JPH11353653A - Optical disk production system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce an optical disk recorded with the sound data faithful to original tones. SOLUTION: This production system consists in forming the sound data of the digital waveforms faithful to the original tones by removing the components, exclusive of codes, such as ripple components and jitter components, superposed on the sound data of the original tones in a master disk production apparatus 1 by an interface section 5 and recording the data on a master disk 7. Next, the components, exclusive of codes, such as ripple components and jitter components, superposed on the sound data reproduced from the master disk 7 are removed by an interface section 9 in a CD cutting system 2, by which the sound data of the digital waveforms faithful to the original tones recorded on the master disk 7 is formed and is recorded on a mother stamper. The optical disk is produced in accordance with the mother stamper. As a result, the production of the optical disk recorded with the sound data faithful to the original tones is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk manufacturing system for manufacturing an optical disk such as a compact disk or a digital video disk.
The present invention relates to an optical disk manufacturing system capable of manufacturing an optical disk on which digital waveform data faithful to the original sound or image is recorded.

[0002]

2. Description of the Related Art Conventionally, a direct cutting method has been known as a recording method capable of faithfully reproducing an original sound. In the direct cutting method, for example, a performance of a player or the like is directly recorded on a recording medium on the spot as an analog signal or digital data. According to this direct cutting method, since the original sound can be directly recorded on the recording medium, the original sound can be faithfully recorded on the recording medium with little noise or sound quality deterioration, and can be reproduced. it can.

[0003] However, in order to perform recording by the direct cutting method, a player goes to a place where a recording apparatus for performing direct cutting is mounted and plays, or a recording apparatus for performing direct cutting to a place where the player performs is used. You need to bring it. Also, if a mistake occurs during a performance, it is not possible to perform editing processing such as replaying the performance etc. from the place where the mistake was performed and re-recording, so it is necessary to re-record the performance etc. from the beginning. , Very cumbersome and inconvenient.

For this reason, this direct cutting method is currently positioned as an ideal recording method. In actuality, the original sound is temporarily recorded on a recording medium (primary recording medium: master tape, etc.). However, an indirect recording method is employed in which audio information reproduced from the primary recording medium is recorded on a secondary recording medium (secondary recording medium: mother stamper of a compact disk, etc.).

[0005] A description will now be given of a process generally performed until a mother stamper of a compact disc is formed by this indirect recording method. This process is to convert the original sound shown in FIG. A production process for recording on a recording medium and a production process for reproducing the original sound information from the primary recording medium formed by the production process shown in FIG. 9B and recording this on a secondary recording medium. I have.

The production process shown in FIG. 9A is performed, for example, in a music studio or the like, and a performance of a player or the like is collected by a microphone 100 (or a recording medium on which the performance is recorded), and the collected analog sound is collected. The audio information is converted into digital audio data by the A / D converter 101. And
The audio data is digitally recorded on the primary recording medium 103 such as a magnetic tape in the master recorder 102. The primary recording medium 103 on which the performance of the player or the like is recorded is transported as a master tape to a compact disk manufacturing factory (CD press factory).

[0007] The manufacturing process shown in FIG.
This shows a process in a D-press factory. A master reproducing device 105 reproduces audio data from a master tape (primary recording medium 103), and reproduces the audio data from a CD cutting device 10
6 The CD cutting device 106 irradiates a glass master coated with a photosensitive agent (photoresist) with a laser beam that is turned on and off in accordance with audio data from the master player 105 to form pits corresponding to the audio data. To form a memory master (laser cutting). Then, the storage master is nickel-plated to copy the pits formed on the storage master to form a mother stamper which is electroformed by a nickel stamper. As a result, the audio data recorded on the master tape, which is the primary recording medium 103, is recorded on the mother stamper, which is the secondary recording medium.

[0008] The mother stamper is mounted on a mold after a stamper inspection process. Acrylic resin is injection-molded in this mold to form a transparent clear disk, aluminum is vacuum-deposited on the clear disk, and a plastic protective film is laminated to form a compact disk (C
D) is formed.

[0009]

Here, the original sound is indirectly recorded digitally on the secondary recording medium via the primary recording medium 103 in this way, but the digital information is "1". , “0” encoded information,
It is considered that there is no change in sound quality as long as audio information is digitally recorded. However, in actuality, various out-of-code components such as a ripple component (AC component) and a jitter component (waveform fluctuation) as shown in FIG. For this reason, in the above-described indirect recording method, it is a fact that the sound quality is changed even in digital recording.

[0010] Specifically, in the production process shown in FIG.
Noise flows into the A / D converter 101 from the ground via the ground and the ground 101a of the A / D converter 101, or each device via the power lines 101b and 102b of the A / D converter 101 or the master recorder 102. 101, 102
And noise from the master recorder 102 flows into the A / D converter 101 via a connection line 104 connecting the A / D converter 101 and the master recorder 102. A noise loop is formed as shown by the dotted line in FIG. For this reason,
When the analog audio signal from the microphone 100 is digitized by the A / D converter 101, the reference voltage or the like for this digitization changes due to the noise, and the digitized audio data and the original sound are interposed. An error occurs. Therefore, at the stage of this production process, the audio data recorded on the master tape already has audio data having an error from the original sound.

Similarly, in the manufacturing process shown in FIG. 9B, the ground 105a of the master player 105 is connected to the ground 106a of the CD cutting device 106.
The noise flows into the CD cutting device 106 via the CD player, or the noise flows into the respective devices 105 and 106 via the power supply lines 105b and 106b of the master reproducing device 105 or the CD cutting device 106. The master player 1 is connected via a connection line 107 for connecting to the cutting device 106.
When the noise from the 05 side flows into the CD cutting device 106 side, a noise loop is formed as shown by a dotted line in FIG. Therefore, when the audio data reproduced from the master tape is recorded on the glass master by the CD cutting device 106, the noise further causes an error with the original sound (an error in the production process and an error in the manufacturing process). The data will be recorded.

