JPH08153384A - Recorder and reproducer - Google Patents

Abstract

PURPOSE: To perform multichannel recording and reproducing by synchronously driving plural digital recording and reproducing devices used for public at low cost. CONSTITUTION: One of plural minidisk recorders is acted as a master device 10M, and the remainder of the recorders are acted as slave devices 10A-10L, and a synchronizing signal SY having a low repeating frequency and reqired resolution for an edge is generated by the master device, and also synchronizing information Sadrs is generated by sampling a required accurate address ID generated based on absolute address information of a disk with the synchronizing signal. This synchronizing information and the synchronizing signal are transmitted to the slave devices by utilizing wire remote control terminals 13c and 13d, and in each slave device, an address ID of this device itself is sampled with synchronizing signal, and is compared with the synchronizing information from the master device to obtain error information, by which a recording/reproducing position of the disk is controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention is suitable for synchronous operation.
The present invention relates to a recording device and a reproducing device.

[0002]

2. Description of the Related Art Recently, a portable audio recording / reproducing apparatus using a small-sized magneto-optical disk (mini disk, MD) as a recording medium has been proposed by the present applicant and has been put on the market. This disc recording / reproducing device combines the advantages of compact cassettes such as "compact" and "recordable" with the advantages of compact discs (CD) such as "high sound quality" and "quick random access". Next-generation personal
Expected as audio. It should be noted that this disc recording / reproducing apparatus is also compatible with a reproduction-only optical disc in which audio data is recorded in the form of physical pits, similar to a CD. Further, in this disc recording / reproducing apparatus, as the data recording / modulating method, the EF is the same as the CD.
M (Eight Fourteen Modulation, 8-14 modulation) is used.

A spiral pre-groove (guide groove) is previously formed on a recordable magneto-optical disk for tracking control. This pre-groove is FM based on absolute address data over the entire circumference of the disc.
It is recorded after being modulated. Therefore, the pre-groove of the magneto-optical disk is based on the absolute address data,
Wobbling in the radial direction of the optical disc.

At the time of recording and reproducing of a recordable magneto-optical disk, a disk recording / reproducing apparatus detects a wobbling component from a so-called push-pull signal and rotates a spindle motor so that the wobbling component has a constant frequency. By the servo control, the disk is rotationally driven at a constant linear velocity. Further, by performing FM demodulation of the wobbling component, absolute address information over the entire circumference of the disc, so-called AD
IP (ADress In Pre-groobe) is obtained.

References: Maeda: "Mini Disc System", Journal of Television Society, Vol. 47, No. 6 (June 1993)
As described above, the digital recording / reproducing apparatus using a mini disk as a medium is capable of remote control in a wired manner for convenience of portable use.

That is, in FIG. 5, reference numeral 10 denotes a main body of the recording / reproducing apparatus for the mini disk 1, which is a C for system control.
The PU 11 is mounted and the power supply 12 is built-in.
Reference numeral 15 denotes a wired remote control device (commander), which is equipped with a control keyboard 16 and a CPU 17, and a liquid crystal display 18.

Each of the main bodies 10 of the recording / reproducing apparatus has one
Paired power supply terminals 13a and 13b and control terminals 13c and 13d
Although not shown, operation keys for recording, reproducing, fast-forwarding, rewinding, stopping, etc. are provided to directly control the operating state.

Then, the cord 19 of the commander 15 is connected to the terminals 13a to 13d of the main body 10 and the commander 15
Is supplied with power, a transmission line is formed between the CPUs 11 and 17 for exchanging control information.

The keyboard 16 of the commander 15 is the main body 1
In the remote control mode in which the operation keys for recording to stop and the like are provided and the cord 19 is connected to the terminals 13a to 13d of the main body 10, as in 0, when any key is operated, the corresponding control signal is output. From the CPU 17 on the commander 15 side,
Connection code 1 in parallel or serial data format
9 through the control terminal 10c and the CPU 1 on the main body 10 side
1 and the operation of the main body 10 including the drive of the disk 1 is controlled. The operating state of the main body 10 is C
The data is transferred from the PU 11 to the CPU 17 on the commander 15 side via the control terminal 13d and the connection cord 19 and displayed on the liquid crystal display 18.

[0010]

By the way, the digital recording / reproducing apparatus using the above-mentioned mini-disc as a medium is compatible with 2-channel stereo sound similarly to a general consumer audio recording / reproducing apparatus. The audio signals are synchronized in.

When performing digital recording / reproduction of multi-channel audio exceeding two channels, the audio signals must be synchronized between the channels. In this case, the audio signals are synchronized between the channels. It is difficult, and conventionally, a multi-track recorder or the like has been used in which tracks for the number of channels are simultaneously formed on one tape to perform recording and reproduction.

However, the multi-track tape recorder is a multi-channel dedicated machine, and is mainly for commercial use, and is not suitable for consumer use in terms of price, size and weight.

In order to solve such a problem, the applicant of the present application, in Japanese Patent Application No. 4-264318, connects the recording / reproducing apparatus capable of digitally recording / reproducing 2-channel stereo sound for the required number of channels. Therefore, a recording device and a reproducing device, which are relatively low in price and capable of digital recording and reproducing multi-channel audio, have already been proposed.

An example of the already proposed recording device and reproducing device will be described below with reference to FIGS. 6 to 9.

First, the structure and operation of a single magneto-optical disk recording / reproducing apparatus will be described with reference to FIG.

