JPH09320195A - Compound equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify circuit constitution, while keeping a function as a compound equipment by sharing servo means of first, second recording or reproducing head system. SOLUTION: When a magnetooptical disk(MO) 90 is recorded or reproduced, a system controller 21 makes a servo circuit 8 an MD answering mode, and performs execution control of required servo operation. A switch part 28 selects an MD recording/reproducing drive system side, and outputs an output of a servo driver 9 to a spindle motor 1, a biaxial mechanism 3 and a thread mechanism 4. On the other hand, when a compact disk(CD) 91 is reproduced, the system controller 21 makes the servo circuit 8 a CD-answering mode and performs the execution control of the required servo operation. The switch part 28 selects a CD-reproducing driven system, and outputs the output of the servo driver 9 to the spindle motor 31, the biaxial mechanism 33 and the thread mechanism 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite device provided with a first recording / reproducing head system and a second recording / reproducing head system, or a first recording medium and a second recording medium with one head mechanism. The present invention relates to a composite device that can handle media.

[0002]

2. Description of the Related Art Recording / playback devices compatible with audio data media such as CDs (compact discs) and MDs (minidiscs) are in widespread use.
A CD / MD composite device in which a D recording / reproducing device unit is integrally provided has also been developed. For example, the structure of the CD / MD composite device is as shown in FIG.

First, as a recording / reproducing drive system for the MD 90, a spindle motor 51, an optical head 52, a sled mechanism 53, a servo driver 54, an RF amplifier 55,
A servo circuit 56, a magnetic head 57, and a magnetic head driver 58 are provided. As the operation of this recording / reproducing drive system, the spindle motor 51 drives the MD90 for CLV rotation, and the optical head 52 and the RF amplifier 55 drive the MD90.
Extraction of voice data and servo information from thread, thread mechanism 5
3 and focus / tracking / sled servo operation by a biaxial mechanism that supports the objective lens in the optical head 52, and data recording operation on the MD 90 by the magnetic head 57, the magnetic head driver 58, and the optical head 52. Focus servo, tracking servo, sled servo, and CLV servo are controlled / executed by the servo circuit 56 and the servo driver 54.

As a signal processing system for decoding reproduction data from the MD90 and encoding recording data to the MD90, EFM encoder / decoders 61, E
FM-PLL circuit 59, ECC encoder / decoder 6
2, a sector encoder / decoder 63, a voice compression encoder / decoder 68, a subcode decoder 64, a groove PLL circuit 60, and a groove decoder 65 are provided.

During reproduction of the MD 90, the audio data extracted by the RF amplifier 55, that is, the EFM signal is supplied to the EFM encoder / decoder 61 and EFM demodulated. The EFM-PLL is used as a clock for decoding processing.
The reproduction clock CK synchronized with the reproduction EFM signal in the circuit 59
_EFM is generated. Further, the subcode decoder 64 extracts the address and other subcode information. EFM
The demodulated data is subjected to error correction decoding by the ECC encoder / decoder 62 and the sector encoder / decoder 6
3 for sector decoding, audio compression encoder / decoder 68 for audio compression decoding (decompression processing for audio compression)
Is performed, the digital audio data of 16-bit quantization and 44.1 KHz sampling format is demodulated.

In order to realize the so-called shock proof function, the processing from the data reproduction from the MD 90 to the sector decoding is intermittently performed at a high speed, and the sector decoded data is stored in the memory controller 67.
D-RAM (buffer memory) 66 once under the control of
Is stored in Then, the data continuously read from the buffer memory 66 at the normal rate is subjected to voice compression decoding by the voice compression encoder / decoder 68, and demodulated to the original digital voice data in the time axis state. The demodulated digital audio data is the multiplexer 7
It is converted into an analog audio signal by the D / A converter 71 via 0 and is output from the output terminal 72 as a reproduced audio signal.

When recording on the MD 90, the analog audio signal input from the input terminal 73 is A
In the / D converter 74, digital audio data of 16-bit quantization and 44.1 KHz sampling form is supplied to the audio compression encoder / decoder 68 via the multiplexer 75 and audio compression encoded.

Then, the data is temporarily stored in the buffer memory 66 under the control of the memory controller 67, and is read out when the data storage amount reaches a predetermined amount. The sector encoder / decoder 63 performs sector encoding and the ECC encoder / decoder 62 corrects errors. Encoding for adding a code and EFM encoding by the EFM encoder / decoder 61 are performed. The EFM signals generated by these encoding processes are supplied to the magnetic head driver 58 as actual recording data and used for the magnetic field applying operation by the magnetic head 57. In addition, at the time of recording MD9
The absolute address is read from the 0 groove and the processing clock is generated. This operation is performed by the groove PLL circuit 60 and the groove decoder 65.

A circuit system for the MD 90 is constructed as described above, and a reproduction drive system and a signal processing system for the CD 91 are provided. First, a spindle motor 81, an optical head 82, a sled mechanism 83, a servo driver 84, an RF amplifier 85, and a servo circuit 86 are provided as a reproduction drive system for the CD 91.

As the operation of the reproducing drive system, the spindle motor 81 drives the CLV to rotate the CD 91, the optical head 82 and the RF amplifier 85 extract audio data and servo information from the CD 91, the sled mechanism 83 and the objective in the optical head 82. Focus / tracking / sled servo operation is performed by a biaxial mechanism that supports the lens. Focus servo, tracking servo, sled servo, and CLV servo are controlled / executed by the servo circuit 86 and the servo driver 84.

Further, as a signal processing system for decoding the reproduction data from the CD 91, EFM decoders 88, E
An FM-PLL circuit 87, an ECC decoder 89, and a subcode decoder 90 are provided. When playing CD91,
The audio data extracted by the RF amplifier 85, that is, the EFM signal is supplied to the EFM decoder 88 and EFM demodulated. As a clock for decoding processing, EFM-
The PLL circuit 87 generates a reproduction clock CK _EFM synchronized with the reproduction EFM signal. Also, the subcode decoder 90
By this, the address and other subcode information are extracted.

The EFM demodulated data is error-corrected and decoded by the ECC decoder 62 to be demodulated into digital audio data of 16-bit quantization and 44.1 KHz sampling form. The demodulated digital audio data is converted into an analog audio signal by the D / A converter 71 via the multiplexer 70 and is output from the output terminal 72 as a reproduced audio signal.

Also, reproduced audio data from the CD 91 is transferred to the MD.
It is also possible to perform dubbing recording on 90, and in this case, EC
The reproduced digital audio data output from the C decoder 89 is supplied to the audio compression encoder / decoder 68 via the multiplexer 75, and the above-described recording data processing for the MD 90 is performed.

The respective operations of the recording / reproducing drive system and the signal processing system for the MD 90 and the reproducing drive system and the signal processing system for the CD 91 as described above are controlled by a system controller 69 formed by a microcomputer. The user operation is performed by the operation unit 91, and the display unit 92 outputs and outputs various information to the user.

[0015]

By configuring the CD / MD composite device as described above, CD reproduction, MD recording,
Operations such as MD reproduction and dubbing recording from CD to MD can be easily performed, and the device can be made convenient for the user. However, as can be seen from FIG. 13, the signal processing system corresponding to the MD90 and the signal processing system corresponding to the CD91 must be provided independently, which makes the circuit configuration of the complex device complicated and large in scale. Problems such as an increase in the number of parts occur, making it difficult to reduce the size and cost.

Further, there is a problem that the power consumption also increases as the circuit configuration becomes larger. Further, since the system controller 69 has a large number of circuits to be controlled, the number of ports required for the microcomputer also increases, which causes a problem that the microcomputer to be mounted is upsized and the processing load increases.

[0017]

SUMMARY OF THE INVENTION In view of these problems, it is an object of the present invention to realize a simplified circuit configuration and higher performance while maintaining the operation function as a composite device.

Therefore, as a compound device, the first recording or reproducing head system for executing the recording or reproducing operation of the data on the first recording medium and the second recording medium of the same type or a different type from the first recording medium. A second recording or reproducing head system for performing a data recording or reproducing operation on a recording medium is provided, and selectively to the first recording or reproducing head system and the second recording or reproducing head system. By providing a servo drive signal, there is provided a servo means capable of selecting one of the first recording or reproducing head system and the second recording or reproducing head system to execute the recording or reproducing operation. . That is, the servo means is shared between the first and second recording or reproducing head systems.

Further, the recording or reproducing operation position of the first recording medium and the second recording medium of the same or different type from the first recording medium.
The head mechanism is formed so as to be movable with respect to the recording or reproducing operation position of the recording medium, and the servo means is provided with respect to the head mechanism when the head mechanism is in the recording or reproducing operation position of the first recording medium. A servo drive signal corresponding to the recording or reproducing operation of the first recording medium is supplied to execute the recording or reproducing operation of the first recording medium, and the head mechanism moves to the recording or reproducing operation position of the second recording medium. When it is set, a servo drive signal corresponding to the recording or reproducing operation of the second recording medium is supplied to the head mechanism so that the recording or reproducing operation of the second recording medium can be executed. . That is, the head mechanism and the servo means are commonly used for the recording or reproducing operation for the first recording medium and the recording or reproducing operation for the second recording medium.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION A CD / MD composite device will be described below as an embodiment of the present invention. The description will be made in the following order. 1. 1. First configuration example of CD / MD composite device Operation during MD playback 3. Operation during MD recording 4. Operation during CD playback 5. Operation during CD-MD dubbing 6. 6. Second configuration example of CD / MD composite device 7. Operation during CD-MD dubbing in the second configuration example 7. Third configuration example of CD / MD composite device Operation during CD-MD dubbing in the third configuration example

1. Configuration Example of CD / MD Composite Device FIG. 1 shows a configuration example of the CD / MD composite device of this example. In this example, an MD recording / reproducing device unit using the MD90 as a recording medium and a CD reproducing device unit using the CD91 as a recording medium are combined devices.

