal disc and the high-density disc is recorded on the optical disc 1, and when the disc is set, a system controller (not shown) reads the identification information to determine the disc type. In the case of a high density disc, the added changeover switch 70 is changed over to the side of the synchronizing circuit 50, and each part of the optical disc reproducing device is operated as it is. For regular disks, the second
Digital signal processing circuit 40, synchronization circuit 50, second D /
The operation of the A converter 61 is stopped, the added changeover switch 70 is switched to the side of the first digital signal processing circuit 30, and the digital stereo music signal DA output from the first digital signal processing circuit 30 is synchronized with the synchronizing circuit 50. May be bypassed and input to the first D / A converter 60.

Even if the optical disc 1 has digital stereo music signals DA and DB recorded in both the groove portion 2A and the land portion 2B, a phase change optical disc can be reproduced only by the digital stereo music signal DA in the groove portion 2A. It can be played on a normal CD player. Also,
The first and second write control circuits 52 in the synchronization circuit 50,
56 may write the digital stereo music signals DA and DB into the first and second ring buffers 51 and 55 while serial-parallel converting one sample data (or two sample data sets of L and R), The first and second read control circuits 53 and 57 also receive 1 sample data (or 2 of L and R) from the first and second ring buffers 51 and 55.
The sample data sets may be read in parallel, and parallel-serial conversion may be performed for output.

In place of the 4-channel surround music signal, the groove portion 2A of the optical disc 1 is provided with a digital stereo music signal DA having only accompaniment, and the land portion 2B is provided with a digital stereo music signal DB having only vocals.
Even if the sub-code data including A-time is recorded according to the CD format, stereo reproduction can be performed separately for accompaniment and vocal by the optical disc reproducing device of FIG. 3, and the first D / A conversion is performed on the output side of the optical disc reproducing device. The volume and balance can be adjusted independently for the accompaniment and vocals by passing through the 2ch preamplifier separately for the device 60 and the second D / A converter 61. Even when the vocal digital stereo music signal DB recorded on the land portion 2B of the optical disc 1 can be rewritten from the software manufacturer's vocal to the user's voice, the subcode data including A-time can be rewritten together. For example, groove part 2
Even if the recording position deviates from the accompaniment of A,
By the function of the synchronizing circuit 50, synchronized reproduction can be performed. Further, as shown in FIG. 13, a mixing circuit 71 for synthesizing the Lch outputs of the first D / A converter 60 and the second D / A converter 61 and the first D / A converter 60 and the first D / A converter 61 are provided on the output side of the optical disk reproducing apparatus.
By providing the mixing circuit 72 for synthesizing the Rch outputs of the D / A converter 60 and the second D / A converter 61, the amplifiers 62 and 63 and the speaker 66 for two channels are provided as output means.
Even an audio system having only 67 can realize three performance states of accompaniment only, accompaniment + vocal, and only vocal, which is suitable for karaoke practice and the like. The mixing of the two channels of Lch and the mixing of the two channels of Rch may be performed in the digital domain before D / A conversion.

FIG. 14 is an explanatory diagram of data recorded on a phase change optical disk (hereinafter, abbreviated as optical disk 1A) according to the second embodiment of the present invention. In the second embodiment, L of the sampling frequency 88.2kHz, sample data string _{R2ch (LC n, RC n)} , (LC n + 1, RC n + 1), (LC
_{n + 2} , RC _{n + 2} ), (LC _{n + 3} , RC _{n + 3} ), (LC
_A digital stereo music signal DC consisting of _{n + 4} , RC _{n + 4} ), (LC _{n + 5} , RC _{n + 5} ), ... Is used as a source. Then, set the sampling frequency to 4
Sample data strings of two systems L and R2ch at 4.1 kHz (LA _m = LC _n , RA _m = RC _n ), (LA _{m + 1} = L
C _{n + 2} , RA _{m + 1} = RC _{n + 2} ), (LA _{m + 2} = L
C _{n + 4} , RA _{m + 2} = RC _{n + 4} ), ..., (LB _m =
LC _{n + 1} , RB _m = RC _{n + 1} ), (LB _{m + 1} = L
C _{n + 3} , RB _{m + 1} = RC _{n + 3} ), (LB _{m + 2} = L
C _{n + 5} , RB _{m + 2} = RC _{n + 5} ), ... Each of the land portions 2B adjacent to the inner peripheral side is recorded with a record mark 3 capable of being simultaneously read in a form including subcode data in accordance with the CD format. Recorded data DA and DB are each independently sampling frequency 4
4.1kHz digital stereo music signal DA and DB are constructed (however, DA and DB are the same song).

FIG. 15 is a circuit diagram of the optical disk reproducing apparatus according to the second embodiment of the present invention with a part thereof omitted, and reproduces the optical disk 1A. The same components as those in FIG. 3 are designated by the same reference numerals. In the optical disc reproducing apparatus of FIG. 15, the configuration different from that of FIG.
The synchronous circuit 50A has almost the same configuration as the synchronous circuit 50, but the synchronous control circuit 59A outputs the LR clock LRCK, the word clock WDCK, and the bit clock BCK to the first and second read control circuits 53 and 57, as well as these. LR clocks LRCK ', word clocks WDCK', which are synchronized and delayed by 1/2 cycle of the bit clocks BCK,
The bit clock BCK 'is also output (see FIG. 16).