In FIG. 6, 1 is an optical disk,
In the case of this example, a rewritable magneto-optical disk having a magneto-optical recording film capable of recording / reproducing and erasing is used. The outer diameter of the disc 1 is, for example, 64 mm, and spiral recording tracks are formed on the disc 1 at a pitch of 1.6 μm, for example. The disc 1 is rotated at a constant linear velocity, for example 1.2 to 1.4 m / s. Then, the disc 1 has audio information as a digital signal, and
By being compressed and recorded, the target information is 1
It is possible to record and reproduce 30 Mbytes or more.

Further, a pregroove for controlling a light spot (for tracking control) is formed on the disk 1 in advance. Particularly, in the case of this example, a wobbling signal for tracking is added to this pregroove. The absolute address code is recorded in a superimposed manner. The disc 1 is housed in a disc cartridge 2 to prevent dust and scratches.

Further, on the disc 1, information about recorded audio data is recorded at the innermost track position. This is generally the TOC (Table
of content), which includes the number of recorded songs, information about the recording position of each song, and the playing time of each song.

[Recording System of Recording / Reproducing Device] The recording / reproducing device of FIG. 6 is devised so that the structure can be simplified as much as possible by using an IC. First, the time of recording on a magneto-optical disk will be described. During recording and reproduction, the mode switching signal R / P from the system control circuit 20 causes
The mode of each circuit unit is switched. The system control circuit 20 is connected with a plurality of operation keys K1 to Kn for recording and reproducing, and the operation mode is designated by operating the keys K.

2 through a pair of input terminals 21LT and 21RT
The analog audio signal of the channel is sampled by the A / D converter 22 at a sampling frequency of 44.1 kHz, and each sampling value is converted into a 16-bit digital signal. This 16-bit digital signal is supplied to the data compression circuit 23R, and in the case of this example, the input digital data is compressed to, for example, about 1/5. As a data compression method, for example, an ADPCM (Adaptive DeltaPulse Co
de Modulation) is used.

Further, for example, the input digital data is divided into a plurality of bands so that the higher the band is, the wider the bandwidth becomes, and a plurality of samples are provided for each of the divided bands (the number of samples is the same in each band. It is also possible to use a method in which a block of (good) is formed, orthogonal transformation is performed for each block in each band, coefficient data is obtained, and bits are assigned to each block based on this coefficient data. The data compression method in this case considers the human auditory perception characteristics to sound, and can perform data compression with high efficiency (see Japanese Patent Application No. 1-278207).

In this way, the digital data DA from the A / D converter 22 is processed by the compression circuit 23R to be about 1
The data is compressed to / 5, and this data is compressed d
a is transferred to the buffer memory 25 controlled by the memory control circuit 24. In the case of this example, the buffer memory 25 is a D-RAM having a capacity of 1 Mbit.

The memory control circuit 24 transfers the compressed data da from the buffer memory 25 at a transfer speed which is about 5 times the writing speed, unless a track jump that causes the recording position on the disk 1 to fly due to vibration during recording is performed. The data is sequentially read and the read data is read by the data encoding circuit 26.
Transfer to R.

When it is detected that a track jump has occurred during recording, the data transfer to the encoding circuit 26R is stopped and the compressed data da from the processing circuit 23R is stopped.
Is stored in the buffer memory 25. Then, when the recording position is corrected, control is performed to restart the data transfer from the buffer memory 25 to the encoding circuit 26R.

Whether or not a track jump has occurred can be detected by, for example, providing a vibrometer in the apparatus and detecting whether or not the magnitude of vibration is such that a track jump occurs. Further, as described above, the absolute address code is recorded on the disc 1 of this example so as to be superposed on the wobbling signal for tracking control when forming the pre-groove. Therefore, it is possible to read the absolute address code from the pregroove at the time of recording and detect the track jump from the decoded output. Alternatively, the OR of the vibrometer and the absolute address code may be taken to detect the track jump.
When a track jump occurs, the power of the laser light for magneto-optical recording is lowered or the power is set to zero.

The correction of the recording position when the track jump occurs can be performed by using the absolute address code. Further, as will be understood from the above, as the data capacity of the buffer memory 25 in this case, the compressed data da corresponding to the time from the occurrence of the track jump to the correct correction of the recording position can be accumulated. Minimum capacity required. In this example, the buffer memory 25 has a capacity of 1 Mbit as described above, and this capacity is selected with a margin so as to sufficiently satisfy the above conditions.

Further, in this case, the memory control circuit 24 is
During this recording, during normal operation, memory control is performed so that the amount of data stored in the buffer memory 25 is reduced as much as possible. For example, when the amount of data in the buffer memory 25 exceeds a predetermined amount, a predetermined amount of data, for example 32 sectors (1 sector is 1 CD-ROM
Only the data of the sector (about 2 Kbytes) is read from the buffer memory 25, and the memory control is performed so as to always secure the write space of a predetermined data amount or more.

The data encoding circuit 26R stores the compressed data da transferred from the buffer memory 25 in the CD-.
Encodes into sector data of ROM. In addition,
Data including audio data for 32 sectors is hereinafter referred to as a cluster.

The output data (data in cluster units) of the data encoding circuit 26R is supplied to the recording encoding circuit 27. In this recording encoding circuit 27,
Encode data for error detection and correction,
Modulation processing suitable for recording, such as EFM coding processing in this example, is performed. The code for error detection and correction is a CD in this example.
The CIRC (Cross Interleaved Reed Solomon Code) of which interleave is changed is used. Since the recorded data is intermittent data in cluster units, a plurality of sectors for cluster connection are added before and after the cluster of 32 sectors.

