JPH02281473A - Reproducing device and manufacturing device for disk - Google Patents

Abstract

PURPOSE:To increase a high sound frequency band by dividing a disk into parts for an odd signal and an even signal, and reading and reproducing the odd and even signals which are recorded while both disks are rotated synchronously. CONSTITUTION:The odd and even signal disks 1o and 1e where the odd and even signals are recorded are rotated synchronously under the control of rotation control parts 11 through motors 7 of odd and even signal disk reproduction control parts 3o and 3e. Then the signals which are read out of the disks 1o and 1e by optical systems 9 are amplified through RF amplifier and PLL circuit parts 17 to regenerate clocks, and demodulating circuits 19 perform demodulation and array the signals, which are amplified and outputted synchronously. Consequently, the reproducing device for the disks 1o and 1e whose high sound frequency bands are increased is obtained.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a reproduction device and a manufacturing device for discs divided into odd-number signal discs and even-number signal discs, and more specifically, From an odd signal disk where an odd signal sampled with an odd sampling signal is modulated and recorded, and an even signal disk where an even signal sampled is modulated and recorded with an even sampling signal that occurs at the intersection of the odd sampling signal. The present invention relates to a disc reproducing apparatus that reproduces signals separately, and a disc manufacturing apparatus that manufactures the odd signal and coefficient signal discs.

(Prior Art) Compact discs (CDs) are the most popular digital audio discs, with their dynamic range and distortion significantly improved compared to conventional records, excellent sound quality, and small size. It is widespread.

A compact disc has 44 left and right 2 channel signals.
．． Using a sampling frequency of 1 kHz, it is possible to record up to 20 kHz in the audible frequency band, and it is possible to perform high-density recording for 60 to 75 minutes on one single-sided sheet.

Compact discs record left and right two-channel signals, for example, as E F M (Eight to Fou).
rteenModulatlon) modulation.
588 bits consisting of data bits and channel bits as shown in Figure (b) are recorded as one frame. The bit rate in this case is approximately 1.936Mb/S
It is. Since compact discs record in a signal format in which one frame has 588 bits, it is possible to record only two left and right channels of signals up to a frequency range of 20 kHz.

By the way, it has been said that the human sense of hearing generally does not respond to sounds above 20 kHz, but even sounds above 20 kHz are transmitted to the brain through the skin near the ear and the pinna,
It is known that listening to music containing ultrasonic waves of kHz or higher increases alpha waves in brain waves.

(Problems to be Solved by the Invention) Conventional compact discs can only record two left and right channel signals up to a sound range of 20kHz, but as mentioned above, for example, due to the increase in alpha waves, it is possible to record even higher frequency ranges. For example, there is a desire to increase the frequency to 40kHz.

The present invention has been made in view of the above, and its object is to divide a disk into an odd signal disk and an even signal disk, and alternately generate odd sampling signals and even sampling signals to be recorded. To provide a disk reproducing device and a manufacturing device in which the treble frequency range is increased by recording odd signals obtained by sampling signals on an odd signal disk and recording even signals on an even signal disk.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, a disc playback device of the present invention provides an odd signal disc in which an odd signal sampled with an odd sampling signal is modulated and recorded, and A disc playback device that reads out and reproduces signals separately from a disc for even-numbered signals recorded by modulating even-numbered signals sampled with alternately generated even-numbered sampling signals, the disc for the odd-numbered signals and for the even-numbered signals. Rotating means for rotating the disks in synchronization with each other; Odd signal and even signal reading for reading out the odd signal and even multiple number recorded on the odd signal and even signal disks, respectively, which are rotated in synchronization by the rotating means. means for demodulating the odd and even signals respectively read out by the odd signal and even signal reading means; and odd signals demodulated by the odd signal and even signal demodulating means, respectively. and an odd-even signal sorting means for sorting even-numbered signals; a separation means for separating left and right channel signals from the output signals sorted by the odd-even signal sorting means; and a separation means for separating left and right channel signals, respectively. and amplifying means for respectively amplifying and outputting the left and right channel signals.