A synthesizing circuit 80 is provided on the output side of the synchronizing circuit 50A.
Is provided, and a digital stereo music signal DA 'is provided.
And DB 'are combined to restore one system of digital stereo music signal DC with a sampling frequency of 88.2 kHz. Reference numerals 81 and 82 respectively denote first and second shift registers of 16-bit length, which are digital stereo music signals DA '.
Among them, Lch sample data and Rch sample data are stored. LR clock LRCK 'and word clock W
After DCK 'falls, next LR clock LRC
The first shift register 81 can be shifted until K ′ rises and the word clock WDCK ′ falls, and Lch sample data is sequentially transferred from MSB to LSB according to the bit clock BCK ′. Also, LR
Clock LRCK 'rises and word clock WDC
After K'falls, next LR clock LRCK '
Until the word clock WDCK 'falls, the second shift register 82 can shift, and the Rch sample data is sequentially transferred from MSB to LSB according to the bit clock BCK'. Reference numerals 83 and 84 respectively denote 16-bit third and fourth shift registers, which store Lch sample data and Rch sample data in the digital stereo music signal DB '. LR clock LRC
After K'and the word clock WDCK 'have fallen,
Next, until the LR clock LRCK ′ rises and the word clock WDCK ′ falls, the third shift register 8
3 becomes ready for shift operation, and Lch sample data is sequentially transferred from MSB to LSB according to the bit clock BCK '. Also, after the LR clock LRCK 'rises and the word clock WDCK' falls, next, the LR clock LRCK 'and the word clock WD
The fourth shift register 84 can be shifted until CK ′ falls, and the fourth shift register 84 shifts according to the bit clock BCK ′.
Ch sample data is sequentially transferred from MSB to LSB.

Reference numeral 85 is a shift register for synthesis with a parallel latch function of 16 × 4 bit length, which has an LR clock L
The first shift register 8 at the falling timing of RCK
Bit data of each stage of the first to fourth shift registers 84 is latched in parallel, and then sequentially transferred in accordance with a high-speed bit clock HBCK having a frequency twice as high as the bit clock BCK ′ input from a timing circuit (not shown), and M
Serially output bit by bit from the SB side. The output of the synthesis shift register 85 has a sampling frequency of 88.2kH.
It is a Z, L, R 2ch digital stereo music signal DC (see FIG. 16). 86 is a D / A for D / A converting the digital stereo music signal DC for each channel and outputting it.
Converter, 87 and 87 are amplifiers that amplify each channel,
Reference numerals 88 and 89 are speakers that reproduce sound by channel. The other components are constructed in exactly the same way as in FIG.

Next, the operation of the optical disk reproducing apparatus shown in FIG. 15 will be described with reference to the time chart shown in FIG. Each recorded on the groove portion 2A and the land portion 2B of the optical disc 1A by the simultaneously readable recording marks 3,
The digital stereo music signals DA and DB having a sampling frequency of 44.1 kHz are demodulated and output by the optical pickup 10, the RF amplifier 20, the first digital signal processing circuit 30 and the second digital signal processing circuit 40 as in the case of FIG. Further, when there is a deviation in the recording position between the digital stereo music signals DA and DB on the optical disc 1A, the synchronizing circuit 50A synchronizes them and the digital stereo music signals DA 'and DB' are combined as a synthesizing circuit 80.
Is output to

In the synthesizing circuit 80, the 16-bit long Lch sample data and Rch sample data of the digital stereo music signal DA 'are separately transferred to the first shift register 81 and the second shift register 82, and in parallel therewith. , Digital stereo music signal DB ', 16
The bit-length Lch sample data and Rch sample data are also included in the third shift register 83 and the fourth shift register 84.
It is transferred separately. Then, when the transfer of the L and R sample data sets is completed and the LR clock LRCK ′ falls, each of the first to fourth shift registers 81 to 84.
The bit data of each stage is parallel latched in the corresponding stage of the combining shift register 85. As a result, for example,
LA _m = LC as digital stereo music signal DA '
_n , RA _m = LC _n are output, and LB _m = LC _{n + 1} , RB _m = LC as the digital stereo music signal DB ′.
_{When n + 1} is output, LC _n , RC _n , LC _{n + 1} , and RC _{n + 1} are stored in the combining shift register 85.

The data in the combining shift register 85 is shifted at high speed in accordance with the double speed bit clock HBCK, and LC
Serial output is made in the order of _n , RC _n , LC _{n + 1} , and RC _{n + 1} . Therefore, the synthesis shift register 85 outputs the digital stereo music signal D having a sampling frequency of 88.2 kHz.
C will be output. This digital stereo music signal DC is D / A converted by the D / A converter 86 for each channel.
After being converted, the signals are amplified by the amplifiers 87 and 88 for each channel, and further, the sound is output from the speakers 89 and 90 for each channel.