In FIG. 1, the MD 90 is mounted in a portion which constitutes the MD recording / reproducing drive system. The MD recording / reproducing drive system includes a spindle mechanism that rotationally drives the MD 90, and an M
The D90 is composed of a head mechanism that actually executes recording / reproducing operations and a servo / drive system for driving the head mechanism and the spindle mechanism.

A spindle motor 1 and a chucking mechanism (not shown) are provided as the spindle mechanism for the MD 90. As the head mechanism, the optical head 2,
A biaxial mechanism 3, a sled mechanism 4, and a magnetic head 6 in the optical head 2 are provided. An RF amplifier 5, a magnetic head driver 7, a servo circuit 8, a servo driver 9, and a switching unit 28 are provided as a servo / drive system for driving the spindle mechanism and the head mechanism for the MD 90.

Further, the CD 91 is loaded in a portion which will be a CD reproducing drive system. CD recording / playback drive system is CD9
It is composed of a spindle mechanism that drives 0 to rotate, a head mechanism that actually performs recording / reproducing operations on the CD 91, and a servo / drive system that drives the head mechanism and the spindle mechanism.

As a spindle mechanism for the CD 91, a spindle motor 31 and a chucking mechanism (not shown) are provided. As a head mechanism, the optical head 3
2, biaxial mechanism 33 in optical head 2, sled mechanism 34
Is provided. In this example, no dedicated circuit system is provided as a servo / drive system for driving the head mechanism for the CD 91 and the spindle motor 31,
The F amplifier 5, the servo circuit 8, the servo driver 9, and the switching unit 28 also drive the head mechanism and the spindle motor 31 for the CD 91.

Further, in this example, a signal processing system for decoding reproduction data from the MD90 and encoding recording data to the MD90 and a signal processing system for decoding reproduction data from the CD91 are shared. As this signal processing system, an EFM encoder / decoder 11, an EFM-PLL circuit 12, an ECC encoder /
Decoder 16, sector encoder / decoder 17, audio compression encoder / decoder 19, subcode decoder 14, groove PLL circuit 13, groove decoder 15
Is provided. Further, a D-RAM (buffer memory) 20 used for realizing a shock proof function, which will be described later, and an operation during CD-MD dubbing, and a memory controller 18 for controlling write / read operation of the buffer memory 20 are provided. .

MD to be loaded in MD recording / reproducing drive system
The (magneto-optical disk) 90 is used as a medium capable of recording audio data, and is rotated by the spindle motor 1 during recording / reproduction. The optical head 2 irradiates the MD 90 with laser light at the time of recording / reproducing to record / record.
Performs the operation as a head during playback. That is, at the time of recording, a high level laser output for heating the recording track to the Curie temperature is provided, and at the time of reproduction, a relatively low level laser output for detecting data from reflected light by the magnetic Kerr effect is provided.

Therefore, the optical head 2 is equipped with a laser diode as a laser output means, an optical system including a polarization beam splitter and an objective lens 2a, and a detector for detecting reflected light. Objective lens 2a
Is the radial direction of MD90 and MD90 by the biaxial mechanism 3.
Is held so as to be displaceable in the direction of contact with and separated from the optical head 2, and the optical head 2 as a whole is movable in the radial direction of the MD 90 by the sled mechanism 4. The laser output from the laser diode is controlled to a constant level by the servo circuit 8, and the servo circuit 8 switches between high level and low level based on an instruction (recording / reproducing) from the system controller 21.

Further, the magnetic head 6 is arranged at a position facing the optical head 2 with the MD 90 interposed therebetween. The magnetic head 6 operates to apply a magnetic field modulated by the supplied data to the MD 90. The magnetic head 6 is movable in the disk radial direction by the sled mechanism 4 together with the optical head 2.

Information detected from the MD 90 by the optical head 2 by the reproducing operation with respect to the MD 90 is supplied to the RF amplifier 5 via the multiplexer 10. The RF amplifier 5 calculates the supplied RF signal (EFM signal), the tracking error signal TE, the focus error signal FE, and the groove information GV (absolute position recorded in the MD 90 as a pre-groove (wobbling groove)) by processing the supplied information. Information) etc. are extracted. Extracted playback R
F signal is binarized and EFM signal (8-14 modulated signal)
And the EFM encoder / decoder 11 and EFM-
It is supplied to the PLL circuit 12. Further, the tracking error signal TE and the focus error signal FE are supplied to the servo circuit 8, and the groove information GV is supplied to the groove PLL circuit 13.
And the groove decoder 15.

The servo circuit 8 supplies the tracking error signal TE, the focus error signal FE, and the system controller 2 composed of a microcomputer.
1, various servo drive signals (tracking drive signal, focus drive signal, track jump command, access command, spindle motor 2 rotation speed detection information, etc.)
Sled drive signal, CLV drive signal).

That is, the focus error signal FE is subjected to phase compensation processing or the like to generate a focus drive signal, which is supplied to the servo driver 9. During MD recording / reproduction, the switching unit 28 is switching-controlled so that the output of the servo driver 9 is output to the spindle motor 1, the biaxial mechanism 3, and the sled mechanism 4. Therefore, the servo driver 9 applies power to the focus coil of the biaxial mechanism 3 according to the focus drive signal, and based on the focus error signal FE extracted by the RF amplifier from the information obtained by the optical head 2, The focus control system that drives the objective lens 3 in the focus direction functions.

Further, the servo circuit 8 performs a phase compensation process or the like on the tracking error signal TE to generate a tracking drive signal and supplies it to the servo driver 9. Then, the servo driver 9 applies power according to the tracking drive signal to the tracking coil of the biaxial mechanism 3 according to the output path of the switching unit 28. That is, based on the tracking error signal TE extracted by the RF amplifier from the information obtained by the optical head 2,
A tracking control system that drives the objective lens 3 in the tracking direction functions.

Further, the servo circuit 8 generates a sled drive signal from the low frequency component of the tracking error signal TE,
Supply to the servo driver 9. The servo driver 9 drives the sled mechanism 4 according to the sled driving signal via the switching unit 28, and drives the optical head 2 and the magnetic head 6 in the disk radial direction. Therefore, the sled control system for slidingly driving the optical head 2 and the magnetic head 6 functions based on the tracking error signal TE extracted by the RF amplifier from the information obtained by the optical head 2. At the time of access operation, the system controller 21
The sled drive signal is generated in response to the instruction from the sled mechanism 4, and the sled mechanism 4 is driven.

Further, the servo circuit 8 compares the rotation speed detection information of the spindle motor 2 with the reference speed information, and thereby CL for keeping the rotation of the spindle motor 1 at a constant linear speed.
Generate a V drive signal. The rotational speed detection information (phase / frequency error information) of the spindle motor 2 is EFM-
The reproduction clock CK _EFM from the PLL circuit 12 or the groove clock CK _GV from the groove PLL circuit 13 is used. The EFM-PLL circuit 12 detects the edge of the EFM signal and injects it into the PLL loop to generate E
A reproduction clock CK _EFM synchronized with the FM signal is generated, that is, the reproduction clock CK _EFM has spindle rotation speed information. Further, since the EFM signal is not extracted at the time of recording on the MD90, the clock synchronized with the spindle rotation is the groove information GV PL.
The groove clock CK _GV obtained by injecting into the L loop will be used.

The CLV drive signal generated by the servo circuit 8 is converted into, for example, a three-phase drive signal by the servo driver 9 and applied to the spindle motor 2 via the switching unit 28 to control the rotation speed of the spindle motor 2. That is, the CLV of the spindle motor 1 that rotationally drives the MD 90.
Servo system works.

The EFM encoder / decoder 11 is an MD
The encoding / decoding is performed for 8-14 modulation, which is the modulation method adopted in the system and the CD system, and the decoding process for the reproduced EFM signal and the EFM encoding process for the signal to be recorded in the MD 90 are executed. The EFM encoder / decoder 11 functions as a decoder during reproduction, decodes the EFM signal input from the RF amplifier 5, and supplies the EFM signal to the ECC encoder / decoder 16. Further, at the time of reproduction, the subcode decoder 14 extracts the address and other subcode information from the EFM decoded data. A reproduction clock CK _EFM generated by the EFM-PLL circuit 12 is used as the reference clock for the decoding process.

During recording on the MD 90, the EFM encoder / decoder 11 functions as an encoder and supplies encoded data (EFM signal) to the magnetic head driver 7. In this case, the magnetic head driver 7 is EF
The magnetic head 6 applies N / S magnetic field in response to the M signal pulse. Since the EFM data is not read at the time of recording and therefore the address information and the like by the subcode decoder 14 are not read, the address information extracted from the groove information GV by the groove decoder 15 is used for operation control. A predetermined master clock is used as the reference clock for the encoding process.