Further, the disk manufacturing apparatus of the present invention includes a sampling means for sampling a signal to be recorded using an odd sampling signal and an even sampling signal that is generated alternately with the odd sampling signal, and a sampling means that samples the signal to be recorded using the odd sampling signal and the even sampling signal. Odd signal and even signal modulation means for respectively modulating the odd and even signals sampled by the signal, and the odd signal for rotating the odd signal and even signal disk masters in synchronization for recording the odd and even signals, respectively. and even signal disk rotation means;
A laser that outputs a laser beam for recording signals on the master disks for odd and even signals rotated synchronously by the disk rotation means for odd and even signals, and a laser beam output from the laser. Odd signal and even signal optical modulation means for optically modulating output signals for odd and even signals from the odd signal and even signal modulation means, respectively; and odd signals optically modulated by the odd signal and even signal optical modulation means, respectively. and an optical system for odd and even signals that records odd and even signals by irradiating the even signal optical modulation signal onto desired positions on the disk master for odd and even signals, respectively. shall be.

(Function) In the disk reproducing apparatus of the present invention, the disk is divided into an odd signal disk and an even signal disk, and while both disks are rotated synchronously, the odd signal recorded on the odd signal disk and the even signal disk is reproduced. The even-numbered signals are read out, demodulated, and aligned, and both signals are amplified and output in synchronization.

In the disc manufacturing apparatus of the present invention, a master disc is divided into a master disc for odd-numbered signals and a master disc for even-numbered signals, and while both master discs are rotated synchronously, signals to be recorded on both master discs are sampled as odd and even numbers. The odd and even signals sampled by the signal are modulated, and the laser beam is optically modulated with the modulated signals of the odd and even signals to produce the disc master for the odd and even signals through the optical system for the odd and even signals. The desired position above is irradiated and recorded.

(Example) Hereinafter, in explaining the present invention in detail using the drawings, the principle of the present invention will first be explained using FIGS. 3 to 5.

Figure 3(b) shows the left channel L in a conventional disc.
and the right channel R signal is sampled at a sampling frequency of 44.1kHz to obtain 20kHz of the audible frequency band.
FIG. 3 is a diagram showing the waveforms of the left and right two channel signals, R and these signals, and the relationship between the sampling signals Ll, L2°, . . . and R1, R2, . As shown in the figure, the left channel signal is 44
．． It shows that the right channel signal R is sampled with 1 kHz sampling signals Ll, L2°, and the right channel signal R is sampled with 44° 1 kHz sampling signals R1, R2°.

On the other hand, in the present invention, as shown in FIG. 3(a), the left channel signal R and the right channel signal R
is sampled at a sampling frequency of 88.2 kHz, which is twice the conventional sampling frequency, thereby making it possible to record and reproduce up to a treble frequency band of 40 kHz, which is twice the conventional sampling frequency. That is, in FIG. 3(a), the left channel signal L is the odd sampling signal L for the left channel that is generated alternately.
10, L20. L30. . . . and even sampling signals LIE, L2E, L3E for the left channel.

φ..., and the right channel signal R is similarly generated alternately by the right channel odd sampling signals RIO, R20, R30°@11φ and the right channel even sampling signals RIE, R2H, R.
The data are sampled alternately and sequentially at 2H,. Odd sampling signals for left channel LIO, L20. L30.
...and even sampling signal L for the left channel
I.E.

L2E, L3E, --- are each 44.1 kHz, but by alternately generating and sampling both signals, the sampling frequency for the left channel signal becomes 88.2 kHz, which is double the conventional one. Odd sampling signals for channels RIO, R20, R30, φ
- and even sampling signal RIE for the right channel,
R2H.

R2H, --- are each 44.1 kHz, but by generating and sampling both signals alternately and sequentially, the sampling frequency for the left channel signal becomes 88.2 kHz, which is double the conventional one. 4
It can be increased up to 0kHz.

As described above, by sampling the signal to be recorded with the 44.1kHz odd sampling signal and even sampling signal, an odd signal and an even signal are respectively formed, and the odd signal and even signal are separated, and the odd signal is are recorded on the odd signal disk, and even signals are recorded separately on the even signal disk. That is, the disk is divided into two disks, one for odd-numbered signals and one for even-numbered signals.

