JP2837684B2 - Disk unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to an apparatus for reproducing and manufacturing a disk divided into an odd signal disk and an even signal disk. An odd signal disc recorded by modulating an odd signal sampled with an odd sampling signal and an even signal disc recorded by modulating and recording an even signal sampled with an even sampling signal generated alternately with the odd sampling signal. The present invention relates to a disc reproducing apparatus for separately reproducing signals and a disc manufacturing apparatus for manufacturing the odd-signal and even-signal discs.

(Prior Art) Compact discs (CDs) are characterized as digital audio discs, in which the dynamic range and distortion are significantly improved as compared to conventional records, have excellent sound quality, and are compact. It is widespread.

Compact discs can output signals on the left and right channels
20kHz in audible frequency band using 4.1kHz sampling frequency
It is possible to perform recording up to z and perform high-density recording for 60 minutes to 75 minutes on one side.

Compact discs use left and right two-channel signals to be recorded, for example, EFM (Eight to Fourteen Modulation).
Using modulation, 588 bits composed of data bits and channel bits as shown in FIG. 4 (b) are recorded as one frame. The bit rate in this case is about
1.93 Mb / s. Compact discs are thus 1
Since recording is performed in a signal format with 588 bits for a frame, signals on the left and right two channels can be recorded in a 20 kHz sound range.
You can only record up to.

By the way, it is generally said that human hearing does not respond to sounds above 20kHz, but even sounds above 20kHz are transmitted to the brain through the skin and ear bones near the ears, and music containing ultrasonic waves above 20kHz It is known that when listening to, alpha waves increase in brain waves.

(Problems to be Solved by the Invention) With a conventional compact disc, signals of two channels on the left and right can be recorded only up to a sound range of 20 kHz.
For example, as described above, there is a demand to further increase the treble frequency range to, for example, 40 kHz to increase the α-wave.

The present invention has been made in view of the above, and an object thereof is to divide a disk into an odd signal disk and an even signal disk, and to generate an odd sampling signal and an even sampling signal which alternately generate a signal to be recorded. An object of the present invention is to provide a reproducing apparatus and a manufacturing apparatus for a disk in which an odd-numbered signal obtained by sampling with a signal is recorded on an odd-numbered signal disk, and an even-numbered signal is recorded on an even-numbered signal disk to increase a high frequency range.

[Configuration of the invention]

(Means for Solving the Problems) According to a first aspect of the present invention, an odd-numbered signal disk in which an odd-numbered signal sampled with an odd-numbered sampling signal is modulated and recorded and an even-numbered sampling signal alternately generated with the odd-numbered sampling signal are sampled. A disk device for reading and reproducing signals separately from even-number signal disks recorded by modulating the even-number signal, and rotating means for rotating the odd-number signal and even-number signal disks in synchronization with each other, When reading the odd signal and the even signal respectively recorded on the odd signal and even signal disks rotating in synchronization with the rotating means, while reading the odd signal of the odd signal disk with an odd sample signal of a predetermined frequency, The even sample signal having the same frequency as the frequency of the odd sample signal is Odd signal and even signal reading means for simultaneously reading even signals of the even signal disk, and odd signal and even signal demodulating means for demodulating the odd signal and even signal respectively read by the odd signal and even signal reading means, The odd-numbered signal and the even-numbered signal demodulated by the odd-numbered signal and the even-numbered signal demodulating means are alternately arranged into a set of odd-numbered signals and a set of even-numbered signals. Arranging means, separating means for separating the output signals aligned by the odd and even signal aligning means into left and right channel signals, and amplifying means for amplifying and outputting the signals respectively separated by the separating means. Is the gist. According to a second aspect of the present invention, in a disk device that includes an odd-numbered signal disk and an even-numbered signal disk and records an odd-numbered signal and an even-numbered signal, a predetermined frequency for reading an odd-numbered signal portion of a frame composed of the odd-numbered signal and the even-numbered signal is provided. Means for alternately generating an odd-numbered sampling signal and an even-numbered sampling signal having the same frequency as the predetermined frequency for reading out the even-numbered signal portion of the frame, and a means for extracting the signal of the frame; Separation means for separating into even signals, odd signal and even signals separated by the separation means, respectively, and odd signal modulation means and even signal modulation means for digitally converting and EFM modulating respectively, and for odd signal and even signal Disk rotation means for odd and even signals for rotating disks while synchronizing, and for odd numbers Disks and laser for even disk separately provided, respectively,
Following the rotation of the odd signal and even signal disks, the laser light from each laser is optically modulated by the odd signal and even signal, respectively, to a desired position on the odd signal and even signal disks. And an optical system for odd-numbered signals and an optical system for even-numbered signals for recording odd-numbered signals and even-numbered signals, respectively.