Since the error from the original sound appears as an error in the length of the pit formed on the mother stamper, a compact disc on which sound different from the original sound is recorded is formed by the mother stamper. is not.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has an advantage of an indirect recording method, and is capable of manufacturing an optical disk on which audio information faithful to the original sound is recorded. The purpose is to provide.

[0014]

The optical disk manufacturing system according to the present invention has, as means for solving the above-mentioned problems, interface means for shaping and outputting digital information in a waveform. The interface detects a code of the digital information based on predetermined synchronization information, and reproduces the digital information based on the code detection output.

The digital information is superimposed with extra-code components such as a ripple component and a jitter component. By this interface means, it is possible to form digital information in which the extra-code components are removed from the digital information. it can. Therefore, by recording this digital information on the master recording medium, it is possible to form a master recording medium on which digital information of a digital waveform faithful to the digital waveform of the original information is recorded. Also, for example, a mother stamper is formed based on this master recording medium, and a compact disc is manufactured with the mother stamper, thereby manufacturing a compact disc on which digital information of a digital waveform faithful to the digital waveform of the original information is recorded. be able to.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [Overall Configuration of First Embodiment] An optical disk manufacturing system according to a first embodiment of the present invention has a master disk manufacturing apparatus 1 shown in FIG. 1 and a master disk manufacturing apparatus shown in FIG. Compact disc cutting system 2
(CD cutting system).

[Structure of Master Disc Manufacturing Apparatus] The master disc manufacturing apparatus 1 is installed in, for example, a music studio or the like, and as shown in FIG. , A sound source recorded on a recording medium), an A / D converter 4 for digitizing an analog audio signal collected by the microphone 3 into, for example, 20-bit audio data, and a ripple component (AC component) and jitter, for example. An interface unit 5 for shaping the audio data from the A / D converter 4 on which an out-of-code component such as a component (fluctuation) is superimposed into audio data of a digital waveform faithful to the original sound and outputting the digital audio data; Master recording in which the formed audio data is recorded on a primary recording medium such as a magneto-optical disk to form a master disk 7 And a 6.

[Configuration of CD Cutting System] CD
The cutting system 2 is installed, for example, in a manufacturing factory for compact discs. As shown in FIG. 2, a master player 8 for reproducing audio data recorded on the master disc 7 and the ripple component and jitter An interface unit 9 for shaping the audio data from the master reproducer 8 on which an extra code component such as a component is superimposed into audio data of a digital waveform faithful to the original sound, and outputting the audio data; Is recorded on a mother stamper as a secondary recording medium, and a compact disc is manufactured based on the mother stamper.
And a D-cutting device 10.

[Construction of Interface Unit] (Conceptual Configuration of Interface Unit) The interface unit 5 provided between the A / D converter 4 and the master recorder 6 is conceptually shown in FIG. It has become. FIG. 3 shows an A / D converter 4 and a master recorder 6.
Is shown as a block indicated by a dotted line.

In FIG. 3, the interface unit 5
The input terminal 15 to which the audio data from the A / D converter 4 is supplied, and the audio data supplied via the input terminal 15 are shaped into digital data audio data faithful to the original sound. Transmitting means 16 to the master recorder 6 via an output terminal 19, timing control means 18 for generating timing information necessary for shaping the waveform of the audio data, and timing information from the timing control means 18. And a timing information transmitting means 17 for transmitting to the code transmitting means 16 side.

As shown by a dotted line in FIG. 1, the interface unit 5 is provided between the A / D converter 4 and the master recorder 6.
As a result, electrical, electrostatic and electromagnetic isolation, including power and ground, are completely separated, so that noise from the A / D converter 4 is not transmitted to the master recorder 6. The noise from the master recorder 6 is A /
It is not transmitted to the D converter 4 side.

(Specific Configuration of Interface Unit) Specifically, as shown in FIG. 4, the interface unit 5 receives an A / A signal via the input terminal 15 based on a synchronization signal transmitted from the timing control circuit 28. Synchronization control circuit 2 for synchronizing and outputting audio data supplied from D converter 4
1 and an amplification circuit 22 (amplifier) for amplifying the audio data synchronized with the timing of the synchronization signal with a predetermined gain.
And a light emitting diode 23 driven to emit light in accordance with the audio data from the amplifier 22 and transmitting the audio data as optical data.

The light emitting diode 23 has an anode connected to a power supply line for applying a reference voltage via a resistor R1 and a cathode connected to an output of the amplifier 22. When the audio data supplied from the synchronization control circuit 21 is at a low level (logic 0), a current flows through the light emitting diode 23 to emit light.

The interface unit 5 forms a photocoupler together with the light emitting diode 23, and includes a phototransistor 24 that is turned on / off by optical data transmitted from the light emitting diode 23, and an output of the phototransistor 24. Forming a voice data from the code detection output based on a D flip-flop clock from a timing control circuit 28 and a code detection switch 25 for controlling the output timing of a code detection output indicating the code of the voice data, The audio data output from the A / D converter 4 on which the extra code component is superimposed is shaped into a digital audio data faithful to the original sound, and supplied to the master recorder 6 via the output terminal 19. And a D flip-flop 26.

The phototransistor 24 is provided so as to be inserted and connected between a power supply line to which a reference voltage is applied via a resistor R2 and a sign detection switch 25, and its output (the sign detection output) is provided. , And between the connection between the resistor R2 and the phototransistor 24.