According to this embodiment, the sample data sequence forming the digital stereo music signal DC having the sampling frequency of 88.2 kHz is divided into two groups of sample data sequences every other channel in advance, and the groove part 2A and the land part 2B are divided. The recording marks are recorded so that they can be read simultaneously (each system is a digital stereo music signal DA and DB with a sampling frequency of 44.1 kHz). Then, the groove portion 2A and the land portion 2 of the optical disc 1A are used by the optical disc reproducing device.
Since the data recorded by the recording mark 3 on B is read at the same time, and the sample data of the two systems are alternately synthesized and outputted by the synthesizing circuit 80, the recording mark on the optical disc can be made small and the rotation speed of the optical disc can be reduced. It is possible to read data from an optical disc at a high transmission rate without speeding up, and it is possible to reproduce sound with extremely high sound quality. In this respect, when data is recorded only on one of the groove portion and the land portion, it is necessary to reduce the recording mark or increase the rotation speed of the optical disc in order to reproduce the data having a high sampling frequency. However, it is not possible to reduce the recording mark due to the restrictions on the manufacturing accuracy of the optical disk and the detection capability of the optical pickup, and in order to increase the rotation speed of the optical disk, the spindle motor must be large and the motor driver must be driven. The ability must be increased, and the burden on the configuration is large. Recording position information (here, A-time of subcode Q channel) is also recorded in the digital stereo music signal DA and the digital stereo music signal DB of the groove portion 2A and the land portion 2B of the optical disc 1A, Since the synchronizing circuit 50A synchronizes with the recording position information so that the digital stereo music signal DA and the digital stereo music signal DB at the same recording position are simultaneously output, the groove portion 2A of the groove portion 2A on the optical disc 1A is output. Even if a recording position shift exists between the digital stereo music signal DA and the digital stereo music signal DB of the land portion 2B, no sound distortion occurs.

The subcode Q channel P-ti
Since me also indicates the recording position on the optical disc 1A, the synchronization circuit 50A uses P-ti instead of A-time.
Even if me is used, two systems of digital stereo music signal D
A and DB can be synchronized. Further, as a modified example of the optical disc reproducing apparatus shown in FIG. 15, a normal optical disc in which a digital stereo music signal DA having a sampling frequency of 44.1 kHz is recorded only in the groove portion 2A and a digital stereo music signal having a sampling frequency of 88.2 kHz. When it is desired to reproduce both the high density optical disc 1A recorded in the groove portion 2A and the land portion 2B by distributing every other DC sample data sequence to two systems, as shown in FIG. Processing circuit 3
The digital stereo music signal DA output from 0 is D
A D / A converter 91 for A / A conversion is provided, and the DA / converter 8
A changeover switch 92 for switching between the output of 6 and the output of the D / A converter 91 is added. And the optical disc 1
As TOC information, identification information of a normal disc and a high-density optical disc 1A is recorded in A, and a system controller (not shown) reads the identification information when the disc is set to determine the type of disc. In the case of the optical disc 1A, add the changeover switch 92
By switching to the / A converter 86 side, each unit of the optical disk reproducing apparatus is operated as it is. For regular disks,
The operations of the second digital signal processing circuit 40, the synchronizing circuit 50A, the synthesizing circuit 80, and the D / A converter 86 are stopped, and the changeover switch 92 is switched to the D / A converter 91 side to make the first digital signal processing circuit. D / A converter 91 converts the digital stereo music signal DA output from 30
It suffices to output the A / A converted audio signal.

As shown in FIG. 14, the groove portion 2A
And digital land music signal D to both the land section 2B
Even the optical disc 1A on which A and DB are recorded can be reproduced by a normal CD player capable of reproducing a phase change optical disc if only the digital stereo music signal DA of the groove portion 2A.

FIG. 18 is an explanatory diagram of data recorded on a phase change optical disk (hereinafter, abbreviated as optical disk 1B) according to the third embodiment of the present invention. In the third embodiment, the sampling frequency is 44.1 kHz, but L, R2c of 32 bit length is used.
h sample data string of _{(LD n, RD n),} (L
D _{n + 1} , RD _{n + 1} ), (LD _{n + 2} , RD _{n + 2} ), (LD
_A digital stereo music signal DD consisting of _{n + 3} , RD _{n + 3} ), (LD _{n + 4} , RD _{n + 4} ), ... Is used as a source. Each sample data LD _i , RD _i is distributed every other one from the largest bit position, and Lch is divided into two sub-sample data LD _i (1) and LD _i (2), R
ch is two sub-sampled data RD _i (1) and RD _i
Divide into (2). As shown in FIG. 19, sub-sampled data LD _i (1) includes MSB, 3SB, 5S of LD _i.
A total of 16 bit data of B, 7SB, ... 31SB are combined as MSB to LSB, and LD _i
(2) is 2SB, 4SB, 6SB, 8S of LD _i
B, ... LSB 16 bits in total, MSB to
It is combined as an LSB. Further, the sub-sampled data RD _i (1) is the MSB, 3S of RD _i.
A total of 16 bit data of B, 5SB, 7SB, ... 31SB are combined as MSB to LSB, and RD _i (2) is 2SB, 4SB, 6S of LD _i.
A total of 16 bit data of B, 8SB, ... LSB are combined as MSB to LSB.

Then, a 16-bit long L, R2ch sub-sampled data string (LA _m = LD _n (1), RA _m =
RD _n (1)), (LA _{m + 1} = LD _{n + 1} (1), RA
_{m + 1} = RD _{n + 1} (1)), (LA _{m + 2} = LD
_{n + 2} (1), RA _{m + 2} = RD _{n + 2} (1)), ... As recording data DA in the groove portion 2A _i , and a 16-bit long L, R2ch sub-sampled data string ( LB _m
= LD _n (2), RB _m = RD _n (2)), (LB _{m + 1}
= LD _{n + 1} (2), RB _{m + 1} = RD _{n + 1} (2)), (L
B _{m + 2} = LD _{n + 2} (2), RB _{m + 2} = RD
_{n + 2} (2)), etc. are used as recording data DB for simultaneous recording in the land portion 2B adjacent to the groove inner portion 2A to the groove portion 2A in accordance with the CD format including subcode data. It is recorded with mark 3. Assuming that the 32-bit sample data of the digital stereo music signal DD is represented by 2's complement, the recording data DA and DB are each independently recorded as the digital stereo music signal DA. , DB.