(Operation) In the first invention, in a disk device including an odd signal disk and an even signal disk, the odd number recorded on the odd signal and even signal disks while rotating in synchronization with both disks. The signal and the even signal are read, respectively.

In this reading, the odd signal of the odd signal disk is read with an odd sample signal of a predetermined frequency,
In addition, the even-numbered signals on the disk for even-numbered signals are simultaneously read out using even-numbered sampled signals having the same frequency as the frequency of the odd-numbered sampled signals.

After demodulating the read odd-numbered signal and even-numbered signal, the odd-numbered signal group and the even-numbered signal group are alternately aligned, and the left and right channel signals are separated and reproduced from the aligned group.

In the disk device according to the second aspect of the present invention, since the frame composed of the odd signal and the even signal is read out by the odd and even sampling signals of the same frequency, respectively, the odd signal part and the even signal part have the same structure. Will have a double frequency band.

(Embodiment) Hereinafter, in describing an embodiment of the present invention with reference to the drawings, first, the principle of the present invention will be described with reference to FIGS. 3 to 5.

FIG. 3 (b) shows the waveform L of the left and right two-channel signals when the signals of the left channel L and the right channel R are sampled at a sampling frequency of 44.1 kHz and recording is performed up to an audio frequency band of 20 kHz in a conventional disc. , R and the sampling signals L1, L2,.
It is a figure which shows the relationship between * and R1, R2, .... As shown in the figure, the left channel signal L is sampled by 44.1 kHz sampling signals L1, L2,.
This indicates that sampling is performed 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 L and the right channel signal R are sampled at a sampling frequency of 88.2 kHz which is twice the conventional frequency, thereby obtaining a frequency of 40 kHz which is the conventional frequency. It is intended to enable recording and reproduction up to the high frequency band. That is,
In FIG. 3 (a), the left channel signal L is an odd sampling signal L10, L20, L3 for the left channel which is generated alternately.
0, ... and left channel even sampling signal L1
E, L2E, L3E,... Are alternately sequentially sampled, and the right channel signal R is similarly generated alternately, and the odd sampling signals R10, R20, R30,. Are sampled alternately and sequentially at R1E, R2E, R3E,. The left-channel odd-numbered sampling signals L10, L20, L30,... And the left-channel even-numbered sampling signals L1E, L2E, L3E,.
The sampling frequency for the left channel signal L is doubled to 88.2 kHz as compared with the conventional one, and similarly, the odd sampling signal R10, R20, R30,... for the right channel. . And even-numbered sampling signals R1E, R2E, R3E for the right channel,
Are each 44.1 kHz, but by sampling them alternately and sequentially, the sampling frequency for the left channel signal L becomes 88.2 kHz, twice that of the conventional one,
This allows the treble frequency band to be increased to 40 kHz.

As described above, the signal to be recorded is sampled by the odd-numbered sampling signal and the even-numbered sampling signal of 44.1 kHz, thereby forming the odd-numbered signal and the even-numbered signal, respectively, separating the odd-numbered signal and the even-numbered signal, and separating the odd-numbered signal. The recording is performed on the odd-numbered signal disk, and the even-numbered signal is separately recorded on the even-numbered signal disk. That is, the disk is divided into two disks, one for odd signals and the other for even signals.

FIG. 4 (b) shows a conventional frame configuration consisting of 588 bits for recording the signals of the right and left two channels to be recorded by EFM modulation as described above, and the information bits for the right channel include the above-mentioned right channel information bits. Sampling signals R1 to R6
Are set, and the left-channel information bits are set with the left-channel sampling signals L1 to L6.