FIG. 4(b) shows a conventional frame configuration consisting of 588 bits in which the signals of the two left and right channels to be recorded are EFM-modulated and recorded as described above, and the information bits for the right channel include the information bits for the right channel. sampling signal R
1 to R6 are set, and left channel sampling signals L1 to L6 are set to the left channel information bits.

On the other hand, FIGS. 4(a-1) and 4(a-2) show the frame structure in the case of the present invention, but are they the same?

As shown, the disk is divided into an odd signal disk and an even signal disk, and the right channel odd sampling signals RIO to R60 are set in the right channel information bits of the odd signal disk, and the information bits for the left channel are set in the right channel information bits. is the odd sampling signal LIO~L for the left channel.
60 is set. Further, the right channel information bit of the even signal disk is set to the right channel even sampling signal RIE-R2H, and the left channel information bit is set to the left channel even sampling signal LIE-L6E. .

As described above, the signal to be recorded is recorded at a sampling frequency of 4
When playing back an odd signal disk and a coefficient signal disk, which are recorded separately into odd and even signals obtained by sampling with a 4.1kHz sampling signal, the reproduced odd and even signals are are arranged alternately in synchronization with a frame synchronization signal, and the D/A
By converting, an audio signal having a high frequency range up to 40 kHz can be obtained.

That is, FIGS. 5(a-1) and (a-2) show the odd signals L10 to L60 and RIO to R60 and the even signals LIE-L6E and RIE-R2H reproduced from the odd signal disk and the even signal disk, respectively. The audio data arranged for each left and right channel and each having a frequency band of 20 kHz is shown, and these odd and even signals are divided into odd numbers,
By arranging them alternately in even numbers, odd numbers, even numbers, etc., it is possible to obtain audio signal data having a high frequency band of 40 kHz. Note that FIG. 5(b) shows the alignment of left and right channel signals on a conventional disc, but the frequency band in this case is 2QkHz.
It is.

Next, a disc reproducing apparatus according to an embodiment of the present invention will be described with reference to FIG. The disc reproducing apparatus shown in the figure uses two discs, which are an odd signal disc 10 and a copy number signal disc 1e, each recording an odd number signal and an even number signal, respectively, as described above.
These two disks are played back separately, and there is an odd signal disk playback control section 30 that plays back the odd signals recorded on the odd signal disk 10, and an even signal that is recorded on the even signal disk 1e. an odd-even signal reproduction control section 4 that alternately aligns and reproduces both odd-numbered signals and even-numbered signals, the double-sided fins 3o and 3e, and the odd-even signal reproduction control section. 4, two parts 5a and 5b commonly controlling
and a common control section 5, which is shown divided into two. In addition, disk 1 for odd number signals and even number signals
The signals recorded on the signals o and 1e are, for example, EFM modulated and recorded.

The disk playback control section 3o for odd-numbered signals and the disk playback control section 3e for even-numbered signals have the same configuration.
The incident light 9a is irradiated to the motor 7 that rotationally drives the disks lo and le, respectively, and the disk l
The respective reflected lights b from o and le are detected and the discs lo and
It has an optical system 9 that optically reads out the signals recorded on the respective channels. Further, the motor 7 is controlled by a rotation control section 11, and the optical system 9 is controlled by a feed control section 13.
, 1e are controlled in the radial direction, and a trace control section 15 performs focusing and tracking control for the disk 10.degree. 1e.

Further, the modulated signals from the disks io and le read by the optical system 9 are supplied to the RF amplifier/PLL circuit section 17 and amplified, and after the clock is regenerated, the modulated signals are supplied to the demodulation circuit 19. The demodulation circuit 19 demodulates, for example, EFM-modulated signals read from the disks 1o and le, converts them into data bits, and supplies the data bits to the data control/interpolation circuit section 21. The data control/interpolation circuit unit 21, together with the error correction unit 23, performs error data detection, correction and interpolation processing on the data demodulated by the demodulation circuit 19, and supplies the data to the odd-even signal reproduction unit 4. Data control/
The signal subjected to error detection and correction interpolation processing by the interpolation circuit section 21 is supplied to the odd-even selection circuit 35 of the odd-even signal reproduction control section 4, where it selects an odd number signal, an even number signal, an odd number signal and a one-even number signal. It is classified and selected and output.