FIG. 20 is a circuit diagram of the optical disk reproducing apparatus according to the third embodiment of the present invention with a part thereof omitted, and reproduces the optical disk 1B. The same components as those in FIG. 3 are designated by the same reference numerals. In the optical disc reproducing apparatus of FIG. 20, the configuration different from that of FIG.
The synchronous circuit 50B has almost the same configuration as the synchronous circuit 50, but the synchronous control circuit 59B outputs the LR clock LRCK, the word clock WDCK, and the bit clock BCK to the first and second read control circuits 53 and 57, as well as these. LR clock LRCK 'synchronized with and delayed by 1/2 cycle of bit clock BCK, word clock WDCK',
The bit clock BCK 'is also output (see FIG. 21).

A synthesizing circuit 93 is provided on the output side of the synchronizing circuit 50B.
Is provided, and a digital stereo music signal DA 'is provided.
And DB 'are combined, and a sampling frequency of 44.1 kHz and a 32-bit length digital stereo music signal D
D is restored. Reference numerals 94 and 95 respectively denote 16-bit first and second shift registers, which store Lch sample data and Rch sample data in the digital stereo music signal DA '. After the LR clock LRCK 'and the word clock WDCK' fall, the LR clock LRCK 'next rises and the word clock WDCK
The first shift register 94 is allowed to perform the shift operation until ‘′ falls, and Lch is set according to the bit clock BCK ′.
Of the sample data are sequentially transferred from MSB to LSB. Also, the second shift register 95 can perform the shift operation after the rise of the LR clock LRCK ′ and the fall of the word clock WDCK ′ until the next fall of the LR clock LRCK ′ and the word clock WDCK ′, and according to the bit clock BCK ′. Rch sample data is sequentially transferred from MSB to LSB. 96 and 97
Are 16-bit length third and fourth shift registers, respectively, which store Lch sample data and Rch sample data in the digital stereo music signal DB ′. LR
After the clock LRCK 'and the word clock WDCK' fall, the third shift register 96 can shift until the LR clock LRCK 'rises and the word clock WDCK' falls, and the Lch sample is sampled according to the bit clock BCK '. Data is sequentially transferred from MSB to LSB. In addition, after the LR clock LRCK ′ rises and the word clock WDCK ′ falls, the fourth shift register 97 can perform the shift operation until the next LR clock LRCK ′ and word clock WDCK ′ fall, and the bit clock BC
Rch sample data from MSB to LSB according to K '
Up to.

Reference numeral 98 denotes a synthesizing shift register with a parallel latch function of 32 × 2 bit length, which has an LR clock L
Every other bit data of each stage of the first and second shift registers 94 and 95 is latched in parallel at the falling timing of RCK ', and the gap is filled, and the third and third bits are set.
Every other bit data of each stage of the fourth shift registers 96 and 97 is latched in parallel, and then the bit clock BCK ′ input from a timing circuit (not shown).
It is sequentially transferred according to the high-speed bit clock HBCK having a frequency twice as high as the above, and serially output bit by bit from the last stage. The output of the synthesizing shift register 98 is a digital stereo music signal DD of L and R2 channels having a sampling frequency of 44.1 kHz and one sample data of 32 bits (see FIG. 21). Reference numeral 100 is a D / A converter for D / A converting the digital stereo music signal DC for each channel and outputting the same, 101 and 102 are amplifiers for amplifying each channel, and 103 and 104 are speakers for reproducing sound by each channel. The other components are constructed in exactly the same way as in FIG.

Next, the operation of the optical disk reproducing apparatus shown in FIG. 20 will be described with reference to the time chart shown in FIG. Each recorded on the groove portion 2A and the land portion 2B of the optical disc 1B by the readable recording marks 3,
The digital stereo music signals DA and DB having a sampling frequency of 44.1 kHz are demodulated and output by the optical pickup 10, the RF amplifier 20, the first digital signal processing circuit 30 and the second digital signal processing circuit 40 as in the case of FIG. Further, if there is a deviation in the recording position between the digital stereo music signals DA and DB on the optical disc 1B, the synchronization circuit 50B synchronizes them and the digital stereo music signals DA 'and DB' are combined as a synthesis circuit 93.
Is output to

In the synthesizing circuit 93, 16-bit long Lch subsample data and Rch subsample data of the digital stereo music signal DA 'are separately transferred to the first shift register 94 and the second shift register 95,
In parallel with this, each of the digital stereo music signals DB ′, 16-bit long Lch subsample data and Rc
h sub-sampled data is also stored in the third shift register 96 and the fourth
It is transferred separately to the shift register 97. And L,
When the transfer of the R subsample data set is completed and the LR clock LRCK ′ falls, the bit data of each stage of the first to fourth shift registers 94 to 97 is parallel to the corresponding stage of the combining shift register 98. Latched. As a result, for example, the digital stereo music signal D
As A ', LA _m = LD _n (1), RA _m = RD
_n (1) is output and digital stereo music signal DB
LB _m = LD _n (2), RB _m = RD _n (2)
Is output to the combining shift register 98,
D _n, a state of RD _n is stored.

The data of the combining shift register 98 is shifted at high speed according to the double speed bit clock HBCK, and LD
Serial output is made in the order of _n and RD _n . Therefore, the sampling frequency is 44.1kHz from the synthesis shift register 98.
A digital stereo music signal DD whose 32-bit length is one sample data is output. The digital stereo music signal DD is D / A converted by the D / A converter 99 for each channel, and then the amplifiers 100 and 101 are connected.
Is amplified for each channel by the
Sound is output from 03 for each channel.