The encoded data from the recording encoding circuit 27 is supplied to the magnetic head 29 via the magnetic head drive circuit 28. The magnetic head drive circuit 28 drives the magnetic head 29 so as to apply a modulation magnetic field according to the recording data to the disk 1 (magneto-optical disk). The audio data supplied to the head 29 is in cluster units, and recording is performed intermittently.

The disk 1 is housed in the cartridge 2, but when loaded in the apparatus, the shutter plate is opened and the disk 1 is exposed from the shutter opening. The disk drive motor 30 is inserted in the spindle insertion opening.
The rotation shaft of M is inserted and connected, and the disk 1 is rotationally driven. In this case, the disk drive motor 30M is controlled by the servo control circuit 32, which will be described later, to have a linear velocity of 1.2 to 1.4 m.
The rotation speed is controlled so that the disk 1 is rotationally driven at / s.

The magnetic head 29 faces the disk 1 exposed from the shutter opening of the cartridge 2.
An optical head 30 is provided at a position facing the surface of the disk 1 opposite to the surface facing the magnetic head. The optical head 30 is composed of, for example, a laser light source such as a laser diode, a collimator lens, an objective lens, a polarization beam splitter, an optical component such as a cylindrical lens, and a photodetector. , Laser light with a constant power larger than that during reproduction is emitted. Data is recorded on the disk 1 by thermomagnetic recording by this light irradiation and the modulation magnetic field by the magnetic head 29. The magnetic head 29 and the optical head 30 are both configured to be movable in the radial direction of the disk 1.

During this recording, the optical head 3
The output of 0 is supplied to the absolute address decoding circuit 34 via the RF signal processing circuit 31, and the absolute address code from the pre-groove of the disc 1 is extracted and decoded. Then, the decoded absolute address information is supplied to the recording encoder circuit 27, inserted as absolute address information in the recording data, and recorded on the disc. The absolute address information from the absolute address decoding circuit 34 is
It is supplied to the system control circuit 20 and is used for recognition of the recording position and position control as described above.

Further, a signal from the RF signal processing circuit 31 is supplied to the servo control circuit 32, a control signal for the constant linear velocity servo of the motor 30M is formed from the signal from the pre-groove of the disk 1, and the motor 30M is driven. Speed controlled.

[Reproduction System of Recording / Reproduction Apparatus] The disk loaded in the apparatus is rotationally driven by the disk drive motor 30M. Then, in the same manner as during recording, the disk drive motor 30M is driven by the servo control circuit 32 by the signal from the pre-groove so that the disk 1 has the same speed as during recording, that is, the linear velocity of 1.2 to 1.4 m / s. Then, the rotation speed is controlled to be constant.

At the time of reproduction, the optical head 30 detects the reflected light of the laser beam applied to the target track to detect the focus error by, for example, the astigmatism method, or the tracking error by, for example, the push-pull method. At the same time, the difference in the polarization angle (Kerr rotation angle) of the reflected light from the target track is detected, and the reproduction RF signal is output.

The output of the optical head 30 is supplied to the RF signal processing circuit 31. The RF signal processing circuit 31 extracts the focus error signal and the tracking error signal from the output of the optical head 30 and supplies them to the servo control circuit 32, and also binarizes the reproduction signal and supplies it to the reproduction decoding circuit 33.

The servo control circuit 32 controls the focus of the optical system of the optical head 30 so that the focus error signal becomes zero, and also controls the optical system of the optical head 30 so that the tracking error signal becomes zero. Performs tracking control.

The RF signal processing circuit 31 also extracts the absolute address code from the pre-probe and supplies it to the absolute address decoding circuit 34. Then, in the system control circuit 20,
The absolute address information from the decoding circuit 34 is supplied,
The servo control circuit 32 is used to control the reproduction position of the optical head 30 in the radial direction of the disk. The system control circuit 20 can also use the address information in sector units extracted from the reproduced data to manage the position on the recording track scanned by the optical head 30.

During this reproduction, as will be described later, the disc 1
The compressed data read from is written in the buffer memory 25, read and expanded, but due to the difference in the transmission rate of both data, the data read by the optical head 30 from the disk 1 is stored in, for example, the buffer memory. The data is intermittently performed so that the data does not fall below a predetermined amount.

The data read from the disk 1 is R
It is supplied to the reproduction decoding circuit 33 via the F signal processing circuit 31. The reproduction decoding circuit 33 receives the binarized reproduction signal from the RF signal processing circuit 31, and performs a process corresponding to the recording encoding circuit 27, that is, an EFM decoding process.
Decoding processing and interpolation processing for error detection and correction are performed. The output data of the reproduction decoding circuit 33 is supplied to the data decoding circuit 26P.

This data decoding circuit 26P is a CD-
Data of the sector structure of the ROM is decoded into original data in a compressed state.

The output data of the data decoding circuit 26P is transferred to the buffer memory 25 controlled by the track jump memory control circuit 24 and written at a predetermined writing speed.

At the time of this reproduction, the memory control circuit 24 writes the compressed data from the data decoding circuit 26P unless a track jump in which the reproduction position jumps due to vibration or the like occurs during reproduction. The data is sequentially read at a transfer rate of about ⅕ times the speed, and the read data is transferred to the data expansion processing circuit 23P. In this case, the memory control circuit 24 controls writing / reading of the buffer memory 25 so that the amount of data stored in the buffer memory 25 does not fall below a predetermined value.