The sign detection switch 25 has a selection terminal grounded, and is turned on only when the switch switching clock from the timing control circuit 28 is at a high level (logic 1). Therefore, the code detection output is low only when the audio data output from the synchronization control circuit 21 is at low level and the switch switching clock supplied from the timing control circuit 28 to the code detection switch 25 is at high level. Becomes In other words, only when the light emitting diode 23 is driven to emit light, the phototransistor 24 is turned on, and the sign detection switch 25 is turned on, the sign detection output becomes low level.

The interface unit 5 includes, for example, a crystal oscillator 27 for generating a reference clock having a predetermined frequency.
A synchronization signal based on the reference clock generated by the crystal oscillator 27, a switch switching clock for switching the code detection switch 25, and a clock input terminal (C
K), a timing control circuit 28 for forming a D flip-flop clock, an amplifier 29 for amplifying a synchronization signal from the timing control circuit 28 with a predetermined gain, and a light emitting diode 3 for optically transmitting the synchronization signal from the amplifier 29.
And a phototransistor 31 that forms a photocoupler with the light emitting diode 30 and receives the synchronization signal transmitted from the light emitting diode 30 and converts it into an electrical synchronization signal and supplies the signal to the synchronization control circuit 21. have.

The light emitting diode 30 has a cathode connected to the output terminal of the amplifier 29, and an anode connected to a power supply line to which a reference voltage is applied via a resistor R3. When the audio data supplied from the amplifier 29 is at a low level (logic 0), a current flows through the light emitting diode 30 to emit light.

The phototransistor 31 is provided so as to be inserted and connected between a power supply line to which a reference voltage is applied via a resistor R4 and the ground, and its output (the synchronization signal) is connected to the resistor R4. The phototransistor 31
It is designed to be taken out from between the connection with.

Although the above description has been given of the configuration of the interface unit 5 provided on the master disk manufacturing apparatus 1, the interface unit 9 provided on the CD cutting system 2 also includes the interface unit 5. 5 has the same configuration. In this case, the audio data from the master reproducer 8 is input to the synchronization control circuit 21, and the output (waveform-shaped audio data) from the D flip-flop 26 is supplied to the CD cutting device 10. Becomes As shown by a dotted line in FIG. 2, the master player 8 and the CD cutting device 10 are completely electrically, electrostatically and electromagnetically separated, including the power supply and the ground, by the interface unit 9. Noise from the master player 8 side
In order not to be transmitted to the cutting device 10 side,
Noise from the CD cutting device 10 is not transmitted to the master player 8.

[Operation of First Embodiment] Next, the operation of the optical disk manufacturing system having the above-described configuration will be described.

[Master Disk Manufacturing Operation] First, FIG.
When a master disk is manufactured by the master disk manufacturing apparatus 1 shown in FIG. 1, the performance of the player is collected by the microphone 3 and this audio signal is supplied to the A / D converter 4. The A / D converter 4 changes the audio signal supplied as an analog signal into audio data, for example, 20-bit digital data, and supplies this to the interface unit 5.

The audio data from the A / D converter 4 is shown in FIG.
Are input to the interface section 5 through the input terminal 15 shown in FIG. The timing control circuit 28 of the interface unit 5 forms a synchronization signal at a predetermined timing as shown in FIG. 5A based on the reference clock from the crystal oscillator 27, and outputs the synchronization signal through the amplifier 29 to the light emitting diode 30. To supply.

The light emitting diode 30 emits light at a low level of the synchronization signal supplied via the amplifier 29, and optically transmits the synchronization signal. The optically transmitted synchronization signal is received by the phototransistor 31. The phototransistor 31 is turned on when the light emitting diode 30 emits light. While the phototransistor 31 is turned off, the reference voltage from the power supply line is supplied to the synchronization control circuit via the resistor R4. When the phototransistor 31 is turned on, this reference voltage is grounded. Is done. Therefore, a signal (synchronous signal) equivalent to the synchronous signal formed by the timing control circuit 28 is supplied to the synchronization control circuit 21.

The synchronization control circuit 21 synchronizes the audio data supplied through the input terminal 15 at the timing of the synchronization signal, and converts the audio data as shown in FIG. The light is supplied to the light emitting diode 23. Note that this audio data is stored in the A / D as shown in FIG.
Non-code components such as a ripple component and a jitter component due to power supply noise or the like generated in the converter 4 are superimposed.

The light emitting diode 23 emits light at the timing when low-level audio data is supplied, and optically transmits this audio data. The optically transmitted audio data is received by the phototransistor 24. The phototransistor 24 is turned on when the light emitting diode 23 emits light. On the other hand, the timing control circuit 28 forms a switch switching pulse as shown in FIG. 5C which goes high for a predetermined short time (only for a moment) in synchronization with the synchronization timing, and sends this to the code detection switch 25. Supply.
The code detection switch 25 is turned on when the high-level switch switching pulse is supplied.

The sign detection output supplied to the data input terminal (D) of the D flip-flop 26 is normally at a high level because the reference voltage from the power supply line via the resistor R2 is applied. However, when both the phototransistor 24 and the sign detection switch 25 are turned on, the reference voltage is grounded and thus goes to a low level. Therefore, only when the audio data shown in FIG. 5B is at a low level and the switch switching pulse shown in FIG. ), A low-level code detection output is supplied.

A clock input terminal (CK) of the D flip-flop 26 is provided with a D flip-flop clock, which is formed by the timing control circuit 28 and becomes low level at the timing of the synchronization signal as shown in FIG. Supplied. The D flip-flop 26 transmits the sign detection output supplied to the data input terminal to the data output terminal (Q) at the rising edge of the D flip-flop clock supplied to the clock input terminal. As a result, FIG.
The digital waveform of the audio data on which the extra code component shown in (b) is superimposed can be shaped into audio data of a digital waveform that is faithful to the original sound as shown in FIG. The waveform-shaped audio data is supplied to the master recorder 6 shown in FIG.