According to this embodiment, the sampling frequency is 44.1 kHz, and the sample data string which constitutes the digital stereo music signal DD in which one sample data has a 32-bit length has MSB, 3SB,
5 SB, ... 31 SB is combined into one sub-sample data and 2 SB, 4 SB, 6 SB, ... Optical disc 1B for each of two subsample data strings
Are recorded on the groove portion 2A and the land portion 2B adjacent to each other so as to be simultaneously readable with the recording mark 3 (each system is the digital stereo music signals DA and DB of the sampling frequency 44.1 kHz). Then, the groove portion 2A and the land portion 2 of the optical disc 1B are used by the optical disc reproducing device.
The data recorded in B are read out at the same time, and the synthesizing circuit 93
Since the sub-sampled data of two systems are alternately arranged and synthesized into one 32-bit-long sample data to be output, the recording mark on the optical disc can be made small and the rotation speed of the optical disc can be increased. Even without doing so, it is possible to read data from the optical disc at a high transmission rate, and it is possible to reproduce sound with high quantization accuracy and extremely high sound quality. In this respect, when data is recorded only on one of the groove portion and the land portion, it is necessary to reduce the recording mark or increase the rotation speed of the optical disc in order to reproduce the data having a high sampling frequency. However, it is not possible to reduce the recording mark due to the restrictions on the manufacturing accuracy of the optical disk and the detection capability of the optical pickup, and in order to increase the rotation speed of the optical disk, the spindle motor must be large and the motor driver must be driven. The ability must be increased, and the burden on the configuration is large. In addition, the digital stereo music signal D of the groove portion 2A and the land portion 2B of the optical disc 1B.
A and the digital stereo music signal DB have recording position information (here, subcode Q channel A-time).
Are also recorded together, and the synchronizing circuit 50B uses the recording position information to synchronize the digital stereo music signal DA and the digital stereo music signal D at the same recording position.
Since B is output at the same time, the optical disc 1B
On the top of the groove 2A digital stereo music signal D
Even if there is a recording position shift in the track direction between A and the digital stereo music signal DB of the land portion 2B, no sound distortion occurs.

The sub-code Q channel P-ti
Since me also indicates the recording position on the optical disc 1B, the synchronization circuit 50B uses the P-ti instead of the A-time.
Even if me is used, two systems of digital stereo music signal D
A and DB can be synchronized. Further, as a modified example of the optical disc reproducing apparatus shown in FIG. 20, a sampling frequency of 44.1 kHz only in the groove portion 2A, a normal optical disc in which a 16-bit length digital stereo music signal DA is recorded, and a sampling frequency of 44.1 kHz, One sample data is a 32-bit long digital stereo music signal DD sample data string, and each sample data is MSB, 3SB, 5SB ,.
・ One sub-sample data combining 31SB,
By combining the 2SB, 4SB, 6SB, ... When it is desired to reproduce both the high density optical disc 1B recorded in the groove portion 2A and the land portion 2B which are adjacent to each other, as shown in FIG. 22, the digital stereo music signal DA output from the first digital signal processing circuit 30 is output. A D / A converter 104 for D / A converting is provided, and a changeover switch 105 for switching the output of the DA / converter 99 and the output of the D / A converter 104 is added. And the optical disc 1
Identification information of a normal disc and a high-density optical disc 1B is recorded in B as TOC information, and when the disc is set, a system controller (not shown) reads the identification information to determine the disc type, In the case of the optical disc 1B, the added changeover switch 105 is changed over to the D / A converter 99 side and the respective parts of the optical disc reproducing apparatus are operated as they are. In the case of a normal disc, the second digital signal processing circuit 40 and the synchronizing circuit 50
The operations of B, the synthesizing circuit 93, and the D / A converter 99 are stopped, and the changeover switch 105 is switched to the D / A converter 104 side to output the digital stereo music signal DA output from the first digital signal processing circuit 30. The D / A converter 104 may output the audio signal D / A converted.

Further, the sample data forming the digital stereo music signal DD may have other bit lengths such as 24 bit length and 36 bit length in addition to 32 bit length.
Further, the sample data of the n-bit length of the digital stereo music signal DD has the bit positions of MSB, 3SB, 5S.
Although sub-sampled data in which bit data of B, ... Is combined and sub-sampled data in which bit data of bit positions are 2SB, 4SB, 6SB are combined, it is divided into upper m bits of n-bit-long sample data. (However, m <n) is set as one sub-sample data,
Other divisions may be performed, such as using the lower (n−m) bits as another piece of subsample data. For example, each of the L and R sample data forming the digital stereo music signal DD has a 32-bit length, the upper 16 bits are one sub-sample data, and the lower 16 bits are another sub-sample data. The groove section 2 uses the upper 16-bit subsample data string as the digital stereo music signal DA and the lower 16-bit subsample data string as the digital stereo music signal DB.
When recorded in A and land section 2B, digital stereo music signals DA and DB are recorded from groove section 2A and land section 2B.
Are played at the same time, and after synchronizing with the synchronizing circuit 50B,
The synthesizing circuit 93C of FIG. 23 synthesizes the upper 16 bits and the lower 16 bits for L and R to restore the original 32-bit digital stereo music signal DD. Synthesis circuit 93C
Compared with the synthesizing circuit 93 of FIG. 20, MSB to LSB of the first shift register 94C are connected to MSB to 16SB of the synthesizing shift register 98C, and MSB to LSB of the third shift register 96C are synthesizing shift register. 98
It is connected to 17SB to 32SB of C, and the second shift register 9
5C MSB to LSB are combined shift registers 98C
Connected to 33SB-48SB, 4th shift register 97C
MSB to LSB are 49S of the shift register for synthesis 98C
The only difference is that they are connected to B to 64SB.