When it is detected that a track jump has occurred during reproduction, writing of data from the data decoding circuit 26P to the buffer memory 25 is stopped and only data transfer to the data expansion processing circuit 23P is performed. .
Then, when the reproduction position is corrected, control is performed to restart the data writing from the data decoding circuit 26P to the buffer memory 25.

Whether or not a track jump has occurred is detected by the method using a vibrometer and the absolute address code recorded by being superposed on the wobbling signal for tracking control in the pre-groove of the optical disk as in the case of recording. The method used (that is, the method using the decode output of the absolute address decoding circuit 34) or the method for detecting the track jump by taking the OR of the vibrometer and the absolute address code can be used. Furthermore, during this playback,
As described above, the absolute address information and the sector unit address information are extracted from the reproduced data, so that this can also be used.

As will be understood from the above, as the data capacity of the buffer memory 25 at the time of this reproduction, as is understood from the above, data corresponding to the time from the occurrence of the track jump to the correct correction of the reproduction position is set. The minimum storage capacity is always required. This is because if there is such a capacity, even if a track jump occurs, the buffer memory 25
This is because the data can be continuously transferred from the data decompression circuit 23P to the data decompression circuit 23P. The 1M bit as the capacity of the buffer memory 25 in this example is selected as a capacity having a margin so as to sufficiently satisfy the above condition.

Further, as described above, the memory control circuit 24 is as much as possible in the buffer memory 25 during normal operation.
In addition, memory control is performed so that predetermined data above the required minimum is stored. In this case, for example, when the data amount of the buffer memory 25 becomes equal to or less than a predetermined amount, the optical head 30 intermittently takes in the data from the disk 1 and writes the data from the data decoding circuit 26P. The memory control is performed so as to always secure a read space of a predetermined data amount or more.

In the data expansion processing circuit 23P, the ADPC
In contrast to the data compression processing at the time of recording, the M data is expanded about 5 times.

The digital audio data from the data expansion circuit 23P is supplied to the D / A converter 35, which outputs 2
The analog audio signal of the channel is restored and output from the pair of output terminals 36LT and 36RT.

[Timing Signal System of Recording / Reproducing Apparatus] Timings of various operations of the recording system and the reproducing system as described above are set with reference to various timing signals such as the above-mentioned sampling frequency signal. Timing signal generation circuit 40
Is provided with a reference signal generation circuit 41 configured to have a fixed frequency including a crystal oscillator, assuming the case of asynchronous operation. In this example, as will be described later, since the plurality of recording / reproducing devices are synchronously operated, the timing signal generating circuit 40
It also includes a synchronization signal generation circuit 42 including a PLL circuit. Then, a switch 43 for switching between the asynchronous mode and the synchronous mode is provided.

In the asynchronous mode, the switch 43
Is connected to the contact i side, and various timing signals from the reference signal generating circuit 41 are appropriately supplied to the system control circuit 20 and the like.

In the synchronous mode, the switch 43 is connected to the contact e side. Then, the external synchronization signal input through the external synchronization signal input terminal 45 is supplied to the input terminal 42i of the synchronization signal generation circuit 42. Then, various timing signals phase-locked (locked) with the external synchronizing signal are obtained from the synchronizing signal generating circuit 42, and various timing signals are appropriately supplied to the system control circuit 20 and the like.

The synchronizing signal generating circuit 42 of this example is provided with a branch output terminal 42b which is substantially directly connected to the input terminal 42i as shown by a broken line, and the synchronizing signal output terminal 46 is connected to this terminal 42b. . In addition, the system control circuit 20
Similarly, the input terminal 20i and the branch output terminal 20b substantially directly connected to the input terminal 20i are also provided, and are connected to the input terminal 47 and the output terminal 48 of the external control signal, respectively.

The switch 43 can be manually switched, but the input terminal 45 for the external synchronizing signal is formed by a jack, and when a plug is inserted into this jack, this is detected mechanically or electrically. However, the switch 43 can be automatically switched to the contact e side by the detection output.

[Synchronous operation of recording / reproducing apparatus] Next, referring to FIG.
With reference to FIG. 9, the synchronous operation of the already proposed recording device and reproducing device will be described.

In this example, a 2-channel stereo audio / voice data compression / expansion type magneto-optical disk recording / reproducing apparatus is used.
By connecting as many channels as the number of channels, two channels are recorded on each disk, but a large number of channels are synchronously recorded. As a synchronous recording method, signals of respective channels sampled at the same timing are recorded at the same recording position on the disc.

During reproduction, the above-mentioned plurality of discs are
Since the multi-channel signals are recorded at the same recording positions as described above, the signals at the same recording positions are written at the same address in the buffer memory for digital signal processing. With this arrangement, multi-channel data can be easily read by reading multi-channel data from a plurality of memories in synchronization with specifying the same address.

In FIG. 7, reference numeral 50 is a master control circuit. The master control circuit 50 controls the sync signal SY and control signals such as a recording start command, a stop command, a reproduction start command, and a recording and reproduction position control signal (hereinafter referred to as a command)
CMs are generated from output terminals 51 and 52, respectively.

Reference numerals 100 and 200 respectively denote the above-mentioned magneto-optical disk recording / reproducing device, and both recording / reproducing devices 10
In 0 and 200, the parts corresponding to the above-mentioned example of FIG.
Further, in the example of FIG. 7, the recording / reproducing devices 100, 200
The recording signal processing system and the reproduction signal processing system of FIG.
And 270.