The ECC encoder / decoder 16 is an MD
The encoding / decoding is performed with respect to the error correction method (CIRC method) adopted in the system and the CD system. The ECC encoder / decoder 16 functions as a decoder during playback, and the EFM encoder / decoder
Error correction processing is performed on the data input from the decoder 11. Further, the ECC encoder / decoder 16 functions as an encoder during recording, and adds an error correction code to the data input from the sector encoder / decoder 17.

The sector encoder / decoder 17 has M
It performs encoding / decoding regarding the sector format adopted in the D system. The sector encoder / decoder 17 functions as a decoder during reproduction of the MD 90, and the ECC encoder / decoder 1
Sector decoding processing is performed on the data input from 6. The sector-decoded data is temporarily written in the buffer memory 20 under the control of the memory controller 18. The sector encoder / decoder 17 also functions as an encoder during recording, and performs sector encoding processing on the data read from the buffer memory 20.

The voice compression encoder / decoder 19 is M
Encoding (compression) / decoding (decompression) relating to the audio compression method adopted in the D system. The audio compression encoder / decoder 19 functions as a decoder during reproduction of the MD 90, and the buffer memory 20.
The data read from is subjected to audio compression decoding (decompression processing for audio compression) to demodulate digital audio data of 16-bit quantization and 44.1 KHz sampling form. The demodulated digital audio data is converted into an analog audio signal by the D / A converter 23 via the multiplexer 22 and output from the output terminal 24 as a reproduced audio signal.

When recording on the MD 90, the audio compression encoder / decoder 19 functions as an encoder. That is, the analog audio signal input from the input terminal 25 is quantized by the A / D converter 26 in 16 bits,
4.1KHz sampling format digital audio data, audio compression encoder / multiplexer via multiplexer 27
When supplied to the decoder 19, the audio compression encoder / decoder 19 performs a compression process on the data so that the data amount is about ⅕. The compressed data is temporarily stored in the buffer memory 20 under the control of the memory controller 18.
Is written to.

The buffer memory 20 composed of, for example, a D-RAM is for realizing a so-called shock proof function at the time of MD recording / reproducing. In the case of this example, which will be described later in detail, shock proof at the time of reproducing a CD. It is used for realizing a function and further for a CD-MD dubbing operation. In particular, during the CD-MD dubbing operation, the storage area is divided into area A and area B as shown in the figure, and is individually used for a predetermined storage operation. In this example, one D-RAM is divided into the area A and the area B for use, but, for example, two memory ICs may be used.

A CD (compact disc) 91 loaded in a CD reproduction drive system is used as a reproduction-only medium in which audio data is recorded in advance in the form of embossed pits. In the CD format, the above-mentioned audio compression encoding and sector encoding are not adopted, and digital audio data of 16-bit quantization and 44.1KHz sampling format is ECC encoded and EFM.
Data in encoded format is recorded.

The CD 91 is rotationally driven at a constant linear velocity (CLV) by the spindle motor 31 during the CD reproducing operation. Then, the optical head 32 reads the data recorded in the pit form on the CD 91. In the optical head 32, the objective lens 32a is held by the biaxial mechanism 33 and can be displaced in the tracking and focusing directions. Further, the optical head 32 is the thread mechanism 3
4 allows the CD 91 to move in the radial direction.

During reproduction of the CD, the multiplexer 10 selects the optical head 32 side, and therefore the information read by the optical head 32 is supplied to the RF amplifier 5. In the RF amplifier 5, as in the above MD reproduction,
In addition to the reproduction RF signal, a focus error signal FE and a tracking error signal TE are generated and these error signals are supplied to the servo circuit 8. As in the case of MD reproduction, the servo circuit 8 also uses the focus error signal FE, the tracking error signal TE, the reproduction clock CK _EFM, etc. to drive the focus drive signal, the tracking drive signal,
Various drive signals such as a sled drive signal and a spindle drive signal are generated and supplied to the servo driver 37.

The switching unit 28 outputs the output of the servo driver 9 during reproduction of the CD to the spindle motor 31, the biaxial mechanism 33,
The switching is controlled so that it is output to the sled mechanism 34. Therefore, the servo driver 9 applies power based on the focus drive signal to the focus coil of the biaxial mechanism 33, and applies power based on the tracking drive signal to the tracking coil of the biaxial mechanism 33. Further, the sled mechanism 34 is driven based on the sled drive signal, and the spindle motor 31 is driven based on the spindle drive signal.

That is, when reproducing a CD, the optical head 32,
The RF amplifier 5, the EFM-PLL circuit 12, the servo circuit 8, the servo driver 9, the spindle motor 31, the sled mechanism 34, and the biaxial mechanism 33 constitute a focus control system, a tracking control system, a sled control system, and a CLV control system. By the way, RF amplifier 5, EFM-PLL circuit 1
2. The operations of the servo circuit 8 and the servo driver 9 are shared with the case of executing the servo operation at the time of driving the MD 90 described above. However, since the servo characteristics are different between the case of supporting the MD90 and the case of supporting the CD91, the processing in the servo circuit 8 is performed by switching the coefficient value as a mode change. Specifically, focus gain, tracking gain, CLV gain values,
Focus bias value, traverse adjustment value, laser power, etc. are changed.

The RF amplifier 5 reproduces RF from the CD 91.
The signal is binarized to form an EFM signal, which is supplied to the EFM encoder / decoder 11. Also, a reproduction clock CK synchronized with the reproduction of data from the CD 91.
_{The EFM} is generated by the EFM-PLL circuit 12.

When playing a CD, the EFM encoder /
The decoder 11 functions as an EFM decoder, and further E
The CC encoder / decoder 16 functions as an ECC decoder. Then, the data read from the CD 91 by the ECC decoder processing in the ECC encoder / decoder 16 is demodulated into a digital audio data form of 16-bit quantization and 44.1 KHz sampling. The digital audio data is converted into an analog audio signal by the D / A converter 23 via the buffer memory 20 and the multiplexer 22 and output from the output terminal 24. In addition, the TO when playing the CD91
The subcode decoder 14 also serves to extract control data such as C and subcode.

The system controller 21 is formed by a microcomputer, and controls each unit to execute necessary operations for the MD reproducing operation, MD recording operation, CD reproducing operation, and CD-MD dubbing operation. That is, the system controller 21 controls the servo circuit 8 and the switching unit 28 to cause the MD recording / reproducing drive system (optical head 2 or the like) to perform a required operation, and the CD reproducing drive system (optical head 32 or the like). The operation of is executed.

Further, the EFM encoder / echoda 11, E
CC encoder / Echoda 16, sector encoder /
The encoder / decoder 19 is instructed to perform encoding / decoding processing on the echoda 17 and the audio compression encoder / echoder 19. It also gives an instruction for selecting an input signal to be output in the multiplexers 10, 22, 27. Further, writing / writing of the buffer memory 20 to / from the memory controller 18
Instructions such as reading, address generation, and area setting are performed. Further, address information on the disc and other control information for using the system controller 21 for these controls are obtained from the subcode decoder 14 and the groove decoder 15.

The operation unit 29 is provided with a recording key, a reproduction key, a stop key, an AMS key, a search key, and the like so that the user can operate them, so that the reproducing / recording operation for the MD 90 and the CD 91 can be performed. Has been That is, the operation information from the operation unit 29 is supplied to the system controller 21, and the system controller 21 causes each of the above units to perform a required operation based on the operation information and the operation program.

Further, the display section 30 carries out a required display operation when the MD 90 and the CD 91 are reproduced or recorded. For example, the time information such as the total playing time, the progress time at the time of reproduction or recording, and various displays such as the track number, the operation state, and the operation mode are displayed under the control of the system controller 21.

For the sake of explanation, the multiplexer 27 is provided as a means for selecting a signal to be encoded by the audio compression encoder / echoder 19, but the audio compression encoder / echoder 19 can selectively process a plurality of inputs (that is, If it has a multiplexer function),
It goes without saying that it is not necessary to provide the multiplexer 27 as an independent block.

In the composite device of this example configured as described above, the MD reproduction operation, MD recording operation, CD reproduction operation, CD
-MD dubbing operation can be executed, but
Each operation will be described.

2. Operation During MD Playback The control operation of the system controller 21 during the MD playback operation is shown in FIG. That is, the system controller 2
In No. 1, the servo circuit 8 is set to the MD compatible mode in order to cause the MD recording / reproducing drive system to execute the reproducing operation of the MD 90, and the necessary servo operation execution control is performed. The switching unit 28 selects the MD recording / reproducing drive system side. The reproducing operation of the MD 90 by the MD recording / reproducing drive system is an operation of intermittently executing high-speed data reading according to the amount of data accumulated in the buffer memory 20.

Further, the system controller 21 causes the multiplexer 10 to supply the output of the optical head 2 to the RF amplifier 5. Further, the operation modes of the EFM encoder / echoder 11, the ECC encoder / decoder 16, the sector encoder / decoder 17, and the audio compression encoder / decoder 19 are controlled so as to execute the decoding processing. Further, to the multiplexer 22, the output uncompressed by the audio compression encoder / decoder 19 is converted into the D / A converter 23.
To be supplied to.