As shown in FIG. 18, the groove portion 2A
And digital land music signal D to both the land section 2B
Even the optical disc 1B in which A and DB are recorded can be reproduced by a normal CD player capable of reproducing a phase change optical disc if only the digital stereo music signal DA of the groove portion 2A. Similarly, the digital stereo music signal D
A sub-sample data string of upper m bits (where m <n) of n-bit sample data of D is a digital stereo music signal DA, and a sub-sample data string of lower (n−m) bits is a digital stereo music signal DB. In the case of the optical disc described above, only the digital stereo music signal DA in the groove portion can be reproduced by an ordinary CD player capable of reproducing the phase change optical disc. Also,
In each of the embodiments and the modifications described above, the transmission rate is increased by simultaneously reading the recording marks 3 from the land portion 2B and the groove portion 2A which are adjacent to each other on one side of the optical disc, but the adjacent land portion 2B is Simultaneous reading from the groove section 2A emits a plurality of laser beams 1
This is possible with one optical pickup 10, and unlike the case of using a plurality of optical pickups, it is not necessary to take the difficult configuration of aligning the access positions of the optical pickups with respect to the optical disc.

In each of the above-described embodiments and modifications, the case where a digital stereo music signal is recorded on the phase change optical disk is taken as an example, but the present invention is not limited to this, and text data, image data, etc. Other types of digital signals may be recorded. Further, the phase change optical disc has been described by way of example in which the digital signal can be recorded in the groove portion and the land portion only on one side, but the both sides may be capable of recording the digital signal in the groove portion and the land portion, respectively. Further, although the recording mark is formed on the groove portion and the land portion by the phase change, the recording mark may be formed by another method such as pit.

[0066]

According to the optical disk reproducing apparatus of the present invention,
Targeting an optical disc in which two lines of data are recorded on adjacent land portions and groove portions at the same time by using record marks that can be read simultaneously, recording mark detection means is used, and the land portions and grooves adjacent to each other are recorded. Since the recording marks recorded in the portion are simultaneously detected, the data recorded in the land portion and the data recorded in the groove portion are demodulated and output from the detection output by the first and second demodulating means. It is possible to multiplex the reproduction of data of two systems, and to perform advanced reproduction such as multichannel surround music reproduction, reproduction in which stereo accompaniment and stereo vocals are combined. Simultaneous reading of recording marks from the adjacent land portion and groove portion on one side of the optical disc can be performed by one recording mark detecting means (optical pickup) that emits a plurality of laser beams, and a plurality of recording mark detecting means can be obtained. It is not necessary to adopt the difficult structure of aligning the access position of each recording mark detecting means with respect to the optical disc as in the case of using the. Further, according to another optical disk reproducing apparatus, since the two demodulated outputs are mixed by the mixing means, it is possible to easily cope with a reproducing system having only one system of output means.

Further, according to still another optical disk reproducing apparatus, when the data of each system is recorded on the optical disk together with the recording position information, the first and second demodulating means detect the land from the detection output of the recording mark detecting means. The data recorded in the groove portion and the data recorded in the groove portion are demodulated and output together with the recording position information, and the synchronizing means uses the recording position information demodulated from the land portion and the recording position information demodulated from the groove portion. Since the demodulation output from the land part and the demodulation output from the groove part are synchronized with each other, even if the two systems of data are recorded at positions physically displaced from each other on the optical disc, they are multiplexed in synchronization. Can be played. Further, according to another optical disk reproducing apparatus, since the two outputs of the synchronizing means are mixed by the mixing means, it is possible to easily cope with a reproducing system having only one system of output means.

According to another optical disk reproducing apparatus,
A recording mark capable of being simultaneously read out to adjacent land portions and groove portions, in which every two sample data sequences having a sampling frequency of 2F _s are distributed to two systems, and the sample data sequences having a sampling frequency F _s of the two systems are one system at a time. Using the recording mark detection means, the recording marks recorded in the land portion and the groove portion adjacent to each other of the optical disc are simultaneously detected for the optical disc recorded in 1. and the first and second demodulation means detect the detected output. The sample data sequence of the sampling frequency F _s recorded in the land part and the sample data sequence of the sampling frequency F _s recorded in the groove part are demodulated, and the sample data of each system are alternately arranged by the synthesizing means to obtain the sampling frequency. Since the sample data string of 2F _s is output, the size of the recording mark is reduced. Therefore, data having a high sampling frequency can be easily reproduced without doubling the rotation speed of the optical disk. Further, according to another optical disk reproducing apparatus, when the sample data string of each system is recorded on the optical disk together with the recording position information, the first and second demodulating means move from the detection output of the recording mark detecting means to the land portion. The recorded sample data sequence and the sample data sequence recorded in the groove part are demodulated and output together with the recording position information, and the synchronization position demodulates the recording position information demodulated from the land part and the recording position information demodulated from the groove part. Is used to synchronize the demodulation output from the land portion with the demodulation output from the groove portion. After that, since the synthesizing means alternately synthesizes the sample data of the two systems, the sample data strings of the two systems should be synthesized at the correct positions even if they are recorded at positions physically displaced from each other on the optical disc. Therefore, data having a high sampling frequency can be accurately reproduced regardless of the deviation of the recording position between the land portion and the groove portion.