The master recorder 6 magneto-optically records 20-bit audio data supplied via the interface unit 5 on, for example, a magneto-optical disk. As a result, it is possible to form a master disk 7 which is a primary recording medium on which digital waveform audio data faithful to the original sound is recorded.

[Effects of Master Disk Manufacturing Apparatus] The master disk manufacturing apparatus of the optical disk manufacturing system according to the first embodiment is
The A / D converter 4 and the master recorder 6 are completely separated electrically, electrostatically and electromagnetically, including the power supply and the ground, and the code of the audio data from the A / D converter 4 External components are removed to form digital waveform audio data that is faithful to the original sound, and this is recorded on the master disk 7. For this reason, it is possible to prevent the inconvenience that the pit length of the audio data recorded on the master disk 7 is changed due to the superposition of the out-of-code component on the original sound, resulting in a different sound quality. The master disk 7 on which the audio data is recorded can be formed.

In this example, the master recording medium is formed by a magneto-optical disk.
For example, other recording media such as a magnetic tape, a write-once, and a semiconductor memory may be used.

[Operation of CD Cutting System] Next, when a compact disc is manufactured from the master disc 7 in the CD cutting system 2 shown in FIG. 2, the master disc 7 is mounted on the system 2 and the master disc is reproduced. Playback on the device 8. The master reproducer 8 supplies the 20-bit audio data reproduced from the master disk 7 to the interface unit 9. The audio data supplied to the interface unit 9 is obtained by superimposing non-code components such as a ripple component and a jitter component due to power supply noise or the like on the master player 8 side.

As described above, the interface unit 5 provided in the master disk manufacturing apparatus 1 shown in FIG.
The interface unit 9 provided in the CD cutting system 2 shown in FIG. 2 has the same configuration as the master unit 8 and the CD cutting device 10 of the CD cutting system 2. Means completely separated electrically, electrostatically and electromagnetically, including power and ground. The interface unit 9 records the audio data reproduced from the master disk 7 by the master reproducer 8 on the master disk 7 in the form of removing the non-symbol components and shaping the waveform in the same manner as the interface unit 5 described above. It forms audio data of a digital waveform that is faithful to the input audio data and supplies it to the CD cutting device 10 (see FIGS. 4 and 5).

The CD cutting device 10 forms 16-bit audio data from the waveform-shaped 20-bit audio data, and places the 16-bit audio data on a glass master coated with a photosensitive agent (photoresist). Is irradiated with a laser beam whose on / off control is performed in accordance with (1), and a storage master having pits formed according to the audio data is formed (laser cutting).

Next, the CD cutting apparatus 10 applies nickel plating to the storage master to copy the pits formed on the storage master to form a mother stamper which is electroformed by a nickel stamper. Thereby, the audio data recorded on the master disk 7 as the primary recording medium can be recorded on the mother stamper as the secondary recording medium.

This mother stamper is mounted on a mold after a stamper inspection step. CD cutting device 1
In the case of No. 0, a transparent clear disk is formed by injection molding an acrylic resin in this mold. Then, aluminum is vacuum-deposited on the clear disk, and a plastic protective film is laminated thereon to manufacture a compact disk (CD).

[Effects of the CD Cutting System] As described above, the master disk 7 records the digital waveform audio data faithful to the original sound. The CD cutting device 10 is supplied with audio data in a digital waveform faithful to the audio data recorded on the master disk 7 by the interface unit 9. For this reason, audio data of a digital waveform faithful to the original sound is recorded on the mother stamper. Therefore, it is possible to record digital waveform audio data faithful to the original sound on the compact disc manufactured by the mother stamper.

[Effects of the Optical Disc Manufacturing System of the First Embodiment] As is clear from the above description, the first optical disc manufacturing system
The optical disk manufacturing system according to the embodiment forms the master disk 7 on which the digital data of the digital waveform faithful to the original sound is recorded by the interface unit 5 at the time of manufacturing the master disk. The unit 9 forms a mother stamper that records digital waveform audio data that is faithful to the audio data recorded on the master disk 7, and manufactures a compact disk based on the mother stamper. For this reason, when handling the original sound digitally, a compact disc that records digital waveform audio data that is faithful to the original sound without being affected by unsigned components such as ripple components and jitter components superimposed on the audio data. Can be manufactured. Therefore, it is possible to prevent an inconvenience that the sound reproduced from the compact disc is different from the original sound.

Also, the original sound is temporarily stored in the master disk 7.
Despite the indirect recording method of recording the sound recorded on this master disk to the mother stamper secondarily, it is possible to obtain high-quality sound that is faithful to the original sound. it can. Therefore, it is possible to provide a new recording method for obtaining the same high-quality sound as the direct cutting method, while taking advantage of the indirect recording method.

[Modification of First Embodiment] Here, in the master disk manufacturing apparatus 1 shown in FIG. 1, the transfer rate of each output may be different due to the different control format of each unit. For example, master recorder 6
May be higher than the data transfer rate of the preceding A / D converter 4. Similarly, in the CD cutting system 2 shown in FIG. 2, the transfer rate of each output may be different due to the different control format of each unit. For example, the data transfer rate of the master player 8 may be higher than the data transfer rate when audio data is recorded on the master disk 7. In such a case, if the data is processed in the interface unit 5 (9) shown in FIG. 4 based on the fixed-rate synchronization signal formed by the timing control circuit 28, the supplied audio data is If the data transfer rate is other than the above, data processing synchronized with the data transfer rate cannot be performed.

In this modification, the interface unit 5
(9) is configured as shown in FIG. 6 to achieve synchronization according to the data transfer rate of the supplied audio data, thereby enabling the above-described data processing.