In this case, the buffer memory 20 is not divided into areas A and B as shown in FIG. An audio compression encoder / decoder 19 for writing the data sector-decoded by the sector encoder / decoder 17 to the memory controller 18 and for reading the data read from the buffer memory 20.
The supply operation to. At this time, the operation of writing the sector-decoded data to the buffer memory 20 is an intermittent operation at a high speed, while the buffer memory 2
The data reading from 0 and the supply operation to the audio compression encoder / decoder 19 are continuous operations at the normal rate.

The MD reproducing operation executed by such control is as follows. The CLV rotation operation of the spindle motor 1 and the focus / tracking servo system are turned on by a start command from the system controller 21 to the servo circuit 8, and data reading by the optical head 2 is started.

By this reproducing operation, the information detected from the MD 90 by the optical head 2 is supplied to the RF amplifier 5. Then, the reproduction RF signal is extracted by the RF amplifier 5,
The EFM signal obtained by further binarization is the EFM encoder / decoder 11, E in the decoding mode.
CC encoder / decoder 16, sector encoder /
After being decoded by the decoder 17, they are once written in the buffer memory 20 by the memory controller 18. The optical head 2 reads data from the MD 90, and the optical head 2 reads data from the buffer memory 20.
The transfer of playback data in the system up to 1.41 Mbit / sec,
Moreover, it is performed intermittently.

The data written in the buffer memory 20 is read out at the timing when the reproduction data is transferred at 0.3 Mbit / sec, and is supplied to the audio compression encoder / decoder 19 in the decoding mode. Then, reproduction signal processing such as decoding processing with respect to audio compression processing is performed, and 16-bit quantization and 44.1 kHz sampling audio data are supplied to the multiplexer 22. As described above, the multiplexer 22 selects the output of the audio compression encoder / decoder 19 during the reproduction operation of the MD 90. Therefore, the digital audio signal output from the audio compression encoder / decoder 19 is converted into an analog signal by the D / A converter 23. And output as a reproduced audio signal from the output terminal 24.

The writing / reading of data to / from the buffer memory 20 is performed by being addressed by the memory controller 18 under the control of the write pointer and the read pointer. The pointer (write address) is incremented at the timing of 1.41 Mbit / sec, while the read pointer (read address) is incremented at the timing of 0.3 Mbit / sec. Due to the difference between the bit rates of writing and reading, a certain amount of data is stored in the buffer memory 20. When the full capacity of data is accumulated in the buffer memory 20, the increment of the write pointer is stopped, and the data read operation from the MD 90 by the optical head 2 is also stopped. However, since the read pointer is continuously incremented, the reproduced audio output is not interrupted.

Thereafter, only the read operation is continued from the buffer memory 20, and at some point the buffer memory 20
If the amount of data stored therein is less than or equal to the predetermined amount, the data reading operation and the increment of the write pointer by the optical head 2 are restarted again, and the data is again stored in the buffer memory 20.

By outputting the reproduced voice signal via the buffer memory 20 in this way, even if the tracking is missed due to a disturbance or the like, the reproduced voice output is not interrupted and the data accumulation remains. By accessing to the correct tracking position and restarting the data reading while the operation is in progress, the operation can be continued without affecting the reproduction output. That is, the vibration resistance function (shock proof function) can be significantly improved.

3. Operation during MD recording The control operation of the system controller 21 during the MD recording operation is as shown in FIG. System controller 2
In No. 1, the servo circuit 8 is set to the MD compatible mode in order to cause the MD recording / reproducing drive system to execute the recording operation to the MD 90, and the necessary servo operation execution control is performed. The switching unit 28 selects the MD recording / reproducing drive system side. The recording operation to the MD 90 is an operation in which high-speed data writing is intermittently performed (every time a predetermined amount of data is stored) according to the amount of data stored in the buffer memory 20.

Further, the system controller 21 causes the multiplexer 10 to supply the output of the optical head 2 to the RF amplifier 5 so that the address information and the like based on the groove information GV can be obtained from the groove decoder 14. Also, EFM encoder / decoder 11, EC
The operation mode of each of the C encoder / decoder 16, the sector encoder / decoder 17, and the audio compression encoder / decoder 19 is controlled so as to execute the encoding process.

Further, for the multiplexer 27 for selecting the data to be audio-compressed and encoded, the audio data input from the input terminal 25 and digitized by the A / D converter 26 is selected and supplied to the audio-compression encoder / decoder 19. I will let you. In this case also, the buffer memory 20
2), the division setting of area A and area B as shown in FIG. 1 is not performed. And the memory controller 18
In response to this, an instruction to write the data compressed and encoded by the audio compression encoder / decoder 19 and to supply the data read from the buffer memory 20 to the sector encoder / decoder 17 is issued.

At this time, the operation of writing the audio compression-encoded data into the buffer memory 20 is a continuous operation at the normal rate, that is, the audio signal input to the input terminal 25 is audio-compressed at the same timing and buffered. Write to the memory 20. On the other hand, the data read from the buffer memory 20 and the sector encoder / decoder 17
The supply operation to the buffer memory 20 is performed intermittently at a high rate every time the data storage amount in the buffer memory 20 reaches a predetermined amount.

The MD recording operation executed by such control is as follows. The CLV rotation operation of the spindle motor 1 and the focus / tracking servo system are turned on by the start command from the system controller 21 to the servo circuit 8, and the laser irradiation of the recording level by the optical head 2 is started. Further, at the time of recording, by the groove information GV read from the optical head 2,
The groove decoder 15 obtains the address on the disc.

When the recording operation is performed on the MD 90, the recording signal (analog audio signal) supplied to the input terminal 25 is digitalized by the A / D converter 26 with 16-bit quantization and 44.1 KHz sampling. After being converted into data, it is supplied to the audio compression encoder / decoder 19 via the multiplexer 27, and subjected to audio compression encoding processing for compressing the data amount to about ⅕. The recording data compressed by the audio compression encoder / decoder 19 is temporarily buffered by the memory controller 18 in the buffer memory 2
It is written to 0, read at a predetermined timing, and sent to the sector encoder / decoder 17.

As for the operation in the buffer memory 20, the write pointer (write address) is opposite to that at the time of reproduction.
By incrementing at the timing of 0.3 Mbit / sec, the input voice data can be used as the buffer memory 2 at any time.
It will be written to 0. Then, when a certain amount of data is accumulated in the buffer memory 20, the read pointer is incremented at a timing of 1.41 Mbit / sec and the accumulated data is read and sent to the encoder / decoder unit 8. To be Therefore, the data supply to the sector encoder / decoder 17 (that is, the writing operation to the MD 90 by the magnetic head 6a described below) is
It is performed intermittently according to the amount of storage in the buffer memory 20.

Sector encoder / decoder 17, EC
The C encoder / decoder 16 and the EFM encoder / decoder 11 are in the encoding mode, respectively, and the data read from the buffer memory 20 is subjected to encoding processing such as sector encoding, CIRC encoding, and EFM modulation, and the data (EFM Signal) is
It is supplied to the magnetic head driver 7.

The magnetic head driver 7 is responsive to the recording data (EFM signal) which has been subjected to the encoding process.
And a magnetic head drive signal is supplied to. That is, the magnetic head 6 applies the magnetic field of N or S to the MD 90.

4. Operation During CD Playback FIG. 4 shows the control operation of the system controller 21 during the CD playback operation. The system controller 21
In order to execute the reproduction operation of the CD 91 with respect to the CD reproduction drive system, the servo circuit 8 is set to the CD corresponding mode and the execution control of the necessary servo operation is performed. Switching unit 2
8 selects the CD reproduction drive system side. The reproduction operation of the CD 91 is a normal-rate continuous reproduction drive, or, as the operation of the servo circuit 8, as shown in parentheses, high-speed data reading is performed in the buffer memory 20.
The operation may be intermittently executed according to the data storage amount.

Further, the system controller 21 causes the multiplexer 10 to supply the output of the optical head 32 to the RF amplifier 35. In addition, the EFM encoder / echoda 11, the ECC encoder / decoder 16
For each of the above, the operation mode is controlled so that the decoding process is executed. The sector encoder / decoder 17 and the audio compression encoder / decoder 19 are not used during CD reproduction. Further multiplexer 22
For this, the data read from the buffer memory 20 is supplied to the D / A converter 23.

In this case also, the buffer memory 20 is not divided into areas A and B as shown in FIG. Then, the memory controller 18 is instructed to write the data CIRC decoded by the ECC encoder / decoder 16 and to supply the data read from the buffer memory 20 to the D / A converter 23 via the multiplexer 22. . The optical head 3
When the normal rate continuous reproduction drive is performed by 2, the writing / reading to and from the buffer memory 20 is continuously performed at the normal rate, but the optical head 32 performs the high speed intermittent reproduction drive. In such a case, the operation of writing the CIRC decoded data to the buffer memory 20 is an intermittent operation at a high speed, while the data is read from the buffer memory 20 and supplied to the D / A converter 23. The operation is a continuous operation at a normal rate.

The CD reproducing operation executed by such control is as follows. The CLV rotation operation of the spindle motor 31 and the focus / tracking servo system are turned on by the activation command from the system controller 21 to the servo circuit 8, and the data reading by the optical head 32 is started.