According to another optical disk reproducing apparatus,
For a sampling frequency F _s , for a sample data string in which one sample data has an n-bit length, each sample data is divided into two sub-sample data of an m-bit length and a (n−m) -bit length according to a bit position. Recording marks for an optical disc in which sub-sampling data strings of two systems are divided, and one recording system of the sub-sampling data strings of the two systems is recorded on adjacent land portions and groove portions with simultaneously readable recording marks. The recording means recorded on the land portion and the groove portion which are adjacent to each other on the optical disc are simultaneously detected by using the detecting means, and the sub-sample data string recorded on the land portion by the first and second demodulating means from the detected output, Demodulate the sub-sampled data sequence recorded in the groove part, and synthesize the sub-sampled data of each system by the synthesizing means. Since the original n-bit length sample data string is output, data with high quantization accuracy can be easily obtained without reducing the size of the recording mark or doubling the rotation speed of the optical disk. Can be played. Further, according to another optical disc reproducing apparatus, when the sub-sampled data sequence of each system recorded on the optical disc is recorded together with the recording position information, the first and second demodulating means detect the output of the recording mark detecting means. From the land portion and the sub-sample data row recorded in the groove portion are demodulated and output together with the recording position information, and the synchronizing means demodulates the recording position information from the land portion and the groove portion. Using the recording position information demodulated from, the demodulation output from the land portion and the demodulation output from the groove portion are synchronized. After that, since the synthesizing means synthesizes the two systems of sub-sampled data, even if the two systems of sub-sampled data strings are recorded at positions physically displaced from each other on the optical disc, they should be synthesized at the correct positions. Therefore, it is possible to accurately reproduce data with high quantization accuracy regardless of the deviation of the recording position between the land portion and the groove portion. Further, according to another optical disk reproducing apparatus, a sub-sample data string in which MSB, 3SB, 5SB, ... Are combined with a sampling frequency F _s , a sample data string in which one sample data has an n-bit length, 2SB, 4SB, 6
When a sequence of sub-sampled data combining SB ... Is recorded in the land portion and the groove portion of the optical disc, the synthesizing means alternately combines the bit data of the sub-sampled data of the two systems to the original n bits. Since the long sample data strings are combined, the data can be reproduced even if the sub sample data strings are read out only for the land part or the groove part.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of data recorded on a phase change optical disk according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a CD format.

FIG. 3 is a circuit diagram of an optical disk reproducing device according to the first embodiment of the present invention.

FIG. 4 is an operation explanatory diagram of the first and second digital signal processing circuits of FIG.

5 is a specific circuit diagram of the synchronization circuit of FIG.

6 is an explanatory diagram of the operation of the synchronization circuit of FIG.

7 is an explanatory diagram of data stored in a first ring buffer of the synchronization circuit of FIG.

8 is an explanatory diagram of data stored in a first management memory of the synchronization circuit of FIG.

9 is an explanatory diagram of data stored in a second ring buffer of the synchronization circuit of FIG.

10 is an explanatory diagram of data stored in a second management memory of the synchronization circuit of FIG.

11 is an explanatory diagram of the operation of the synchronization circuit of FIG.

FIG. 12 is a partially omitted circuit diagram showing a modified example of the optical disc reproducing apparatus of FIG.

FIG. 13 is a partially omitted circuit diagram showing another modified example of the optical disc reproducing apparatus of FIG.

FIG. 14 is an explanatory diagram of data recorded on the phase change optical disk according to the second embodiment of the present invention.

FIG. 15 is a partially omitted circuit diagram of an optical disk reproducing device according to a second embodiment of the present invention.

16 is an operation explanatory diagram of the synchronization circuit of FIG.

17 is a partially omitted circuit diagram showing a modified example of the optical disc reproducing apparatus of FIG.

FIG. 18 is an explanatory diagram of data recorded on the phase change optical disc according to the third embodiment of the present invention.

19 is an explanatory diagram of data recorded on a track of the phase change optical disc of FIG.

FIG. 20 is a circuit diagram in which a part of the optical disc reproducing apparatus according to the third embodiment of the present invention is omitted.

21 is an explanatory diagram of the operation of the synchronization circuit of FIG.

22 is a partially omitted circuit diagram showing a modified example of the optical disk reproducing device of FIG. 20. FIG.

23 is a partially omitted circuit diagram showing another modified example of the optical disc reproducing apparatus of FIG. 20. FIG.

[Explanation of symbols]

1, 1A, 1B Phase change optical disk 2A, 2A _i Groove part 2B, 2B _i land part 10 Optical pickup 20 RF amplifier 30 First digital signal processing circuit 40 Second digital signal processing circuit 50, 50A, 5
0B Synchronous circuit 60 First D / A converter 61 Second D / A
Converter 70, 92, 105 Changeover switch 71 Mixing circuit 80, 93, 93
C synthesis circuit 86, 91, 99, 104 D / A converter

Claims (9)