The sync signal output terminal 51 of the master control circuit 50 is the sync signal input terminal 1 of the recording / reproducing apparatus 100.
45, and the control signal output terminal 52 is connected to the external control signal input terminal 147 of the recording / reproducing apparatus 100.
Further, the output terminal 146 of the recording / reproducing apparatus 100 and the input terminal 245 of the external synchronizing signal of the recording / reproducing apparatus 200 are connected, and the output terminal 148 of the recording / reproducing apparatus 100 and the input terminal of the external control signal of the recording / reproducing apparatus 200. 247 is connected.

The switches 143 and 243 are
Manually or as described above, input terminals 145, 2
When 45 is connected to an external device, it is automatically switched to the contact e side, and both the first and second recording / reproducing devices are set to the synchronous mode.

Since the connection is made as described above, the synchronization signal SY from the master control circuit 50 and the command CM are
The external sync signal and the external control signal are supplied to the sync signal input terminal 145 and the command input terminal 147 of the first recording / reproducing apparatus 100, respectively. Then, the synchronization signal SY and the command CM are transmitted to the first recording / reproducing apparatus 10
Not only 0, but also the second recording / reproducing apparatus 200 is supplied via the first recording / reproducing apparatus 100.

Although illustration is omitted, when the third, fourth, ..., Nth ...
1) output terminals 46 and 48 of the recording / reproducing apparatus, and
When the input terminals 45 and 47 of the recording / reproducing apparatus are connected to each other, the synchronization signal SY and the command CM from the master control circuit 50 are sequentially supplied to the n-th recording / reproducing apparatus.

As described above, in the synchronous mode, the switches 143 to 244 of both recording / reproducing devices 100 and 200 are connected to the contact e side, and both recording / reproducing devices 100 and 20 are connected.
The synchronization signal SY is supplied to the PLLs 142 and 242 of 0 at the same time, and the system control circuits 120 and 220:
The command CM is supplied together.

Then, from the synchronizing signal generating circuits 142 and 242 of the recording / reproducing apparatuses 100 and 200, various timing signals phase-locked (locked) with the common synchronizing signal SY, respectively, are supplied to the system control circuits 120 and 220, respectively.
And so on.

As a result, the A / D converters 122 and 22 are
The sampling timing in 2 matches. Further, the rotation phases of the motors 130M and 230M controlled via the servo circuits 132 and 232 match, and the disks 101 and 201 rotate in synchronization.

On the other hand, each system control circuit 120, 220
Sends back the address (absolute address) information of the disks 101, 201 currently scanned by the optical heads 130, 230 to the master control circuit 50. As a result, the master control circuit 50 can manage the addresses of the plurality of discs 101 and 201, and control the data recording or reproducing position on each disc 101, 201 using the command CM which is an external command. It becomes possible to do.

At the time of recording, as shown in FIG.
A / D converters 122 and 2 of the recording / reproducing devices 100 and 200
At 22, the four channels of audio data sampled at the same time t0, t1, t2, ... Are transferred to the same addresses A0, A1, A2 ,. Channels are distributed and recorded.

At the time of reproduction, as shown in FIG. 9, the audio data of each two channels reproduced from the same address A0, A1, A2, ... , 225 of the same address B0, B1, B2 ,.

From the buffer memories 125 and 225, at the times t0, t1, t2, ... At the same addresses B0, B1, B.
2 ... The sample data of ... is read at the same timing, and the original 4-channel audio data is reproduced in synchronization.

As described above, in this example, the sound data is greatly compressed / decompressed during recording / reproduction,
Since writing of data to the disk and reading of data from the disk are both performed intermittently,
It becomes easy to match the addresses of a plurality of disks.

The addresses of the discs 101 and 201 on which the audio data is recorded are not necessarily the same, but may have a certain relation with each other.

Further, at the time of the synchronous operation, by operating any one of the plurality of recording / reproducing devices, for example, the recording operation key of the first recording / reproducing device (see FIG. 6), all the recording / reproducing devices perform the recording operation. To be controlled.

As described above in detail, in the example of FIG. 7, the signal timings of a plurality of consumer disc recording / reproducing devices are synchronized to rotate the plurality of discs synchronously.
At the time of recording, multi-channel audio data at the same time point is divided into two channels and recorded at the same address on a plurality of discs, and at the time of reproduction, audio data of each two channels reproduced from the same address on a plurality of discs is recorded. Since the signals are simultaneously output via the memory, digital recording / reproduction of multi-channel audio can be easily performed at a relatively low price.

However, in the previously proposed recording and reproducing apparatus as shown in FIG. 7, from the master control circuit 50, the first, second ...
Frequency fSY of external synchronization signal SY supplied to 00 ...
Is equal to or half the crystal oscillation frequency of the reproduction system clock, and is, for example, fSY = 384 × 44.1 kHz = 16,934.4 kHz
It has a relatively high frequency like z 1.

Such a high frequency signal is generally
Since the wires are distributed through the coaxial line, the cost of the wire rod and the connector is high, and in order to send the synchronization signal SY to the low impedance coaxial line at a sufficiently high level, a drive amplifier with a relatively large output is required. Moreover, there is a problem that the cost increases.

In view of the above point, an object of the present invention is to record and reproduce a multi-channel digital recording / reproducing apparatus by synchronously operating a plurality of consumer digital recording / reproducing apparatuses at a low cost. Is in the place of providing.