That is, the interface unit 5 (9) provided in the optical disk manufacturing system of this modification.
As shown in FIG. 6, together with the synchronization control circuit 21 to the phototransistor 31, the synchronization signal extracted from the audio data supplied from the A / D converter 4 or the master player 8 is sent to the timing control circuit 28. The photocoupler to be supplied (the light emitting diode 33 and the phototransistor 3
4).

In this case, the synchronization control circuit 21 controls the A / D
A synchronizing signal is extracted from the audio data supplied from the converter 4 or the master reproducer 8, and this is optically transmitted through the amplifier 32 and the light emitting diode 33. The phototransistor 34 receives the optically transmitted synchronization signal and supplies it to the timing control circuit 28.

The timing control circuit 28 normally supplies a synchronization signal formed based on a reference clock from the crystal oscillator 27 to the synchronization control circuit 21 side.
If the synchronization signal formed based on the reference clock is different from the synchronization signal supplied through the phototransistor 34, the synchronization signal from the phototransistor 34 is transmitted through the photocoupler including the light emitting diode 30 and the phototransistor 31. The switch control pulse 21 and the D flip-flop clock are formed based on the different synchronization signals, and are supplied to the sign detection switch 25 and the D flip-flop 26.

The synchronization control circuit 21 normally synchronizes the audio data supplied from the A / D converter 4 or the master reproducer 8 with a synchronization signal formed based on a reference clock from the crystal oscillator 27. This is optically transmitted to the phototransistor 24 via the light emitting diode 23. When a synchronization signal is supplied from the phototransistor 34, the signal is supplied from the A / D converter 4 or the master reproducing device 8. The audio data is optically transmitted to the phototransistor 24 side in synchronization with the synchronization signal.

As described above, the code detection switch 25 is supplied with a switch changeover pulse formed based on a different synchronization signal.
With this switch switching pulse, the code of the audio data is detected in synchronization with the audio data, and this code detection output is supplied to the D flip-flop 26. The D flip-flop 26 has a D flip-flop 26 formed based on the different synchronization signals.
By reading the code detection output based on the flip-flop clock, the audio data is shaped into a digital waveform in which non-symbol components of the audio data have been removed, and output.

Thus, according to the data transfer clock of the audio data supplied from the A / D converter 4 or the master reproducer 8, a waveform shaping process synchronized with the data transfer clock can be made possible.

[Second Embodiment] Next, a second embodiment of the present invention will be described.
An optical disk manufacturing system according to the embodiment will be described.
The optical disk manufacturing system according to the first embodiment described above includes:
In the interface unit 5 (or the interface unit 9) shown in FIG. 4, the waveform shaping process of the audio data is performed at the timing of the synchronizing signal formed by itself, but the optical disk manufacturing according to the second embodiment described below. In the system, the interface unit 5 (or the interface unit 9) performs a waveform shaping process on the supplied audio data at a timing of a synchronization signal attached to header information or the like of the supplied audio data. It should be noted that the above-described first embodiment differs from the second embodiment only in this point, and hence only the different point will be described below, and redundant description will be omitted.

[Structure of the Second Embodiment] That is, in the optical disk manufacturing system of the second embodiment, the interface unit 5 or 9 has the structure shown in FIG. Specifically, in FIG. 6, the interface unit 5 (or the interface unit 9) supplies audio data (audio data from the A / D converter 4 or audio data from the master reproducer 8) supplied through the input terminal 15. A synchronization control circuit 35 for detecting a synchronization signal attached to header information or the like of audio data), a light emitting diode 37 for optically transmitting the synchronization signal, a phototransistor 38 for receiving the optically transmitted synchronization signal, And a timing control circuit 39 for generating a D flip-flop clock to be supplied to the D flip-flop 26, and a switch switching pulse for switching the code detection switch 25 based on a synchronization signal captured by the phototransistor 38. doing.

[Operation of the Second Embodiment] Such an interface unit 5 (or interface unit 9)
For example, when audio data as shown in FIG. 7A is supplied through the input terminal 15, the audio data is supplied to the light emitting diode 23 via the amplifier 22 and optically transmitted, as described above. The synchronization signal included in the head of the audio data is detected each time, and the
To the light emitting diode 37 via

When the audio data supplied via the input terminal 15 is supplied at a predetermined data length and at a predetermined interval (for example, at 64 clock intervals), once the synchronization signal can be detected, the next Since the synchronization signal can be predicted to be detected after 64 clocks, for example, the clock counting is started from the timing when the synchronization signal is first detected, and thereafter, the synchronization signal is formed and output every 64 clocks. Is also good.

The light emitting diode 37 has its cathode connected to the output of the amplifier 36 and its anode connected to a power supply line to which a reference voltage is applied via a resistor R5.
When the synchronization signal supplied from the synchronization control circuit 35 is at a low level (logic 0), a current flows through the light emitting diode 37 to emit light. For this reason, the light emitting diode 37 emits light at the head timing of the audio data shown in FIG. 7A and performs optical transmission of the synchronization signal.

The synchronization signal optically transmitted from the light emitting diode 37 is received by a phototransistor 38 forming a photocoupler together with the light emitting diode 37.
The phototransistor 38 is provided so as to be inserted and connected between the power supply line of the reference voltage to which the reference voltage is applied and the ground. The output is taken out between the connection between the resistor R6 and the phototransistor 38. For this reason, when the phototransistor 38 is off, the reference voltage supplied from the power supply line via the resistor R6 is supplied to the timing control circuit 39, but receives the optically transmitted synchronization signal. When the phototransistor 38 is turned on, the reference voltage supplied from the power supply line via the resistor R6 is grounded, so that the voltage supplied to the timing control circuit 39 is low as shown in FIG. Level.
The timing control circuit 39 captures this low-level signal as a synchronization signal. Then, based on this synchronization signal, a switch switching pulse as shown in FIG. 7E is formed and supplied to the code detection switch 25, and a D flip-flop clock as shown in FIG. It is supplied to the D flip-flop 26.