By this reproducing operation, the information detected from the CD 91 by the optical head 32 is supplied to the RF amplifier 5. Then, the reproduction RF signal is extracted by the RF amplifier 5 and further binarized to obtain an EFM signal, which is an EFM encoder / decoder 1 in a decoding mode.
1. The data is decoded by the ECC encoder / decoder 16, converted into digital audio data of 16-bit quantization and 44.1 KHz sampling, and then temporarily written in the buffer memory 20 by the memory controller 18.
The subcode decoder 14 extracts control data such as TOC and subcode, which are supplied to the system controller 21 and used for various controls.

The data written in the buffer memory 20 is read out at the timing at which the reproduction data is transferred at the normal rate and supplied to the multiplexer 22. As described above, the multiplexer 22 selects the read data of the buffer memory 20 during the reproduction operation of the CD 91.
The digital audio signal from the buffer memory 20 is converted into an analog signal by the D / A converter 23 and output from the output terminal 24 as a reproduced audio signal.

Even during such a CD reproducing operation, the CD 91
The audio data read from the memory controller 1 is once written to the buffer memory 20. In this case as well, writing / reading of data to / from the buffer memory 20 is performed by the memory controller 1.
2 is addressed and controlled by the control of the write pointer and the read pointer.

As described above, the CD by the optical head 32 or the like
The reproducing operation may be continuously performed at the normal rate, but may be intermittently performed at the high rate. When performing intermittently at a high speed, the read operation from the CD 30, the data transfer, and the increment of the write pointer (write address) are executed at the high speed. For example, the spindle motor 31 is rotated at double speed and the data transfer rate is 2.8 Mbit / sec. On the other hand, when the read pointer (read address) is incremented at the normal rate (1.4 Mbit / sec), voice output is normally performed, but the buffer memory 20 always stores a certain amount of data. In this state, that is, in the reproducing operation of the CD 91, the high vibration resistance function can be realized as in the reproducing operation of the MD 90.

5. Operation during CD-MD dubbing The control operation of the system controller 21 during dubbing from the CD 91 to the MD 90 is shown in FIG. The system controller 21 causes the servo circuit 8 to perform a servo drive operation for causing the CD reproduction drive system to perform an intermittent data read operation at a high speed of the CD 91, and an MD recording and reproduction drive system to the MD 90. The servo drive operation for executing the intermittent data recording operation at the high speed is alternately switched and executed in a time division manner.

The switching section 28 switches between the CD reproducing drive system side and the MD recording / reproducing drive system side in accordance with the operation switching of the servo circuit 8. That is, the reproduction drive of the CD 91 and the recording drive of the MD 90 are performed at different timings, so that each drive operation becomes intermittent. Further, regarding the multiplexer 10, the output of the optical head 32 is supplied to the RF amplifier 5 during the reproduction drive execution time of the CD 91, and the output of the optical head 2 is supplied to the RF amplifier 5 during the recording drive execution time of the MD 90.

Further, the EFM encoder / decoder 11,
For each of the ECC encoder / decoder 16, the operation mode is controlled so that the encoding process and the decoding process are switched and executed depending on the timing. For the sector encoder / decoder 17,
The encoding process and the operation off are switched according to the timing. Further, the audio compression encoder / decoder 19 is always operated in the encode mode.

Both the multiplexer 22 for selecting the data to be output as audio and the multiplexer 27 for selecting the data to be audio compression-encoded are made to select the data read from the area A of the buffer memory 20.

In the case of this dubbing operation, the buffer memory 20 is divided into areas A and B as shown in FIG. And for area A,
The ECC encoder / decoder 16 executes intermittent high-speed writing of CIRC-decoded data and continuous normal-rate reading of written data.
In the area B, the audio compression encoder / decoder 19 performs continuous writing of audio compression-encoded data at a normal rate and reading at a high rate each time the accumulated amount of written data reaches a predetermined amount. Let

CD-executed under such control
The MD dubbing operation is as follows. The switching timing of each control operation is shown in FIG. 6, and the dubbing operation will be described in conjunction with this.

It is assumed that the dubbing operation is started at time t0 in FIG. From this point of time, first, as shown in FIGS. 6K and 6L, the operation in the CD mode by the servo circuit 8 and the selection control of the CD reproducing drive system of the switching unit 28 are performed, and the multiplexer 10 controls the optical head 32. By supplying the output of the
A playback drive servo system is built. And FIG. 6 (a)
As shown in FIG.
Data reading from the CD 91 is started by the CD reproduction drive system such as. In this operation, the rotation speed of the spindle motor 31 is rotated at high speed, that is, data reading at high speed is performed.

The EFM signal extracted by the RF amplifier 5 from the information detected from the CD 91 by the optical head 32 is an EFM encoder / decoder in the decode mode during this period as shown in FIGS. 6 (b) and 6 (c). 11,
Each is decoded by the ECC encoder / decoder 16 to be a digital audio data form of 16-bit quantization and 44.1 KHz sampling. Further FIG.
(E) As shown in the upper part, the decoded digital audio data is written in the area A of the buffer memory 20 at a high rate.

The data written in the area A of the buffer memory 20 is continuously read at the timing when the reproduction data is transferred at the normal rate as shown in the lower part of FIG. Will be supplied to both. At this time, the multiplexer 22 selects the read data of the buffer memory 20, so that the buffer memory 20
The digital audio data read from is converted into an analog audio signal by the D / A converter 23, and is output from the output terminal 24 as monitor audio for dubbing operation as shown in FIG. 6 (f).

On the other hand, the read data (digital data of 16-bit quantization, 44.1 KHz sampling) from the buffer memory 20 is also supplied to the audio compression encoder / decoder 19 via the multiplexer 27, but the data shown in FIG. As described above, the audio compression encoder / decoder 19 is in the encoding mode, and the audio compression encoding process for compressing the data amount to about 1/5 is executed. The data compressed by the audio compression encoder / decoder 19 is shown in FIG.
(H) As shown in the upper part, the data is written in the area B of the buffer memory 20 at the timing of the normal rate (0.3 Mbit / sec).

The above operation is performed from the time point t0 when the dubbing is started, and the amount of data accumulated in the area B of the buffer memory 20 gradually increases as a result of this operation, as shown in FIG. 6 (i). . Here, at time t1,
It is assumed that the amount of data stored in area B has reached a predetermined amount (n clusters). The cluster corresponds to the data amount which is the minimum unit of the recording operation of the MD 90, and in this example, recording is performed in n cluster units.

At time t1 when the data storage amount becomes n clusters, the system controller 21 determines that the sector encoder / decoder 17, the ECC encoder / decoder 16,
Control is performed to set each of the EFM encoder / decoder 11 to the encode mode (FIGS. 6B and 6C).
(D)). Further, the reproducing operation of the CD reproducing drive system is stopped (FIG. 6 (a)), and the recording operation of the MD recording / reproducing drive system is started (FIG. 6 (j)). That is, FIG.
As shown in (k) and (l), the operation in the MD recording mode by the servo circuit 8 and the selection control of the MD recording / reproducing drive system of the switching unit 28 are performed, and the multiplexer 10 outputs the output of the optical head 2 to the RF amplifier 5. By being supplied, the MD recording drive servo system is constructed.

Then, as shown in FIGS. 6E to 6H, data read from the area A, monitor output by read data,
As shown in the lower part of FIG. 6 (h), the data from the area B is continuously recorded while the operations at the normal rate, that is, the audio compression encoding of the read data and the writing of the audio compression encoded data into the area B are continued. Start reading.
This data reading is performed at a high rate (eg 1.41 Mbit / sec).

The data read from the area B is sector-encoded by the sector encoder / decoder 17, the ECC encoder / decoder 16, and the EFM encoder / decoder 11, which are in the encoding mode, respectively.
Encoding processing such as CIRC encoding and EFM modulation is performed, and the data (EFM signal) is supplied to the magnetic head driver 7. The magnetic head driver 7 supplies a magnetic head drive signal to the magnetic head 6 in accordance with the encoded recording data (EFM signal), and causes the magnetic head 6 to apply an N or S magnetic field to the MD 90. The data read from the area B to the recording operation by the magnetic head 6 is performed at a high rate.

After this time t1, the buffer memory 20
As for area B, the normal rate writing is continued, but the high rate reading is performed.
The amount of accumulated data decreases as shown in FIG.

The MD recording operation started at time t1 is as follows:
For example, the process ends when the data recording for n clusters is completed. If this is the time t2, the same operation as the period from t0 to t1 is performed from the time t2. That is, the servo system is switched to the CD mode, the CD reproducing drive system performs the high-speed reproducing operation of the CD 91, and the EFM encoder / decoder 11 and the ECC encoder / decoder 16 are performed.
Are decoded and written in area A of the buffer memory 20.

Then, data reading from the area A, monitor output by the read data, voice compression encoding of the read data, writing of voice compression encoded data to the area B,
The operation performed at the normal rate is continued as it is, but the data read from the area B to the magnetic head 6 is continued.
The operation up to recording is not performed.

Further, by such an operation after the time point t2, the amount of data accumulated in the area B increases again.
When the accumulated amount reaches n clusters at the 3rd time point, the same operation as in the t1 to t2 period is executed after the 3rd time point. In the same way, the CD-M is executed by alternately performing such operations.
Dubbing of D is executed.