[0079]

In order to solve the above-mentioned problems, the recording apparatus according to the first aspect of the present invention makes the absolute address information pre-recorded on the medium correspond to the reference numerals of the embodiments described later. Based on this, the recording apparatus 10 including the position control means 181 for controlling the recording position of information on this medium.
In L, the position information generating means 182 for generating position information at a predetermined interval based on the absolute address information, the position information generated by this position information generating means, and the position information Sadrs from the outside are given from the outside. Comparison means 11L, 1 for comparing at a predetermined time point based on the reference time information SY of the cycle Ts.
83 is provided, and the error information obtained from the comparison means is fed back to the position control means so that the recording position on the medium is synchronized with the position information from the outside.

The recording apparatus according to the second invention is
Corresponding reference numerals in the examples described below, based on the absolute address information pre-recorded on the medium, in the recording apparatus including the position control means 171 for controlling the recording position of the information on the medium, Position information generating means 172 for generating position information at predetermined intervals based on absolute address information, and time information generating means 174, 175 for generating reference time information SY of a predetermined cycle Ts are provided, and the reference time information is externally provided. In addition to the derivation, the position information generated by the position information generating means is derived to the outside at a predetermined time based on the reference time information.

Then, the reproducing apparatus according to the third aspect of the present invention reproduces the information on the medium based on the absolute address information recorded in advance on the medium when the reference numerals of the later-described embodiments are associated. In the reproducing device 10L provided with the position control means 181 for controlling the position, the position information generating means 1 for generating the position information at a predetermined interval based on the absolute address information.
82, and comparing means 11L, 183 for comparing the position information generated by this position information generating means and the position information Sadrs from the outside at a predetermined time based on the reference time information SY of a predetermined cycle Ts from the outside. The error information obtained from the comparison means is fed back to the position control means so that the reproduction position on the medium is synchronized with the position information from the outside.

Further, the reproducing apparatus according to the fourth invention is
Corresponding reference numerals in the embodiments described later correspond to a reproducing apparatus equipped with position control means 171 for controlling the reproducing position of information on the medium based on absolute address information recorded in advance on the medium, Position information generating means 172 for generating position information at predetermined intervals based on absolute address information, and time information generating means 174, 175 for generating reference time information SY of a predetermined cycle Ts are provided, and the reference time information is externally provided. In addition to the derivation, the position information generated by the position information generating means is derived to the outside at a predetermined time based on the reference time information.

[0083]

In the recording apparatus according to the first aspect of the invention and the reproducing apparatus according to the third aspect of the invention having such a configuration, the internal position information and the external location information are obtained based on the reference time information SY having a predetermined cycle Ts transmitted from the outside. The position information Sadrs from is compared at the same time point, and the obtained error information is fed back to control the recording position or the reproducing position on the medium so as to be synchronized with the position information from the outside. The synchronous operation of the recording device or the reproducing device becomes possible. Moreover, since the cycle Ts of the reference time information SY transmitted from the outside is long, it is possible to use a low-cost transmission line.

Further, in the recording apparatus according to the second aspect of the present invention and the reproducing apparatus according to the fourth aspect of the present invention having such a configuration, the reference time information SY of the predetermined period Ts and the position of the predetermined time point based on the reference time information SY. By deriving the information to the outside, when the recording apparatus according to the first aspect of the present invention and the reproducing apparatus according to the third aspect of the present invention are operated in synchronization with each other, the operation as a standard apparatus becomes possible. . Further, since the cycle Ts of the reference time information SY is long, it is possible to use a low cost transmission system.

[0085]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the recording apparatus and the reproducing apparatus according to the present invention are applied to an audio data compression / expansion type magneto-optical disk recording / reproducing apparatus will be described below with reference to FIGS.

In this embodiment, it is noted that the mini-disk recording / reproducing apparatus is provided with the wired transmission line for remote control as described above, and a plurality of two-channel recording is performed through this transmission line. Control information for synchronous operation is transmitted and received between the reproducing devices.

FIG. 2 shows the overall construction of an embodiment of the present invention, and FIG. 1 shows the construction of the essential parts. In both of these figures, the portions corresponding to those in the above-mentioned FIG.

In FIG. 2, 10A to 10M are 2-channel recording / reproducing devices each using a mini disk as a medium, and each of the devices 10A to 10M originally has terminals 13c and 13d for wired remote control. Through the transmission line 14.

One specific device, for example, 10M is set as the master (reference) device, and the other devices 10A to
10L is a slave (slave) device, and for each slave device 10A to 10L, a synchronization signal and a synchronization information S, which will be described later, for synchronous operation from the master device 10M.
Y and Sadrs are commonly supplied and the number of channels is 2M
, A multi-channel recording / reproducing system is constructed.

In this embodiment, each device 10A-1
One of the 0M control terminals 13c is connected to the CPU 11A-
The synchronization information Sadrs is transmitted / received by being connected to 11M, and the other control terminal 13d is used for transmission / reception of the synchronization signal SY. In addition, required DC power is supplied to each of the devices 10A to 10M from an external power supply (not shown).
The other structure is the same as that shown in FIG.

The master device 10M and the slave device 10L shown in FIG. 2 are configured as shown in FIG. In FIG. 1, the recording / reproducing position control circuits 171 and 181 of the master device 10M and the slave device 10L include an RF signal processing circuit 31, a servo control circuit 32, and an absolute address decoding circuit 34 as shown in FIG. As described above, the absolute address information extracted from the RF signal during recording or reproduction is included in the system control circuit (CP).
U) supplied to 11M, 11L, the discs 1M, 1L
The above recording position or reproducing position, in other words, the position scanned by the optical head is recognized and the position is controlled.