On the other hand, the audio data optically transmitted through the light emitting diode 23 is received by the photocoupler 24, and an extra code component is superimposed on this audio data as shown in FIG. doing. For this reason, the code detection switch 25 detects the code of the audio data as described above by turning on and off based on the switch switching pulse, and outputs the code detection output as shown in FIG. Supply. D flip-flop 26
By reading the code detection output based on the D flip-flop clock, the digital data can be faithfully reproduced as digital waveform audio data as shown in FIG. 7 (g) or audio data recorded on the master disk 7. The digital audio data is formed into a digital waveform and supplied to the master recorder 6 or the CD cutting device 10 through the output terminal 19.

[Effects of the Optical Disc Manufacturing System of the Second Embodiment] As a result, audio data faithful to the original sound can be recorded on the master disk 7, and audio data faithful to the original sound can be recorded from the master disk 7. Thus, the same effects as those of the optical disk manufacturing system according to the first embodiment can be obtained.

[Other Application Examples] In the description of the above embodiments, the optical disk manufacturing system according to the present invention
Although the present invention is applied to a system for manufacturing a compact disk, the present invention can be applied to a system for manufacturing other optical disks such as a digital video disk.

In order to facilitate understanding of the present invention,
For example, the A / D converter 4 forms 20-bit audio data, and the CD cutting apparatus 10 has been described with specific numerical values such as manufacturing a compact disc recording 16-bit audio data. This can be changed according to the design or the like.

Finally, the description of each of the above embodiments is merely an example of the present invention. For this reason, the present invention is not limited to this embodiment, and it is needless to say that various modifications can be made without departing from the technical idea of the present invention.

[0069]

The optical disk manufacturing system according to the present invention makes it possible to manufacture an optical disk in which audio information faithful to the original sound is recorded, while taking advantage of the indirect recording method.

[Brief description of the drawings]

FIG. 1 is a block diagram of a master disk manufacturing apparatus that constitutes an optical disk manufacturing system according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a CD cutting system included in the optical disc manufacturing system according to the first embodiment.

FIG. 3 is a diagram for explaining the concept of an interface unit provided in the master disk manufacturing apparatus.

FIG. 4 is a specific block diagram of the interface unit.

FIG. 5 is a time chart for explaining the operation of the interface unit.

FIG. 6 is a block diagram showing a modification of the interface unit provided in the optical disc manufacturing system according to the first embodiment.

FIG. 7 is a block diagram illustrating a configuration of an interface unit provided in an optical disc manufacturing system according to a second embodiment of the present invention.

FIG. 8 is a time chart for explaining an operation of an interface unit provided in the optical disc manufacturing system according to the second embodiment.

FIG. 9 is a diagram for explaining a conventional compact disc manufacturing process.

FIG. 10 is a diagram for explaining a change in sound quality caused by an out-of-code component superimposed on audio data handled in a conventional compact disc manufacturing process.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Master disk manufacturing apparatus, 2 ... CD cutting system, 3 ... Microphone, 4 ... A / D converter, 5,
Reference numeral 9: interface unit, 6: master recorder, 7: master disk, 8: master player, 10: CD cutting device, 21: synchronization control circuit, 23, 30, 3
3: light emitting diode, 24, 31, 34: phototransistor, 25: sign detection switch, 26: D flip-flop, 27: crystal oscillator, 28: timing control circuit

Claims (10)