In the composite device of this example, MD reproduction, MD recording, CD reproduction, and CD-MD dubbing can be executed as described above, but in this example, a CD reproduction drive system such as the optical head 32 is used. Without providing a dedicated servo system and decoding system, the RF amplifier 5, the servo circuit 8, and the servo driver 9 perform servo control not only during MD recording / reproduction but also during CD reproduction, and also during the CD reproduction. Is E
The FM encoder / decoder 11 and the ECC encoder / decoder 16 are used.

Further, at the time of dubbing in which CD reproduction and MD recording are performed, the buffer function of the buffer memory 20 is used to reproduce the CD (periods t0 to t1 and t2 to t3 in FIG. 6).
Period) and MD recording period (t1 to t2 period and t3 to FIG. 6)
(t4 period), the CD reproduction and the MD recording are alternately performed at a high speed, and the RF amplifier 5, the servo circuit 8,
The operation of the servo driver 9 is time-divided into a CD reproduction compatible mode and an MD recording compatible mode. Furthermore, EFM encoder / decoder 11, ECC encoder / decoder 1
The operation of 6 is also time-divisionally set to the decode mode and the encode mode. This enables dubbing without providing a dedicated servo system and decoding system for the CD reproduction drive system.

From the above, in the composite device of this example, MD
The circuit scale can be greatly reduced while enabling reproduction, MD recording, CD reproduction, and CD-MD dubbing, and along with this, effects such as device miniaturization, cost reduction, and power consumption reduction can be obtained. You can Further, the number of ports of the microcomputer used as the system controller 21 can be reduced.

Further, in the case of this example, since audio is output through the buffer memory 20 even during CD reproduction,
As for the CD reproduction, the shock proof function can be exerted as in the case of the MD reproduction. Further, during the dubbing, the respective operations as the CD reproducing period and the MD recording period are alternately performed as described above, but the monitor audio output to the user is continuously performed as in the normal CD reproducing operation. It can also be used for listening to music while dubbing.

6. Second Configuration Example of CD / MD Combined Device Next, FIG. 7 shows a CD / MD which is a second configuration example of the embodiment.
3 shows a composite device. This CD / MD combined device is also equipped with an MD recording / reproducing drive system and a CD reproducing drive system, but not only shares the servo system and the encode / decode system as in the example of FIG. 1, but also shares the optical head 2. This further simplifies the configuration.

As a constitution for sharing the optical head 2, as shown in the drawing, the turntable on which the MD 90 is placed and the turntable on which the CD 91 is placed are arranged side by side in the same plane direction. Optical head 2
Is movable along the sled axis of the sled mechanism 4 between the position on the MD90 side indicated by the solid line in the figure and the position on the CD91 side indicated by the broken line.

MD90 or C depending on the optical head 2
The information detected from D91 is supplied to the RF amplifier 5,
The EFM signal, focus error signal FE, tracking error signal TE, etc. are extracted. The servo circuit 8 and the servo driver 9 drive the biaxial mechanism 3, the sled mechanism 4, and the spindle motors 1 and 31. However, as in the case of the example of FIG. Servo characteristics such as servo gain are switched between the case of recording and reproducing.

Further, the servo circuit 8 and the servo driver 9
Drives the sled mechanism 4 to start the CD reproduction, and moves the optical head 2 to the position on the CD 91 side, and drives the sled mechanism 4 to start the MD recording / reproduction. Then, the operation of moving the optical head 2 to the position on the MD90 side is performed. In FIG. 7, other configurations and operations are basically the same as those in FIG. 1, and therefore, the same portions will be denoted by the same reference numerals and description thereof will be omitted.

In the MD reproducing operation and the MD recording operation in this case, the optical head 2 is located at the MD side,
Also, it is almost the same as the example of FIG. 1 described above, except that the multiplexer 10 and the switching unit 28 in FIG. Also regarding the CD reproducing operation, the optical head 2 is set to the position on the CD side,
And, except that the operation control of the multiplexer 10 and the switching unit 28 in FIG. 1 is eliminated, it is almost the same as the example of FIG.

7. Operation during CD-MD dubbing in the second configuration example In the CD / MD composite device of FIG.
System controller 2 for dubbing to 90
The control operation of No. 1 is shown in FIG. System controller 21
Indicates to the servo circuit 8 a servo drive operation for causing the CD reproduction drive system (in this case, the optical head 2 and the spindle motor 31) to perform a high-speed data read operation of the CD 91, and MD recording / reproduction. The drive system (in this case, the optical head 2 and the spindle motor 1) is alternately switched between the servo drive operation for executing the high-speed data recording operation for the MD 90 and is executed in a time-division manner. When switching the operation of the servo circuit 8, movement control of the position of the optical head 2 between the MD side and the CD side is also performed. CD of course
The reproducing drive of 91 and the recording drive of the MD 90 are performed at different timings, so that each drive operation becomes intermittent.

Further, the system controller 21 is an EFM.
The operation mode of each of the encoder / decoder 11 and the ECC encoder / decoder 16 is controlled so that the encoding process and the decoding process are switched and executed depending on the timing. Sector encoder /
Regarding the decoder 17, the encoding process and the operation off are switched depending on the timing. Further, the audio compression encoder / decoder 19 is always operated in the encode mode.

Both the multiplexer 22 for selecting the data to be output as audio and the multiplexer 27 for selecting the data to be audio-compressed and encoded are made to select the data read from the area A of the buffer memory 20.

In the case of this dubbing operation, the buffer memory 20 is divided into areas A and B as shown in FIG. In the example of FIG. 7 as well, similar to the example of FIG. 1, division setting of area A and area B is not necessary for MD reproduction, MD recording, and CD reproduction.

Regarding the area A during the dubbing operation,
The ECC encoder / decoder 16 executes intermittent high-speed writing of CIRC-decoded data and continuous normal-rate reading of written data.
In the area B, the audio compression encoder / decoder 19 performs continuous writing of audio compression-encoded data at a normal rate and reading at a high rate each time the accumulated amount of written data reaches a predetermined amount. Let

The CD-executed under such control
The MD dubbing operation is as follows. The switching timing of each control operation is shown in FIG. 9, and the dubbing operation will be described in conjunction with this.

It is assumed that the dubbing operation is started at time t10 in FIG. Since the dubbing operation is first started from the CD reproduction, the sled mechanism 4 is driven to move the optical head 2 to the CD 91 side as shown in FIG.

When the movement of the optical head 2 is completed at time t11, from this time, the servo circuit 8 operates in the CD mode as shown in FIG. 9 (k), and the output of the optical head 2 is changed. By being supplied to the RF amplifier 5, a CD reproduction drive servo system is constructed. Then, as shown in FIG. 9A, the data reading from the CD 91 is started by the operation of the spindle motor 31 and the optical head 2. In this operation, the rotation speed of the spindle motor 31 is set to a high speed rotation (for example, double the normal speed), that is, data reading at a high speed is performed. The spindle servo is a servo operation using the EFM clock CK _EFM .

Then, the EFM signal extracted by the RF amplifier 5 from the information detected from the CD 91 by the optical head 2 is an EFM encoder / decoder in the decode mode during this period as shown in FIGS. 9 (b) and 9 (c). 11, E
Each is decoded by the CC encoder / decoder 16 to be a digital audio data format of 16-bit quantization and 44.1 KHz sampling. Furthermore, FIG.
(E) As shown in the upper part, the decoded digital audio data is written in the area A of the buffer memory 20 at a high rate.

The data written in the area A of the buffer memory 20 is read at the timing at which the reproduction data is transferred at the normal rate as shown in the lower part of FIG. 9 (e), and is supplied to both the multiplexers 22 and 27. . At this time, since the multiplexer 22 selects the read data of the buffer memory 20, the digital audio data read from the buffer memory 20 is converted into an analog audio signal by the D / A converter 23, as shown in FIG. 9 (f). The sound is output from the output terminal 24 as the monitor sound of the dubbing operation.

On the other hand, the read data (16-bit quantization, digital data of 44.1 KHz sampling) from the buffer memory 20 is also supplied to the audio compression encoder / decoder 19 via the multiplexer 27, as shown in FIG. As described above, the audio compression encoder / decoder 19 is in the encoding mode, and the audio compression encoding process for compressing the data amount to about 1/5 is executed. The data compressed by the audio compression encoder / decoder 19 is shown in FIG.
(H) As shown in the upper part, the data is written in the area B of the buffer memory 20 at the timing of the normal rate (0.3 Mbit / sec).

T1 at the start of the CD reproducing operation in dubbing
The operation as described above is performed from one point in time, but due to this operation, the data storage amount in the area B of the buffer memory 20 gradually increases as shown in FIG. 9 (i). Here, it is assumed that the data storage amount of area B reaches a predetermined amount (n clusters) at t12. Also in this example,
Recording is performed on the MD 90 in units of n clusters.

T12 when the data storage amount becomes n clusters
At this point, the system controller 21 controls the dubbing operation to switch from CD reproduction to MD recording. That is, the reproduction operation of the CD reproduction drive system is performed as shown in FIG.
Stop at 12 o'clock. Then, as shown in FIG. 9 (l), the sled mechanism 4 is driven to move the optical head 2 to the MD 90 side, so that the MD recording is possible.