In this embodiment, on the master device 10M side, the absolute address information from the position control circuit 171 is supplied to the address ID counter 172, and this counter 172 is supplied.
3 is supplied to the sampling register 173, and the output of the crystal control timing signal generation circuit 174 is appropriately frequency-divided through the frequency division circuit 175.
A synchronization signal SY as shown in A is formed, and this synchronization signal SY is supplied to the sampling register 173.

In this register 173, the synchronization signal S
At the timing of Y, the sampled address ID is supplied to the system control circuit 11M to generate synchronization information Sadrs as shown in FIG. 3B, and together with the synchronization signal SY formed in the frequency dividing circuit 175, the control terminal 13c, 1
It is led out to the transmission line 14 through 3d.

The frequency dividing circuit 175, as described later,
The timing signal generating circuit 17 is provided to explain that the repetition frequency of the synchronization signal SY is low.
If you get the required frequency and precision from 4,
The frequency divider circuit 175 can be omitted.

On the other hand, on the slave device 10L side,
The synchronization information Sadrs from the master device 10M side is supplied to the system control circuit 11L from the transmission line 14 through the control terminals 13c and 13d, and the synchronization signal SY is supplied to the sampling register 183. Also, like the master device 10M side, the absolute address information from the position control circuit 181 is supplied to the address ID counter 182, and the output of this counter 182 is supplied to the register 183. Then, in this register 183, the master device 10M
At the timing of the synchronization signal SY from the side, the sampled address ID is supplied to the system control circuit 11L and compared with the synchronization information Sadrs from the master device 10M side, and this comparison output is used as a control signal as the position control circuit. 1
Returned to 81.

Next, referring to FIG. 3 as well, the synchronous operation of one embodiment of the present invention will be described. In this embodiment, as described above, the timing signal generating circuit 174 and the frequency dividing circuit 175 of the master device 10M are used to generate the signal shown in FIG.
A synchronization signal SY as shown in A is formed. This synchronizing signal SY is set, for example, by repeatedly dividing the output of the crystal oscillator having a high frequency of about 17 MHz as described above, so that the repetition period Ts is set to, for example, Ts = 20 milliseconds. , The rising edge resolution, which is the criterion for synchronization, is secured with the required high accuracy.

An ID is given to each of the edges, and the synchronization ID is used as synchronization information Sadrs together with the address ID as shown in FIG. 10
Is transmitted to L.

In this embodiment, the address ID is a spatial measure of required accuracy based on the absolute address information of the disc as described above, and corresponds to, for example, a cluster or sector of the disc. When the disk is driven at a constant linear velocity, the address ID also serves as a time scale, but as is clear from the above, the cycle of the address ID is set sufficiently shorter than the repetition cycle Ts of the synchronization signal. To be done.

In the slave device 10L, its own register 183 compares the sampled address ID with the address ID in the synchronization information Sadrs from the master device 10M side by the CPU 11L.
In both registers 173 and 183, the master device 10M
Since the sampling is performed at the timing of the synchronization signal SY formed on the side, the CPU 11 of the slave device 10L
For L, the error information of the delay or advance of the address ID on the slave device 10L side based on the address ID of the master device 10M is obtained.

Then, this error information is fed back to the recording / reproducing position control circuit 181, so that the error becomes zero.
The scanning position of the disk 1L by the optical head (not shown) is controlled. As a result, the disk 1L on the slave device 10L side is scanned in phase synchronization with the disk 1M on the master device 10M side.

In this embodiment, in the case of synchronous operation, the disturbance on the slave side is brought about by the slight frequency difference between the crystal oscillators on the master side and the slave side, so the disturbance information to be given to the feedback system on the slave side is It is mostly DC and does not require high frequency rates.

Therefore, the repetition frequency f of the synchronization signal SY is
For example, even if the sy can be set to a significantly low value of about 50 Hz, and the edge is made steep to some extent, the band of the transmission line is, for example, about the audio frequency, and the wire for remote control is used. It is possible to exchange information for synchronous operation through the transmission line of the formula.

Then, the conventional inconveniences such as the need for high-cost wire rods, connectors, and high-power drive amplifiers due to the high frequency of the synchronizing signal are solved,
A plurality of consumer digital recording / reproducing devices can be synchronously operated at low cost to perform multi-channel recording / reproducing.

Next, another embodiment of the multi-channel recording / reproducing apparatus according to the present invention will be described with reference to FIG.

FIG. 4 shows the configuration of the main part of another embodiment of the present invention.
Shown in In FIG. 4, parts corresponding to those in FIG. 2 are given the same reference numerals and duplicate explanations are omitted.

In FIG. 4, 10MX is a master-dedicated device, and has a configuration different from that of the slave devices 10a to 10l as in the previously proposed example of FIG. That is, the master dedicated device 10MX of this embodiment does not have a recording / reproducing function, as is apparent from FIG. 4, and instead of the recording / reproducing position control circuit 171 and the address ID counter 172 of the embodiment of FIG. , A pseudo address ID generation circuit 176 is provided.

In the generating circuit 176, the address ID of the proper cycle as described above is generated in synchronization with the reference signal of the predetermined cycle supplied from the timing signal generating circuit 174 and is supplied to the sampling register 173. Address ID sampled in this register 173
Is supplied to the system control circuit 11M, synchronization information Sadrs as shown in FIG. 3B is generated, and is guided to the transmission line 14 through the control terminal 13c. Master dedicated device 10
The rest of the configuration of the MX is similar to that of the master device 10M shown in FIG.