The odd signals classified and selected by the odd-even selection circuit 35 are supplied to the alignment circuit 45 of the disk playback control section 3o for odd signals, and the even signals are supplied to the alignment circuit 45 of the disk playback control section 3o for even signals.
The odd and even signals are supplied to the odd-even signal alignment circuit 37 of the odd-even signal reproduction control section 4, and each signal is aligned in each alignment circuit as shown in FIG. It will be done.

Each signal aligned by each alignment circuit is
That is, the odd-number signal disc playback control unit 3o, the even-number signal disc playback control unit 3e, and the corresponding L-R separation circuits 47 of the odd-even signal playback control unit 4 separate the left channel signal and the right channel signal, and the separated signal is The left channel and right channel signals are converted into analog signals by an L-D/A converter 25L and an R-D/A converter 25R, respectively, and further amplified and outputted by an L audio amplifier 27L and an R audio amplifier 27R, respectively. It is output from a speaker or the like (not shown).

More specifically, the odd signal selected by the odd-even selection circuit 35 is selected by the alignment circuit 4 of the odd-signal disc playback control section 30.
5, further separated by an L-R separation circuit 47,
As shown in FIG. 5(a-1), the L-D/
A converter 25L and R-D/A converter 25R
is converted into an analog signal by the L audio amplifier 27.
The signal is amplified by the L and R audio amplifiers 27R and output.

The even signals selected by the odd-even selection circuit 35 are sorted by the alignment circuit 45 of the even signal disk playback control section 3e, and further separated by the L-R separation circuit 47, as shown in FIG. 5(a-2).
The L-D/A converter 25 is arranged and layered as shown in FIG.
It is converted into an analog signal by the L and R-D/A converters 25R, amplified by the L audio amplifier 27L and the R audio amplifier 27R, and output.

Further, the odd and even signals selected by the odd-even selection circuit 35 are transferred to the odd-even signal alignment circuit 3 of the odd-even signal reproduction control section 4.
7, further separated by an L-R separation circuit 47,
As shown in FIG. 5(a-3), the L-D/
A converter 25L and R-D/A converter 25R
is converted into an analog signal by the L audio amplifier 27.
The signal is amplified by the L and R audio amplifiers 27R and output.

Further, the common control unit 5 (5a, 5b) has a microcomputer 29, a memory 31, and an operation display unit 33,
The microcomputer 29 and memory 31 perform error detection and correction interpolation processing of the demodulated data via the data control/interpolation circuit section 21, rotation control of the motor 7 via the rotation control section 11, and other various controls. The operation display section 33 has operation buttons, display lamps, and the like, and is configured to perform various operation controls via the microcomputer 29 and display the statuses generated by the various controls. Further, the motor 7 of the disk playback control section 30 for odd-numbered signals and the motor 7 of the disk playback control section 3e for even-numbered signals rotate in synchronization with each other under the control of two microcomputers via the rotation control section 11. Signals read from the signal disk 10 and the even-numbered signal disk 1e are also read out in synchronization with each other.

The disk reproducing apparatus configured as described above includes an odd signal disk 10 and an even signal disk 1 on which only odd signals and even signals are respectively recorded.
e are rotated synchronously with each other under the control of the respective rotation control sections 1] via the respective motors 7 of the odd-numbered signal disk reproduction control section 30 and the even-numbered signal disk reproduction control section 3e. By control, each incident light beam 9a from each optical system 9 is irradiated onto a desired position on the disks lo, le while controlling focusing and tracking by the trace control unit]5, and
Detect and read each reflected light b from the optical system 9,
Each signal from the read disk 10.1e is amplified and clocked through each RF amplifier/PLL circuit section 17, demodulated by one demodulation circuit, and then each data control/interpolation circuit section 21 and Each error correction unit 2
In step 3, the error data is subjected to detection, correction and interpolation processing, and is supplied to the odd-even selection circuit 35. As described above, the odd-even selection circuit 35 classifies and selects odd signals, even signals, odd signals and even signals, supplies the odd signals to the alignment circuit 45 of the disk playback control section 30 for odd signals, and The signal is supplied to the alignment circuit 45 of the even signal disc reproduction control section 3e, and the odd and even signals are further supplied to the odd-even signal alignment circuit 37 of the odd-even signal reproduction control section 4.