When the movement of the optical head 2 is completed at time t13, the sector encoder / decoder 17, the ECC encoder / decoder 16, the EFM encoder / decoder 1
1 is set to the encode mode to start the operation (FIGS. 9B, 9C and 9D). Also MD
Start the recording operation of the recording / reproducing drive system (see FIG. 9).
(J)). That is, the MD recording drive servo system is constructed by supplying the output of the optical head 2 to the RF amplifier 5 by the operation in the MD recording mode by the servo circuit 8 as shown in FIG. Of course, in this case, the spindle servo is switched to the servo operation using the groove clock CK _GV , and the spindle motor 1 drives the MD.
90 CLV rotations are performed. The laser output level of the optical head 2 is switched to a high level for recording.

Then, as shown in FIGS. 9E to 9H, data reading from the area A, monitor output by the read data,
As shown in the lower part of FIG. 9 (h), the data from the area B is continuously recorded while the operations at the normal rate, that is, the audio compression encoding of the read data and the writing of the audio compression encoded data into the area B are continued. Start reading.
This data reading is performed at a high rate (eg 1.41 Mbit / sec).

The data read from the area B is sector-encoded by the sector encoder / decoder 17, the ECC encoder / decoder 16, and the EFM encoder / decoder 11 in the encoding mode, respectively.
Encoding processing such as CIRC encoding and EFM modulation is performed, and the data (EFM signal) is supplied to the magnetic head driver 7. The magnetic head driver 7 supplies a magnetic head drive signal to the magnetic head 6 in accordance with the encoded recording data (EFM signal), and causes the magnetic head 6 to apply an N or S magnetic field to the MD 90. The data read from the area B to the recording operation by the magnetic head 6 is performed at a high rate.

After time t13, the buffer memory 2
Regarding the area B of 0, the writing at the normal rate is continued, but the reading at the high rate is performed, so that the data storage amount decreases as shown in FIG. 9 (i).

The MD recording operation started from the time t13 is ended when the data recording for n clusters is completed, for example. If this is at time t14, t1
From the 4th time point, the CD reproducing operation is performed again. That is, t1
The optical head 2 is moved to the CD 91 side in the period 4 to t15 (FIG. 9 (l)), and the same operation as in the period t11 to t12 is performed from the time t15. That is, the servo system is switched to the CD mode, the high speed reproduction operation of the CD 91 is performed by the optical head 2 and the spindle motor 31, and the read data is the EFM encoder / decoder 11, EC.
The data is decoded by the C encoder / decoder 16 and written in the area A of the buffer memory 20.

Then, data reading from area A, monitor output by read data, voice compression encoding of read data, writing of voice compression encoded data to area B,
The operation performed at the normal rate is continued as it is, but the data read from the area B to the magnetic head 6 is continued.
The operation up to recording is not performed.

Further, although the amount of data accumulated in the area B is increased again by such an operation after the time t15,
When the accumulated amount reaches n clusters at time t16, the same operation as in the period t12 to t14 is executed after the time t16. That is, the optical head 2 is moved to the MD90 side, and the MD
The recording operation for 90 is performed. In the same manner, CD-MD dubbing is performed by alternately performing such operations.

In the composite device of this example, MD reproduction, MD recording, CD reproduction, and CD-MD dubbing can be executed as described above, but in this example, MD reproduction / recording, C
In each operation of D reproduction, the optical head 2 (and the biaxial mechanism 3, the sled mechanism 4), the RF amplifier 5, the servo circuit 8,
Servo driver 9, EFM encoder / decoder 11,
The ECC encoder / decoder 16 is shared.

Further, at the time of dubbing where CD reproduction and MD recording are performed, the buffer function of the buffer memory 20 is used to reproduce the CD (periods t11 to t12, t15 in FIG. 9).
~ T16 period) and MD recording period (t13 to t14 in FIG. 9)
Period, t17 to t18 period), the position of the optical head 2 is switched to alternately perform CD reproduction and MD recording at a high rate, and the operations of the RF amplifier 5, the servo circuit 8 and the servo driver 9 are time-divisionally performed. There are a CD playback compatible mode and an MD recording compatible mode. Furthermore, EFM encoder / decoder 11, ECC encoder / decoder 16
The operation of is also time-divisionally set to the decode mode and the encode mode. As a result, CD playback drive system and M
Dedicated optical head for each D recording / playback drive system,
Dubbing is possible without providing a servo system and a decoding system.

From the above, in the composite device of this example, MD
The circuit scale can be greatly reduced while enabling reproduction, MD recording, CD reproduction, and CD-MD dubbing, and the degree of simplification is greater than that in the example of FIG. As a result, the effects of downsizing the device, lowering the cost, and reducing the power consumption can be further promoted. Further, the effect of reducing the number of ports of the microcomputer serving as the system controller 21 and the processing load is also increased.

Further, in the case of this example, as in the case of the example of FIG. 1, the sound is output through the buffer memory 20 during the CD reproduction, so that the shock proof function is also provided for the CD reproduction as in the case of the MD reproduction. Can be demonstrated.
When dubbing, as described above, the CD reproduction period and M
Although each operation as the D recording period is alternately performed, the monitor audio output to the user is continuously performed as in the case of normal CD reproduction, so that the user can enjoy listening to music while dubbing. it can.

Further, in this example, compared to the example of FIG. 1, the optical head 2 is commonly used and the multiplexer 10 and the switching unit 28 associated therewith are not required. That is, the risk of deterioration of the noise margin due to the multiplexer 10) can be eliminated. Further, the single optical head 2 and the servo circuit 8 not only simplifies the manufacturing but also simplifies the adjustment process (that is, it is not necessary to adjust each of the two servo systems and the optical head). You can also get the effect.

8. Third Configuration Example of CD / MD Composite Device FIG. 10 shows a CD / MD composite device as a third configuration example of the embodiment. In this example, the area division of the buffer memory 20 is not performed, and other configurations are basically the same as those in FIG. 7, and therefore, the same portions will be denoted by the same reference numerals and description thereof will be omitted.

The MD reproducing operation and MD recording operation in this case are the same as those in the example of FIG. Regarding the CD reproduction operation, a reproduction signal is moved along the path of the optical head 2, the RF amplifier 5, the EFM encoder / decoder 11, the ECC encoder / decoder 16, the multiplexer 22, the D / A converter 23, and the output terminal 24 which are moved to the CD 91 side. Is output. In this example, the buffer memory 20 is not used,
Therefore, the signal transmission is performed at the normal rate.
However, also in this case, the output of the ECC encoder / decoder 16 is accumulated in the buffer memory 20 at a high rate,
It is also possible to realize the so-called shock proof function by supplying the data read at the normal rate to the D / A converter 23 and outputting it from the output terminal 24.

9. Operation during CD-MD dubbing in the third configuration example In the example of FIG. 10, the monitor output of the CD reproduced sound is not performed during the operation during CD-MD dubbing.

FIG. 11 shows the control operation of the system controller 21 when dubbing from the CD 91 to the MD 90. The system controller 21 causes the servo circuit 8 to perform a servo drive operation for causing the CD reproduction drive system (that is, the optical head 2 and the spindle motor 31) to perform a data read operation of the CD 91, and an MD recording / reproduction drive system. The servo drive operation (that is, the optical head 2 and the spindle motor 1) for executing the data recording operation for the MD 90 is alternately switched and executed in a time division manner.

When such operation switching of the servo circuit 8 is performed, movement control of the position of the optical head 2 between the MD side and the CD side is also performed. Of course CD91
And the recording drive of MD90 are performed at different timings, so that each drive operation is intermittent.

Each drive operation may be performed at a high rate or at a normal rate. Further, one may be the high rate and the other may be the normal rate. When the CD playback sound during dubbing recording is not monitored as in this example, there is no limitation on the operating speed in the playback operation / recording operation. However, it goes without saying that the dubbing operation can be completed quickly by performing each drive operation at a high speed, which is preferable.

Further, the system controller 21 is an EFM.
The operation mode of each of the encoder / echoda 11 and the ECC encoder / decoder 16 is controlled so that the encoding process and the decoding process are switched and executed depending on the timing.

Regarding the sector encoder / decoder 17, the encoding process and the operation off are switched according to the timing. Further audio compression encoder / decoder 19
With respect to, the data output from the ECC encoder / decoder 16 is supplied to the multiplexer 27 which switches the encoding process and the operation off at the timing opposite to that of the sector encoder / decoder 17 and selects the data to be subjected to the audio compression encoding. Select.

In the case of this dubbing operation, with respect to the buffer memory 20, division setting of area A and area B as in the example of FIG. 1 is not performed. And the buffer memory 20
In response to the above, the audio compression encoder / decoder 19 is caused to execute the writing of the audio compression-encoded data and the reading each time the accumulated amount of the written data reaches a predetermined amount.

The CD-executed under such control
The MD dubbing operation is as follows. The switching timing of each control operation is shown in FIG. 12, and the dubbing operation will be described together with this.

It is assumed that the dubbing operation is started at time t20 in FIG. Since the dubbing operation is first started from the CD reproduction, as shown in FIG.
Is driven, the optical head 2 is moved to the CD 91 side, and C
D The reproducible state is set.