On the other hand, on the side of each of the slave devices 10A to 10L, the disk 1A is based on the synchronization information Sadrs transmitted from the master dedicated device 10MX, as in the above-described embodiment.
The scanning position of 1 L is controlled. As a result, the disk 1L on the slave device 10L side is scanned in phase synchronization with the disk 1M on the master device 10M side.

Then, in this embodiment, the address information from each of the slave devices 10A to 10L is sent back to the master dedicated device 10MX as in the previously proposed example of FIG.
As a result, the master-dedicated device 10MX can manage the addresses of the disks 1A to 1L of the slave devices 10A to 10L, and can control the recording or reproducing positions on the disks 1A to 1L. .

In the embodiment of FIG. 4, since recording / reproducing is possible only in each of the slave devices 10A to 10L, a multi-channel recording / reproducing system having 2M-2 channels is constructed.

Also in the embodiment of FIG. 4, as in the embodiment of FIG. 1, the synchronization information (disturbance information) from the master device side is
Since it is given to the slave device side at a low frequency rate, the conventional inconvenience caused by the high frequency of the synchronization signal is solved, and a plurality of consumer digital recording / reproducing devices are synchronously operated at low cost. Multi-channel recording / playback can be performed.

As is apparent from FIG. 3, in both of the above embodiments, the synchronization information Sadrs is transmitted only during the period when the synchronization signal SY is "H", so that the synchronization signal SY is "L". During the period, the operating state and the like can be displayed on the display of the device by using the information for remote control which originally flows in the diverted wired transmission line.

[0113]

As described above, according to the present invention, in the recording device or the reproducing device for controlling the recording position or the reproducing position based on the absolute address information recorded in advance on the medium, On the slave side, position information at a predetermined interval is generated based on the absolute address information, and this position information and position information from the outside are compared at a predetermined time based on reference time information from a predetermined period from the outside to obtain the position information. Based on the error information that is obtained, while synchronizing the recording position or the reproduction position on the medium with the position information from the outside, on the master side, based on the absolute address information, the position information at a predetermined interval is generated, Since the reference time information of a predetermined cycle is generated and derived to the outside, and the position information is derived to the outside at a predetermined time point based on this reference time information, the plurality of recording devices or reproducing devices can be operated. For the period operation, it can be transmitted for wired remote control, by using the low-cost line, and the reference time information and the position information at a predetermined time.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of an embodiment of a recording device and a reproducing device according to the present invention.

FIG. 2 is a block diagram showing a configuration of a main part of an embodiment of the present invention.

FIG. 3 is a time chart for explaining the operation of the embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a main part of another embodiment of the present invention.

FIG. 5 is a block diagram for explaining the present invention.

FIG. 6 is a block diagram for explaining the present invention.

FIG. 7 is a block diagram showing a configuration example of a conventional recording device and reproducing device.

FIG. 8 is a conceptual diagram for explaining a recording operation of a conventional example.

FIG. 9 is a conceptual diagram for explaining a reproducing operation of a conventional example.

[Explanation of symbols]

 1A to 1M Magneto-optical disk 10A to 10M Disk recording / reproducing device 10MX Master dedicated device 11A to 11M System control circuit 13c, 13d Control terminal 14 Transmission line 171,181 Recording / reproducing position control circuit 172,182 Address ID counter 173,183 Sampling -Registers 174, 184 Timing signal generation circuit 175 Frequency division circuit 176 Pseudo address ID generation circuit Sadrs Synchronization information SY Synchronization signal

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location G11B 20/10 321 Z 7736-5D

Claims (6)

[Claims] 1. A recording apparatus comprising position control means for controlling a recording position of information on a medium based on absolute address information recorded in advance on the medium, based on the absolute address information. Position information generating means for generating position information at a predetermined interval, and position information generated by this position information generating means and position information from the outside are compared at a predetermined time point based on reference time information from the outside at a predetermined cycle. A recording means characterized in that a comparison means is provided, and the error information obtained from the comparison means is fed back to the position control means so that the recording position on the medium is synchronized with the position information from the outside. apparatus. 2. A recording apparatus comprising position control means for controlling the recording position of information on the medium based on absolute address information recorded in advance on the medium, based on the absolute address information. Position information generating means for generating position information at a predetermined interval and time information generating means for generating reference time information of a predetermined cycle are provided, and the reference time information is derived to the outside and generated by the position information generating means. The recording device is characterized in that the position information is derived outside at a predetermined time based on the reference time information. 3. The recording apparatus according to claim 1, wherein remote control by wire is possible, and the reference time information and the position information are transmitted by wire. 4. A reproducing apparatus equipped with position control means for controlling the reproduction position of information on the medium based on absolute address information pre-recorded on the medium, based on the absolute address information. Position information generating means for generating position information at a predetermined interval, and position information generated by this position information generating means and position information from the outside are compared at a predetermined time point based on reference time information from the outside at a predetermined cycle. A reproducing means characterized in that a comparing means is provided, and error information obtained from the comparing means is fed back to the position controlling means so that a reproducing position on the medium is synchronized with the external position information. apparatus. 5. A reproducing apparatus equipped with position control means for controlling a reproduction position of information on the medium based on absolute address information recorded in advance on the medium, based on the absolute address information. Position information generating means for generating position information at a predetermined interval and time information generating means for generating reference time information of a predetermined cycle are provided, and the reference time information is derived to the outside and generated by the position information generating means. The reproducing apparatus is characterized in that the position information is derived to the outside at a predetermined time based on the reference time information. 6. The reproducing apparatus according to claim 4 or 5, wherein remote control by wire is possible, and the reference time information and the position information are transmitted by wire.