[Claims] 1. A digital information conversion means for converting information to be recorded into digital information, a synchronization information generation means for generating synchronization information of a predetermined period, a first optical transmission means for optically transmitting the synchronization information, A first light receiving means for receiving the synchronization information optically transmitted from the first light transmitting means; and a digital information from the digital information converting means for converting the digital information from the digital information converting means into the synchronization information received by the first light receiving means. Synchronization control means for synchronizing and outputting, second optical transmission means for optically transmitting digital information from the synchronization control means, and receiving digital information optically transmitted from the second optical transmission means A second light receiving unit, a code detecting unit that detects a code of the digital information received by the second light receiving unit based on the synchronization information from the synchronization information generating unit, and outputs the code detection information; The synchronization information An interface comprising waveform shaping means for shaping and outputting digital information optically transmitted from the synchronization control means by reading the code detection information from the code detection means based on the synchronization information from the generation means. And a master recording medium for recording digital information waveform-shaped by the interface means on a master recording medium serving as a recording medium from which an optical disc is manufactured. 2. A digital information conversion means for converting information to be recorded into digital information, and a synchronization information light for extracting synchronization information attached to the digital information from the digital information conversion means and optically transmitting the synchronization information. Transmitting means, synchronizing information light receiving means for receiving the synchronizing information optically transmitted from the synchronizing information light transmitting means, digital information light transmitting means for optically transmitting digital information from the digital information converting means, and the digital information light Digital information receiving means for receiving digital information from the transmitting means, and a code of the digital information received by the digital information receiving means is detected based on the synchronization information received by the synchronization information receiving means. Code detection means for outputting the code detection information from the code detection means based on the synchronization information received by the synchronization information reception means. By reading the digital information from the digital information light transmitting means, and shaping the digital information optically transmitted from the digital information light transmitting means, and outputting the digital information. A master recording medium for recording on a master recording medium serving as an original recording medium to be recorded. 3. A digital information conversion unit for converting information to be recorded into digital information, a synchronization information extraction unit for extracting synchronization information from digital information from the digital information conversion unit, and a synchronization unit for generating synchronization information of a predetermined period. An information generating unit, a first optical transmitting unit for optically transmitting the synchronization information generated by the synchronous information generating unit, or the synchronous information extracted by the synchronous information extracting unit; and a first optical transmitting unit. First light receiving means for receiving the optically transmitted synchronization information, and synchronization control means for synchronizing and outputting the digital information from the digital information conversion means with the synchronization information received by the first light receiving means A second optical transmitter for optically transmitting digital information from the synchronization controller, and a second optical receiver for receiving digital information optically transmitted from the second optical transmitter. Means for detecting the code of the digital information received by the second light receiving means based on the synchronization information from the synchronization information generating means or the synchronization information extracted by the synchronization information extracting means. Code detection means for outputting detection information;
By reading the code detection information from the code detection unit based on the synchronization information from the synchronization information generation unit or the synchronization information extracted by the synchronization information extraction unit,
An interface unit comprising a waveform shaping unit for shaping and outputting digital information optically transmitted from the synchronization control unit; and a digital information waveform shaped by the interface unit, a recording medium from which an optical disc is manufactured. And a master recording means for recording on a master recording medium. 4. Master information reproducing means for reproducing digital information from a master recording medium on which digital information for recording on an optical disk is recorded; synchronization information generating means for generating synchronization information of a predetermined period; A first optical transmitting unit for performing optical transmission, a first optical receiving unit for receiving synchronization information optically transmitted from the first optical transmitting unit, and digital information from the master reproducing unit, Synchronization control means for synchronizing and outputting the synchronization information received by the light receiving means, second optical transmission means for optically transmitting digital information from the synchronization control means, and second optical transmission means A second light receiving means for receiving the digital information optically transmitted from the means, and a sign of the digital information received by the second light receiving means based on the synchronization information from the synchronization information generating means. Code detection means for outputting code detection information; and digital information optically transmitted from the synchronization control means by reading the code detection information from the code detection means based on the synchronization information from the synchronization information generation means. An optical disc manufacturing apparatus comprising: an interface unit having a waveform shaping unit for shaping and outputting a waveform; and an optical disc manufacturing unit for manufacturing an optical disc based on the digital information waveform-shaped by the interface unit. 5. A master reproducing means for reproducing digital information from a master recording medium on which digital information to be recorded on an optical disk is recorded, and extracting synchronization information attached to the digital information from the master reproducing means. A synchronization information light transmitting means for optically transmitting the synchronization information, a synchronization information light receiving means for receiving the synchronization information optically transmitted from the synchronization information light transmitting means, and a digital light for optically transmitting digital information from the master reproducing means. Information light transmitting means, digital information receiving means for receiving digital information from the digital information light transmitting means, and digital information received by the digital information receiving means based on the synchronization information received by the synchronization information receiving means Code detection means for detecting the code of
A waveform for shaping and outputting digital information optically transmitted from the digital information light transmitting means by reading code detection information from the code detecting means based on the synchronization information received by the synchronization information light receiving means. An optical disk manufacturing apparatus comprising: an interface unit having a shaping unit; and an optical disk manufacturing unit that manufactures an optical disk based on digital information waveform-shaped by the interface unit. 6. A master reproducing means for reproducing digital information from a master recording medium on which digital information to be recorded on an optical disk is recorded, and a synchronization information extracting means for extracting synchronization information from the digital information from the master reproducing means. Synchronization information generating means for generating synchronization information of a predetermined period; and first optical transmission for optically transmitting the synchronization information generated by the synchronization information generation means or the synchronization information extracted by the synchronization information extraction means. Means, first light receiving means for receiving synchronization information optically transmitted from the first light transmitting means, and synchronization information received by the first light receiving means for receiving digital information from the master reproducing means. Synchronization control means for synchronizing and outputting digital information, and a second means for optically transmitting digital information from the synchronization control means.