When the movement of the optical head 2 is completed at time t21, the servo circuit 8 operates from this time in the CD mode as shown in FIG. 12 (i), and the output of the optical head 2 is RF amplifier. Is supplied to C,
A D reproduction drive servo system is built. And FIG.
As shown in (a), the data reading from the CD 91 is started by the operation of the spindle motor 31 and the optical head 2.

The EFM signal extracted by the RF amplifier 5 from the information detected from the CD 91 by the optical head 2 is an EFM encoder / decoder in the decode mode during this period as shown in FIGS. 11,
Each is decoded by the ECC encoder / decoder 16 to be a digital audio data form of 16-bit quantization and 44.1 KHz sampling.

The 16-bit quantized digital audio data of 44.1 KHz sampling is supplied to the audio compression encoder / decoder 19 through the multiplexer 27. As shown in FIG. Is in an encoding mode, and audio compression encoding processing for compressing the data amount to about 1/5 is executed. The data compressed by the audio compression encoder / decoder 19 is written in the buffer memory 20 as shown in FIG.

Since the above-described operation is performed from the time t21 when the CD reproduction is started, the data storage amount of the buffer memory 20 gradually increases as shown in FIG. 12 (g). Here, it is assumed that the data storage amount reaches a predetermined amount (n clusters) at time t22. Then, the system controller 21 controls to switch the dubbing operation from CD reproduction to MD recording. That is, as shown in FIG. 12A, the reproduction operation of the CD reproduction drive system is stopped at time t22. When the reproduction is stopped, the operation of the audio compression encoder / decoder 19 is also turned off (FIG. 12 (e)), and as shown in FIG. 12 (l), the sled mechanism 4 is driven to move the optical head 2 to M.
It is moved to the D90 side, and is set to the MD recordable state.

When the movement of the optical head 2 is completed at time t23, the system controller 21 causes the sector encoder / decoder 17, the ECC encoder / decoder 16,
The EFM encoder / decoder 11 is set to the encode mode to control the operation (FIG. 12).
(B) (c) (d)). Then, the recording operation of the MD recording / reproducing drive system is started (FIG. 12 (h)).

As an operation for MD recording from time t23, data is read from the buffer memory 20 as shown in FIG. The read data is the sector encoder / decoder 1 in the encode mode.
7. ECC encoder / decoder 16 and EFM encoder / decoder 11 respectively perform sector encoding and CI
Encoding processing called RC encoding and EFM modulation is performed, and the data (EFM signal) is supplied to the magnetic head driver 7. The magnetic head driver 7 supplies a magnetic head drive signal to the magnetic head 6 in accordance with the encoded recording data (EFM signal), and causes the magnetic head 6 to apply an N or S magnetic field to the MD 90.

After time t23, the buffer memory 2
As for 0, writing is not performed, but only reading is performed, so that the data storage amount decreases as shown in FIG. And M started from t23
The D recording operation is once terminated when the data recording for n clusters is completed and the accumulated amount becomes zero. This is t24
If it is the time point, the CD reproducing operation is performed again from the time point t24. That is, the optical head 2 is moved to the CD 91 side in the period from t24 to t25 (FIG. 12 (l)), t25
From the time point, the same operation as in the period from t21 to t22 is performed. That is, the reproduction operation of the CD 91 is performed by the operations of the optical head 2 and the spindle motor 31, and the EFM encoder / decoder 11 and the ECC encoder / decoder 16 are performed.
Decoding processing by audio compression encoder / decoder 19
The audio compression encoding and the audio compression encoding data writing to the buffer memory 20 are performed.

Further, due to such an operation after the time point t25, the data storage amount of the buffer memory 20 increases again. However, if the storage amount reaches n clusters at the time point t26, from the time point t26 to the t22 to t24 period. The same operation as is executed. In the same manner, CD-MD dubbing is performed by alternately performing such operations.

That is, in the composite device of this example, audio monitoring cannot be performed during CD-MD dubbing, but with the very simple circuit configuration similar to the example of FIG. 7, MD reproduction, MD recording, CD reproduction, and CD-MD dubbing are performed. Is made feasible. That is, similar to the example of FIG. 7, it is possible to obtain the effects of downsizing the device, reducing the cost, reducing the power consumption, and reducing the number of ports of the microcomputer serving as the system controller 21.

Further, in this example, since the area division of the buffer memory 20 is not performed, the memory control operation is also simplified. By the way, although audio monitoring cannot be performed during CD-MD dubbing, conversely, this means that CD playback / MD recording may be performed at any speed during dubbing. Therefore, for example, 4 × speed, 8 × speed, etc. By performing CD reproduction / MD recording at a high transfer rate, there is an advantage that the time required for dubbing can be shortened.

Although the embodiments of the present invention have been described above, the present invention can be realized as various composite devices. For example, it may be a composite device having an MD reproducing device unit and an MD recording device unit, or a composite device having a recording / reproducing device unit using a tape medium such as DAT.

[0157]

As described above, the composite device of the present invention selectively supplies servo drive signals to the first recording or reproducing head system and the second recording or reproducing head system, A first recording / reproducing head system and a second recording / reproducing head system, and a servo means capable of executing a recording / reproducing operation, that is, the first and second recording / reproducing head systems. About servo means to be shared. This reduces the number of parts and simplifies the circuit configuration while maintaining the operation function as a composite device, which leads to downsizing of the device, cost reduction, reduction of power consumption, and port of microcomputer. It is possible to obtain the effect of reducing the number and processing load.

Further, according to the present invention, the head is movably movable between the recording or reproducing operation position of the first recording medium and the recording or reproducing operation position of the second recording medium of the same kind as or different from the first recording medium. A mechanism is formed so that the head mechanism and the servo means are commonly used for the recording or reproducing operation for the first recording medium and the recording or reproducing operation for the second recording medium. As a result, the effects of reducing the number of parts and simplifying the circuit configuration can be further promoted, and the effects of downsizing, cost reduction, low power consumption, and reduction of processing load can be made more prominent. . Furthermore, by sharing the head mechanism, it is not necessary to switch to the signal path at the RF signal stage, and the fear of noise margin deterioration can be eliminated. In addition, the single head mechanism and servo mechanism also simplifies the adjustment process.

[Brief description of drawings]

FIG. 1 is a block diagram of a composite device according to a first embodiment of this invention.

FIG. 2 is an explanatory diagram of control during MD reproduction of the composite device according to the first embodiment.

FIG. 3 is an explanatory diagram of control during MD recording of the composite device according to the first embodiment.

FIG. 4 is an explanatory diagram of control during CD reproduction of the composite device according to the first embodiment.

FIG. 5 is an explanatory diagram of control during CD-MD dubbing of the composite device according to the first embodiment.

FIG. 6 is an explanatory diagram of control switching timing at the time of CD-MD dubbing of the composite device according to the first embodiment.

FIG. 7 is a block diagram of a composite device according to a second embodiment of this invention.

FIG. 8 is an explanatory diagram of control during CD-MD dubbing of the composite device according to the second embodiment.

FIG. 9 is an explanatory diagram of control switching timing at the time of CD-MD dubbing of the composite device of the second embodiment.

FIG. 10 is a block diagram of a composite device according to a third embodiment of this invention.

FIG. 11 is an explanatory diagram of control during CD-MD dubbing of the composite device according to the third embodiment.

FIG. 12 is an explanatory diagram of control switching timing at the time of CD-MD dubbing of the composite device of the third embodiment.

FIG. 13 is a block diagram of a conventional composite device.

[Explanation of symbols]

1,31 Spindle motor, 2,32 Optical head,
3,33 2-axis mechanism, 4,34 thread mechanism, 5 R
F amplifier, 6 magnetic heads, 7 magnetic head drivers,
8 servo circuits, 9 servo drivers, 10, 22, 2
7 multiplexer, 11 EFM encoder / decoder, 12 EFM-PLL circuit, 13 groove PLL circuit, 14 subcode decoder, 15 groove decoder, 16 ECC encoder / decoder, 17 sector encoder / decoder, 18 memory controller, 1
9 audio compression encoder / decoder, 20 buffer memory, 21 system controller, 23 D / A converter, 24 output terminal, 25 input terminal, 26 A / D converter, 28 switching section, 29 operation section, 30 display section, 9
0 MD, 91 CD

Claims (2)

[Claims] 1. A first recording or reproducing head system for executing a data recording or reproducing operation on a first recording medium, and a second recording medium of the same type or a different type from the first recording medium. Second for executing data recording or reproducing operation
Of the first recording or reproducing head system, and selectively supplying a servo drive signal to the first recording or reproducing head system and the second recording or reproducing head system. System and servo means capable of selecting one of the second recording / reproducing head system and executing recording / reproducing operation. 2. A head formed so as to be movable between a recording or reproducing operation position of a first recording medium and a recording or reproducing operation position of a second recording medium of the same type as or different from the first recording medium. Mechanism and, when the head mechanism is at the recording or reproducing operation position of the first recording medium, supplies a servo drive signal corresponding to the recording or reproducing operation of the first recording medium to the head mechanism. The recording or reproducing operation of the first recording medium can be executed, and when the head mechanism is at the recording or reproducing operation position of the second recording medium, the second recording medium with respect to the head mechanism. And a servo means capable of supplying a servo drive signal corresponding to the recording or reproducing operation of the second recording medium to execute the recording or reproducing operation of the second recording medium. Vessel.