The alignment circuit 45 of the odd-number signal disc playback control section 30 is as follows:
The odd signals fed together are arranged through the odd-even selection circuit 35, and further separated into left channel and right channel signals by the L-R separation circuit 47, and then the left and right channel signals are sent to the L-D/A converter, respectively. 25L and R-D/
The A converter 25R converts the left and right channel analog signals, and the L audio amplifier 27 respectively
The L and R audio amplifiers 27R amplify the signal and output it as left and right channel signals from a speaker (not shown) or the like.

On the other hand, the alignment circuit 4 of the even-numbered signal disc playback control section 3e
5 sorts the coefficient signals supplied through the odd-even selection circuit 35, further separates them into left channel and right channel signals in the L-R separation circuit 47, and then sends the left and right channel signals to the LD/A converter 25L, respectively. and R-D
/A converter 25R converts the left and right channel analog signals, and L audio amplifier 2 respectively.
7L and R audio amplifiers 27R, and output as left and right channel signals from speakers, etc. (not shown).

As described above, the odd signals and even signals output after being reproduced and amplified by the odd signal disc playback control unit 30 and the even signal disc playback control unit 3e are each sampled with a 44.1 kHz sampling signal and recorded. The signals are reproduced and amplified, and each signal itself has a frequency band of 20kHz, and both signals can be played on a normal CD player, but by synchronizing and playing them as described above, It is reproduced as excellent audio sound in the high frequency range up to 40kHz.

Further, in the odd-even signal reproduction control section 4, the odd-even signals and even signals selected by the odd-even selection circuit 35 are alternately arranged in an odd-even signal separation circuit 37, and then the L-R separation circuit 3
The left and right channel signals are then converted into left and right channel analog signals by the L-D/A converter 25L and the R-D/A converter 25R, respectively. The signals are amplified by an audio amplifier 27L and an R audio amplifier 27R, and output as left and right channel signals from a speaker (not shown) or the like.

The signal output in this way is of course the result of alternately arranging both the odd and even signals sampled by the 44.1kHz sampling signal, so it is 88.2kHz.
It is the same as that sampled with the z sampling signal, and is reproduced as an excellent audio sound with a high frequency range of up to 4QkHz, which is approximately twice the conventional sound.

FIG. 2 is a block diagram showing the configuration of a disk manufacturing apparatus according to another embodiment of the present invention. The disk manufacturing apparatus shown in the figure divides the signals to be recorded into odd and even signals as described above, records the negative odd signal on the odd signal disk master 2000, and records the other even signal on the even signal. An odd signal disk recording control unit 203o records odd signals on the signal disk master 200e, and an even signal disk records the even signals on the even signal disk master 200e. Recording control section 203e and both side flap sections 203o, 203
It also includes a common control section 205 that commonly controls the signals e.

The common control unit 205 controls the disk masters 200 . For example, 40 to be recorded in o, 200e.
An audio input signal containing frequencies higher than kHz is provided, and the audio input signal is passed through a low pass filter 30.
1 cuts signals of 40 kHz or more, and then samples them at a sampling frequency of 88.2 kHz in a sample hold circuit 303 as shown in FIG. 3(a), and supplies them to an odd-even signal separation circuit 305. In this separation circuit 305, the signals sampled at a sampling frequency of 88.2 kHz are alternately used as odd and even signals, that is, as shown in FIG. 3(a) (7) LIO, L2.
0.・/RIO, R20° medium and LIE, L2E
, RIE, R2E, are alternately separated into odd-numbered signals and even-numbered signals as shown by . The odd and even signals thus separated are each 44.1kHz.
The odd signal is supplied to the A/D converter 51 of the disk recording control section 203o for odd signals, and the even signal is supplied to the A/D converter 50 of the disk recording control section 203e for even signals. be done.

Further, the odd-numbered signal disc recording control unit 203° and the even-numbered signal disc recording control unit 203e have the same configuration, and each has a motor 73 that rotationally drives the disc masters 200o and 200e. They are rotated and driven in synchronization by a rotating 3'fIgrJ section 99, respectively. Further, signals are recorded on each of the master disks 200o and 200e through an optical system 63, and this optical system 63 is controlled by eight trace control units for focusing and tracking, and a radial feed servo control unit. The radial position of the disk masters 200o and 200e is controlled to be moved by a radial feed motor 85 via a motor 87.