[Claims] 1. An optical disk reproducing apparatus for reproducing an optical disk in which data of two systems related to each other are recorded on adjacent land portions and groove portions by simultaneously readable record marks, in an optical disk reproducing apparatus. And a recording mark detecting means for simultaneously detecting the recording marks recorded in the groove portion, a first demodulating means for demodulating and outputting the data recorded in the land portion from the detection output of the recording mark detecting means, and a recording mark detecting means. And a second demodulating means for demodulating and outputting the data recorded in the groove portion from the detection output of the optical disc reproducing apparatus. 2. The optical disk reproducing apparatus according to claim 1, further comprising mixing means for mixing the output of the first demodulating means and the output of the second demodulating means. 3. An optical disk reproducing apparatus for reproducing an optical disk in which data of two systems related to each other are recorded with recordable position information and simultaneously readable recording marks in adjacent land portions and groove portions together with recording position information. A recording mark detecting means for simultaneously detecting recording marks recorded on a land portion and a groove portion of an optical disc, and demodulating and outputting data recorded on the land portion and recording position information from the detection output of the recording mark detecting means. Demodulation means, second demodulation means for demodulating and outputting the data and recording position information recorded in the groove portion from the detection output of the recording mark detecting means, recording position information demodulated from the land portion and recording demodulated from the groove portion Synchronization means for synchronizing the demodulation output from the land portion and the demodulation output from the groove portion using the position information. Optical disk reproducing apparatus according to claim and. 4. The optical disk reproducing apparatus according to claim 3, further comprising mixing means for mixing the two outputs of the synchronizing means. 5. A sample data string having a sampling frequency of 2F _s is distributed to every other two systems, and each of the two systems has a sample data string of the sampling frequency F _s , one system at a time, and a land part and a groove part which are adjacent to each other. In an optical disc reproducing apparatus for reproducing an optical disc recorded with simultaneously readable record marks, a record mark detecting means for simultaneously detecting record marks recorded in a land portion and a groove portion of the optical disc, and detection by the record mark detecting means First demodulation means for demodulating and outputting a sample data sequence recorded in the land portion from the output, and second demodulation means for demodulating and outputting the sample data sequence recorded in the groove portion from the detection output of the recording mark detection means. And the sample data demodulated by the first demodulating means and the sample data demodulated by the second demodulating means are alternately arranged. , An optical disc reproducing apparatus characterized by comprising synthesizing means for outputting the synthesized sample data sequence of the sampling frequency 2F _s, a. 6. A land adjacent to each other along with recording position information, in which every two sample data strings having a sampling frequency 2F _s are distributed to two systems, and each of the two systems has a sample data string having a sampling frequency F _s and one system. In an optical disc reproducing apparatus for reproducing an optical disc recorded with record marks that can be read out simultaneously in a groove portion and a groove portion, recording mark detecting means for simultaneously detecting recording marks recorded in a land portion and a groove portion of the optical disc, and a recording mark First demodulating means for demodulating and outputting a sample data sequence and recording position information recorded in the land portion from the detection output of the detecting means, and a sample data sequence and recording recorded in the groove portion from the detection output of the recording mark detecting means Second demodulation means for demodulating and outputting the position information, and recording position information and glue demodulated from the land portion. By using the recording position information demodulated from the section, the synchronizing means for synchronizing the sample data sequence demodulated from the land part and the sample data sequence demodulated from the groove part, and the sample data of two systems synchronized by the synchronizing means are provided. An optical disc reproducing apparatus comprising: a synthesizing unit that is alternately arranged and synthesizes and outputs a sample data string having a sampling frequency of 2F _s . 7. A sampling frequency F _s , for a sample data string in which one sample data has an n-bit length, each sample data has an m-bit length and (n
-M) By dividing into two sub-sample data of bit length, it is divided into two series of sub-sample data strings,
In an optical disc reproducing apparatus for reproducing an optical disc in which a sub-sampled data sequence of each system is recorded in a land and a groove which are adjacent to each other at the same time by a readable record mark, it is recorded in the land and the groove of the optical disc. From the detection output of the recording mark detection means for simultaneously detecting the recording marks, the first demodulation means for demodulating and outputting the sub-sampled data sequence recorded in the land portion from the detection output of the recording mark detection means The second demodulation means for demodulating and outputting the sub-sampled data sequence recorded in the groove part, the sub-sampled data demodulated from the land part and the sub-sampled data demodulated from the groove part to synthesize the original n-bit length sample An optical disk reproducing apparatus comprising: a synthesizing unit that outputs a data string. 8. A sampling frequency F _s , for a sample data string in which one sample data has an n-bit length, each sample data has an m-bit length and (n
-M) By dividing into two sub-sample data of bit length, it is divided into two series of sub-sample data strings,
In an optical disc reproducing apparatus for reproducing an optical disc in which sub-sampling data strings of each system are recorded together with recording position information in a land portion and a groove portion which are adjacent to each other with simultaneously readable recording marks, the land portion and the groove portion of the optical disc are recorded. Recording mark detection means for simultaneously detecting the recording marks recorded on the recording mark detection means, and demodulating and outputting the sub-sampled data sequence of m-bit length unit recorded on the land portion and the recording position information from the detection output of the recording mark detection means. 1 demodulation means, a second demodulation means for demodulating and outputting a sub-sampled data sequence (n-m) bit length unit recorded in the groove portion and recording position information from the detection output of the recording mark detection means, and a land portion Using the recording position information demodulated from and the recording position information demodulated from the groove part, the subsample demodulated from the land part is used. And a synthesizing means for synthesizing the sub-sample data of two systems outputted from the synchronizing means and outputting the original sample data sequence of n-bit length. An optical disk reproducing device comprising: 9. The MSB of n-bit-long sample data,
3 SB, 5 SB ... Are combined to form one sub-sample data, and 2 SB of n-bit length sample data,
9. The optical disc reproducing apparatus according to claim 7, wherein 4SB, 6SB, ... Are combined to form another sub sample data.