On the other hand, FIGS. 4 (a-1) and 4 (a-2) show the frame structure in the case of the present invention. As can be seen from FIG. 4, they are divided into odd signal disks and even signal disks. The right channel odd bit sampling signals R10 to R60 are set in the right channel information bits of the odd signal disc, and the left channel odd sampling signals L10 to L60 are set in the left channel information bits. Also, the right channel information bits of the even signal disc are set with the right channel even sampling signals R1E to R6E, and the left channel even bits with the left channel even sampling signals L1E to L6E. .

As described above, the signal to be recorded is
When an odd signal disk and an even signal disk, each of which is divided into an odd signal and an even signal obtained by sampling with a 44.1 kHz sampling signal, are reproduced, the reproduced odd signal and even signal are reproduced. An audio signal having a high frequency range up to 40 kHz can be obtained by alternately performing alignment while synchronizing with a frame synchronization signal and performing D / A conversion.

That is, FIGS. 5 (a-1) and (a-2) show the odd signals L10 to L60 and R10 to R60 and the even signals L1 reproduced from the odd signal disk and the even signal disk, respectively.
E to L6E and R1E to R6E show audio data having a frequency band of 20 kHz in which left and right channels are arranged for each of the left and right channels. Both odd and even signals are shown in FIG.
As shown in 3), by alternately arranging odd numbers, even numbers, odd numbers, even numbers,..., Audio signal data having a high frequency band of 40 kHz can be obtained. FIG. 5 (b) shows the alignment of left and right channel signals in a conventional disk, in which case the frequency band is 20 kHz.

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 FIG. 1 uses two discs including an odd signal disc 1o and an even signal disc 1e on which odd and even signals are recorded, respectively, as described above. Disc playback control unit 3o for odd signals that reproduces odd signals recorded on disc 1o for odd signals, and even signals that reproduce even signals recorded on disc 1e for even signals Disc playback control unit 3e, an odd / even signal playback control unit 4 for alternately aligning and playing back both odd and even signals, and a common control of both the control units 3o, 3e and the odd / even signal playback control unit 4. And a common control unit 5 shown divided into two parts 5a and 5b. The signals recorded on the odd-numbered signal and even-numbered signal disks 1o and 1e are recorded, for example, by EFM modulation.

The odd-number signal disk reproduction control unit 3o and the even-number signal disk reproduction control unit 3e have the same configuration, and the disks 1o and 1e
7 and disks 1o, 1e for rotating the
The optical system 9 irradiates an incident light 9a to each of them, detects each reflected light 9b from the disks 1o, 1e, and optically reads out signals recorded on the disks 1o, 1e. Further, the motor 7 is controlled by the rotation control unit 11, the optical system 9 is controlled by the feed control unit 13 to move the disks 1 o and 1 e in the radial direction, and the trace control unit 15 controls the optical system 9.
Focusing and tracking control for o, 1e are performed. Also, a disc read by the optical system 9
The modulated signals from 1o and 1e are supplied to the RF amplifier / PLL circuit unit 17 and amplified, and after the clock is reproduced,
The signal is supplied to the demodulation circuit 19. Demodulation circuit 19 is disk 1
For example, the signal read from O and 1e, for example, as EFM-modulated, is demodulated and converted into data bits, and supplied to the data control / interpolation circuit 21. The data control / interpolation circuit section 21 performs error data detection / correction interpolation processing on the data demodulated by the demodulation circuit 19 together with the error correction section 23, and supplies the data to the odd / even signal reproduction control section 4. The signal subjected to the error detection / correction interpolation processing in the data control / interpolation circuit unit 21 is supplied to the odd / even signal selection circuit 35 of the odd / even signal reproduction control unit 4, where the odd signal, the even signal, the odd signal and the even signal are output. Are 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 reproduction control unit 3o for odd signals, and the even signals are supplied to the alignment circuit 45 of the disk reproduction control unit 3e for even signals, The odd-numbered signal and the even-numbered signal are stored in the odd / even signal alignment circuit 37 of the odd / even signal reproduction controller 4.
, And each signal is aligned by each alignment circuit as shown in FIG. 5 described above.

The signals aligned by the respective alignment circuits are respectively applied to the respective parts, that is, the corresponding LR separation circuits 47 of the odd-number signal disk reproduction control unit 3o, the even-number signal disk reproduction control unit 3e, and the odd-even signal reproduction control unit 4. The separated left and right channel signals are separated into a left channel signal and a right channel signal.
The signal is converted into an analog signal by the 5L and RD / A converter 25R, further amplified and output by the L audio amplifier 27L and the R audio amplifier 27R, and output from a speaker (not shown) or the like.

More specifically, the odd signals selected by the odd / even selection circuit 35 are aligned by the alignment circuit 45 of the odd signal disc reproduction control unit 3o, and further separated by the LR separation circuit 47. As shown in a-1), the signals are aligned and separated, converted into analog signals by the L / D / A converter 25L and the R / D / A converter 25R, amplified by the L audio amplifier 27L and the R audio amplifier 27R, and output. Is done.

The even-numbered signal selected by the odd-even selection circuit 35 is aligned by the alignment circuit 45 of the disk reproduction control unit 3e for even-numbered signals.
-Separated by an R separation circuit 47, aligned and separated as shown in FIG.
The signal is converted into an analog signal by the D / A converter 25R, amplified by the L audio amplifier 27L and the R audio amplifier 27R, and output.

The odd-numbered signal and the even-numbered signal selected by the odd / even selection circuit 35 are combined with the odd / even signal alignment circuit 37 of the odd / even signal reproduction control unit 4.
, And further separated by the LR separation circuit 47.
As shown in the figure (a-3), they are aligned and separated, converted into analog signals by the L / D / A converter 25L and the R / D / A converter 25R, and amplified by the L audio amplifier 27L and the R audio amplifier 27R. Output.

The common control unit 5 (5a, 5b) has a microcomputer 29, a memory 31, and an operation display unit 33. The microcomputer 29 and the memory 31 detect errors in demodulated data via the data control / interpolation circuit unit 21. Correction interpolation processing, rotation control of the motor 7 via the rotation control unit 11, and other various controls are performed. The operation display section 33 has operation buttons, display lamps, and the like, performs various operation controls via the microcomputer 29, and displays a state or the like generated by the various controls. Also, the motor 7 of the odd-number signal disk reproduction control unit 3o and the motor 7 of the even-number signal disk reproduction control unit 3e rotate in synchronism with each other under the control of the microcomputer 29 via the rotation control unit 11. Signal disk 1o and even signal disk 1e
Are read out in synchronization with each other.

As described above, the disk reproducing apparatus configured as described above includes the odd-numbered signal disk 1o and the even-numbered signal disk 1e that record only the odd-numbered signal and the even-numbered signal, respectively.
Under the control of each rotation control unit 11 via each motor 7 of the odd-number signal disk reproduction control unit 3o and the even-number signal disk reproduction control unit 3e. Each incident light 9a from each optical system 9 is irradiated onto a desired position on each of the disks 1o and 1e while performing focusing and tracking control by the trace control unit 15, and each reflected light 9b from each of the disks 1o and 1e is optically irradiated. The system 9 detects and reads, and reads the read disks 1o, 1
After amplifying and clock-reproducing each signal from e through each RF amplifier / PLL circuit section 17, each signal is demodulated by each demodulation circuit 19, and further error is corrected by each data control / interpolation circuit section 21 and each error correction section 23. The data is subjected to detection / correction interpolation processing and supplied to the odd / even selection circuit 35. The odd / even selection circuit 35 classifies and selects the odd signal, the even signal, the odd signal and the even signal as described above, and supplies the odd signal to the alignment circuit 45 of the odd signal disc reproduction control unit 3o. The signal is supplied to the alignment circuit 45 of the even-number signal disk reproduction control unit 3e, and the odd-number signal and the even-number signal are further supplied to the odd-even signal alignment circuit 37 of the odd-even signal reproduction control unit 4.

The aligning circuit 45 of the odd-number signal disk reproduction control unit 3o aligns the odd-numbered signals supplied through the odd-even selecting circuit 35, further separates them into left and right channel signals by an LR separating circuit 47, and then separates the left and right channel signals. The left and right channel signals are converted to left and right channel analog signals by an L-D / A converter 25L and an R-D / A converter 25R, respectively.
The signal is amplified by the amplifier 27R and output as left and right channel signals from a speaker (not shown) or the like.

On the other hand, the alignment circuit 45 of the disk reproduction control unit 3e for even-number signals
Aligns the even signals supplied via the odd / even selection circuit 35, further separates the left and right channel signals by an LR separation circuit 47, and then separates the left and right channel signals into L / D / A converters, respectively. 25L and R-D / A converter 25R convert to left and right channel analog signals, and amplify by L audio amplifier 27L and R audio amplifier 27R, respectively, and output them as left and right channel signals from speakers (not shown). I do.

As described above, the odd-numbered signal and the even-numbered signal which are reproduced and amplified by the odd-numbered-signal disc reproduction control unit 3o and the even-numbered-signal disc reproduction control unit 3e are respectively
A signal sampled and recorded with a 44.1 kHz sampling signal is reproduced and amplified.Each signal itself has a frequency band of 20 kHz, and both signals can be reproduced by a normal CD player. By synchronizing and reproducing both, it is reproduced as an excellent audio sound in the high frequency range up to 40 kHz.

In the odd / even signal reproduction control section 4, the odd and even signals selected by the odd / even selection circuit 35 are alternately aligned by the odd / even signal alignment circuit 37, and then the LR separation circuit 39 and the left and right channel signals are arranged. The left and right channel signals are then converted to left and right channel analog signals by an L-D / A converter 25L and an R-D / A converter 25R, respectively, and the L audio amplifier 27L and the R audio amplifier, respectively. The signal is amplified by the 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 4
Since both odd and even signals sampled with a 4.1 kHz sampling signal are alternately aligned,
It is the same as that sampled with an 88.2 kHz sampling signal, and is reproduced as an excellent audio sound having a high range up to 40 kHz, which is about twice that of the conventional one.

FIG. 2 is a block diagram showing a configuration of a disk manufacturing apparatus according to another embodiment of the present invention. The disk manufacturing apparatus shown in the figure divides a signal to be recorded into an odd signal and an even signal as described above, records one odd signal on the odd signal disk master 200o, and converts the other even signal into an even signal. The odd-signal disc recording control unit 203o that records an odd signal on the odd-signal disc master 200o, and the even-signal disc recording that records the even signal on the even-signal disc master 200e. Control unit 203e
And a common control unit 205 that controls both the control units 203o and 203e in common.
It is composed of

The common control unit 205 is supplied with an audio input signal including a frequency higher than, for example, 40 kHz to be recorded on the odd-numbered signal and even-numbered signal disc masters 200o, 200e. And then, in the sample-and-hold circuit 303, at a sampling frequency of 88.2 kHz, for example, FIG.
The sample is supplied to the odd / even signal separation circuit 305 as shown in FIG. The signal sampled at a sampling frequency of 88.2 kHz in the separation circuit 305 is alternately used as an odd signal and an even signal, that is, L10, L20,.
.. / R10, R20,... And L1E, L2E,... / R1E, R2E,. The odd and even signals thus separated are respectively
It has a sampling frequency of 44.1 kHz, the odd signal is supplied to the A / D converter 51 of the odd signal disc recording control unit 203o, and the even signal is supplied to the A / D converter 50 of the even signal disc recording control unit 203e. Supplied.

The odd-number signal disk recording control unit 203o and the even-number signal disk recording control unit 203e have the same configuration, and have motors 73 for rotating the disk masters 200o and 200e, respectively. It is driven to rotate synchronously by the control unit 99. In addition, each disc master 200
o and 200e are each configured to record a signal via an optical system 63, and this optical system 63 is controlled by a trace control unit 89 while focusing and tracking is controlled by a radial feed servo control unit 87. The movement of the radial positions of the master discs 200o and 200e is controlled by the motor 85.

Further, as described above, the odd signal and the even signal supplied from the odd / even signal separation circuit 305 of the common control unit 205 to the respective A / D converters 51 of the odd signal and even signal disk recording control units 203o and 203e are: The signals are converted into digital signals, subjected to error detection / correction interpolation processing in each data control / interpolation circuit unit 53 from each A / D converter 51, and EFM-modulated in each modulation circuit 55, for example. The odd signal and the even signal modulated by each modulation circuit 55 are supplied to the optical modulator 59 and the trace control unit 89 via each PLL circuit 57. 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 converts each optically modulated signal from the beam splitter 61 to the optical system 63. Irradiate onto the master discs 200o and 200e via the concave lens 67 and the recording lens 69, respectively, and record the odd and even signals modulated on the master discs 200o and 200e, respectively. In this case, the focus control of the laser beam irradiated onto the master discs 200o and 200e is performed by the focus servo control unit 65 of the optical system 63, and the radial feed motor
A radial feed servo control unit 87 and a trace control unit 89 through 85 control the radial position and tracking of the master discs 200o and 200e. The focus servo control unit 65 includes a He-Ne laser 75, a beam splitter 77 for shunting the laser beam from the He-Ne laser 75, and a beam splitter 77.
One of the laser beams shunted at 77 is used as a recording lens 69
Lens 79 that irradiates the master discs 200o and 200e through the
And a reflection mirror 71, a photodetector 81 that detects light of the other laser beam from the beam splitter 77, and a lens control system 83 that controls the recording lens 69 in response to an output signal of the photodetector 81. It is configured.