Furthermore, as described above, the odd-even signal separation circuit 305 of the common control unit 205 connects each A/D converter 5 of the odd-signal and even-signal disk recording control units 203o and 203e.
The odd-numbered signals and even-numbered signals supplied to the circuit 1 are each converted into digital signals, and subjected to error detection and correction interpolation processing from each A/D converter 51 to each data control/interpolation circuit section 53, and then subjected to EFM modulation, for example, by each modulation circuit 55. be done. The odd and even signals modulated by each modulation circuit 55 are supplied to the optical modulator 5-9 and trace control section 89 via each PLLN path 57, respectively. Each optical modulator 59 optically modulates the recording laser beam from the argon laser 97 of the common control unit 45 with each modulation signal from each PLL circuit 57, and transmits each optically modulated signal from the beam splitter 61 to the optical system 63. concave lens 67, recording lens 69
The light is irradiated onto the master disks 200o and 20Oe through the radiator, and the modulated odd and even signals are respectively recorded on the master disks 200o and 20Oe. In this case, the disc master 200o
.
The radial position control and tracking control of the disk masters 200o and 200e are performed by this. Note that the focus servo control section 65 is He-
A beam splitter 77 that shunts the laser beam from the Ne laser 75 and the He-Ne laser 75, and one of the laser beams shunted by the beam splitter 77 is sent to the disk master 200o through the recording lens 69.
Concave lens 79 and reflective mirror 71 that illuminate 200e
, a photodetector 81 that detects the other laser beam from the beam splitter 77, and a lens control system 83 that controls six recording lenses in response to the output signal of the photodetector 81. There is.

In addition to the above-described configuration, the common control section 45 has a microcomputer 91, a memory 93, an operation display section 95, and an argon laser 97.
Motor 73 for Oo and disk master 20 for even-numbered signals
It performs various controls such as synchronous rotation control of the motor 73 for 0e, error detection correction interpolation processing via the data control/interpolation circuit section 53, and overall control operations. The operation display section 95 has operation buttons, display lamps, etc., and is configured to perform various operation controls via the microcomputer 91 and to display the statuses generated by the various controls.

In the disk manufacturing apparatus configured as described above, a disk master 200o for odd-numbered signals and for even-numbered signals,
200e to each motor 73 under the control of each rotation control unit 99.
The audio signal to be recorded is supplied from the low-pass filter 301 to the sample hold circuit 303 while being rotated synchronously via the low-pass filter 301, sampled at a sampling frequency of 88.2 kHz, and the sampled signal is sent to the odd-even signal separation circuit 305. to separate odd and even signals. Then, among the separated signals, the odd number signal is supplied to the A/D converter 51 of the odd signal disk recording control section 203o, and the even number signal is supplied to the A/D converter 51 of the even signal disk recording control section 203e. Convert to digital signal. The odd number signal and even number signal converted into digital signals pass through each data control/interpolation circuit section 53 of the odd number signal disk recording control section 203o and the even number signal disk recording control section 203e, respectively, and then are input to each modulation circuit 55. EFM modulated and converted into channel bits, supplied to each of the five optical modulators via each PLL circuit 57, and in each of the five optical modulators, the laser beam from the argon laser 97 is optically modulated by each modulation signal, This optically modulated laser beam is sent to a beam splitter 61,
The light is irradiated onto the odd signal and even signal disk masters 200o and 20Oe through the optical system 63, thereby recording odd and even signals on the odd and even signal disks 200o and 200e, respectively. In addition, in this recording operation, each radial feed motor 85
The radial position control and tracking control of each disk master 200o and 200e are performed by the servo control section 65, and focusing control is performed by the focus servo control section 65.

As mentioned above, the odd signal and even signal disks on which each signal was sampled at a sampling frequency of 88:2 kHz and then separated into odd and even signals are separated into odd and even signals. 44
．． Since it has a sampling frequency of 1 kHz, if both discs are played back at the same time, it will have a frequency band of 40 kHz, which is about twice the conventional frequency band.