An optical transmitting unit, a second optical receiving unit that receives digital information optically transmitted from the second optical transmitting unit, and synchronization information from the synchronization information generating unit or extracted by the synchronization information extracting unit. Code detecting means for detecting the code of the digital information received by the second light receiving means based on the synchronization information, and outputting the code detection information; and the synchronization information from the synchronization information generating means, or Waveform shaping means for shaping and outputting digital information optically transmitted from the synchronization control means by reading the code detection information from the code detection means based on the synchronization information extracted by the synchronization information extraction means. Interface means comprising: an optical disc manufacturing means for manufacturing an optical disc based on digital information waveform-shaped by the interface means. Optical disk manufacturing equipment. 7. Digital information conversion means for converting information to be recorded into digital information, synchronization information generation means for generating synchronization information of a predetermined period, first optical transmission means for optically transmitting the synchronization information, A first light receiving means for receiving the synchronization information optically transmitted from the first light transmitting means; and a digital information from the digital information converting means for converting the digital information from the digital information converting means into the synchronization information received by the first light receiving means. Synchronization control means for synchronizing and outputting, second optical transmission means for optically transmitting digital information from the synchronization control means, and receiving digital information optically transmitted from the second optical transmission means A second light receiving unit, a code detecting unit that detects a code of the digital information received by the second light receiving unit based on the synchronization information from the synchronization information generating unit, and outputs the code detection information; The synchronization information A waveform shaping means for shaping and outputting digital information optically transmitted from the synchronization control means by reading the code detection information from the code detection means based on the synchronization information from the generation means. 1 interface means; master recording means for recording digital information waveform-shaped by the first interface means on a master recording medium serving as a recording medium from which an optical disc is manufactured; and , A synchronization information generating means for generating synchronization information of a predetermined period, a first optical transmission means for optically transmitting the synchronization information, and an optical signal transmitted from the first optical transmission means. First light receiving means for receiving synchronization information, and digital information from the master reproducing means being received by the first light receiving means. Synchronization control means for synchronizing and outputting the synchronized information, second optical transmission means for optically transmitting digital information from the synchronization control means, and optical transmission from the second optical transmission means. A second light receiving means for receiving the digital information, and detecting a code of the digital information received by the second light receiving means on the basis of the synchronization information from the synchronization information generating means, and outputting the code detection information. A code detector, and reads the code detection information from the code detector based on the synchronization information from the synchronization information generator, thereby waveform-shaping and outputting digital information optically transmitted from the synchronization controller. A second interface unit including a waveform shaping unit that performs a waveform shaping process, and an optical disc that manufactures an optical disc based on the digital information that has been waveform-shaped by the second interface unit. An optical disk manufacturing system having manufacturing means. 8. A digital information conversion means for converting information to be recorded into digital information, a synchronization information light for extracting synchronization information attached to the digital information from the digital information conversion means, and optically transmitting the synchronization information. Transmitting means, synchronizing information light receiving means for receiving the synchronizing information optically transmitted from the synchronizing information light transmitting means, digital information light transmitting means for optically transmitting digital information from the digital information converting means, and the digital information light Digital information receiving means for receiving digital information from the transmitting means, and a code of the digital information received by the digital information receiving means is detected based on the synchronization information received by the synchronization information receiving means. Code detection means for outputting the code detection information from the code detection means based on the synchronization information received by the synchronization information reception means. And a waveform shaping means for shaping and outputting the digital information optically transmitted from the digital information light transmitting means by reading the digital information light transmitting means, and a digital waveform shaped by the first interface means. Master recording means for recording information on a master recording medium serving as a recording medium from which an optical disc is manufactured; master reproducing means for reproducing the digital information from the master recording medium; and digital information from the master reproducing means. A synchronization information light transmitting means for optically transmitting the synchronization information, a synchronization information light receiving means for receiving the synchronization information optically transmitted from the synchronization information light transmission means, and Digital information light transmitting means for optically transmitting digital information, and the digital information light transmitting means Digital information receiving means for receiving the digital information, and a code of the digital information received by the digital information receiving means is detected based on the synchronization information received by the synchronization information receiving means, and the code detection information is output. Code detecting means for
A waveform for shaping and outputting digital information optically transmitted from the digital information light transmitting means by reading code detection information from the code detecting means based on the synchronization information received by the synchronization information light receiving means. An optical disc manufacturing system, comprising: second interface means having a shaping means; and optical disc manufacturing means for manufacturing an optical disc based on digital information waveform-shaped by the second interface means. 9. A digital information converting means for converting information to be recorded into digital information, a synchronizing information extracting means for extracting synchronizing information from digital information from the digital information converting means, and a synchronizing means for generating synchronizing information of a predetermined period. An information generating unit, a first optical transmitting unit for optically transmitting the synchronization information generated by the synchronous information generating unit, or the synchronous information extracted by the synchronous information extracting unit; and a first optical transmitting unit. First light receiving means for receiving the optically transmitted synchronization information, and synchronization control means for synchronizing and outputting the digital information from the digital information conversion means with the synchronization information received by the first light receiving means A second optical transmitter for optically transmitting digital information from the synchronization controller, and a second optical receiver for receiving digital information optically transmitted from the second optical transmitter. Means for detecting the code of the digital information received by the second light receiving means based on the synchronization information from the synchronization information generating means or the synchronization information extracted by the synchronization information extracting means. Code detection means for outputting detection information;
By reading the code detection information from the code detection unit based on the synchronization information from the synchronization information generation unit or the synchronization information extracted by the synchronization information extraction unit,
A first interface unit including a waveform shaping unit for shaping and outputting digital information optically transmitted from the synchronization control unit, and manufacturing an optical disc by using the digital information waveform shaped by the first interface unit. Master recording means for recording on a master recording medium serving as an original recording medium for performing recording; master reproduction means for reproducing the digital information from the master recording medium; and synchronization information for extracting synchronization information from digital information from the master reproduction means. Extracting means, synchronizing information generating means for generating synchronizing information of a predetermined period, and first optical transmission of the synchronizing information generated by the synchronizing information generating means or the synchronizing information extracted by the synchronizing information extracting means. An optical transmitting unit; a first optical receiving unit that receives synchronization information optically transmitted from the first optical transmitting unit; And synchronization control means for outputting the digital information from the master playback means in synchronization with the synchronization information is received by the first light receiving means, second for optical transmission of digital information from the synchronization control means
An optical transmitting unit, a second optical receiving unit that receives digital information optically transmitted from the second optical transmitting unit, and synchronization information from the synchronization information generating unit or extracted by the synchronization information extracting unit. Code detecting means for detecting the code of the digital information received by the second light receiving means based on the synchronization information, and outputting the code detection information; and the synchronization information from the synchronization information generating means, or Waveform shaping means for shaping and outputting digital information optically transmitted from the synchronization control means by reading the code detection information from the code detection means based on the synchronization information extracted by the synchronization information extraction means. An optical disk manufacturing apparatus for manufacturing an optical disk based on digital information waveform-shaped by the second interface means. Optical disc manufacturing system having means. 10. A step of converting information to be recorded into digital information; a step of resampling the digital information with a predetermined synchronous clock to form a waveform of the digital information; Recording the digital information from a master recording medium serving as a recording medium from which the optical disk is manufactured; reproducing the digital information from the master recording medium; and resampling the reproduced digital information with a predetermined synchronous clock. Thus, an optical disc manufacturing method, comprising the steps of: shaping the digital information into a waveform; and manufacturing an optical disc based on the waveform-shaped digital information.