The common control unit 45 has a microcomputer 91, a memory 93, an operation display unit 95, and an argon laser 97, in addition to the above-described configuration, and the microcomputer 91 and the memory 93 are motors for the odd-number signal disk master 200o. 73
In addition, various controls such as synchronous rotation control of the motor 73 for the even-number signal disk master 200e, error detection / correction interpolation processing via the data control / interpolation circuit unit 53, and overall control operations are performed. The operation display unit 95 has operation buttons, display lamps, and the like, performs various operation controls via the microcomputer 91, and displays a state or the like generated by the various controls.

In the disk manufacturing apparatus configured as described above, the odd-numbered signal and even-numbered signal disc masters 200o, 200
While rotating e through each motor 73 under the control of each rotation control unit 99, the audio input signal to be recorded is supplied from the low-pass filter 301 to the sample hold circuit 303, and sampled at a sampling frequency of 88.2 kHz. The odd / even signal separation circuit 305
Separates into odd and even signals. Then, of the separated signals, the odd signal is supplied to the A / D converter 51 of the odd signal disk recording control unit 203o, and the even signal is supplied to the A / D converter 51 of the even signal disk recording control unit 203e. Convert to digital signal. The odd-numbered signal and the even-numbered signal converted into digital signals are passed through the respective data control / interpolation circuits 53 of the odd-numbered signal disk recording control unit 203o and the even-numbered signal disk recording control unit 203e. EFM modulation and conversion to channel bits are supplied to each optical modulator 59 via each PLL circuit 57, and each optical modulator 59 uses an argon laser according to each modulation signal.
The laser beam from 97 is optically modulated, and the modulated laser beam is irradiated onto odd-signal and even-signal disk masters 200o and 200e via a beam splitter 61 and an optical system 63, thereby providing an odd-signal and Odd-numbered signals and even-numbered signals are recorded on the even-numbered signal disks 200o and 200e, respectively. In this recording operation, the radial feed motors 85 control the positions of the master disks 200o and 200e in the radial direction and the tracking control, and the focus servo control unit 65 controls the focusing.

As described above, after being sampled at a sampling frequency of 88.2 kHz, the odd signal and even signal discs that record each signal separated into an odd signal and an even signal,
Since the odd and even signals recorded respectively have a sampling frequency of 44.1 kHz, if both discs are reproduced simultaneously, the frequency band will be about 40 times the frequency band of the conventional one.

In the above embodiment, two signals for the odd signal and the even signal are used.
Although one disk is used, the same applies to the case where odd and even signals are recorded on the front and back of one disk, respectively, and the operation is performed on one disk.

〔The invention's effect〕

As described above, according to the first aspect, in the disk device including the odd-numbered signal disk and the even-numbered signal disk, recording is performed on the odd-numbered signal disk and the even-numbered signal disk while rotating in synchronization with both disks. The odd and even signals are read out.

In this reading, the odd signal of the odd signal disk is read with an odd sample signal of a predetermined frequency,
In addition, the even-numbered signals on the disk for even-numbered signals are simultaneously read out using even-numbered sampled signals having the same frequency as the frequency of the odd-numbered sampled signals.

After demodulating the read odd-numbered signal and even-numbered signal, the odd-numbered signal group and the even-numbered signal group are alternately aligned, and the left and right channel signals are separated and reproduced from the aligned group.

For this reason, even if the odd and even sampling signals have the same frequency, the odd and even signals are alternately sampled at the same sampling frequency, so that sampling is performed at twice the frequency, and Since the odd-numbered signal sets and the even-numbered signal sets obtained by sampling are alternately arranged, for example, the frequency band of 20 KHZ with 588 bits per frame in the related art, but in the present invention, it is approximately doubled. It is possible to obtain a frequency band of 40KHZ.

Therefore, since it can be reproduced by a normal player, there is no need to use a dedicated reproducing device.

In the disk device according to the second aspect of the present invention, since the frame composed of the odd signal and the even signal is read out by the odd and even sampling signals of the same frequency, respectively, the odd signal part and the even signal part have the same structure. Has a double frequency band. For example, when the sampling frequency is 44, 1 KHZ, it is 88, 2 KHZ, and both the odd signal and the even signal are 44, 1 KHZ.

Since the odd and even signals are stored in the odd and even signal disks by the odd and even signal optical systems, the signals have twice the frequency band.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a disk reproducing apparatus according to one embodiment of the present invention, FIG. 2 is a block diagram showing a configuration of a disk manufacturing apparatus according to another embodiment of the present invention,
FIG. 3 is a diagram showing a waveform of a signal to be recorded and its sampling signal, FIG. 4 is a diagram showing a signal format recorded on a disk, and FIG. 5 is a diagram showing signal data arranged for each of left and right channels. . 1o: Odd signal disk, 1e: Even signal disk, 3o: Odd signal disk reproduction control unit, 3e ... Even signal disk reproduction control unit 3, 4, ... Odd / even signal reproduction control unit, 35 ... … Odd / even selection circuit, 37… odd / even signal alignment circuit, 45… alignment circuit, 47… LR separation circuit, 200 o… odd disk master disk, 200 e… even disk master disk, 203 o… odd number Signal disk recording control unit 203e ... Even number signal disk recording control unit 205 ... Common control unit 303 ... Sample hold circuit 305 ... Odd / even signal separation circuit

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-64-89077 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) G11B 20/10

Claims (2)

(57) [Claims] 1. An odd-number signal disk on which an odd-numbered signal sampled with an odd-numbered sampling signal is modulated and recorded, and an even-numbered signal obtained by modulating and recording an even-numbered signal sampled with an even-numbered sampling signal generated alternately with the odd-numbered sampling signal What is claimed is: 1. A disk device for separately reading and reproducing signals from a signal disk, comprising: a rotating unit configured to rotate the odd-numbered signal disk and the even-numbered disk while synchronizing with each other; and an odd number rotating in synchronization with the rotating unit. When reading the odd signal and the even signal recorded on the signal and even signal disks, respectively, the odd signal of the odd signal disk is read with an odd sample signal of a predetermined frequency, and the same frequency as the frequency of the odd sample signal. The even sample signal of the even signal disc Signal and odd signal reading means for simultaneously reading signals, odd and even signal demodulating means for demodulating the odd and even signals respectively read by the odd and even signal reading means, and the odd and even signals. Odd- and even-numbered signals demodulated by the signal demodulation means are alternately arranged into a set of odd-numbered signals and a set of even-numbered signals, and an odd-even signal aligning means for sending out this aligned set as an output signal; A separating unit for separating left and right channels from the output signals aligned by the odd and even signal aligning unit; and an amplifying unit for amplifying and outputting the signals separated by the separating unit, respectively. Disk device. 2. A disk device comprising an odd signal disk and an even signal disk for recording an odd signal and an even signal, wherein a disk of a predetermined frequency for reading an odd signal portion of a frame composed of the odd signal and the even signal is provided. Means for alternately generating an odd-numbered sampling signal and an even-numbered sampling signal having the same frequency as the predetermined frequency for reading out the even-numbered signal portion of the frame, and a means for extracting the signal of the frame; A separating unit that separates the odd signal and the even signal separated by the separating unit into digital signals, respectively, and an odd signal modulating unit and an even signal modulating unit that respectively perform EFM modulation and the odd signal and the even signal; Disk rotating means for odd and even signals for rotating signal disks in synchronization And a laser for the odd-numbered disk and the even-numbered disk, respectively, and following the rotation of the odd-numbered signal and the even-numbered disk, the laser light from each laser is converted to the odd-numbered signal and the even-numbered disk. A disk having an optical system for odd-numbered signals and an even-numbered signal for optically modulating with a signal and irradiating a desired position on the disks for odd-numbered signals and even-numbered signals to record odd-numbered signals and even-numbered signals, respectively; apparatus.