In the above embodiment, two disks are used, one for odd signals and one for even signals, but the odd and even signals are recorded on the front and back sides of one disk, respectively. The same is true.

〔Effect of the invention〕

As explained above, according to the present invention, a disk is divided into an odd signal disk and a coefficient signal disk, and while both disks are rotated synchronously, odd signals are recorded on the odd signal disk and the even signal disk. read out and demodulate the even signals, align them, amplify and play both signals in synchronization, or divide the master disk into a master disk for odd-number signals and a master disk for even-number signals, and synchronize both master disks. While rotating, the signals to be recorded on both master disks are sampled using odd and even sampling signals, and the odd and even signals are modulated, and the modulation signals of the odd and even signals are used to optically modulate the laser beam to obtain the signals for the odd signals and the coefficients. Since recording is performed by irradiating the desired positions on the disk master for odd and even signals through a signal optical system, the high frequency band can be increased to, for example, 40 kHz, which is approximately twice the conventional frequency range. It is possible to obtain audio sound with an excellent range of sound, and since only the odd and even signals are sampled at the same sampling frequency as before, it can be played on a regular CD player, and it can be played on a dedicated CD player. There is no need to use a playback device.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a disc reproducing apparatus according to one embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a disc manufacturing apparatus according to another embodiment of the present invention,
Fig. 3 is a diagram showing the waveform of the signal to be recorded and its sampling signal, Fig. 4 is a diagram showing the signal format recorded on the disk, and Fig. 5 is a diagram showing the signal data arranged for each left and right channel. . 10... Disk for odd number signals, 1e... Disk for even number signals, 3o... Disk playback control unit for odd number signals, 3e...
Disc playback control unit for even signals 3.4... Odd-even signal playback control unit, 35... Front selection circuit, 37... Odd-even signal alignment circuit, 45... Alignment circuit, 47... L-R separation Circuit, 200o...Disk master for odd number signals, 200e...
・Disk master for even number signals, 203o...Disk recording control unit for odd number signals, 203e...Disc recording control unit for even number signals, 205...Common control unit, 303φφ-sample hold circuit, 305...Odd-even Signal separation circuit. Figure 3 (a) Agent Patent Attorney Hidekazu Miyoshi Figure 3 (b) Figure 4 (a-2) Figure 4 (a-1) Figure 4 (b) Figure 5 (a-1) Figure 5 (a-3) Figure 5 (a-2) @ Figure 5 (b)

Claims (2)

[Claims] (1) A disk for odd signals recorded by modulating an odd signal sampled with an odd sampling signal, and a disk for even signals recorded by modulating an even signal sampled with an even sampling signal that occurs alternately with the odd sampling signal. A disc playback device that reads and reproduces signals from each disc separately, comprising a rotating means for rotating the odd signal disc and an even signal disc in synchronization with each other, and an odd number disc that is rotated in synchronization by the rotating means. Odd signal and even signal reading means for reading odd and even signals respectively recorded on the signal and even signal disks, and odd and even signals respectively read by the odd and even signal reading means. Odd signal and even signal demodulation means for demodulating, odd and even signal alignment means for aligning the odd and even signals demodulated by the odd and even signal demodulation means, and alignment by the odd and even signal alignment means. and amplifying means for respectively amplifying and outputting the left and right channel signals separated by the separating means, respectively. Device. (2) sampling means for sampling a signal to be recorded using an odd sampling signal and an even sampling signal that is generated alternately with the odd sampling signal; and an odd signal sampled by the odd sampling signal and the even sampling signal in the sampling means; Odd signal and even signal modulation means for modulating even signals, respectively, and odd signal and even signal disk rotation means for synchronously rotating the odd signal and even signal disk masters for recording odd and even signals, respectively. a laser that outputs a laser beam for recording signals on the odd-number signal and even-number signal disk master discs that are rotated synchronously by the odd-number signal and even-number signal disk rotation means; and a laser output from the laser. Odd signal and even signal optical modulation means for optically modulating the beam with output signals for odd and even signals from the odd signal and even signal modulation means, respectively; The optical system has optical systems for odd and even signals that record odd and even signals by irradiating odd and even signal optical modulation signals onto desired positions on a disk master for odd and even signals, respectively. A disc manufacturing device featuring: