JP2801632B2 - Disk unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a reproducing apparatus and a manufacturing apparatus for an optical disc divided into a left channel disc and a right channel disc. A disc reproducing apparatus and a disc reproducing apparatus for recording and reproducing a left channel signal on a left channel disc and a right channel signal on a right channel disc, thereby reproducing and producing the left and right channel discs respectively. About.

(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 are used to process left and right 2 channel signals.
20k in the audible frequency band using a sampling frequency of 44kHz
Hz, and high-density recording can be performed for 60 minutes to 75 minutes on one side.

The compact disc is used to record left and right two-channel signals to be recorded, for example, EFM (Eight to Fourteen Modulatio).
n) data bits as shown in FIG.
588 bits having a channel bit configuration are recorded as one frame. The bit rate in this case is about 1.93
6 Mb / s. Since the compact disc is recorded in the signal format having 588 bits per frame as described above, signals of the left and right two channels can be recorded only in the sound range up to 20 kHz.

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

(Problems to be Solved by the Invention) With a conventional compact disc, signals of two channels on the left and right can only be recorded up to a sound range of 20 kHz.
For example, as described above, there is a demand to further increase the high-temperature 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 disc into a left channel disc and a right channel disc, record a left channel signal on the left channel disc, The present invention provides a disk reproducing apparatus and a disk reproducing apparatus for reproducing and manufacturing a left channel and a right channel disk in which a right channel signal is recorded and a high sound frequency range is increased.

[Structure of the Invention] (Means for Solving the Problems) In a first invention, an information section and an error code section are defined as one frame in data having a predetermined number of bits, and the one frame is EFM.
A disc device for reading and reproducing signals from the left and right channel discs separately from the left and right channel discs by converting the signals recorded on the corresponding channel discs into the left and right channel signals by modulation. Left and right disk rotating means for rotating the left and right channel disks, respectively, synchronizing means for synchronizing the left and right disk rotating means, and recording on the left channel and right channel disks rotating while being synchronized by the synchronizing means. Left and right channel readout means for reading out the left and right channel signals obtained in units of one frame, respectively, and EFM demodulation of the left and right channel signals read out by the left and right channel readout means, respectively, to obtain a double frequency signal. Left to get the traffic light A right channel signal demodulating means and to the gist that a left and right channel signal amplifying means for outputting left and right channel signals to the left and right channel signals demodulated by the demodulating means and amplified respectively.

According to a second aspect of the present invention, a left channel signal is recorded on a left channel disc master and a right channel signal is recorded on a right channel disc master, thereby producing data on the left channel disc and the right channel disc, respectively. An input signal converting means for digitally converting each of an information part and an error code part into one frame after removing a signal having a frequency equal to or higher than a combined frequency of a left channel signal and a right channel signal to be recorded; and Left and right channel modulating means for performing EFM modulation by interpolating left and right channel data from input signal converting means, and optically controlling left and right channel data from left and right channel modulating means, respectively. For the left channel master and the right channel And left and right master disc rotating means for rotating while respectively synchronizing the disk master,
A laser beam for recording left and right channel data from the left and right channel modulating means is output to the left and right channel disc masters rotating in synchronization with the left and right disc rotating means, and the track is output. And means for generating data.

(Operation) In the first invention, the disc is divided into a left channel disc and a right channel disc, and the left and right channels recorded on the left and right channel discs are rotated while rotating both discs synchronously. The signal is read out as an information part and an error code part as one frame, respectively, EFM-modulated, demodulated, amplified and output.

In the second invention, data of a predetermined number of bits is composed of one frame, an information part and an error code part, divided into a left-channel disk master and a right-channel disk master, and rotated in synchronization with both disk masters. While the left and right channel signals to be recorded on the left and right disc masters are EFM modulated,
The laser beam is optically modulated by the modulation signals of the left and right channels, and is irradiated to a desired position on the left and right disc masters via the left and right channel optical system for recording.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a disk reproducing apparatus according to one embodiment of the present invention. The disc reproducing apparatus shown in FIG. 1 includes a left-channel disc (hereinafter simply referred to as a “left disc”) 1L on which a left-channel signal is recorded out of two left and right channels and a right-channel disc (hereinafter, simply referred to as a “left disc”). The two discs, 1R and 1R, are used to play both left and right discs separately, and the left channel signal recorded on the left disc 1L is played. Disc playback control unit 3L to play the right channel signal recorded on the right disc 1R
3R and a common control unit 5 for commonly controlling the two control units 3L and 3R. The signals recorded on the left and right disks 1L and 1R are recorded by, for example, EFM modulation.

The left disk reproduction control unit 3L and the right disk reproduction control unit 3R have the same structure, and irradiate the motor 7 for rotating and driving the disks 1L and 1R, respectively, and the disks 1L and 1R with the incident light 9a, respectively. And an optical system 9 that detects each reflected light 9b from the optical disk and optically reads out signals recorded on the disks 1L and 1R. 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 1L and 1R in the radial direction, and the tracing control unit 15 focuses and tracks the disks 1L and 1R. Control is being performed. The modulated signals from the disks 1L and 1R read by the optical system 9 are supplied to the RF amplifier / PLL circuit section 17 where they are amplified and, at the same time, the clock is reproduced, and then supplied to the demodulation circuit 19. The demodulation circuit 19 demodulates, for example, an EFM-modulated signal read from the disks 1L and 1R, converts the signal into data bits, and supplies the data bit to the data control / interpolation circuit 21. The data control / interpolation circuit unit 21 performs error data detection / correction interpolation processing on the data demodulated by the demodulation circuit 19 together with the error correction unit 23, and supplies the data to the D / A converter 25. The signal subjected to the error detection / correction interpolation processing in the data control / interpolation circuit unit 21 is converted into an analog signal by the D / A converter 25, amplified by the audio amplifier 27, and output.
It is output from a speaker or the like (not shown).

The common control unit 5 includes a microcomputer 29, a memory 31, and an operation display unit 33.
The memory 29 and the memory 31 perform error detection / correction / interpolation processing of demodulated data via the data control / interpolation circuit section 21, further control the rotation of the motor 7 via the rotation control section 11, and various other controls. 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. Further, the motor 7 of the left disk reproduction control unit 3L and the motor 7 of the right disk reproduction control unit 3R rotate in synchronization with each other under the control of the microcomputer 29 via the rotation control unit 11, whereby the left disk 1L and the right disk The signals read from the disk 1R are also read in synchronization with each other.

The left and right discs 1L and 1R used in the disc reproducing apparatus configured as described above record the signals of the left and right channels separately. In this case, as shown in FIG. 1L or 1R only needs to record the left or right channel signal, respectively, and it is not necessary to record both left and right channel signals on a single disk as in the past, so the signal recording format for EFM modulation is 4, 306 bits, which is almost half, as shown in FIG. 2, may be used for one frame of 588 bits of the conventional signal format shown in FIG. Therefore, signals in a high sound frequency range up to 40 kHz, which is about twice that of the conventional 20 kHz, can be recorded on the left and right disks 1L and 1R.
Note that the bit rate in this case is about 1.997 Mb / s.

The disc reproducing apparatus of FIG. 1 configured as described above is configured to convert the left disc 1L and the right disc 1R, on which the signals of the left and right channels are recorded, respectively, into the left disc reproduction control unit 3L and the right disc reproduction Control unit
Under the control of the respective rotation controllers 11, the motors are rotated in synchronization with each other via both the motors 3R, and under the control of the respective feed controllers 13, each of the left and right channels is moved to a desired position on the disk 1L, 1R. Each of the incident lights 9a from the optical system 9 is irradiated while performing focusing and tracking control by the trace control unit 15, and each of the reflected lights 9b from the disks 1L and 1R is detected and read by each optical system 9, and the read disk is read. 1L, 1
After each signal from R is amplified and clock recovered through each RF amplifier / PLL circuit section 17, it is demodulated by each demodulation circuit 19, and further error-corrected by each data control / interpolation circuit section 21 and each error correction section 23. Performs data detection / correction interpolation processing, and then converts them into left and right channel analog signals with each D / A converter 25, and amplifies them with an audio amplifier 27.
If not shown, left and right channel signals are output from a speaker or the like.

FIG. 3 is a block diagram showing a configuration of a disk manufacturing apparatus according to another embodiment of the present invention. The disc manufacturing apparatus shown in the figure records the left channel signal of the left and right two channels on a left channel disc master (hereinafter simply referred to as “right disc master”) 41L, and records the right channel signal on the right channel disc. The left disc is to be recorded on another disc master 41L, 41R for each channel, such as to be recorded on the master (hereinafter simply referred to as "right disc master") 41R, and the left channel signal is recorded on the left disc master 41L. A recording control unit 43L, a right disc recording control unit 43R that records a right channel signal on the right disc master 41R,
A common control unit 45 controls both the control units 43L and 43R in common.

Left disc recording control unit 43L and right disc recording control unit 43R
Have the same configuration, and have motors 73 for rotating the disk masters 41L and 41R, respectively, and the motors 73 are rotationally driven by the rotation control unit 99 in synchronization with each other.
Each of the master discs 41L and 41R is configured to record a signal via an optical system 63.
Numeral 63 denotes a radial feed servo controller 87 while focusing and tracking are controlled by a trace controller 89.
Disc master 41 by radial feed motor 85 via
The movement of the positions of L and 41R in the radial direction is controlled.

The left and right channel audio input signals to be recorded on the master discs 41L and 41R are supplied to the low-pass filters 47 of the left disc recording control unit 43L and the right disc recording control unit 43R, respectively.
The signal of 40 kHz or more is cut off by the sample and hold circuit 49 and supplied to each sample and hold circuit 49.
It is supplied to the D converter 51 and converted into a digital signal. The digital signals for the left and right channels from each A / D converter 51 are subjected to error detection / correction interpolation processing in each data control / interpolation circuit unit 53, and, for example, EFM signals are output in each modulation circuit 55.
Modulated. The left and right channel signals modulated by the respective modulation circuits 55 are respectively transmitted to the optical modulators 59 via the respective PLL circuits 57.
And supplied to the trace control unit 89. 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 this optically modulated optical signal from the beam splitter 61 to the optical system 63. Irradiate the master discs 41L and 41R via the concave lens 67 and the recording lens 69, respectively.
The left and right channel modulation signals are recorded on L and 41R, respectively. Then, in this case, the focus control of the laser beam irradiated onto the disk masters 41L and 41R is performed by the focus servo control unit 65 of the optical system 63, and the radial feed servo control unit 87 and the The trace control unit 89 controls the radial position and tracking of the disk masters 41L and 41R. Note that the focus servo control unit 65 includes a He-Ne laser 75 and the He-Ne laser.
A beam splitter 77 for shunting the laser beam from the Ne laser 75, a concave lens 79 and a reflection mirror for irradiating one of the laser beams shunted by the beam splitter 77 to the master discs 41L and 41R via the recording lens 69 71
A light detector 81 for detecting the other laser beam from the beam splitter 77, and a lens control system 83 for controlling the recording lens 69 in response to an output signal of the light detector 81. I have.

The common control unit 45 has a microcomputer 91, a memory 93, an operation display unit 95, and an argon laser 97,
The microcomputer 91 and the memory 93 are a motor 73 for the left master disk 41L and a motor for the right master disk 41R.
Various controls such as synchronous rotation control of 73, 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.

The left and right master discs 41L and 41R used for recording in the disc manufacturing apparatus configured as described above are used for the left or right channel in the reproducing apparatus of FIG. 1 as described with reference to FIG. It is only necessary to record only the signals, and it is not necessary to record the signals of both the left and right channels on one disc as in the conventional case. Therefore, the signal recording format in the case of the EFM modulation is the same as the conventional one shown in FIG. As shown in FIG. 2, there are 306 bits, which is almost half, for 588 bits of one frame of the signal format. Therefore, compared to the conventional 20 kHz,
It is possible to record a signal in a high treble frequency range up to about 40 kHz, which is about twice as high.

In the disk manufacturing apparatus of FIG. 3 configured as described above, the disk masters for the left and right channels are used.
The left and right channel signals to be recorded on the respective master discs 41L and 41R are respectively transmitted to the left disc recording control section 43L and the right disc while the 41L and 41R are synchronously rotated via the respective motors 73 under the control of the respective rotation control sections 99. Recording control unit 43R
Of each sample and hold circuit 49, each A / D converter 51, and each data control
After passing through the interpolation circuit unit 53, EFM modulation is performed in each modulation circuit 55 and converted into channel bits, and is supplied to each optical modulator 59 through each PLL circuit 57. The laser beam from the argon laser 97 is light-modulated, and this light-modulated laser beam is irradiated onto the left and right disk masters 41L and 41R via the beam splitter 61 and the optical system 63, whereby the left and right disks 41L and 41R are irradiated. The left and right channel signals are respectively recorded in the. In this recording operation, the radial feed motor 85 controls the radial position and tracking of each of the disk masters 41L and 41R, and also controls the focus / servo control unit.
Focusing control is performed by 65.

In each of the above embodiments, the case of EFM modulation has been described as a modulation method. However, the present invention is not limited to this, and another modulation method may be used. Furthermore, although the description has been given of the case of the optical system as the reproducing system, the present invention can be similarly applied to a capacitance system and a piezoelectric system.

[Effects of the Invention] As described above, according to the first invention, the disk is divided into a left channel disk and a right channel disk.
While rotating both disks in synchronization, the left and right channel signals recorded on the left and right channel disks are read out as an information part and an error code part as one frame, respectively, and these are EFM modulated and demodulated respectively. Amplify and output.

For this reason, the effect is obtained that the data stored per frame is half of the conventional one and the output signal can obtain a signal of twice the frequency band. For example, in the related art, 588 bits per frame is 20 KHZ, but in the present invention, about 306 bits, which is about half, is doubled to 40 KHZ.
HZ can be obtained.

Further, according to the second aspect of the present invention, with the above configuration, data of a predetermined number of bits is composed of one frame, an information part and an error code part, and is divided into a left-channel disk master and a right-channel disk master. If the left and right channels are recorded on the left and right disc masters while rotating synchronously, the left and right channel signals are EFM modulated, the laser beam is optically modulated with the left and right channel modulation signals, and the desired Irradiate at position and record.

For this reason, the data stored in the left-channel disc master and the right-channel disc master has half the number of bits per frame (information section and error code section) per frame, and as a result, the frequency band and signal are doubled. The effect of being able to record is obtained.

For example, a signal of 40 KHZ, which is twice as large as 306 bits, can be recorded.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a disk reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a diagram showing signal formats recorded on left and right disks reproduced by the reproducing apparatus of FIG. FIG. 3 is a block diagram showing a configuration of a disk manufacturing apparatus according to another embodiment of the present invention, and FIG. 4 is a diagram showing a signal format recorded on a conventional disk. 1L… Left disk 1R… Right disk 3L… Left disk playback controller 3R… Right disk playback controller 5,45… Common controller 41L… Right disk master 41R… Left disk master 43L… Left Disc recording control unit 43R …… Right disc recording control unit

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 20/10 321

Claims (2)

(57) [Claims] 1. An information part and an error code part in data of a predetermined number of bits are made into one frame, and the one frame is converted into left channel and right channel signals by EFM modulation, and recorded on a corresponding channel disk. A left and right disc rotating means for rotating the left and right channel discs, respectively, wherein the disc signals read and reproduce the signals respectively from the left and right channel discs. A synchronizing unit for synchronizing the left and right disk rotating units; and a left and right reading unit for reading the left and right channel signals recorded on the left and right channel disks rotating in synchronization with the synchronizing unit, respectively, in the one frame unit. And right channel reading means; Left and right channel signal demodulation means for obtaining a signal of double frequency by EFM demodulating the left and right channel signals respectively read by the right and left channel reading means, and demodulated by the left and right channel signal demodulation means. A disk device comprising: left and right channel signal amplifying means for amplifying and outputting left and right channel signals, respectively. 2. A disk apparatus for recording data on a left channel disk and a right channel disk by recording a left channel signal on a left channel disk master and recording a right channel signal on a right channel disk master, respectively. Input signal converting means for digitally converting each of the information section and the error code section into one frame after removing a signal having a frequency equal to or higher than the combined frequency of the left channel signal and the right channel signal to be recorded; and A left and right channel modulator for performing EFM modulation by interpolating left and right channel data from the input signal converter, respectively, and optically converting left and right channel data from the left and right channel modulator, respectively. While controlling the disc master for the left channel and the right Left and right disc master rotating means for rotating the channel master disc in synchronization with each other; and left and right channel modulation on the left and right channel disc masters rotating in synchronization with the left and right disc rotating means. Means for outputting a laser beam for recording left and right channel data from the means to generate data on a track.